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comparison gcc/config/i386/linux-unwind.h @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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children 77e2b8dfacca
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-1:000000000000 0:a06113de4d67
1 /* DWARF2 EH unwinding support for AMD x86-64 and x86.
2 Copyright (C) 2004, 2005, 2006, 2009 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 Under Section 7 of GPL version 3, you are granted additional
17 permissions described in the GCC Runtime Library Exception, version
18 3.1, as published by the Free Software Foundation.
19
20 You should have received a copy of the GNU General Public License and
21 a copy of the GCC Runtime Library Exception along with this program;
22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 <http://www.gnu.org/licenses/>. */
24
25 /* Do code reading to identify a signal frame, and set the frame
26 state data appropriately. See unwind-dw2.c for the structs.
27 Don't use this at all if inhibit_libc is used. */
28
29 #ifndef inhibit_libc
30
31 #ifdef __x86_64__
32
33 #include <signal.h>
34 #include <sys/ucontext.h>
35
36 #define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state
37
38 static _Unwind_Reason_Code
39 x86_64_fallback_frame_state (struct _Unwind_Context *context,
40 _Unwind_FrameState *fs)
41 {
42 unsigned char *pc = context->ra;
43 struct sigcontext *sc;
44 long new_cfa;
45
46 /* movq __NR_rt_sigreturn, %rax ; syscall */
47 if (*(unsigned char *)(pc+0) == 0x48
48 && *(unsigned long *)(pc+1) == 0x050f0000000fc0c7)
49 {
50 struct ucontext *uc_ = context->cfa;
51 /* The void * cast is necessary to avoid an aliasing warning.
52 The aliasing warning is correct, but should not be a problem
53 because it does not alias anything. */
54 sc = (struct sigcontext *) (void *) &uc_->uc_mcontext;
55 }
56 else
57 return _URC_END_OF_STACK;
58
59 new_cfa = sc->rsp;
60 fs->regs.cfa_how = CFA_REG_OFFSET;
61 /* Register 7 is rsp */
62 fs->regs.cfa_reg = 7;
63 fs->regs.cfa_offset = new_cfa - (long) context->cfa;
64
65 /* The SVR4 register numbering macros aren't usable in libgcc. */
66 fs->regs.reg[0].how = REG_SAVED_OFFSET;
67 fs->regs.reg[0].loc.offset = (long)&sc->rax - new_cfa;
68 fs->regs.reg[1].how = REG_SAVED_OFFSET;
69 fs->regs.reg[1].loc.offset = (long)&sc->rdx - new_cfa;
70 fs->regs.reg[2].how = REG_SAVED_OFFSET;
71 fs->regs.reg[2].loc.offset = (long)&sc->rcx - new_cfa;
72 fs->regs.reg[3].how = REG_SAVED_OFFSET;
73 fs->regs.reg[3].loc.offset = (long)&sc->rbx - new_cfa;
74 fs->regs.reg[4].how = REG_SAVED_OFFSET;
75 fs->regs.reg[4].loc.offset = (long)&sc->rsi - new_cfa;
76 fs->regs.reg[5].how = REG_SAVED_OFFSET;
77 fs->regs.reg[5].loc.offset = (long)&sc->rdi - new_cfa;
78 fs->regs.reg[6].how = REG_SAVED_OFFSET;
79 fs->regs.reg[6].loc.offset = (long)&sc->rbp - new_cfa;
80 fs->regs.reg[8].how = REG_SAVED_OFFSET;
81 fs->regs.reg[8].loc.offset = (long)&sc->r8 - new_cfa;
82 fs->regs.reg[9].how = REG_SAVED_OFFSET;
83 fs->regs.reg[9].loc.offset = (long)&sc->r9 - new_cfa;
84 fs->regs.reg[10].how = REG_SAVED_OFFSET;
85 fs->regs.reg[10].loc.offset = (long)&sc->r10 - new_cfa;
86 fs->regs.reg[11].how = REG_SAVED_OFFSET;
87 fs->regs.reg[11].loc.offset = (long)&sc->r11 - new_cfa;
88 fs->regs.reg[12].how = REG_SAVED_OFFSET;
89 fs->regs.reg[12].loc.offset = (long)&sc->r12 - new_cfa;
