4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
28 * Copyright (c) 2011, Joyent, Inc. All rights reserved.
29 * Copyright (c) 2012 by Delphix. All rights reserved.
35 #pragma ident "%Z%%M% %I% %E% SMI"
42 * DTrace Dynamic Tracing Software: Kernel Interfaces
44 * Note: The contents of this file are private to the implementation of the
45 * Solaris system and DTrace subsystem and are subject to change at any time
46 * without notice. Applications and drivers using these interfaces will fail
47 * to run on future releases. These interfaces should not be used for any
48 * purpose except those expressly outlined in dtrace(7D) and libdtrace(3LIB).
49 * Please refer to the "Solaris Dynamic Tracing Guide" for more information.
54 #include <sys/types.h>
55 #include <sys/modctl.h>
56 #include <sys/processor.h>
58 #include <sys/systm.h>
60 #include <sys/param.h>
61 #include <sys/linker.h>
62 #include <sys/ioccom.h>
63 #include <sys/ucred.h>
66 #include <sys/ctf_api.h>
67 #include <sys/cyclic.h>
69 #include <sys/int_limits.h>
71 #include <sys/stdint.h>
75 * DTrace Universal Constants and Typedefs
77 #define DTRACE_CPUALL -1 /* all CPUs */
78 #define DTRACE_IDNONE 0 /* invalid probe identifier */
79 #define DTRACE_EPIDNONE 0 /* invalid enabled probe identifier */
80 #define DTRACE_AGGIDNONE 0 /* invalid aggregation identifier */
81 #define DTRACE_AGGVARIDNONE 0 /* invalid aggregation variable ID */
82 #define DTRACE_CACHEIDNONE 0 /* invalid predicate cache */
83 #define DTRACE_PROVNONE 0 /* invalid provider identifier */
84 #define DTRACE_METAPROVNONE 0 /* invalid meta-provider identifier */
85 #define DTRACE_ARGNONE -1 /* invalid argument index */
87 #define DTRACE_PROVNAMELEN 64
88 #define DTRACE_MODNAMELEN 64
89 #define DTRACE_FUNCNAMELEN 128
90 #define DTRACE_NAMELEN 64
91 #define DTRACE_FULLNAMELEN (DTRACE_PROVNAMELEN + DTRACE_MODNAMELEN + \
92 DTRACE_FUNCNAMELEN + DTRACE_NAMELEN + 4)
93 #define DTRACE_ARGTYPELEN 128
95 typedef uint32_t dtrace_id_t; /* probe identifier */
96 typedef uint32_t dtrace_epid_t; /* enabled probe identifier */
97 typedef uint32_t dtrace_aggid_t; /* aggregation identifier */
98 typedef int64_t dtrace_aggvarid_t; /* aggregation variable identifier */
99 typedef uint16_t dtrace_actkind_t; /* action kind */
100 typedef int64_t dtrace_optval_t; /* option value */
101 typedef uint32_t dtrace_cacheid_t; /* predicate cache identifier */
103 typedef enum dtrace_probespec {
104 DTRACE_PROBESPEC_NONE = -1,
105 DTRACE_PROBESPEC_PROVIDER = 0,
106 DTRACE_PROBESPEC_MOD,
107 DTRACE_PROBESPEC_FUNC,
108 DTRACE_PROBESPEC_NAME
109 } dtrace_probespec_t;
112 * DTrace Intermediate Format (DIF)
114 * The following definitions describe the DTrace Intermediate Format (DIF), a
115 * a RISC-like instruction set and program encoding used to represent
116 * predicates and actions that can be bound to DTrace probes. The constants
117 * below defining the number of available registers are suggested minimums; the
118 * compiler should use DTRACEIOC_CONF to dynamically obtain the number of
119 * registers provided by the current DTrace implementation.
121 #define DIF_VERSION_1 1 /* DIF version 1: Solaris 10 Beta */
122 #define DIF_VERSION_2 2 /* DIF version 2: Solaris 10 FCS */
123 #define DIF_VERSION DIF_VERSION_2 /* latest DIF instruction set version */
124 #define DIF_DIR_NREGS 8 /* number of DIF integer registers */
125 #define DIF_DTR_NREGS 8 /* number of DIF tuple registers */
127 #define DIF_OP_OR 1 /* or r1, r2, rd */
128 #define DIF_OP_XOR 2 /* xor r1, r2, rd */
129 #define DIF_OP_AND 3 /* and r1, r2, rd */
130 #define DIF_OP_SLL 4 /* sll r1, r2, rd */
131 #define DIF_OP_SRL 5 /* srl r1, r2, rd */
132 #define DIF_OP_SUB 6 /* sub r1, r2, rd */
133 #define DIF_OP_ADD 7 /* add r1, r2, rd */
134 #define DIF_OP_MUL 8 /* mul r1, r2, rd */
135 #define DIF_OP_SDIV 9 /* sdiv r1, r2, rd */
136 #define DIF_OP_UDIV 10 /* udiv r1, r2, rd */
137 #define DIF_OP_SREM 11 /* srem r1, r2, rd */
138 #define DIF_OP_UREM 12 /* urem r1, r2, rd */
139 #define DIF_OP_NOT 13 /* not r1, rd */
140 #define DIF_OP_MOV 14 /* mov r1, rd */
141 #define DIF_OP_CMP 15 /* cmp r1, r2 */
142 #define DIF_OP_TST 16 /* tst r1 */
143 #define DIF_OP_BA 17 /* ba label */
144 #define DIF_OP_BE 18 /* be label */
145 #define DIF_OP_BNE 19 /* bne label */
146 #define DIF_OP_BG 20 /* bg label */
147 #define DIF_OP_BGU 21 /* bgu label */
148 #define DIF_OP_BGE 22 /* bge label */
149 #define DIF_OP_BGEU 23 /* bgeu label */
150 #define DIF_OP_BL 24 /* bl label */
151 #define DIF_OP_BLU 25 /* blu label */
152 #define DIF_OP_BLE 26 /* ble label */
153 #define DIF_OP_BLEU 27 /* bleu label */
154 #define DIF_OP_LDSB 28 /* ldsb [r1], rd */
155 #define DIF_OP_LDSH 29 /* ldsh [r1], rd */
156 #define DIF_OP_LDSW 30 /* ldsw [r1], rd */
157 #define DIF_OP_LDUB 31 /* ldub [r1], rd */
158 #define DIF_OP_LDUH 32 /* lduh [r1], rd */
159 #define DIF_OP_LDUW 33 /* lduw [r1], rd */
160 #define DIF_OP_LDX 34 /* ldx [r1], rd */
161 #define DIF_OP_RET 35 /* ret rd */
162 #define DIF_OP_NOP 36 /* nop */
163 #define DIF_OP_SETX 37 /* setx intindex, rd */
164 #define DIF_OP_SETS 38 /* sets strindex, rd */
165 #define DIF_OP_SCMP 39 /* scmp r1, r2 */
166 #define DIF_OP_LDGA 40 /* ldga var, ri, rd */
167 #define DIF_OP_LDGS 41 /* ldgs var, rd */
168 #define DIF_OP_STGS 42 /* stgs var, rs */
169 #define DIF_OP_LDTA 43 /* ldta var, ri, rd */
170 #define DIF_OP_LDTS 44 /* ldts var, rd */
171 #define DIF_OP_STTS 45 /* stts var, rs */
172 #define DIF_OP_SRA 46 /* sra r1, r2, rd */
173 #define DIF_OP_CALL 47 /* call subr, rd */
174 #define DIF_OP_PUSHTR 48 /* pushtr type, rs, rr */
175 #define DIF_OP_PUSHTV 49 /* pushtv type, rs, rv */
176 #define DIF_OP_POPTS 50 /* popts */
177 #define DIF_OP_FLUSHTS 51 /* flushts */
178 #define DIF_OP_LDGAA 52 /* ldgaa var, rd */
179 #define DIF_OP_LDTAA 53 /* ldtaa var, rd */
180 #define DIF_OP_STGAA 54 /* stgaa var, rs */
181 #define DIF_OP_STTAA 55 /* sttaa var, rs */
182 #define DIF_OP_LDLS 56 /* ldls var, rd */
183 #define DIF_OP_STLS 57 /* stls var, rs */
184 #define DIF_OP_ALLOCS 58 /* allocs r1, rd */
185 #define DIF_OP_COPYS 59 /* copys r1, r2, rd */
186 #define DIF_OP_STB 60 /* stb r1, [rd] */
187 #define DIF_OP_STH 61 /* sth r1, [rd] */
188 #define DIF_OP_STW 62 /* stw r1, [rd] */
189 #define DIF_OP_STX 63 /* stx r1, [rd] */
190 #define DIF_OP_ULDSB 64 /* uldsb [r1], rd */
191 #define DIF_OP_ULDSH 65 /* uldsh [r1], rd */
192 #define DIF_OP_ULDSW 66 /* uldsw [r1], rd */
193 #define DIF_OP_ULDUB 67 /* uldub [r1], rd */
194 #define DIF_OP_ULDUH 68 /* ulduh [r1], rd */
195 #define DIF_OP_ULDUW 69 /* ulduw [r1], rd */
196 #define DIF_OP_ULDX 70 /* uldx [r1], rd */
197 #define DIF_OP_RLDSB 71 /* rldsb [r1], rd */
198 #define DIF_OP_RLDSH 72 /* rldsh [r1], rd */
199 #define DIF_OP_RLDSW 73 /* rldsw [r1], rd */
200 #define DIF_OP_RLDUB 74 /* rldub [r1], rd */
201 #define DIF_OP_RLDUH 75 /* rlduh [r1], rd */
202 #define DIF_OP_RLDUW 76 /* rlduw [r1], rd */
203 #define DIF_OP_RLDX 77 /* rldx [r1], rd */
204 #define DIF_OP_XLATE 78 /* xlate xlrindex, rd */
205 #define DIF_OP_XLARG 79 /* xlarg xlrindex, rd */
207 #define DIF_INTOFF_MAX 0xffff /* highest integer table offset */
208 #define DIF_STROFF_MAX 0xffff /* highest string table offset */
209 #define DIF_REGISTER_MAX 0xff /* highest register number */
210 #define DIF_VARIABLE_MAX 0xffff /* highest variable identifier */
211 #define DIF_SUBROUTINE_MAX 0xffff /* highest subroutine code */
213 #define DIF_VAR_ARRAY_MIN 0x0000 /* lowest numbered array variable */
214 #define DIF_VAR_ARRAY_UBASE 0x0080 /* lowest user-defined array */
215 #define DIF_VAR_ARRAY_MAX 0x00ff /* highest numbered array variable */
217 #define DIF_VAR_OTHER_MIN 0x0100 /* lowest numbered scalar or assc */
218 #define DIF_VAR_OTHER_UBASE 0x0500 /* lowest user-defined scalar or assc */
219 #define DIF_VAR_OTHER_MAX 0xffff /* highest numbered scalar or assc */
221 #define DIF_VAR_ARGS 0x0000 /* arguments array */
222 #define DIF_VAR_REGS 0x0001 /* registers array */
223 #define DIF_VAR_UREGS 0x0002 /* user registers array */
224 #define DIF_VAR_CURTHREAD 0x0100 /* thread pointer */
225 #define DIF_VAR_TIMESTAMP 0x0101 /* timestamp */
226 #define DIF_VAR_VTIMESTAMP 0x0102 /* virtual timestamp */
227 #define DIF_VAR_IPL 0x0103 /* interrupt priority level */
228 #define DIF_VAR_EPID 0x0104 /* enabled probe ID */
229 #define DIF_VAR_ID 0x0105 /* probe ID */
230 #define DIF_VAR_ARG0 0x0106 /* first argument */
231 #define DIF_VAR_ARG1 0x0107 /* second argument */
232 #define DIF_VAR_ARG2 0x0108 /* third argument */
233 #define DIF_VAR_ARG3 0x0109 /* fourth argument */
234 #define DIF_VAR_ARG4 0x010a /* fifth argument */
235 #define DIF_VAR_ARG5 0x010b /* sixth argument */
236 #define DIF_VAR_ARG6 0x010c /* seventh argument */
237 #define DIF_VAR_ARG7 0x010d /* eighth argument */
238 #define DIF_VAR_ARG8 0x010e /* ninth argument */
239 #define DIF_VAR_ARG9 0x010f /* tenth argument */
240 #define DIF_VAR_STACKDEPTH 0x0110 /* stack depth */
241 #define DIF_VAR_CALLER 0x0111 /* caller */
242 #define DIF_VAR_PROBEPROV 0x0112 /* probe provider */
243 #define DIF_VAR_PROBEMOD 0x0113 /* probe module */
244 #define DIF_VAR_PROBEFUNC 0x0114 /* probe function */
245 #define DIF_VAR_PROBENAME 0x0115 /* probe name */
246 #define DIF_VAR_PID 0x0116 /* process ID */
247 #define DIF_VAR_TID 0x0117 /* (per-process) thread ID */
248 #define DIF_VAR_EXECNAME 0x0118 /* name of executable */
249 #define DIF_VAR_ZONENAME 0x0119 /* zone name associated with process */
250 #define DIF_VAR_WALLTIMESTAMP 0x011a /* wall-clock timestamp */
251 #define DIF_VAR_USTACKDEPTH 0x011b /* user-land stack depth */
