gcc/config/i386/sol2-unwind.h

   1 /* DWARF2 EH unwinding support for AMD x86-64 and x86.
   2    Copyright (C) 2009, 2010 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
  28 #include <ucontext.h>
  29 #include <sys/frame.h>
  30
  31 #ifdef __x86_64__
  32
  33 #define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state
  34
  35 static _Unwind_Reason_Code
  36 x86_64_fallback_frame_state (struct _Unwind_Context *context,
  37                              _Unwind_FrameState *fs)
  38 {
  39   unsigned char *pc = context->ra;
  40   mcontext_t *mctx;
  41   long new_cfa;
  42
  43   if (/* Solaris 10+
  44         ------------
  45         <__sighndlr+0>:      push   %rbp
  46         <__sighndlr+1>:      mov    %rsp,%rbp
  47         <__sighndlr+4>:      callq  *%rcx
  48         <__sighndlr+6>:      leaveq           <--- PC
  49         <__sighndlr+7>:      retq  */
  50       *(unsigned long *)(pc - 6) == 0xc3c9d1ffe5894855)
  51
  52     /* We need to move up three frames:
  53
  54                 <signal handler>        <-- context->cfa
  55                 __sighndlr
  56                 call_user_handler
  57                 sigacthandler
  58                 <kernel>
  59
  60        context->cfa points into the frame after the saved frame pointer and
  61        saved pc (struct frame).
  62
  63        The ucontext_t structure is in the kernel frame after the signal
  64        number and a siginfo_t *.  Since the frame sizes vary even within
  65        Solaris 10 updates, we need to walk the stack to get there.  */
  66     {
  67       struct frame *fp = (struct frame *) context->cfa - 1;
  68       struct handler_args {
  69         int signo;
  70         siginfo_t *sip;
  71         ucontext_t ucontext;
  72       } *handler_args;
  73       ucontext_t *ucp;
  74
  75       /* Next frame: __sighndlr frame pointer.  */
  76       fp = (struct frame *) fp->fr_savfp;
  77       /* call_user_handler frame pointer.  */
  78       fp = (struct frame *) fp->fr_savfp;
  79       /* sigacthandler frame pointer.  */
  80       fp = (struct frame *) fp->fr_savfp;
  81
  82       /* The argument area precedes the struct frame.  */
  83       handler_args = (struct handler_args *) (fp + 1);
  84       ucp = &handler_args->ucontext;
  85       mctx = &ucp->uc_mcontext;
  86     }
  87   else
  88     return _URC_END_OF_STACK;
  89
  90   new_cfa = mctx->gregs[REG_RSP];
  91
  92   fs->regs.cfa_how = CFA_REG_OFFSET;
  93   fs->regs.cfa_reg = 7;
  94   fs->regs.cfa_offset = new_cfa - (long) context->cfa;
  95
  96   /* The SVR4 register numbering macros aren't usable in libgcc.  */
  97   fs->regs.reg[0].how = REG_SAVED_OFFSET;
  98   fs->regs.reg[0].loc.offset = (long)&mctx->gregs[REG_RAX] - new_cfa;
  99   fs->regs.reg[1].how = REG_SAVED_OFFSET;
 100   fs->regs.reg[1].loc.offset = (long)&mctx->gregs[REG_RDX] - new_cfa;
 101   fs->regs.reg[2].how = REG_SAVED_OFFSET;
 102   fs->regs.reg[2].loc.offset = (long)&mctx->gregs[REG_RCX] - new_cfa;
 103   fs->regs.reg[3].how = REG_SAVED_OFFSET;
 104   fs->regs.reg[3].loc.offset = (long)&mctx->gregs[REG_RBX] - new_cfa;
 105   fs->regs.reg[4].how = REG_SAVED_OFFSET;
 106   fs->regs.reg[4].loc.offset = (long)&mctx->gregs[REG_RSI] - new_cfa;
 107   fs->regs.reg[5].how = REG_SAVED_OFFSET;
 108   fs->regs.reg[5].loc.offset = (long)&mctx->gregs[REG_RDI] - new_cfa;
 109   fs->regs.reg[6].how = REG_SAVED_OFFSET;
 110   fs->regs.reg[6].loc.offset = (long)&mctx->gregs[REG_RBP] - new_cfa;
 111   fs->regs.reg[8].how = REG_SAVED_OFFSET;
 112   fs->regs.reg[8].loc.offset = (long)&mctx->gregs[REG_R8] - new_cfa;
 113   fs->regs.reg[9].how = REG_SAVED_OFFSET;
 114   fs->regs.reg[9].loc.offset = (long)&mctx->gregs[REG_R9] - new_cfa;
 115   fs->regs.reg[10].how = REG_SAVED_OFFSET;
 116   fs->regs.reg[10].loc.offset = (long)&mctx->gregs[REG_R10] - new_cfa;
 117   fs->regs.reg[11].how = REG_SAVED_OFFSET;
 118   fs->regs.reg[11].loc.offset = (long)&mctx->gregs[REG_R11] - new_cfa;
 119   fs->regs.reg[12].how = REG_SAVED_OFFSET;
