/* 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, 2010 Free Software Foundation, Inc.
This file is part of GCC.
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)
+ the Free Software Foundation; either version 3, 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
License for more details.
- 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, 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
+ Under Section 7 of GPL version 3, you are granted additional
+ permissions described in the GCC Runtime Library Exception, version
+ 3.1, as published by the Free Software Foundation.
+
+ You should have received a copy of the GNU General Public License and
+ a copy of the GCC Runtime Library Exception along with this program;
+ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+ <http://www.gnu.org/licenses/>. */
#include "tconfig.h"
#include "tsystem.h"
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. */
aug += 2;
}
- /* Immediately following the augmentation are the code and
+ /* After the augmentation resp. pointer for "eh" augmentation
+ follows for CIE version >= 4 address size byte and
+ segment size byte. */
+ if (__builtin_expect (cie->version >= 4, 0))
+ {
+ if (p[0] != sizeof (void *) || p[1] != 0)
+ return NULL;
+ p += 2;
+ }
+ /* Immediately following this 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
else if (aug[0] == 'P')
{
_Unwind_Ptr personality;
-
+
p = read_encoded_value (context, *p, p + 1, &personality);
fs->personality = (_Unwind_Personality_Fn) personality;
aug += 1;
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;
/* Unary operations. */
gcc_assert (stack_elt);
stack_elt -= 1;
-
+
result = stack[stack_elt];
switch (op)
break;
case DW_OP_plus_uconst:
op_ptr = read_uleb128 (op_ptr, &utmp);
- result += utmp;
+ result += (_Unwind_Word)utmp;
break;
default:
_Unwind_Word first, second;
gcc_assert (stack_elt >= 2);
stack_elt -= 2;
-
+
second = stack[stack_elt];
first = stack[stack_elt + 1];
result = second - first;
break;
case DW_OP_mod:
- result = (_Unwind_Sword) second % (_Unwind_Sword) first;
+ result = second % first;
break;
case DW_OP_mul:
result = second * first;
result = second ^ first;
break;
case DW_OP_le:
- result = (_Unwind_Sword) first <= (_Unwind_Sword) second;
+ result = (_Unwind_Sword) second <= (_Unwind_Sword) first;
break;
case DW_OP_ge:
- result = (_Unwind_Sword) first >= (_Unwind_Sword) second;
+ result = (_Unwind_Sword) second >= (_Unwind_Sword) first;
break;
case DW_OP_eq:
- result = (_Unwind_Sword) first == (_Unwind_Sword) second;
+ result = (_Unwind_Sword) second == (_Unwind_Sword) first;
break;
case DW_OP_lt:
- result = (_Unwind_Sword) first < (_Unwind_Sword) second;
+ result = (_Unwind_Sword) second < (_Unwind_Sword) first;
break;
case DW_OP_gt:
- result = (_Unwind_Sword) first > (_Unwind_Sword) second;
+ result = (_Unwind_Sword) second > (_Unwind_Sword) first;
break;
case DW_OP_ne:
- result = (_Unwind_Sword) first != (_Unwind_Sword) second;
+ result = (_Unwind_Sword) second != (_Unwind_Sword) first;
break;
default:
case DW_OP_bra:
gcc_assert (stack_elt);
stack_elt -= 1;
-
+
offset = read_2s (op_ptr);
op_ptr += 2;
if (stack[stack_elt] != 0)
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;
case DW_CFA_set_loc:
{
_Unwind_Ptr pc;
-
+
insn_ptr = read_encoded_value (context, fs->fde_encoding,
insn_ptr, &pc);
fs->pc = (void *) pc;
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->cfa_reg);
insn_ptr = read_uleb128 (insn_ptr, &utmp);
- fs->cfa_offset = utmp;
- fs->cfa_how = CFA_REG_OFFSET;
+ 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->cfa_reg);
- fs->cfa_how = CFA_REG_OFFSET;
+ insn_ptr = read_uleb128 (insn_ptr, &utmp);
+ fs->regs.cfa_reg = (_Unwind_Word)utmp;
+ fs->regs.cfa_how = CFA_REG_OFFSET;
break;
case DW_CFA_def_cfa_offset:
insn_ptr = read_uleb128 (insn_ptr, &utmp);
- fs->cfa_offset = utmp;
+ fs->regs.cfa_offset = utmp;
/* cfa_how deliberately not set. */
break;
case DW_CFA_def_cfa_expression:
- fs->cfa_exp = insn_ptr;
- fs->cfa_how = CFA_EXP;
+ fs->regs.cfa_exp = insn_ptr;
+ fs->regs.cfa_how = CFA_EXP;
insn_ptr = read_uleb128 (insn_ptr, &utmp);
insn_ptr += utmp;
break;
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;
- fs->cfa_offset *= fs->data_align;
+ 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->cfa_offset);
- fs->cfa_offset *= fs->data_align;
+ 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;
}
if (fs->lsda_encoding != DW_EH_PE_omit)
{
_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)
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)
/* 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)
+ if (fs.regs.cfa_how == CFA_EXP)
return 0;
for (reg = 0; reg < PRE_GCC3_DWARF_FRAME_REGISTERS + 1; reg++)
}
}
- state_in->cfa_offset = fs.cfa_offset;
- state_in->cfa_reg = fs.cfa_reg;
+ state_in->cfa_offset = fs.regs.cfa_offset;
+ state_in->cfa_reg = fs.regs.cfa_reg;
state_in->retaddr_column = fs.retaddr_column;
state_in->args_size = context.args_size;
state_in->eh_ptr = fs.eh_ptr;
_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
#endif
/* Compute this frame's CFA. */
- switch (fs->cfa_how)
+ switch (fs->regs.cfa_how)
{
case CFA_REG_OFFSET:
- cfa = _Unwind_GetPtr (&orig_context, fs->cfa_reg);
- cfa += fs->cfa_offset;
+ cfa = _Unwind_GetPtr (&orig_context, fs->regs.cfa_reg);
+ cfa += fs->regs.cfa_offset;
break;
case CFA_EXP:
{
- const unsigned char *exp = fs->cfa_exp;
- _Unwind_Word len;
+ const unsigned char *exp = fs->regs.cfa_exp;
+ _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
__builtin_init_dwarf_reg_size_table (dwarf_reg_size_table);
}
-static void
+static void __attribute__((noinline))
uw_init_context_1 (struct _Unwind_Context *context,
void *outer_cfa, void *outer_ra)
{
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
/* Force the frame state to use the known cfa value. */
_Unwind_SetSpColumn (context, outer_cfa, &sp_slot);
- fs.cfa_how = CFA_REG_OFFSET;
- fs.cfa_reg = __builtin_dwarf_sp_column ();
- fs.cfa_offset = 0;
+ fs.regs.cfa_how = CFA_REG_OFFSET;
+ fs.regs.cfa_reg = __builtin_dwarf_sp_column ();
+ fs.regs.cfa_offset = 0;
uw_update_context_1 (context, &fs);
context->ra = __builtin_extract_return_addr (outer_ra);
}
+static void _Unwind_DebugHook (void *, void *)
+ __attribute__ ((__noinline__, __used__, __noclone__));
+
+/* This function is called during unwinding. It is intended as a hook
+ for a debugger to intercept exceptions. CFA is the CFA of the
+ target frame. HANDLER is the PC to which control will be
+ transferred. */
+static void
+_Unwind_DebugHook (void *cfa __attribute__ ((__unused__)),
+ void *handler __attribute__ ((__unused__)))
+{
+ asm ("");
+}
/* Install TARGET into CURRENT so that we can return to it. This is a
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); \
- } \
+#define uw_install_context(CURRENT, TARGET) \
+ do \
+ { \
+ long offset = uw_install_context_1 ((CURRENT), (TARGET)); \
+ void *handler = __builtin_frob_return_addr ((TARGET)->ra); \
+ _Unwind_DebugHook ((TARGET)->cfa, handler); \
+ __builtin_eh_return (offset, handler); \
+ } \
while (0)
static long
static inline _Unwind_Ptr
uw_identify_context (struct _Unwind_Context *context)
{
- return _Unwind_GetIP (context);
+ /* The CFA is not sufficient to disambiguate the context of a function
+ interrupted by a signal before establishing its frame and the context
+ of the signal itself. */
+ if (STACK_GROWS_DOWNWARD)
+ return _Unwind_GetCFA (context) - _Unwind_IsSignalFrame (context);
+ else
+ return _Unwind_GetCFA (context) + _Unwind_IsSignalFrame (context);
}
OSDN Git Service