90 fs->regs.reg[13].how = REG_SAVED_OFFSET;
91 fs->regs.reg[13].loc.offset = (long)&sc->r13 - new_cfa;
92 fs->regs.reg[14].how = REG_SAVED_OFFSET;
93 fs->regs.reg[14].loc.offset = (long)&sc->r14 - new_cfa;
94 fs->regs.reg[15].how = REG_SAVED_OFFSET;
95 fs->regs.reg[15].loc.offset = (long)&sc->r15 - new_cfa;
96 fs->regs.reg[16].how = REG_SAVED_OFFSET;
97 fs->regs.reg[16].loc.offset = (long)&sc->rip - new_cfa;
98 fs->retaddr_column = 16;
99 fs->signal_frame = 1;
100 return _URC_NO_REASON;
101 }
102
103 #else /* ifdef __x86_64__ */
104
105 /* There's no sys/ucontext.h for glibc 2.0, so no
106 signal-turned-exceptions for them. There's also no configure-run for
107 the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the
108 target libc version macro should be enough. */
109 #if !(__GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
110
111 #include <signal.h>
112 #include <sys/ucontext.h>
113
114 #define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state
115
116 static _Unwind_Reason_Code
117 x86_fallback_frame_state (struct _Unwind_Context *context,
118 _Unwind_FrameState *fs)
119 {
120 unsigned char *pc = context->ra;
121 struct sigcontext *sc;
122 long new_cfa;
123
124 /* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */
125 if (*(unsigned short *)(pc+0) == 0xb858
126 && *(unsigned int *)(pc+2) == 119
127 && *(unsigned short *)(pc+6) == 0x80cd)
128 sc = context->cfa + 4;
129 /* movl $__NR_rt_sigreturn,%eax ; int $0x80 */
130 else if (*(unsigned char *)(pc+0) == 0xb8
131 && *(unsigned int *)(pc+1) == 173
132 && *(unsigned short *)(pc+5) == 0x80cd)
133 {
134 struct rt_sigframe {
135 int sig;
136 struct siginfo *pinfo;
137 void *puc;
138 struct siginfo info;
139 struct ucontext uc;
140 } *rt_ = context->cfa;
141 /* The void * cast is necessary to avoid an aliasing warning.
142 The aliasing warning is correct, but should not be a problem
143 because it does not alias anything. */
144 sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext;
145 }
146 else
147 return _URC_END_OF_STACK;
148
149 new_cfa = sc->REG_NAME(esp);
150 fs->regs.cfa_how = CFA_REG_OFFSET;
151 fs->regs.cfa_reg = 4;
152 fs->regs.cfa_offset = new_cfa - (long) context->cfa;
153
154 /* The SVR4 register numbering macros aren't usable in libgcc. */
155 fs->regs.reg[0].how = REG_SAVED_OFFSET;
156 fs->regs.reg[0].loc.offset = (long)&sc->REG_NAME(eax) - new_cfa;
157 fs->regs.reg[3].how = REG_SAVED_OFFSET;
158 fs->regs.reg[3].loc.offset = (long)&sc->REG_NAME(ebx) - new_cfa;
159 fs->regs.reg[1].how = REG_SAVED_OFFSET;
160 fs->regs.reg[1].loc.offset = (long)&sc->REG_NAME(ecx) - new_cfa;
161 fs->regs.reg[2].how = REG_SAVED_OFFSET;
162 fs->regs.reg[2].loc.offset = (long)&sc->REG_NAME(edx) - new_cfa;
163 fs->regs.reg[6].how = REG_SAVED_OFFSET;
164 fs->regs.reg[6].loc.offset = (long)&sc->REG_NAME(esi) - new_cfa;
165 fs->regs.reg[7].how = REG_SAVED_OFFSET;
166 fs->regs.reg[7].loc.offset = (long)&sc->REG_NAME(edi) - new_cfa;
167 fs->regs.reg[5].how = REG_SAVED_OFFSET;
168 fs->regs.reg[5].loc.offset = (long)&sc->REG_NAME(ebp) - new_cfa;
169 fs->regs.reg[8].how = REG_SAVED_OFFSET;
170 fs->regs.reg[8].loc.offset = (long)&sc->REG_NAME(eip) - new_cfa;
171 fs->retaddr_column = 8;
172 fs->signal_frame = 1;
173 return _URC_NO_REASON;
174 }
175 #endif /* not glibc 2.0 */
176 #endif /* ifdef __x86_64__ */
177 #endif /* ifdef inhibit_libc */