 120   fs->regs.reg[12].loc.offset = (long)&mctx->gregs[REG_R12] - new_cfa;
 121   fs->regs.reg[13].how = REG_SAVED_OFFSET;
 122   fs->regs.reg[13].loc.offset = (long)&mctx->gregs[REG_R13] - new_cfa;
 123   fs->regs.reg[14].how = REG_SAVED_OFFSET;
 124   fs->regs.reg[14].loc.offset = (long)&mctx->gregs[REG_R14] - new_cfa;
 125   fs->regs.reg[15].how = REG_SAVED_OFFSET;
 126   fs->regs.reg[15].loc.offset = (long)&mctx->gregs[REG_R15] - new_cfa;
 127   fs->regs.reg[16].how = REG_SAVED_OFFSET;
 128   fs->regs.reg[16].loc.offset = (long)&mctx->gregs[REG_RIP] - new_cfa;
 129   fs->retaddr_column = 16;
 130   fs->signal_frame = 1;
 131
 132   return _URC_NO_REASON;
 133 }
 134
 135 #else
 136
 137 #define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state
 138
 139 static _Unwind_Reason_Code
 140 x86_fallback_frame_state (struct _Unwind_Context *context,
 141                           _Unwind_FrameState *fs)
 142 {
 143   unsigned char *pc = context->ra;
 144   mcontext_t *mctx;
 145   long new_cfa;
 146
 147   if (/* Solaris 8 - single-threaded
 148         ----------------------------
 149         <sigacthandler+17>:  mov    0x10(%ebp),%esi
 150         <sigacthandler+20>:  push   %esi
 151         <sigacthandler+21>:  pushl  0xc(%ebp)
 152         <sigacthandler+24>:  mov    0x8(%ebp),%ecx
 153         <sigacthandler+27>:  push   %ecx
 154         <sigacthandler+28>:  mov    offset(%ebx),%eax
 155         <sigacthandler+34>:  call   *(%eax,%ecx,4)
 156         <sigacthandler+37>:  add    $0xc,%esp        <--- PC
 157         <sigacthandler+40>:  push   %esi ... */
 158       (*(unsigned long *)(pc - 20) == 0x5610758b
 159        && *(unsigned long *)(pc - 16) == 0x8b0c75ff
 160        && *(unsigned long *)(pc - 12) == 0x8b51084d
 161        && *(unsigned char *)(pc - 8)  == 0x83
 162        && *(unsigned long *)(pc - 4)  == 0x8814ff00
 163        && *(unsigned long *)(pc - 0)  == 0x560cc483)
 164
 165       || /* Solaris 8 - multi-threaded
 166            ---------------------------
 167            <__sighndlr+0>:      push   %ebp
 168            <__sighndlr+1>:      mov    %esp,%ebp
 169            <__sighndlr+3>:      pushl  0x10(%ebp)
 170            <__sighndlr+6>:      pushl  0xc(%ebp)
 171            <__sighndlr+9>:      pushl  0x8(%ebp)
 172            <__sighndlr+12>:     call   *0x14(%ebp)
 173            <__sighndlr+15>:     leave               <--- PC  */
 174          (*(unsigned long *)(pc - 15) == 0xffec8b55
 175           && *(unsigned long *)(pc - 11) == 0x75ff1075
 176           && *(unsigned long *)(pc - 7)  == 0x0875ff0c
 177           && *(unsigned long *)(pc - 3)  == 0xc91455ff)
 178
 179       || /* Solaris 9 - single-threaded
 180            ----------------------------
 181            <sigacthandler+16>:    mov    0x244(%ebx),%ecx
 182            <sigacthandler+22>:    mov    0x8(%ebp),%eax
 183            <sigacthandler+25>:    mov    (%ecx,%eax,4),%ecx
 184            <sigacthandler+28>:    pushl  0x10(%ebp)
 185            <sigacthandler+31>:    pushl  0xc(%ebp)
 186            <sigacthandler+34>:    push   %eax
 187            <sigacthandler+35>:    call   *%ecx
 188            <sigacthandler+37>:    add    $0xc,%esp      <--- PC
 189            <sigacthandler+40>:    pushl  0x10(%ebp) */
 190          (*(unsigned long *)(pc - 21) == 0x2448b8b
 191           && *(unsigned long *)(pc - 17) == 0x458b0000
 192           && *(unsigned long *)(pc - 13) == 0x810c8b08
 193           && *(unsigned long *)(pc - 9)  == 0xff1075ff
 194           && *(unsigned long *)(pc - 5)  == 0xff500c75
 195           && *(unsigned long *)(pc - 1)  == 0xcc483d1)
 196
 197       || /* Solaris 9 - multi-threaded, Solaris 10
 198            ---------------------------------------
 199            <__sighndlr+0>:      push   %ebp
 200            <__sighndlr+1>:      mov    %esp,%ebp
 201            <__sighndlr+3>:      pushl  0x10(%ebp)
 202            <__sighndlr+6>:      pushl  0xc(%ebp)
 203            <__sighndlr+9>:      pushl  0x8(%ebp)
