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[PATCH] Add support for missing DWARF2 call frame instructions
- From: Mark Kettenis <kettenis at chello dot nl>
- To: gdb-patches at sources dot redhat dot com
- Date: Sun, 18 Jan 2004 22:22:54 +0100 (CET)
- Subject: [PATCH] Add support for missing DWARF2 call frame instructions
This adds the missing CFI's from the DWARF3 draft. I moved DW_CFA_nop
to keep things in the same order as the DWARF specification.
Committed,
Mark
Index: ChangeLog
from Mark Kettenis <kettenis@gnu.org>
* dwarf2-frame.c (execute_cfa_program): Move DWA_CFA_nop before
DW_CFA_def_cfa_exporession. Add support for
DW_CFA_offset_extendend_sf, DW_CFA_def_cfa_sf and
DW_CFA_def_cfa_offset_sf. This should fix PR backtrace/1391.
Index: dwarf2-frame.c
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2-frame.c,v
retrieving revision 1.25
diff -u -p -r1.25 dwarf2-frame.c
--- dwarf2-frame.c 27 Dec 2003 23:15:00 -0000 1.25
+++ dwarf2-frame.c 18 Jan 2004 21:20:56 -0000
@@ -432,6 +432,9 @@ execute_cfa_program (unsigned char *insn
/* cfa_how deliberately not set. */
break;
+ case DW_CFA_nop:
+ break;
+
case DW_CFA_def_cfa_expression:
insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_exp_len);
fs->cfa_exp = insn_ptr;
@@ -449,7 +452,26 @@ execute_cfa_program (unsigned char *insn
insn_ptr += utmp;
break;
- case DW_CFA_nop:
+ case DW_CFA_offset_extended_sf:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, ®);
+ insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
+ offset += fs->data_align;
+ dwarf2_frame_state_alloc_regs (&fs->regs, reg + 1);
+ fs->regs.reg[reg].how = REG_SAVED_OFFSET;
+ fs->regs.reg[reg].loc.offset = offset;
+ break;
+
+ case DW_CFA_def_cfa_sf:
+ insn_ptr = read_uleb128 (insn_ptr, insn_end, &fs->cfa_reg);
+ insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
+ fs->cfa_offset = offset * fs->data_align;
+ fs->cfa_how = CFA_REG_OFFSET;
+ break;
+
+ case DW_CFA_def_cfa_offset_sf:
+ insn_ptr = read_sleb128 (insn_ptr, insn_end, &offset);
+ fs->cfa_offset = offset * fs->data_align;
+ /* cfa_how deliberately not set. */
break;
case DW_CFA_GNU_args_size: