old-autovect-branch/libjava/sysdep/i386/backtrace.h

   1 // backtrace.h - Fallback backtrace implementation. i386 implementation.
   2
   3 /* Copyright (C) 2005  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #ifndef __SYSDEP_BACKTRACE_H__
  12 #define __SYSDEP_BACKTRACE_H__
  13
  14 #include <java-stack.h>
  15
  16 #define HAVE_FALLBACK_BACKTRACE
  17
  18 /* Store return addresses of the current program stack in
  19    STATE and return the exact number of values stored.  */
  20 void
  21 fallback_backtrace (_Jv_UnwindState *state)
  22 {
  23   register void *_ebp __asm__ ("ebp");
  24   register void *_esp __asm__ ("esp");
  25   unsigned int *rfp;
  26
  27   int i = state->pos;
  28   for (rfp = *(unsigned int**)_ebp;
  29        rfp && i < state->length;
  30        rfp = *(unsigned int **)rfp)
  31     {
  32       int diff = *rfp - (unsigned int)rfp;
  33       if ((void*)rfp < _esp || diff > 4 * 1024 || diff < 0)
  34         break;
  35
  36       state->frames[i].type = frame_native;
  37       state->frames[i].ip = (void*)(rfp[1]-4);
  38       i++;
  39     }
  40   state->pos = i;
  41 }
  42 #endif