Copy stable/8 to releng/8.1 in preparation for 8.1-RC1.

[FreeBSD/releng/8.1.git] / sys / cddl / contrib / opensolaris / uts / common / sys / dtrace.h

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_DTRACE_H
#define _SYS_DTRACE_H

#pragma ident   "%Z%%M% %I%     %E% SMI"

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * DTrace Dynamic Tracing Software: Kernel Interfaces
 *
 * Note: The contents of this file are private to the implementation of the
 * Solaris system and DTrace subsystem and are subject to change at any time
 * without notice.  Applications and drivers using these interfaces will fail
 * to run on future releases.  These interfaces should not be used for any
 * purpose except those expressly outlined in dtrace(7D) and libdtrace(3LIB).
 * Please refer to the "Solaris Dynamic Tracing Guide" for more information.
 */

#ifndef _ASM

#include <sys/types.h>
#include <sys/modctl.h>
#include <sys/processor.h>
#if defined(sun)
#include <sys/systm.h>
#else
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/ioccom.h>
#include <sys/ucred.h>
typedef int model_t;
#endif
#include <sys/ctf_api.h>
#include <sys/cyclic.h>
#if defined(sun)
#include <sys/int_limits.h>
#else
#include <sys/stdint.h>
#endif

/*
 * DTrace Universal Constants and Typedefs
 */
#define DTRACE_CPUALL           -1      /* all CPUs */
#define DTRACE_IDNONE           0       /* invalid probe identifier */
#define DTRACE_EPIDNONE         0       /* invalid enabled probe identifier */
#define DTRACE_AGGIDNONE        0       /* invalid aggregation identifier */
#define DTRACE_AGGVARIDNONE     0       /* invalid aggregation variable ID */
#define DTRACE_CACHEIDNONE      0       /* invalid predicate cache */
#define DTRACE_PROVNONE         0       /* invalid provider identifier */
#define DTRACE_METAPROVNONE     0       /* invalid meta-provider identifier */
#define DTRACE_ARGNONE          -1      /* invalid argument index */

#define DTRACE_PROVNAMELEN      64
#define DTRACE_MODNAMELEN       64
#define DTRACE_FUNCNAMELEN      128
#define DTRACE_NAMELEN          64
#define DTRACE_FULLNAMELEN      (DTRACE_PROVNAMELEN + DTRACE_MODNAMELEN + \
                                DTRACE_FUNCNAMELEN + DTRACE_NAMELEN + 4)
#define DTRACE_ARGTYPELEN       128

typedef uint32_t dtrace_id_t;           /* probe identifier */
typedef uint32_t dtrace_epid_t;         /* enabled probe identifier */
typedef uint32_t dtrace_aggid_t;        /* aggregation identifier */
typedef int64_t dtrace_aggvarid_t;      /* aggregation variable identifier */
typedef uint16_t dtrace_actkind_t;      /* action kind */
typedef int64_t dtrace_optval_t;        /* option value */
typedef uint32_t dtrace_cacheid_t;      /* predicate cache identifier */

typedef enum dtrace_probespec {
        DTRACE_PROBESPEC_NONE = -1,
        DTRACE_PROBESPEC_PROVIDER = 0,
        DTRACE_PROBESPEC_MOD,
        DTRACE_PROBESPEC_FUNC,
        DTRACE_PROBESPEC_NAME
} dtrace_probespec_t;

/*
 * DTrace Intermediate Format (DIF)
 *
 * The following definitions describe the DTrace Intermediate Format (DIF), a
 * a RISC-like instruction set and program encoding used to represent
 * predicates and actions that can be bound to DTrace probes.  The constants
 * below defining the number of available registers are suggested minimums; the
 * compiler should use DTRACEIOC_CONF to dynamically obtain the number of
 * registers provided by the current DTrace implementation.
 */
#define DIF_VERSION_1   1               /* DIF version 1: Solaris 10 Beta */
#define DIF_VERSION_2   2               /* DIF version 2: Solaris 10 FCS */
#define DIF_VERSION     DIF_VERSION_2   /* latest DIF instruction set version */
#define DIF_DIR_NREGS   8               /* number of DIF integer registers */
#define DIF_DTR_NREGS   8               /* number of DIF tuple registers */

#define DIF_OP_OR       1               /* or   r1, r2, rd */
#define DIF_OP_XOR      2               /* xor  r1, r2, rd */
#define DIF_OP_AND      3               /* and  r1, r2, rd */
#define DIF_OP_SLL      4               /* sll  r1, r2, rd */
#define DIF_OP_SRL      5               /* srl  r1, r2, rd */
#define DIF_OP_SUB      6               /* sub  r1, r2, rd */
#define DIF_OP_ADD      7               /* add  r1, r2, rd */
#define DIF_OP_MUL      8               /* mul  r1, r2, rd */
#define DIF_OP_SDIV     9               /* sdiv r1, r2, rd */
#define DIF_OP_UDIV     10              /* udiv r1, r2, rd */
#define DIF_OP_SREM     11              /* srem r1, r2, rd */
#define DIF_OP_UREM     12              /* urem r1, r2, rd */
#define DIF_OP_NOT      13              /* not  r1, rd */
#define DIF_OP_MOV      14              /* mov  r1, rd */
#define DIF_OP_CMP      15              /* cmp  r1, r2 */
#define DIF_OP_TST      16              /* tst  r1 */
#define DIF_OP_BA       17              /* ba   label */
#define DIF_OP_BE       18              /* be   label */
#define DIF_OP_BNE      19              /* bne  label */
#define DIF_OP_BG       20              /* bg   label */
#define DIF_OP_BGU      21              /* bgu  label */
#define DIF_OP_BGE      22              /* bge  label */
#define DIF_OP_BGEU     23              /* bgeu label */
#define DIF_OP_BL       24              /* bl   label */
#define DIF_OP_BLU      25              /* blu  label */
#define DIF_OP_BLE      26              /* ble  label */
#define DIF_OP_BLEU     27              /* bleu label */
#define DIF_OP_LDSB     28              /* ldsb [r1], rd */
#define DIF_OP_LDSH     29              /* ldsh [r1], rd */
#define DIF_OP_LDSW     30              /* ldsw [r1], rd */
#define DIF_OP_LDUB     31              /* ldub [r1], rd */
#define DIF_OP_LDUH     32              /* lduh [r1], rd */
#define DIF_OP_LDUW     33              /* lduw [r1], rd */
#define DIF_OP_LDX      34              /* ldx  [r1], rd */
#define DIF_OP_RET      35              /* ret  rd */
#define DIF_OP_NOP      36              /* nop */
#define DIF_OP_SETX     37              /* setx intindex, rd */
#define DIF_OP_SETS     38              /* sets strindex, rd */
#define DIF_OP_SCMP     39              /* scmp r1, r2 */
#define DIF_OP_LDGA     40              /* ldga var, ri, rd */
#define DIF_OP_LDGS     41              /* ldgs var, rd */
#define DIF_OP_STGS     42              /* stgs var, rs */
#define DIF_OP_LDTA     43              /* ldta var, ri, rd */
#define DIF_OP_LDTS     44              /* ldts var, rd */
#define DIF_OP_STTS     45              /* stts var, rs */
#define DIF_OP_SRA      46              /* sra  r1, r2, rd */
#define DIF_OP_CALL     47              /* call subr, rd */
#define DIF_OP_PUSHTR   48              /* pushtr type, rs, rr */
#define DIF_OP_PUSHTV   49              /* pushtv type, rs, rv */
#define DIF_OP_POPTS    50              /* popts */
#define DIF_OP_FLUSHTS  51              /* flushts */
#define DIF_OP_LDGAA    52              /* ldgaa var, rd */
#define DIF_OP_LDTAA    53              /* ldtaa var, rd */
#define DIF_OP_STGAA    54              /* stgaa var, rs */
#define DIF_OP_STTAA    55              /* sttaa var, rs */
#define DIF_OP_LDLS     56              /* ldls var, rd */
#define DIF_OP_STLS     57              /* stls var, rs */
#define DIF_OP_ALLOCS   58              /* allocs r1, rd */
#define DIF_OP_COPYS    59              /* copys  r1, r2, rd */
#define DIF_OP_STB      60              /* stb  r1, [rd] */
#define DIF_OP_STH      61              /* sth  r1, [rd] */
#define DIF_OP_STW      62              /* stw  r1, [rd] */
#define DIF_OP_STX      63              /* stx  r1, [rd] */
#define DIF_OP_ULDSB    64              /* uldsb [r1], rd */
#define DIF_OP_ULDSH    65              /* uldsh [r1], rd */
#define DIF_OP_ULDSW    66              /* uldsw [r1], rd */
#define DIF_OP_ULDUB    67              /* uldub [r1], rd */
#define DIF_OP_ULDUH    68              /* ulduh [r1], rd */
#define DIF_OP_ULDUW    69              /* ulduw [r1], rd */
#define DIF_OP_ULDX     70              /* uldx  [r1], rd */
#define DIF_OP_RLDSB    71              /* rldsb [r1], rd */
#define DIF_OP_RLDSH    72              /* rldsh [r1], rd */
#define DIF_OP_RLDSW    73              /* rldsw [r1], rd */
#define DIF_OP_RLDUB    74              /* rldub [r1], rd */
#define DIF_OP_RLDUH    75              /* rlduh [r1], rd */
#define DIF_OP_RLDUW    76              /* rlduw [r1], rd */
#define DIF_OP_RLDX     77              /* rldx  [r1], rd */
#define DIF_OP_XLATE    78              /* xlate xlrindex, rd */
#define DIF_OP_XLARG    79              /* xlarg xlrindex, rd */

#define DIF_INTOFF_MAX          0xffff  /* highest integer table offset */
#define DIF_STROFF_MAX          0xffff  /* highest string table offset */
#define DIF_REGISTER_MAX        0xff    /* highest register number */
#define DIF_VARIABLE_MAX        0xffff  /* highest variable identifier */
#define DIF_SUBROUTINE_MAX      0xffff  /* highest subroutine code */

#define DIF_VAR_ARRAY_MIN       0x0000  /* lowest numbered array variable */
#define DIF_VAR_ARRAY_UBASE     0x0080  /* lowest user-defined array */
#define DIF_VAR_ARRAY_MAX       0x00ff  /* highest numbered array variable */

#define DIF_VAR_OTHER_MIN       0x0100  /* lowest numbered scalar or assc */
#define DIF_VAR_OTHER_UBASE     0x0500  /* lowest user-defined scalar or assc */
#define DIF_VAR_OTHER_MAX       0xffff  /* highest numbered scalar or assc */

#define DIF_VAR_ARGS            0x0000  /* arguments array */
#define DIF_VAR_REGS            0x0001  /* registers array */
#define DIF_VAR_UREGS           0x0002  /* user registers array */
#define DIF_VAR_CURTHREAD       0x0100  /* thread pointer */
#define DIF_VAR_TIMESTAMP       0x0101  /* timestamp */
#define DIF_VAR_VTIMESTAMP      0x0102  /* virtual timestamp */
#define DIF_VAR_IPL             0x0103  /* interrupt priority level */
#define DIF_VAR_EPID            0x0104  /* enabled probe ID */
#define DIF_VAR_ID              0x0105  /* probe ID */
#define DIF_VAR_ARG0            0x0106  /* first argument */
#define DIF_VAR_ARG1            0x0107  /* second argument */
#define DIF_VAR_ARG2            0x0108  /* third argument */
#define DIF_VAR_ARG3            0x0109  /* fourth argument */
#define DIF_VAR_ARG4            0x010a  /* fifth argument */
#define DIF_VAR_ARG5            0x010b  /* sixth argument */
#define DIF_VAR_ARG6            0x010c  /* seventh argument */
#define DIF_VAR_ARG7            0x010d  /* eighth argument */
#define DIF_VAR_ARG8            0x010e  /* ninth argument */
#define DIF_VAR_ARG9            0x010f  /* tenth argument */
#define DIF_VAR_STACKDEPTH      0x0110  /* stack depth */
#define DIF_VAR_CALLER          0x0111  /* caller */
#define DIF_VAR_PROBEPROV       0x0112  /* probe provider */
#define DIF_VAR_PROBEMOD        0x0113  /* probe module */
#define DIF_VAR_PROBEFUNC       0x0114  /* probe function */
#define DIF_VAR_PROBENAME       0x0115  /* probe name */
#define DIF_VAR_PID             0x0116  /* process ID */
#define DIF_VAR_TID             0x0117  /* (per-process) thread ID */
#define DIF_VAR_EXECNAME        0x0118  /* name of executable */
#define DIF_VAR_ZONENAME        0x0119  /* zone name associated with process */
#define DIF_VAR_WALLTIMESTAMP   0x011a  /* wall-clock timestamp */
#define DIF_VAR_USTACKDEPTH     0x011b  /* user-land stack depth */
#define DIF_VAR_UCALLER         0x011c  /* user-level caller */
#define DIF_VAR_PPID            0x011d  /* parent process ID */
#define DIF_VAR_UID             0x011e  /* process user ID */
#define DIF_VAR_GID             0x011f  /* process group ID */
#define DIF_VAR_ERRNO           0x0120  /* thread errno */
#define DIF_VAR_EXECARGS        0x0121  /* process arguments */