252 #define DIF_VAR_UCALLER 0x011c /* user-level caller */
253 #define DIF_VAR_PPID 0x011d /* parent process ID */
254 #define DIF_VAR_UID 0x011e /* process user ID */
255 #define DIF_VAR_GID 0x011f /* process group ID */
256 #define DIF_VAR_ERRNO 0x0120 /* thread errno */
257 #define DIF_VAR_EXECARGS 0x0121 /* process arguments */
260 #define DIF_VAR_CPU 0x0200
263 #define DIF_SUBR_RAND 0
264 #define DIF_SUBR_MUTEX_OWNED 1
265 #define DIF_SUBR_MUTEX_OWNER 2
266 #define DIF_SUBR_MUTEX_TYPE_ADAPTIVE 3
267 #define DIF_SUBR_MUTEX_TYPE_SPIN 4
268 #define DIF_SUBR_RW_READ_HELD 5
269 #define DIF_SUBR_RW_WRITE_HELD 6
270 #define DIF_SUBR_RW_ISWRITER 7
271 #define DIF_SUBR_COPYIN 8
272 #define DIF_SUBR_COPYINSTR 9
273 #define DIF_SUBR_SPECULATION 10
274 #define DIF_SUBR_PROGENYOF 11
275 #define DIF_SUBR_STRLEN 12
276 #define DIF_SUBR_COPYOUT 13
277 #define DIF_SUBR_COPYOUTSTR 14
278 #define DIF_SUBR_ALLOCA 15
279 #define DIF_SUBR_BCOPY 16
280 #define DIF_SUBR_COPYINTO 17
281 #define DIF_SUBR_MSGDSIZE 18
282 #define DIF_SUBR_MSGSIZE 19
283 #define DIF_SUBR_GETMAJOR 20
284 #define DIF_SUBR_GETMINOR 21
285 #define DIF_SUBR_DDI_PATHNAME 22
286 #define DIF_SUBR_STRJOIN 23
287 #define DIF_SUBR_LLTOSTR 24
288 #define DIF_SUBR_BASENAME 25
289 #define DIF_SUBR_DIRNAME 26
290 #define DIF_SUBR_CLEANPATH 27
291 #define DIF_SUBR_STRCHR 28
292 #define DIF_SUBR_STRRCHR 29
293 #define DIF_SUBR_STRSTR 30
294 #define DIF_SUBR_STRTOK 31
295 #define DIF_SUBR_SUBSTR 32
296 #define DIF_SUBR_INDEX 33
297 #define DIF_SUBR_RINDEX 34
298 #define DIF_SUBR_HTONS 35
299 #define DIF_SUBR_HTONL 36
300 #define DIF_SUBR_HTONLL 37
301 #define DIF_SUBR_NTOHS 38
302 #define DIF_SUBR_NTOHL 39
303 #define DIF_SUBR_NTOHLL 40
304 #define DIF_SUBR_INET_NTOP 41
305 #define DIF_SUBR_INET_NTOA 42
306 #define DIF_SUBR_INET_NTOA6 43
307 #define DIF_SUBR_TOUPPER 44
308 #define DIF_SUBR_TOLOWER 45
309 #define DIF_SUBR_MEMREF 46
310 #define DIF_SUBR_TYPEREF 47
311 #define DIF_SUBR_SX_SHARED_HELD 48
312 #define DIF_SUBR_SX_EXCLUSIVE_HELD 49
313 #define DIF_SUBR_SX_ISEXCLUSIVE 50
315 #define DIF_SUBR_MAX 50 /* max subroutine value */
317 typedef uint32_t dif_instr_t;
319 #define DIF_INSTR_OP(i) (((i) >> 24) & 0xff)
320 #define DIF_INSTR_R1(i) (((i) >> 16) & 0xff)
321 #define DIF_INSTR_R2(i) (((i) >> 8) & 0xff)
322 #define DIF_INSTR_RD(i) ((i) & 0xff)
323 #define DIF_INSTR_RS(i) ((i) & 0xff)
324 #define DIF_INSTR_LABEL(i) ((i) & 0xffffff)
325 #define DIF_INSTR_VAR(i) (((i) >> 8) & 0xffff)
326 #define DIF_INSTR_INTEGER(i) (((i) >> 8) & 0xffff)
327 #define DIF_INSTR_STRING(i) (((i) >> 8) & 0xffff)
328 #define DIF_INSTR_SUBR(i) (((i) >> 8) & 0xffff)
329 #define DIF_INSTR_TYPE(i) (((i) >> 16) & 0xff)
330 #define DIF_INSTR_XLREF(i) (((i) >> 8) & 0xffff)
332 #define DIF_INSTR_FMT(op, r1, r2, d) \
333 (((op) << 24) | ((r1) << 16) | ((r2) << 8) | (d))
335 #define DIF_INSTR_NOT(r1, d) (DIF_INSTR_FMT(DIF_OP_NOT, r1, 0, d))
336 #define DIF_INSTR_MOV(r1, d) (DIF_INSTR_FMT(DIF_OP_MOV, r1, 0, d))
337 #define DIF_INSTR_CMP(op, r1, r2) (DIF_INSTR_FMT(op, r1, r2, 0))
338 #define DIF_INSTR_TST(r1) (DIF_INSTR_FMT(DIF_OP_TST, r1, 0, 0))
339 #define DIF_INSTR_BRANCH(op, label) (((op) << 24) | (label))
340 #define DIF_INSTR_LOAD(op, r1, d) (DIF_INSTR_FMT(op, r1, 0, d))
341 #define DIF_INSTR_STORE(op, r1, d) (DIF_INSTR_FMT(op, r1, 0, d))
342 #define DIF_INSTR_SETX(i, d) ((DIF_OP_SETX << 24) | ((i) << 8) | (d))
343 #define DIF_INSTR_SETS(s, d) ((DIF_OP_SETS << 24) | ((s) << 8) | (d))
344 #define DIF_INSTR_RET(d) (DIF_INSTR_FMT(DIF_OP_RET, 0, 0, d))
345 #define DIF_INSTR_NOP (DIF_OP_NOP << 24)
346 #define DIF_INSTR_LDA(op, v, r, d) (DIF_INSTR_FMT(op, v, r, d))
347 #define DIF_INSTR_LDV(op, v, d) (((op) << 24) | ((v) << 8) | (d))
348 #define DIF_INSTR_STV(op, v, rs) (((op) << 24) | ((v) << 8) | (rs))
349 #define DIF_INSTR_CALL(s, d) ((DIF_OP_CALL << 24) | ((s) << 8) | (d))
350 #define DIF_INSTR_PUSHTS(op, t, r2, rs) (DIF_INSTR_FMT(op, t, r2, rs))
351 #define DIF_INSTR_POPTS (DIF_OP_POPTS << 24)
352 #define DIF_INSTR_FLUSHTS (DIF_OP_FLUSHTS << 24)
353 #define DIF_INSTR_ALLOCS(r1, d) (DIF_INSTR_FMT(DIF_OP_ALLOCS, r1, 0, d))
354 #define DIF_INSTR_COPYS(r1, r2, d) (DIF_INSTR_FMT(DIF_OP_COPYS, r1, r2, d))
355 #define DIF_INSTR_XLATE(op, r, d) (((op) << 24) | ((r) << 8) | (d))
357 #define DIF_REG_R0 0 /* %r0 is always set to zero */
360 * A DTrace Intermediate Format Type (DIF Type) is used to represent the types
361 * of variables, function and associative array arguments, and the return type
362 * for each DIF object (shown below). It contains a description of the type,
363 * its size in bytes, and a module identifier.
365 typedef struct dtrace_diftype {
366 uint8_t dtdt_kind; /* type kind (see below) */
367 uint8_t dtdt_ckind; /* type kind in CTF */
368 uint8_t dtdt_flags; /* type flags (see below) */
369 uint8_t dtdt_pad; /* reserved for future use */
370 uint32_t dtdt_size; /* type size in bytes (unless string) */
373 #define DIF_TYPE_CTF 0 /* type is a CTF type */
374 #define DIF_TYPE_STRING 1 /* type is a D string */
376 #define DIF_TF_BYREF 0x1 /* type is passed by reference */
379 * A DTrace Intermediate Format variable record is used to describe each of the
380 * variables referenced by a given DIF object. It contains an integer variable
381 * identifier along with variable scope and properties, as shown below. The
382 * size of this structure must be sizeof (int) aligned.
384 typedef struct dtrace_difv {
385 uint32_t dtdv_name; /* variable name index in dtdo_strtab */
386 uint32_t dtdv_id; /* variable reference identifier */
387 uint8_t dtdv_kind; /* variable kind (see below) */
388 uint8_t dtdv_scope; /* variable scope (see below) */
389 uint16_t dtdv_flags; /* variable flags (see below) */
390 dtrace_diftype_t dtdv_type; /* variable type (see above) */
393 #define DIFV_KIND_ARRAY 0 /* variable is an array of quantities */
394 #define DIFV_KIND_SCALAR 1 /* variable is a scalar quantity */
396 #define DIFV_SCOPE_GLOBAL 0 /* variable has global scope */
397 #define DIFV_SCOPE_THREAD 1 /* variable has thread scope */
398 #define DIFV_SCOPE_LOCAL 2 /* variable has local scope */
400 #define DIFV_F_REF 0x1 /* variable is referenced by DIFO */
401 #define DIFV_F_MOD 0x2 /* variable is written by DIFO */
406 * The upper byte determines the class of the action; the low bytes determines
407 * the specific action within that class. The classes of actions are as
410 * [ no class ] <= May record process- or kernel-related data
411 * DTRACEACT_PROC <= Only records process-related data
412 * DTRACEACT_PROC_DESTRUCTIVE <= Potentially destructive to processes
413 * DTRACEACT_KERNEL <= Only records kernel-related data
414 * DTRACEACT_KERNEL_DESTRUCTIVE <= Potentially destructive to the kernel
415 * DTRACEACT_SPECULATIVE <= Speculation-related action
416 * DTRACEACT_AGGREGATION <= Aggregating action
418 #define DTRACEACT_NONE 0 /* no action */
419 #define DTRACEACT_DIFEXPR 1 /* action is DIF expression */
420 #define DTRACEACT_EXIT 2 /* exit() action */
421 #define DTRACEACT_PRINTF 3 /* printf() action */
422 #define DTRACEACT_PRINTA 4 /* printa() action */
423 #define DTRACEACT_LIBACT 5 /* library-controlled action */
424 #define DTRACEACT_TRACEMEM 6 /* tracemem() action */
425 #define DTRACEACT_TRACEMEM_DYNSIZE 7 /* dynamic tracemem() size */
426 #define DTRACEACT_PRINTM 8 /* printm() action (BSD) */
427 #define DTRACEACT_PRINTT 9 /* printt() action (BSD) */
429 #define DTRACEACT_PROC 0x0100
430 #define DTRACEACT_USTACK (DTRACEACT_PROC + 1)
431 #define DTRACEACT_JSTACK (DTRACEACT_PROC + 2)
432 #define DTRACEACT_USYM (DTRACEACT_PROC + 3)
433 #define DTRACEACT_UMOD (DTRACEACT_PROC + 4)
434 #define DTRACEACT_UADDR (DTRACEACT_PROC + 5)
436 #define DTRACEACT_PROC_DESTRUCTIVE 0x0200
437 #define DTRACEACT_STOP (DTRACEACT_PROC_DESTRUCTIVE + 1)
438 #define DTRACEACT_RAISE (DTRACEACT_PROC_DESTRUCTIVE + 2)
439 #define DTRACEACT_SYSTEM (DTRACEACT_PROC_DESTRUCTIVE + 3)
440 #define DTRACEACT_FREOPEN (DTRACEACT_PROC_DESTRUCTIVE + 4)
442 #define DTRACEACT_PROC_CONTROL 0x0300
444 #define DTRACEACT_KERNEL 0x0400
445 #define DTRACEACT_STACK (DTRACEACT_KERNEL + 1)
446 #define DTRACEACT_SYM (DTRACEACT_KERNEL + 2)
447 #define DTRACEACT_MOD (DTRACEACT_KERNEL + 3)
449 #define DTRACEACT_KERNEL_DESTRUCTIVE 0x0500
450 #define DTRACEACT_BREAKPOINT (DTRACEACT_KERNEL_DESTRUCTIVE + 1)
451 #define DTRACEACT_PANIC (DTRACEACT_KERNEL_DESTRUCTIVE + 2)
452 #define DTRACEACT_CHILL (DTRACEACT_KERNEL_DESTRUCTIVE + 3)
454 #define DTRACEACT_SPECULATIVE 0x0600
455 #define DTRACEACT_SPECULATE (DTRACEACT_SPECULATIVE + 1)
456 #define DTRACEACT_COMMIT (DTRACEACT_SPECULATIVE + 2)
457 #define DTRACEACT_DISCARD (DTRACEACT_SPECULATIVE + 3)
459 #define DTRACEACT_CLASS(x) ((x) & 0xff00)
461 #define DTRACEACT_ISDESTRUCTIVE(x) \
462 (DTRACEACT_CLASS(x) == DTRACEACT_PROC_DESTRUCTIVE || \
463 DTRACEACT_CLASS(x) == DTRACEACT_KERNEL_DESTRUCTIVE)
465 #define DTRACEACT_ISSPECULATIVE(x) \
466 (DTRACEACT_CLASS(x) == DTRACEACT_SPECULATIVE)
468 #define DTRACEACT_ISPRINTFLIKE(x) \
469 ((x) == DTRACEACT_PRINTF || (x) == DTRACEACT_PRINTA || \
470 (x) == DTRACEACT_SYSTEM || (x) == DTRACEACT_FREOPEN)
473 * DTrace Aggregating Actions
475 * These are functions f(x) for which the following is true:
477 * f(f(x_0) U f(x_1) U ... U f(x_n)) = f(x_0 U x_1 U ... U x_n)
479 * where x_n is a set of arbitrary data. Aggregating actions are in their own
480 * DTrace action class, DTTRACEACT_AGGREGATION. The macros provided here allow
481 * for easier processing of the aggregation argument and data payload for a few
482 * aggregating actions (notably: quantize(), lquantize(), and ustack()).
