#include "tconfig.h"
#include "tsystem.h"
#include "dwarf2.h"
#include "unwind.h"
#include "unwind-pe.h"
#include "unwind-dw2-fde.h"
#include "gthr.h"
#include <string.h>
#define Dprintf if (0) printf
#ifndef __USING_SJLJ_EXCEPTIONS__
#ifndef STACK_GROWS_DOWNWARD
#define STACK_GROWS_DOWNWARD 0
#else
#undef STACK_GROWS_DOWNWARD
#define STACK_GROWS_DOWNWARD 1
#endif
#ifndef DWARF_FRAME_REGISTERS
#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
#endif
#ifndef PRE_GCC3_DWARF_FRAME_REGISTERS
#define PRE_GCC3_DWARF_FRAME_REGISTERS DWARF_FRAME_REGISTERS
#endif
struct _Unwind_Context
{
void *reg[DWARF_FRAME_REGISTERS+1];
void *cfa;
void *ra;
void *lsda;
struct dwarf_eh_bases bases;
_Unwind_Word args_size;
};
static unsigned char dwarf_reg_size_table[DWARF_FRAME_REGISTERS];
typedef struct
{
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];
struct frame_state_reg_info *prev;
} regs;
_Unwind_Sword cfa_offset;
_Unwind_Word cfa_reg;
const unsigned char *cfa_exp;
enum {
CFA_UNSET,
CFA_REG_OFFSET,
CFA_EXP,
} cfa_how;
void *pc;
_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;
union unaligned
{
void *p;
unsigned u2 __attribute__ ((mode (HI)));
unsigned u4 __attribute__ ((mode (SI)));
unsigned u8 __attribute__ ((mode (DI)));
signed s2 __attribute__ ((mode (HI)));
signed s4 __attribute__ ((mode (SI)));
signed s8 __attribute__ ((mode (DI)));
} __attribute__ ((packed));
static inline void *
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; }
static inline int
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; }
static inline int
read_2s (const void *p) { const union unaligned *up = p; return up->s2; }
static inline unsigned int
read_4u (const void *p) { const union unaligned *up = p; return up->u4; }
static inline int
read_4s (const void *p) { const union unaligned *up = p; return up->s4; }
static inline unsigned long
read_8u (const void *p) { const union unaligned *up = p; return up->u8; }
static inline unsigned long
read_8s (const void *p) { const union unaligned *up = p; return up->s8; }
inline _Unwind_Word
_Unwind_GetGR (struct _Unwind_Context *context, int index)
{
return * (_Unwind_Word *) context->reg[index];
}
inline void
_Unwind_SetGR (struct _Unwind_Context *context, int index, _Unwind_Word val)
{
Dprintf("in _Unwind_SetGR context %p index %d val %d\n", context, index, val);
Dprintf(" reg addr is %p\n", (_Unwind_Word *) context->reg[index]);
* (_Unwind_Word *) context->reg[index] = val;
}
inline _Unwind_Ptr
_Unwind_GetIP (struct _Unwind_Context *context)
{
return (_Unwind_Ptr) context->ra;
}
inline void
_Unwind_SetIP (struct _Unwind_Context *context, _Unwind_Ptr val)
{
context->ra = (void *) val;
}
void *
_Unwind_GetLanguageSpecificData (struct _Unwind_Context *context)
{
return context->lsda;
}
_Unwind_Ptr
_Unwind_GetRegionStart (struct _Unwind_Context *context)
{
return (_Unwind_Ptr) context->bases.func;
}
#ifndef __ia64__
_Unwind_Ptr
_Unwind_GetDataRelBase (struct _Unwind_Context *context)
{
return (_Unwind_Ptr) context->bases.dbase;
}
_Unwind_Ptr
_Unwind_GetTextRelBase (struct _Unwind_Context *context)
{
return (_Unwind_Ptr) context->bases.tbase;
