/* DWARF2 exception handling and frame unwind runtime interface routines.
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
- Free Software Foundation, Inc.
+ Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+ 2008, 2009 Free Software Foundation, Inc.
This file is part of GCC.
void *ra;
void *lsda;
struct dwarf_eh_bases bases;
+ /* Signal frame context. */
+#define SIGNAL_FRAME_BIT ((~(_Unwind_Word) 0 >> 1) + 1)
+ /* Context which has version/args_size/by_value fields. */
+#define EXTENDED_CONTEXT_BIT ((~(_Unwind_Word) 0 >> 2) + 1)
+ _Unwind_Word flags;
+ /* 0 for now, can be increased when further fields are added to
+ struct _Unwind_Context. */
+ _Unwind_Word version;
_Unwind_Word args_size;
- char signal_frame;
char by_value[DWARF_FRAME_REGISTERS+1];
};
static inline unsigned long
read_8s (const void *p) { const union unaligned *up = p; return up->s8; }
\f
+static inline _Unwind_Word
+_Unwind_IsSignalFrame (struct _Unwind_Context *context)
+{
+ return (context->flags & SIGNAL_FRAME_BIT) ? 1 : 0;
+}
+
+static inline void
+_Unwind_SetSignalFrame (struct _Unwind_Context *context, int val)
+{
+ if (val)
+ context->flags |= SIGNAL_FRAME_BIT;
+ else
+ context->flags &= ~SIGNAL_FRAME_BIT;
+}
+
+static inline _Unwind_Word
+_Unwind_IsExtendedContext (struct _Unwind_Context *context)
+{
+ return context->flags & EXTENDED_CONTEXT_BIT;
+}
+\f
/* Get the value of register INDEX as saved in CONTEXT. */
inline _Unwind_Word
size = dwarf_reg_size_table[index];
ptr = context->reg[index];
- if (context->by_value[index])
+ if (_Unwind_IsExtendedContext (context) && context->by_value[index])
return (_Unwind_Word) (_Unwind_Internal_Ptr) ptr;
/* This will segfault if the register hasn't been saved. */
gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
size = dwarf_reg_size_table[index];
- if (context->by_value[index])
+ if (_Unwind_IsExtendedContext (context) && context->by_value[index])
{
context->reg[index] = (void *) (_Unwind_Internal_Ptr) val;
return;
_Unwind_GetGRPtr (struct _Unwind_Context *context, int index)
{
index = DWARF_REG_TO_UNWIND_COLUMN (index);
- if (context->by_value[index])
+ if (_Unwind_IsExtendedContext (context) && 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;
+ if (_Unwind_IsExtendedContext (context))
+ context->by_value[index] = 0;
context->reg[index] = p;
}
inline _Unwind_Ptr
_Unwind_GetIPInfo (struct _Unwind_Context *context, int *ip_before_insn)
{
- *ip_before_insn = context->signal_frame != 0;
+ *ip_before_insn = _Unwind_IsSignalFrame (context);
return (_Unwind_Ptr) context->ra;
}
const unsigned char *aug = cie->augmentation;
const unsigned char *p = aug + strlen ((const char *)aug) + 1;
const unsigned char *ret = NULL;
- _Unwind_Word utmp;
+ _uleb128_t utmp;
+ _sleb128_t stmp;
/* g++ v2 "eh" has pointer immediately following augmentation string,
so it must be handled first. */
/* Immediately following the augmentation are the code and
data alignment and return address column. */
- p = read_uleb128 (p, &fs->code_align);
- p = read_sleb128 (p, &fs->data_align);
+ p = read_uleb128 (p, &utmp);
+ fs->code_align = (_Unwind_Word)utmp;
+ p = read_sleb128 (p, &stmp);
+ fs->data_align = (_Unwind_Sword)stmp;
if (cie->version == 1)
fs->retaddr_column = *p++;
else
- p = read_uleb128 (p, &fs->retaddr_column);
+ {
+ p = read_uleb128 (p, &utmp);
+ fs->retaddr_column = (_Unwind_Word)utmp;
+ }
fs->lsda_encoding = DW_EH_PE_omit;
/* If the augmentation starts with 'z', then a uleb128 immediately
while (op_ptr < op_end)
{
enum dwarf_location_atom op = *op_ptr++;
- _Unwind_Word result, reg, utmp;