 204            <__sighndlr+12>:     call   *0x14(%ebp)
 205            <__sighndlr+15>:     add    $0xc,%esp     <--- PC
 206            <__sighndlr+18>:     leave
 207            <__sighndlr+19>:     ret  */
 208          (*(unsigned long *)(pc - 15) == 0xffec8b55
 209           && *(unsigned long *)(pc - 11) == 0x75ff1075
 210           && *(unsigned long *)(pc - 7)  == 0x0875ff0c
 211           && *(unsigned long *)(pc - 3)  == 0x831455ff
 212           && *(unsigned long *)(pc + 1)  == 0xc3c90cc4)
 213
 214       || /* Solaris 11 before snv_125
 215            --------------------------
 216           <__sighndlr+0>        push   %ebp
 217           <__sighndlr+1>        mov    %esp,%ebp
 218           <__sighndlr+4>        pushl  0x10(%ebp)
 219           <__sighndlr+6>        pushl  0xc(%ebp)
 220           <__sighndlr+9>        pushl  0x8(%ebp)
 221           <__sighndlr+12>       call   *0x14(%ebp)
 222           <__sighndlr+15>       add    $0xc,%esp
 223           <__sighndlr+18>       leave                <--- PC
 224           <__sighndlr+19>       ret  */
 225          (*(unsigned long *)(pc - 18) == 0xffec8b55
 226           && *(unsigned long *)(pc - 14) == 0x7fff107f
 227           && *(unsigned long *)(pc - 10)  == 0x0875ff0c
 228           && *(unsigned long *)(pc - 6)  == 0x83145fff
 229           && *(unsigned long *)(pc - 1)  == 0xc3c90cc4)
 230
 231       || /* Solaris 11 since snv_125
 232            -------------------------
 233           <__sighndlr+0>        push   %ebp
 234           <__sighndlr+1>        mov    %esp,%ebp
 235           <__sighndlr+3>        and    $0xfffffff0,%esp
 236           <__sighndlr+6>        sub    $0x4,%esp
 237           <__sighndlr+9>        pushl  0x10(%ebp)
 238           <__sighndlr+12>       pushl  0xc(%ebp)
 239           <__sighndlr+15>       pushl  0x8(%ebp)
 240           <__sighndlr+18>       call   *0x14(%ebp)
 241           <__sighndlr+21>       leave                <--- PC
 242           <__sighndlr+22>       ret  */
 243          (*(unsigned long *)(pc - 21) == 0x83ec8b55
 244           && *(unsigned long *)(pc - 17) == 0xec83f0e4
 245           && *(unsigned long *)(pc - 13)  == 0x1075ff04
 246           && *(unsigned long *)(pc - 9)  == 0xff0c75ff
 247           && *(unsigned long *)(pc - 5)  == 0x55ff0875
 248           && (*(unsigned long *)(pc - 1) & 0x00ffffff) == 0x00c3c914))
 249     {
 250       struct handler_args {
 251         int signo;
 252         siginfo_t *sip;
 253         ucontext_t *ucontext;
 254       } *handler_args = context->cfa;
 255       mctx = &handler_args->ucontext->uc_mcontext;
 256     }
 257   else
 258     return _URC_END_OF_STACK;
 259
 260   new_cfa = mctx->gregs[UESP];
 261
 262   fs->regs.cfa_how = CFA_REG_OFFSET;
 263   fs->regs.cfa_reg = 4;
 264   fs->regs.cfa_offset = new_cfa - (long) context->cfa;
 265
 266   /* The SVR4 register numbering macros aren't usable in libgcc.  */
 267   fs->regs.reg[0].how = REG_SAVED_OFFSET;
 268   fs->regs.reg[0].loc.offset = (long)&mctx->gregs[EAX] - new_cfa;
 269   fs->regs.reg[3].how = REG_SAVED_OFFSET;
 270   fs->regs.reg[3].loc.offset = (long)&mctx->gregs[EBX] - new_cfa;
 271   fs->regs.reg[1].how = REG_SAVED_OFFSET;
 272   fs->regs.reg[1].loc.offset = (long)&mctx->gregs[ECX] - new_cfa;
 273   fs->regs.reg[2].how = REG_SAVED_OFFSET;
 274   fs->regs.reg[2].loc.offset = (long)&mctx->gregs[EDX] - new_cfa;
 275   fs->regs.reg[6].how = REG_SAVED_OFFSET;
 276   fs->regs.reg[6].loc.offset = (long)&mctx->gregs[ESI] - new_cfa;
 277   fs->regs.reg[7].how = REG_SAVED_OFFSET;
 278   fs->regs.reg[7].loc.offset = (long)&mctx->gregs[EDI] - new_cfa;
 279   fs->regs.reg[5].how = REG_SAVED_OFFSET;
 280   fs->regs.reg[5].loc.offset = (long)&mctx->gregs[EBP] - new_cfa;
 281   fs->regs.reg[8].how = REG_SAVED_OFFSET;
 282   fs->regs.reg[8].loc.offset = (long)&mctx->gregs[EIP] - new_cfa;
 283   fs->retaddr_column = 8;
 284   fs->signal_frame = 1;
 285
 286   return _URC_NO_REASON;
 287 }
 288
 289 #endif