484 #define DTRACEACT_AGGREGATION 0x0700
485 #define DTRACEAGG_COUNT (DTRACEACT_AGGREGATION + 1)
486 #define DTRACEAGG_MIN (DTRACEACT_AGGREGATION + 2)
487 #define DTRACEAGG_MAX (DTRACEACT_AGGREGATION + 3)
488 #define DTRACEAGG_AVG (DTRACEACT_AGGREGATION + 4)
489 #define DTRACEAGG_SUM (DTRACEACT_AGGREGATION + 5)
490 #define DTRACEAGG_STDDEV (DTRACEACT_AGGREGATION + 6)
491 #define DTRACEAGG_QUANTIZE (DTRACEACT_AGGREGATION + 7)
492 #define DTRACEAGG_LQUANTIZE (DTRACEACT_AGGREGATION + 8)
493 #define DTRACEAGG_LLQUANTIZE (DTRACEACT_AGGREGATION + 9)
495 #define DTRACEACT_ISAGG(x) \
496 (DTRACEACT_CLASS(x) == DTRACEACT_AGGREGATION)
498 #define DTRACE_QUANTIZE_NBUCKETS \
499 (((sizeof (uint64_t) * NBBY) - 1) * 2 + 1)
501 #define DTRACE_QUANTIZE_ZEROBUCKET ((sizeof (uint64_t) * NBBY) - 1)
503 #define DTRACE_QUANTIZE_BUCKETVAL(buck) \
504 (int64_t)((buck) < DTRACE_QUANTIZE_ZEROBUCKET ? \
505 -(1LL << (DTRACE_QUANTIZE_ZEROBUCKET - 1 - (buck))) : \
506 (buck) == DTRACE_QUANTIZE_ZEROBUCKET ? 0 : \
507 1LL << ((buck) - DTRACE_QUANTIZE_ZEROBUCKET - 1))
509 #define DTRACE_LQUANTIZE_STEPSHIFT 48
510 #define DTRACE_LQUANTIZE_STEPMASK ((uint64_t)UINT16_MAX << 48)
511 #define DTRACE_LQUANTIZE_LEVELSHIFT 32
512 #define DTRACE_LQUANTIZE_LEVELMASK ((uint64_t)UINT16_MAX << 32)
513 #define DTRACE_LQUANTIZE_BASESHIFT 0
514 #define DTRACE_LQUANTIZE_BASEMASK UINT32_MAX
516 #define DTRACE_LQUANTIZE_STEP(x) \
517 (uint16_t)(((x) & DTRACE_LQUANTIZE_STEPMASK) >> \
518 DTRACE_LQUANTIZE_STEPSHIFT)
520 #define DTRACE_LQUANTIZE_LEVELS(x) \
521 (uint16_t)(((x) & DTRACE_LQUANTIZE_LEVELMASK) >> \
522 DTRACE_LQUANTIZE_LEVELSHIFT)
524 #define DTRACE_LQUANTIZE_BASE(x) \
525 (int32_t)(((x) & DTRACE_LQUANTIZE_BASEMASK) >> \
526 DTRACE_LQUANTIZE_BASESHIFT)
528 #define DTRACE_LLQUANTIZE_FACTORSHIFT 48
529 #define DTRACE_LLQUANTIZE_FACTORMASK ((uint64_t)UINT16_MAX << 48)
530 #define DTRACE_LLQUANTIZE_LOWSHIFT 32
531 #define DTRACE_LLQUANTIZE_LOWMASK ((uint64_t)UINT16_MAX << 32)
532 #define DTRACE_LLQUANTIZE_HIGHSHIFT 16
533 #define DTRACE_LLQUANTIZE_HIGHMASK ((uint64_t)UINT16_MAX << 16)
534 #define DTRACE_LLQUANTIZE_NSTEPSHIFT 0
535 #define DTRACE_LLQUANTIZE_NSTEPMASK UINT16_MAX
537 #define DTRACE_LLQUANTIZE_FACTOR(x) \
538 (uint16_t)(((x) & DTRACE_LLQUANTIZE_FACTORMASK) >> \
539 DTRACE_LLQUANTIZE_FACTORSHIFT)
541 #define DTRACE_LLQUANTIZE_LOW(x) \
542 (uint16_t)(((x) & DTRACE_LLQUANTIZE_LOWMASK) >> \
543 DTRACE_LLQUANTIZE_LOWSHIFT)
545 #define DTRACE_LLQUANTIZE_HIGH(x) \
546 (uint16_t)(((x) & DTRACE_LLQUANTIZE_HIGHMASK) >> \
547 DTRACE_LLQUANTIZE_HIGHSHIFT)
549 #define DTRACE_LLQUANTIZE_NSTEP(x) \
550 (uint16_t)(((x) & DTRACE_LLQUANTIZE_NSTEPMASK) >> \
551 DTRACE_LLQUANTIZE_NSTEPSHIFT)
553 #define DTRACE_USTACK_NFRAMES(x) (uint32_t)((x) & UINT32_MAX)
554 #define DTRACE_USTACK_STRSIZE(x) (uint32_t)((x) >> 32)
555 #define DTRACE_USTACK_ARG(x, y) \
556 ((((uint64_t)(y)) << 32) | ((x) & UINT32_MAX))
559 #if BYTE_ORDER == _BIG_ENDIAN
560 #define DTRACE_PTR(type, name) uint32_t name##pad; type *name
562 #define DTRACE_PTR(type, name) type *name; uint32_t name##pad
565 #define DTRACE_PTR(type, name) type *name
569 * DTrace Object Format (DOF)
571 * DTrace programs can be persistently encoded in the DOF format so that they
572 * may be embedded in other programs (for example, in an ELF file) or in the
573 * dtrace driver configuration file for use in anonymous tracing. The DOF
574 * format is versioned and extensible so that it can be revised and so that
575 * internal data structures can be modified or extended compatibly. All DOF
576 * structures use fixed-size types, so the 32-bit and 64-bit representations
577 * are identical and consumers can use either data model transparently.
579 * The file layout is structured as follows:
581 * +---------------+-------------------+----- ... ----+---- ... ------+
582 * | dof_hdr_t | dof_sec_t[ ... ] | loadable | non-loadable |
583 * | (file header) | (section headers) | section data | section data |
584 * +---------------+-------------------+----- ... ----+---- ... ------+
585 * |<------------ dof_hdr.dofh_loadsz --------------->| |
586 * |<------------ dof_hdr.dofh_filesz ------------------------------->|
588 * The file header stores meta-data including a magic number, data model for
589 * the instrumentation, data encoding, and properties of the DIF code within.
590 * The header describes its own size and the size of the section headers. By
591 * convention, an array of section headers follows the file header, and then
592 * the data for all loadable sections and unloadable sections. This permits
593 * consumer code to easily download the headers and all loadable data into the
594 * DTrace driver in one contiguous chunk, omitting other extraneous sections.
596 * The section headers describe the size, offset, alignment, and section type
597 * for each section. Sections are described using a set of #defines that tell
598 * the consumer what kind of data is expected. Sections can contain links to
599 * other sections by storing a dof_secidx_t, an index into the section header
600 * array, inside of the section data structures. The section header includes
601 * an entry size so that sections with data arrays can grow their structures.
603 * The DOF data itself can contain many snippets of DIF (i.e. >1 DIFOs), which
604 * are represented themselves as a collection of related DOF sections. This
605 * permits us to change the set of sections associated with a DIFO over time,
606 * and also permits us to encode DIFOs that contain different sets of sections.
607 * When a DOF section wants to refer to a DIFO, it stores the dof_secidx_t of a
608 * section of type DOF_SECT_DIFOHDR. This section's data is then an array of
609 * dof_secidx_t's which in turn denote the sections associated with this DIFO.
611 * This loose coupling of the file structure (header and sections) to the
612 * structure of the DTrace program itself (ECB descriptions, action
613 * descriptions, and DIFOs) permits activities such as relocation processing
614 * to occur in a single pass without having to understand D program structure.
616 * Finally, strings are always stored in ELF-style string tables along with a
617 * string table section index and string table offset. Therefore strings in
618 * DOF are always arbitrary-length and not bound to the current implementation.
621 #define DOF_ID_SIZE 16 /* total size of dofh_ident[] in bytes */
623 typedef struct dof_hdr {
624 uint8_t dofh_ident[DOF_ID_SIZE]; /* identification bytes (see below) */
625 uint32_t dofh_flags; /* file attribute flags (if any) */
626 uint32_t dofh_hdrsize; /* size of file header in bytes */
627 uint32_t dofh_secsize; /* size of section header in bytes */
628 uint32_t dofh_secnum; /* number of section headers */
629 uint64_t dofh_secoff; /* file offset of section headers */
630 uint64_t dofh_loadsz; /* file size of loadable portion */
631 uint64_t dofh_filesz; /* file size of entire DOF file */
632 uint64_t dofh_pad; /* reserved for future use */
635 #define DOF_ID_MAG0 0 /* first byte of magic number */
636 #define DOF_ID_MAG1 1 /* second byte of magic number */
637 #define DOF_ID_MAG2 2 /* third byte of magic number */
638 #define DOF_ID_MAG3 3 /* fourth byte of magic number */
639 #define DOF_ID_MODEL 4 /* DOF data model (see below) */
640 #define DOF_ID_ENCODING 5 /* DOF data encoding (see below) */
641 #define DOF_ID_VERSION 6 /* DOF file format major version (see below) */
642 #define DOF_ID_DIFVERS 7 /* DIF instruction set version */
643 #define DOF_ID_DIFIREG 8 /* DIF integer registers used by compiler */
644 #define DOF_ID_DIFTREG 9 /* DIF tuple registers used by compiler */
645 #define DOF_ID_PAD 10 /* start of padding bytes (all zeroes) */
647 #define DOF_MAG_MAG0 0x7F /* DOF_ID_MAG[0-3] */
648 #define DOF_MAG_MAG1 'D'
649 #define DOF_MAG_MAG2 'O'
650 #define DOF_MAG_MAG3 'F'
652 #define DOF_MAG_STRING "\177DOF"
653 #define DOF_MAG_STRLEN 4
655 #define DOF_MODEL_NONE 0 /* DOF_ID_MODEL */
656 #define DOF_MODEL_ILP32 1
657 #define DOF_MODEL_LP64 2
660 #define DOF_MODEL_NATIVE DOF_MODEL_LP64
662 #define DOF_MODEL_NATIVE DOF_MODEL_ILP32
665 #define DOF_ENCODE_NONE 0 /* DOF_ID_ENCODING */
666 #define DOF_ENCODE_LSB 1
667 #define DOF_ENCODE_MSB 2
669 #if BYTE_ORDER == _BIG_ENDIAN
670 #define DOF_ENCODE_NATIVE DOF_ENCODE_MSB
672 #define DOF_ENCODE_NATIVE DOF_ENCODE_LSB
675 #define DOF_VERSION_1 1 /* DOF version 1: Solaris 10 FCS */
676 #define DOF_VERSION_2 2 /* DOF version 2: Solaris Express 6/06 */
677 #define DOF_VERSION DOF_VERSION_2 /* Latest DOF version */
679 #define DOF_FL_VALID 0 /* mask of all valid dofh_flags bits */
681 typedef uint32_t dof_secidx_t; /* section header table index type */
682 typedef uint32_t dof_stridx_t; /* string table index type */
684 #define DOF_SECIDX_NONE (-1U) /* null value for section indices */
685 #define DOF_STRIDX_NONE (-1U) /* null value for string indices */
687 typedef struct dof_sec {
688 uint32_t dofs_type; /* section type (see below) */
689 uint32_t dofs_align; /* section data memory alignment */
690 uint32_t dofs_flags; /* section flags (if any) */
691 uint32_t dofs_entsize; /* size of section entry (if table) */
692 uint64_t dofs_offset; /* offset of section data within file */
693 uint64_t dofs_size; /* size of section data in bytes */
696 #define DOF_SECT_NONE 0 /* null section */
697 #define DOF_SECT_COMMENTS 1 /* compiler comments */
698 #define DOF_SECT_SOURCE 2 /* D program source code */
699 #define DOF_SECT_ECBDESC 3 /* dof_ecbdesc_t */
700 #define DOF_SECT_PROBEDESC 4 /* dof_probedesc_t */
701 #define DOF_SECT_ACTDESC 5 /* dof_actdesc_t array */
702 #define DOF_SECT_DIFOHDR 6 /* dof_difohdr_t (variable length) */
703 #define DOF_SECT_DIF 7 /* uint32_t array of byte code */
704 #define DOF_SECT_STRTAB 8 /* string table */
705 #define DOF_SECT_VARTAB 9 /* dtrace_difv_t array */
706 #define DOF_SECT_RELTAB 10 /* dof_relodesc_t array */
707 #define DOF_SECT_TYPTAB 11 /* dtrace_diftype_t array */
708 #define DOF_SECT_URELHDR 12 /* dof_relohdr_t (user relocations) */
709 #define DOF_SECT_KRELHDR 13 /* dof_relohdr_t (kernel relocations) */
710 #define DOF_SECT_OPTDESC 14 /* dof_optdesc_t array */
711 #define DOF_SECT_PROVIDER 15 /* dof_provider_t */
712 #define DOF_SECT_PROBES 16 /* dof_probe_t array */
713 #define DOF_SECT_PRARGS 17 /* uint8_t array (probe arg mappings) */
714 #define DOF_SECT_PROFFS 18 /* uint32_t array (probe arg offsets) */
715 #define DOF_SECT_INTTAB 19 /* uint64_t array */
716 #define DOF_SECT_UTSNAME 20 /* struct utsname */
717 #define DOF_SECT_XLTAB 21 /* dof_xlref_t array */
718 #define DOF_SECT_XLMEMBERS 22 /* dof_xlmember_t array */
719 #define DOF_SECT_XLIMPORT 23 /* dof_xlator_t */
720 #define DOF_SECT_XLEXPORT 24 /* dof_xlator_t */
721 #define DOF_SECT_PREXPORT 25 /* dof_secidx_t array (exported objs) */
722 #define DOF_SECT_PRENOFFS 26 /* uint32_t array (enabled offsets) */
724 #define DOF_SECF_LOAD 1 /* section should be loaded */
726 typedef struct dof_ecbdesc {
727 dof_secidx_t dofe_probes; /* link to DOF_SECT_PROBEDESC */
728 dof_secidx_t dofe_pred; /* link to DOF_SECT_DIFOHDR */
729 dof_secidx_t dofe_actions; /* link to DOF_SECT_ACTDESC */
730 uint32_t dofe_pad; /* reserved for future use */
731 uint64_t dofe_uarg; /* user-supplied library argument */
734 typedef struct dof_probedesc {
735 dof_secidx_t dofp_strtab; /* link to DOF_SECT_STRTAB section */
736 dof_stridx_t dofp_provider; /* provider string */
737 dof_stridx_t dofp_mod; /* module string */
738 dof_stridx_t dofp_func; /* function string */
739 dof_stridx_t dofp_name; /* name string */
740 uint32_t dofp_id; /* probe identifier (or zero) */
743 typedef struct dof_actdesc {
744 dof_secidx_t dofa_difo; /* link to DOF_SECT_DIFOHDR */
745 dof_secidx_t dofa_strtab; /* link to DOF_SECT_STRTAB section */
746 uint32_t dofa_kind; /* action kind (DTRACEACT_* constant) */
747 uint32_t dofa_ntuple; /* number of subsequent tuple actions */
748 uint64_t dofa_arg; /* kind-specific argument */
749 uint64_t dofa_uarg; /* user-supplied argument */
752 typedef struct dof_difohdr {
753 dtrace_diftype_t dofd_rtype; /* return type for this fragment */
754 dof_secidx_t dofd_links[1]; /* variable length array of indices */
757 typedef struct dof_relohdr {
758 dof_secidx_t dofr_strtab; /* link to DOF_SECT_STRTAB for names */
759 dof_secidx_t dofr_relsec; /* link to DOF_SECT_RELTAB for relos */
760 dof_secidx_t dofr_tgtsec; /* link to section we are relocating */
763 typedef struct dof_relodesc {
764 dof_stridx_t dofr_name; /* string name of relocation symbol */
765 uint32_t dofr_type; /* relo type (DOF_RELO_* constant) */
766 uint64_t dofr_offset; /* byte offset for relocation */
767 uint64_t dofr_data; /* additional type-specific data */
770 #define DOF_RELO_NONE 0 /* empty relocation entry */
771 #define DOF_RELO_SETX 1 /* relocate setx value */
773 typedef struct dof_optdesc {
774 uint32_t dofo_option; /* option identifier */
775 dof_secidx_t dofo_strtab; /* string table, if string option */
776 uint64_t dofo_value; /* option value or string index */
779 typedef uint32_t dof_attr_t; /* encoded stability attributes */
781 #define DOF_ATTR(n, d, c) (((n) << 24) | ((d) << 16) | ((c) << 8))
782 #define DOF_ATTR_NAME(a) (((a) >> 24) & 0xff)
783 #define DOF_ATTR_DATA(a) (((a) >> 16) & 0xff)
784 #define DOF_ATTR_CLASS(a) (((a) >> 8) & 0xff)
786 typedef struct dof_provider {
787 dof_secidx_t dofpv_strtab; /* link to DOF_SECT_STRTAB section */
788 dof_secidx_t dofpv_probes; /* link to DOF_SECT_PROBES section */
789 dof_secidx_t dofpv_prargs; /* link to DOF_SECT_PRARGS section */
790 dof_secidx_t dofpv_proffs; /* link to DOF_SECT_PROFFS section */
791 dof_stridx_t dofpv_name; /* provider name string */
792 dof_attr_t dofpv_provattr; /* provider attributes */
793 dof_attr_t dofpv_modattr; /* module attributes */
794 dof_attr_t dofpv_funcattr; /* function attributes */
795 dof_attr_t dofpv_nameattr; /* name attributes */
796 dof_attr_t dofpv_argsattr; /* args attributes */
797 dof_secidx_t dofpv_prenoffs; /* link to DOF_SECT_PRENOFFS section */
800 typedef struct dof_probe {
801 uint64_t dofpr_addr; /* probe base address or offset */
802 dof_stridx_t dofpr_func; /* probe function string */
803 dof_stridx_t dofpr_name; /* probe name string */
804 dof_stridx_t dofpr_nargv; /* native argument type strings */
805 dof_stridx_t dofpr_xargv; /* translated argument type strings */
806 uint32_t dofpr_argidx; /* index of first argument mapping */
807 uint32_t dofpr_offidx; /* index of first offset entry */
808 uint8_t dofpr_nargc; /* native argument count */
809 uint8_t dofpr_xargc; /* translated argument count */
810 uint16_t dofpr_noffs; /* number of offset entries for probe */
811 uint32_t dofpr_enoffidx; /* index of first is-enabled offset */
812 uint16_t dofpr_nenoffs; /* number of is-enabled offsets */
813 uint16_t dofpr_pad1; /* reserved for future use */
814 uint32_t dofpr_pad2; /* reserved for future use */
817 typedef struct dof_xlator {
818 dof_secidx_t dofxl_members; /* link to DOF_SECT_XLMEMBERS section */
819 dof_secidx_t dofxl_strtab; /* link to DOF_SECT_STRTAB section */
820 dof_stridx_t dofxl_argv; /* input parameter type strings */
821 uint32_t dofxl_argc; /* input parameter list length */
822 dof_stridx_t dofxl_type; /* output type string name */
823 dof_attr_t dofxl_attr; /* output stability attributes */
826 typedef struct dof_xlmember {
827 dof_secidx_t dofxm_difo; /* member link to DOF_SECT_DIFOHDR */
828 dof_stridx_t dofxm_name; /* member name */
829 dtrace_diftype_t dofxm_type; /* member type */
832 typedef struct dof_xlref {
833 dof_secidx_t dofxr_xlator; /* link to DOF_SECT_XLATORS section */
834 uint32_t dofxr_member; /* index of referenced dof_xlmember */
835 uint32_t dofxr_argn; /* index of argument for DIF_OP_XLARG */
839 * DTrace Intermediate Format Object (DIFO)
841 * A DIFO is used to store the compiled DIF for a D expression, its return
842 * type, and its string and variable tables. The string table is a single
843 * buffer of character data into which sets instructions and variable
844 * references can reference strings using a byte offset. The variable table
845 * is an array of dtrace_difv_t structures that describe the name and type of
846 * each variable and the id used in the DIF code. This structure is described
847 * above in the DIF section of this header file. The DIFO is used at both
848 * user-level (in the library) and in the kernel, but the structure is never
849 * passed between the two: the DOF structures form the only interface. As a
850 * result, the definition can change depending on the presence of _KERNEL.