#define DIF_SUBR_RAND                   0
#define DIF_SUBR_MUTEX_OWNED            1
#define DIF_SUBR_MUTEX_OWNER            2
#define DIF_SUBR_MUTEX_TYPE_ADAPTIVE    3
#define DIF_SUBR_MUTEX_TYPE_SPIN        4
#define DIF_SUBR_RW_READ_HELD           5
#define DIF_SUBR_RW_WRITE_HELD          6
#define DIF_SUBR_RW_ISWRITER            7
#define DIF_SUBR_COPYIN                 8
#define DIF_SUBR_COPYINSTR              9
#define DIF_SUBR_SPECULATION            10
#define DIF_SUBR_PROGENYOF              11
#define DIF_SUBR_STRLEN                 12
#define DIF_SUBR_COPYOUT                13
#define DIF_SUBR_COPYOUTSTR             14
#define DIF_SUBR_ALLOCA                 15
#define DIF_SUBR_BCOPY                  16
#define DIF_SUBR_COPYINTO               17
#define DIF_SUBR_MSGDSIZE               18
#define DIF_SUBR_MSGSIZE                19
#define DIF_SUBR_GETMAJOR               20
#define DIF_SUBR_GETMINOR               21
#define DIF_SUBR_DDI_PATHNAME           22
#define DIF_SUBR_STRJOIN                23
#define DIF_SUBR_LLTOSTR                24
#define DIF_SUBR_BASENAME               25
#define DIF_SUBR_DIRNAME                26
#define DIF_SUBR_CLEANPATH              27
#define DIF_SUBR_STRCHR                 28
#define DIF_SUBR_STRRCHR                29
#define DIF_SUBR_STRSTR                 30
#define DIF_SUBR_STRTOK                 31
#define DIF_SUBR_SUBSTR                 32
#define DIF_SUBR_INDEX                  33
#define DIF_SUBR_RINDEX                 34
#define DIF_SUBR_HTONS                  35
#define DIF_SUBR_HTONL                  36
#define DIF_SUBR_HTONLL                 37
#define DIF_SUBR_NTOHS                  38
#define DIF_SUBR_NTOHL                  39
#define DIF_SUBR_NTOHLL                 40
#define DIF_SUBR_INET_NTOP              41
#define DIF_SUBR_INET_NTOA              42
#define DIF_SUBR_INET_NTOA6             43
#define DIF_SUBR_MEMREF                 44
#define DIF_SUBR_TYPEREF                45
#define DIF_SUBR_SX_SHARED_HELD         46
#define DIF_SUBR_SX_EXCLUSIVE_HELD      47
#define DIF_SUBR_SX_ISEXCLUSIVE         48

#define DIF_SUBR_MAX                    48      /* max subroutine value */

typedef uint32_t dif_instr_t;

#define DIF_INSTR_OP(i)                 (((i) >> 24) & 0xff)
#define DIF_INSTR_R1(i)                 (((i) >> 16) & 0xff)
#define DIF_INSTR_R2(i)                 (((i) >>  8) & 0xff)
#define DIF_INSTR_RD(i)                 ((i) & 0xff)
#define DIF_INSTR_RS(i)                 ((i) & 0xff)
#define DIF_INSTR_LABEL(i)              ((i) & 0xffffff)
#define DIF_INSTR_VAR(i)                (((i) >>  8) & 0xffff)
#define DIF_INSTR_INTEGER(i)            (((i) >>  8) & 0xffff)
#define DIF_INSTR_STRING(i)             (((i) >>  8) & 0xffff)
#define DIF_INSTR_SUBR(i)               (((i) >>  8) & 0xffff)
#define DIF_INSTR_TYPE(i)               (((i) >> 16) & 0xff)
#define DIF_INSTR_XLREF(i)              (((i) >>  8) & 0xffff)

#define DIF_INSTR_FMT(op, r1, r2, d) \
        (((op) << 24) | ((r1) << 16) | ((r2) << 8) | (d))

#define DIF_INSTR_NOT(r1, d)            (DIF_INSTR_FMT(DIF_OP_NOT, r1, 0, d))
#define DIF_INSTR_MOV(r1, d)            (DIF_INSTR_FMT(DIF_OP_MOV, r1, 0, d))
#define DIF_INSTR_CMP(op, r1, r2)       (DIF_INSTR_FMT(op, r1, r2, 0))
#define DIF_INSTR_TST(r1)               (DIF_INSTR_FMT(DIF_OP_TST, r1, 0, 0))
#define DIF_INSTR_BRANCH(op, label)     (((op) << 24) | (label))
#define DIF_INSTR_LOAD(op, r1, d)       (DIF_INSTR_FMT(op, r1, 0, d))
#define DIF_INSTR_STORE(op, r1, d)      (DIF_INSTR_FMT(op, r1, 0, d))
#define DIF_INSTR_SETX(i, d)            ((DIF_OP_SETX << 24) | ((i) << 8) | (d))
#define DIF_INSTR_SETS(s, d)            ((DIF_OP_SETS << 24) | ((s) << 8) | (d))
#define DIF_INSTR_RET(d)                (DIF_INSTR_FMT(DIF_OP_RET, 0, 0, d))
#define DIF_INSTR_NOP                   (DIF_OP_NOP << 24)
#define DIF_INSTR_LDA(op, v, r, d)      (DIF_INSTR_FMT(op, v, r, d))
#define DIF_INSTR_LDV(op, v, d)         (((op) << 24) | ((v) << 8) | (d))
#define DIF_INSTR_STV(op, v, rs)        (((op) << 24) | ((v) << 8) | (rs))
#define DIF_INSTR_CALL(s, d)            ((DIF_OP_CALL << 24) | ((s) << 8) | (d))
#define DIF_INSTR_PUSHTS(op, t, r2, rs) (DIF_INSTR_FMT(op, t, r2, rs))
#define DIF_INSTR_POPTS                 (DIF_OP_POPTS << 24)
#define DIF_INSTR_FLUSHTS               (DIF_OP_FLUSHTS << 24)
#define DIF_INSTR_ALLOCS(r1, d)         (DIF_INSTR_FMT(DIF_OP_ALLOCS, r1, 0, d))
#define DIF_INSTR_COPYS(r1, r2, d)      (DIF_INSTR_FMT(DIF_OP_COPYS, r1, r2, d))
#define DIF_INSTR_XLATE(op, r, d)       (((op) << 24) | ((r) << 8) | (d))

#define DIF_REG_R0      0               /* %r0 is always set to zero */

/*
 * A DTrace Intermediate Format Type (DIF Type) is used to represent the types
 * of variables, function and associative array arguments, and the return type
 * for each DIF object (shown below).  It contains a description of the type,
 * its size in bytes, and a module identifier.
 */
typedef struct dtrace_diftype {
        uint8_t dtdt_kind;              /* type kind (see below) */
        uint8_t dtdt_ckind;             /* type kind in CTF */
        uint8_t dtdt_flags;             /* type flags (see below) */
        uint8_t dtdt_pad;               /* reserved for future use */
        uint32_t dtdt_size;             /* type size in bytes (unless string) */
} dtrace_diftype_t;

#define DIF_TYPE_CTF            0       /* type is a CTF type */
#define DIF_TYPE_STRING         1       /* type is a D string */

#define DIF_TF_BYREF            0x1     /* type is passed by reference */

/*
 * A DTrace Intermediate Format variable record is used to describe each of the
 * variables referenced by a given DIF object.  It contains an integer variable
 * identifier along with variable scope and properties, as shown below.  The
 * size of this structure must be sizeof (int) aligned.
 */
typedef struct dtrace_difv {
        uint32_t dtdv_name;             /* variable name index in dtdo_strtab */
        uint32_t dtdv_id;               /* variable reference identifier */
        uint8_t dtdv_kind;              /* variable kind (see below) */
        uint8_t dtdv_scope;             /* variable scope (see below) */
        uint16_t dtdv_flags;            /* variable flags (see below) */
        dtrace_diftype_t dtdv_type;     /* variable type (see above) */
} dtrace_difv_t;

#define DIFV_KIND_ARRAY         0       /* variable is an array of quantities */
#define DIFV_KIND_SCALAR        1       /* variable is a scalar quantity */

#define DIFV_SCOPE_GLOBAL       0       /* variable has global scope */
#define DIFV_SCOPE_THREAD       1       /* variable has thread scope */
#define DIFV_SCOPE_LOCAL        2       /* variable has local scope */

#define DIFV_F_REF              0x1     /* variable is referenced by DIFO */
#define DIFV_F_MOD              0x2     /* variable is written by DIFO */

/*
 * DTrace Actions
 *
 * The upper byte determines the class of the action; the low bytes determines
 * the specific action within that class.  The classes of actions are as
 * follows:
 *
 *   [ no class ]                  <= May record process- or kernel-related data
 *   DTRACEACT_PROC                <= Only records process-related data
 *   DTRACEACT_PROC_DESTRUCTIVE    <= Potentially destructive to processes
 *   DTRACEACT_KERNEL              <= Only records kernel-related data
 *   DTRACEACT_KERNEL_DESTRUCTIVE  <= Potentially destructive to the kernel
 *   DTRACEACT_SPECULATIVE         <= Speculation-related action
 *   DTRACEACT_AGGREGATION         <= Aggregating action
 */
#define DTRACEACT_NONE                  0       /* no action */
#define DTRACEACT_DIFEXPR               1       /* action is DIF expression */
#define DTRACEACT_EXIT                  2       /* exit() action */
#define DTRACEACT_PRINTF                3       /* printf() action */
#define DTRACEACT_PRINTA                4       /* printa() action */
#define DTRACEACT_LIBACT                5       /* library-controlled action */
#define DTRACEACT_PRINTM                6       /* printm() action */
#define DTRACEACT_PRINTT                7       /* printt() action */

#define DTRACEACT_PROC                  0x0100
#define DTRACEACT_USTACK                (DTRACEACT_PROC + 1)
#define DTRACEACT_JSTACK                (DTRACEACT_PROC + 2)
#define DTRACEACT_USYM                  (DTRACEACT_PROC + 3)
#define DTRACEACT_UMOD                  (DTRACEACT_PROC + 4)
#define DTRACEACT_UADDR                 (DTRACEACT_PROC + 5)

#define DTRACEACT_PROC_DESTRUCTIVE      0x0200
#define DTRACEACT_STOP                  (DTRACEACT_PROC_DESTRUCTIVE + 1)
#define DTRACEACT_RAISE                 (DTRACEACT_PROC_DESTRUCTIVE + 2)
#define DTRACEACT_SYSTEM                (DTRACEACT_PROC_DESTRUCTIVE + 3)
#define DTRACEACT_FREOPEN               (DTRACEACT_PROC_DESTRUCTIVE + 4)

#define DTRACEACT_PROC_CONTROL          0x0300

#define DTRACEACT_KERNEL                0x0400
#define DTRACEACT_STACK                 (DTRACEACT_KERNEL + 1)
#define DTRACEACT_SYM                   (DTRACEACT_KERNEL + 2)
#define DTRACEACT_MOD                   (DTRACEACT_KERNEL + 3)

#define DTRACEACT_KERNEL_DESTRUCTIVE    0x0500
#define DTRACEACT_BREAKPOINT            (DTRACEACT_KERNEL_DESTRUCTIVE + 1)
#define DTRACEACT_PANIC                 (DTRACEACT_KERNEL_DESTRUCTIVE + 2)
#define DTRACEACT_CHILL                 (DTRACEACT_KERNEL_DESTRUCTIVE + 3)

#define DTRACEACT_SPECULATIVE           0x0600
#define DTRACEACT_SPECULATE             (DTRACEACT_SPECULATIVE + 1)
#define DTRACEACT_COMMIT                (DTRACEACT_SPECULATIVE + 2)
#define DTRACEACT_DISCARD               (DTRACEACT_SPECULATIVE + 3)

#define DTRACEACT_CLASS(x)              ((x) & 0xff00)

#define DTRACEACT_ISDESTRUCTIVE(x)      \
        (DTRACEACT_CLASS(x) == DTRACEACT_PROC_DESTRUCTIVE || \
        DTRACEACT_CLASS(x) == DTRACEACT_KERNEL_DESTRUCTIVE)

#define DTRACEACT_ISSPECULATIVE(x)      \
        (DTRACEACT_CLASS(x) == DTRACEACT_SPECULATIVE)

#define DTRACEACT_ISPRINTFLIKE(x)       \
        ((x) == DTRACEACT_PRINTF || (x) == DTRACEACT_PRINTA || \
        (x) == DTRACEACT_SYSTEM || (x) == DTRACEACT_FREOPEN)

/*
 * DTrace Aggregating Actions
 *
 * These are functions f(x) for which the following is true:
 *
 *    f(f(x_0) U f(x_1) U ... U f(x_n)) = f(x_0 U x_1 U ... U x_n)
 *
 * where x_n is a set of arbitrary data.  Aggregating actions are in their own
 * DTrace action class, DTTRACEACT_AGGREGATION.  The macros provided here allow
 * for easier processing of the aggregation argument and data payload for a few
 * aggregating actions (notably:  quantize(), lquantize(), and ustack()).
 */
#define DTRACEACT_AGGREGATION           0x0700
#define DTRACEAGG_COUNT                 (DTRACEACT_AGGREGATION + 1)
#define DTRACEAGG_MIN                   (DTRACEACT_AGGREGATION + 2)
#define DTRACEAGG_MAX                   (DTRACEACT_AGGREGATION + 3)
#define DTRACEAGG_AVG                   (DTRACEACT_AGGREGATION + 4)
#define DTRACEAGG_SUM                   (DTRACEACT_AGGREGATION + 5)
#define DTRACEAGG_STDDEV                (DTRACEACT_AGGREGATION + 6)
#define DTRACEAGG_QUANTIZE              (DTRACEACT_AGGREGATION + 7)
#define DTRACEAGG_LQUANTIZE             (DTRACEACT_AGGREGATION + 8)

#define DTRACEACT_ISAGG(x)              \
        (DTRACEACT_CLASS(x) == DTRACEACT_AGGREGATION)

#define DTRACE_QUANTIZE_NBUCKETS        \
        (((sizeof (uint64_t) * NBBY) - 1) * 2 + 1)

#define DTRACE_QUANTIZE_ZEROBUCKET      ((sizeof (uint64_t) * NBBY) - 1)

#define DTRACE_QUANTIZE_BUCKETVAL(buck)                                 \
        (int64_t)((buck) < DTRACE_QUANTIZE_ZEROBUCKET ?                 \
        -(1LL << (DTRACE_QUANTIZE_ZEROBUCKET - 1 - (buck))) :           \
        (buck) == DTRACE_QUANTIZE_ZEROBUCKET ? 0 :                      \
        1LL << ((buck) - DTRACE_QUANTIZE_ZEROBUCKET - 1))

#define DTRACE_LQUANTIZE_STEPSHIFT              48
#define DTRACE_LQUANTIZE_STEPMASK               ((uint64_t)UINT16_MAX << 48)
#define DTRACE_LQUANTIZE_LEVELSHIFT             32
#define DTRACE_LQUANTIZE_LEVELMASK              ((uint64_t)UINT16_MAX << 32)
#define DTRACE_LQUANTIZE_BASESHIFT              0
#define DTRACE_LQUANTIZE_BASEMASK               UINT32_MAX

#define DTRACE_LQUANTIZE_STEP(x)                \
        (uint16_t)(((x) & DTRACE_LQUANTIZE_STEPMASK) >> \
        DTRACE_LQUANTIZE_STEPSHIFT)

#define DTRACE_LQUANTIZE_LEVELS(x)              \
        (uint16_t)(((x) & DTRACE_LQUANTIZE_LEVELMASK) >> \
        DTRACE_LQUANTIZE_LEVELSHIFT)

#define DTRACE_LQUANTIZE_BASE(x)                \
        (int32_t)(((x) & DTRACE_LQUANTIZE_BASEMASK) >> \
        DTRACE_LQUANTIZE_BASESHIFT)

#define DTRACE_USTACK_NFRAMES(x)        (uint32_t)((x) & UINT32_MAX)
#define DTRACE_USTACK_STRSIZE(x)        (uint32_t)((x) >> 32)
#define DTRACE_USTACK_ARG(x, y)         \
        ((((uint64_t)(y)) << 32) | ((x) & UINT32_MAX))

#ifndef _LP64
#if BYTE_ORDER == _BIG_ENDIAN
#define DTRACE_PTR(type, name)  uint32_t name##pad; type *name
#else
#define DTRACE_PTR(type, name)  type *name; uint32_t name##pad
#endif
#else
#define DTRACE_PTR(type, name)  type *name
#endif

/*
 * DTrace Object Format (DOF)
 *
 * DTrace programs can be persistently encoded in the DOF format so that they
 * may be embedded in other programs (for example, in an ELF file) or in the
 * dtrace driver configuration file for use in anonymous tracing.  The DOF
 * format is versioned and extensible so that it can be revised and so that
 * internal data structures can be modified or extended compatibly.  All DOF
 * structures use fixed-size types, so the 32-bit and 64-bit representations
 * are identical and consumers can use either data model transparently.
 *
 * The file layout is structured as follows:
 *
 * +---------------+-------------------+----- ... ----+---- ... ------+
 * |   dof_hdr_t   |  dof_sec_t[ ... ] |   loadable   | non-loadable  |
 * | (file header) | (section headers) | section data | section data  |
 * +---------------+-------------------+----- ... ----+---- ... ------+
 * |<------------ dof_hdr.dofh_loadsz --------------->|               |
 * |<------------ dof_hdr.dofh_filesz ------------------------------->|
 *
 * The file header stores meta-data including a magic number, data model for
 * the instrumentation, data encoding, and properties of the DIF code within.
 * The header describes its own size and the size of the section headers.  By
 * convention, an array of section headers follows the file header, and then
 * the data for all loadable sections and unloadable sections.  This permits
 * consumer code to easily download the headers and all loadable data into the
 * DTrace driver in one contiguous chunk, omitting other extraneous sections.
 *
 * The section headers describe the size, offset, alignment, and section type
 * for each section.  Sections are described using a set of #defines that tell
 * the consumer what kind of data is expected.  Sections can contain links to
 * other sections by storing a dof_secidx_t, an index into the section header
 * array, inside of the section data structures.  The section header includes
 * an entry size so that sections with data arrays can grow their structures.
 *
 * The DOF data itself can contain many snippets of DIF (i.e. >1 DIFOs), which
 * are represented themselves as a collection of related DOF sections.  This
 * permits us to change the set of sections associated with a DIFO over time,
 * and also permits us to encode DIFOs that contain different sets of sections.
 * When a DOF section wants to refer to a DIFO, it stores the dof_secidx_t of a
 * section of type DOF_SECT_DIFOHDR.  This section's data is then an array of
 * dof_secidx_t's which in turn denote the sections associated with this DIFO.
 *
 * This loose coupling of the file structure (header and sections) to the
 * structure of the DTrace program itself (ECB descriptions, action
 * descriptions, and DIFOs) permits activities such as relocation processing
 * to occur in a single pass without having to understand D program structure.
 *
 * Finally, strings are always stored in ELF-style string tables along with a
 * string table section index and string table offset.  Therefore strings in
 * DOF are always arbitrary-length and not bound to the current implementation.
 */

#define DOF_ID_SIZE     16      /* total size of dofh_ident[] in bytes */

typedef struct dof_hdr {
        uint8_t dofh_ident[DOF_ID_SIZE]; /* identification bytes (see below) */
        uint32_t dofh_flags;            /* file attribute flags (if any) */
        uint32_t dofh_hdrsize;          /* size of file header in bytes */
        uint32_t dofh_secsize;          /* size of section header in bytes */
        uint32_t dofh_secnum;           /* number of section headers */
        uint64_t dofh_secoff;           /* file offset of section headers */
        uint64_t dofh_loadsz;           /* file size of loadable portion */
        uint64_t dofh_filesz;           /* file size of entire DOF file */
        uint64_t dofh_pad;              /* reserved for future use */
} dof_hdr_t;

#define DOF_ID_MAG0     0       /* first byte of magic number */
#define DOF_ID_MAG1     1       /* second byte of magic number */
#define DOF_ID_MAG2     2       /* third byte of magic number */
#define DOF_ID_MAG3     3       /* fourth byte of magic number */
#define DOF_ID_MODEL    4       /* DOF data model (see below) */
#define DOF_ID_ENCODING 5       /* DOF data encoding (see below) */
#define DOF_ID_VERSION  6       /* DOF file format major version (see below) */
#define DOF_ID_DIFVERS  7       /* DIF instruction set version */
#define DOF_ID_DIFIREG  8       /* DIF integer registers used by compiler */
#define DOF_ID_DIFTREG  9       /* DIF tuple registers used by compiler */
#define DOF_ID_PAD      10      /* start of padding bytes (all zeroes) */

#define DOF_MAG_MAG0    0x7F    /* DOF_ID_MAG[0-3] */
#define DOF_MAG_MAG1    'D'
#define DOF_MAG_MAG2    'O'
#define DOF_MAG_MAG3    'F'

#define DOF_MAG_STRING  "\177DOF"
#define DOF_MAG_STRLEN  4

#define DOF_MODEL_NONE  0       /* DOF_ID_MODEL */
#define DOF_MODEL_ILP32 1
#define DOF_MODEL_LP64  2

#ifdef _LP64
#define DOF_MODEL_NATIVE        DOF_MODEL_LP64
#else
#define DOF_MODEL_NATIVE        DOF_MODEL_ILP32
#endif

#define DOF_ENCODE_NONE 0       /* DOF_ID_ENCODING */
#define DOF_ENCODE_LSB  1
#define DOF_ENCODE_MSB  2

#if BYTE_ORDER == _BIG_ENDIAN
#define DOF_ENCODE_NATIVE       DOF_ENCODE_MSB
#else
#define DOF_ENCODE_NATIVE       DOF_ENCODE_LSB
#endif

#define DOF_VERSION_1   1       /* DOF version 1: Solaris 10 FCS */
#define DOF_VERSION_2   2       /* DOF version 2: Solaris Express 6/06 */
#define DOF_VERSION     DOF_VERSION_2   /* Latest DOF version */

#define DOF_FL_VALID    0       /* mask of all valid dofh_flags bits */

typedef uint32_t dof_secidx_t;  /* section header table index type */
typedef uint32_t dof_stridx_t;  /* string table index type */

#define DOF_SECIDX_NONE (-1U)   /* null value for section indices */
#define DOF_STRIDX_NONE (-1U)   /* null value for string indices */

typedef struct dof_sec {
        uint32_t dofs_type;     /* section type (see below) */
        uint32_t dofs_align;    /* section data memory alignment */
        uint32_t dofs_flags;    /* section flags (if any) */
        uint32_t dofs_entsize;  /* size of section entry (if table) */
        uint64_t dofs_offset;   /* offset of section data within file */
        uint64_t dofs_size;     /* size of section data in bytes */
} dof_sec_t;

#define DOF_SECT_NONE           0       /* null section */
#define DOF_SECT_COMMENTS       1       /* compiler comments */
#define DOF_SECT_SOURCE         2       /* D program source code */
#define DOF_SECT_ECBDESC        3       /* dof_ecbdesc_t */
#define DOF_SECT_PROBEDESC      4       /* dof_probedesc_t */
#define DOF_SECT_ACTDESC        5       /* dof_actdesc_t array */
#define DOF_SECT_DIFOHDR        6       /* dof_difohdr_t (variable length) */
#define DOF_SECT_DIF            7       /* uint32_t array of byte code */
#define DOF_SECT_STRTAB         8       /* string table */
#define DOF_SECT_VARTAB         9       /* dtrace_difv_t array */
#define DOF_SECT_RELTAB         10      /* dof_relodesc_t array */
#define DOF_SECT_TYPTAB         11      /* dtrace_diftype_t array */
#define DOF_SECT_URELHDR        12      /* dof_relohdr_t (user relocations) */
#define DOF_SECT_KRELHDR        13      /* dof_relohdr_t (kernel relocations) */
#define DOF_SECT_OPTDESC        14      /* dof_optdesc_t array */
#define DOF_SECT_PROVIDER       15      /* dof_provider_t */
#define DOF_SECT_PROBES         16      /* dof_probe_t array */
#define DOF_SECT_PRARGS         17      /* uint8_t array (probe arg mappings) */
#define DOF_SECT_PROFFS         18      /* uint32_t array (probe arg offsets) */
#define DOF_SECT_INTTAB         19      /* uint64_t array */
#define DOF_SECT_UTSNAME        20      /* struct utsname */
#define DOF_SECT_XLTAB          21      /* dof_xlref_t array */
#define DOF_SECT_XLMEMBERS      22      /* dof_xlmember_t array */
#define DOF_SECT_XLIMPORT       23      /* dof_xlator_t */
#define DOF_SECT_XLEXPORT       24      /* dof_xlator_t */
#define DOF_SECT_PREXPORT       25      /* dof_secidx_t array (exported objs) */
#define DOF_SECT_PRENOFFS       26      /* uint32_t array (enabled offsets) */

#define DOF_SECF_LOAD           1       /* section should be loaded */

typedef struct dof_ecbdesc {
        dof_secidx_t dofe_probes;       /* link to DOF_SECT_PROBEDESC */
        dof_secidx_t dofe_pred;         /* link to DOF_SECT_DIFOHDR */
        dof_secidx_t dofe_actions;      /* link to DOF_SECT_ACTDESC */
        uint32_t dofe_pad;              /* reserved for future use */
        uint64_t dofe_uarg;             /* user-supplied library argument */
} dof_ecbdesc_t;

typedef struct dof_probedesc {
        dof_secidx_t dofp_strtab;       /* link to DOF_SECT_STRTAB section */
        dof_stridx_t dofp_provider;     /* provider string */
        dof_stridx_t dofp_mod;          /* module string */
        dof_stridx_t dofp_func;         /* function string */
        dof_stridx_t dofp_name;         /* name string */
        uint32_t dofp_id;               /* probe identifier (or zero) */
} dof_probedesc_t;

typedef struct dof_actdesc {
        dof_secidx_t dofa_difo;         /* link to DOF_SECT_DIFOHDR */
        dof_secidx_t dofa_strtab;       /* link to DOF_SECT_STRTAB section */
        uint32_t dofa_kind;             /* action kind (DTRACEACT_* constant) */
        uint32_t dofa_ntuple;           /* number of subsequent tuple actions */
        uint64_t dofa_arg;              /* kind-specific argument */
        uint64_t dofa_uarg;             /* user-supplied argument */
} dof_actdesc_t;

typedef struct dof_difohdr {
        dtrace_diftype_t dofd_rtype;    /* return type for this fragment */
        dof_secidx_t dofd_links[1];     /* variable length array of indices */
} dof_difohdr_t;

typedef struct dof_relohdr {
        dof_secidx_t dofr_strtab;       /* link to DOF_SECT_STRTAB for names */
        dof_secidx_t dofr_relsec;       /* link to DOF_SECT_RELTAB for relos */
        dof_secidx_t dofr_tgtsec;       /* link to section we are relocating */
} dof_relohdr_t;

typedef struct dof_relodesc {
        dof_stridx_t dofr_name;         /* string name of relocation symbol */
        uint32_t dofr_type;             /* relo type (DOF_RELO_* constant) */
        uint64_t dofr_offset;           /* byte offset for relocation */
        uint64_t dofr_data;             /* additional type-specific data */
} dof_relodesc_t;

