gcc/config/alpha/vms-unwind.h

   1 /* DWARF2 EH unwinding support for Alpha VMS.
   2    Copyright (C) 2004, 2007 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 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #include <pdscdef.h>
  21
  22 #define MD_FALLBACK_FRAME_STATE_FOR alpha_fallback_frame_state
  23
  24 static _Unwind_Reason_Code
  25 alpha_fallback_frame_state (struct _Unwind_Context *context,
  26                             _Unwind_FrameState *fs)
  27 {
  28   PDSCDEF *pv = *((PDSCDEF **) context->reg [29]);
  29
  30   if (pv && ((long) pv & 0x7) == 0) /* low bits 0 means address */
  31     pv = *(PDSCDEF **) pv;
  32
  33   if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_STACK))
  34     {
  35       int i, j;
  36
  37       fs->regs.cfa_offset = pv->pdsc$l_size;
  38       fs->regs.cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
  39       fs->retaddr_column = 26;
  40       fs->regs.cfa_how = CFA_REG_OFFSET;
  41       fs->regs.reg[27].loc.offset = -pv->pdsc$l_size;
  42       fs->regs.reg[27].how = REG_SAVED_OFFSET;
  43       fs->regs.reg[26].loc.offset
  44         = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset);
  45       fs->regs.reg[26].how = REG_SAVED_OFFSET;
  46
  47       for (i = 0, j = 0; i < 32; i++)
  48         if (1<<i & pv->pdsc$l_ireg_mask)
  49           {
  50             fs->regs.reg[i].loc.offset
  51               = -(pv->pdsc$l_size - pv->pdsc$w_rsa_offset - 8 * ++j);
  52             fs->regs.reg[i].how = REG_SAVED_OFFSET;
  53           }
  54
  55       return _URC_NO_REASON;
  56     }
  57   else if (pv && ((pv->pdsc$w_flags & 0xf) == PDSC$K_KIND_FP_REGISTER))
  58     {
  59       fs->regs.cfa_offset = pv->pdsc$l_size;
  60       fs->regs.cfa_reg = pv->pdsc$w_flags & PDSC$M_BASE_REG_IS_FP ? 29 : 30;
  61       fs->retaddr_column = 26;
  62       fs->regs.cfa_how = CFA_REG_OFFSET;
  63       fs->regs.reg[26].loc.reg = pv->pdsc$b_save_ra;
  64       fs->regs.reg[26].how = REG_SAVED_REG;
  65       fs->regs.reg[29].loc.reg = pv->pdsc$b_save_fp;
  66       fs->regs.reg[29].how = REG_SAVED_REG;
  67
  68       return _URC_NO_REASON;
  69     }
  70   return _URC_END_OF_STACK;
  71 }