852 typedef struct dtrace_difo {
853 dif_instr_t *dtdo_buf; /* instruction buffer */
854 uint64_t *dtdo_inttab; /* integer table (optional) */
855 char *dtdo_strtab; /* string table (optional) */
856 dtrace_difv_t *dtdo_vartab; /* variable table (optional) */
857 uint_t dtdo_len; /* length of instruction buffer */
858 uint_t dtdo_intlen; /* length of integer table */
859 uint_t dtdo_strlen; /* length of string table */
860 uint_t dtdo_varlen; /* length of variable table */
861 dtrace_diftype_t dtdo_rtype; /* return type */
862 uint_t dtdo_refcnt; /* owner reference count */
863 uint_t dtdo_destructive; /* invokes destructive subroutines */
865 dof_relodesc_t *dtdo_kreltab; /* kernel relocations */
866 dof_relodesc_t *dtdo_ureltab; /* user relocations */
867 struct dt_node **dtdo_xlmtab; /* translator references */
868 uint_t dtdo_krelen; /* length of krelo table */
869 uint_t dtdo_urelen; /* length of urelo table */
870 uint_t dtdo_xlmlen; /* length of translator table */
875 * DTrace Enabling Description Structures
877 * When DTrace is tracking the description of a DTrace enabling entity (probe,
878 * predicate, action, ECB, record, etc.), it does so in a description
879 * structure. These structures all end in "desc", and are used at both
880 * user-level and in the kernel -- but (with the exception of
881 * dtrace_probedesc_t) they are never passed between them. Typically,
882 * user-level will use the description structures when assembling an enabling.
883 * It will then distill those description structures into a DOF object (see
884 * above), and send it into the kernel. The kernel will again use the
885 * description structures to create a description of the enabling as it reads
886 * the DOF. When the description is complete, the enabling will be actually
887 * created -- turning it into the structures that represent the enabling
888 * instead of merely describing it. Not surprisingly, the description
889 * structures bear a strong resemblance to the DOF structures that act as their
892 struct dtrace_predicate;
894 typedef struct dtrace_probedesc {
895 dtrace_id_t dtpd_id; /* probe identifier */
896 char dtpd_provider[DTRACE_PROVNAMELEN]; /* probe provider name */
897 char dtpd_mod[DTRACE_MODNAMELEN]; /* probe module name */
898 char dtpd_func[DTRACE_FUNCNAMELEN]; /* probe function name */
899 char dtpd_name[DTRACE_NAMELEN]; /* probe name */
900 } dtrace_probedesc_t;
902 typedef struct dtrace_repldesc {
903 dtrace_probedesc_t dtrpd_match; /* probe descr. to match */
904 dtrace_probedesc_t dtrpd_create; /* probe descr. to create */
907 typedef struct dtrace_preddesc {
908 dtrace_difo_t *dtpdd_difo; /* pointer to DIF object */
909 struct dtrace_predicate *dtpdd_predicate; /* pointer to predicate */
912 typedef struct dtrace_actdesc {
913 dtrace_difo_t *dtad_difo; /* pointer to DIF object */
914 struct dtrace_actdesc *dtad_next; /* next action */
915 dtrace_actkind_t dtad_kind; /* kind of action */
916 uint32_t dtad_ntuple; /* number in tuple */
917 uint64_t dtad_arg; /* action argument */
918 uint64_t dtad_uarg; /* user argument */
919 int dtad_refcnt; /* reference count */
922 typedef struct dtrace_ecbdesc {
923 dtrace_actdesc_t *dted_action; /* action description(s) */
924 dtrace_preddesc_t dted_pred; /* predicate description */
925 dtrace_probedesc_t dted_probe; /* probe description */
926 uint64_t dted_uarg; /* library argument */
927 int dted_refcnt; /* reference count */
931 * DTrace Metadata Description Structures
933 * DTrace separates the trace data stream from the metadata stream. The only
934 * metadata tokens placed in the data stream are the dtrace_rechdr_t (EPID +
935 * timestamp) or (in the case of aggregations) aggregation identifiers. To
936 * determine the structure of the data, DTrace consumers pass the token to the
937 * kernel, and receive in return a corresponding description of the enabled
938 * probe (via the dtrace_eprobedesc structure) or the aggregation (via the
939 * dtrace_aggdesc structure). Both of these structures are expressed in terms
940 * of record descriptions (via the dtrace_recdesc structure) that describe the
941 * exact structure of the data. Some record descriptions may also contain a
942 * format identifier; this additional bit of metadata can be retrieved from the
943 * kernel, for which a format description is returned via the dtrace_fmtdesc
944 * structure. Note that all four of these structures must be bitness-neutral
945 * to allow for a 32-bit DTrace consumer on a 64-bit kernel.
947 typedef struct dtrace_recdesc {
948 dtrace_actkind_t dtrd_action; /* kind of action */
949 uint32_t dtrd_size; /* size of record */
950 uint32_t dtrd_offset; /* offset in ECB's data */
951 uint16_t dtrd_alignment; /* required alignment */
952 uint16_t dtrd_format; /* format, if any */
953 uint64_t dtrd_arg; /* action argument */
954 uint64_t dtrd_uarg; /* user argument */
957 typedef struct dtrace_eprobedesc {
958 dtrace_epid_t dtepd_epid; /* enabled probe ID */
959 dtrace_id_t dtepd_probeid; /* probe ID */
960 uint64_t dtepd_uarg; /* library argument */
961 uint32_t dtepd_size; /* total size */
962 int dtepd_nrecs; /* number of records */
963 dtrace_recdesc_t dtepd_rec[1]; /* records themselves */
964 } dtrace_eprobedesc_t;
966 typedef struct dtrace_aggdesc {
967 DTRACE_PTR(char, dtagd_name); /* not filled in by kernel */
968 dtrace_aggvarid_t dtagd_varid; /* not filled in by kernel */
969 int dtagd_flags; /* not filled in by kernel */
970 dtrace_aggid_t dtagd_id; /* aggregation ID */
971 dtrace_epid_t dtagd_epid; /* enabled probe ID */
972 uint32_t dtagd_size; /* size in bytes */
973 int dtagd_nrecs; /* number of records */
974 uint32_t dtagd_pad; /* explicit padding */
975 dtrace_recdesc_t dtagd_rec[1]; /* record descriptions */
978 typedef struct dtrace_fmtdesc {
979 DTRACE_PTR(char, dtfd_string); /* format string */
980 int dtfd_length; /* length of format string */
981 uint16_t dtfd_format; /* format identifier */
984 #define DTRACE_SIZEOF_EPROBEDESC(desc) \
985 (sizeof (dtrace_eprobedesc_t) + ((desc)->dtepd_nrecs ? \
986 (((desc)->dtepd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
988 #define DTRACE_SIZEOF_AGGDESC(desc) \
989 (sizeof (dtrace_aggdesc_t) + ((desc)->dtagd_nrecs ? \
990 (((desc)->dtagd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
993 * DTrace Option Interface
995 * Run-time DTrace options are set and retrieved via DOF_SECT_OPTDESC sections
996 * in a DOF image. The dof_optdesc structure contains an option identifier and
997 * an option value. The valid option identifiers are found below; the mapping
998 * between option identifiers and option identifying strings is maintained at
999 * user-level. Note that the value of DTRACEOPT_UNSET is such that all of the
1000 * following are potentially valid option values: all positive integers, zero
1001 * and negative one. Some options (notably "bufpolicy" and "bufresize") take
1002 * predefined tokens as their values; these are defined with
1003 * DTRACEOPT_{option}_{token}.
1005 #define DTRACEOPT_BUFSIZE 0 /* buffer size */
1006 #define DTRACEOPT_BUFPOLICY 1 /* buffer policy */
1007 #define DTRACEOPT_DYNVARSIZE 2 /* dynamic variable size */
1008 #define DTRACEOPT_AGGSIZE 3 /* aggregation size */
1009 #define DTRACEOPT_SPECSIZE 4 /* speculation size */
1010 #define DTRACEOPT_NSPEC 5 /* number of speculations */
1011 #define DTRACEOPT_STRSIZE 6 /* string size */
1012 #define DTRACEOPT_CLEANRATE 7 /* dynvar cleaning rate */
1013 #define DTRACEOPT_CPU 8 /* CPU to trace */
1014 #define DTRACEOPT_BUFRESIZE 9 /* buffer resizing policy */
1015 #define DTRACEOPT_GRABANON 10 /* grab anonymous state, if any */
1016 #define DTRACEOPT_FLOWINDENT 11 /* indent function entry/return */
1017 #define DTRACEOPT_QUIET 12 /* only output explicitly traced data */
1018 #define DTRACEOPT_STACKFRAMES 13 /* number of stack frames */
1019 #define DTRACEOPT_USTACKFRAMES 14 /* number of user stack frames */
1020 #define DTRACEOPT_AGGRATE 15 /* aggregation snapshot rate */
1021 #define DTRACEOPT_SWITCHRATE 16 /* buffer switching rate */
1022 #define DTRACEOPT_STATUSRATE 17 /* status rate */
1023 #define DTRACEOPT_DESTRUCTIVE 18 /* destructive actions allowed */
1024 #define DTRACEOPT_STACKINDENT 19 /* output indent for stack traces */
1025 #define DTRACEOPT_RAWBYTES 20 /* always print bytes in raw form */
1026 #define DTRACEOPT_JSTACKFRAMES 21 /* number of jstack() frames */
1027 #define DTRACEOPT_JSTACKSTRSIZE 22 /* size of jstack() string table */
1028 #define DTRACEOPT_AGGSORTKEY 23 /* sort aggregations by key */
1029 #define DTRACEOPT_AGGSORTREV 24 /* reverse-sort aggregations */
1030 #define DTRACEOPT_AGGSORTPOS 25 /* agg. position to sort on */
1031 #define DTRACEOPT_AGGSORTKEYPOS 26 /* agg. key position to sort on */
1032 #define DTRACEOPT_TEMPORAL 27 /* temporally ordered output */
1033 #define DTRACEOPT_MAX 28 /* number of options */
1035 #define DTRACEOPT_UNSET (dtrace_optval_t)-2 /* unset option */
1037 #define DTRACEOPT_BUFPOLICY_RING 0 /* ring buffer */
1038 #define DTRACEOPT_BUFPOLICY_FILL 1 /* fill buffer, then stop */
1039 #define DTRACEOPT_BUFPOLICY_SWITCH 2 /* switch buffers */
1041 #define DTRACEOPT_BUFRESIZE_AUTO 0 /* automatic resizing */
1042 #define DTRACEOPT_BUFRESIZE_MANUAL 1 /* manual resizing */
1045 * DTrace Buffer Interface
1047 * In order to get a snapshot of the principal or aggregation buffer,
1048 * user-level passes a buffer description to the kernel with the dtrace_bufdesc
1049 * structure. This describes which CPU user-level is interested in, and
1050 * where user-level wishes the kernel to snapshot the buffer to (the
1051 * dtbd_data field). The kernel uses the same structure to pass back some
1052 * information regarding the buffer: the size of data actually copied out, the
1053 * number of drops, the number of errors, the offset of the oldest record,
1054 * and the time of the snapshot.
