/* DWARF2 exception handling and frame unwind runtime interface routines.
- Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
+ Free Software Foundation, Inc.
- This file is part of GNU CC.
+ This file is part of GCC.
- 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
+ GCC 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.
+ 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
+ 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. */
+ 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. */
#include "tconfig.h"
#include "tsystem.h"
#include "gthr.h"
-#if !USING_SJLJ_EXCEPTIONS
+#ifndef __USING_SJLJ_EXCEPTIONS__
#ifndef STACK_GROWS_DOWNWARD
#define STACK_GROWS_DOWNWARD 0
#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
+#endif
+
/* This is the register and unwind state for a particular frame. */
struct _Unwind_Context
{
{
struct {
union {
- unsigned int reg;
+ _Unwind_Word reg;
_Unwind_Sword offset;
const unsigned char *exp;
} loc;
/* The information we care about from the CIE/FDE. */
_Unwind_Personality_Fn personality;
- signed int data_align;
- unsigned int code_align;
+ _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. */
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; }
+read_1u (const void *p) { return *(const unsigned char *) p; }
static inline int
-read_1s (const void *p) { return *(const signed char *)p; }
+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; }
const unsigned char *aug = cie->augmentation;
const unsigned char *p = aug + strlen (aug) + 1;
const unsigned char *ret = NULL;
- _Unwind_Word code_align;
- _Unwind_Sword data_align;
+ _Unwind_Word utmp;
+
+ /* 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, &code_align);
- p = read_sleb128 (p, &data_align);
- fs->code_align = code_align;
- fs->data_align = data_align;
+ p = read_uleb128 (p, &fs->code_align);
+ p = read_sleb128 (p, &fs->data_align);
fs->retaddr_column = *p++;
fs->lsda_encoding = DW_EH_PE_omit;
the size. */
if (*aug == 'z')
{
- _Unwind_Word i;
- p = read_uleb128 (p, &i);
- ret = p + i;
+ p = read_uleb128 (p, &utmp);
+ ret = p + utmp;
fs->saw_z = 1;
++aug;
/* Iterate over recognized augmentation subsequences. */
while (*aug != '\0')
{
- /* "eh" was used by g++ v2; recognize and skip. */
- if (aug[0] == 'e' && aug[1] == 'h')
- {
- p += sizeof (void *);
- aug += 2;
- }
-
/* "L" indicates a byte showing how the LSDA pointer is encoded. */
- else if (aug[0] == 'L')
+ if (aug[0] == 'L')
{
fs->lsda_encoding = *p++;
aug += 1;
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. */
+ _Unwind_Word stack[64]; /* ??? Assume this is enough. */
int stack_elt;
stack[0] = initial;
while (op_ptr < op_end)
{
enum dwarf_location_atom op = *op_ptr++;
- _Unwind_Word result, reg;
- _Unwind_Sword offset;
+ _Unwind_Word result, reg, utmp;
+ _Unwind_Sword offset, stmp;
switch (op)
{
op_ptr = read_uleb128 (op_ptr, &result);
break;
case DW_OP_consts:
- op_ptr = read_sleb128 (op_ptr, &offset);
- result = offset;
+ op_ptr = read_sleb128 (op_ptr, &stmp);
+ result = stmp;
break;
case DW_OP_reg0:
{
case DW_OP_deref:
{
- void *ptr = (void *)(_Unwind_Ptr) result;
+ void *ptr = (void *) (_Unwind_Ptr) result;
result = (_Unwind_Ptr) read_pointer (ptr);
}
break;
case DW_OP_deref_size:
{
- void *ptr = (void *)(_Unwind_Ptr) result;
+ void *ptr = (void *) (_Unwind_Ptr) result;
switch (*op_ptr++)
{
case 1:
result = ~result;
break;
case DW_OP_plus_uconst:
- op_ptr = read_uleb128 (op_ptr, ®);
- result += reg;
+ op_ptr = read_uleb128 (op_ptr, &utmp);
+ result += utmp;
break;
+
+ default:
+ abort ();
}
break;
result = second & first;
break;
case DW_OP_div:
- result = (_Unwind_Sword)second / (_Unwind_Sword)first;
+ 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;
+ result = (_Unwind_Sword) second % (_Unwind_Sword) first;
break;
case DW_OP_mul:
result = second * first;
result = second >> first;
break;
case DW_OP_shra:
- result = (_Unwind_Sword)second >> first;
+ 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;
+ result = (_Unwind_Sword) first <= (_Unwind_Sword) second;
break;
case DW_OP_ge:
- result = (_Unwind_Sword)first >= (_Unwind_Sword)second;
+ result = (_Unwind_Sword) first >= (_Unwind_Sword) second;
break;
case DW_OP_eq:
- result = (_Unwind_Sword)first == (_Unwind_Sword)second;
+ result = (_Unwind_Sword) first == (_Unwind_Sword) second;
break;
case DW_OP_lt:
- result = (_Unwind_Sword)first < (_Unwind_Sword)second;
+ result = (_Unwind_Sword) first < (_Unwind_Sword) second;
break;
case DW_OP_gt:
- result = (_Unwind_Sword)first > (_Unwind_Sword)second;
+ result = (_Unwind_Sword) first > (_Unwind_Sword) second;
break;
case DW_OP_ne:
- result = (_Unwind_Sword)first != (_Unwind_Sword)second;
+ result = (_Unwind_Sword) first != (_Unwind_Sword) second;
break;
+
+ default:
+ abort ();
}
}
break;
/* Don't allow remember/restore between CIE and FDE programs. */
fs->regs.prev = NULL;
+ /* The comparison with the return address uses < rather than <= because
+ we are only interested in the effects of code before the call; for a
+ noreturn function, the return address may point to unrelated code with
+ 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)
{
unsigned char insn = *insn_ptr++;
- _Unwind_Word reg, uoffset;
- _Unwind_Sword offset;
+ _Unwind_Word reg, utmp;
+ _Unwind_Sword offset, stmp;
- if (insn & DW_CFA_advance_loc)
+ if ((insn & 0xc0) == DW_CFA_advance_loc)
fs->pc += (insn & 0x3f) * fs->code_align;
- else if (insn & DW_CFA_offset)
+ else if ((insn & 0xc0) == DW_CFA_offset)
{
reg = insn & 0x3f;
- insn_ptr = read_uleb128 (insn_ptr, &uoffset);
- offset = (_Unwind_Sword)uoffset * fs->data_align;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ offset = (_Unwind_Sword) utmp * fs->data_align;
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
}
- else if (insn & DW_CFA_restore)
+ else if ((insn & 0xc0) == DW_CFA_restore)
{
reg = insn & 0x3f;
fs->regs.reg[reg].how = REG_UNSAVED;
break;
case DW_CFA_advance_loc1:
- fs->pc += read_1u (insn_ptr);
+ 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->pc += read_2u (insn_ptr) * fs->code_align;
insn_ptr += 2;
break;
case DW_CFA_advance_loc4:
- fs->pc += read_4u (insn_ptr);
+ fs->pc += read_4u (insn_ptr) * fs->code_align;
insn_ptr += 4;
break;
case DW_CFA_offset_extended:
insn_ptr = read_uleb128 (insn_ptr, ®);
- insn_ptr = read_uleb128 (insn_ptr, &uoffset);
- offset = (_Unwind_Sword)uoffset * fs->data_align;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ offset = (_Unwind_Sword) utmp * fs->data_align;
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
break;
unused_rs = unused_rs->prev;
}
else
- new_rs = alloca (sizeof (struct frame_state_reg_info));
+ new_rs = __builtin_alloca (sizeof (struct frame_state_reg_info));
*new_rs = fs->regs;
fs->regs.prev = new_rs;
case DW_CFA_def_cfa:
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
- insn_ptr = read_uleb128 (insn_ptr, &uoffset);
- fs->cfa_offset = uoffset;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->cfa_offset = utmp;
fs->cfa_how = CFA_REG_OFFSET;
break;
break;
case DW_CFA_def_cfa_offset:
- insn_ptr = read_uleb128 (insn_ptr, &uoffset);
- fs->cfa_offset = uoffset;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->cfa_offset = utmp;
/* cfa_how deliberately not set. */
break;
case DW_CFA_def_cfa_expression:
- insn_ptr = read_uleb128 (insn_ptr, &uoffset);
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
fs->cfa_exp = insn_ptr;
fs->cfa_how = CFA_EXP;
- insn_ptr += uoffset;
+ insn_ptr += utmp;
break;
case DW_CFA_expression:
insn_ptr = read_uleb128 (insn_ptr, ®);
- insn_ptr = read_uleb128 (insn_ptr, &uoffset);
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
fs->regs.reg[reg].how = REG_SAVED_EXP;
fs->regs.reg[reg].loc.exp = insn_ptr;
- insn_ptr += uoffset;
+ insn_ptr += utmp;
break;
/* From the 2.1 draft. */
case DW_CFA_offset_extended_sf:
insn_ptr = read_uleb128 (insn_ptr, ®);
- insn_ptr = read_sleb128 (insn_ptr, &offset);
- offset *= fs->data_align;
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ offset = stmp * fs->data_align;
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
break;
break;
case DW_CFA_def_cfa_offset_sf:
- insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_offset);
+ insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset);
/* cfa_how deliberately not set. */
break;
/* Obsoleted by DW_CFA_offset_extended_sf, but used by
older PowerPC code. */
insn_ptr = read_uleb128 (insn_ptr, ®);
- insn_ptr = read_uleb128 (insn_ptr, &uoffset);
- offset = (_Unwind_Sword)uoffset * fs->data_align;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ offset = (_Unwind_Word) utmp * fs->data_align;
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = -offset;
break;
{
/* 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. */
+ 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;
execute_cfa_program (insn, end, context, fs);
/* Locate augmentation for the fde. */
- aug = (unsigned char *)fde + sizeof (*fde);
+ aug = (unsigned char *) fde + sizeof (*fde);
aug += 2 * size_of_encoded_value (fs->fde_encoding);
insn = NULL;
if (fs->saw_z)
return _URC_NO_REASON;
}
+\f
+typedef struct frame_state
+{
+ void *cfa;
+ void *eh_ptr;
+ long cfa_offset;
+ long args_size;
+ long reg_or_offset[PRE_GCC3_DWARF_FRAME_REGISTERS+1];
+ unsigned short cfa_reg;
+ unsigned short retaddr_column;
+ char saved[PRE_GCC3_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 < PRE_GCC3_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;
+}
+\f
static void
uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
/* 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)
+#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,
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)
+#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)
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