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amd64: allow gdb(4) to write to most registers
[FreeBSD/FreeBSD.git] / sys / amd64 / include / profile.h
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1992, 1993
5  *      The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *      @(#)profile.h   8.1 (Berkeley) 6/11/93
32  * $FreeBSD$
33  */
34
35 #ifndef _MACHINE_PROFILE_H_
36 #define _MACHINE_PROFILE_H_
37
38 #ifndef _SYS_CDEFS_H_
39 #error this file needs sys/cdefs.h as a prerequisite
40 #endif
41
42 #ifdef _KERNEL
43
44 /*
45  * Config generates something to tell the compiler to align functions on 16
46  * byte boundaries.  A strict alignment is good for keeping the tables small.
47  */
48 #define FUNCTION_ALIGNMENT      16
49
50 /*
51  * The kernel uses assembler stubs instead of unportable inlines.
52  * This is mainly to save a little time when profiling is not enabled,
53  * which is the usual case for the kernel.
54  */
55 #define _MCOUNT_DECL void mcount
56 #define MCOUNT
57
58 #ifdef GUPROF
59 #define MCOUNT_DECL(s)
60 #define MCOUNT_ENTER(s)
61 #define MCOUNT_EXIT(s)
62 #ifdef __GNUCLIKE_ASM
63 #define MCOUNT_OVERHEAD(label)                                          \
64         __asm __volatile("pushq %0; call __mcount; popq %%rcx"          \
65                          :                                              \
66                          : "i" (label)                                  \
67                          : "cx", "r10", "r11", "memory")
68 #define MEXITCOUNT_OVERHEAD()                                           \
69         __asm __volatile("call .mexitcount; 1:"                         \
70                          : :                                            \
71                          : "r10", "r11", "memory")
72 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp)                            \
73         __asm __volatile("movq $1b,%0" : "=rm" (labelp))
74 #else
75 #error this file needs to be ported to your compiler
76 #endif /* !__GNUCLIKE_ASM */
77 #else /* !GUPROF */
78 #define MCOUNT_DECL(s)  register_t s;
79 #ifdef SMP
80 extern int      mcount_lock;
81 #define MCOUNT_ENTER(s) { s = intr_disable(); \
82                           while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
83                                 /* nothing */ ; }
84 #define MCOUNT_EXIT(s)  { atomic_store_rel_int(&mcount_lock, 0); \
85                           intr_restore(s); }
86 #else
87 #define MCOUNT_ENTER(s) { s = intr_disable(); }
88 #define MCOUNT_EXIT(s)  (intr_restore(s))
89 #endif
90 #endif /* GUPROF */
91
92 void bintr(void);
93 void btrap(void);
94 void eintr(void);
95 void user(void);
96
97 #define MCOUNT_FROMPC_USER(pc)                                  \
98         ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
99
100 #define MCOUNT_FROMPC_INTR(pc)                                  \
101         ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ?  \
102             ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr :    \
103                 (uintfptr_t)btrap) : ~0UL)
104
105 #else /* !_KERNEL */
106
107 #define FUNCTION_ALIGNMENT      4
108
109 #define _MCOUNT_DECL \
110 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
111 static void _mcount
112
113 #ifdef __GNUCLIKE_ASM
114 #define MCOUNT __asm("                  \n\
115         .text                           \n\
116         .p2align 4,0x90                 \n\
117         .globl  .mcount                 \n\
118         .type   .mcount,@function       \n\
119 .mcount:                                \n\
120         pushq   %rdi                    \n\
121         pushq   %rsi                    \n\
122         pushq   %rdx                    \n\
123         pushq   %rcx                    \n\
124         pushq   %r8                     \n\
125         pushq   %r9                     \n\
126         pushq   %rax                    \n\
127         movq    8(%rbp),%rdi            \n\
128         movq    7*8(%rsp),%rsi          \n\
129         call    _mcount                 \n\
130         popq    %rax                    \n\
131         popq    %r9                     \n\
132         popq    %r8                     \n\
133         popq    %rcx                    \n\
134         popq    %rdx                    \n\
135         popq    %rsi                    \n\
136         popq    %rdi                    \n\
137         ret                             \n\
138         .size   .mcount, . - .mcount");
139 #if 0
140 /*
141  * We could use this, except it doesn't preserve the registers that were
142  * being passed with arguments to the function that we were inserted
143  * into.  I've left it here as documentation of what the code above is
144  * supposed to do.
145  */
146 #define MCOUNT                                                          \
147 void                                                                    \
148 mcount()                                                                \
149 {                                                                       \
150         uintfptr_t selfpc, frompc;                                      \
151         /*                                                              \
152          * Find the return address for mcount,                          \
153          * and the return address for mcount's caller.                  \
154          *                                                              \
155          * selfpc = pc pushed by call to mcount                         \
156          */                                                             \
157         __asm("movq 8(%%rbp),%0" : "=r" (selfpc));                      \
158         /*                                                              \
159          * frompc = pc pushed by call to mcount's caller.               \
160          * The caller's stack frame has already been built, so %rbp is  \
161          * the caller's frame pointer.  The caller's raddr is in the    \
162          * caller's frame following the caller's caller's frame pointer.\
163          */                                                             \
164         __asm("movq (%%rbp),%0" : "=r" (frompc));                       \
165         frompc = ((uintfptr_t *)frompc)[1];                             \
166         _mcount(frompc, selfpc);                                        \
167 }
168 #endif
169 #else /* !__GNUCLIKE_ASM */
170 #define MCOUNT
171 #endif /* __GNUCLIKE_ASM */
172
173 typedef u_long  uintfptr_t;
174
175 #endif /* _KERNEL */
176
177 /*
178  * An unsigned integral type that can hold non-negative difference between
179  * function pointers.
180  */
181 typedef u_long  fptrdiff_t;
182
183 #ifdef _KERNEL
184
185 void    mcount(uintfptr_t frompc, uintfptr_t selfpc);
186
187 #else /* !_KERNEL */
188
189 #include <sys/cdefs.h>
190
191 __BEGIN_DECLS
192 #ifdef __GNUCLIKE_ASM
193 void    mcount(void) __asm(".mcount");
194 #endif
195 __END_DECLS
196
197 #endif /* _KERNEL */
198
199 #endif /* !_MACHINE_PROFILE_H_ */