#define DOF_RELO_NONE   0               /* empty relocation entry */
#define DOF_RELO_SETX   1               /* relocate setx value */

typedef struct dof_optdesc {
        uint32_t dofo_option;           /* option identifier */
        dof_secidx_t dofo_strtab;       /* string table, if string option */
        uint64_t dofo_value;            /* option value or string index */
} dof_optdesc_t;

typedef uint32_t dof_attr_t;            /* encoded stability attributes */

#define DOF_ATTR(n, d, c)       (((n) << 24) | ((d) << 16) | ((c) << 8))
#define DOF_ATTR_NAME(a)        (((a) >> 24) & 0xff)
#define DOF_ATTR_DATA(a)        (((a) >> 16) & 0xff)
#define DOF_ATTR_CLASS(a)       (((a) >>  8) & 0xff)

typedef struct dof_provider {
        dof_secidx_t dofpv_strtab;      /* link to DOF_SECT_STRTAB section */
        dof_secidx_t dofpv_probes;      /* link to DOF_SECT_PROBES section */
        dof_secidx_t dofpv_prargs;      /* link to DOF_SECT_PRARGS section */
        dof_secidx_t dofpv_proffs;      /* link to DOF_SECT_PROFFS section */
        dof_stridx_t dofpv_name;        /* provider name string */
        dof_attr_t dofpv_provattr;      /* provider attributes */
        dof_attr_t dofpv_modattr;       /* module attributes */
        dof_attr_t dofpv_funcattr;      /* function attributes */
        dof_attr_t dofpv_nameattr;      /* name attributes */
        dof_attr_t dofpv_argsattr;      /* args attributes */
        dof_secidx_t dofpv_prenoffs;    /* link to DOF_SECT_PRENOFFS section */
} dof_provider_t;

typedef struct dof_probe {
        uint64_t dofpr_addr;            /* probe base address or offset */
        dof_stridx_t dofpr_func;        /* probe function string */
        dof_stridx_t dofpr_name;        /* probe name string */
        dof_stridx_t dofpr_nargv;       /* native argument type strings */
        dof_stridx_t dofpr_xargv;       /* translated argument type strings */
        uint32_t dofpr_argidx;          /* index of first argument mapping */
        uint32_t dofpr_offidx;          /* index of first offset entry */
        uint8_t dofpr_nargc;            /* native argument count */
        uint8_t dofpr_xargc;            /* translated argument count */
        uint16_t dofpr_noffs;           /* number of offset entries for probe */
        uint32_t dofpr_enoffidx;        /* index of first is-enabled offset */
        uint16_t dofpr_nenoffs;         /* number of is-enabled offsets */
        uint16_t dofpr_pad1;            /* reserved for future use */
        uint32_t dofpr_pad2;            /* reserved for future use */
} dof_probe_t;

typedef struct dof_xlator {
        dof_secidx_t dofxl_members;     /* link to DOF_SECT_XLMEMBERS section */
        dof_secidx_t dofxl_strtab;      /* link to DOF_SECT_STRTAB section */
        dof_stridx_t dofxl_argv;        /* input parameter type strings */
        uint32_t dofxl_argc;            /* input parameter list length */
        dof_stridx_t dofxl_type;        /* output type string name */
        dof_attr_t dofxl_attr;          /* output stability attributes */
} dof_xlator_t;

typedef struct dof_xlmember {
        dof_secidx_t dofxm_difo;        /* member link to DOF_SECT_DIFOHDR */
        dof_stridx_t dofxm_name;        /* member name */
        dtrace_diftype_t dofxm_type;    /* member type */
} dof_xlmember_t;

typedef struct dof_xlref {
        dof_secidx_t dofxr_xlator;      /* link to DOF_SECT_XLATORS section */
        uint32_t dofxr_member;          /* index of referenced dof_xlmember */
        uint32_t dofxr_argn;            /* index of argument for DIF_OP_XLARG */
} dof_xlref_t;

/*
 * DTrace Intermediate Format Object (DIFO)
 *
 * A DIFO is used to store the compiled DIF for a D expression, its return
 * type, and its string and variable tables.  The string table is a single
 * buffer of character data into which sets instructions and variable
 * references can reference strings using a byte offset.  The variable table
 * is an array of dtrace_difv_t structures that describe the name and type of
 * each variable and the id used in the DIF code.  This structure is described
 * above in the DIF section of this header file.  The DIFO is used at both
 * user-level (in the library) and in the kernel, but the structure is never
 * passed between the two: the DOF structures form the only interface.  As a
 * result, the definition can change depending on the presence of _KERNEL.
 */
typedef struct dtrace_difo {
        dif_instr_t *dtdo_buf;          /* instruction buffer */
        uint64_t *dtdo_inttab;          /* integer table (optional) */
        char *dtdo_strtab;              /* string table (optional) */
        dtrace_difv_t *dtdo_vartab;     /* variable table (optional) */
        uint_t dtdo_len;                /* length of instruction buffer */
        uint_t dtdo_intlen;             /* length of integer table */
        uint_t dtdo_strlen;             /* length of string table */
        uint_t dtdo_varlen;             /* length of variable table */
        dtrace_diftype_t dtdo_rtype;    /* return type */
        uint_t dtdo_refcnt;             /* owner reference count */
        uint_t dtdo_destructive;        /* invokes destructive subroutines */
#ifndef _KERNEL
        dof_relodesc_t *dtdo_kreltab;   /* kernel relocations */
        dof_relodesc_t *dtdo_ureltab;   /* user relocations */
        struct dt_node **dtdo_xlmtab;   /* translator references */
        uint_t dtdo_krelen;             /* length of krelo table */
        uint_t dtdo_urelen;             /* length of urelo table */
        uint_t dtdo_xlmlen;             /* length of translator table */
#endif
} dtrace_difo_t;

/*
 * DTrace Enabling Description Structures
 *
 * When DTrace is tracking the description of a DTrace enabling entity (probe,
 * predicate, action, ECB, record, etc.), it does so in a description
 * structure.  These structures all end in "desc", and are used at both
 * user-level and in the kernel -- but (with the exception of
 * dtrace_probedesc_t) they are never passed between them.  Typically,
 * user-level will use the description structures when assembling an enabling.
 * It will then distill those description structures into a DOF object (see
 * above), and send it into the kernel.  The kernel will again use the
 * description structures to create a description of the enabling as it reads
 * the DOF.  When the description is complete, the enabling will be actually
 * created -- turning it into the structures that represent the enabling
 * instead of merely describing it.  Not surprisingly, the description
 * structures bear a strong resemblance to the DOF structures that act as their
 * conduit.
 */
struct dtrace_predicate;

typedef struct dtrace_probedesc {
        dtrace_id_t dtpd_id;                    /* probe identifier */
        char dtpd_provider[DTRACE_PROVNAMELEN]; /* probe provider name */
        char dtpd_mod[DTRACE_MODNAMELEN];       /* probe module name */
        char dtpd_func[DTRACE_FUNCNAMELEN];     /* probe function name */
        char dtpd_name[DTRACE_NAMELEN];         /* probe name */
} dtrace_probedesc_t;

typedef struct dtrace_repldesc {
        dtrace_probedesc_t dtrpd_match;         /* probe descr. to match */
        dtrace_probedesc_t dtrpd_create;        /* probe descr. to create */
} dtrace_repldesc_t;

typedef struct dtrace_preddesc {
        dtrace_difo_t *dtpdd_difo;              /* pointer to DIF object */
        struct dtrace_predicate *dtpdd_predicate; /* pointer to predicate */
} dtrace_preddesc_t;

typedef struct dtrace_actdesc {
        dtrace_difo_t *dtad_difo;               /* pointer to DIF object */
        struct dtrace_actdesc *dtad_next;       /* next action */
        dtrace_actkind_t dtad_kind;             /* kind of action */
        uint32_t dtad_ntuple;                   /* number in tuple */
        uint64_t dtad_arg;                      /* action argument */
        uint64_t dtad_uarg;                     /* user argument */
        int dtad_refcnt;                        /* reference count */
} dtrace_actdesc_t;

typedef struct dtrace_ecbdesc {
        dtrace_actdesc_t *dted_action;          /* action description(s) */
        dtrace_preddesc_t dted_pred;            /* predicate description */
        dtrace_probedesc_t dted_probe;          /* probe description */
        uint64_t dted_uarg;                     /* library argument */
        int dted_refcnt;                        /* reference count */
} dtrace_ecbdesc_t;

/*
 * DTrace Metadata Description Structures
 *
 * DTrace separates the trace data stream from the metadata stream.  The only
 * metadata tokens placed in the data stream are enabled probe identifiers
 * (EPIDs) or (in the case of aggregations) aggregation identifiers.  In order
 * to determine the structure of the data, DTrace consumers pass the token to
 * the kernel, and receive in return a corresponding description of the enabled
 * probe (via the dtrace_eprobedesc structure) or the aggregation (via the
 * dtrace_aggdesc structure).  Both of these structures are expressed in terms
 * of record descriptions (via the dtrace_recdesc structure) that describe the
 * exact structure of the data.  Some record descriptions may also contain a
 * format identifier; this additional bit of metadata can be retrieved from the
 * kernel, for which a format description is returned via the dtrace_fmtdesc
 * structure.  Note that all four of these structures must be bitness-neutral
 * to allow for a 32-bit DTrace consumer on a 64-bit kernel.
 */
typedef struct dtrace_recdesc {
        dtrace_actkind_t dtrd_action;           /* kind of action */
        uint32_t dtrd_size;                     /* size of record */
        uint32_t dtrd_offset;                   /* offset in ECB's data */
        uint16_t dtrd_alignment;                /* required alignment */
        uint16_t dtrd_format;                   /* format, if any */
        uint64_t dtrd_arg;                      /* action argument */
        uint64_t dtrd_uarg;                     /* user argument */
} dtrace_recdesc_t;

typedef struct dtrace_eprobedesc {
        dtrace_epid_t dtepd_epid;               /* enabled probe ID */
        dtrace_id_t dtepd_probeid;              /* probe ID */
        uint64_t dtepd_uarg;                    /* library argument */
        uint32_t dtepd_size;                    /* total size */
        int dtepd_nrecs;                        /* number of records */
        dtrace_recdesc_t dtepd_rec[1];          /* records themselves */
} dtrace_eprobedesc_t;

typedef struct dtrace_aggdesc {
        DTRACE_PTR(char, dtagd_name);           /* not filled in by kernel */
        dtrace_aggvarid_t dtagd_varid;          /* not filled in by kernel */
        int dtagd_flags;                        /* not filled in by kernel */
        dtrace_aggid_t dtagd_id;                /* aggregation ID */
        dtrace_epid_t dtagd_epid;               /* enabled probe ID */
        uint32_t dtagd_size;                    /* size in bytes */
        int dtagd_nrecs;                        /* number of records */
        uint32_t dtagd_pad;                     /* explicit padding */
        dtrace_recdesc_t dtagd_rec[1];          /* record descriptions */
} dtrace_aggdesc_t;

typedef struct dtrace_fmtdesc {
        DTRACE_PTR(char, dtfd_string);          /* format string */
        int dtfd_length;                        /* length of format string */
        uint16_t dtfd_format;                   /* format identifier */
} dtrace_fmtdesc_t;

#define DTRACE_SIZEOF_EPROBEDESC(desc)                          \
        (sizeof (dtrace_eprobedesc_t) + ((desc)->dtepd_nrecs ?  \
        (((desc)->dtepd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))

#define DTRACE_SIZEOF_AGGDESC(desc)                             \
        (sizeof (dtrace_aggdesc_t) + ((desc)->dtagd_nrecs ?     \
        (((desc)->dtagd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))

/*
 * DTrace Option Interface
 *
 * Run-time DTrace options are set and retrieved via DOF_SECT_OPTDESC sections
 * in a DOF image.  The dof_optdesc structure contains an option identifier and
 * an option value.  The valid option identifiers are found below; the mapping
 * between option identifiers and option identifying strings is maintained at
 * user-level.  Note that the value of DTRACEOPT_UNSET is such that all of the
 * following are potentially valid option values:  all positive integers, zero
 * and negative one.  Some options (notably "bufpolicy" and "bufresize") take
 * predefined tokens as their values; these are defined with
 * DTRACEOPT_{option}_{token}.
 */
#define DTRACEOPT_BUFSIZE       0       /* buffer size */
#define DTRACEOPT_BUFPOLICY     1       /* buffer policy */
#define DTRACEOPT_DYNVARSIZE    2       /* dynamic variable size */
#define DTRACEOPT_AGGSIZE       3       /* aggregation size */
#define DTRACEOPT_SPECSIZE      4       /* speculation size */
#define DTRACEOPT_NSPEC         5       /* number of speculations */
#define DTRACEOPT_STRSIZE       6       /* string size */
#define DTRACEOPT_CLEANRATE     7       /* dynvar cleaning rate */
#define DTRACEOPT_CPU           8       /* CPU to trace */
#define DTRACEOPT_BUFRESIZE     9       /* buffer resizing policy */
#define DTRACEOPT_GRABANON      10      /* grab anonymous state, if any */
#define DTRACEOPT_FLOWINDENT    11      /* indent function entry/return */
#define DTRACEOPT_QUIET         12      /* only output explicitly traced data */
#define DTRACEOPT_STACKFRAMES   13      /* number of stack frames */
#define DTRACEOPT_USTACKFRAMES  14      /* number of user stack frames */
#define DTRACEOPT_AGGRATE       15      /* aggregation snapshot rate */
#define DTRACEOPT_SWITCHRATE    16      /* buffer switching rate */
#define DTRACEOPT_STATUSRATE    17      /* status rate */
#define DTRACEOPT_DESTRUCTIVE   18      /* destructive actions allowed */
#define DTRACEOPT_STACKINDENT   19      /* output indent for stack traces */
#define DTRACEOPT_RAWBYTES      20      /* always print bytes in raw form */
#define DTRACEOPT_JSTACKFRAMES  21      /* number of jstack() frames */
#define DTRACEOPT_JSTACKSTRSIZE 22      /* size of jstack() string table */
#define DTRACEOPT_AGGSORTKEY    23      /* sort aggregations by key */
#define DTRACEOPT_AGGSORTREV    24      /* reverse-sort aggregations */
#define DTRACEOPT_AGGSORTPOS    25      /* agg. position to sort on */
#define DTRACEOPT_AGGSORTKEYPOS 26      /* agg. key position to sort on */
#define DTRACEOPT_MAX           27      /* number of options */

#define DTRACEOPT_UNSET         (dtrace_optval_t)-2     /* unset option */

#define DTRACEOPT_BUFPOLICY_RING        0       /* ring buffer */
#define DTRACEOPT_BUFPOLICY_FILL        1       /* fill buffer, then stop */
#define DTRACEOPT_BUFPOLICY_SWITCH      2       /* switch buffers */

#define DTRACEOPT_BUFRESIZE_AUTO        0       /* automatic resizing */
#define DTRACEOPT_BUFRESIZE_MANUAL      1       /* manual resizing */

/*
 * DTrace Buffer Interface
 *
 * In order to get a snapshot of the principal or aggregation buffer,
 * user-level passes a buffer description to the kernel with the dtrace_bufdesc
 * structure.  This describes which CPU user-level is interested in, and
 * where user-level wishes the kernel to snapshot the buffer to (the
 * dtbd_data field).  The kernel uses the same structure to pass back some
 * information regarding the buffer:  the size of data actually copied out, the
 * number of drops, the number of errors, and the offset of the oldest record.
 * If the buffer policy is a "switch" policy, taking a snapshot of the
 * principal buffer has the additional effect of switching the active and
 * inactive buffers.  Taking a snapshot of the aggregation buffer _always_ has
 * the additional effect of switching the active and inactive buffers.
 */
typedef struct dtrace_bufdesc {
        uint64_t dtbd_size;                     /* size of buffer */
        uint32_t dtbd_cpu;                      /* CPU or DTRACE_CPUALL */
        uint32_t dtbd_errors;                   /* number of errors */
        uint64_t dtbd_drops;                    /* number of drops */
        DTRACE_PTR(char, dtbd_data);            /* data */
        uint64_t dtbd_oldest;                   /* offset of oldest record */
} dtrace_bufdesc_t;

/*
 * DTrace Status
 *
 * The status of DTrace is relayed via the dtrace_status structure.  This
 * structure contains members to count drops other than the capacity drops
 * available via the buffer interface (see above).  This consists of dynamic
 * drops (including capacity dynamic drops, rinsing drops and dirty drops), and
 * speculative drops (including capacity speculative drops, drops due to busy
 * speculative buffers and drops due to unavailable speculative buffers).
 * Additionally, the status structure contains a field to indicate the number
 * of "fill"-policy buffers have been filled and a boolean field to indicate
 * that exit() has been called.  If the dtst_exiting field is non-zero, no
 * further data will be generated until tracing is stopped (at which time any
 * enablings of the END action will be processed); if user-level sees that
 * this field is non-zero, tracing should be stopped as soon as possible.
 */
typedef struct dtrace_status {
        uint64_t dtst_dyndrops;                 /* dynamic drops */
        uint64_t dtst_dyndrops_rinsing;         /* dyn drops due to rinsing */
        uint64_t dtst_dyndrops_dirty;           /* dyn drops due to dirty */
        uint64_t dtst_specdrops;                /* speculative drops */
        uint64_t dtst_specdrops_busy;           /* spec drops due to busy */
        uint64_t dtst_specdrops_unavail;        /* spec drops due to unavail */
        uint64_t dtst_errors;                   /* total errors */
        uint64_t dtst_filled;                   /* number of filled bufs */
        uint64_t dtst_stkstroverflows;          /* stack string tab overflows */
        uint64_t dtst_dblerrors;                /* errors in ERROR probes */
        char dtst_killed;                       /* non-zero if killed */
        char dtst_exiting;                      /* non-zero if exit() called */
        char dtst_pad[6];                       /* pad out to 64-bit align */
} dtrace_status_t;

/*
 * DTrace Configuration
 *
 * User-level may need to understand some elements of the kernel DTrace
 * configuration in order to generate correct DIF.  This information is
 * conveyed via the dtrace_conf structure.
 */
typedef struct dtrace_conf {
        uint_t dtc_difversion;                  /* supported DIF version */
        uint_t dtc_difintregs;                  /* # of DIF integer registers */
        uint_t dtc_diftupregs;                  /* # of DIF tuple registers */
        uint_t dtc_ctfmodel;                    /* CTF data model */
        uint_t dtc_pad[8];                      /* reserved for future use */
} dtrace_conf_t;

/*
 * DTrace Faults
 *
 * The constants below DTRACEFLT_LIBRARY indicate probe processing faults;
 * constants at or above DTRACEFLT_LIBRARY indicate faults in probe
 * postprocessing at user-level.  Probe processing faults induce an ERROR
 * probe and are replicated in unistd.d to allow users' ERROR probes to decode
 * the error condition using thse symbolic labels.
 */
#define DTRACEFLT_UNKNOWN               0       /* Unknown fault */
#define DTRACEFLT_BADADDR               1       /* Bad address */
#define DTRACEFLT_BADALIGN              2       /* Bad alignment */
#define DTRACEFLT_ILLOP                 3       /* Illegal operation */
#define DTRACEFLT_DIVZERO               4       /* Divide-by-zero */
#define DTRACEFLT_NOSCRATCH             5       /* Out of scratch space */
#define DTRACEFLT_KPRIV                 6       /* Illegal kernel access */
#define DTRACEFLT_UPRIV                 7       /* Illegal user access */
#define DTRACEFLT_TUPOFLOW              8       /* Tuple stack overflow */
#define DTRACEFLT_BADSTACK              9       /* Bad stack */

#define DTRACEFLT_LIBRARY               1000    /* Library-level fault */

/*
 * DTrace Argument Types
 *
 * Because it would waste both space and time, argument types do not reside
 * with the probe.  In order to determine argument types for args[X]
 * variables, the D compiler queries for argument types on a probe-by-probe
 * basis.  (This optimizes for the common case that arguments are either not
 * used or used in an untyped fashion.)  Typed arguments are specified with a
 * string of the type name in the dtragd_native member of the argument
 * description structure.  Typed arguments may be further translated to types
 * of greater stability; the provider indicates such a translated argument by
 * filling in the dtargd_xlate member with the string of the translated type.
 * Finally, the provider may indicate which argument value a given argument
 * maps to by setting the dtargd_mapping member -- allowing a single argument
 * to map to multiple args[X] variables.
 */
typedef struct dtrace_argdesc {
        dtrace_id_t dtargd_id;                  /* probe identifier */
        int dtargd_ndx;                         /* arg number (-1 iff none) */
        int dtargd_mapping;                     /* value mapping */
        char dtargd_native[DTRACE_ARGTYPELEN];  /* native type name */
        char dtargd_xlate[DTRACE_ARGTYPELEN];   /* translated type name */
} dtrace_argdesc_t;

/*
 * DTrace Stability Attributes
 *
 * Each DTrace provider advertises the name and data stability of each of its
 * probe description components, as well as its architectural dependencies.
 * The D compiler can query the provider attributes (dtrace_pattr_t below) in
 * order to compute the properties of an input program and report them.
 */
typedef uint8_t dtrace_stability_t;     /* stability code (see attributes(5)) */
typedef uint8_t dtrace_class_t;         /* architectural dependency class */

#define DTRACE_STABILITY_INTERNAL       0       /* private to DTrace itself */
#define DTRACE_STABILITY_PRIVATE        1       /* private to Sun (see docs) */
#define DTRACE_STABILITY_OBSOLETE       2       /* scheduled for removal */
#define DTRACE_STABILITY_EXTERNAL       3       /* not controlled by Sun */
#define DTRACE_STABILITY_UNSTABLE       4       /* new or rapidly changing */
#define DTRACE_STABILITY_EVOLVING       5       /* less rapidly changing */
#define DTRACE_STABILITY_STABLE         6       /* mature interface from Sun */
#define DTRACE_STABILITY_STANDARD       7       /* industry standard */
#define DTRACE_STABILITY_MAX            7       /* maximum valid stability */

#define DTRACE_CLASS_UNKNOWN    0       /* unknown architectural dependency */
#define DTRACE_CLASS_CPU        1       /* CPU-module-specific */
#define DTRACE_CLASS_PLATFORM   2       /* platform-specific (uname -i) */
#define DTRACE_CLASS_GROUP      3       /* hardware-group-specific (uname -m) */
#define DTRACE_CLASS_ISA        4       /* ISA-specific (uname -p) */
#define DTRACE_CLASS_COMMON     5       /* common to all systems */
#define DTRACE_CLASS_MAX        5       /* maximum valid class */

#define DTRACE_PRIV_NONE        0x0000
#define DTRACE_PRIV_KERNEL      0x0001
#define DTRACE_PRIV_USER        0x0002
#define DTRACE_PRIV_PROC        0x0004
#define DTRACE_PRIV_OWNER       0x0008
#define DTRACE_PRIV_ZONEOWNER   0x0010

#define DTRACE_PRIV_ALL \
        (DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER | \
        DTRACE_PRIV_PROC | DTRACE_PRIV_OWNER | DTRACE_PRIV_ZONEOWNER)

typedef struct dtrace_ppriv {
        uint32_t dtpp_flags;                    /* privilege flags */
        uid_t dtpp_uid;                         /* user ID */
        zoneid_t dtpp_zoneid;                   /* zone ID */
} dtrace_ppriv_t;

typedef struct dtrace_attribute {
        dtrace_stability_t dtat_name;           /* entity name stability */
        dtrace_stability_t dtat_data;           /* entity data stability */
        dtrace_class_t dtat_class;              /* entity data dependency */
} dtrace_attribute_t;

typedef struct dtrace_pattr {
        dtrace_attribute_t dtpa_provider;       /* provider attributes */
        dtrace_attribute_t dtpa_mod;            /* module attributes */
        dtrace_attribute_t dtpa_func;           /* function attributes */
        dtrace_attribute_t dtpa_name;           /* name attributes */
        dtrace_attribute_t dtpa_args;           /* args[] attributes */
} dtrace_pattr_t;

typedef struct dtrace_providerdesc {
        char dtvd_name[DTRACE_PROVNAMELEN];     /* provider name */
        dtrace_pattr_t dtvd_attr;               /* stability attributes */
        dtrace_ppriv_t dtvd_priv;               /* privileges required */
} dtrace_providerdesc_t;

/*
 * DTrace Pseudodevice Interface
 *
 * DTrace is controlled through ioctl(2)'s to the in-kernel dtrace:dtrace
 * pseudodevice driver.  These ioctls comprise the user-kernel interface to
 * DTrace.
 */
#if defined(sun)
#define DTRACEIOC               (('d' << 24) | ('t' << 16) | ('r' << 8))
#define DTRACEIOC_PROVIDER      (DTRACEIOC | 1)         /* provider query */
#define DTRACEIOC_PROBES        (DTRACEIOC | 2)         /* probe query */
#define DTRACEIOC_BUFSNAP       (DTRACEIOC | 4)         /* snapshot buffer */
#define DTRACEIOC_PROBEMATCH    (DTRACEIOC | 5)         /* match probes */
#define DTRACEIOC_ENABLE        (DTRACEIOC | 6)         /* enable probes */
#define DTRACEIOC_AGGSNAP       (DTRACEIOC | 7)         /* snapshot agg. */
#define DTRACEIOC_EPROBE        (DTRACEIOC | 8)         /* get eprobe desc. */
#define DTRACEIOC_PROBEARG      (DTRACEIOC | 9)         /* get probe arg */
#define DTRACEIOC_CONF          (DTRACEIOC | 10)        /* get config. */
#define DTRACEIOC_STATUS        (DTRACEIOC | 11)        /* get status */
#define DTRACEIOC_GO            (DTRACEIOC | 12)        /* start tracing */
#define DTRACEIOC_STOP          (DTRACEIOC | 13)        /* stop tracing */
#define DTRACEIOC_AGGDESC       (DTRACEIOC | 15)        /* get agg. desc. */
#define DTRACEIOC_FORMAT        (DTRACEIOC | 16)        /* get format str */
#define DTRACEIOC_DOFGET        (DTRACEIOC | 17)        /* get DOF */
#define DTRACEIOC_REPLICATE     (DTRACEIOC | 18)        /* replicate enab */
#else
#define DTRACEIOC_PROVIDER      _IOWR('x',1,dtrace_providerdesc_t)
                                                        /* provider query */
#define DTRACEIOC_PROBES        _IOWR('x',2,dtrace_probedesc_t)
                                                        /* probe query */
#define DTRACEIOC_BUFSNAP       _IOW('x',4,dtrace_bufdesc_t *)  
                                                        /* snapshot buffer */
#define DTRACEIOC_PROBEMATCH    _IOWR('x',5,dtrace_probedesc_t)
                                                        /* match probes */
typedef struct {
        void    *dof;           /* DOF userland address written to driver. */
        int     n_matched;      /* # matches returned by driver. */
} dtrace_enable_io_t;
#define DTRACEIOC_ENABLE        _IOWR('x',6,dtrace_enable_io_t)
                                                        /* enable probes */
#define DTRACEIOC_AGGSNAP       _IOW('x',7,dtrace_bufdesc_t *)
                                                        /* snapshot agg. */
#define DTRACEIOC_EPROBE        _IOW('x',8,dtrace_eprobedesc_t)
                                                        /* get eprobe desc. */
#define DTRACEIOC_PROBEARG      _IOWR('x',9,dtrace_argdesc_t)
                                                        /* get probe arg */
#define DTRACEIOC_CONF          _IOR('x',10,dtrace_conf_t)
                                                        /* get config. */
#define DTRACEIOC_STATUS        _IOR('x',11,dtrace_status_t)
                                                        /* get status */
#define DTRACEIOC_GO            _IOR('x',12,processorid_t)
                                                        /* start tracing */
#define DTRACEIOC_STOP          _IOWR('x',13,processorid_t)
                                                        /* stop tracing */
#define DTRACEIOC_AGGDESC       _IOW('x',15,dtrace_aggdesc_t *) 
                                                        /* get agg. desc. */
#define DTRACEIOC_FORMAT        _IOWR('x',16,dtrace_fmtdesc_t)  
                                                        /* get format str */
#define DTRACEIOC_DOFGET        _IOW('x',17,dof_hdr_t *)
                                                        /* get DOF */
#define DTRACEIOC_REPLICATE     _IOW('x',18,dtrace_repldesc_t)  
                                                        /* replicate enab */
#endif

/*
 * DTrace Helpers
 *
 * In general, DTrace establishes probes in processes and takes actions on
 * processes without knowing their specific user-level structures.  Instead of
 * existing in the framework, process-specific knowledge is contained by the
 * enabling D program -- which can apply process-specific knowledge by making
 * appropriate use of DTrace primitives like copyin() and copyinstr() to
 * operate on user-level data.  However, there may exist some specific probes
 * of particular semantic relevance that the application developer may wish to
 * explicitly export.  For example, an application may wish to export a probe
 * at the point that it begins and ends certain well-defined transactions.  In
 * addition to providing probes, programs may wish to offer assistance for
 * certain actions.  For example, in highly dynamic environments (e.g., Java),
 * it may be difficult to obtain a stack trace in terms of meaningful symbol
 * names (the translation from instruction addresses to corresponding symbol
 * names may only be possible in situ); these environments may wish to define
 * a series of actions to be applied in situ to obtain a meaningful stack
 * trace.
 *
 * These two mechanisms -- user-level statically defined tracing and assisting
 * DTrace actions -- are provided via DTrace _helpers_.  Helpers are specified
 * via DOF, but unlike enabling DOF, helper DOF may contain definitions of
 * providers, probes and their arguments.  If a helper wishes to provide
 * action assistance, probe descriptions and corresponding DIF actions may be
 * specified in the helper DOF.  For such helper actions, however, the probe
 * description describes the specific helper:  all DTrace helpers have the
 * provider name "dtrace" and the module name "helper", and the name of the
 * helper is contained in the function name (for example, the ustack() helper
 * is named "ustack").  Any helper-specific name may be contained in the name
 * (for example, if a helper were to have a constructor, it might be named
 * "dtrace:helper:<helper>:init").  Helper actions are only called when the
 * action that they are helping is taken.  Helper actions may only return DIF
 * expressions, and may only call the following subroutines:
 *
 *    alloca()      <= Allocates memory out of the consumer's scratch space
 *    bcopy()       <= Copies memory to scratch space
 *    copyin()      <= Copies memory from user-level into consumer's scratch
 *    copyinto()    <= Copies memory into a specific location in scratch
 *    copyinstr()   <= Copies a string into a specific location in scratch
 *
 * Helper actions may only access the following built-in variables:
 *
 *    curthread     <= Current kthread_t pointer
 *    tid           <= Current thread identifier
 *    pid           <= Current process identifier
 *    ppid          <= Parent process identifier
 *    uid           <= Current user ID
 *    gid           <= Current group ID
 *    execname      <= Current executable name
 *    zonename      <= Current zone name
 *
 * Helper actions may not manipulate or allocate dynamic variables, but they
 * may have clause-local and statically-allocated global variables.  The
 * helper action variable state is specific to the helper action -- variables
 * used by the helper action may not be accessed outside of the helper
 * action, and the helper action may not access variables that like outside
 * of it.  Helper actions may not load from kernel memory at-large; they are
 * restricting to loading current user state (via copyin() and variants) and
 * scratch space.  As with probe enablings, helper actions are executed in
 * program order.  The result of the helper action is the result of the last
 * executing helper expression.
 *
 * Helpers -- composed of either providers/probes or probes/actions (or both)
 * -- are added by opening the "helper" minor node, and issuing an ioctl(2)
 * (DTRACEHIOC_ADDDOF) that specifies the dof_helper_t structure. This
 * encapsulates the name and base address of the user-level library or
 * executable publishing the helpers and probes as well as the DOF that
 * contains the definitions of those helpers and probes.
 *
 * The DTRACEHIOC_ADD and DTRACEHIOC_REMOVE are left in place for legacy
 * helpers and should no longer be used.  No other ioctls are valid on the
 * helper minor node.
 */
#define DTRACEHIOC              (('d' << 24) | ('t' << 16) | ('h' << 8))
#define DTRACEHIOC_ADD          (DTRACEHIOC | 1)        /* add helper */
#define DTRACEHIOC_REMOVE       (DTRACEHIOC | 2)        /* remove helper */
#define DTRACEHIOC_ADDDOF       (DTRACEHIOC | 3)        /* add helper DOF */

typedef struct dof_helper {
        char dofhp_mod[DTRACE_MODNAMELEN];      /* executable or library name */
        uint64_t dofhp_addr;                    /* base address of object */
        uint64_t dofhp_dof;                     /* address of helper DOF */
} dof_helper_t;

#define DTRACEMNR_DTRACE        "dtrace"        /* node for DTrace ops */
#define DTRACEMNR_HELPER        "helper"        /* node for helpers */
#define DTRACEMNRN_DTRACE       0               /* minor for DTrace ops */
#define DTRACEMNRN_HELPER       1               /* minor for helpers */
#define DTRACEMNRN_CLONE        2               /* first clone minor */

