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* [Bug debug/42403] New: Incorrect CFI: doesn't readjust CFA after pop
@ 2009-12-17 13:55 tschwinge at gcc dot gnu dot org
2009-12-17 14:12 ` [Bug debug/42403] " tschwinge at gcc dot gnu dot org
2010-01-04 11:32 ` ramana at gcc dot gnu dot org
0 siblings, 2 replies; 3+ messages in thread
From: tschwinge at gcc dot gnu dot org @ 2009-12-17 13:55 UTC (permalink / raw)
To: gcc-bugs
$ install/bin/arm-none-linux-gnueabi-gcc --version
arm-none-linux-gnueabi-gcc (GCC) 4.5.0 20091214 (experimental)
[...]
GCC fails to re-adjust the CFA after pop:
$ cat d.c
void foo(void)
{
register int r7 asm("r7");
asm volatile ("" : : "r" (r7) : "memory");
}
$ install/bin/arm-none-linux-gnueabi-gcc -g -O -c -o d.o d.c
$ install/bin/arm-none-linux-gnueabi-objdump -dr d.o
d.o: file format elf32-littlearm
Disassembly of section .text:
00000000 <foo>:
0: e52d7004 push {r7} ; (str r7, [sp, #-4]!)
4: e8bd0080 pop {r7}
8: e12fff1e bx lr
$ install/bin/arm-none-linux-gnueabi-readelf -wf d.o
Contents of the .debug_frame section:
00000000 0000000c ffffffff CIE
Version: 1
Augmentation: ""
Code alignment factor: 1
Data alignment factor: -4
Return address column: 14
DW_CFA_def_cfa: r13 ofs 0
00000010 00000014 00000000 FDE cie=00000000 pc=00000000..0000000c
DW_CFA_advance_loc: 4 to 00000004
DW_CFA_def_cfa_offset: 4
DW_CFA_offset: r7 at cfa-4
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
For correctness, GCC should emit .cfi_adjust_cfa_offset 0 and
.cfi_restore r7 at pos. 8.
--
Summary: Incorrect CFI: doesn't readjust CFA after pop
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tschwinge at gcc dot gnu dot org
GCC target triplet: arm-none-linux-gnueabi
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42403
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug debug/42403] Incorrect CFI: doesn't readjust CFA after pop
2009-12-17 13:55 [Bug debug/42403] New: Incorrect CFI: doesn't readjust CFA after pop tschwinge at gcc dot gnu dot org
@ 2009-12-17 14:12 ` tschwinge at gcc dot gnu dot org
2010-01-04 11:32 ` ramana at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: tschwinge at gcc dot gnu dot org @ 2009-12-17 14:12 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from tschwinge at gcc dot gnu dot org 2009-12-17 14:12 -------
Last paragraph: .cfi_adjust_cfa_offset *-4*, of course.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42403
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug debug/42403] Incorrect CFI: doesn't readjust CFA after pop
2009-12-17 13:55 [Bug debug/42403] New: Incorrect CFI: doesn't readjust CFA after pop tschwinge at gcc dot gnu dot org
2009-12-17 14:12 ` [Bug debug/42403] " tschwinge at gcc dot gnu dot org
@ 2010-01-04 11:32 ` ramana at gcc dot gnu dot org
1 sibling, 0 replies; 3+ messages in thread
From: ramana at gcc dot gnu dot org @ 2010-01-04 11:32 UTC (permalink / raw)
To: gcc-bugs
--
ramana at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2010-01-04 11:31:57
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42403
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2010-01-04 11:32 UTC | newest]
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2009-12-17 13:55 [Bug debug/42403] New: Incorrect CFI: doesn't readjust CFA after pop tschwinge at gcc dot gnu dot org
2009-12-17 14:12 ` [Bug debug/42403] " tschwinge at gcc dot gnu dot org
2010-01-04 11:32 ` ramana at gcc dot gnu dot org
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