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ntdll: Add support for saving/restoring CFA frame state.

This commit is contained in:
Alexandre Julliard 2010-05-03 22:01:05 +02:00
parent 89f3afb012
commit bc3ae58f1d
1 changed files with 59 additions and 41 deletions
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100
dlls/ntdll/signal_x86_64.c
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@ -710,20 +710,28 @@ enum reg_rule
};
#define NB_FRAME_REGS 41
#define MAX_SAVED_STATES 16
struct frame_state
{
ULONG_PTR cfa_offset;
unsigned char cfa_reg;
enum reg_rule cfa_rule;
enum reg_rule rules[NB_FRAME_REGS];
ULONG64 regs[NB_FRAME_REGS];
};
struct frame_info
{
ULONG_PTR ip;
ULONG_PTR code_align;
LONG_PTR data_align;
ULONG_PTR cfa_offset;
enum reg_rule cfa_rule;
unsigned char cfa_reg;
unsigned char retaddr_reg;
unsigned char fde_encoding;
unsigned char signal_frame;
enum reg_rule rules[NB_FRAME_REGS];
ULONG64 regs[NB_FRAME_REGS];
unsigned char state_sp;
struct frame_state state;
struct frame_state *state_stack;
};
static const char *dwarf_reg_names[NB_FRAME_REGS] =
@ -765,8 +773,8 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
LONG_PTR offset = dwarf_get_uleb128( &ptr ) * info->data_align;
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_offset %s, %ld\n", info->ip, dwarf_reg_names[reg], offset );
info->regs[reg] = offset;
info->rules[reg] = RULE_CFA_OFFSET;
info->state.regs[reg] = offset;
info->state.rules[reg] = RULE_CFA_OFFSET;
break;
}
case DW_CFA_restore:
@ -774,7 +782,7 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR reg = op & 0x3f;
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_restore %s\n", info->ip, dwarf_reg_names[reg] );
info->rules[reg] = RULE_UNSET;
info->state.rules[reg] = RULE_UNSET;
break;
}
}
@ -819,8 +827,8 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
: dwarf_get_sleb128( &ptr ) * info->data_align;
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_offset_extended %s, %ld\n", info->ip, dwarf_reg_names[reg], offset );
info->regs[reg] = offset;
info->rules[reg] = RULE_CFA_OFFSET;
info->state.regs[reg] = offset;
info->state.rules[reg] = RULE_CFA_OFFSET;
break;
}
case DW_CFA_restore_extended:
@ -828,7 +836,7 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR reg = dwarf_get_uleb128( &ptr );
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_restore_extended %s\n", info->ip, dwarf_reg_names[reg] );
info->rules[reg] = RULE_UNSET;
info->state.rules[reg] = RULE_UNSET;
break;
}
case DW_CFA_undefined:
@ -836,7 +844,7 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR reg = dwarf_get_uleb128( &ptr );
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_undefined %s\n", info->ip, dwarf_reg_names[reg] );
info->rules[reg] = RULE_UNDEFINED;
info->state.rules[reg] = RULE_UNDEFINED;
break;
}
case DW_CFA_same_value:
@ -844,8 +852,8 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR reg = dwarf_get_uleb128( &ptr );
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_same_value %s\n", info->ip, dwarf_reg_names[reg] );
info->regs[reg] = reg;
info->rules[reg] = RULE_SAME;
info->state.regs[reg] = reg;
info->state.rules[reg] = RULE_SAME;
break;
}
case DW_CFA_register:
@ -854,15 +862,23 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR reg2 = dwarf_get_uleb128( &ptr );
if (!valid_reg( reg ) || !valid_reg( reg2 )) break;
TRACE( "%lx: DW_CFA_register %s == %s\n", info->ip, dwarf_reg_names[reg], dwarf_reg_names[reg2] );
info->regs[reg] = reg2;
info->rules[reg] = RULE_OTHER_REG;
info->state.regs[reg] = reg2;
info->state.rules[reg] = RULE_OTHER_REG;
break;
}
case DW_CFA_remember_state:
FIXME( "%lx: DW_CFA_remember_state not implemented\n", info->ip );
TRACE( "%lx: DW_CFA_remember_state\n", info->ip );
if (info->state_sp >= MAX_SAVED_STATES)
FIXME( "%lx: DW_CFA_remember_state too many nested saves\n", info->ip );
else
info->state_stack[info->state_sp++] = info->state;
break;
case DW_CFA_restore_state:
FIXME( "%lx: DW_CFA_restore_state not implemented\n", info->ip );
TRACE( "%lx: DW_CFA_restore_state\n", info->ip );
if (!info->state_sp)
FIXME( "%lx: DW_CFA_restore_state without corresponding save\n", info->ip );
else
info->state = info->state_stack[--info->state_sp];
break;
case DW_CFA_def_cfa:
case DW_CFA_def_cfa_sf:
@ -872,9 +888,9 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
: dwarf_get_sleb128( &ptr ) * info->data_align;
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_def_cfa %s, %lu\n", info->ip, dwarf_reg_names[reg], offset );
info->cfa_reg = reg;
info->cfa_offset = offset;
info->cfa_rule = RULE_CFA_OFFSET;
info->state.cfa_reg = reg;
info->state.cfa_offset = offset;
info->state.cfa_rule = RULE_CFA_OFFSET;
break;
}
case DW_CFA_def_cfa_register:
@ -882,8 +898,8 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR reg = dwarf_get_uleb128( &ptr );
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_def_cfa_register %s\n", info->ip, dwarf_reg_names[reg] );
info->cfa_reg = reg;
info->cfa_rule = RULE_CFA_OFFSET;
info->state.cfa_reg = reg;
info->state.cfa_rule = RULE_CFA_OFFSET;
break;
}
case DW_CFA_def_cfa_offset:
@ -892,8 +908,8 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR offset = (op == DW_CFA_def_cfa_offset) ? dwarf_get_uleb128( &ptr )
: dwarf_get_sleb128( &ptr ) * info->data_align;
TRACE( "%lx: DW_CFA_def_cfa_offset %lu\n", info->ip, offset );
info->cfa_offset = offset;
info->cfa_rule = RULE_CFA_OFFSET;
info->state.cfa_offset = offset;
info->state.cfa_rule = RULE_CFA_OFFSET;
break;
}
case DW_CFA_def_cfa_expression:
@ -901,8 +917,8 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
ULONG_PTR expr = (ULONG_PTR)ptr;
ULONG_PTR len = dwarf_get_uleb128( &ptr );
TRACE( "%lx: DW_CFA_def_cfa_expression %lx-%lx\n", info->ip, expr, expr+len );
info->cfa_offset = expr;
info->cfa_rule = RULE_VAL_EXPRESSION;
info->state.cfa_offset = expr;
info->state.cfa_rule = RULE_VAL_EXPRESSION;
ptr += len;
break;
}
@ -915,8 +931,8 @@ static void execute_cfa_instructions( const unsigned char *ptr, const unsigned c
if (!valid_reg( reg )) break;
TRACE( "%lx: DW_CFA_%sexpression %s %lx-%lx\n",
info->ip, (op == DW_CFA_expression) ? "" : "val_", dwarf_reg_names[reg], expr, expr+len );
info->regs[reg] = expr;
info->rules[reg] = (op == DW_CFA_expression) ? RULE_EXPRESSION : RULE_VAL_EXPRESSION;
info->state.regs[reg] = expr;
info->state.rules[reg] = (op == DW_CFA_expression) ? RULE_EXPRESSION : RULE_VAL_EXPRESSION;
ptr += len;
break;
}
@ -1111,46 +1127,46 @@ static ULONG_PTR eval_expression( const unsigned char *p, CONTEXT *context )
}
/* apply the computed frame info to the actual context */
static void apply_frame_info( CONTEXT *context, struct frame_info *info )
static void apply_frame_state( CONTEXT *context, struct frame_state *state )
{
unsigned int i;
ULONG_PTR cfa, value;
CONTEXT new_context = *context;
switch (info->cfa_rule)
switch (state->cfa_rule)
{
case RULE_EXPRESSION:
cfa = *(ULONG_PTR *)eval_expression( (const unsigned char *)info->cfa_offset, context );
cfa = *(ULONG_PTR *)eval_expression( (const unsigned char *)state->cfa_offset, context );
break;
case RULE_VAL_EXPRESSION:
cfa = eval_expression( (const unsigned char *)info->cfa_offset, context );
cfa = eval_expression( (const unsigned char *)state->cfa_offset, context );
break;
default:
cfa = *(ULONG_PTR *)get_context_reg( context, info->cfa_reg ) + info->cfa_offset;
cfa = *(ULONG_PTR *)get_context_reg( context, state->cfa_reg ) + state->cfa_offset;
break;
}
if (!cfa) return;
for (i = 0; i < NB_FRAME_REGS; i++)
{
switch (info->rules[i])
switch (state->rules[i])
{
case RULE_UNSET:
case RULE_UNDEFINED:
case RULE_SAME:
break;
case RULE_CFA_OFFSET:
set_context_reg( &new_context, i, (char *)cfa + info->regs[i] );
set_context_reg( &new_context, i, (char *)cfa + state->regs[i] );
break;
case RULE_OTHER_REG:
set_context_reg( &new_context, i, get_context_reg( context, info->regs[i] ));
set_context_reg( &new_context, i, get_context_reg( context, state->regs[i] ));
break;
case RULE_EXPRESSION:
value = eval_expression( (const unsigned char *)info->regs[i], context );
value = eval_expression( (const unsigned char *)state->regs[i], context );
set_context_reg( &new_context, i, (void *)value );
break;
case RULE_VAL_EXPRESSION:
value = eval_expression( (const unsigned char *)info->regs[i], context );
value = eval_expression( (const unsigned char *)state->regs[i], context );
set_context_reg( &new_context, i, &value );
break;
}
@ -1173,10 +1189,12 @@ static NTSTATUS dwarf_virtual_unwind( ULONG64 ip, ULONG64 *frame,CONTEXT *contex
const unsigned char *ptr, *augmentation, *end;
ULONG_PTR len, code_end;
struct frame_info info;
struct frame_state state_stack[MAX_SAVED_STATES];
int aug_z_format = 0;
unsigned char lsda_encoding = DW_EH_PE_omit;
memset( &info, 0, sizeof(info) );
info.state_stack = state_stack;
info.ip = (ULONG_PTR)bases->func;
*handler = NULL;
@ -1194,7 +1212,7 @@ static NTSTATUS dwarf_virtual_unwind( ULONG64 ip, ULONG64 *frame,CONTEXT *contex
info.code_align = dwarf_get_uleb128( &ptr );
info.data_align = dwarf_get_sleb128( &ptr );
info.retaddr_reg = *ptr++;
info.cfa_rule = RULE_CFA_OFFSET;
info.state.cfa_rule = RULE_CFA_OFFSET;
TRACE( "function %lx base %p cie %p len %x id %x version %x aug '%s' code_align %lu data_align %ld retaddr %s\n",
ip, bases->func, cie, cie->length, cie->id, cie->version, cie->augmentation,
@ -1253,7 +1271,7 @@ static NTSTATUS dwarf_virtual_unwind( ULONG64 ip, ULONG64 *frame,CONTEXT *contex
TRACE( "fde %p len %x personality %p lsda %p code %lx-%lx\n",
fde, fde->length, *handler, *handler_data, info.ip, code_end );
execute_cfa_instructions( ptr, end, ip, &info );
apply_frame_info( context, &info );
apply_frame_state( context, &info.state );
*frame = context->Rsp;
TRACE( "next function rip=%016lx\n", context->Rip );