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