]>
Commit | Line | Data |
---|---|---|
8662eb14 | 1 | /* DWARF2 EH unwinding support for AMD x86-64 and x86. |
6c0170ea JM |
2 | Copyright (C) 2004, 2005, 2006, 2009, 2010, 2011 |
3 | Free Software Foundation, Inc. | |
8662eb14 AM |
4 | |
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
748086b7 | 9 | the Free Software Foundation; either version 3, or (at your option) |
8662eb14 AM |
10 | any later version. |
11 | ||
12 | GCC is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
748086b7 JJ |
17 | Under Section 7 of GPL version 3, you are granted additional |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
8662eb14 AM |
25 | |
26 | /* Do code reading to identify a signal frame, and set the frame | |
27 | state data appropriately. See unwind-dw2.c for the structs. | |
28 | Don't use this at all if inhibit_libc is used. */ | |
29 | ||
30 | #ifndef inhibit_libc | |
31 | ||
32 | #ifdef __x86_64__ | |
33 | ||
34 | #include <signal.h> | |
35 | #include <sys/ucontext.h> | |
36 | ||
37 | #define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state | |
38 | ||
39 | static _Unwind_Reason_Code | |
40 | x86_64_fallback_frame_state (struct _Unwind_Context *context, | |
41 | _Unwind_FrameState *fs) | |
42 | { | |
43 | unsigned char *pc = context->ra; | |
44 | struct sigcontext *sc; | |
45 | long new_cfa; | |
46 | ||
40f2f11f L |
47 | /* movq $__NR_rt_sigreturn, %rax ; syscall. */ |
48 | #ifdef __LP64__ | |
49 | #define RT_SIGRETURN_SYSCALL 0x050f0000000fc0c7ULL | |
50 | #else | |
51 | #define RT_SIGRETURN_SYSCALL 0x050f40002006c0c7ULL | |
52 | #endif | |
8662eb14 | 53 | if (*(unsigned char *)(pc+0) == 0x48 |
40f2f11f | 54 | && *(unsigned long long *)(pc+1) == RT_SIGRETURN_SYSCALL) |
8662eb14 AM |
55 | { |
56 | struct ucontext *uc_ = context->cfa; | |
606c33f1 RH |
57 | /* The void * cast is necessary to avoid an aliasing warning. |
58 | The aliasing warning is correct, but should not be a problem | |
59 | because it does not alias anything. */ | |
60 | sc = (struct sigcontext *) (void *) &uc_->uc_mcontext; | |
8662eb14 AM |
61 | } |
62 | else | |
63 | return _URC_END_OF_STACK; | |
64 | ||
65 | new_cfa = sc->rsp; | |
6673f90b | 66 | fs->regs.cfa_how = CFA_REG_OFFSET; |
8662eb14 | 67 | /* Register 7 is rsp */ |
6673f90b NF |
68 | fs->regs.cfa_reg = 7; |
69 | fs->regs.cfa_offset = new_cfa - (long) context->cfa; | |
8662eb14 AM |
70 | |
71 | /* The SVR4 register numbering macros aren't usable in libgcc. */ | |
72 | fs->regs.reg[0].how = REG_SAVED_OFFSET; | |
73 | fs->regs.reg[0].loc.offset = (long)&sc->rax - new_cfa; | |
74 | fs->regs.reg[1].how = REG_SAVED_OFFSET; | |
75 | fs->regs.reg[1].loc.offset = (long)&sc->rdx - new_cfa; | |
76 | fs->regs.reg[2].how = REG_SAVED_OFFSET; | |
77 | fs->regs.reg[2].loc.offset = (long)&sc->rcx - new_cfa; | |
78 | fs->regs.reg[3].how = REG_SAVED_OFFSET; | |