#ifdef _KERNEL

/*
 * DTrace Provider API
 *
 * The following functions are implemented by the DTrace framework and are
 * used to implement separate in-kernel DTrace providers.  Common functions
 * are provided in uts/common/os/dtrace.c.  ISA-dependent subroutines are
 * defined in uts/<isa>/dtrace/dtrace_asm.s or uts/<isa>/dtrace/dtrace_isa.c.
 *
 * The provider API has two halves:  the API that the providers consume from
 * DTrace, and the API that providers make available to DTrace.
 *
 * 1 Framework-to-Provider API
 *
 * 1.1  Overview
 *
 * The Framework-to-Provider API is represented by the dtrace_pops structure
 * that the provider passes to the framework when registering itself.  This
 * structure consists of the following members:
 *
 *   dtps_provide()          <-- Provide all probes, all modules
 *   dtps_provide_module()   <-- Provide all probes in specified module
 *   dtps_enable()           <-- Enable specified probe
 *   dtps_disable()          <-- Disable specified probe
 *   dtps_suspend()          <-- Suspend specified probe
 *   dtps_resume()           <-- Resume specified probe
 *   dtps_getargdesc()       <-- Get the argument description for args[X]
 *   dtps_getargval()        <-- Get the value for an argX or args[X] variable
 *   dtps_usermode()         <-- Find out if the probe was fired in user mode
 *   dtps_destroy()          <-- Destroy all state associated with this probe
 *
 * 1.2  void dtps_provide(void *arg, const dtrace_probedesc_t *spec)
 *
 * 1.2.1  Overview
 *
 *   Called to indicate that the provider should provide all probes.  If the
 *   specified description is non-NULL, dtps_provide() is being called because
 *   no probe matched a specified probe -- if the provider has the ability to
 *   create custom probes, it may wish to create a probe that matches the
 *   specified description.
 *
 * 1.2.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register().  The
 *   second argument is a pointer to a probe description that the provider may
 *   wish to consider when creating custom probes.  The provider is expected to
 *   call back into the DTrace framework via dtrace_probe_create() to create
 *   any necessary probes.  dtps_provide() may be called even if the provider
 *   has made available all probes; the provider should check the return value
 *   of dtrace_probe_create() to handle this case.  Note that the provider need
 *   not implement both dtps_provide() and dtps_provide_module(); see
 *   "Arguments and Notes" for dtrace_register(), below.
 *
 * 1.2.3  Return value
 *
 *   None.
 *
 * 1.2.4  Caller's context
 *
 *   dtps_provide() is typically called from open() or ioctl() context, but may
 *   be called from other contexts as well.  The DTrace framework is locked in
 *   such a way that providers may not register or unregister.  This means that
 *   the provider may not call any DTrace API that affects its registration with
 *   the framework, including dtrace_register(), dtrace_unregister(),
 *   dtrace_invalidate(), and dtrace_condense().  However, the context is such
 *   that the provider may (and indeed, is expected to) call probe-related
 *   DTrace routines, including dtrace_probe_create(), dtrace_probe_lookup(),
 *   and dtrace_probe_arg().
 *
 * 1.3  void dtps_provide_module(void *arg, modctl_t *mp)
 *
 * 1.3.1  Overview
 *
 *   Called to indicate that the provider should provide all probes in the
 *   specified module.
 *
 * 1.3.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register().  The
 *   second argument is a pointer to a modctl structure that indicates the
 *   module for which probes should be created.
 *
 * 1.3.3  Return value
 *
 *   None.
 *
 * 1.3.4  Caller's context
 *
 *   dtps_provide_module() may be called from open() or ioctl() context, but
 *   may also be called from a module loading context.  mod_lock is held, and
 *   the DTrace framework is locked in such a way that providers may not
 *   register or unregister.  This means that the provider may not call any
 *   DTrace API that affects its registration with the framework, including
 *   dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
 *   dtrace_condense().  However, the context is such that the provider may (and
 *   indeed, is expected to) call probe-related DTrace routines, including
 *   dtrace_probe_create(), dtrace_probe_lookup(), and dtrace_probe_arg().  Note
 *   that the provider need not implement both dtps_provide() and
 *   dtps_provide_module(); see "Arguments and Notes" for dtrace_register(),
 *   below.
 *
 * 1.4  void dtps_enable(void *arg, dtrace_id_t id, void *parg)
 *
 * 1.4.1  Overview
 *
 *   Called to enable the specified probe.
 *
 * 1.4.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register().  The
 *   second argument is the identifier of the probe to be enabled.  The third
 *   argument is the probe argument as passed to dtrace_probe_create().
 *   dtps_enable() will be called when a probe transitions from not being
 *   enabled at all to having one or more ECB.  The number of ECBs associated
 *   with the probe may change without subsequent calls into the provider.
 *   When the number of ECBs drops to zero, the provider will be explicitly
 *   told to disable the probe via dtps_disable().  dtrace_probe() should never
 *   be called for a probe identifier that hasn't been explicitly enabled via
 *   dtps_enable().
 *
 * 1.4.3  Return value
 *
 *   None.
 *
 * 1.4.4  Caller's context
 *
 *   The DTrace framework is locked in such a way that it may not be called
 *   back into at all.  cpu_lock is held.  mod_lock is not held and may not
 *   be acquired.
 *
 * 1.5  void dtps_disable(void *arg, dtrace_id_t id, void *parg)
 *
 * 1.5.1  Overview
 *
 *   Called to disable the specified probe.
 *
 * 1.5.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register().  The
 *   second argument is the identifier of the probe to be disabled.  The third
 *   argument is the probe argument as passed to dtrace_probe_create().
 *   dtps_disable() will be called when a probe transitions from being enabled
 *   to having zero ECBs.  dtrace_probe() should never be called for a probe
 *   identifier that has been explicitly enabled via dtps_disable().
 *
 * 1.5.3  Return value
 *
 *   None.
 *
 * 1.5.4  Caller's context
 *
 *   The DTrace framework is locked in such a way that it may not be called
 *   back into at all.  cpu_lock is held.  mod_lock is not held and may not
 *   be acquired.
 *
 * 1.6  void dtps_suspend(void *arg, dtrace_id_t id, void *parg)
 *
 * 1.6.1  Overview
 *
 *   Called to suspend the specified enabled probe.  This entry point is for
 *   providers that may need to suspend some or all of their probes when CPUs
 *   are being powered on or when the boot monitor is being entered for a
 *   prolonged period of time.
 *
 * 1.6.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register().  The
 *   second argument is the identifier of the probe to be suspended.  The
 *   third argument is the probe argument as passed to dtrace_probe_create().
 *   dtps_suspend will only be called on an enabled probe.  Providers that
 *   provide a dtps_suspend entry point will want to take roughly the action
 *   that it takes for dtps_disable.
 *
 * 1.6.3  Return value
 *
 *   None.
 *
 * 1.6.4  Caller's context
 *
 *   Interrupts are disabled.  The DTrace framework is in a state such that the
 *   specified probe cannot be disabled or destroyed for the duration of
 *   dtps_suspend().  As interrupts are disabled, the provider is afforded
 *   little latitude; the provider is expected to do no more than a store to
 *   memory.
 *
 * 1.7  void dtps_resume(void *arg, dtrace_id_t id, void *parg)
 *
 * 1.7.1  Overview
 *
 *   Called to resume the specified enabled probe.  This entry point is for
 *   providers that may need to resume some or all of their probes after the
 *   completion of an event that induced a call to dtps_suspend().
 *
 * 1.7.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register().  The
 *   second argument is the identifier of the probe to be resumed.  The
 *   third argument is the probe argument as passed to dtrace_probe_create().
 *   dtps_resume will only be called on an enabled probe.  Providers that
 *   provide a dtps_resume entry point will want to take roughly the action
 *   that it takes for dtps_enable.
 *
 * 1.7.3  Return value
 *
 *   None.
 *
 * 1.7.4  Caller's context
 *
 *   Interrupts are disabled.  The DTrace framework is in a state such that the
 *   specified probe cannot be disabled or destroyed for the duration of
 *   dtps_resume().  As interrupts are disabled, the provider is afforded
 *   little latitude; the provider is expected to do no more than a store to
 *   memory.
 *
 * 1.8  void dtps_getargdesc(void *arg, dtrace_id_t id, void *parg,
 *           dtrace_argdesc_t *desc)
 *
 * 1.8.1  Overview
 *
 *   Called to retrieve the argument description for an args[X] variable.
 *
 * 1.8.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register(). The
 *   second argument is the identifier of the current probe. The third
 *   argument is the probe argument as passed to dtrace_probe_create(). The
 *   fourth argument is a pointer to the argument description.  This
 *   description is both an input and output parameter:  it contains the
 *   index of the desired argument in the dtargd_ndx field, and expects
 *   the other fields to be filled in upon return.  If there is no argument
 *   corresponding to the specified index, the dtargd_ndx field should be set
 *   to DTRACE_ARGNONE.
 *
 * 1.8.3  Return value
 *
 *   None.  The dtargd_ndx, dtargd_native, dtargd_xlate and dtargd_mapping
 *   members of the dtrace_argdesc_t structure are all output values.
 *
 * 1.8.4  Caller's context
 *
 *   dtps_getargdesc() is called from ioctl() context. mod_lock is held, and
 *   the DTrace framework is locked in such a way that providers may not
 *   register or unregister.  This means that the provider may not call any
 *   DTrace API that affects its registration with the framework, including
 *   dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
 *   dtrace_condense().
 *
 * 1.9  uint64_t dtps_getargval(void *arg, dtrace_id_t id, void *parg,
 *               int argno, int aframes)
 *
 * 1.9.1  Overview
 *
 *   Called to retrieve a value for an argX or args[X] variable.
 *
 * 1.9.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register(). The
 *   second argument is the identifier of the current probe. The third
 *   argument is the probe argument as passed to dtrace_probe_create(). The
 *   fourth argument is the number of the argument (the X in the example in
 *   1.9.1). The fifth argument is the number of stack frames that were used
 *   to get from the actual place in the code that fired the probe to
 *   dtrace_probe() itself, the so-called artificial frames. This argument may
 *   be used to descend an appropriate number of frames to find the correct
 *   values. If this entry point is left NULL, the dtrace_getarg() built-in
 *   function is used.
 *
 * 1.9.3  Return value
 *
 *   The value of the argument.
 *
 * 1.9.4  Caller's context
 *
 *   This is called from within dtrace_probe() meaning that interrupts
 *   are disabled. No locks should be taken within this entry point.
 *
 * 1.10  int dtps_usermode(void *arg, dtrace_id_t id, void *parg)
 *
 * 1.10.1  Overview
 *
 *   Called to determine if the probe was fired in a user context.
 *
 * 1.10.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register(). The
 *   second argument is the identifier of the current probe. The third
 *   argument is the probe argument as passed to dtrace_probe_create().  This
 *   entry point must not be left NULL for providers whose probes allow for
 *   mixed mode tracing, that is to say those probes that can fire during
 *   kernel- _or_ user-mode execution
 *
 * 1.10.3  Return value
 *
 *   A boolean value.
 *
 * 1.10.4  Caller's context
 *
 *   This is called from within dtrace_probe() meaning that interrupts
 *   are disabled. No locks should be taken within this entry point.
 *
 * 1.11 void dtps_destroy(void *arg, dtrace_id_t id, void *parg)
 *
 * 1.11.1 Overview
 *
 *   Called to destroy the specified probe.
 *
 * 1.11.2 Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_register().  The
 *   second argument is the identifier of the probe to be destroyed.  The third
 *   argument is the probe argument as passed to dtrace_probe_create().  The
 *   provider should free all state associated with the probe.  The framework
 *   guarantees that dtps_destroy() is only called for probes that have either
 *   been disabled via dtps_disable() or were never enabled via dtps_enable().
 *   Once dtps_disable() has been called for a probe, no further call will be
 *   made specifying the probe.
 *
 * 1.11.3 Return value
 *
 *   None.
 *
 * 1.11.4 Caller's context
 *
 *   The DTrace framework is locked in such a way that it may not be called
 *   back into at all.  mod_lock is held.  cpu_lock is not held, and may not be
 *   acquired.
 *
 *
 * 2 Provider-to-Framework API
 *
 * 2.1  Overview
 *
 * The Provider-to-Framework API provides the mechanism for the provider to
 * register itself with the DTrace framework, to create probes, to lookup
 * probes and (most importantly) to fire probes.  The Provider-to-Framework
 * consists of:
 *
 *   dtrace_register()       <-- Register a provider with the DTrace framework
 *   dtrace_unregister()     <-- Remove a provider's DTrace registration
 *   dtrace_invalidate()     <-- Invalidate the specified provider
 *   dtrace_condense()       <-- Remove a provider's unenabled probes
 *   dtrace_attached()       <-- Indicates whether or not DTrace has attached
 *   dtrace_probe_create()   <-- Create a DTrace probe
 *   dtrace_probe_lookup()   <-- Lookup a DTrace probe based on its name
 *   dtrace_probe_arg()      <-- Return the probe argument for a specific probe
 *   dtrace_probe()          <-- Fire the specified probe
 *
 * 2.2  int dtrace_register(const char *name, const dtrace_pattr_t *pap,
 *          uint32_t priv, cred_t *cr, const dtrace_pops_t *pops, void *arg,
 *          dtrace_provider_id_t *idp)
 *
 * 2.2.1  Overview
 *
 *   dtrace_register() registers the calling provider with the DTrace
 *   framework.  It should generally be called by DTrace providers in their
 *   attach(9E) entry point.
 *
 * 2.2.2  Arguments and Notes
 *
 *   The first argument is the name of the provider.  The second argument is a
 *   pointer to the stability attributes for the provider.  The third argument
 *   is the privilege flags for the provider, and must be some combination of:
 *
 *     DTRACE_PRIV_NONE     <= All users may enable probes from this provider
 *
 *     DTRACE_PRIV_PROC     <= Any user with privilege of PRIV_DTRACE_PROC may
 *                             enable probes from this provider
 *
 *     DTRACE_PRIV_USER     <= Any user with privilege of PRIV_DTRACE_USER may
 *                             enable probes from this provider
 *
 *     DTRACE_PRIV_KERNEL   <= Any user with privilege of PRIV_DTRACE_KERNEL
 *                             may enable probes from this provider
 *
 *     DTRACE_PRIV_OWNER    <= This flag places an additional constraint on
 *                             the privilege requirements above. These probes
 *                             require either (a) a user ID matching the user
 *                             ID of the cred passed in the fourth argument
 *                             or (b) the PRIV_PROC_OWNER privilege.
 *
 *     DTRACE_PRIV_ZONEOWNER<= This flag places an additional constraint on
 *                             the privilege requirements above. These probes
 *                             require either (a) a zone ID matching the zone
 *                             ID of the cred passed in the fourth argument
 *                             or (b) the PRIV_PROC_ZONE privilege.
 *
 *   Note that these flags designate the _visibility_ of the probes, not
 *   the conditions under which they may or may not fire.
 *
 *   The fourth argument is the credential that is associated with the
 *   provider.  This argument should be NULL if the privilege flags don't
 *   include DTRACE_PRIV_OWNER or DTRACE_PRIV_ZONEOWNER.  If non-NULL, the
 *   framework stashes the uid and zoneid represented by this credential
 *   for use at probe-time, in implicit predicates.  These limit visibility
 *   of the probes to users and/or zones which have sufficient privilege to
 *   access them.
 *
 *   The fifth argument is a DTrace provider operations vector, which provides
 *   the implementation for the Framework-to-Provider API.  (See Section 1,
 *   above.)  This must be non-NULL, and each member must be non-NULL.  The
 *   exceptions to this are (1) the dtps_provide() and dtps_provide_module()
 *   members (if the provider so desires, _one_ of these members may be left
 *   NULL -- denoting that the provider only implements the other) and (2)
 *   the dtps_suspend() and dtps_resume() members, which must either both be
 *   NULL or both be non-NULL.
 *
 *   The sixth argument is a cookie to be specified as the first argument for
 *   each function in the Framework-to-Provider API.  This argument may have
 *   any value.
 *
 *   The final argument is a pointer to dtrace_provider_id_t.  If
 *   dtrace_register() successfully completes, the provider identifier will be
 *   stored in the memory pointed to be this argument.  This argument must be
 *   non-NULL.
 *
 * 2.2.3  Return value
 *
 *   On success, dtrace_register() returns 0 and stores the new provider's
 *   identifier into the memory pointed to by the idp argument.  On failure,
 *   dtrace_register() returns an errno:
 *
 *     EINVAL   The arguments passed to dtrace_register() were somehow invalid.
 *              This may because a parameter that must be non-NULL was NULL,
 *              because the name was invalid (either empty or an illegal
 *              provider name) or because the attributes were invalid.
 *
 *   No other failure code is returned.
 *
 * 2.2.4  Caller's context
 *
 *   dtrace_register() may induce calls to dtrace_provide(); the provider must
 *   hold no locks across dtrace_register() that may also be acquired by
 *   dtrace_provide().  cpu_lock and mod_lock must not be held.
 *
 * 2.3  int dtrace_unregister(dtrace_provider_t id)
 *
 * 2.3.1  Overview
 *
 *   Unregisters the specified provider from the DTrace framework.  It should
 *   generally be called by DTrace providers in their detach(9E) entry point.
 *
 * 2.3.2  Arguments and Notes
 *
 *   The only argument is the provider identifier, as returned from a
 *   successful call to dtrace_register().  As a result of calling
 *   dtrace_unregister(), the DTrace framework will call back into the provider
 *   via the dtps_destroy() entry point.  Once dtrace_unregister() successfully
 *   completes, however, the DTrace framework will no longer make calls through
 *   the Framework-to-Provider API.
 *
 * 2.3.3  Return value
 *
 *   On success, dtrace_unregister returns 0.  On failure, dtrace_unregister()
 *   returns an errno:
 *
 *     EBUSY    There are currently processes that have the DTrace pseudodevice
 *              open, or there exists an anonymous enabling that hasn't yet
 *              been claimed.
 *
 *   No other failure code is returned.
 *
 * 2.3.4  Caller's context
 *
 *   Because a call to dtrace_unregister() may induce calls through the
 *   Framework-to-Provider API, the caller may not hold any lock across
 *   dtrace_register() that is also acquired in any of the Framework-to-
 *   Provider API functions.  Additionally, mod_lock may not be held.
 *
 * 2.4  void dtrace_invalidate(dtrace_provider_id_t id)
 *
 * 2.4.1  Overview
 *
 *   Invalidates the specified provider.  All subsequent probe lookups for the
 *   specified provider will fail, but its probes will not be removed.
 *
 * 2.4.2  Arguments and note
 *
 *   The only argument is the provider identifier, as returned from a
 *   successful call to dtrace_register().  In general, a provider's probes
 *   always remain valid; dtrace_invalidate() is a mechanism for invalidating
 *   an entire provider, regardless of whether or not probes are enabled or
 *   not.  Note that dtrace_invalidate() will _not_ prevent already enabled
 *   probes from firing -- it will merely prevent any new enablings of the
 *   provider's probes.
 *
 * 2.5 int dtrace_condense(dtrace_provider_id_t id)
 *
 * 2.5.1  Overview
 *
 *   Removes all the unenabled probes for the given provider. This function is
 *   not unlike dtrace_unregister(), except that it doesn't remove the
 *   provider just as many of its associated probes as it can.
 *
 * 2.5.2  Arguments and Notes
 *
 *   As with dtrace_unregister(), the sole argument is the provider identifier
 *   as returned from a successful call to dtrace_register().  As a result of
 *   calling dtrace_condense(), the DTrace framework will call back into the
 *   given provider's dtps_destroy() entry point for each of the provider's
 *   unenabled probes.
 *
 * 2.5.3  Return value
 *
 *   Currently, dtrace_condense() always returns 0.  However, consumers of this
 *   function should check the return value as appropriate; its behavior may
 *   change in the future.
 *
 * 2.5.4  Caller's context
 *
 *   As with dtrace_unregister(), the caller may not hold any lock across
 *   dtrace_condense() that is also acquired in the provider's entry points.
 *   Also, mod_lock may not be held.
 *
 * 2.6 int dtrace_attached()
 *
 * 2.6.1  Overview
 *
 *   Indicates whether or not DTrace has attached.
 *
 * 2.6.2  Arguments and Notes
 *
 *   For most providers, DTrace makes initial contact beyond registration.
 *   That is, once a provider has registered with DTrace, it waits to hear
 *   from DTrace to create probes.  However, some providers may wish to
 *   proactively create probes without first being told by DTrace to do so.
 *   If providers wish to do this, they must first call dtrace_attached() to
 *   determine if DTrace itself has attached.  If dtrace_attached() returns 0,
 *   the provider must not make any other Provider-to-Framework API call.
 *
 * 2.6.3  Return value
 *
 *   dtrace_attached() returns 1 if DTrace has attached, 0 otherwise.
 *
 * 2.7  int dtrace_probe_create(dtrace_provider_t id, const char *mod,
 *          const char *func, const char *name, int aframes, void *arg)
 *
 * 2.7.1  Overview
 *
 *   Creates a probe with specified module name, function name, and name.
 *
 * 2.7.2  Arguments and Notes
 *
 *   The first argument is the provider identifier, as returned from a
 *   successful call to dtrace_register().  The second, third, and fourth
 *   arguments are the module name, function name, and probe name,
 *   respectively.  Of these, module name and function name may both be NULL
 *   (in which case the probe is considered to be unanchored), or they may both
 *   be non-NULL.  The name must be non-NULL, and must point to a non-empty
 *   string.
 *
 *   The fifth argument is the number of artificial stack frames that will be
 *   found on the stack when dtrace_probe() is called for the new probe.  These
 *   artificial frames will be automatically be pruned should the stack() or
 *   stackdepth() functions be called as part of one of the probe's ECBs.  If
 *   the parameter doesn't add an artificial frame, this parameter should be
 *   zero.
 *
 *   The final argument is a probe argument that will be passed back to the
 *   provider when a probe-specific operation is called.  (e.g., via
 *   dtps_enable(), dtps_disable(), etc.)
 *
 *   Note that it is up to the provider to be sure that the probe that it
 *   creates does not already exist -- if the provider is unsure of the probe's
 *   existence, it should assure its absence with dtrace_probe_lookup() before
 *   calling dtrace_probe_create().
 *
 * 2.7.3  Return value
 *
 *   dtrace_probe_create() always succeeds, and always returns the identifier
 *   of the newly-created probe.
 *
 * 2.7.4  Caller's context
 *
 *   While dtrace_probe_create() is generally expected to be called from
 *   dtps_provide() and/or dtps_provide_module(), it may be called from other
 *   non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
 *
 * 2.8  dtrace_id_t dtrace_probe_lookup(dtrace_provider_t id, const char *mod,
 *          const char *func, const char *name)
 *
 * 2.8.1  Overview
 *
 *   Looks up a probe based on provdider and one or more of module name,
 *   function name and probe name.
 *
 * 2.8.2  Arguments and Notes
 *
 *   The first argument is the provider identifier, as returned from a
 *   successful call to dtrace_register().  The second, third, and fourth
 *   arguments are the module name, function name, and probe name,
 *   respectively.  Any of these may be NULL; dtrace_probe_lookup() will return
 *   the identifier of the first probe that is provided by the specified
 *   provider and matches all of the non-NULL matching criteria.
 *   dtrace_probe_lookup() is generally used by a provider to be check the
 *   existence of a probe before creating it with dtrace_probe_create().
 *
 * 2.8.3  Return value
 *
 *   If the probe exists, returns its identifier.  If the probe does not exist,
 *   return DTRACE_IDNONE.
 *
 * 2.8.4  Caller's context
 *
 *   While dtrace_probe_lookup() is generally expected to be called from
 *   dtps_provide() and/or dtps_provide_module(), it may also be called from
 *   other non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
 *
 * 2.9  void *dtrace_probe_arg(dtrace_provider_t id, dtrace_id_t probe)
 *
 * 2.9.1  Overview
 *
 *   Returns the probe argument associated with the specified probe.
 *
 * 2.9.2  Arguments and Notes
 *
 *   The first argument is the provider identifier, as returned from a
 *   successful call to dtrace_register().  The second argument is a probe
 *   identifier, as returned from dtrace_probe_lookup() or
 *   dtrace_probe_create().  This is useful if a probe has multiple
 *   provider-specific components to it:  the provider can create the probe
 *   once with provider-specific state, and then add to the state by looking
 *   up the probe based on probe identifier.
 *
 * 2.9.3  Return value
 *
 *   Returns the argument associated with the specified probe.  If the
 *   specified probe does not exist, or if the specified probe is not provided
 *   by the specified provider, NULL is returned.
 *
 * 2.9.4  Caller's context
 *
 *   While dtrace_probe_arg() is generally expected to be called from
 *   dtps_provide() and/or dtps_provide_module(), it may also be called from
 *   other non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
 *
 * 2.10  void dtrace_probe(dtrace_id_t probe, uintptr_t arg0, uintptr_t arg1,
 *              uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
 *
 * 2.10.1  Overview
 *
 *   The epicenter of DTrace:  fires the specified probes with the specified
 *   arguments.
 *
 * 2.10.2  Arguments and Notes
 *
 *   The first argument is a probe identifier as returned by
 *   dtrace_probe_create() or dtrace_probe_lookup().  The second through sixth
 *   arguments are the values to which the D variables "arg0" through "arg4"
 *   will be mapped.
 *
 *   dtrace_probe() should be called whenever the specified probe has fired --
 *   however the provider defines it.
 *
 * 2.10.3  Return value
 *
 *   None.
 *
 * 2.10.4  Caller's context
 *
 *   dtrace_probe() may be called in virtually any context:  kernel, user,
 *   interrupt, high-level interrupt, with arbitrary adaptive locks held, with
 *   dispatcher locks held, with interrupts disabled, etc.  The only latitude
 *   that must be afforded to DTrace is the ability to make calls within
 *   itself (and to its in-kernel subroutines) and the ability to access
 *   arbitrary (but mapped) memory.  On some platforms, this constrains
 *   context.  For example, on UltraSPARC, dtrace_probe() cannot be called
 *   from any context in which TL is greater than zero.  dtrace_probe() may
 *   also not be called from any routine which may be called by dtrace_probe()
 *   -- which includes functions in the DTrace framework and some in-kernel
 *   DTrace subroutines.  All such functions "dtrace_"; providers that
 *   instrument the kernel arbitrarily should be sure to not instrument these
 *   routines.
 */
typedef struct dtrace_pops {
        void (*dtps_provide)(void *arg, dtrace_probedesc_t *spec);
        void (*dtps_provide_module)(void *arg, modctl_t *mp);
        void (*dtps_enable)(void *arg, dtrace_id_t id, void *parg);
        void (*dtps_disable)(void *arg, dtrace_id_t id, void *parg);
        void (*dtps_suspend)(void *arg, dtrace_id_t id, void *parg);
        void (*dtps_resume)(void *arg, dtrace_id_t id, void *parg);
        void (*dtps_getargdesc)(void *arg, dtrace_id_t id, void *parg,
            dtrace_argdesc_t *desc);
        uint64_t (*dtps_getargval)(void *arg, dtrace_id_t id, void *parg,
            int argno, int aframes);
        int (*dtps_usermode)(void *arg, dtrace_id_t id, void *parg);
        void (*dtps_destroy)(void *arg, dtrace_id_t id, void *parg);
} dtrace_pops_t;

