gcc/config/sparc/linux-unwind.h

   1 /* DWARF2 EH unwinding support for SPARC Linux.
   2    Copyright 2004, 2005 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 2, or (at your option)
   9 any later version.
  10
  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.)
  18
  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.
  23
  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.  */
  28
  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
  32 /* Handle multilib correctly.  */
  33 #if defined(__arch64__)
  34
  35 /* 64-bit SPARC version */
  36 #define MD_FALLBACK_FRAME_STATE_FOR sparc64_fallback_frame_state
  37
  38 static _Unwind_Reason_Code
  39 sparc64_fallback_frame_state (struct _Unwind_Context *context,
  40                               _Unwind_FrameState *fs)
  41 {
  42   unsigned int *pc = context->ra;
  43   long new_cfa, i;
  44   long regs_off, fpu_save_off;
  45   long this_cfa, fpu_save;
  46
  47   if (pc[0] != 0x82102065               /* mov NR_rt_sigreturn, %g1 */
  48       || pc[1] != 0x91d0206d)           /* ta 0x6d */
  49     return _URC_END_OF_STACK;
  50   regs_off = 192 + 128;
  51   fpu_save_off = regs_off + (16 * 8) + (3 * 8) + (2 * 4);
  52   this_cfa = (long) context->cfa;
  53   new_cfa = *(long *)((context->cfa) + (regs_off + (14 * 8)));
  54   new_cfa += 2047; /* Stack bias */
  55   fpu_save = *(long *)((this_cfa) + (fpu_save_off));
  56   fs->cfa_how = CFA_REG_OFFSET;
  57   fs->cfa_reg = 14;
  58   fs->cfa_offset = new_cfa - (long) context->cfa;
  59   for (i = 1; i < 16; ++i)
  60     {
  61       fs->regs.reg[i].how = REG_SAVED_OFFSET;
  62       fs->regs.reg[i].loc.offset =
  63         this_cfa + (regs_off + (i * 8)) - new_cfa;
  64     }
  65   for (i = 0; i < 16; ++i)
  66     {
  67       fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
  68       fs->regs.reg[i + 16].loc.offset =
  69         this_cfa + (i * 8) - new_cfa;
  70     }
  71   if (fpu_save)
  72     {
  73       for (i = 0; i < 64; ++i)
  74         {
  75           if (i > 32 && (i & 0x1))
  76             continue;
  77           fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
  78           fs->regs.reg[i + 32].loc.offset =
  79             (fpu_save + (i * 4)) - new_cfa;
  80         }
  81     }
  82   /* Stick return address into %g0, same trick Alpha uses.  */
  83   fs->regs.reg[0].how = REG_SAVED_OFFSET;
  84   fs->regs.reg[0].loc.offset =
  85     this_cfa + (regs_off + (16 * 8) + 8) - new_cfa;
  86   fs->retaddr_column = 0;
  87   return _URC_NO_REASON;
  88 }
  89
  90 #else
  91
  92 /* 32-bit SPARC version */
  93 #define MD_FALLBACK_FRAME_STATE_FOR sparc_fallback_frame_state
  94
  95 static _Unwind_Reason_Code
  96 sparc_fallback_frame_state (struct _Unwind_Context *context,
  97                             _Unwind_FrameState *fs)
  98 {
  99   unsigned int *pc = context->ra;
 100   int new_cfa, i, oldstyle;
 101   int regs_off, fpu_save_off;
 102   int fpu_save, this_cfa;
 103
 104   if (pc[1] != 0x91d02010)              /* ta 0x10 */
 105     return _URC_END_OF_STACK;
 106   if (pc[0] == 0x821020d8)              /* mov NR_sigreturn, %g1 */
 107     oldstyle = 1;
 108   else if (pc[0] == 0x82102065) /* mov NR_rt_sigreturn, %g1 */
 109     oldstyle = 0;
 110   else
 111     return _URC_END_OF_STACK;
 112   if (oldstyle)
 113     {
 114       regs_off = 96;
 115       fpu_save_off = regs_off + (4 * 4) + (16 * 4);
 116     }
 117   else
 118     {
 119       regs_off = 96 + 128;
 120       fpu_save_off = regs_off + (4 * 4) + (16 * 4) + (2 * 4);
 121     }
 122   this_cfa = (int) context->cfa;
 123   new_cfa = *(int *)((context->cfa) + (regs_off+(4*4)+(14 * 4)));
 124   fpu_save = *(int *)((this_cfa) + (fpu_save_off));
 125   fs->cfa_how = CFA_REG_OFFSET;
 126   fs->cfa_reg = 14;
 127   fs->cfa_offset = new_cfa - (int) context->cfa;
 128   for (i = 1; i < 16; ++i)
 129     {
 130       if (i == 14)
 131         continue;
 132       fs->regs.reg[i].how = REG_SAVED_OFFSET;
 133       fs->regs.reg[i].loc.offset =
 134         this_cfa + (regs_off+(4 * 4)+(i * 4)) - new_cfa;
 135     }
 136   for (i = 0; i < 16; ++i)
 137     {
 138       fs->regs.reg[i + 16].how = REG_SAVED_OFFSET;
 139       fs->regs.reg[i + 16].loc.offset =
 140         this_cfa + (i * 4) - new_cfa;
 141     }
 142   if (fpu_save)
 143     {
 144       for (i = 0; i < 32; ++i)
 145         {
 146           fs->regs.reg[i + 32].how = REG_SAVED_OFFSET;
 147           fs->regs.reg[i + 32].loc.offset =
 148             (fpu_save + (i * 4)) - new_cfa;
 149         }
 150     }
 151   /* Stick return address into %g0, same trick Alpha uses.  */
 152   fs->regs.reg[0].how = REG_SAVED_OFFSET;
 153   fs->regs.reg[0].loc.offset = this_cfa+(regs_off+4)-new_cfa;
 154   fs->retaddr_column = 0;
 155   return _URC_NO_REASON;
 156 }
 157
 158 #endif