1 /* DWARF2 EH unwinding support for AMD x86-64 and x86.
2 Copyright (C) 2004, 2005 Free Software Foundation, Inc.
4 This file is part of GCC.
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 2, or (at your option)
11 In addition to the permissions in the GNU General Public License, the
12 Free Software Foundation gives you unlimited permission to link the
13 compiled version of this file with other programs, and to distribute
14 those programs without any restriction coming from the use of this
15 file. (The General Public License restrictions do apply in other
16 respects; for example, they cover modification of the file, and
17 distribution when not linked into another program.)
19 GCC is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 GNU General Public License for more details.
24 You should have received a copy of the GNU General Public License
25 along with GCC; see the file COPYING. If not, write to
26 the Free Software Foundation, 59 Temple Place - Suite 330,
27 Boston, MA 02111-1307, USA. */
29 /* Do code reading to identify a signal frame, and set the frame
30 state data appropriately. See unwind-dw2.c for the structs.
31 Don't use this at all if inhibit_libc is used. */
38 #include <sys/ucontext.h>
40 #define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state
42 static _Unwind_Reason_Code
43 x86_64_fallback_frame_state (struct _Unwind_Context *context,
44 _Unwind_FrameState *fs)
46 unsigned char *pc = context->ra;
47 struct sigcontext *sc;
50 /* movq __NR_rt_sigreturn, %rax ; syscall */
51 if (*(unsigned char *)(pc+0) == 0x48
52 && *(unsigned long *)(pc+1) == 0x050f0000000fc0c7)
54 struct ucontext *uc_ = context->cfa;
55 sc = (struct sigcontext *) &uc_->uc_mcontext;
58 return _URC_END_OF_STACK;
61 fs->cfa_how = CFA_REG_OFFSET;
62 /* Register 7 is rsp */
64 fs->cfa_offset = new_cfa - (long) context->cfa;
66 /* The SVR4 register numbering macros aren't usable in libgcc. */
67 fs->regs.reg[0].how = REG_SAVED_OFFSET;
68 fs->regs.reg[0].loc.offset = (long)&sc->rax - new_cfa;
69 fs->regs.reg[1].how = REG_SAVED_OFFSET;
70 fs->regs.reg[1].loc.offset = (long)&sc->rdx - new_cfa;
71 fs->regs.reg[2].how = REG_SAVED_OFFSET;
72 fs->regs.reg[2].loc.offset = (long)&sc->rcx - new_cfa;
73 fs->regs.reg[3].how = REG_SAVED_OFFSET;
74 fs->regs.reg[3].loc.offset = (long)&sc->rbx - new_cfa;
75 fs->regs.reg[4].how = REG_SAVED_OFFSET;
76 fs->regs.reg[4].loc.offset = (long)&sc->rsi - new_cfa;
77 fs->regs.reg[5].how = REG_SAVED_OFFSET;
78 fs->regs.reg[5].loc.offset = (long)&sc->rdi - new_cfa;
79 fs->regs.reg[6].how = REG_SAVED_OFFSET;
80 fs->regs.reg[6].loc.offset = (long)&sc->rbp - new_cfa;
81 fs->regs.reg[8].how = REG_SAVED_OFFSET;
82 fs->regs.reg[8].loc.offset = (long)&sc->r8 - new_cfa;
83 fs->regs.reg[9].how = REG_SAVED_OFFSET;
84 fs->regs.reg[9].loc.offset = (long)&sc->r9 - new_cfa;
85 fs->regs.reg[10].how = REG_SAVED_OFFSET;
86 fs->regs.reg[10].loc.offset = (long)&sc->r10 - new_cfa;
87 fs->regs.reg[11].how = REG_SAVED_OFFSET;
88 fs->regs.reg[11].loc.offset = (long)&sc->r11 - new_cfa;
89 fs->regs.reg[12].how = REG_SAVED_OFFSET;
90 fs->regs.reg[12].loc.offset = (long)&sc->r12 - new_cfa;
91 fs->regs.reg[13].how = REG_SAVED_OFFSET;
92 fs->regs.reg[13].loc.offset = (long)&sc->r13 - new_cfa;
93 fs->regs.reg[14].how = REG_SAVED_OFFSET;
94 fs->regs.reg[14].loc.offset = (long)&sc->r14 - new_cfa;
95 fs->regs.reg[15].how = REG_SAVED_OFFSET;
96 fs->regs.reg[15].loc.offset = (long)&sc->r15 - new_cfa;
97 fs->regs.reg[16].how = REG_SAVED_OFFSET;
98 fs->regs.reg[16].loc.offset = (long)&sc->rip - new_cfa;
99 fs->retaddr_column = 16;
100 return _URC_NO_REASON;
103 #else /* ifdef __x86_64__ */
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)
112 #include <sys/ucontext.h>
114 #define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state
116 static _Unwind_Reason_Code
117 x86_fallback_frame_state (struct _Unwind_Context *context,
118 _Unwind_FrameState *fs)
120 unsigned char *pc = context->ra;
121 struct sigcontext *sc;
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)
136 struct siginfo *pinfo;
140 } *rt_ = context->cfa;
141 sc = (struct sigcontext *) &rt_->uc.uc_mcontext;
144 return _URC_END_OF_STACK;
146 new_cfa = sc->REG_NAME(esp);
147 fs->cfa_how = CFA_REG_OFFSET;
149 fs->cfa_offset = new_cfa - (long) context->cfa;
151 /* The SVR4 register numbering macros aren't usable in libgcc. */
152 fs->regs.reg[0].how = REG_SAVED_OFFSET;
153 fs->regs.reg[0].loc.offset = (long)&sc->REG_NAME(eax) - new_cfa;
154 fs->regs.reg[3].how = REG_SAVED_OFFSET;
155 fs->regs.reg[3].loc.offset = (long)&sc->REG_NAME(ebx) - new_cfa;
156 fs->regs.reg[1].how = REG_SAVED_OFFSET;
157 fs->regs.reg[1].loc.offset = (long)&sc->REG_NAME(ecx) - new_cfa;
158 fs->regs.reg[2].how = REG_SAVED_OFFSET;
159 fs->regs.reg[2].loc.offset = (long)&sc->REG_NAME(edx) - new_cfa;
160 fs->regs.reg[6].how = REG_SAVED_OFFSET;
161 fs->regs.reg[6].loc.offset = (long)&sc->REG_NAME(esi) - new_cfa;
162 fs->regs.reg[7].how = REG_SAVED_OFFSET;
163 fs->regs.reg[7].loc.offset = (long)&sc->REG_NAME(edi) - new_cfa;
164 fs->regs.reg[5].how = REG_SAVED_OFFSET;
165 fs->regs.reg[5].loc.offset = (long)&sc->REG_NAME(ebp) - new_cfa;
166 fs->regs.reg[8].how = REG_SAVED_OFFSET;
167 fs->regs.reg[8].loc.offset = (long)&sc->REG_NAME(eip) - new_cfa;
168 fs->retaddr_column = 8;
169 return _URC_NO_REASON;
171 #endif /* not glibc 2.0 */
172 #endif /* ifdef __x86_64__ */
173 #endif /* ifdef inhibit_libc */