/* 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, 2006
Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
+ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+ 02110-1301, USA. */
#include "tconfig.h"
#include "tsystem.h"
#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. */
void *lsda;
struct dwarf_eh_bases bases;
_Unwind_Word args_size;
+ char signal_frame;
+ char by_value[DWARF_FRAME_REGISTERS+1];
};
/* Byte size of every register managed by these routines. */
static inline unsigned long
read_8s (const void *p) { const union unaligned *up = p; return up->s8; }
\f
-/* Get the value of register REG as saved in CONTEXT. */
+/* Get the value of register INDEX as saved in CONTEXT. */
inline _Unwind_Word
_Unwind_GetGR (struct _Unwind_Context *context, int index)
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 ();
+ gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
size = dwarf_reg_size_table[index];
ptr = context->reg[index];
+ if (context->by_value[index])
+ return (_Unwind_Word) (_Unwind_Internal_Ptr) ptr;
+
/* This will segfault if the register hasn't been saved. */
if (size == sizeof(_Unwind_Ptr))
return * (_Unwind_Ptr *) ptr;
-
- if (size == sizeof(_Unwind_Word))
- return * (_Unwind_Word *) ptr;
-
- abort ();
+ else
+ {
+ gcc_assert (size == sizeof(_Unwind_Word));
+ return * (_Unwind_Word *) ptr;
+ }
}
static inline void *
return (_Unwind_Ptr) context->cfa;
}
-/* Overwrite the saved value for register REG in CONTEXT with VAL. */
+/* Overwrite the saved value for register INDEX in CONTEXT with VAL. */
inline void
_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
void *ptr;
index = DWARF_REG_TO_UNWIND_COLUMN (index);
- if (index >= (int) sizeof(dwarf_reg_size_table))
- abort ();
+ gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
size = dwarf_reg_size_table[index];
+
+ if (context->by_value[index])
+ {
+ context->reg[index] = (void *) (_Unwind_Internal_Ptr) val;
+ return;
+ }
+
ptr = context->reg[index];
if (size == sizeof(_Unwind_Ptr))
* (_Unwind_Ptr *) ptr = val;
- else if (size == sizeof(_Unwind_Word))
- * (_Unwind_Word *) ptr = val;
else
- abort ();
+ {
+ gcc_assert (size == sizeof(_Unwind_Word));
+ * (_Unwind_Word *) ptr = val;
+ }
}
/* Get the pointer to a register INDEX as saved in CONTEXT. */
_Unwind_GetGRPtr (struct _Unwind_Context *context, int index)
{
index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ if (context->by_value[index])
+ return &context->reg[index];
return context->reg[index];
}
_Unwind_SetGRPtr (struct _Unwind_Context *context, int index, void *p)
{
index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ context->by_value[index] = 0;
context->reg[index] = p;
}
+/* Overwrite the saved value for register INDEX in CONTEXT with VAL. */
+
+static inline void
+_Unwind_SetGRValue (struct _Unwind_Context *context, int index,
+ _Unwind_Word val)
+{
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
+ gcc_assert (dwarf_reg_size_table[index] == sizeof (_Unwind_Ptr));
+
+ context->by_value[index] = 1;
+ context->reg[index] = (void *) (_Unwind_Internal_Ptr) val;
+}
+
+/* Return nonzero if register INDEX is stored by value rather than
+ by reference. */
+
+static inline int
+_Unwind_GRByValue (struct _Unwind_Context *context, int index)
+{
+ index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ return context->by_value[index];
+}
+
/* Retrieve the return address for CONTEXT. */
inline _Unwind_Ptr
return (_Unwind_Ptr) context->ra;
}
+/* Retrieve the return address and flag whether that IP is before
+ or after first not yet fully executed instruction. */
+
+inline _Unwind_Ptr
+_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
+{
+ *ip_before_insn = context->signal_frame != 0;
+ return (_Unwind_Ptr) context->ra;
+}
+
/* Overwrite the return address for CONTEXT with VAL. */
inline void
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,
/* "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);
+ _Unwind_Ptr personality;
+
+ p = read_encoded_value (context, *p, p + 1, &personality);
+ fs->personality = (_Unwind_Personality_Fn) personality;
+ aug += 1;
+ }
+
+ /* "S" indicates a signal frame. */
+ else if (aug[0] == 'S')
+ {
+ fs->signal_frame = 1;
aug += 1;
}
break;
case DW_OP_dup:
- if (stack_elt < 1)
- abort ();
+ gcc_assert (stack_elt);
result = stack[stack_elt - 1];
break;
case DW_OP_drop:
- if (--stack_elt < 0)
- abort ();
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
goto no_push;
case DW_OP_pick:
offset = *op_ptr++;
- if (offset >= stack_elt - 1)
- abort ();
+ gcc_assert (offset < stack_elt - 1);
result = stack[stack_elt - 1 - offset];
break;
case DW_OP_over:
- if (stack_elt < 2)
- abort ();
+ gcc_assert (stack_elt >= 2);
result = stack[stack_elt - 2];
break;
{
_Unwind_Word t1, t2, t3;
- if (stack_elt < 3)
- abort ();
+ gcc_assert (stack_elt >= 3);
t1 = stack[stack_elt - 1];
t2 = stack[stack_elt - 2];
t3 = stack[stack_elt - 3];
case DW_OP_not:
case DW_OP_plus_uconst:
/* Unary operations. */
- if (--stack_elt < 0)
- abort ();
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
+
result = stack[stack_elt];
switch (op)
result = read_8u (ptr);
break;
default:
- abort ();
+ gcc_unreachable ();
}
}
break;
break;
default:
- abort ();
+ gcc_unreachable ();
}
break;
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:
{
/* Binary operations. */
_Unwind_Word first, second;
- if ((stack_elt -= 2) < 0)
- abort ();
+ gcc_assert (stack_elt >= 2);
+ stack_elt -= 2;
+
second = stack[stack_elt];
first = stack[stack_elt + 1];
break;
default:
- abort ();
+ gcc_unreachable ();
}
}
break;
goto no_push;
case DW_OP_bra:
- if (--stack_elt < 0)
- abort ();
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
+
offset = read_2s (op_ptr);
op_ptr += 2;
if (stack[stack_elt] != 0)
goto no_push;
default:
- abort ();
+ gcc_unreachable ();
}
/* Most things push a result value. */
- if ((size_t) stack_elt >= sizeof(stack)/sizeof(*stack))
- abort ();
+ gcc_assert ((size_t) stack_elt < sizeof(stack)/sizeof(*stack));
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 ();
+ gcc_assert (stack_elt);
+ stack_elt -= 1;
return stack[stack_elt];
}
a different stack configuration that we are not interested in. We
assume that the call itself is unwind info-neutral; if not, or if
there are delay instructions that adjust the stack, these must be
- reflected at the point immediately before the call insn. */
- while (insn_ptr < insn_end && fs->pc < context->ra)
+ reflected at the point immediately before the call insn.
+ In signal frames, return address is after last completed instruction,
+ so we add 1 to return address to make the comparison <=. */
+ while (insn_ptr < insn_end && fs->pc < context->ra + context->signal_frame)
{
unsigned char insn = *insn_ptr++;
_Unwind_Word reg, utmp;
else switch (insn)
{
case DW_CFA_set_loc:
- insn_ptr = read_encoded_value (context, fs->fde_encoding,
- insn_ptr, (_Unwind_Ptr *) &fs->pc);
+ {
+ _Unwind_Ptr pc;
+
+ insn_ptr = read_encoded_value (context, fs->fde_encoding,
+ insn_ptr, &pc);
+ fs->pc = (void *) pc;
+ }
break;
case DW_CFA_advance_loc1:
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;
insn_ptr += utmp;
break;
- /* From the 2.1 draft. */
+ /* Dwarf3. */
case DW_CFA_offset_extended_sf:
insn_ptr = read_uleb128 (insn_ptr, ®);
insn_ptr = read_sleb128 (insn_ptr, &stmp);
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset);
fs->cfa_how = CFA_REG_OFFSET;
+ fs->cfa_offset *= fs->data_align;
break;
case DW_CFA_def_cfa_offset_sf:
insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset);
+ fs->cfa_offset *= fs->data_align;
/* cfa_how deliberately not set. */
break;
+ case DW_CFA_val_offset:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ offset = (_Unwind_Sword) utmp * fs->data_align;
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how
+ = REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = offset;
+ break;
+
+ case DW_CFA_val_offset_sf:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ offset = stmp * fs->data_align;
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how
+ = REG_SAVED_VAL_OFFSET;
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.offset = offset;
+ break;
+
+ case DW_CFA_val_expression:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how
+ = REG_SAVED_VAL_EXP;
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.exp = insn_ptr;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ insn_ptr += utmp;
+ break;
+
case DW_CFA_GNU_window_save:
/* ??? Hardcoded for SPARC register window configuration. */
for (reg = 16; reg < 32; ++reg)
break;
default:
- abort ();
+ gcc_unreachable ();
}
}
}
if (context->ra == 0)
return _URC_END_OF_STACK;
- fde = _Unwind_Find_FDE (context->ra - 1, &context->bases);
+ fde = _Unwind_Find_FDE (context->ra + context->signal_frame - 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
insn = aug + i;
}
if (fs->lsda_encoding != DW_EH_PE_omit)
- aug = read_encoded_value (context, fs->lsda_encoding, aug,
- (_Unwind_Ptr *) &context->lsda);
+ {
+ _Unwind_Ptr lsda;
+
+ aug = read_encoded_value (context, fs->lsda_encoding, aug, &lsda);
+ context->lsda = (void *) lsda;
+ }
/* Then the insns in the FDE up to our target PC. */
if (insn == NULL)
static inline void
_Unwind_SetSpColumn (struct _Unwind_Context *context, void *cfa,
- _Unwind_SpTmp *tmp_sp)
+ _Unwind_SpTmp *tmp_sp)
{
int size = dwarf_reg_size_table[__builtin_dwarf_sp_column ()];
if (size == sizeof(_Unwind_Ptr))
tmp_sp->ptr = (_Unwind_Ptr) cfa;
- else if (size == sizeof(_Unwind_Word))
- tmp_sp->word = (_Unwind_Ptr) cfa;
else
- abort ();
+ {
+ gcc_assert (size == sizeof(_Unwind_Word));
+ tmp_sp->word = (_Unwind_Ptr) cfa;
+ }
_Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), tmp_sp);
}
}
default:
- abort ();
+ gcc_unreachable ();
}
context->cfa = cfa;
break;
case REG_SAVED_REG:
- _Unwind_SetGRPtr
- (context, i,
- _Unwind_GetGRPtr (&orig_context, fs->regs.reg[i].loc.reg));
+ if (_Unwind_GRByValue (&orig_context, fs->regs.reg[i].loc.reg))
+ _Unwind_SetGRValue (context, i,
+ _Unwind_GetGR (&orig_context,
+ fs->regs.reg[i].loc.reg));
+ else
+ _Unwind_SetGRPtr (context, i,
+ _Unwind_GetGRPtr (&orig_context,
+ fs->regs.reg[i].loc.reg));
break;
case REG_SAVED_EXP:
_Unwind_SetGRPtr (context, i, (void *) val);
}
break;
+
+ case REG_SAVED_VAL_OFFSET:
+ _Unwind_SetGRValue (context, i,
+ (_Unwind_Internal_Ptr)
+ (cfa + fs->regs.reg[i].loc.offset));
+ break;
+
+ case REG_SAVED_VAL_EXP:
+ {
+ const unsigned char *exp = fs->regs.reg[i].loc.exp;
+ _Unwind_Word len;
+ _Unwind_Ptr val;
+
+ exp = read_uleb128 (exp, &len);
+ val = execute_stack_op (exp, exp + len, &orig_context,
+ (_Unwind_Ptr) cfa);
+ _Unwind_SetGRValue (context, i, val);
+ }
+ break;
}
+ context->signal_frame = fs->signal_frame;
+
+#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
context->ra = __builtin_extract_return_addr
(_Unwind_GetPtr (context, fs->retaddr_column));
}
+
+static void
+uw_advance_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
+{
+ uw_update_context (context, fs);
+}
\f
/* Fill in CONTEXT for top-of-stack. The only valid registers at this
level will be the return address and the CFA. */
void *ra = __builtin_extract_return_addr (__builtin_return_address (0));
_Unwind_FrameState fs;
_Unwind_SpTmp sp_slot;
+ _Unwind_Reason_Code code;
memset (context, 0, sizeof (struct _Unwind_Context));
context->ra = ra;
- if (uw_frame_state_for (context, &fs) != _URC_NO_REASON)
- abort ();
+ code = uw_frame_state_for (context, &fs);
+ gcc_assert (code == _URC_NO_REASON);
#if __GTHREADS
{
/* 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);
+ _Unwind_SetSpColumn (target, target->cfa, &sp_slot);
for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
{
void *c = current->reg[i];
void *t = target->reg[i];
- if (t && c && t != c)
+ gcc_assert (current->by_value[i] == 0);
+ if (target->by_value[i] && c)
+ {
+ _Unwind_Word w;
+ _Unwind_Ptr p;
+ if (dwarf_reg_size_table[i] == sizeof (_Unwind_Word))
+ {
+ w = (_Unwind_Internal_Ptr) t;
+ memcpy (c, &w, sizeof (_Unwind_Word));
+ }
+ else
+ {
+ gcc_assert (dwarf_reg_size_table[i] == sizeof (_Unwind_Ptr));
+ p = (_Unwind_Internal_Ptr) t;
+ memcpy (c, &p, sizeof (_Unwind_Ptr));
+ }
+ }
+ else if (t && c && t != c)
memcpy (c, t, dwarf_reg_size_table[i]);
}
alias (_Unwind_Backtrace);
alias (_Unwind_DeleteException);
alias (_Unwind_FindEnclosingFunction);
-alias (_Unwind_FindTableEntry);
alias (_Unwind_ForcedUnwind);
alias (_Unwind_GetDataRelBase);
alias (_Unwind_GetTextRelBase);
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