the Free Software Foundation; either version 2, or (at your option)
any later version.
+ In addition to the permissions in the GNU General Public License, the
+ Free Software Foundation gives you unlimited permission to link the
+ compiled version of this file into combinations with other programs,
+ and to distribute those combinations without any restriction coming
+ from the use of this file. (The General Public License restrictions
+ do apply in other respects; for example, they cover modification of
+ the file, and distribution when not linked into a combined
+ executable.)
+
GCC 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
#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. */
};
/* Byte size of every register managed by these routines. */
-static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS];
+static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS+1];
\f
/* The result of interpreting the frame unwind info for a frame.
inline _Unwind_Word
_Unwind_GetGR (struct _Unwind_Context *context, int index)
{
+ int size;
+ void *ptr;
+
index = DWARF_REG_TO_UNWIND_COLUMN (index);
+ if (index >= sizeof(dwarf_reg_size_table))
+ abort ();
+ size = dwarf_reg_size_table[index];
+ ptr = context->reg[index];
+
/* This will segfault if the register hasn't been saved. */
- return * (_Unwind_Word *) context->reg[index];
+ if (size == sizeof(_Unwind_Ptr))
+ return * (_Unwind_Ptr *) ptr;
+
+ if (size == sizeof(_Unwind_Word))
+ return * (_Unwind_Word *) ptr;
+
+ abort ();
+}
+
+static inline void *
+_Unwind_GetPtr (struct _Unwind_Context *context, int index)
+{
+ return (void *)(_Unwind_Ptr) _Unwind_GetGR (context, index);
}
/* Get the value of the CFA as saved in CONTEXT. */
inline void
_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
{
+ int size;
+ void *ptr;
+
index = DWARF_REG_TO_UNWIND_COLUMN (index);
- * (_Unwind_Word *) context->reg[index] = val;
+ if (index >= sizeof(dwarf_reg_size_table))
+ abort ();
+ size = dwarf_reg_size_table[index];
+ 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 ();
}
/* Get the pointer to a register INDEX as saved in CONTEXT. */
context->args_size = 0;
context->lsda = 0;
+ if (context->ra == 0)
+ return _URC_END_OF_STACK;
+
fde = _Unwind_Find_FDE (context->ra - 1, &context->bases);
if (fde == NULL)
{
return state_in;
}
\f
+typedef union { _Unwind_Ptr ptr; _Unwind_Word word; } _Unwind_SpTmp;
+
+static inline void
+_Unwind_SetSpColumn (struct _Unwind_Context *context, void *cfa,
+ _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 ();
+ _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), tmp_sp);
+}
+
static void
uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
Always zap the saved stack pointer value for the next frame; carrying
the value over from one frame to another doesn't make sense. */
- _Unwind_Word tmp_sp;
+ _Unwind_SpTmp tmp_sp;
if (!_Unwind_GetGRPtr (&orig_context, __builtin_dwarf_sp_column ()))
- {
- tmp_sp = (_Unwind_Ptr) context->cfa;
- _Unwind_SetGRPtr (&orig_context, __builtin_dwarf_sp_column (), &tmp_sp);
- }
+ _Unwind_SetSpColumn (&orig_context, context->cfa, &tmp_sp);
_Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), NULL);
#endif
switch (fs->cfa_how)
{
case CFA_REG_OFFSET:
- cfa = (void *) (_Unwind_Ptr) _Unwind_GetGR (&orig_context, fs->cfa_reg);
+ cfa = _Unwind_GetPtr (&orig_context, fs->cfa_reg);
cfa += fs->cfa_offset;
break;
}
break;
}
+
+ MD_FROB_UPDATE_CONTEXT (context, fs);
}
/* CONTEXT describes the unwind state for a frame, and FS describes the FDE
/* 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));
+ (_Unwind_GetPtr (context, fs->retaddr_column));
}
\f
/* Fill in CONTEXT for top-of-stack. The only valid registers at this
} \
while (0)
+static inline void
+init_dwarf_reg_size_table (void)
+{
+ __builtin_init_dwarf_reg_size_table (dwarf_reg_size_table);
+}
+
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;
+ _Unwind_SpTmp sp_slot;
memset (context, 0, sizeof (struct _Unwind_Context));
context->ra = ra;
if (uw_frame_state_for (context, &fs) != _URC_NO_REASON)
abort ();
+#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
+
/* Force the frame state to use the known cfa value. */
- _Unwind_SetGRPtr (context, __builtin_dwarf_sp_column (), &outer_cfa);
+ _Unwind_SetSpColumn (context, outer_cfa, &sp_slot);
fs.cfa_how = CFA_REG_OFFSET;
fs.cfa_reg = __builtin_dwarf_sp_column ();
fs.cfa_offset = 0;
} \
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];
/* If the last frame records a saved stack pointer, use it. */
if (_Unwind_GetGRPtr (target, __builtin_dwarf_sp_column ()))
- target_cfa = (void *)(_Unwind_Ptr)
- _Unwind_GetGR (target, __builtin_dwarf_sp_column ());
+ target_cfa = _Unwind_GetPtr (target, __builtin_dwarf_sp_column ());
else
target_cfa = target->cfa;
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