}
#endif
static const unsigned char *
extract_cie_info (struct dwarf_cie *cie, struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
const unsigned char *aug = cie->augmentation;
const unsigned char *p = aug + strlen (aug) + 1;
const unsigned char *ret = NULL;
_Unwind_Word utmp;
if (aug[0] == 'e' && aug[1] == 'h')
{
fs->eh_ptr = read_pointer (p);
p += sizeof (void *);
aug += 2;
}
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;
if (*aug == 'z')
{
p = read_uleb128 (p, &utmp);
ret = p + utmp;
fs->saw_z = 1;
++aug;
}
while (*aug != '\0')
{
if (aug[0] == 'L')
{
fs->lsda_encoding = *p++;
aug += 1;
}
else if (aug[0] == 'R')
{
fs->fde_encoding = *p++;
aug += 1;
}
else if (aug[0] == 'P')
{
#ifdef DW2_PERSONALITY_FUNC_ENCODED_P
if (DW2_PERSONALITY_FUNC_ENCODED_P (p))
DW2_DECODE_PERSONALITY_FUNC (p, fs->personality);
else
#endif
p = read_encoded_value (context, *p, p + 1,
(_Unwind_Ptr *) &fs->personality);
aug += 1;
}
else
return ret;
}
return ret ? ret : p;
}
static _Unwind_Word
execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end,
struct _Unwind_Context *context, _Unwind_Word initial)
{
_Unwind_Word stack[64];
int stack_elt;
stack[0] = initial;
stack_elt = 1;
while (op_ptr < op_end)
{
enum dwarf_location_atom op = *op_ptr++;
_Unwind_Word result, reg, utmp;
_Unwind_Sword offset, stmp;
switch (op)
{
case DW_OP_lit0:
case DW_OP_lit1:
case DW_OP_lit2:
case DW_OP_lit3:
case DW_OP_lit4:
case DW_OP_lit5:
case DW_OP_lit6:
case DW_OP_lit7:
case DW_OP_lit8:
case DW_OP_lit9:
case DW_OP_lit10:
case DW_OP_lit11:
case DW_OP_lit12:
case DW_OP_lit13:
case DW_OP_lit14:
case DW_OP_lit15:
case DW_OP_lit16:
case DW_OP_lit17:
case DW_OP_lit18:
case DW_OP_lit19:
case DW_OP_lit20:
case DW_OP_lit21:
case DW_OP_lit22:
case DW_OP_lit23:
case DW_OP_lit24:
case DW_OP_lit25:
case DW_OP_lit26:
case DW_OP_lit27:
case DW_OP_lit28:
case DW_OP_lit29:
case DW_OP_lit30:
case DW_OP_lit31:
result = op - DW_OP_lit0;
break;
case DW_OP_addr:
result = (_Unwind_Word) (_Unwind_Ptr) read_pointer (op_ptr);
op_ptr += sizeof (void *);
break;
case DW_OP_const1u:
result = read_1u (op_ptr);
op_ptr += 1;
break;
case DW_OP_const1s:
result = read_1s (op_ptr);
op_ptr += 1;
break;
case DW_OP_const2u:
result = read_2u (op_ptr);
op_ptr += 2;
break;
case DW_OP_const2s:
result = read_2s (op_ptr);
op_ptr += 2;
break;
case DW_OP_const4u:
result = read_4u (op_ptr);
op_ptr += 4;
break;
case DW_OP_const4s:
result = read_4s (op_ptr);
op_ptr += 4;
break;
case DW_OP_const8u:
result = read_8u (op_ptr);
op_ptr += 8;
break;
case DW_OP_const8s:
result = read_8s (op_ptr);
op_ptr += 8;
break;
case DW_OP_constu:
op_ptr = read_uleb128 (op_ptr, &result);
break;
case DW_OP_consts:
op_ptr = read_sleb128 (op_ptr, &stmp);
result = stmp;
break;
case DW_OP_reg0:
case DW_OP_reg1:
case DW_OP_reg2:
case DW_OP_reg3:
case DW_OP_reg4:
case DW_OP_reg5:
case DW_OP_reg6:
case DW_OP_reg7:
case DW_OP_reg8:
case DW_OP_reg9:
case DW_OP_reg10:
case DW_OP_reg11:
case DW_OP_reg12:
case DW_OP_reg13:
case DW_OP_reg14:
case DW_OP_reg15:
case DW_OP_reg16:
case DW_OP_reg17:
case DW_OP_reg18:
case DW_OP_reg19:
case DW_OP_reg20:
case DW_OP_reg21:
case DW_OP_reg22:
case DW_OP_reg23:
case DW_OP_reg24:
case DW_OP_reg25:
case DW_OP_reg26:
case DW_OP_reg27:
case DW_OP_reg28:
case DW_OP_reg29:
case DW_OP_reg30:
case DW_OP_reg31:
result = _Unwind_GetGR (context, op - DW_OP_reg0);
break;
case DW_OP_regx:
op_ptr = read_uleb128 (op_ptr, ®);
result = _Unwind_GetGR (context, reg);
break;
case DW_OP_breg0:
case DW_OP_breg1:
case DW_OP_breg2:
case DW_OP_breg3:
case DW_OP_breg4:
case DW_OP_breg5:
case DW_OP_breg6:
case DW_OP_breg7:
case DW_OP_breg8:
case DW_OP_breg9:
case DW_OP_breg10:
case DW_OP_breg11:
case DW_OP_breg12:
case DW_OP_breg13:
case DW_OP_breg14:
case DW_OP_breg15:
case DW_OP_breg16:
case DW_OP_breg17:
case DW_OP_breg18:
case DW_OP_breg19:
case DW_OP_breg20:
case DW_OP_breg21:
case DW_OP_breg22:
case DW_OP_breg23:
case DW_OP_breg24:
case DW_OP_breg25:
case DW_OP_breg26:
case DW_OP_breg27:
case DW_OP_breg28:
case DW_OP_breg29:
case DW_OP_breg30:
case DW_OP_breg31:
op_ptr = read_sleb128 (op_ptr, &offset);
result = _Unwind_GetGR (context, op - DW_OP_breg0) + offset;
break;
case DW_OP_bregx:
op_ptr = read_uleb128 (op_ptr, ®);
op_ptr = read_sleb128 (op_ptr, &offset);
result = _Unwind_GetGR (context, reg) + offset;
break;
case DW_OP_dup:
if (stack_elt < 1)
abort ();
result = stack[stack_elt - 1];
break;
case DW_OP_drop:
if (--stack_elt < 0)
abort ();
goto no_push;
case DW_OP_pick:
offset = *op_ptr++;
if (offset >= stack_elt - 1)
abort ();
result = stack[stack_elt - 1 - offset];
break;
case DW_OP_over:
if (stack_elt < 2)
abort ();
result = stack[stack_elt - 2];
break;
case DW_OP_rot:
{
_Unwind_Word t1, t2, t3;
if (stack_elt < 3)
abort ();
t1 = stack[stack_elt - 1];
t2 = stack[stack_elt - 2];
t3 = stack[stack_elt - 3];
stack[stack_elt - 1] = t2;
stack[stack_elt - 2] = t3;
stack[stack_elt - 3] = t1;
goto no_push;
}
case DW_OP_deref:
case DW_OP_deref_size:
case DW_OP_abs:
case DW_OP_neg:
case DW_OP_not:
case DW_OP_plus_uconst:
if (--stack_elt < 0)
abort ();
result = stack[stack_elt];
switch (op)
{
case DW_OP_deref:
{
void *ptr = (void *) (_Unwind_Ptr) result;
result = (_Unwind_Ptr) read_pointer (ptr);
}
break;
case DW_OP_deref_size:
{
void *ptr = (void *) (_Unwind_Ptr) result;
switch (*op_ptr++)
{
case 1:
result = read_1u (ptr);
break;
case 2:
result = read_2u (ptr);
break;
case 4:
result = read_4u (ptr);
break;
case 8:
result = read_8u (ptr);
break;
default:
abort ();
}
}
break;
case DW_OP_abs:
if ((_Unwind_Sword) result < 0)
result = -result;
break;
case DW_OP_neg:
result = -result;
break;
case DW_OP_not:
result = ~result;
break;
case DW_OP_plus_uconst:
op_ptr = read_uleb128 (op_ptr, &utmp);
result += utmp;
break;
default:
abort ();
}
break;
case DW_OP_and:
case DW_OP_div:
case DW_OP_minus:
case DW_OP_mod:
case DW_OP_mul:
case DW_OP_or:
case DW_OP_plus:
case DW_OP_le:
case DW_OP_ge:
case DW_OP_eq:
case DW_OP_lt:
case DW_OP_gt:
case DW_OP_ne:
{
_Unwind_Word first, second;
if ((stack_elt -= 2) < 0)
abort ();
second = stack[stack_elt];
first = stack[stack_elt + 1];
switch (op)
{
case DW_OP_and:
result = second & first;
break;
case DW_OP_div:
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;
break;
case DW_OP_mul:
result = second * first;
break;
case DW_OP_or:
result = second | first;
break;
case DW_OP_plus:
result = second + first;
break;
case DW_OP_shl:
result = second << first;
break;
case DW_OP_shr:
result = second >> first;
break;
case DW_OP_shra:
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;
break;
case DW_OP_ge:
result = (_Unwind_Sword) first >= (_Unwind_Sword) second;
break;
case DW_OP_eq:
result = (_Unwind_Sword) first == (_Unwind_Sword) second;
break;
case DW_OP_lt:
result = (_Unwind_Sword) first < (_Unwind_Sword) second;
break;
case DW_OP_gt:
result = (_Unwind_Sword) first > (_Unwind_Sword) second;
break;
case DW_OP_ne:
result = (_Unwind_Sword) first != (_Unwind_Sword) second;
break;
default:
abort ();
}
}
break;
case DW_OP_skip:
offset = read_2s (op_ptr);
op_ptr += 2;
op_ptr += offset;
goto no_push;
case DW_OP_bra:
if (--stack_elt < 0)
abort ();
offset = read_2s (op_ptr);
op_ptr += 2;
if (stack[stack_elt] != 0)
op_ptr += offset;
goto no_push;
case DW_OP_nop:
goto no_push;
default:
abort ();
}
if ((size_t) stack_elt >= sizeof(stack)/sizeof(*stack))
abort ();
stack[++stack_elt] = result;
no_push:;
}
if (--stack_elt < 0)
abort ();
return stack[stack_elt];
}
static void
execute_cfa_program (const unsigned char *insn_ptr,
const unsigned char *insn_end,
struct _Unwind_Context *context,
_Unwind_FrameState *fs)
{
struct frame_state_reg_info *unused_rs = NULL;
fs->regs.prev = NULL;
while (insn_ptr < insn_end && fs->pc < context->ra)
{
unsigned char insn = *insn_ptr++;
_Unwind_Word reg, utmp;
_Unwind_Sword offset, stmp;
if ((insn & 0xc0) == DW_CFA_advance_loc)
fs->pc += (insn & 0x3f) * fs->code_align;
else if ((insn & 0xc0) == DW_CFA_offset)
{
reg = insn & 0x3f;
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;
Dprintf("execute_cfa_program reg %d REG_SAVED_OFFSET offset %d\n",
reg, offset);
}
else if ((insn & 0xc0) == DW_CFA_restore)
{
reg = insn & 0x3f;
fs->regs.reg[reg].how = REG_UNSAVED;
}
else switch (insn)
{
case DW_CFA_set_loc:
insn_ptr = read_encoded_value (context, fs->fde_encoding,
insn_ptr, (_Unwind_Ptr *) &fs->pc);
break;
case DW_CFA_advance_loc1:
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->code_align;
insn_ptr += 2;
break;
case DW_CFA_advance_loc4:
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, &utmp);
offset = (_Unwind_Sword) utmp * fs->data_align;
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
Dprintf("execute_cfa_program reg %d REG_SAVED_OFFSET offset %d\n",
reg, offset);
break;
case DW_CFA_restore_extended:
insn_ptr = read_uleb128 (insn_ptr, ®);
fs->regs.reg[reg].how = REG_UNSAVED;
break;
case DW_CFA_undefined:
case DW_CFA_same_value:
case DW_CFA_nop:
break;
case DW_CFA_register:
{
_Unwind_Word reg2;
insn_ptr = read_uleb128 (insn_ptr, ®);
insn_ptr = read_uleb128 (insn_ptr, ®2);
fs->regs.reg[reg].how = REG_SAVED_REG;
fs->regs.reg[reg].loc.reg = reg2;
}
break;
case DW_CFA_remember_state:
{
struct frame_state_reg_info *new_rs;
if (unused_rs)
{
new_rs = unused_rs;
unused_rs = unused_rs->prev;
}
else
new_rs = __builtin_alloca (sizeof (struct frame_state_reg_info));
*new_rs = fs->regs;
fs->regs.prev = new_rs;
}
break;
case DW_CFA_restore_state:
{
struct frame_state_reg_info *old_rs = fs->regs.prev;
fs->regs = *old_rs;
old_rs->prev = unused_rs;
unused_rs = old_rs;
}
break;
case DW_CFA_def_cfa:
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
insn_ptr = read_uleb128 (insn_ptr, &utmp);
fs->cfa_offset = utmp;
fs->cfa_how = CFA_REG_OFFSET;
break;
case DW_CFA_def_cfa_register:
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
fs->cfa_how = CFA_REG_OFFSET;
break;
case DW_CFA_def_cfa_offset:
insn_ptr = read_uleb128 (insn_ptr, &utmp);
fs->cfa_offset = utmp;
break;
case DW_CFA_def_cfa_expression:
insn_ptr = read_uleb128 (insn_ptr, &utmp);
fs->cfa_exp = insn_ptr;
fs->cfa_how = CFA_EXP;
insn_ptr += utmp;
break;
case DW_CFA_expression:
insn_ptr = read_uleb128 (insn_ptr, ®);
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 += utmp;
break;
case DW_CFA_offset_extended_sf:
insn_ptr = read_uleb128 (insn_ptr, ®);
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;
Dprintf("execute_cfa_program reg %d REG_SAVED_OFFSET offset %d\n",
reg, offset);
break;
case DW_CFA_def_cfa_sf:
insn_ptr = read_uleb128 (insn_ptr, &fs->cfa_reg);
insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset);
fs->cfa_how = CFA_REG_OFFSET;
break;
case DW_CFA_def_cfa_offset_sf:
insn_ptr = read_sleb128 (insn_ptr, &fs->cfa_offset);
break;
case DW_CFA_GNU_window_save:
for (reg = 16; reg < 32; ++reg)
{
fs->regs.reg[reg].how = REG_SAVED_OFFSET;
fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *);
}
break;
case DW_CFA_GNU_args_size:
insn_ptr = read_uleb128 (insn_ptr, &context->args_size);
break;
case DW_CFA_GNU_negative_offset_extended:
insn_ptr = read_uleb128 (insn_ptr, ®);
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;
Dprintf("execute_cfa_program reg %d REG_SAVED_OFFSET offset %d\n",
reg, fs->regs.reg[reg].loc.offset);
break;
default:
abort ();
}
}
}
static _Unwind_Reason_Code
uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
struct dwarf_fde *fde;
struct dwarf_cie *cie;
const unsigned char *aug, *insn, *end;
Dprintf("in uw_frame_state_for\n");
memset (fs, 0, sizeof (*fs));
context->args_size = 0;
context->lsda = 0;
fde = _Unwind_Find_FDE (context->ra - 1, &context->bases);
Dprintf("found fde = %p\n", fde);
if (fde == NULL)
{
#ifdef MD_FALLBACK_FRAME_STATE_FOR
MD_FALLBACK_FRAME_STATE_FOR (context, fs, success);
return _URC_END_OF_STACK;
success:
return _URC_NO_REASON;
#else
return _URC_END_OF_STACK;
#endif
}
fs->pc = context->bases.func;
Dprintf("to get cie\n");
cie = get_cie (fde);
insn = extract_cie_info (cie, context, fs);
if (insn == NULL)
return _URC_FATAL_PHASE1_ERROR;
Dprintf("got cie\n");
end = (unsigned char *) next_fde ((struct dwarf_fde *) cie);
execute_cfa_program (insn, end, context, fs);
aug = (unsigned char *) fde + sizeof (*fde);
aug += 2 * size_of_encoded_value (fs->fde_encoding);
insn = NULL;
if (fs->saw_z)
{
_Unwind_Word i;
aug = read_uleb128 (aug, &i);
insn = aug + i;
}
if (fs->lsda_encoding != DW_EH_PE_omit)
aug = read_encoded_value (context, fs->lsda_encoding, aug,
(_Unwind_Ptr *) &context->lsda);
if (insn == NULL)
insn = aug;
end = (unsigned char *) next_fde (fde);
