dragonfly-unwind.h revision 1.1.1.2
1 /* DWARF2 EH unwinding support for DragonFly BSD: AMD x86-64 and x86. 2 Copyright (C) 2014-2016 Free Software Foundation, Inc. 3 Contributed by John Marino <gnugcc (at) marino.st> 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 9 the Free Software Foundation; either version 3, or (at your option) 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 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/>. */ 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 29 #include <sys/types.h> 30 #include <sys/sysctl.h> 31 #include <signal.h> 32 #include <sys/ucontext.h> 33 #include <machine/sigframe.h> 34 35 36 #define REG_NAME(reg) sf_uc.uc_mcontext.mc_## reg 37 38 #ifdef __x86_64__ 39 #define MD_FALLBACK_FRAME_STATE_FOR x86_64_dragonfly_fallback_frame_state 40 41 42 static void 43 x86_64_sigtramp_range (unsigned char **start, unsigned char **end) 44 { 45 unsigned long ps_strings; 46 int mib[2]; 47 size_t len; 48 49 mib[0] = CTL_KERN; 50 mib[1] = KERN_PS_STRINGS; 51 len = sizeof (ps_strings); 52 sysctl (mib, 2, &ps_strings, &len, NULL, 0); 53 54 *start = (unsigned char *)ps_strings - 32; 55 *end = (unsigned char *)ps_strings; 56 } 57 58 59 static _Unwind_Reason_Code 60 x86_64_dragonfly_fallback_frame_state 61 (struct _Unwind_Context *context, _Unwind_FrameState *fs) 62 { 63 unsigned char *pc = context->ra; 64 unsigned char *sigtramp_start, *sigtramp_end; 65 struct sigframe *sf; 66 long new_cfa; 67 68 x86_64_sigtramp_range(&sigtramp_start, &sigtramp_end); 69 if (pc >= sigtramp_end || pc < sigtramp_start) 70 return _URC_END_OF_STACK; 71 72 sf = (struct sigframe *) context->cfa; 73 new_cfa = sf->REG_NAME(rsp); 74 fs->regs.cfa_how = CFA_REG_OFFSET; 75 /* Register 7 is rsp */ 76 fs->regs.cfa_reg = 7; 77 fs->regs.cfa_offset = new_cfa - (long) context->cfa; 78 79 /* The SVR4 register numbering macros aren't usable in libgcc. */ 80 fs->regs.reg[0].how = REG_SAVED_OFFSET; 81 fs->regs.reg[0].loc.offset = (long)&sf->REG_NAME(rax) - new_cfa; 82 fs->regs.reg[1].how = REG_SAVED_OFFSET; 83 fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(rdx) - new_cfa; 84 fs->regs.reg[2].how = REG_SAVED_OFFSET; 85 fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(rcx) - new_cfa; 86 fs->regs.reg[3].how = REG_SAVED_OFFSET; 87 fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(rbx) - new_cfa; 88 fs->regs.reg[4].how = REG_SAVED_OFFSET; 89 fs->regs.reg[4].loc.offset = (long)&sf->REG_NAME(rsi) - new_cfa; 90 fs->regs.reg[5].how = REG_SAVED_OFFSET; 91 fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(rdi) - new_cfa; 92 fs->regs.reg[6].how = REG_SAVED_OFFSET; 93 fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(rbp) - new_cfa; 94 fs->regs.reg[8].how = REG_SAVED_OFFSET; 95 fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(r8) - new_cfa; 96 fs->regs.reg[9].how = REG_SAVED_OFFSET; 97 fs->regs.reg[9].loc.offset = (long)&sf->REG_NAME(r9) - new_cfa; 98 fs->regs.reg[10].how = REG_SAVED_OFFSET; 99 fs->regs.reg[10].loc.offset = (long)&sf->REG_NAME(r10) - new_cfa; 100 fs->regs.reg[11].how = REG_SAVED_OFFSET; 101 fs->regs.reg[11].loc.offset = (long)&sf->REG_NAME(r11) - new_cfa; 102 fs->regs.reg[12].how = REG_SAVED_OFFSET; 103 fs->regs.reg[12].loc.offset = (long)&sf->REG_NAME(r12) - new_cfa; 104 fs->regs.reg[13].how = REG_SAVED_OFFSET; 105 fs->regs.reg[13].loc.offset = (long)&sf->REG_NAME(r13) - new_cfa; 106 fs->regs.reg[14].how = REG_SAVED_OFFSET; 107 fs->regs.reg[14].loc.offset = (long)&sf->REG_NAME(r14) - new_cfa; 108 fs->regs.reg[15].how = REG_SAVED_OFFSET; 109 fs->regs.reg[15].loc.offset = (long)&sf->REG_NAME(r15) - new_cfa; 110 fs->regs.reg[16].how = REG_SAVED_OFFSET; 111 fs->regs.reg[16].loc.offset = (long)&sf->REG_NAME(rip) - new_cfa; 112 fs->retaddr_column = 16; 113 fs->signal_frame = 1; 114 return _URC_NO_REASON; 115 } 116 117 #else /* Next section is for i386 */ 118 119 #define MD_FALLBACK_FRAME_STATE_FOR x86_dragonfly_fallback_frame_state 120 121 122 static void 123 x86_sigtramp_range (unsigned char **start, unsigned char **end) 124 { 125 unsigned long ps_strings; 126 int mib[2]; 127 size_t len; 128 129 mib[0] = CTL_KERN; 130 mib[1] = KERN_PS_STRINGS; 131 len = sizeof (ps_strings); 132 sysctl (mib, 2, &ps_strings, &len, NULL, 0); 133 134 *start = (unsigned char *)ps_strings - 128; 135 *end = (unsigned char *)ps_strings; 136 } 137 138 139 static _Unwind_Reason_Code 140 x86_dragonfly_fallback_frame_state 141 (struct _Unwind_Context *context, _Unwind_FrameState *fs) 142 { 143 unsigned char *pc = context->ra; 144 unsigned char *sigtramp_start, *sigtramp_end; 145 struct sigframe *sf; 146 long new_cfa; 147 148 x86_sigtramp_range(&sigtramp_start, &sigtramp_end); 149 150 if (pc >= sigtramp_end || pc < sigtramp_start) 151 return _URC_END_OF_STACK; 152 153 sf = (struct sigframe *) context->cfa; 154 new_cfa = sf->REG_NAME(esp); 155 fs->regs.cfa_how = CFA_REG_OFFSET; 156 fs->regs.cfa_reg = 4; 157 fs->regs.cfa_offset = new_cfa - (long) context->cfa; 158 159 /* The SVR4 register numbering macros aren't usable in libgcc. */ 160 fs->regs.reg[0].how = REG_SAVED_OFFSET; 161 fs->regs.reg[0].loc.offset = (long)&sf->REG_NAME(eax) - new_cfa; 162 fs->regs.reg[3].how = REG_SAVED_OFFSET; 163 fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(ebx) - new_cfa; 164 fs->regs.reg[1].how = REG_SAVED_OFFSET; 165 fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(ecx) - new_cfa; 166 fs->regs.reg[2].how = REG_SAVED_OFFSET; 167 fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(edx) - new_cfa; 168 fs->regs.reg[6].how = REG_SAVED_OFFSET; 169 fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(esi) - new_cfa; 170 fs->regs.reg[7].how = REG_SAVED_OFFSET; 171 fs->regs.reg[7].loc.offset = (long)&sf->REG_NAME(edi) - new_cfa; 172 fs->regs.reg[5].how = REG_SAVED_OFFSET; 173 fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(ebp) - new_cfa; 174 fs->regs.reg[8].how = REG_SAVED_OFFSET; 175 fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(eip) - new_cfa; 176 fs->retaddr_column = 8; 177 fs->signal_frame = 1; 178 return _URC_NO_REASON; 179 } 180 #endif /* ifdef __x86_64__ */ 181
Indexes created Sat Feb 28 05:31:39 UTC 2026