Update.

2001-10-02  Jakub Jelinek  <jakub@redhat.com>
	    H.J. Lu  <hjl@gnu.org>

	* configure.in (libc_cv_gcc_static_libgcc): Set to -static-libgcc
	if gcc supports this flag.
	(EXPORT_UNWIND_FIND_FDE): Define unless target configure disables it.
	(gcc3): Allow glibc to be compiled with gcc 3.x.
	* config.h.in (EXPORT_UNWIND_FIND_FDE): Add.
	* config.make.in (static-libgcc, unwind-find-fde): Add.
	* Makerules (build-shlib-helper, build-module-helper): Use it.
	* scripts/versions.awk: Make sure GLIBC_ versions come first.
	* elf/soinit.c (__libc_global_ctors): Set tbases and dbases if
	necessary.
	(_fini): Call __deregister_frame_info_bases if
	__register_frame_info_bases was used to register.
	* elf/Versions (__register_frame_info, __deregister_frame_info): Add
	for GLIBC_2.0.
	(__register_frame_info_bases, __register_frame_info_table_bases,
	__deregister_frame_info_bases, _Unwind_Find_FDE): Add for GLIBC_2.2.5.
	* elf/Makefile (routines): Add unwind-dw2-fde.
	(shared-only-routines): Add unwind-dw2-fde.
	* sysdeps/alpha/gccframe.h: New file.
	* sysdeps/arm/gccframe.h: New file.
	* sysdeps/generic/framestate.c: New file.
	* sysdeps/generic/dwarf2.h: New file.
	* sysdeps/generic/gccframe.h (struct object): Update from gcc 3.0.
	* sysdeps/generic/unwind-dw2-fde.c: New file.
	* sysdeps/unix/sysv/linux/ia64/unwind-dw2-fde.c: New file.
	* sysdeps/generic/unwind-dw2-fde.h: New file.
	* sysdeps/generic/unwind-dw2.c: New file.
	* sysdeps/generic/unwind-pe.h: New file.
	* sysdeps/generic/unwind.h: New file.
	* sysdeps/hppa/gccframe.h: New file.
	* sysdeps/i386/gccframe.h: New file.
	* sysdeps/m68k/gccframe.h: New file.
	* sysdeps/mips/gccframe.h: New file.
	* sysdeps/powerpc/gccframe.h: New file.
	* sysdeps/s390/gccframe.h: New file.
	* sysdeps/sh/gccframe.h: New file.
	* sysdeps/sparc/gccframe.h: New file.
	* sysdeps/vax/gccframe.h: New file.
	* sysdeps/unix/sysv/linux/configure.in (libc_cv_gcc_unwind_find_fde):
	Set on all architectures except ia64.
	* sysdeps/mach/hurd/configure.in (libc_cv_gcc_unwind_find_fde): Set
	for i386.
	* sysdeps/mach/hurd/i386/Versions (__register_frame_info,
	__deregister_frame_info): Move to elf/Versions.
	* sysdeps/unix/sysv/linux/m68k/Versions: Likewise.
	* sysdeps/unix/sysv/linux/arm/Versions: Likewise.
	* sysdeps/unix/sysv/linux/alpha/Versions: Likewise.
	* sysdeps/unix/sysv/linux/i386/Versions: Likewise.
	* sysdeps/unix/sysv/linux/mips/Versions: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/Versions: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/Versions: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/Versions: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/Versions: Likewise.
	* sysdeps/mach/hurd/i386/Makefile (sysdep-routines): Add framestate.
	* sysdeps/unix/sysv/linux/arm/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/alpha/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/i386/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/m68k/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/mips/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/sparc/Makefile: Likewise.

	* sysdeps/unix/sysv/linux/ia64/ldd-rewrite.sed: New file.
	* sysdeps/unix/sysv/linux/s390/ldd-rewrite.sed: New file.
	* sysdeps/generic/strnlen.c: New file.

1 files changed, 1207 insertions, 0 deletions

diff --git a/sysdeps/generic/unwind-dw2.c b/sysdeps/generic/unwind-dw2.c
new file mode 100644
index 0000000000..ac56e7c35c
--- /dev/null
+++ b/sysdeps/generic/unwind-dw2.c
@@ -0,0 +1,1207 @@
+/* DWARF2 exception handling and frame unwind runtime interface routines.
+   Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+
+   This file is part of GNU CC.
+
+   GNU CC is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   GNU CC is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GNU CC; see the file COPYING.  If not, write to
+   the Free Software Foundation, 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifdef _LIBC
+#include <stdlib.h>
+#include <string.h>
+#include <error.h>
+#include <libintl.h>
+#include <dwarf2.h>
+#include <unwind.h>
+#include <unwind-pe.h>
+#include <unwind-dw2-fde.h>
+#else
+#include "tconfig.h"
+#include "tsystem.h"
+#include "dwarf2.h"
+#include "unwind.h"
+#include "unwind-pe.h"
+#include "unwind-dw2-fde.h"
+#include "gthr.h"
+#endif
+
+#if !USING_SJLJ_EXCEPTIONS
+
+#ifndef STACK_GROWS_DOWNWARD
+#define STACK_GROWS_DOWNWARD 0
+#else
+#undef STACK_GROWS_DOWNWARD
+#define STACK_GROWS_DOWNWARD 1
+#endif
+
+/* A target can override (perhaps for backward compatibility) how
+   many dwarf2 columns are unwound.  */
+#ifndef DWARF_FRAME_REGISTERS
+#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
+#endif
+
+/* This is the register and unwind state for a particular frame.  */
+struct _Unwind_Context
+{
+  void *reg[DWARF_FRAME_REGISTERS+1];
+  void *cfa;
+  void *ra;
+  void *lsda;
+  struct dwarf_eh_bases bases;
+  _Unwind_Word args_size;
+};
+
+#ifndef _LIBC
+/* Byte size of every register managed by these routines.  */
+static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS];
+#endif
+
+
+/* The result of interpreting the frame unwind info for a frame.
+   This is all symbolic at this point, as none of the values can
+   be resolved until the target pc is located.  */
+typedef struct
+{
+  /* Each register save state can be described in terms of a CFA slot,
+     another register, or a location expression.  */
+  struct frame_state_reg_info
+  {
+    struct {
+      union {
+	unsigned int reg;
+	_Unwind_Sword offset;
+	const unsigned char *exp;
+      } loc;
+      enum {
+	REG_UNSAVED,
+	REG_SAVED_OFFSET,
+	REG_SAVED_REG,
+	REG_SAVED_EXP,
+      } how;
+    } reg[DWARF_FRAME_REGISTERS+1];
+
+    /* Used to implement DW_CFA_remember_state.  */
+    struct frame_state_reg_info *prev;
+  } regs;
+
+  /* The CFA can be described in terms of a reg+offset or a
+     location expression.  */
+  _Unwind_Sword cfa_offset;
+  _Unwind_Word cfa_reg;
+  const unsigned char *cfa_exp;
+  enum {
+    CFA_UNSET,
+    CFA_REG_OFFSET,
+    CFA_EXP,
+  } cfa_how;
+
+  /* The PC described by the current frame state.  */
+  void *pc;
+
+  /* The information we care about from the CIE/FDE.  */
+  _Unwind_Personality_Fn personality;
+  signed int data_align;
+  unsigned int code_align;
+  unsigned char retaddr_column;
+  unsigned char fde_encoding;
+  unsigned char lsda_encoding;
+  unsigned char saw_z;
+  void *eh_ptr;
+} _Unwind_FrameState;
+
+/* Read unaligned data from the instruction buffer.  */
+
+union unaligned
+{
+  void *p;
+  unsigned u2 __attribute__ ((mode (HI)));
+  unsigned u4 __attribute__ ((mode (SI)));
+  unsigned u8 __attribute__ ((mode (DI)));
+  signed s2 __attribute__ ((mode (HI)));
+  signed s4 __attribute__ ((mode (SI)));
+  signed s8 __attribute__ ((mode (DI)));
+} __attribute__ ((packed));
+
+static inline void *
+read_pointer (const void *p) { const union unaligned *up = p; return up->p; }
+
+static inline int
+read_1u (const void *p) { return *(const unsigned char *)p; }
+
+static inline int
+read_1s (const void *p) { return *(const signed char *)p; }
+
+static inline int
+read_2u (const void *p) { const union unaligned *up = p; return up->u2; }
+
+static inline int
+read_2s (const void *p) { const union unaligned *up = p; return up->s2; }
+
+static inline unsigned int
+read_4u (const void *p) { const union unaligned *up = p; return up->u4; }
+
+static inline int
+read_4s (const void *p) { const union unaligned *up = p; return up->s4; }
+
+static inline unsigned long
+read_8u (const void *p) { const union unaligned *up = p; return up->u8; }
+
+static inline unsigned long
+read_8s (const void *p) { const union unaligned *up = p; return up->s8; }
+
+/* Get the value of register REG as saved in CONTEXT.  */
+
+inline _Unwind_Word
+_Unwind_GetGR (struct _Unwind_Context *context, int index)
+{
+  /* This will segfault if the register hasn't been saved.  */
+  return * (_Unwind_Word *) context->reg[index];
+}
+
+/* Overwrite the saved value for register REG in CONTEXT with VAL.  */
+
+inline void
+_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
+{
+  * (_Unwind_Word *) context->reg[index] = val;
+}
+
+/* Retrieve the return address for CONTEXT.  */
+
+inline _Unwind_Ptr
+_Unwind_GetIP (struct _Unwind_Context *context)
+{
+  return (_Unwind_Ptr) context->ra;
+}
+
+/* Overwrite the return address for CONTEXT with VAL.  */
+
+inline void
+_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
+{
+  context->ra = (void *) val;
+}
+
+void *
+_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
+{
+  return context->lsda;
+}
+
+_Unwind_Ptr
+_Unwind_GetRegionStart (struct _Unwind_Context *context)
+{
+  return (_Unwind_Ptr) context->bases.func;
+}
+
+#ifndef __ia64__
+_Unwind_Ptr
+_Unwind_GetDataRelBase (struct _Unwind_Context *context)
+{
+  return (_Unwind_Ptr) context->bases.dbase;
+}
+
+_Unwind_Ptr
+_Unwind_GetTextRelBase (struct _Unwind_Context *context)
+{
+  return (_Unwind_Ptr) context->bases.tbase;
+}
+#endif
+
+/* Extract any interesting information from the CIE for the translation
+   unit F belongs to.  Return a pointer to the byte after the augmentation,
+   or NULL if we encountered an undecipherable augmentation.  */
+
+static const unsigned char *
+extract_cie_info (struct dwarf_cie *cie, struct _Unwind_Context *context,
+		  _Unwind_FrameState *fs)
+{
+  const unsigned char *aug = cie->augmentation;
+  const unsigned char *p = aug + strlen (aug) + 1;
+  const unsigned char *ret = NULL;
+  _Unwind_Ptr tmp;
+
+  /* g++ v2 "eh" has pointer immediately following augmentation string,
+     so it must be handled first.  */
+  if (aug[0] == 'e' && aug[1] == 'h')
+    {
+      fs->eh_ptr = read_pointer (p);
+      p += sizeof (void *);
+      aug += 2;
+    }
+
+  /* Immediately following the augmentation are the code and
+     data alignment and return address column.  */
+  p = read_uleb128 (p, &tmp); fs->code_align = tmp;
+  p = read_sleb128 (p, &tmp); fs->data_align = (saddr) tmp;
+  fs->retaddr_column = *p++;
+  fs->lsda_encoding = DW_EH_PE_omit;
+
+  /* If the augmentation starts with 'z', then a uleb128 immediately
+     follows containing the length of the augmentation field following
+     the size.  */
+  if (*aug == 'z')
+    {
+      p = read_uleb128 (p, &tmp);
+      ret = p + tmp;
+
+      fs->saw_z = 1;
+      ++aug;
+    }
+
+  /* Iterate over recognized augmentation subsequences.  */
+  while (*aug != '\0')
+    {
+      /* "L" indicates a byte showing how the LSDA pointer is encoded.  */
+      if (aug[0] == 'L')
+	{
+	  fs->lsda_encoding = *p++;
+	  aug += 1;
+	}
+
+      /* "R" indicates a byte indicating how FDE addresses are encoded.  */
+      else if (aug[0] == 'R')
+	{
+	  fs->fde_encoding = *p++;
+	  aug += 1;
+	}
+
+      /* "P" indicates a personality routine in the CIE augmentation.  */
+      else if (aug[0] == 'P')
+	{
+	  p = read_encoded_value (context, *p, p + 1,
+				  (_Unwind_Ptr *) &fs->personality);
+	  aug += 1;
+	}
+
+      /* Otherwise we have an unknown augmentation string.
+	 Bail unless we saw a 'z' prefix.  */
+      else
+	return ret;
+    }
+
+  return ret ? ret : p;
+}
+
+#ifndef _LIBC
+/* Decode a DW_OP stack program.  Return the top of stack.  Push INITIAL
+   onto the stack to start.  */
+
+static _Unwind_Word
+execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end,
+		  struct _Unwind_Context *context, _Unwind_Word initial)
+{
+  _Unwind_Word stack[64];	/* ??? Assume this is enough. */
+  int stack_elt;
+
+  stack[0] = initial;
+  stack_elt = 1;
+
+  while (op_ptr < op_end)
+    {
+      enum dwarf_location_atom op = *op_ptr++;
+      _Unwind_Word result = 0, reg;
+      _Unwind_Sword offset;
+      _Unwind_Ptr ptrtmp;
+
+      switch (op)
+	{
+	case DW_OP_lit0:
+	case DW_OP_lit1:
+	case DW_OP_lit2:
+	case DW_OP_lit3:
+	case DW_OP_lit4:
+	case DW_OP_lit5:
+	case DW_OP_lit6:
+	case DW_OP_lit7:
+	case DW_OP_lit8:
+	case DW_OP_lit9:
+	case DW_OP_lit10:
+	case DW_OP_lit11:
+	case DW_OP_lit12:
+	case DW_OP_lit13:
+	case DW_OP_lit14:
+	case DW_OP_lit15:
+	case DW_OP_lit16:
+	case DW_OP_lit17:
+	case DW_OP_lit18:
+	case DW_OP_lit19:
+	case DW_OP_lit20:
+	case DW_OP_lit21:
+	case DW_OP_lit22:
+	case DW_OP_lit23:
+	case DW_OP_lit24:
+	case DW_OP_lit25:
+	case DW_OP_lit26:
+	case DW_OP_lit27:
+	case DW_OP_lit28:
+	case DW_OP_lit29:
+	case DW_OP_lit30:
+	case DW_OP_lit31:
+	  result = op - DW_OP_lit0;
+	  break;
+
+	case DW_OP_addr:
+	  result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr);
+	  op_ptr += sizeof (void *);
+	  break;
+
+	case DW_OP_const1u:
+	  result = read_1u (op_ptr);
+	  op_ptr += 1;
+	  break;
+	case DW_OP_const1s:
+	  result = read_1s (op_ptr);
+	  op_ptr += 1;
+	  break;
+	case DW_OP_const2u:
+	  result = read_2u (op_ptr);
+	  op_ptr += 2;
+	  break;
+	case DW_OP_const2s:
+	  result = read_2s (op_ptr);
+	  op_ptr += 2;
+	  break;
+	case DW_OP_const4u:
+	  result = read_4u (op_ptr);
+	  op_ptr += 4;
+	  break;
+	case DW_OP_const4s:
+	  result = read_4s (op_ptr);
+	  op_ptr += 4;
+	  break;
+	case DW_OP_const8u:
+	  result = read_8u (op_ptr);
+	  op_ptr += 8;
+	  break;
+	case DW_OP_const8s:
+	  result = read_8s (op_ptr);
+	  op_ptr += 8;
+	  break;
+	case DW_OP_constu:
+	  op_ptr = read_uleb128 (op_ptr, &ptrtmp);
+	  result = ptrtmp;
+	  break;
+	case DW_OP_consts:
+	  op_ptr = read_sleb128 (op_ptr, &ptrtmp);
+	  result = (saddr)ptrtmp;
+	  break;
+
+	case DW_OP_reg0:
+	case DW_OP_reg1:
+	case DW_OP_reg2:
+	case DW_OP_reg3:
+	case DW_OP_reg4:
+	case DW_OP_reg5:
+	case DW_OP_reg6:
+	case DW_OP_reg7:
+	case DW_OP_reg8:
+	case DW_OP_reg9:
+	case DW_OP_reg10:
+	case DW_OP_reg11:
+	case DW_OP_reg12:
+	case DW_OP_reg13:
+	case DW_OP_reg14:
+	case DW_OP_reg15:
+	case DW_OP_reg16:
+	case DW_OP_reg17:
+	case DW_OP_reg18:
+	case DW_OP_reg19:
+	case DW_OP_reg20:
+	case DW_OP_reg21:
+	case DW_OP_reg22:
+	case DW_OP_reg23:
+	case DW_OP_reg24:
+	case DW_OP_reg25:
+	case DW_OP_reg26:
+	case DW_OP_reg27:
+	case DW_OP_reg28:
+	case DW_OP_reg29:
+	case DW_OP_reg30:
+	case DW_OP_reg31:
+	  result = _Unwind_GetGR (context, op - DW_OP_reg0);
+	  break;
+	case DW_OP_regx:
+	  op_ptr = read_uleb128 (op_ptr, &ptrtmp); reg = ptrtmp;
+	  result = _Unwind_GetGR (context, reg);
+	  break;
+
+	case DW_OP_breg0:
+	case DW_OP_breg1:
+	case DW_OP_breg2:
+	case DW_OP_breg3:
+	case DW_OP_breg4:
+	case DW_OP_breg5:
+	case DW_OP_breg6:
+	case DW_OP_breg7:
+	case DW_OP_breg8:
+	case DW_OP_breg9:
+	case DW_OP_breg10:
+	case DW_OP_breg11:
+	case DW_OP_breg12:
+	case DW_OP_breg13:
+	case DW_OP_breg14:
+	case DW_OP_breg15:
+	case DW_OP_breg16:
+	case DW_OP_breg17:
+	case DW_OP_breg18:
+	case DW_OP_breg19:
+	case DW_OP_breg20:
+	case DW_OP_breg21:
+	case DW_OP_breg22:
+	case DW_OP_breg23:
+	case DW_OP_breg24:
+	case DW_OP_breg25:
+	case DW_OP_breg26:
+	case DW_OP_breg27:
+	case DW_OP_breg28:
+	case DW_OP_breg29:
+	case DW_OP_breg30:
+	case DW_OP_breg31:
+	  op_ptr = read_sleb128 (op_ptr, &ptrtmp); offset = (saddr)ptrtmp;
+	  result = _Unwind_GetGR (context, op - DW_OP_breg0) + offset;
+	  break;
+	case DW_OP_bregx:
+	  op_ptr = read_uleb128 (op_ptr, &ptrtmp); reg = ptrtmp;
+	  op_ptr = read_sleb128 (op_ptr, &ptrtmp); offset = (saddr)ptrtmp;
+	  result = _Unwind_GetGR (context, reg) + offset;
+	  break;
+
+	case DW_OP_dup:
+	  if (stack_elt < 1)
+	    abort ();
+	  result = stack[stack_elt - 1];
+	  break;
+
+	case DW_OP_drop:
+	  if (--stack_elt < 0)
+	    abort ();
+	  goto no_push;
+
+	case DW_OP_pick:
+	  offset = *op_ptr++;
+	  if (offset >= stack_elt - 1)
+	    abort ();
+	  result = stack[stack_elt - 1 - offset];
+	  break;
+
+	case DW_OP_over:
+	  if (stack_elt < 2)
+	    abort ();
+	  result = stack[stack_elt - 2];
+	  break;
+
+	case DW_OP_rot:
+	  {
+	    _Unwind_Word t1, t2, t3;
+
+	    if (stack_elt < 3)
+	      abort ();
+	    t1 = stack[stack_elt - 1];
+	    t2 = stack[stack_elt - 2];
+	    t3 = stack[stack_elt - 3];
+	    stack[stack_elt - 1] = t2;
+	    stack[stack_elt - 2] = t3;
+	    stack[stack_elt - 3] = t1;
+	    goto no_push;
+	  }
+
+	case DW_OP_deref:
+	case DW_OP_deref_size:
+	case DW_OP_abs:
+	case DW_OP_neg:
+	case DW_OP_not:
+	case DW_OP_plus_uconst:
+	  /* Unary operations.  */
+	  if (--stack_elt < 0)
+	    abort ();
+	  result = stack[stack_elt];
+
+	  switch (op)
+	    {
+	    case DW_OP_deref:
+	      {
+		void *ptr = (void *)(_Unwind_Ptr) result;
+		result = (_Unwind_Ptr) read_pointer (ptr);
+	      }
+	      break;
+
+	    case DW_OP_deref_size:
+	      {
+		void *ptr = (void *)(_Unwind_Ptr) result;
+		switch (*op_ptr++)
+		  {
+		  case 1:
+		    result = read_1u (ptr);
+		    break;
+		  case 2:
+		    result = read_2u (ptr);
+		    break;
+		  case 4:
+		    result = read_4u (ptr);
+		    break;
+		  case 8:
+		    result = read_8u (ptr);
+		    break;
+		  default:
+		    abort ();
+		  }
+	      }
+	      break;
+
+	    case DW_OP_abs:
+	      if ((_Unwind_Sword) result < 0)
+		result = -result;
+	      break;
+	    case DW_OP_neg:
+	      result = -result;
+	      break;
+	    case DW_OP_not:
+	      result = ~result;
+	      break;
+	    case DW_OP_plus_uconst:
+	      op_ptr = read_uleb128 (op_ptr, &ptrtmp); reg = ptrtmp;
+	      result += reg;
+	      break;
+	    /* Avoid warnings.  */
+	    default:
+	      break;
+	    }
+	  break;
+
+	case DW_OP_and:
+	case DW_OP_div:
+	case DW_OP_minus:
+	case DW_OP_mod:
+	case DW_OP_mul:
+	case DW_OP_or:
+	case DW_OP_plus:
+	case DW_OP_le:
+	case DW_OP_ge:
+	case DW_OP_eq:
+	case DW_OP_lt:
+	case DW_OP_gt:
+	case DW_OP_ne:
+	  {
+	    /* Binary operations.  */
+	    _Unwind_Word first, second;
+	  if ((stack_elt -= 2) < 0)
+	    abort ();
+	  second = stack[stack_elt];
+	  first = stack[stack_elt + 1];
+
+	  switch (op)