79 | fs->regs.reg[3].loc.offset = (long)&sc->rbx - new_cfa; | |
80 | fs->regs.reg[4].how = REG_SAVED_OFFSET; | |
81 | fs->regs.reg[4].loc.offset = (long)&sc->rsi - new_cfa; | |
82 | fs->regs.reg[5].how = REG_SAVED_OFFSET; | |
83 | fs->regs.reg[5].loc.offset = (long)&sc->rdi - new_cfa; | |
84 | fs->regs.reg[6].how = REG_SAVED_OFFSET; | |
85 | fs->regs.reg[6].loc.offset = (long)&sc->rbp - new_cfa; | |
86 | fs->regs.reg[8].how = REG_SAVED_OFFSET; | |
87 | fs->regs.reg[8].loc.offset = (long)&sc->r8 - new_cfa; | |
88 | fs->regs.reg[9].how = REG_SAVED_OFFSET; | |
89 | fs->regs.reg[9].loc.offset = (long)&sc->r9 - new_cfa; | |
90 | fs->regs.reg[10].how = REG_SAVED_OFFSET; | |
91 | fs->regs.reg[10].loc.offset = (long)&sc->r10 - new_cfa; | |
92 | fs->regs.reg[11].how = REG_SAVED_OFFSET; | |
93 | fs->regs.reg[11].loc.offset = (long)&sc->r11 - new_cfa; | |
94 | fs->regs.reg[12].how = REG_SAVED_OFFSET; | |
95 | fs->regs.reg[12].loc.offset = (long)&sc->r12 - new_cfa; | |
96 | fs->regs.reg[13].how = REG_SAVED_OFFSET; | |
97 | fs->regs.reg[13].loc.offset = (long)&sc->r13 - new_cfa; | |
98 | fs->regs.reg[14].how = REG_SAVED_OFFSET; | |
99 | fs->regs.reg[14].loc.offset = (long)&sc->r14 - new_cfa; | |
100 | fs->regs.reg[15].how = REG_SAVED_OFFSET; | |
101 | fs->regs.reg[15].loc.offset = (long)&sc->r15 - new_cfa; | |
102 | fs->regs.reg[16].how = REG_SAVED_OFFSET; | |
103 | fs->regs.reg[16].loc.offset = (long)&sc->rip - new_cfa; | |
104 | fs->retaddr_column = 16; | |
754e45a8 | 105 | fs->signal_frame = 1; |
8662eb14 AM |
106 | return _URC_NO_REASON; |
107 | } | |
108 | ||
109 | #else /* ifdef __x86_64__ */ | |
110 | ||
111 | /* There's no sys/ucontext.h for glibc 2.0, so no | |
112 | signal-turned-exceptions for them. There's also no configure-run for | |
113 | the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the | |
114 | target libc version macro should be enough. */ | |
4e18507b | 115 | #if defined __GLIBC__ && !(__GLIBC__ == 2 && __GLIBC_MINOR__ == 0) |
8662eb14 AM |
116 | |
117 | #include <signal.h> | |
118 | #include <sys/ucontext.h> | |
119 | ||
120 | #define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state | |
121 | ||
122 | static _Unwind_Reason_Code | |
123 | x86_fallback_frame_state (struct _Unwind_Context *context, | |
124 | _Unwind_FrameState *fs) | |
125 | { | |
126 | unsigned char *pc = context->ra; | |
127 | struct sigcontext *sc; | |
128 | long new_cfa; | |
129 | ||
130 | /* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */ | |
131 | if (*(unsigned short *)(pc+0) == 0xb858 | |
132 | && *(unsigned int *)(pc+2) == 119 | |
133 | && *(unsigned short *)(pc+6) == 0x80cd) | |
134 | sc = context->cfa + 4; | |
135 | /* movl $__NR_rt_sigreturn,%eax ; int $0x80 */ | |
136 | else if (*(unsigned char *)(pc+0) == 0xb8 | |
137 | && *(unsigned int *)(pc+1) == 173 | |
138 | && *(unsigned short *)(pc+5) == 0x80cd) | |
139 | { | |
140 | struct rt_sigframe { | |
