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gdb/1756: GDB displays xmm registers incorrectly when executable linked with libpthread
- From: anight at monamour dot ru
- To: gdb-gnats at sources dot redhat dot com
- Date: 24 Aug 2004 09:45:33 -0000
- Subject: gdb/1756: GDB displays xmm registers incorrectly when executable linked with libpthread
- Reply-to: anight at monamour dot ru
>Number: 1756
>Category: gdb
>Synopsis: GDB displays xmm registers incorrectly when executable linked with libpthread
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Aug 24 09:48:01 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator: anight@monamour.ru
>Release: unknown-1.0
>Organization:
>Environment:
SuSE linux 8.2, 9.1
>Description:
GDB displays xmm register contents incorrectly when executable linked with libpthread (may be other libraries too, not confirmed yet)
>How-To-Repeat:
> cat bug.c
#include <stdio.h>
int a[4] = { 1, 2, 3, 4 };
int b[4] = { 0, 0, 0, 0 };
int main()
{
asm(" movups a, %xmm0\n"
" movups %xmm0, b\n"
" int $3\n");
printf("b = 0x%08x 0x%08x 0x%08x 0x%08x\n", b[0], b[1], b[2], b[3]);
return 0;
}
> gcc bug.c
> gdb ./a.out
GNU gdb 6.2
...
(gdb) r
Starting program: /..../a.out
Program received signal SIGTRAP, Trace/breakpoint trap.
0x080483ab in main ()
(gdb) p $xmm0.uint128
$1 = 0x00000004000000030000000200000001
(gdb) c
Continuing.
b = 0x00000001 0x00000002 0x00000003 0x00000004
Program exited normally.
(gdb) quit
> gcc bug.c -lpthread
> gdb ./a.out
GNU gdb 6.2
...
(gdb) r
Starting program: /..../a.out
[Thread debugging using libthread_db enabled]
[New Thread 1075131488 (LWP 28203)]
Program received signal SIGTRAP, Trace/breakpoint trap.
[Switching to Thread 1075131488 (LWP 28203)]
0x080483eb in main ()
(gdb) p $xmm0.uint128
$1 = 0xffffffffffffffffffffffffffffffff
(gdb) c
Continuing.
b = 0x00000001 0x00000002 0x00000003 0x00000004
Program exited normally.
(gdb) quit
>
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: