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* dwarf2-frame.h (enum dwarf2_frame_reg_rule): Add

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DWARF2_FRAME_REG_SAVED_VAL_OFFSET and
DWARF2_FRAME_REG_SAVED_VAL_EXP.
* dwarf2-frame.c (execute_cfa_program): Handle val_offset,
val_offset_sf and val_expression.
(dwarf2_frame_prev_register): Handle the new reg rules.
(dwarf2_frame_this_id): Use pc instead of function entry point.
This commit is contained in:
Alexandre Oliva 2006-05-28 05:56:50 +00:00
parent 56c987f606
commit 46ea248bcc
3 changed files with 64 additions and 0 deletions
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10
gdb/ChangeLog
View File

@ -1,3 +1,13 @@
2006-05-28 Alexandre Oliva <aoliva@redhat.com>
* dwarf2-frame.h (enum dwarf2_frame_reg_rule): Add
DWARF2_FRAME_REG_SAVED_VAL_OFFSET and
DWARF2_FRAME_REG_SAVED_VAL_EXP.
* dwarf2-frame.c (execute_cfa_program): Handle val_offset,
val_offset_sf and val_expression.
(dwarf2_frame_prev_register): Handle the new reg rules.
(dwarf2_frame_this_id): Use pc instead of function entry point.
2006-05-28 Alexandre Oliva <aoliva@redhat.com>
* dwarf2-frame.c (struct dwarf2_cie): Add signal_frame field.

50
gdb/dwarf2-frame.c
View File

@ -481,6 +481,34 @@ bad CFI data; mismatched DW_CFA_restore_state at 0x%s"), paddr (fs->pc));
fs->regs.reg[reg].loc.offset = offset;
break;
case DW_CFA_val_offset:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
offset = utmp * fs->data_align;
fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
break;
case DW_CFA_val_offset_sf:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
offset *= fs->data_align;
fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_OFFSET;
fs->regs.reg[reg].loc.offset = offset;
break;
case DW_CFA_val_expression:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &reg);
dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
insn_ptr = read_uleb128 (insn_ptr, insn_end, &utmp);
fs->regs.reg[reg].loc.exp = insn_ptr;
fs->regs.reg[reg].exp_len = utmp;
fs->regs.reg[reg].how = DWARF2_FRAME_REG_SAVED_VAL_EXP;
insn_ptr += utmp;
break;
case DW_CFA_def_cfa_sf:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
if (eh_frame_p)
@ -965,6 +993,28 @@ dwarf2_frame_prev_register (struct frame_info *next_frame, void **this_cache,
}
break;
case DWARF2_FRAME_REG_SAVED_VAL_OFFSET:
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
*realnump = -1;
if (valuep)
store_unsigned_integer (valuep, register_size (gdbarch, regnum),
cache->cfa + cache->reg[regnum].loc.offset);
break;
case DWARF2_FRAME_REG_SAVED_VAL_EXP:
*optimizedp = 0;
*lvalp = not_lval;
*addrp = 0;
*realnump = -1;
if (valuep)
store_unsigned_integer (valuep, register_size (gdbarch, regnum),
execute_stack_op (cache->reg[regnum].loc.exp,
cache->reg[regnum].exp_len,
next_frame, cache->cfa));
break;
case DWARF2_FRAME_REG_UNSPECIFIED:
/* GCC, in its infinite wisdom decided to not provide unwind
information for registers that are "same value". Since

4
gdb/dwarf2-frame.h
View File

@ -51,6 +51,10 @@ enum dwarf2_frame_reg_rule
DWARF2_FRAME_REG_SAVED_EXP,
DWARF2_FRAME_REG_SAME_VALUE,
/* These are defined in Dwarf3. */
DWARF2_FRAME_REG_SAVED_VAL_OFFSET,
DWARF2_FRAME_REG_SAVED_VAL_EXP,
/* These aren't defined by the DWARF2 CFI specification, but are
used internally by GDB. */
DWARF2_FRAME_REG_RA, /* Return Address. */