1056 * If the buffer policy is a "switch" policy, taking a snapshot of the
1057 * principal buffer has the additional effect of switching the active and
1058 * inactive buffers. Taking a snapshot of the aggregation buffer _always_ has
1059 * the additional effect of switching the active and inactive buffers.
1061 typedef struct dtrace_bufdesc {
1062 uint64_t dtbd_size; /* size of buffer */
1063 uint32_t dtbd_cpu; /* CPU or DTRACE_CPUALL */
1064 uint32_t dtbd_errors; /* number of errors */
1065 uint64_t dtbd_drops; /* number of drops */
1066 DTRACE_PTR(char, dtbd_data); /* data */
1067 uint64_t dtbd_oldest; /* offset of oldest record */
1068 uint64_t dtbd_timestamp; /* hrtime of snapshot */
1072 * Each record in the buffer (dtbd_data) begins with a header that includes
1073 * the epid and a timestamp. The timestamp is split into two 4-byte parts
1074 * so that we do not require 8-byte alignment.
1076 typedef struct dtrace_rechdr {
1077 dtrace_epid_t dtrh_epid; /* enabled probe id */
1078 uint32_t dtrh_timestamp_hi; /* high bits of hrtime_t */
1079 uint32_t dtrh_timestamp_lo; /* low bits of hrtime_t */
1082 #define DTRACE_RECORD_LOAD_TIMESTAMP(dtrh) \
1083 ((dtrh)->dtrh_timestamp_lo + \
1084 ((uint64_t)(dtrh)->dtrh_timestamp_hi << 32))
1086 #define DTRACE_RECORD_STORE_TIMESTAMP(dtrh, hrtime) { \
1087 (dtrh)->dtrh_timestamp_lo = (uint32_t)hrtime; \
1088 (dtrh)->dtrh_timestamp_hi = hrtime >> 32; \
1094 * The status of DTrace is relayed via the dtrace_status structure. This
1095 * structure contains members to count drops other than the capacity drops
1096 * available via the buffer interface (see above). This consists of dynamic
1097 * drops (including capacity dynamic drops, rinsing drops and dirty drops), and
1098 * speculative drops (including capacity speculative drops, drops due to busy
1099 * speculative buffers and drops due to unavailable speculative buffers).
1100 * Additionally, the status structure contains a field to indicate the number
1101 * of "fill"-policy buffers have been filled and a boolean field to indicate
1102 * that exit() has been called. If the dtst_exiting field is non-zero, no
1103 * further data will be generated until tracing is stopped (at which time any
1104 * enablings of the END action will be processed); if user-level sees that
1105 * this field is non-zero, tracing should be stopped as soon as possible.
1107 typedef struct dtrace_status {
1108 uint64_t dtst_dyndrops; /* dynamic drops */
1109 uint64_t dtst_dyndrops_rinsing; /* dyn drops due to rinsing */
1110 uint64_t dtst_dyndrops_dirty; /* dyn drops due to dirty */
1111 uint64_t dtst_specdrops; /* speculative drops */
1112 uint64_t dtst_specdrops_busy; /* spec drops due to busy */
1113 uint64_t dtst_specdrops_unavail; /* spec drops due to unavail */
1114 uint64_t dtst_errors; /* total errors */
1115 uint64_t dtst_filled; /* number of filled bufs */
1116 uint64_t dtst_stkstroverflows; /* stack string tab overflows */
1117 uint64_t dtst_dblerrors; /* errors in ERROR probes */
1118 char dtst_killed; /* non-zero if killed */
1119 char dtst_exiting; /* non-zero if exit() called */
1120 char dtst_pad[6]; /* pad out to 64-bit align */
1124 * DTrace Configuration
1126 * User-level may need to understand some elements of the kernel DTrace
1127 * configuration in order to generate correct DIF. This information is
1128 * conveyed via the dtrace_conf structure.
1130 typedef struct dtrace_conf {
1131 uint_t dtc_difversion; /* supported DIF version */
1132 uint_t dtc_difintregs; /* # of DIF integer registers */
1133 uint_t dtc_diftupregs; /* # of DIF tuple registers */
1134 uint_t dtc_ctfmodel; /* CTF data model */
1135 uint_t dtc_pad[8]; /* reserved for future use */
1141 * The constants below DTRACEFLT_LIBRARY indicate probe processing faults;
1142 * constants at or above DTRACEFLT_LIBRARY indicate faults in probe
1143 * postprocessing at user-level. Probe processing faults induce an ERROR
1144 * probe and are replicated in unistd.d to allow users' ERROR probes to decode
1145 * the error condition using thse symbolic labels.
1147 #define DTRACEFLT_UNKNOWN 0 /* Unknown fault */
1148 #define DTRACEFLT_BADADDR 1 /* Bad address */
1149 #define DTRACEFLT_BADALIGN 2 /* Bad alignment */
1150 #define DTRACEFLT_ILLOP 3 /* Illegal operation */
1151 #define DTRACEFLT_DIVZERO 4 /* Divide-by-zero */
1152 #define DTRACEFLT_NOSCRATCH 5 /* Out of scratch space */
1153 #define DTRACEFLT_KPRIV 6 /* Illegal kernel access */
1154 #define DTRACEFLT_UPRIV 7 /* Illegal user access */
1155 #define DTRACEFLT_TUPOFLOW 8 /* Tuple stack overflow */
1156 #define DTRACEFLT_BADSTACK 9 /* Bad stack */
1158 #define DTRACEFLT_LIBRARY 1000 /* Library-level fault */
1161 * DTrace Argument Types
1163 * Because it would waste both space and time, argument types do not reside
1164 * with the probe. In order to determine argument types for args[X]
1165 * variables, the D compiler queries for argument types on a probe-by-probe
1166 * basis. (This optimizes for the common case that arguments are either not
1167 * used or used in an untyped fashion.) Typed arguments are specified with a
1168 * string of the type name in the dtragd_native member of the argument
1169 * description structure. Typed arguments may be further translated to types
1170 * of greater stability; the provider indicates such a translated argument by
1171 * filling in the dtargd_xlate member with the string of the translated type.
1172 * Finally, the provider may indicate which argument value a given argument
1173 * maps to by setting the dtargd_mapping member -- allowing a single argument
1174 * to map to multiple args[X] variables.
1176 typedef struct dtrace_argdesc {
1177 dtrace_id_t dtargd_id; /* probe identifier */
1178 int dtargd_ndx; /* arg number (-1 iff none) */
1179 int dtargd_mapping; /* value mapping */
1180 char dtargd_native[DTRACE_ARGTYPELEN]; /* native type name */
1181 char dtargd_xlate[DTRACE_ARGTYPELEN]; /* translated type name */
1185 * DTrace Stability Attributes
1187 * Each DTrace provider advertises the name and data stability of each of its
1188 * probe description components, as well as its architectural dependencies.
1189 * The D compiler can query the provider attributes (dtrace_pattr_t below) in
1190 * order to compute the properties of an input program and report them.
1192 typedef uint8_t dtrace_stability_t; /* stability code (see attributes(5)) */
1193 typedef uint8_t dtrace_class_t; /* architectural dependency class */
1195 #define DTRACE_STABILITY_INTERNAL 0 /* private to DTrace itself */
1196 #define DTRACE_STABILITY_PRIVATE 1 /* private to Sun (see docs) */
1197 #define DTRACE_STABILITY_OBSOLETE 2 /* scheduled for removal */
1198 #define DTRACE_STABILITY_EXTERNAL 3 /* not controlled by Sun */
1199 #define DTRACE_STABILITY_UNSTABLE 4 /* new or rapidly changing */
1200 #define DTRACE_STABILITY_EVOLVING 5 /* less rapidly changing */
1201 #define DTRACE_STABILITY_STABLE 6 /* mature interface from Sun */
1202 #define DTRACE_STABILITY_STANDARD 7 /* industry standard */
1203 #define DTRACE_STABILITY_MAX 7 /* maximum valid stability */
1205 #define DTRACE_CLASS_UNKNOWN 0 /* unknown architectural dependency */
1206 #define DTRACE_CLASS_CPU 1 /* CPU-module-specific */
1207 #define DTRACE_CLASS_PLATFORM 2 /* platform-specific (uname -i) */
1208 #define DTRACE_CLASS_GROUP 3 /* hardware-group-specific (uname -m) */
1209 #define DTRACE_CLASS_ISA 4 /* ISA-specific (uname -p) */
1210 #define DTRACE_CLASS_COMMON 5 /* common to all systems */
1211 #define DTRACE_CLASS_MAX 5 /* maximum valid class */
1213 #define DTRACE_PRIV_NONE 0x0000
1214 #define DTRACE_PRIV_KERNEL 0x0001
1215 #define DTRACE_PRIV_USER 0x0002
1216 #define DTRACE_PRIV_PROC 0x0004
1217 #define DTRACE_PRIV_OWNER 0x0008
1218 #define DTRACE_PRIV_ZONEOWNER 0x0010
1220 #define DTRACE_PRIV_ALL \
1221 (DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER | \
1222 DTRACE_PRIV_PROC | DTRACE_PRIV_OWNER | DTRACE_PRIV_ZONEOWNER)
1224 typedef struct dtrace_ppriv {
1225 uint32_t dtpp_flags; /* privilege flags */
1226 uid_t dtpp_uid; /* user ID */
1227 zoneid_t dtpp_zoneid; /* zone ID */
1230 typedef struct dtrace_attribute {
1231 dtrace_stability_t dtat_name; /* entity name stability */
1232 dtrace_stability_t dtat_data; /* entity data stability */
1233 dtrace_class_t dtat_class; /* entity data dependency */
1234 } dtrace_attribute_t;
1236 typedef struct dtrace_pattr {
1237 dtrace_attribute_t dtpa_provider; /* provider attributes */
1238 dtrace_attribute_t dtpa_mod; /* module attributes */
1239 dtrace_attribute_t dtpa_func; /* function attributes */
1240 dtrace_attribute_t dtpa_name; /* name attributes */
1241 dtrace_attribute_t dtpa_args; /* args[] attributes */
1244 typedef struct dtrace_providerdesc {
1245 char dtvd_name[DTRACE_PROVNAMELEN]; /* provider name */
1246 dtrace_pattr_t dtvd_attr; /* stability attributes */
1247 dtrace_ppriv_t dtvd_priv; /* privileges required */
1248 } dtrace_providerdesc_t;
1251 * DTrace Pseudodevice Interface
1253 * DTrace is controlled through ioctl(2)'s to the in-kernel dtrace:dtrace
1254 * pseudodevice driver. These ioctls comprise the user-kernel interface to
1258 #define DTRACEIOC (('d' << 24) | ('t' << 16) | ('r' << 8))
1259 #define DTRACEIOC_PROVIDER (DTRACEIOC | 1) /* provider query */
1260 #define DTRACEIOC_PROBES (DTRACEIOC | 2) /* probe query */
1261 #define DTRACEIOC_BUFSNAP (DTRACEIOC | 4) /* snapshot buffer */
1262 #define DTRACEIOC_PROBEMATCH (DTRACEIOC | 5) /* match probes */
1263 #define DTRACEIOC_ENABLE (DTRACEIOC | 6) /* enable probes */
1264 #define DTRACEIOC_AGGSNAP (DTRACEIOC | 7) /* snapshot agg. */
1265 #define DTRACEIOC_EPROBE (DTRACEIOC | 8) /* get eprobe desc. */
1266 #define DTRACEIOC_PROBEARG (DTRACEIOC | 9) /* get probe arg */
1267 #define DTRACEIOC_CONF (DTRACEIOC | 10) /* get config. */
1268 #define DTRACEIOC_STATUS (DTRACEIOC | 11) /* get status */
1269 #define DTRACEIOC_GO (DTRACEIOC | 12) /* start tracing */
1270 #define DTRACEIOC_STOP (DTRACEIOC | 13) /* stop tracing */
1271 #define DTRACEIOC_AGGDESC (DTRACEIOC | 15) /* get agg. desc. */
1272 #define DTRACEIOC_FORMAT (DTRACEIOC | 16) /* get format str */
1273 #define DTRACEIOC_DOFGET (DTRACEIOC | 17) /* get DOF */
1274 #define DTRACEIOC_REPLICATE (DTRACEIOC | 18) /* replicate enab */
1276 #define DTRACEIOC_PROVIDER _IOWR('x',1,dtrace_providerdesc_t)
1277 /* provider query */
1278 #define DTRACEIOC_PROBES _IOWR('x',2,dtrace_probedesc_t)
1280 #define DTRACEIOC_BUFSNAP _IOW('x',4,dtrace_bufdesc_t *)
1281 /* snapshot buffer */
1282 #define DTRACEIOC_PROBEMATCH _IOWR('x',5,dtrace_probedesc_t)
1285 void *dof; /* DOF userland address written to driver. */
1286 int n_matched; /* # matches returned by driver. */
1287 } dtrace_enable_io_t;
1288 #define DTRACEIOC_ENABLE _IOWR('x',6,dtrace_enable_io_t)
1290 #define DTRACEIOC_AGGSNAP _IOW('x',7,dtrace_bufdesc_t *)
1292 #define DTRACEIOC_EPROBE _IOW('x',8,dtrace_eprobedesc_t)
1293 /* get eprobe desc. */
1294 #define DTRACEIOC_PROBEARG _IOWR('x',9,dtrace_argdesc_t)
1296 #define DTRACEIOC_CONF _IOR('x',10,dtrace_conf_t)
1298 #define DTRACEIOC_STATUS _IOR('x',11,dtrace_status_t)
1300 #define DTRACEIOC_GO _IOR('x',12,processorid_t)
1302 #define DTRACEIOC_STOP _IOWR('x',13,processorid_t)
1304 #define DTRACEIOC_AGGDESC _IOW('x',15,dtrace_aggdesc_t *)
1305 /* get agg. desc. */
1306 #define DTRACEIOC_FORMAT _IOWR('x',16,dtrace_fmtdesc_t)
1307 /* get format str */
1308 #define DTRACEIOC_DOFGET _IOW('x',17,dof_hdr_t *)
1310 #define DTRACEIOC_REPLICATE _IOW('x',18,dtrace_repldesc_t)
1311 /* replicate enab */
1317 * In general, DTrace establishes probes in processes and takes actions on
1318 * processes without knowing their specific user-level structures. Instead of
1319 * existing in the framework, process-specific knowledge is contained by the
1320 * enabling D program -- which can apply process-specific knowledge by making
1321 * appropriate use of DTrace primitives like copyin() and copyinstr() to
1322 * operate on user-level data. However, there may exist some specific probes
1323 * of particular semantic relevance that the application developer may wish to
1324 * explicitly export. For example, an application may wish to export a probe
1325 * at the point that it begins and ends certain well-defined transactions. In
1326 * addition to providing probes, programs may wish to offer assistance for
1327 * certain actions. For example, in highly dynamic environments (e.g., Java),
1328 * it may be difficult to obtain a stack trace in terms of meaningful symbol
1329 * names (the translation from instruction addresses to corresponding symbol
1330 * names may only be possible in situ); these environments may wish to define
1331 * a series of actions to be applied in situ to obtain a meaningful stack
1334 * These two mechanisms -- user-level statically defined tracing and assisting
1335 * DTrace actions -- are provided via DTrace _helpers_. Helpers are specified
1336 * via DOF, but unlike enabling DOF, helper DOF may contain definitions of
1337 * providers, probes and their arguments. If a helper wishes to provide
1338 * action assistance, probe descriptions and corresponding DIF actions may be
1339 * specified in the helper DOF. For such helper actions, however, the probe
1340 * description describes the specific helper: all DTrace helpers have the
1341 * provider name "dtrace" and the module name "helper", and the name of the
1342 * helper is contained in the function name (for example, the ustack() helper
1343 * is named "ustack"). Any helper-specific name may be contained in the name
1344 * (for example, if a helper were to have a constructor, it might be named
1345 * "dtrace:helper:<helper>:init"). Helper actions are only called when the
1346 * action that they are helping is taken. Helper actions may only return DIF
1347 * expressions, and may only call the following subroutines:
1349 * alloca() <= Allocates memory out of the consumer's scratch space
1350 * bcopy() <= Copies memory to scratch space
1351 * copyin() <= Copies memory from user-level into consumer's scratch
1352 * copyinto() <= Copies memory into a specific location in scratch
1353 * copyinstr() <= Copies a string into a specific location in scratch
1355 * Helper actions may only access the following built-in variables:
1357 * curthread <= Current kthread_t pointer
1358 * tid <= Current thread identifier
1359 * pid <= Current process identifier
1360 * ppid <= Parent process identifier
1361 * uid <= Current user ID
1362 * gid <= Current group ID
1363 * execname <= Current executable name
1364 * zonename <= Current zone name
1366 * Helper actions may not manipulate or allocate dynamic variables, but they
1367 * may have clause-local and statically-allocated global variables. The
1368 * helper action variable state is specific to the helper action -- variables
1369 * used by the helper action may not be accessed outside of the helper
1370 * action, and the helper action may not access variables that like outside
1371 * of it. Helper actions may not load from kernel memory at-large; they are
1372 * restricting to loading current user state (via copyin() and variants) and
1373 * scratch space. As with probe enablings, helper actions are executed in
1374 * program order. The result of the helper action is the result of the last
1375 * executing helper expression.
