contrib/gcc-4.7/libgcc/config/i386/dragonfly-unwind.h

   1 /* DWARF2 EH unwinding support for DragonFly BSD: AMD x86-64 and x86.
   2    Copyright (C) 2010 John Marino <draco@marino.st> */
   3
   4 /* Do code reading to identify a signal frame, and set the frame
   5    state data appropriately.  See unwind-dw2.c for the structs. */
   6
   7 #include <sys/types.h>
   8 #include <sys/sysctl.h>
   9 #include <signal.h>
  10 #include <sys/ucontext.h>
  11 #include <machine/sigframe.h>
  12
  13
  14 #define REG_NAME(reg)   sf_uc.uc_mcontext.mc_## reg
  15
  16 #ifdef __x86_64__
  17 #define MD_FALLBACK_FRAME_STATE_FOR x86_64_dragonfly_fallback_frame_state
  18
  19
  20 static void
  21 x86_64_sigtramp_range (unsigned char **start, unsigned char **end)
  22 {
  23   unsigned long ps_strings;
  24   int mib[2];
  25   size_t len;
  26
  27   mib[0] = CTL_KERN;
  28   mib[1] = KERN_PS_STRINGS;
  29   len = sizeof (ps_strings);
  30   sysctl (mib, 2, &ps_strings, &len, NULL, 0);
  31
  32   *start = (unsigned char *)ps_strings - 32;
  33   *end   = (unsigned char *)ps_strings;
  34 }
  35
  36
  37 static _Unwind_Reason_Code
  38 x86_64_dragonfly_fallback_frame_state
  39 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
  40 {
  41   unsigned char *pc = context->ra;
  42   unsigned char *sigtramp_start, *sigtramp_end;
  43   struct sigframe *sf;
  44   long new_cfa;
  45
  46   x86_64_sigtramp_range(&sigtramp_start, &sigtramp_end);
  47   if (pc >= sigtramp_end || pc < sigtramp_start)
  48     return _URC_END_OF_STACK;
  49
  50   sf = (struct sigframe *) context->cfa;
  51   new_cfa = sf->REG_NAME(rsp);
  52   fs->regs.cfa_how = CFA_REG_OFFSET;
  53   /* Register 7 is rsp  */
  54   fs->regs.cfa_reg = 7;
  55   fs->regs.cfa_offset = new_cfa - (long) context->cfa;
  56
  57   /* The SVR4 register numbering macros aren't usable in libgcc.  */
  58   fs->regs.reg[0].how = REG_SAVED_OFFSET;
  59   fs->regs.reg[0].loc.offset = (long)&sf->REG_NAME(rax) - new_cfa;
  60   fs->regs.reg[1].how = REG_SAVED_OFFSET;
  61   fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(rdx) - new_cfa;
  62   fs->regs.reg[2].how = REG_SAVED_OFFSET;
  63   fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(rcx) - new_cfa;
  64   fs->regs.reg[3].how = REG_SAVED_OFFSET;
  65   fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(rbx) - new_cfa;
  66   fs->regs.reg[4].how = REG_SAVED_OFFSET;
  67   fs->regs.reg[4].loc.offset = (long)&sf->REG_NAME(rsi) - new_cfa;
  68   fs->regs.reg[5].how = REG_SAVED_OFFSET;
  69   fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(rdi) - new_cfa;
  70   fs->regs.reg[6].how = REG_SAVED_OFFSET;
  71   fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(rbp) - new_cfa;
  72   fs->regs.reg[8].how = REG_SAVED_OFFSET;
  73   fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(r8) - new_cfa;
  74   fs->regs.reg[9].how = REG_SAVED_OFFSET;
  75   fs->regs.reg[9].loc.offset = (long)&sf->REG_NAME(r9) - new_cfa;
  76   fs->regs.reg[10].how = REG_SAVED_OFFSET;
  77   fs->regs.reg[10].loc.offset = (long)&sf->REG_NAME(r10) - new_cfa;
  78   fs->regs.reg[11].how = REG_SAVED_OFFSET;