- _Unwind_Sword offset, stmp;
+ _Unwind_Word result;
+ _uleb128_t reg, utmp;
+ _sleb128_t offset, stmp;
switch (op)
{
op_ptr += sizeof (void *);
break;
+ case DW_OP_GNU_encoded_addr:
+ {
+ _Unwind_Ptr presult;
+ op_ptr = read_encoded_value (context, *op_ptr, op_ptr+1, &presult);
+ result = presult;
+ }
+ break;
+
case DW_OP_const1u:
result = read_1u (op_ptr);
op_ptr += 1;
op_ptr += 8;
break;
case DW_OP_constu:
- op_ptr = read_uleb128 (op_ptr, &result);
+ op_ptr = read_uleb128 (op_ptr, &utmp);
+ result = (_Unwind_Word)utmp;
break;
case DW_OP_consts:
op_ptr = read_sleb128 (op_ptr, &stmp);
- result = stmp;
+ result = (_Unwind_Sword)stmp;
break;
case DW_OP_reg0:
case DW_OP_bregx:
op_ptr = read_uleb128 (op_ptr, ®);
op_ptr = read_sleb128 (op_ptr, &offset);
- result = _Unwind_GetGR (context, reg) + offset;
+ result = _Unwind_GetGR (context, reg) + (_Unwind_Word)offset;
break;
case DW_OP_dup:
result = stack[stack_elt - 2];
break;
+ case DW_OP_swap:
+ {
+ _Unwind_Word t;
+ gcc_assert (stack_elt >= 2);
+ t = stack[stack_elt - 1];
+ stack[stack_elt - 1] = stack[stack_elt - 2];
+ stack[stack_elt - 2] = t;
+ goto no_push;
+ }
+
case DW_OP_rot:
{
_Unwind_Word t1, t2, t3;
break;
case DW_OP_plus_uconst:
op_ptr = read_uleb128 (op_ptr, &utmp);
- result += utmp;
+ result += (_Unwind_Word)utmp;
break;
default:
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)
+ while (insn_ptr < insn_end
+ && fs->pc < context->ra + _Unwind_IsSignalFrame (context))
{
unsigned char insn = *insn_ptr++;
- _Unwind_Word reg, utmp;
- _Unwind_Sword offset, stmp;
+ _uleb128_t reg, utmp;
+ _sleb128_t offset, stmp;
if ((insn & 0xc0) == DW_CFA_advance_loc)
fs->pc += (insn & 0x3f) * fs->code_align;
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_undefined:
+ insn_ptr = read_uleb128 (insn_ptr, ®);
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN(reg)].how = REG_UNDEFINED;
+ break;
+
case DW_CFA_nop:
break;
case DW_CFA_register:
{
- _Unwind_Word reg2;
+ _uleb128_t reg2;
insn_ptr = read_uleb128 (insn_ptr, ®);
insn_ptr = read_uleb128 (insn_ptr, ®2);
fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].how = REG_SAVED_REG;
- fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.reg = reg2;
+ fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (reg)].loc.reg =
+ (_Unwind_Word)reg2;
}
break;
break;
case DW_CFA_def_cfa:
- insn_ptr = read_uleb128 (insn_ptr, &fs->regs.cfa_reg);
insn_ptr = read_uleb128 (insn_ptr, &utmp);
- fs->regs.cfa_offset = utmp;
+ fs->regs.cfa_reg = (_Unwind_Word)utmp;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->regs.cfa_offset = (_Unwind_Word)utmp;
fs->regs.cfa_how = CFA_REG_OFFSET;
break;
case DW_CFA_def_cfa_register:
- insn_ptr = read_uleb128 (insn_ptr, &fs->regs.cfa_reg);
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->regs.cfa_reg = (_Unwind_Word)utmp;
fs->regs.cfa_how = CFA_REG_OFFSET;
break;
break;
case DW_CFA_def_cfa_sf:
- insn_ptr = read_uleb128 (insn_ptr, &fs->regs.cfa_reg);
- insn_ptr = read_sleb128 (insn_ptr, &fs->regs.cfa_offset);
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->regs.cfa_reg = (_Unwind_Word)utmp;
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ fs->regs.cfa_offset = (_Unwind_Sword)stmp;
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_offset *= fs->data_align;
break;
case DW_CFA_def_cfa_offset_sf:
- insn_ptr = read_sleb128 (insn_ptr, &fs->regs.cfa_offset);
+ insn_ptr = read_sleb128 (insn_ptr, &stmp);
+ fs->regs.cfa_offset = (_Unwind_Sword)stmp;
fs->regs.cfa_offset *= fs->data_align;
/* cfa_how deliberately not set. */
break;
break;
case DW_CFA_GNU_args_size:
- insn_ptr = read_uleb128 (insn_ptr, &context->args_size);
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ context->args_size = (_Unwind_Word)utmp;
break;
case DW_CFA_GNU_negative_offset_extended:
if (context->ra == 0)
return _URC_END_OF_STACK;
- fde = _Unwind_Find_FDE (context->ra + context->signal_frame - 1,
+ fde = _Unwind_Find_FDE (context->ra + _Unwind_IsSignalFrame (context) - 1,
&context->bases);
if (fde == NULL)
{
return _URC_FATAL_PHASE1_ERROR;
/* First decode all the insns in the CIE. */
- end = (unsigned char *) next_fde ((struct dwarf_fde *) cie);
+ end = (const unsigned char *) next_fde ((const struct dwarf_fde *) cie);
execute_cfa_program (insn, end, context, fs);
/* Locate augmentation for the fde. */
- aug = (unsigned char *) fde + sizeof (*fde);
+ aug = (const unsigned char *) fde + sizeof (*fde);
aug += 2 * size_of_encoded_value (fs->fde_encoding);
insn = NULL;
if (fs->saw_z)
{
- _Unwind_Word i;
+ _uleb128_t i;
aug = read_uleb128 (aug, &i);
insn = aug + i;
}
/* Then the insns in the FDE up to our target PC. */
if (insn == NULL)
insn = aug;
- end = (unsigned char *) next_fde (fde);
+ end = (const unsigned char *) next_fde (fde);
execute_cfa_program (insn, end, context, fs);
return _URC_NO_REASON;
int reg;
memset (&context, 0, sizeof (struct _Unwind_Context));
+ context.flags = EXTENDED_CONTEXT_BIT;
context.ra = pc_target + 1;
if (uw_frame_state_for (&context, &fs) != _URC_NO_REASON)
case CFA_EXP:
{
const unsigned char *exp = fs->regs.cfa_exp;
- _Unwind_Word len;
+ _uleb128_t len;
exp = read_uleb128 (exp, &len);
cfa = (void *) (_Unwind_Ptr)
switch (fs->regs.reg[i].how)
{
case REG_UNSAVED:
+ case REG_UNDEFINED:
break;
case REG_SAVED_OFFSET:
case REG_SAVED_EXP:
{
const unsigned char *exp = fs->regs.reg[i].loc.exp;
- _Unwind_Word len;
+ _uleb128_t len;
_Unwind_Ptr val;
exp = read_uleb128 (exp, &len);
case REG_SAVED_VAL_EXP:
{
const unsigned char *exp = fs->regs.reg[i].loc.exp;
- _Unwind_Word len;
+ _uleb128_t len;
_Unwind_Ptr val;
exp = read_uleb128 (exp, &len);
break;
}
- context->signal_frame = fs->signal_frame;
+ _Unwind_SetSignalFrame (context, fs->signal_frame);
#ifdef MD_FROB_UPDATE_CONTEXT
MD_FROB_UPDATE_CONTEXT (context, 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
- (_Unwind_GetPtr (context, fs->retaddr_column));
+ /* In general this unwinder doesn't make any distinction between
+ undefined and same_value rule. Call-saved registers are assumed
+ to have same_value rule by default and explicit undefined
+ rule is handled like same_value. The only exception is
+ DW_CFA_undefined on retaddr_column which is supposed to
+ mark outermost frame in DWARF 3. */
+ if (fs->regs.reg[DWARF_REG_TO_UNWIND_COLUMN (fs->retaddr_column)].how
+ == REG_UNDEFINED)
+ /* uw_frame_state_for uses context->ra == 0 check to find outermost
+ stack frame. */
+ context->ra = 0;
+ else
+ /* Compute the return address now, since the return address column
+ can change from frame to frame. */
+ context->ra = __builtin_extract_return_addr
+ (_Unwind_GetPtr (context, fs->retaddr_column));
}
static void
memset (context, 0, sizeof (struct _Unwind_Context));
context->ra = ra;
+ context->flags = EXTENDED_CONTEXT_BIT;
code = uw_frame_state_for (context, &fs);
gcc_assert (code == _URC_NO_REASON);
{
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)
+ && dwarf_reg_size_table[0] == 0)
init_dwarf_reg_size_table ();
}
#else
static inline _Unwind_Ptr
uw_identify_context (struct _Unwind_Context *context)
{
- return _Unwind_GetIP (context);
+ return _Unwind_GetCFA (context);
}
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