1377 * Helpers -- composed of either providers/probes or probes/actions (or both)
1378 * -- are added by opening the "helper" minor node, and issuing an ioctl(2)
1379 * (DTRACEHIOC_ADDDOF) that specifies the dof_helper_t structure. This
1380 * encapsulates the name and base address of the user-level library or
1381 * executable publishing the helpers and probes as well as the DOF that
1382 * contains the definitions of those helpers and probes.
1384 * The DTRACEHIOC_ADD and DTRACEHIOC_REMOVE are left in place for legacy
1385 * helpers and should no longer be used. No other ioctls are valid on the
1386 * helper minor node.
1389 #define DTRACEHIOC (('d' << 24) | ('t' << 16) | ('h' << 8))
1390 #define DTRACEHIOC_ADD (DTRACEHIOC | 1) /* add helper */
1391 #define DTRACEHIOC_REMOVE (DTRACEHIOC | 2) /* remove helper */
1392 #define DTRACEHIOC_ADDDOF (DTRACEHIOC | 3) /* add helper DOF */
1394 #define DTRACEHIOC_ADD _IOWR('z', 1, dof_hdr_t)/* add helper */
1395 #define DTRACEHIOC_REMOVE _IOW('z', 2, int) /* remove helper */
1396 #define DTRACEHIOC_ADDDOF _IOWR('z', 3, dof_helper_t)/* add helper DOF */
1399 typedef struct dof_helper {
1400 char dofhp_mod[DTRACE_MODNAMELEN]; /* executable or library name */
1401 uint64_t dofhp_addr; /* base address of object */
1402 uint64_t dofhp_dof; /* address of helper DOF */
1408 #define DTRACEMNR_DTRACE "dtrace" /* node for DTrace ops */
1409 #define DTRACEMNR_HELPER "helper" /* node for helpers */
1410 #define DTRACEMNRN_DTRACE 0 /* minor for DTrace ops */
1411 #define DTRACEMNRN_HELPER 1 /* minor for helpers */
1412 #define DTRACEMNRN_CLONE 2 /* first clone minor */
1417 * DTrace Provider API
1419 * The following functions are implemented by the DTrace framework and are
1420 * used to implement separate in-kernel DTrace providers. Common functions
1421 * are provided in uts/common/os/dtrace.c. ISA-dependent subroutines are
1422 * defined in uts/<isa>/dtrace/dtrace_asm.s or uts/<isa>/dtrace/dtrace_isa.c.
1424 * The provider API has two halves: the API that the providers consume from
1425 * DTrace, and the API that providers make available to DTrace.
1427 * 1 Framework-to-Provider API
1431 * The Framework-to-Provider API is represented by the dtrace_pops structure
1432 * that the provider passes to the framework when registering itself. This
1433 * structure consists of the following members:
1435 * dtps_provide() <-- Provide all probes, all modules
1436 * dtps_provide_module() <-- Provide all probes in specified module
1437 * dtps_enable() <-- Enable specified probe
1438 * dtps_disable() <-- Disable specified probe
1439 * dtps_suspend() <-- Suspend specified probe
1440 * dtps_resume() <-- Resume specified probe
1441 * dtps_getargdesc() <-- Get the argument description for args[X]
1442 * dtps_getargval() <-- Get the value for an argX or args[X] variable
1443 * dtps_usermode() <-- Find out if the probe was fired in user mode
1444 * dtps_destroy() <-- Destroy all state associated with this probe
1446 * 1.2 void dtps_provide(void *arg, const dtrace_probedesc_t *spec)
1450 * Called to indicate that the provider should provide all probes. If the
1451 * specified description is non-NULL, dtps_provide() is being called because
1452 * no probe matched a specified probe -- if the provider has the ability to
1453 * create custom probes, it may wish to create a probe that matches the
1454 * specified description.
1456 * 1.2.2 Arguments and notes
1458 * The first argument is the cookie as passed to dtrace_register(). The
1459 * second argument is a pointer to a probe description that the provider may
1460 * wish to consider when creating custom probes. The provider is expected to
1461 * call back into the DTrace framework via dtrace_probe_create() to create
1462 * any necessary probes. dtps_provide() may be called even if the provider
1463 * has made available all probes; the provider should check the return value
1464 * of dtrace_probe_create() to handle this case. Note that the provider need
1465 * not implement both dtps_provide() and dtps_provide_module(); see
1466 * "Arguments and Notes" for dtrace_register(), below.
1468 * 1.2.3 Return value
1472 * 1.2.4 Caller's context
1474 * dtps_provide() is typically called from open() or ioctl() context, but may
1475 * be called from other contexts as well. The DTrace framework is locked in
1476 * such a way that providers may not register or unregister. This means that
1477 * the provider may not call any DTrace API that affects its registration with
1478 * the framework, including dtrace_register(), dtrace_unregister(),
1479 * dtrace_invalidate(), and dtrace_condense(). However, the context is such
1480 * that the provider may (and indeed, is expected to) call probe-related
1481 * DTrace routines, including dtrace_probe_create(), dtrace_probe_lookup(),
1482 * and dtrace_probe_arg().
1484 * 1.3 void dtps_provide_module(void *arg, modctl_t *mp)
1488 * Called to indicate that the provider should provide all probes in the
1491 * 1.3.2 Arguments and notes
1493 * The first argument is the cookie as passed to dtrace_register(). The
1494 * second argument is a pointer to a modctl structure that indicates the
1495 * module for which probes should be created.
1497 * 1.3.3 Return value
1501 * 1.3.4 Caller's context
1503 * dtps_provide_module() may be called from open() or ioctl() context, but
1504 * may also be called from a module loading context. mod_lock is held, and
1505 * the DTrace framework is locked in such a way that providers may not
1506 * register or unregister. This means that the provider may not call any
1507 * DTrace API that affects its registration with the framework, including
1508 * dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
1509 * dtrace_condense(). However, the context is such that the provider may (and
1510 * indeed, is expected to) call probe-related DTrace routines, including
1511 * dtrace_probe_create(), dtrace_probe_lookup(), and dtrace_probe_arg(). Note
1512 * that the provider need not implement both dtps_provide() and
1513 * dtps_provide_module(); see "Arguments and Notes" for dtrace_register(),
1516 * 1.4 void dtps_enable(void *arg, dtrace_id_t id, void *parg)
1520 * Called to enable the specified probe.
1522 * 1.4.2 Arguments and notes
1524 * The first argument is the cookie as passed to dtrace_register(). The
1525 * second argument is the identifier of the probe to be enabled. The third
1526 * argument is the probe argument as passed to dtrace_probe_create().
1527 * dtps_enable() will be called when a probe transitions from not being
1528 * enabled at all to having one or more ECB. The number of ECBs associated
1529 * with the probe may change without subsequent calls into the provider.
1530 * When the number of ECBs drops to zero, the provider will be explicitly
1531 * told to disable the probe via dtps_disable(). dtrace_probe() should never
1532 * be called for a probe identifier that hasn't been explicitly enabled via
1535 * 1.4.3 Return value
1539 * 1.4.4 Caller's context
1541 * The DTrace framework is locked in such a way that it may not be called
1542 * back into at all. cpu_lock is held. mod_lock is not held and may not
1545 * 1.5 void dtps_disable(void *arg, dtrace_id_t id, void *parg)
1549 * Called to disable the specified probe.
1551 * 1.5.2 Arguments and notes
1553 * The first argument is the cookie as passed to dtrace_register(). The
1554 * second argument is the identifier of the probe to be disabled. The third
1555 * argument is the probe argument as passed to dtrace_probe_create().
1556 * dtps_disable() will be called when a probe transitions from being enabled
1557 * to having zero ECBs. dtrace_probe() should never be called for a probe
1558 * identifier that has been explicitly enabled via dtps_disable().
1560 * 1.5.3 Return value
1564 * 1.5.4 Caller's context
1566 * The DTrace framework is locked in such a way that it may not be called
1567 * back into at all. cpu_lock is held. mod_lock is not held and may not
1570 * 1.6 void dtps_suspend(void *arg, dtrace_id_t id, void *parg)
1574 * Called to suspend the specified enabled probe. This entry point is for
1575 * providers that may need to suspend some or all of their probes when CPUs
1576 * are being powered on or when the boot monitor is being entered for a
1577 * prolonged period of time.
1579 * 1.6.2 Arguments and notes
1581 * The first argument is the cookie as passed to dtrace_register(). The
1582 * second argument is the identifier of the probe to be suspended. The
1583 * third argument is the probe argument as passed to dtrace_probe_create().
1584 * dtps_suspend will only be called on an enabled probe. Providers that
1585 * provide a dtps_suspend entry point will want to take roughly the action
1586 * that it takes for dtps_disable.
1588 * 1.6.3 Return value
1592 * 1.6.4 Caller's context
1594 * Interrupts are disabled. The DTrace framework is in a state such that the
1595 * specified probe cannot be disabled or destroyed for the duration of
1596 * dtps_suspend(). As interrupts are disabled, the provider is afforded
1597 * little latitude; the provider is expected to do no more than a store to
1600 * 1.7 void dtps_resume(void *arg, dtrace_id_t id, void *parg)
1604 * Called to resume the specified enabled probe. This entry point is for
1605 * providers that may need to resume some or all of their probes after the
1606 * completion of an event that induced a call to dtps_suspend().
1608 * 1.7.2 Arguments and notes
1610 * The first argument is the cookie as passed to dtrace_register(). The
1611 * second argument is the identifier of the probe to be resumed. The
1612 * third argument is the probe argument as passed to dtrace_probe_create().
1613 * dtps_resume will only be called on an enabled probe. Providers that
1614 * provide a dtps_resume entry point will want to take roughly the action
1615 * that it takes for dtps_enable.
1617 * 1.7.3 Return value
1621 * 1.7.4 Caller's context
1623 * Interrupts are disabled. The DTrace framework is in a state such that the
1624 * specified probe cannot be disabled or destroyed for the duration of
1625 * dtps_resume(). As interrupts are disabled, the provider is afforded
1626 * little latitude; the provider is expected to do no more than a store to
1629 * 1.8 void dtps_getargdesc(void *arg, dtrace_id_t id, void *parg,
1630 * dtrace_argdesc_t *desc)
1634 * Called to retrieve the argument description for an args[X] variable.
1636 * 1.8.2 Arguments and notes
1638 * The first argument is the cookie as passed to dtrace_register(). The
1639 * second argument is the identifier of the current probe. The third
1640 * argument is the probe argument as passed to dtrace_probe_create(). The
1641 * fourth argument is a pointer to the argument description. This
1642 * description is both an input and output parameter: it contains the
1643 * index of the desired argument in the dtargd_ndx field, and expects
1644 * the other fields to be filled in upon return. If there is no argument
1645 * corresponding to the specified index, the dtargd_ndx field should be set
1646 * to DTRACE_ARGNONE.
1648 * 1.8.3 Return value
1650 * None. The dtargd_ndx, dtargd_native, dtargd_xlate and dtargd_mapping
1651 * members of the dtrace_argdesc_t structure are all output values.
1653 * 1.8.4 Caller's context
1655 * dtps_getargdesc() is called from ioctl() context. mod_lock is held, and
1656 * the DTrace framework is locked in such a way that providers may not
1657 * register or unregister. This means that the provider may not call any
1658 * DTrace API that affects its registration with the framework, including
1659 * dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
1660 * dtrace_condense().
1662 * 1.9 uint64_t dtps_getargval(void *arg, dtrace_id_t id, void *parg,
1663 * int argno, int aframes)
1667 * Called to retrieve a value for an argX or args[X] variable.
1669 * 1.9.2 Arguments and notes
1671 * The first argument is the cookie as passed to dtrace_register(). The
1672 * second argument is the identifier of the current probe. The third
1673 * argument is the probe argument as passed to dtrace_probe_create(). The
1674 * fourth argument is the number of the argument (the X in the example in
1675 * 1.9.1). The fifth argument is the number of stack frames that were used
1676 * to get from the actual place in the code that fired the probe to
1677 * dtrace_probe() itself, the so-called artificial frames. This argument may
1678 * be used to descend an appropriate number of frames to find the correct
1679 * values. If this entry point is left NULL, the dtrace_getarg() built-in
1682 * 1.9.3 Return value
1684 * The value of the argument.
1686 * 1.9.4 Caller's context
1688 * This is called from within dtrace_probe() meaning that interrupts
1689 * are disabled. No locks should be taken within this entry point.
1691 * 1.10 int dtps_usermode(void *arg, dtrace_id_t id, void *parg)
1695 * Called to determine if the probe was fired in a user context.
1697 * 1.10.2 Arguments and notes
1699 * The first argument is the cookie as passed to dtrace_register(). The
1700 * second argument is the identifier of the current probe. The third
1701 * argument is the probe argument as passed to dtrace_probe_create(). This
1702 * entry point must not be left NULL for providers whose probes allow for
1703 * mixed mode tracing, that is to say those probes that can fire during
1704 * kernel- _or_ user-mode execution
1706 * 1.10.3 Return value
1710 * 1.10.4 Caller's context
1712 * This is called from within dtrace_probe() meaning that interrupts
1713 * are disabled. No locks should be taken within this entry point.
1715 * 1.11 void dtps_destroy(void *arg, dtrace_id_t id, void *parg)
1719 * Called to destroy the specified probe.
1721 * 1.11.2 Arguments and notes
1723 * The first argument is the cookie as passed to dtrace_register(). The
1724 * second argument is the identifier of the probe to be destroyed. The third
1725 * argument is the probe argument as passed to dtrace_probe_create(). The
1726 * provider should free all state associated with the probe. The framework
1727 * guarantees that dtps_destroy() is only called for probes that have either
1728 * been disabled via dtps_disable() or were never enabled via dtps_enable().
1729 * Once dtps_disable() has been called for a probe, no further call will be
1730 * made specifying the probe.
1732 * 1.11.3 Return value
1736 * 1.11.4 Caller's context
1738 * The DTrace framework is locked in such a way that it may not be called
1739 * back into at all. mod_lock is held. cpu_lock is not held, and may not be
1743 * 2 Provider-to-Framework API
1747 * The Provider-to-Framework API provides the mechanism for the provider to
1748 * register itself with the DTrace framework, to create probes, to lookup
1749 * probes and (most importantly) to fire probes. The Provider-to-Framework
1752 * dtrace_register() <-- Register a provider with the DTrace framework
1753 * dtrace_unregister() <-- Remove a provider's DTrace registration
1754 * dtrace_invalidate() <-- Invalidate the specified provider
1755 * dtrace_condense() <-- Remove a provider's unenabled probes
1756 * dtrace_attached() <-- Indicates whether or not DTrace has attached
1757 * dtrace_probe_create() <-- Create a DTrace probe
1758 * dtrace_probe_lookup() <-- Lookup a DTrace probe based on its name
1759 * dtrace_probe_arg() <-- Return the probe argument for a specific probe
1760 * dtrace_probe() <-- Fire the specified probe
1762 * 2.2 int dtrace_register(const char *name, const dtrace_pattr_t *pap,
1763 * uint32_t priv, cred_t *cr, const dtrace_pops_t *pops, void *arg,
1764 * dtrace_provider_id_t *idp)
1768 * dtrace_register() registers the calling provider with the DTrace
1769 * framework. It should generally be called by DTrace providers in their
1770 * attach(9E) entry point.
1772 * 2.2.2 Arguments and Notes
1774 * The first argument is the name of the provider. The second argument is a
1775 * pointer to the stability attributes for the provider. The third argument
1776 * is the privilege flags for the provider, and must be some combination of:
1778 * DTRACE_PRIV_NONE <= All users may enable probes from this provider
1780 * DTRACE_PRIV_PROC <= Any user with privilege of PRIV_DTRACE_PROC may
1781 * enable probes from this provider
1783 * DTRACE_PRIV_USER <= Any user with privilege of PRIV_DTRACE_USER may
1784 * enable probes from this provider
1786 * DTRACE_PRIV_KERNEL <= Any user with privilege of PRIV_DTRACE_KERNEL
1787 * may enable probes from this provider
1789 * DTRACE_PRIV_OWNER <= This flag places an additional constraint on
1790 * the privilege requirements above. These probes
1791 * require either (a) a user ID matching the user
1792 * ID of the cred passed in the fourth argument
1793 * or (b) the PRIV_PROC_OWNER privilege.
1795 * DTRACE_PRIV_ZONEOWNER<= This flag places an additional constraint on
1796 * the privilege requirements above. These probes
1797 * require either (a) a zone ID matching the zone
1798 * ID of the cred passed in the fourth argument
1799 * or (b) the PRIV_PROC_ZONE privilege.
1801 * Note that these flags designate the _visibility_ of the probes, not
1802 * the conditions under which they may or may not fire.
1804 * The fourth argument is the credential that is associated with the
1805 * provider. This argument should be NULL if the privilege flags don't
1806 * include DTRACE_PRIV_OWNER or DTRACE_PRIV_ZONEOWNER. If non-NULL, the
1807 * framework stashes the uid and zoneid represented by this credential
1808 * for use at probe-time, in implicit predicates. These limit visibility
1809 * of the probes to users and/or zones which have sufficient privilege to
1812 * The fifth argument is a DTrace provider operations vector, which provides
1813 * the implementation for the Framework-to-Provider API. (See Section 1,
1814 * above.) This must be non-NULL, and each member must be non-NULL. The
1815 * exceptions to this are (1) the dtps_provide() and dtps_provide_module()
1816 * members (if the provider so desires, _one_ of these members may be left
1817 * NULL -- denoting that the provider only implements the other) and (2)
1818 * the dtps_suspend() and dtps_resume() members, which must either both be
1819 * NULL or both be non-NULL.
1821 * The sixth argument is a cookie to be specified as the first argument for
1822 * each function in the Framework-to-Provider API. This argument may have
1825 * The final argument is a pointer to dtrace_provider_id_t. If
1826 * dtrace_register() successfully completes, the provider identifier will be
1827 * stored in the memory pointed to be this argument. This argument must be
1830 * 2.2.3 Return value
1832 * On success, dtrace_register() returns 0 and stores the new provider's
1833 * identifier into the memory pointed to by the idp argument. On failure,
1834 * dtrace_register() returns an errno:
1836 * EINVAL The arguments passed to dtrace_register() were somehow invalid.
1837 * This may because a parameter that must be non-NULL was NULL,
1838 * because the name was invalid (either empty or an illegal
1839 * provider name) or because the attributes were invalid.
1841 * No other failure code is returned.
1843 * 2.2.4 Caller's context
1845 * dtrace_register() may induce calls to dtrace_provide(); the provider must
1846 * hold no locks across dtrace_register() that may also be acquired by
1847 * dtrace_provide(). cpu_lock and mod_lock must not be held.
1849 * 2.3 int dtrace_unregister(dtrace_provider_t id)
1853 * Unregisters the specified provider from the DTrace framework. It should
1854 * generally be called by DTrace providers in their detach(9E) entry point.
1856 * 2.3.2 Arguments and Notes
1858 * The only argument is the provider identifier, as returned from a
1859 * successful call to dtrace_register(). As a result of calling
1860 * dtrace_unregister(), the DTrace framework will call back into the provider
1861 * via the dtps_destroy() entry point. Once dtrace_unregister() successfully
1862 * completes, however, the DTrace framework will no longer make calls through
1863 * the Framework-to-Provider API.
1865 * 2.3.3 Return value
1867 * On success, dtrace_unregister returns 0. On failure, dtrace_unregister()
1870 * EBUSY There are currently processes that have the DTrace pseudodevice
1871 * open, or there exists an anonymous enabling that hasn't yet
1874 * No other failure code is returned.
1876 * 2.3.4 Caller's context
1878 * Because a call to dtrace_unregister() may induce calls through the
1879 * Framework-to-Provider API, the caller may not hold any lock across
1880 * dtrace_register() that is also acquired in any of the Framework-to-
1881 * Provider API functions. Additionally, mod_lock may not be held.
1883 * 2.4 void dtrace_invalidate(dtrace_provider_id_t id)
1887 * Invalidates the specified provider. All subsequent probe lookups for the
1888 * specified provider will fail, but its probes will not be removed.
1890 * 2.4.2 Arguments and note
1892 * The only argument is the provider identifier, as returned from a
1893 * successful call to dtrace_register(). In general, a provider's probes
1894 * always remain valid; dtrace_invalidate() is a mechanism for invalidating
1895 * an entire provider, regardless of whether or not probes are enabled or
1896 * not. Note that dtrace_invalidate() will _not_ prevent already enabled
1897 * probes from firing -- it will merely prevent any new enablings of the
1898 * provider's probes.
1900 * 2.5 int dtrace_condense(dtrace_provider_id_t id)
1904 * Removes all the unenabled probes for the given provider. This function is
1905 * not unlike dtrace_unregister(), except that it doesn't remove the
1906 * provider just as many of its associated probes as it can.
1908 * 2.5.2 Arguments and Notes
1910 * As with dtrace_unregister(), the sole argument is the provider identifier
1911 * as returned from a successful call to dtrace_register(). As a result of
1912 * calling dtrace_condense(), the DTrace framework will call back into the
1913 * given provider's dtps_destroy() entry point for each of the provider's
1916 * 2.5.3 Return value
1918 * Currently, dtrace_condense() always returns 0. However, consumers of this
1919 * function should check the return value as appropriate; its behavior may
1920 * change in the future.
1922 * 2.5.4 Caller's context
1924 * As with dtrace_unregister(), the caller may not hold any lock across
1925 * dtrace_condense() that is also acquired in the provider's entry points.
1926 * Also, mod_lock may not be held.
1928 * 2.6 int dtrace_attached()
1932 * Indicates whether or not DTrace has attached.
1934 * 2.6.2 Arguments and Notes
1936 * For most providers, DTrace makes initial contact beyond registration.
1937 * That is, once a provider has registered with DTrace, it waits to hear
1938 * from DTrace to create probes. However, some providers may wish to
1939 * proactively create probes without first being told by DTrace to do so.
1940 * If providers wish to do this, they must first call dtrace_attached() to
1941 * determine if DTrace itself has attached. If dtrace_attached() returns 0,
1942 * the provider must not make any other Provider-to-Framework API call.
1944 * 2.6.3 Return value
1946 * dtrace_attached() returns 1 if DTrace has attached, 0 otherwise.
1948 * 2.7 int dtrace_probe_create(dtrace_provider_t id, const char *mod,
1949 * const char *func, const char *name, int aframes, void *arg)
1953 * Creates a probe with specified module name, function name, and name.
1955 * 2.7.2 Arguments and Notes
1957 * The first argument is the provider identifier, as returned from a
1958 * successful call to dtrace_register(). The second, third, and fourth
1959 * arguments are the module name, function name, and probe name,
1960 * respectively. Of these, module name and function name may both be NULL
1961 * (in which case the probe is considered to be unanchored), or they may both
1962 * be non-NULL. The name must be non-NULL, and must point to a non-empty
1965 * The fifth argument is the number of artificial stack frames that will be
1966 * found on the stack when dtrace_probe() is called for the new probe. These
1967 * artificial frames will be automatically be pruned should the stack() or
1968 * stackdepth() functions be called as part of one of the probe's ECBs. If
1969 * the parameter doesn't add an artificial frame, this parameter should be
1972 * The final argument is a probe argument that will be passed back to the
1973 * provider when a probe-specific operation is called. (e.g., via
1974 * dtps_enable(), dtps_disable(), etc.)
1976 * Note that it is up to the provider to be sure that the probe that it
1977 * creates does not already exist -- if the provider is unsure of the probe's
1978 * existence, it should assure its absence with dtrace_probe_lookup() before
1979 * calling dtrace_probe_create().
1981 * 2.7.3 Return value
1983 * dtrace_probe_create() always succeeds, and always returns the identifier
1984 * of the newly-created probe.
1986 * 2.7.4 Caller's context
1988 * While dtrace_probe_create() is generally expected to be called from
1989 * dtps_provide() and/or dtps_provide_module(), it may be called from other
1990 * non-DTrace contexts. Neither cpu_lock nor mod_lock may be held.
1992 * 2.8 dtrace_id_t dtrace_probe_lookup(dtrace_provider_t id, const char *mod,
1993 * const char *func, const char *name)
1997 * Looks up a probe based on provdider and one or more of module name,
1998 * function name and probe name.
2000 * 2.8.2 Arguments and Notes
2002 * The first argument is the provider identifier, as returned from a
2003 * successful call to dtrace_register(). The second, third, and fourth
2004 * arguments are the module name, function name, and probe name,
2005 * respectively. Any of these may be NULL; dtrace_probe_lookup() will return
2006 * the identifier of the first probe that is provided by the specified
2007 * provider and matches all of the non-NULL matching criteria.
2008 * dtrace_probe_lookup() is generally used by a provider to be check the
2009 * existence of a probe before creating it with dtrace_probe_create().
2011 * 2.8.3 Return value
2013 * If the probe exists, returns its identifier. If the probe does not exist,
2014 * return DTRACE_IDNONE.
2016 * 2.8.4 Caller's context
2018 * While dtrace_probe_lookup() is generally expected to be called from
2019 * dtps_provide() and/or dtps_provide_module(), it may also be called from
2020 * other non-DTrace contexts. Neither cpu_lock nor mod_lock may be held.
2022 * 2.9 void *dtrace_probe_arg(dtrace_provider_t id, dtrace_id_t probe)
2026 * Returns the probe argument associated with the specified probe.
2028 * 2.9.2 Arguments and Notes
2030 * The first argument is the provider identifier, as returned from a
2031 * successful call to dtrace_register(). The second argument is a probe
2032 * identifier, as returned from dtrace_probe_lookup() or
2033 * dtrace_probe_create(). This is useful if a probe has multiple
2034 * provider-specific components to it: the provider can create the probe
2035 * once with provider-specific state, and then add to the state by looking
2036 * up the probe based on probe identifier.
2038 * 2.9.3 Return value
2040 * Returns the argument associated with the specified probe. If the
2041 * specified probe does not exist, or if the specified probe is not provided
2042 * by the specified provider, NULL is returned.
2044 * 2.9.4 Caller's context
2046 * While dtrace_probe_arg() is generally expected to be called from
2047 * dtps_provide() and/or dtps_provide_module(), it may also be called from
2048 * other non-DTrace contexts. Neither cpu_lock nor mod_lock may be held.