141 | int sig; | |
142 | struct siginfo *pinfo; | |
143 | void *puc; | |
144 | struct siginfo info; | |
145 | struct ucontext uc; | |
146 | } *rt_ = context->cfa; | |
606c33f1 RH |
147 | /* The void * cast is necessary to avoid an aliasing warning. |
148 | The aliasing warning is correct, but should not be a problem | |
149 | because it does not alias anything. */ | |
150 | sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext; | |
8662eb14 AM |
151 | } |
152 | else | |
153 | return _URC_END_OF_STACK; | |
154 | ||
6c0170ea | 155 | new_cfa = sc->esp; |
6673f90b NF |
156 | fs->regs.cfa_how = CFA_REG_OFFSET; |
157 | fs->regs.cfa_reg = 4; | |
158 | fs->regs.cfa_offset = new_cfa - (long) context->cfa; | |
8662eb14 AM |
159 | |
160 | /* The SVR4 register numbering macros aren't usable in libgcc. */ | |
161 | fs->regs.reg[0].how = REG_SAVED_OFFSET; | |
6c0170ea | 162 | fs->regs.reg[0].loc.offset = (long)&sc->eax - new_cfa; |
8662eb14 | 163 | fs->regs.reg[3].how = REG_SAVED_OFFSET; |
6c0170ea | 164 | fs->regs.reg[3].loc.offset = (long)&sc->ebx - new_cfa; |
8662eb14 | 165 | fs->regs.reg[1].how = REG_SAVED_OFFSET; |
6c0170ea | 166 | fs->regs.reg[1].loc.offset = (long)&sc->ecx - new_cfa; |
8662eb14 | 167 | fs->regs.reg[2].how = REG_SAVED_OFFSET; |
6c0170ea | 168 | fs->regs.reg[2].loc.offset = (long)&sc->edx - new_cfa; |
8662eb14 | 169 | fs->regs.reg[6].how = REG_SAVED_OFFSET; |
6c0170ea | 170 | fs->regs.reg[6].loc.offset = (long)&sc->esi - new_cfa; |
8662eb14 | 171 | fs->regs.reg[7].how = REG_SAVED_OFFSET; |
6c0170ea | 172 | fs->regs.reg[7].loc.offset = (long)&sc->edi - new_cfa; |
8662eb14 | 173 | fs->regs.reg[5].how = REG_SAVED_OFFSET; |
6c0170ea | 174 | fs->regs.reg[5].loc.offset = (long)&sc->ebp - new_cfa; |
8662eb14 | 175 | fs->regs.reg[8].how = REG_SAVED_OFFSET; |
6c0170ea | 176 | fs->regs.reg[8].loc.offset = (long)&sc->eip - new_cfa; |
8662eb14 | 177 | fs->retaddr_column = 8; |
754e45a8 | 178 | fs->signal_frame = 1; |
8662eb14 AM |
179 | return _URC_NO_REASON; |
180 | } | |
eca9d807 EB |
181 | |
182 | #define MD_FROB_UPDATE_CONTEXT x86_frob_update_context | |
183 | ||
184 | /* Fix up for kernels that have vDSO, but don't have S flag in it. */ | |
185 | ||
186 | static void | |
187 | x86_frob_update_context (struct _Unwind_Context *context, | |
188 | _Unwind_FrameState *fs ATTRIBUTE_UNUSED) | |
189 | { | |
190 | unsigned char *pc = context->ra; | |
191 | ||
192 | /* movl $__NR_rt_sigreturn,%eax ; {int $0x80 | syscall} */ | |
193 | if (*(unsigned char *)(pc+0) == 0xb8 | |
194 | && *(unsigned int *)(pc+1) == 173 | |
195 | && (*(unsigned short *)(pc+5) == 0x80cd | |
196 | || *(unsigned short *)(pc+5) == 0x050f)) | |
197 | _Unwind_SetSignalFrame (context, 1); | |
198 | } | |
199 | ||
8662eb14 AM |
200 | #endif /* not glibc 2.0 */ |
201 | #endif /* ifdef __x86_64__ */ | |
202 | #endif /* ifdef inhibit_libc */ |