  79   fs->regs.reg[11].loc.offset = (long)&sf->REG_NAME(r11) - new_cfa;
  80   fs->regs.reg[12].how = REG_SAVED_OFFSET;
  81   fs->regs.reg[12].loc.offset = (long)&sf->REG_NAME(r12) - new_cfa;
  82   fs->regs.reg[13].how = REG_SAVED_OFFSET;
  83   fs->regs.reg[13].loc.offset = (long)&sf->REG_NAME(r13) - new_cfa;
  84   fs->regs.reg[14].how = REG_SAVED_OFFSET;
  85   fs->regs.reg[14].loc.offset = (long)&sf->REG_NAME(r14) - new_cfa;
  86   fs->regs.reg[15].how = REG_SAVED_OFFSET;
  87   fs->regs.reg[15].loc.offset = (long)&sf->REG_NAME(r15) - new_cfa;
  88   fs->regs.reg[16].how = REG_SAVED_OFFSET;
  89   fs->regs.reg[16].loc.offset = (long)&sf->REG_NAME(rip) - new_cfa;
  90   fs->retaddr_column = 16;
  91   fs->signal_frame = 1;
  92   return _URC_NO_REASON;
  93 }
  94
  95 #else /* Next section is for i386  */
  96
  97 #define MD_FALLBACK_FRAME_STATE_FOR x86_dragonfly_fallback_frame_state
  98
  99
 100 static void
 101 x86_sigtramp_range (unsigned char **start, unsigned char **end)
 102 {
 103   unsigned long ps_strings;
 104   int mib[2];
 105   size_t len;
 106
 107   mib[0] = CTL_KERN;
 108   mib[1] = KERN_PS_STRINGS;
 109   len = sizeof (ps_strings);
 110   sysctl (mib, 2, &ps_strings, &len, NULL, 0);
 111
 112   *start = (unsigned char *)ps_strings - 128;
 113   *end   = (unsigned char *)ps_strings;
 114 }
 115
 116
 117 static _Unwind_Reason_Code
 118 x86_dragonfly_fallback_frame_state
 119 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
 120 {
 121   unsigned char *pc = context->ra;
 122   unsigned char *sigtramp_start, *sigtramp_end;
 123   struct sigframe *sf;
 124   long new_cfa;
 125
 126   x86_sigtramp_range(&sigtramp_start, &sigtramp_end);
 127
 128   if (pc >= sigtramp_end || pc < sigtramp_start)
 129     return _URC_END_OF_STACK;
 130
 131   sf = (struct sigframe *) context->cfa;
 132   new_cfa = sf->REG_NAME(esp);
 133   fs->regs.cfa_how = CFA_REG_OFFSET;
 134   fs->regs.cfa_reg = 4;
 135   fs->regs.cfa_offset = new_cfa - (long) context->cfa;
 136
 137   /* The SVR4 register numbering macros aren't usable in libgcc.  */
 138   fs->regs.reg[0].how = REG_SAVED_OFFSET;
 139   fs->regs.reg[0].loc.offset = (long)&sf->REG_NAME(eax) - new_cfa;
 140   fs->regs.reg[3].how = REG_SAVED_OFFSET;
 141   fs->regs.reg[3].loc.offset = (long)&sf->REG_NAME(ebx) - new_cfa;
 142   fs->regs.reg[1].how = REG_SAVED_OFFSET;
 143   fs->regs.reg[1].loc.offset = (long)&sf->REG_NAME(ecx) - new_cfa;
 144   fs->regs.reg[2].how = REG_SAVED_OFFSET;
 145   fs->regs.reg[2].loc.offset = (long)&sf->REG_NAME(edx) - new_cfa;
 146   fs->regs.reg[6].how = REG_SAVED_OFFSET;
 147   fs->regs.reg[6].loc.offset = (long)&sf->REG_NAME(esi) - new_cfa;
 148   fs->regs.reg[7].how = REG_SAVED_OFFSET;
 149   fs->regs.reg[7].loc.offset = (long)&sf->REG_NAME(edi) - new_cfa;
 150   fs->regs.reg[5].how = REG_SAVED_OFFSET;
 151   fs->regs.reg[5].loc.offset = (long)&sf->REG_NAME(ebp) - new_cfa;
 152   fs->regs.reg[8].how = REG_SAVED_OFFSET;
 153   fs->regs.reg[8].loc.offset = (long)&sf->REG_NAME(eip) - new_cfa;
 154   fs->retaddr_column = 8;
 155   fs->signal_frame = 1;
 156   return _URC_NO_REASON;
 157 }
 158 #endif /* ifdef __x86_64__  */