execute_cfa_program (insn, end, context, fs);
return _URC_NO_REASON;
}
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 *);
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;
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;
}
static void
uw_update_context_1 (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
struct _Unwind_Context orig_context = *context;
void *cfa;
long i;
Dprintf("uw_update_context_1 context %p\n", context);
switch (fs->cfa_how)
{
case CFA_REG_OFFSET:
if (context->reg[fs->cfa_reg] == NULL)
cfa = context->cfa;
else
cfa = (void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->cfa_reg);
cfa += fs->cfa_offset;
break;
case CFA_EXP:
{
const unsigned char *exp = fs->cfa_exp;
_Unwind_Word len;
exp = read_uleb128 (exp, &len);
cfa = (void *) (_Unwind_Ptr)
execute_stack_op (exp, exp + len, context, 0);
break;
}
default:
abort ();
}
context->cfa = cfa;
for (i = 0; i < DWARF_FRAME_REGISTERS + 1; ++i)
switch (fs->regs.reg[i].how)
{
case REG_UNSAVED:
break;
case REG_SAVED_OFFSET:
context->reg[i] = cfa + fs->regs.reg[i].loc.offset;
Dprintf("REG_SAVED_OFFSET context %p reg %ld is at %p\n", context, i, context->reg[i]);
break;
case REG_SAVED_REG:
context->reg[i] = orig_context.reg[fs->regs.reg[i].loc.reg];
Dprintf("REG_SAVED_REG context %p reg %ld is at %p\n", context, i, context->reg[i]);
break;
case REG_SAVED_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);
context->reg[i] = (void *) val;
Dprintf("REG_SAVED_EXP context %p reg %ld is at %p\n", context, i, context->reg[i]);
}
break;
}
}
static void
uw_update_context (struct _Unwind_Context *context, _Unwind_FrameState *fs)
{
uw_update_context_1 (context, fs);
context->ra = __builtin_extract_return_addr
((void *) (_Unwind_Ptr) _Unwind_GetGR (context, fs->retaddr_column));
}
#define uw_init_context(CONTEXT) \
do \
{ \
\
__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,
void *outer_cfa, void *outer_ra)
{
void *ra = __builtin_extract_return_addr (__builtin_return_address (0));
_Unwind_FrameState fs;
Dprintf("begin uw_init_context_1 %p\n", context);
memset (context, 0, sizeof (struct _Unwind_Context));
context->ra = ra;
if (uw_frame_state_for (context, &fs) != _URC_NO_REASON)
abort ();
Dprintf("middle uw_init_context_1 %p\n", context);
context->cfa = outer_cfa;
fs.cfa_how = CFA_REG_OFFSET;
fs.cfa_reg = 0;
fs.cfa_offset = 0;
uw_update_context_1 (context, &fs);
context->ra = __builtin_extract_return_addr (outer_ra);
}
#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)
{
__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
Dprintf("in uw_install_context_1\n");
for (i = 0; i < DWARF_FRAME_REGISTERS; ++i)
{
void *c = current->reg[i];
void *t = target->reg[i];
if (t && c && t != c)
Dprintf("Installing reg %ld, %x over %x\n",
i, *((int *)t), *((int *)c));
if (t && c && t != c)
memcpy (c, t, dwarf_reg_size_table[i]);
}
if (STACK_GROWS_DOWNWARD)
return target->cfa - current->cfa + target->args_size;
else
return current->cfa - target->cfa - target->args_size;
}
static inline _Unwind_Ptr
uw_identify_context (struct _Unwind_Context *context)
{
return _Unwind_GetIP (context);
}
#include "unwind.inc"
#endif