typedef uintptr_t       dtrace_provider_id_t;

extern int dtrace_register(const char *, const dtrace_pattr_t *, uint32_t,
    cred_t *, const dtrace_pops_t *, void *, dtrace_provider_id_t *);
extern int dtrace_unregister(dtrace_provider_id_t);
extern int dtrace_condense(dtrace_provider_id_t);
extern void dtrace_invalidate(dtrace_provider_id_t);
extern dtrace_id_t dtrace_probe_lookup(dtrace_provider_id_t, char *,
    char *, char *);
extern dtrace_id_t dtrace_probe_create(dtrace_provider_id_t, const char *,
    const char *, const char *, int, void *);
extern void *dtrace_probe_arg(dtrace_provider_id_t, dtrace_id_t);
extern void dtrace_probe(dtrace_id_t, uintptr_t arg0, uintptr_t arg1,
    uintptr_t arg2, uintptr_t arg3, uintptr_t arg4);

/*
 * DTrace Meta Provider API
 *
 * The following functions are implemented by the DTrace framework and are
 * used to implement meta providers. Meta providers plug into the DTrace
 * framework and are used to instantiate new providers on the fly. At
 * present, there is only one type of meta provider and only one meta
 * provider may be registered with the DTrace framework at a time. The
 * sole meta provider type provides user-land static tracing facilities
 * by taking meta probe descriptions and adding a corresponding provider
 * into the DTrace framework.
 *
 * 1 Framework-to-Provider
 *
 * 1.1 Overview
 *
 * The Framework-to-Provider API is represented by the dtrace_mops structure
 * that the meta provider passes to the framework when registering itself as
 * a meta provider. This structure consists of the following members:
 *
 *   dtms_create_probe()        <-- Add a new probe to a created provider
 *   dtms_provide_pid()         <-- Create a new provider for a given process
 *   dtms_remove_pid()          <-- Remove a previously created provider
 *
 * 1.2  void dtms_create_probe(void *arg, void *parg,
 *           dtrace_helper_probedesc_t *probedesc);
 *
 * 1.2.1  Overview
 *
 *   Called by the DTrace framework to create a new probe in a provider
 *   created by this meta provider.
 *
 * 1.2.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_meta_register().
 *   The second argument is the provider cookie for the associated provider;
 *   this is obtained from the return value of dtms_provide_pid(). The third
 *   argument is the helper probe description.
 *
 * 1.2.3  Return value
 *
 *   None
 *
 * 1.2.4  Caller's context
 *
 *   dtms_create_probe() is called from either ioctl() or module load context.
 *   The DTrace framework is locked in such a way that meta providers may not
 *   register or unregister. This means that the meta provider cannot call
 *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context is
 *   such that the provider may (and is expected to) call provider-related
 *   DTrace provider APIs including dtrace_probe_create().
 *
 * 1.3  void *dtms_provide_pid(void *arg, dtrace_meta_provider_t *mprov,
 *            pid_t pid)
 *
 * 1.3.1  Overview
 *
 *   Called by the DTrace framework to instantiate a new provider given the
 *   description of the provider and probes in the mprov argument. The
 *   meta provider should call dtrace_register() to insert the new provider
 *   into the DTrace framework.
 *
 * 1.3.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_meta_register().
 *   The second argument is a pointer to a structure describing the new
 *   helper provider. The third argument is the process identifier for
 *   process associated with this new provider. Note that the name of the
 *   provider as passed to dtrace_register() should be the contatenation of
 *   the dtmpb_provname member of the mprov argument and the processs
 *   identifier as a string.
 *
 * 1.3.3  Return value
 *
 *   The cookie for the provider that the meta provider creates. This is
 *   the same value that it passed to dtrace_register().
 *
 * 1.3.4  Caller's context
 *
 *   dtms_provide_pid() is called from either ioctl() or module load context.
 *   The DTrace framework is locked in such a way that meta providers may not
 *   register or unregister. This means that the meta provider cannot call
 *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context
 *   is such that the provider may -- and is expected to --  call
 *   provider-related DTrace provider APIs including dtrace_register().
 *
 * 1.4  void dtms_remove_pid(void *arg, dtrace_meta_provider_t *mprov,
 *           pid_t pid)
 *
 * 1.4.1  Overview
 *
 *   Called by the DTrace framework to remove a provider that had previously
 *   been instantiated via the dtms_provide_pid() entry point. The meta
 *   provider need not remove the provider immediately, but this entry
 *   point indicates that the provider should be removed as soon as possible
 *   using the dtrace_unregister() API.
 *
 * 1.4.2  Arguments and notes
 *
 *   The first argument is the cookie as passed to dtrace_meta_register().
 *   The second argument is a pointer to a structure describing the helper
 *   provider. The third argument is the process identifier for process
 *   associated with this new provider.
 *
 * 1.4.3  Return value
 *
 *   None
 *
 * 1.4.4  Caller's context
 *
 *   dtms_remove_pid() is called from either ioctl() or exit() context.
 *   The DTrace framework is locked in such a way that meta providers may not
 *   register or unregister. This means that the meta provider cannot call
 *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context
 *   is such that the provider may -- and is expected to -- call
 *   provider-related DTrace provider APIs including dtrace_unregister().
 */
typedef struct dtrace_helper_probedesc {
        char *dthpb_mod;                        /* probe module */
        char *dthpb_func;                       /* probe function */
        char *dthpb_name;                       /* probe name */
        uint64_t dthpb_base;                    /* base address */
        uint32_t *dthpb_offs;                   /* offsets array */
        uint32_t *dthpb_enoffs;                 /* is-enabled offsets array */
        uint32_t dthpb_noffs;                   /* offsets count */
        uint32_t dthpb_nenoffs;                 /* is-enabled offsets count */
        uint8_t *dthpb_args;                    /* argument mapping array */
        uint8_t dthpb_xargc;                    /* translated argument count */
        uint8_t dthpb_nargc;                    /* native argument count */
        char *dthpb_xtypes;                     /* translated types strings */
        char *dthpb_ntypes;                     /* native types strings */
} dtrace_helper_probedesc_t;

typedef struct dtrace_helper_provdesc {
        char *dthpv_provname;                   /* provider name */
        dtrace_pattr_t dthpv_pattr;             /* stability attributes */
} dtrace_helper_provdesc_t;

typedef struct dtrace_mops {
        void (*dtms_create_probe)(void *, void *, dtrace_helper_probedesc_t *);
        void *(*dtms_provide_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
        void (*dtms_remove_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
} dtrace_mops_t;

typedef uintptr_t       dtrace_meta_provider_id_t;

extern int dtrace_meta_register(const char *, const dtrace_mops_t *, void *,
    dtrace_meta_provider_id_t *);
extern int dtrace_meta_unregister(dtrace_meta_provider_id_t);

/*
 * DTrace Kernel Hooks
 *
 * The following functions are implemented by the base kernel and form a set of
 * hooks used by the DTrace framework.  DTrace hooks are implemented in either
 * uts/common/os/dtrace_subr.c, an ISA-specific assembly file, or in a
 * uts/<platform>/os/dtrace_subr.c corresponding to each hardware platform.
 */

typedef enum dtrace_vtime_state {
        DTRACE_VTIME_INACTIVE = 0,      /* No DTrace, no TNF */
        DTRACE_VTIME_ACTIVE,            /* DTrace virtual time, no TNF */
        DTRACE_VTIME_INACTIVE_TNF,      /* No DTrace, TNF active */
        DTRACE_VTIME_ACTIVE_TNF         /* DTrace virtual time _and_ TNF */
} dtrace_vtime_state_t;

#if defined(sun)
extern dtrace_vtime_state_t dtrace_vtime_active;
#endif
extern void dtrace_vtime_switch(kthread_t *next);
extern void dtrace_vtime_enable_tnf(void);
extern void dtrace_vtime_disable_tnf(void);
extern void dtrace_vtime_enable(void);
extern void dtrace_vtime_disable(void);

struct regs;

#if defined(sun)
extern int (*dtrace_pid_probe_ptr)(struct regs *);
extern int (*dtrace_return_probe_ptr)(struct regs *);
extern void (*dtrace_fasttrap_fork_ptr)(proc_t *, proc_t *);
extern void (*dtrace_fasttrap_exec_ptr)(proc_t *);
extern void (*dtrace_fasttrap_exit_ptr)(proc_t *);
extern void dtrace_fasttrap_fork(proc_t *, proc_t *);
#endif

typedef uintptr_t dtrace_icookie_t;
typedef void (*dtrace_xcall_t)(void *);

extern dtrace_icookie_t dtrace_interrupt_disable(void);
extern void dtrace_interrupt_enable(dtrace_icookie_t);

extern void dtrace_membar_producer(void);
extern void dtrace_membar_consumer(void);

extern void (*dtrace_cpu_init)(processorid_t);
extern void (*dtrace_modload)(modctl_t *);
extern void (*dtrace_modunload)(modctl_t *);
extern void (*dtrace_helpers_cleanup)(void);
extern void (*dtrace_helpers_fork)(proc_t *parent, proc_t *child);
extern void (*dtrace_cpustart_init)(void);
extern void (*dtrace_cpustart_fini)(void);

extern void (*dtrace_debugger_init)(void);
extern void (*dtrace_debugger_fini)(void);
extern dtrace_cacheid_t dtrace_predcache_id;

#if defined(sun)
extern hrtime_t dtrace_gethrtime(void);
#else
void dtrace_debug_printf(const char *, ...) __printflike(1, 2);
#endif
extern void dtrace_sync(void);
extern void dtrace_toxic_ranges(void (*)(uintptr_t, uintptr_t));
extern void dtrace_xcall(processorid_t, dtrace_xcall_t, void *);
extern void dtrace_vpanic(const char *, __va_list);
extern void dtrace_panic(const char *, ...);

extern int dtrace_safe_defer_signal(void);
extern void dtrace_safe_synchronous_signal(void);

extern int dtrace_mach_aframes(void);

#if defined(__i386) || defined(__amd64)
extern int dtrace_instr_size(uchar_t *instr);
extern int dtrace_instr_size_isa(uchar_t *, model_t, int *);
extern void dtrace_invop_add(int (*)(uintptr_t, uintptr_t *, uintptr_t));
extern void dtrace_invop_remove(int (*)(uintptr_t, uintptr_t *, uintptr_t));
extern void dtrace_invop_callsite(void);
#endif

#ifdef __sparc
extern int dtrace_blksuword32(uintptr_t, uint32_t *, int);
extern void dtrace_getfsr(uint64_t *);
#endif

#define DTRACE_CPUFLAG_ISSET(flag) \
        (cpu_core[curcpu].cpuc_dtrace_flags & (flag))

#define DTRACE_CPUFLAG_SET(flag) \
        (cpu_core[curcpu].cpuc_dtrace_flags |= (flag))

#define DTRACE_CPUFLAG_CLEAR(flag) \
        (cpu_core[curcpu].cpuc_dtrace_flags &= ~(flag))

#endif /* _KERNEL */

#endif  /* _ASM */

#if defined(__i386) || defined(__amd64)

#define DTRACE_INVOP_PUSHL_EBP          1
#define DTRACE_INVOP_POPL_EBP           2
#define DTRACE_INVOP_LEAVE              3
#define DTRACE_INVOP_NOP                4
#define DTRACE_INVOP_RET                5

#endif

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_DTRACE_H */