2050 * 2.10 void dtrace_probe(dtrace_id_t probe, uintptr_t arg0, uintptr_t arg1,
2051 * uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
2055 * The epicenter of DTrace: fires the specified probes with the specified
2058 * 2.10.2 Arguments and Notes
2060 * The first argument is a probe identifier as returned by
2061 * dtrace_probe_create() or dtrace_probe_lookup(). The second through sixth
2062 * arguments are the values to which the D variables "arg0" through "arg4"
2065 * dtrace_probe() should be called whenever the specified probe has fired --
2066 * however the provider defines it.
2068 * 2.10.3 Return value
2072 * 2.10.4 Caller's context
2074 * dtrace_probe() may be called in virtually any context: kernel, user,
2075 * interrupt, high-level interrupt, with arbitrary adaptive locks held, with
2076 * dispatcher locks held, with interrupts disabled, etc. The only latitude
2077 * that must be afforded to DTrace is the ability to make calls within
2078 * itself (and to its in-kernel subroutines) and the ability to access
2079 * arbitrary (but mapped) memory. On some platforms, this constrains
2080 * context. For example, on UltraSPARC, dtrace_probe() cannot be called
2081 * from any context in which TL is greater than zero. dtrace_probe() may
2082 * also not be called from any routine which may be called by dtrace_probe()
2083 * -- which includes functions in the DTrace framework and some in-kernel
2084 * DTrace subroutines. All such functions "dtrace_"; providers that
2085 * instrument the kernel arbitrarily should be sure to not instrument these
2088 typedef struct dtrace_pops {
2089 void (*dtps_provide)(void *arg, dtrace_probedesc_t *spec);
2090 void (*dtps_provide_module)(void *arg, modctl_t *mp);
2091 void (*dtps_enable)(void *arg, dtrace_id_t id, void *parg);
2092 void (*dtps_disable)(void *arg, dtrace_id_t id, void *parg);
2093 void (*dtps_suspend)(void *arg, dtrace_id_t id, void *parg);
2094 void (*dtps_resume)(void *arg, dtrace_id_t id, void *parg);
2095 void (*dtps_getargdesc)(void *arg, dtrace_id_t id, void *parg,
2096 dtrace_argdesc_t *desc);
2097 uint64_t (*dtps_getargval)(void *arg, dtrace_id_t id, void *parg,
2098 int argno, int aframes);
2099 int (*dtps_usermode)(void *arg, dtrace_id_t id, void *parg);
2100 void (*dtps_destroy)(void *arg, dtrace_id_t id, void *parg);
2103 typedef uintptr_t dtrace_provider_id_t;
2105 extern int dtrace_register(const char *, const dtrace_pattr_t *, uint32_t,
2106 cred_t *, const dtrace_pops_t *, void *, dtrace_provider_id_t *);
2107 extern int dtrace_unregister(dtrace_provider_id_t);
2108 extern int dtrace_condense(dtrace_provider_id_t);
2109 extern void dtrace_invalidate(dtrace_provider_id_t);
2110 extern dtrace_id_t dtrace_probe_lookup(dtrace_provider_id_t, char *,
2112 extern dtrace_id_t dtrace_probe_create(dtrace_provider_id_t, const char *,
2113 const char *, const char *, int, void *);
2114 extern void *dtrace_probe_arg(dtrace_provider_id_t, dtrace_id_t);
2115 extern void dtrace_probe(dtrace_id_t, uintptr_t arg0, uintptr_t arg1,
2116 uintptr_t arg2, uintptr_t arg3, uintptr_t arg4);
2119 * DTrace Meta Provider API
2121 * The following functions are implemented by the DTrace framework and are
2122 * used to implement meta providers. Meta providers plug into the DTrace
2123 * framework and are used to instantiate new providers on the fly. At
2124 * present, there is only one type of meta provider and only one meta
2125 * provider may be registered with the DTrace framework at a time. The
2126 * sole meta provider type provides user-land static tracing facilities
2127 * by taking meta probe descriptions and adding a corresponding provider
2128 * into the DTrace framework.
2130 * 1 Framework-to-Provider
2134 * The Framework-to-Provider API is represented by the dtrace_mops structure
2135 * that the meta provider passes to the framework when registering itself as
2136 * a meta provider. This structure consists of the following members:
2138 * dtms_create_probe() <-- Add a new probe to a created provider
2139 * dtms_provide_pid() <-- Create a new provider for a given process
2140 * dtms_remove_pid() <-- Remove a previously created provider
2142 * 1.2 void dtms_create_probe(void *arg, void *parg,
2143 * dtrace_helper_probedesc_t *probedesc);
2147 * Called by the DTrace framework to create a new probe in a provider
2148 * created by this meta provider.
2150 * 1.2.2 Arguments and notes
2152 * The first argument is the cookie as passed to dtrace_meta_register().
2153 * The second argument is the provider cookie for the associated provider;
2154 * this is obtained from the return value of dtms_provide_pid(). The third
2155 * argument is the helper probe description.
2157 * 1.2.3 Return value
2161 * 1.2.4 Caller's context
2163 * dtms_create_probe() is called from either ioctl() or module load context.
2164 * The DTrace framework is locked in such a way that meta providers may not
2165 * register or unregister. This means that the meta provider cannot call
2166 * dtrace_meta_register() or dtrace_meta_unregister(). However, the context is
2167 * such that the provider may (and is expected to) call provider-related
2168 * DTrace provider APIs including dtrace_probe_create().
2170 * 1.3 void *dtms_provide_pid(void *arg, dtrace_meta_provider_t *mprov,
2175 * Called by the DTrace framework to instantiate a new provider given the
2176 * description of the provider and probes in the mprov argument. The
2177 * meta provider should call dtrace_register() to insert the new provider
2178 * into the DTrace framework.
2180 * 1.3.2 Arguments and notes
2182 * The first argument is the cookie as passed to dtrace_meta_register().
2183 * The second argument is a pointer to a structure describing the new
2184 * helper provider. The third argument is the process identifier for
2185 * process associated with this new provider. Note that the name of the
2186 * provider as passed to dtrace_register() should be the contatenation of
2187 * the dtmpb_provname member of the mprov argument and the processs
2188 * identifier as a string.
2190 * 1.3.3 Return value
2192 * The cookie for the provider that the meta provider creates. This is
2193 * the same value that it passed to dtrace_register().
2195 * 1.3.4 Caller's context
2197 * dtms_provide_pid() is called from either ioctl() or module load context.
2198 * The DTrace framework is locked in such a way that meta providers may not
2199 * register or unregister. This means that the meta provider cannot call
2200 * dtrace_meta_register() or dtrace_meta_unregister(). However, the context
2201 * is such that the provider may -- and is expected to -- call
2202 * provider-related DTrace provider APIs including dtrace_register().
2204 * 1.4 void dtms_remove_pid(void *arg, dtrace_meta_provider_t *mprov,
2209 * Called by the DTrace framework to remove a provider that had previously
2210 * been instantiated via the dtms_provide_pid() entry point. The meta
2211 * provider need not remove the provider immediately, but this entry
2212 * point indicates that the provider should be removed as soon as possible
2213 * using the dtrace_unregister() API.
2215 * 1.4.2 Arguments and notes
2217 * The first argument is the cookie as passed to dtrace_meta_register().
2218 * The second argument is a pointer to a structure describing the helper
2219 * provider. The third argument is the process identifier for process
2220 * associated with this new provider.
2222 * 1.4.3 Return value
2226 * 1.4.4 Caller's context
2228 * dtms_remove_pid() is called from either ioctl() or exit() context.
2229 * The DTrace framework is locked in such a way that meta providers may not
2230 * register or unregister. This means that the meta provider cannot call
2231 * dtrace_meta_register() or dtrace_meta_unregister(). However, the context
2232 * is such that the provider may -- and is expected to -- call
2233 * provider-related DTrace provider APIs including dtrace_unregister().
2235 typedef struct dtrace_helper_probedesc {
2236 char *dthpb_mod; /* probe module */
2237 char *dthpb_func; /* probe function */
2238 char *dthpb_name; /* probe name */
2239 uint64_t dthpb_base; /* base address */
2240 uint32_t *dthpb_offs; /* offsets array */
2241 uint32_t *dthpb_enoffs; /* is-enabled offsets array */
2242 uint32_t dthpb_noffs; /* offsets count */
2243 uint32_t dthpb_nenoffs; /* is-enabled offsets count */
2244 uint8_t *dthpb_args; /* argument mapping array */
2245 uint8_t dthpb_xargc; /* translated argument count */
2246 uint8_t dthpb_nargc; /* native argument count */
2247 char *dthpb_xtypes; /* translated types strings */
2248 char *dthpb_ntypes; /* native types strings */
2249 } dtrace_helper_probedesc_t;
2251 typedef struct dtrace_helper_provdesc {
2252 char *dthpv_provname; /* provider name */
2253 dtrace_pattr_t dthpv_pattr; /* stability attributes */
2254 } dtrace_helper_provdesc_t;
2256 typedef struct dtrace_mops {
2257 void (*dtms_create_probe)(void *, void *, dtrace_helper_probedesc_t *);
2258 void *(*dtms_provide_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
2259 void (*dtms_remove_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
2262 typedef uintptr_t dtrace_meta_provider_id_t;
2264 extern int dtrace_meta_register(const char *, const dtrace_mops_t *, void *,
2265 dtrace_meta_provider_id_t *);
2266 extern int dtrace_meta_unregister(dtrace_meta_provider_id_t);
2269 * DTrace Kernel Hooks
2271 * The following functions are implemented by the base kernel and form a set of
2272 * hooks used by the DTrace framework. DTrace hooks are implemented in either
2273 * uts/common/os/dtrace_subr.c, an ISA-specific assembly file, or in a
2274 * uts/<platform>/os/dtrace_subr.c corresponding to each hardware platform.
2277 typedef enum dtrace_vtime_state {
2278 DTRACE_VTIME_INACTIVE = 0, /* No DTrace, no TNF */
2279 DTRACE_VTIME_ACTIVE, /* DTrace virtual time, no TNF */
2280 DTRACE_VTIME_INACTIVE_TNF, /* No DTrace, TNF active */
2281 DTRACE_VTIME_ACTIVE_TNF /* DTrace virtual time _and_ TNF */
2282 } dtrace_vtime_state_t;
2285 extern dtrace_vtime_state_t dtrace_vtime_active;
2287 extern void dtrace_vtime_switch(kthread_t *next);
2288 extern void dtrace_vtime_enable_tnf(void);
2289 extern void dtrace_vtime_disable_tnf(void);
2290 extern void dtrace_vtime_enable(void);
2291 extern void dtrace_vtime_disable(void);
2297 extern int (*dtrace_pid_probe_ptr)(struct reg *);
2298 extern int (*dtrace_return_probe_ptr)(struct reg *);
2299 extern void (*dtrace_fasttrap_fork_ptr)(proc_t *, proc_t *);
2300 extern void (*dtrace_fasttrap_exec_ptr)(proc_t *);
2301 extern void (*dtrace_fasttrap_exit_ptr)(proc_t *);
2302 extern void dtrace_fasttrap_fork(proc_t *, proc_t *);
2305 typedef uintptr_t dtrace_icookie_t;
2306 typedef void (*dtrace_xcall_t)(void *);
2308 extern dtrace_icookie_t dtrace_interrupt_disable(void);
2309 extern void dtrace_interrupt_enable(dtrace_icookie_t);
2311 extern void dtrace_membar_producer(void);
2312 extern void dtrace_membar_consumer(void);
2314 extern void (*dtrace_cpu_init)(processorid_t);
2316 extern void (*dtrace_modload)(modctl_t *);
2317 extern void (*dtrace_modunload)(modctl_t *);
2319 extern void (*dtrace_helpers_cleanup)(void);
2320 extern void (*dtrace_helpers_fork)(proc_t *parent, proc_t *child);
2321 extern void (*dtrace_cpustart_init)(void);
2322 extern void (*dtrace_cpustart_fini)(void);
2324 extern void (*dtrace_debugger_init)(void);
2325 extern void (*dtrace_debugger_fini)(void);
2326 extern dtrace_cacheid_t dtrace_predcache_id;
2329 extern hrtime_t dtrace_gethrtime(void);
2331 void dtrace_debug_printf(const char *, ...) __printflike(1, 2);
2333 extern void dtrace_sync(void);
2334 extern void dtrace_toxic_ranges(void (*)(uintptr_t, uintptr_t));
2335 extern void dtrace_xcall(processorid_t, dtrace_xcall_t, void *);
2336 extern void dtrace_vpanic(const char *, __va_list);
2337 extern void dtrace_panic(const char *, ...);
2339 extern int dtrace_safe_defer_signal(void);
2340 extern void dtrace_safe_synchronous_signal(void);
2342 extern int dtrace_mach_aframes(void);
2344 #if defined(__i386) || defined(__amd64)
2345 extern int dtrace_instr_size(uchar_t *instr);
2346 extern int dtrace_instr_size_isa(uchar_t *, model_t, int *);
2347 extern void dtrace_invop_callsite(void);
2349 extern void dtrace_invop_add(int (*)(uintptr_t, uintptr_t *, uintptr_t));
2350 extern void dtrace_invop_remove(int (*)(uintptr_t, uintptr_t *, uintptr_t));
2353 extern int dtrace_blksuword32(uintptr_t, uint32_t *, int);
2354 extern void dtrace_getfsr(uint64_t *);
2358 extern void dtrace_helpers_duplicate(proc_t *, proc_t *);
2359 extern void dtrace_helpers_destroy(proc_t *);
2362 #define DTRACE_CPUFLAG_ISSET(flag) \
2363 (cpu_core[curcpu].cpuc_dtrace_flags & (flag))
2365 #define DTRACE_CPUFLAG_SET(flag) \
2366 (cpu_core[curcpu].cpuc_dtrace_flags |= (flag))
2368 #define DTRACE_CPUFLAG_CLEAR(flag) \
2369 (cpu_core[curcpu].cpuc_dtrace_flags &= ~(flag))
2371 #endif /* _KERNEL */
2375 #if defined(__i386) || defined(__amd64)
2377 #define DTRACE_INVOP_PUSHL_EBP 1
2378 #define DTRACE_INVOP_POPL_EBP 2
2379 #define DTRACE_INVOP_LEAVE 3
2380 #define DTRACE_INVOP_NOP 4
2381 #define DTRACE_INVOP_RET 5
2383 #elif defined(__powerpc__)
2385 #define DTRACE_INVOP_RET 1
2386 #define DTRACE_INVOP_BCTR 2
2387 #define DTRACE_INVOP_BLR 3
2388 #define DTRACE_INVOP_JUMP 4
2389 #define DTRACE_INVOP_MFLR_R0 5
2390 #define DTRACE_INVOP_NOP 6
2398 #endif /* _SYS_DTRACE_H */
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