+	    {
+	    case DW_OP_and:
+	      result = second & first;
+	      break;
+	    case DW_OP_div:
+	      result = (_Unwind_Sword)second / (_Unwind_Sword)first;
+	      break;
+	    case DW_OP_minus:
+	      result = second - first;
+	      break;
+	    case DW_OP_mod:
+	      result = (_Unwind_Sword)second % (_Unwind_Sword)first;
+	      break;
+	    case DW_OP_mul:
+	      result = second * first;
+	      break;
+	    case DW_OP_or:
+	      result = second | first;
+	      break;
+	    case DW_OP_plus:
+	      result = second + first;
+	      break;
+	    case DW_OP_shl:
+	      result = second << first;
+	      break;
+	    case DW_OP_shr:
+	      result = second >> first;
+	      break;
+	    case DW_OP_shra:
+	      result = (_Unwind_Sword)second >> first;
+	      break;
+	    case DW_OP_xor:
+	      result = second ^ first;
+	      break;
+	    case DW_OP_le:
+	      result = (_Unwind_Sword)first <= (_Unwind_Sword)second;
+	      break;
+	    case DW_OP_ge:
+	      result = (_Unwind_Sword)first >= (_Unwind_Sword)second;
+	      break;
+	    case DW_OP_eq:
+	      result = (_Unwind_Sword)first == (_Unwind_Sword)second;
+	      break;
+	    case DW_OP_lt:
+	      result = (_Unwind_Sword)first < (_Unwind_Sword)second;
+	      break;
+	    case DW_OP_gt:
+	      result = (_Unwind_Sword)first > (_Unwind_Sword)second;
+	      break;
+	    case DW_OP_ne:
+	      result = (_Unwind_Sword)first != (_Unwind_Sword)second;
+	      break;
+	    default:
+	      /* Avoid warnings.  */
+	      break;
+	    }
+	  }
+	  break;
+
+	case DW_OP_skip:
+	  offset = read_2s (op_ptr);
+	  op_ptr += 2;
+	  op_ptr += offset;
+	  goto no_push;
+
+	case DW_OP_bra:
+	  if (--stack_elt < 0)
+	    abort ();
+	  offset = read_2s (op_ptr);
+	  op_ptr += 2;
+	  if (stack[stack_elt] != 0)
+	    op_ptr += offset;
+	  goto no_push;
+
+	case DW_OP_nop:
+	  goto no_push;
+
+	default:
+	  abort ();
+	}
+
+      /* Most things push a result value.  */
+      if ((size_t) stack_elt >= sizeof(stack)/sizeof(*stack))
+	abort ();
+      stack[++stack_elt] = result;
+    no_push:;
+    }
+
+  /* We were executing this program to get a value.  It should be
+     at top of stack.  */
+  if (--stack_elt < 0)
+    abort ();
+  return stack[stack_elt];
+}
+#endif
+
+/* Decode DWARF 2 call frame information. Takes pointers the
+   instruction sequence to decode, current register information and
+   CIE info, and the PC range to evaluate.  */
+
+static void
+execute_cfa_program (const unsigned char *insn_ptr,
+		     const unsigned char *insn_end,
+		     struct _Unwind_Context *context,
+		     _Unwind_FrameState *fs)
+{
+  struct frame_state_reg_info *unused_rs = NULL;
+
+  /* Don't allow remember/restore between CIE and FDE programs.  */
+  fs->regs.prev = NULL;
+
+  while (insn_ptr < insn_end && fs->pc < context->ra)
+    {
+      unsigned char insn = *insn_ptr++;
+      _Unwind_Word reg;
+      _Unwind_Sword offset;
+      _Unwind_Ptr ptrtmp;
+
+      if (insn & DW_CFA_advance_loc)
+	fs->pc += (insn & 0x3f) * fs->code_align;
+      else if (insn & DW_CFA_offset)
+	{
+	  reg = insn & 0x3f;
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  offset = ptrtmp * fs->data_align;
+	  fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+	  fs->regs.reg[reg].loc.offset = offset;
+	}
+      else if (insn & DW_CFA_restore)
+	{
+	  reg = insn & 0x3f;
+	  fs->regs.reg[reg].how = REG_UNSAVED;
+	}
+      else switch (insn)
+	{
+	case DW_CFA_set_loc:
+	  insn_ptr = read_encoded_value (context, fs->fde_encoding,
+					 insn_ptr, (_Unwind_Ptr *) &fs->pc);
+	  break;
+
+	case DW_CFA_advance_loc1:
+	  fs->pc += read_1u (insn_ptr) * fs->code_align;
+	  insn_ptr += 1;
+	  break;
+	case DW_CFA_advance_loc2:
+	  fs->pc += read_2u (insn_ptr) * fs->code_align;
+	  insn_ptr += 2;
+	  break;
+	case DW_CFA_advance_loc4:
+	  fs->pc += read_4u (insn_ptr) * fs->code_align;
+	  insn_ptr += 4;
+	  break;
+
+	case DW_CFA_offset_extended:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp); reg = ptrtmp;
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  offset = ptrtmp * fs->data_align;
+	  fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+	  fs->regs.reg[reg].loc.offset = offset;
+	  break;
+
+	case DW_CFA_restore_extended:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp); reg = ptrtmp;
+	  fs->regs.reg[reg].how = REG_UNSAVED;
+	  break;
+
+	case DW_CFA_undefined:
+	case DW_CFA_same_value:
+	case DW_CFA_nop:
+	  break;
+
+	case DW_CFA_register:
+	  {
+	    _Unwind_Word reg2;
+	    insn_ptr = read_uleb128 (insn_ptr, &ptrtmp); reg = ptrtmp;
+	    insn_ptr = read_uleb128 (insn_ptr, &ptrtmp); reg2 = ptrtmp;
+	    fs->regs.reg[reg].how = REG_SAVED_REG;
+	    fs->regs.reg[reg].loc.reg = reg2;
+	  }
+	  break;
+      
+	case DW_CFA_remember_state:
+	  {
+	    struct frame_state_reg_info *new_rs;
+	    if (unused_rs)
+	      {
+		new_rs = unused_rs;
+		unused_rs = unused_rs->prev;
+	      }
+	    else
+	      new_rs = alloca (sizeof (struct frame_state_reg_info));
+
+	    *new_rs = fs->regs;
+	    fs->regs.prev = new_rs;
+	  }
+	  break;
+
+	case DW_CFA_restore_state:
+	  {
+	    struct frame_state_reg_info *old_rs = fs->regs.prev;
+	    fs->regs = *old_rs;
+	    old_rs->prev = unused_rs;
+	    unused_rs = old_rs;
+	  }
+	  break;
+
+	case DW_CFA_def_cfa:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_reg = ptrtmp;
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_offset = ptrtmp;
+	  fs->cfa_how = CFA_REG_OFFSET;
+	  break;
+
+	case DW_CFA_def_cfa_register:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_reg = ptrtmp;
+	  fs->cfa_how = CFA_REG_OFFSET;
+	  break;
+
+	case DW_CFA_def_cfa_offset:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_offset = ptrtmp;
+	  /* cfa_how deliberately not set.  */
+	  break;
+
+	case DW_CFA_def_cfa_expression:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_exp = insn_ptr;
+	  fs->cfa_how = CFA_EXP;
+	  insn_ptr += ptrtmp;
+	  break;
+
+	case DW_CFA_expression:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp); reg = ptrtmp;
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->regs.reg[reg].how = REG_SAVED_EXP;
+	  fs->regs.reg[reg].loc.exp = insn_ptr;
+	  insn_ptr += ptrtmp;
+	  break;
+
+	  /* From the 2.1 draft.  */
+	case DW_CFA_offset_extended_sf:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp); reg = ptrtmp;
+	  insn_ptr = read_sleb128 (insn_ptr, &ptrtmp);
+	  offset = (saddr)ptrtmp * fs->data_align;
+	  fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+	  fs->regs.reg[reg].loc.offset = offset;
+	  break;
+	  
+	case DW_CFA_def_cfa_sf:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_reg = ptrtmp;
+	  insn_ptr = read_sleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_offset = (saddr)ptrtmp;
+	  fs->cfa_how = CFA_REG_OFFSET;
+	  break;
+
+	case DW_CFA_def_cfa_offset_sf:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  fs->cfa_offset = ptrtmp;
+	  /* cfa_how deliberately not set.  */
+	  break;
+
+	case DW_CFA_GNU_window_save:
+	  /* ??? Hardcoded for SPARC register window configuration.  */
+	  for (reg = 16; reg < 32; ++reg)
+	    {
+	      fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+	      fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *);
+	    }
+	  break;
+
+	case DW_CFA_GNU_args_size:
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  context->args_size = ptrtmp;
+	  break;
+
+	case DW_CFA_GNU_negative_offset_extended:
+	  /* Obsoleted by DW_CFA_offset_extended_sf, but used by
+	     older PowerPC code.  */
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp); reg = ptrtmp;
+	  insn_ptr = read_uleb128 (insn_ptr, &ptrtmp);
+	  offset = ptrtmp * fs->data_align;
+	  fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+	  fs->regs.reg[reg].loc.offset = -offset;
+	  break;
+
+	default:
+	  abort ();
+	}
+    }
+}
+
+static _Unwind_Reason_Code
+uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+  struct dwarf_fde *fde;
+  struct dwarf_cie *cie;
+  const unsigned char *aug, *insn, *end;
+
+  memset (fs, 0, sizeof (*fs));
+  context->args_size = 0;
+  context->lsda = 0;
+
+  fde = _Unwind_Find_FDE (context->ra - 1, &context->bases);
+  if (fde == NULL)
+    {
+      /* Couldn't find frame unwind info for this function.  Try a
+	 target-specific fallback mechanism.  This will necessarily
+	 not profide a personality routine or LSDA.  */
+#ifdef MD_FALLBACK_FRAME_STATE_FOR
+      MD_FALLBACK_FRAME_STATE_FOR (context, fs, success);
+      return _URC_END_OF_STACK;
+    success:
+      return _URC_NO_REASON;
+#else
+      return _URC_END_OF_STACK;
+#endif
+    }
+
+  fs->pc = context->bases.func;
+
+  cie = get_cie (fde);
+  insn = extract_cie_info (cie, context, fs);
+  if (insn == NULL)
+    /* CIE contained unknown augmentation.  */
+    return _URC_FATAL_PHASE1_ERROR;
+
+  /* First decode all the insns in the CIE.  */
+  end = (unsigned char *) next_fde ((struct dwarf_fde *) cie);
+  execute_cfa_program (insn, end, context, fs);
+
+  /* Locate augmentation for the fde.  */
+  aug = (unsigned char *)fde + sizeof (*fde);
+  aug += 2 * size_of_encoded_value (fs->fde_encoding);
+  insn = NULL;
+  if (fs->saw_z)
+    {
+      _Unwind_Ptr i;
+      aug = read_uleb128 (aug, &i);
+      insn = aug + i;
+    }
+  if (fs->lsda_encoding != DW_EH_PE_omit)
+    aug = read_encoded_value (context, fs->lsda_encoding, aug,
+			      (_Unwind_Ptr *) &context->lsda);
+
+  /* Then the insns in the FDE up to our target PC.  */
+  if (insn == NULL)
+    insn = aug;
+  end = (unsigned char *) next_fde (fde);
+  execute_cfa_program (insn, end, context, fs);
+
+  return _URC_NO_REASON;
+}
+
+typedef struct frame_state
+{
+  void *cfa;
+  void *eh_ptr;
+  long cfa_offset;
+  long args_size;
+  long reg_or_offset[DWARF_FRAME_REGISTERS+1];
+  unsigned short cfa_reg;
+  unsigned short retaddr_column;
+  char saved[DWARF_FRAME_REGISTERS+1];
+} frame_state;
+
+struct frame_state * __frame_state_for (void *, struct frame_state *);
+
+/* Called from pre-G++ 3.0 __throw to find the registers to restore for
+   a given PC_TARGET.  The caller should allocate a local variable of
+   `struct frame_state' and pass its address to STATE_IN.  */
+
+struct frame_state *
+__frame_state_for (void *pc_target, struct frame_state *state_in)
+{
+  struct _Unwind_Context context;
+  _Unwind_FrameState fs;
+  int reg;
+
+  memset (&context, 0, sizeof (struct _Unwind_Context));
+  context.ra = pc_target + 1;
+
+  if (uw_frame_state_for (&context, &fs) != _URC_NO_REASON)
+    return 0;
+
+  /* We have no way to pass a location expression for the CFA to our
+     caller.  It wouldn't understand it anyway.  */
+  if (fs.cfa_how == CFA_EXP)
+    return 0;
+
+  for (reg = 0; reg < DWARF_FRAME_REGISTERS + 1; reg++)
+    {
+      state_in->saved[reg] = fs.regs.reg[reg].how;
+      switch (state_in->saved[reg])
+	{
+	case REG_SAVED_REG:
+	  state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.reg;
+	  break;
+	case REG_SAVED_OFFSET:
+	  state_in->reg_or_offset[reg] = fs.regs.reg[reg].loc.offset;
+	  break;
+	default:
+	  state_in->reg_or_offset[reg] = 0;
+	  break;
+	}
+    }
+
+  state_in->cfa_offset = fs.cfa_offset;
+  state_in->cfa_reg = fs.cfa_reg;
+  state_in->retaddr_column = fs.retaddr_column;
+  state_in->args_size = context.args_size;
+  state_in->eh_ptr = fs.eh_ptr;
+
+  return state_in;
+}
+
+#ifndef _LIBC
+
+static void
+uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+  struct _Unwind_Context orig_context = *context;
+  void *cfa;
+  long i;
+
+  /* Compute this frame's CFA.  */
+  switch (fs->cfa_how)
+    {
+    case CFA_REG_OFFSET:
+      /* Special handling here: Many machines do not use a frame pointer,
+	 and track the CFA only through offsets from the stack pointer from
+	 one frame to the next.  In this case, the stack pointer is never
+	 stored, so it has no saved address in the context.  What we do 
+	 have is the CFA from the previous stack frame.  */
+      if (context->reg[fs->cfa_reg] == NULL)
+	cfa = context->cfa;
+      else
+	cfa = (void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->cfa_reg);
+      cfa += fs->cfa_offset;
+      break;
+
+    case CFA_EXP:
+      /* ??? No way of knowing what register number is the stack pointer
+	 to do the same sort of handling as above.  Assume that if the
+	 CFA calculation is so complicated as to require a stack program
+	 that this will not be a problem.  */
+      {
+	const unsigned char *exp = fs->cfa_exp;
+	_Unwind_Ptr len;
+
+	exp = read_uleb128 (exp, &len);
+	cfa = (void *) (_Unwind_Ptr)
+	  execute_stack_op (exp, exp + len, context, 0);
+	break;
+      }
+
+    default:
+      abort ();
+    }
+  context->cfa = cfa;
+
+  /* Compute the addresses of all registers saved in this frame.  */
+  for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i)
+    switch (fs->regs.reg[i].how)
+      {
+      case REG_UNSAVED:
+	break;
+      case REG_SAVED_OFFSET:
+	context->reg[i] = cfa + fs->regs.reg[i].loc.offset;
+	break;
+      case REG_SAVED_REG:
+	context->reg[i] = orig_context.reg[fs->regs.reg[i].loc.reg];
+	break;
+      case REG_SAVED_EXP:
+	{
+	  const unsigned char *exp = fs->regs.reg[i].loc.exp;
+	  _Unwind_Ptr len;
+	  _Unwind_Ptr val;
+
+	  exp = read_uleb128 (exp, &len);
+	  val = execute_stack_op (exp, exp + len, &orig_context,
+				  (_Unwind_Ptr) cfa);
+	  context->reg[i] = (void *) val;
+	}
+	break;
+      }
+}
+
+static void
+uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+  uw_update_context_1 (context, fs);
+
+  /* Compute the return address now, since the return address column
+     can change from frame to frame.  */
+  context->ra = __builtin_extract_return_addr
+    ((void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->retaddr_column));
+}
+
+/* Fill in CONTEXT for top-of-stack.  The only valid registers at this
+   level will be the return address and the CFA.  */
+   
+#define uw_init_context(CONTEXT)					\
+do {									\
+  /* Do any necessary initialization to access arbitrary stack frames.	\
+     On the SPARC, this means flushing the register windows.  */	\
+  __builtin_unwind_init ();						\
+  uw_init_context_1 (CONTEXT, __builtin_dwarf_cfa (),			\
+		     __builtin_return_address (0));			\
+} while (0)
+
+static void
+uw_init_context_1 (struct _Unwind_Context *context,
+		   void *outer_cfa, void *outer_ra)
+{
+  void *ra = __builtin_extract_return_addr (__builtin_return_address (0));
+  _Unwind_FrameState fs;
+
+  memset (context, 0, sizeof (struct _Unwind_Context));
+  context->ra = ra;
+
+  if (uw_frame_state_for (context, &fs) != _URC_NO_REASON)
+    abort ();
+
+  /* Force the frame state to use the known cfa value.  */
+  context->cfa = outer_cfa;
+  fs.cfa_how = CFA_REG_OFFSET;
+  fs.cfa_reg = 0;
+  fs.cfa_offset = 0;
+
+  uw_update_context_1 (context, &fs);
+
+  /* If the return address column was saved in a register in the
+     initialization context, then we can't see it in the given
+     call frame data.  So have the initialization context tell us.  */
+  context->ra = __builtin_extract_return_addr (outer_ra);
+}
+
+
+/* Install TARGET into CURRENT so that we can return to it.  This is a
+   macro because __builtin_eh_return must be invoked in the context of
+   our caller.  */
+
+#define uw_install_context(CURRENT, TARGET)				\
+do {									\
+  long offset = uw_install_context_1 ((CURRENT), (TARGET));		\
+  void *handler = __builtin_frob_return_addr ((TARGET)->ra);		\
+  __builtin_eh_return (offset, handler);				\
+} while (0)
+
+static inline void
+init_dwarf_reg_size_table (void)
+{
+  __builtin_init_dwarf_reg_size_table (dwarf_reg_size_table);
+}
+
+static long
+uw_install_context_1 (struct _Unwind_Context *current,
+		      struct _Unwind_Context *target)
+{
+  long i;
+
+#if __GTHREADS
+  {
+    static __gthread_once_t once_regsizes = __GTHREAD_ONCE_INIT;
+    if (__gthread_once (&once_regsizes, init_dwarf_reg_size_table) != 0
+	|| dwarf_reg_size_table[0] == 0)
+      init_dwarf_reg_size_table ();
+  }
+#else
+  if (dwarf_reg_size_table[0] == 0)
+    init_dwarf_reg_size_table ();
+#endif
+
+  for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
+    {
+      void *c = current->reg[i];
+      void *t = target->reg[i];
+      if (t && c && t != c)
+	memcpy (c, t, dwarf_reg_size_table[i]);
+    }
+
+  /* We adjust SP by the difference between CURRENT and TARGET's CFA.  */
+  if (STACK_GROWS_DOWNWARD)
+    return target->cfa - current->cfa + target->args_size;
+  else
+    return current->cfa - target->cfa - target->args_size;
+}
+
+static inline _Unwind_Ptr
+uw_identify_context (struct _Unwind_Context *context)
+{
+  return _Unwind_GetIP (context);
+}
+
+
+#include "unwind.inc"
+
+#endif /* _LIBC */
+#endif /* !USING_SJLJ_EXCEPTIONS */