/* DWARF2 exception handling and frame unwind runtime interface routines.
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
+ Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
Free Software Foundation, Inc.
This file is part of GCC.
#include "unwind-pe.h"
#include "unwind-dw2-fde.h"
#include "gthr.h"
-
+#include "unwind-dw2.h"
#ifndef __USING_SJLJ_EXCEPTIONS__
#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
-
/* Dwarf frame registers used for pre gcc 3.0 compiled glibc. */
#ifndef PRE_GCC3_DWARF_FRAME_REGISTERS
#define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS
#define DWARF_REG_TO_UNWIND_COLUMN(REGNO) (REGNO)
#endif
-/* A target can do some update context frobbing. */
-#ifndef MD_FROB_UPDATE_CONTEXT
-#define MD_FROB_UPDATE_CONTEXT(CTX, FS) do { } while (0)
-#endif
-
/* This is the register and unwind state for a particular frame. This
provides the information necessary to unwind up past a frame and return
to its caller. */
static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS+1];
\f
-/* 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 {
- _Unwind_Word 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;
- _Unwind_Sword data_align;
- _Unwind_Word code_align;
- unsigned char retaddr_column;
- unsigned char fde_encoding;
- unsigned char lsda_encoding;
- unsigned char saw_z;
- void *eh_ptr;
-} _Unwind_FrameState;
-\f
/* Read unaligned data from the instruction buffer. */
union unaligned
int size;
void *ptr;
+#ifdef DWARF_ZERO_REG
+ if (index == DWARF_ZERO_REG)
+ return 0;
+#endif
+
index = DWARF_REG_TO_UNWIND_COLUMN (index);
if (index >= (int) sizeof(dwarf_reg_size_table))
abort ();
return (_Unwind_Ptr) context->bases.tbase;
}
#endif
+
+#ifdef MD_UNWIND_SUPPORT
+#include MD_UNWIND_SUPPORT
+#endif
\f
/* Extract any interesting information from the CIE for the translation
unit F belongs to. Return a pointer to the byte after the augmentation,
_Unwind_FrameState *fs)
{
const unsigned char *aug = cie->augmentation;
- const unsigned char *p = aug + strlen (aug) + 1;
+ const unsigned char *p = aug + strlen ((const char *)aug) + 1;
const unsigned char *ret = NULL;
_Unwind_Word utmp;
data alignment and return address column. */
p = read_uleb128 (p, &fs->code_align);
p = read_sleb128 (p, &fs->data_align);
- fs->retaddr_column = *p++;
+ if (cie->version == 1)
+ fs->retaddr_column = *p++;
+ else
+ p = read_uleb128 (p, &fs->retaddr_column);
fs->lsda_encoding = DW_EH_PE_omit;
/* If the augmentation starts with 'z', then a uleb128 immediately
case DW_OP_mul:
case DW_OP_or:
case DW_OP_plus:
+ case DW_OP_shl:
+ case DW_OP_shr:
+ case DW_OP_shra:
+ case DW_OP_xor:
case DW_OP_le:
case DW_OP_ge:
case DW_OP_eq:
case DW_CFA_restore_extended:
insn_ptr = read_uleb128 (insn_ptr, ®);
+ /* FIXME, this is wrong; the CIE might have said that the
+ register was saved somewhere. */
fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNSAVED;
break;
case DW_CFA_undefined:
case DW_CFA_same_value:
insn_ptr = read_uleb128 (insn_ptr, ®);
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNSAVED;
break;
case DW_CFA_nop:
unused_rs = unused_rs->prev;
}
else
- new_rs = __builtin_alloca (sizeof (struct frame_state_reg_info));
+ new_rs = alloca (sizeof (struct frame_state_reg_info));
*new_rs = fs->regs;
fs->regs.prev = new_rs;
fde = _Unwind_Find_FDE (context->ra - 1, &context->bases);
if (fde == NULL)
{
+#ifdef MD_FALLBACK_FRAME_STATE_FOR
/* Couldn't find frame unwind info for this function. Try a
target-specific fallback mechanism. This will necessarily
not provide 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;
+ return MD_FALLBACK_FRAME_STATE_FOR (context, fs);
#else
return _URC_END_OF_STACK;
#endif
break;
}
+#ifdef MD_FROB_UPDATE_CONTEXT
MD_FROB_UPDATE_CONTEXT (context, fs);
+#endif
}
/* CONTEXT describes the unwind state for a frame, and FS describes the FDE
struct _Unwind_Context *target)
{
long i;
+ _Unwind_SpTmp sp_slot;
+
+ /* If the target frame does not have a saved stack pointer,
+ then set up the target's CFA. */
+ if (!_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ()))
+ _Unwind_SetSpColumn (target, target->cfa, &sp_slot);
for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
{
memcpy (c, t, dwarf_reg_size_table[i]);
}
-#ifdef EH_RETURN_STACKADJ_RTX
- {
- void *target_cfa;
+ /* If the current frame doesn't have a saved stack pointer, then we
+ need to rely on EH_RETURN_STACKADJ_RTX to get our target stack
+ pointer value reloaded. */
+ if (!_Unwind_GetGRPtr (current, __builtin_dwarf_sp_column ()))
+ {
+ void *target_cfa;
- /* If the last frame records a saved stack pointer, use it. */
- if (_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ()))
target_cfa = _Unwind_GetPtr (target, __builtin_dwarf_sp_column ());
- else
- target_cfa = target->cfa;
-
- /* 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;
- }
-#else
+
+ /* 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;
+ }
return 0;
-#endif
}
static inline _Unwind_Ptr
#include "unwind.inc"
+#if defined (USE_GAS_SYMVER) && defined (SHARED) && defined (USE_LIBUNWIND_EXCEPTIONS)
+alias (_Unwind_Backtrace);
+alias (_Unwind_DeleteException);
+alias (_Unwind_FindEnclosingFunction);
+alias (_Unwind_ForcedUnwind);
+alias (_Unwind_GetDataRelBase);
+alias (_Unwind_GetTextRelBase);
+alias (_Unwind_GetCFA);
+alias (_Unwind_GetGR);
+alias (_Unwind_GetIP);
+alias (_Unwind_GetLanguageSpecificData);
+alias (_Unwind_GetRegionStart);
+alias (_Unwind_RaiseException);
+alias (_Unwind_Resume);
+alias (_Unwind_Resume_or_Rethrow);
+alias (_Unwind_SetGR);
+alias (_Unwind_SetIP);
+#endif
+
#endif /* !USING_SJLJ_EXCEPTIONS */
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