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Date: Mon, 26 Jul 2010 09:37:00 -0000
From: "jan dot kratochvil at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Message-ID: <20100726093712.11842.jan.kratochvil@redhat.com>
Reply-To: sourceware-bugzilla@sourceware.org
Subject: [Bug gdb/11842] New: compat_siginfo_from_siginfo and siginfo_from_compat_siginfo are wrong
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Only biarch gdb is affected.

#include <unistd.h>
#include <sys/syscall.h>
#include <signal.h>
#define tgkill(tgid, tid, sig) syscall (__NR_tgkill, tgid, tid, sig)
int
main (void)
{
  return tgkill (getpid (), getpid (), SIGUSR1);
}

gcc -o 1 1.c -Wall -g -m32

GNU gdb (GDB) 7.2.50.20100726-cvs
This GDB was configured as "x86_64-unknown-linux-gnu".
gcc-4.4.4-10.fc13.x86_64
kernel-2.6.33.6-147.fc13.x86_64

./gdb -nx -ex start -ex 'p getpid ()' -ex c -ex 'p
$_siginfo._sifields._kill.si_pid' ./1
[...]
$1 = 23172
Continuing.

Program received signal SIGUSR1, User defined signal 1.
0x00110430 in __kernel_vsyscall ()
$2 = 0

$1 and $2 are the same for native x86_64 and for native i686.
$1 and $2 SHOULD be the same even for i686 on x86_64 debugger.

compat_siginfo_from_siginfo and siginfo_from_compat_siginfo are wrong in:
gdb/gdbserver/linux-x86-low.c
gdb/amd64-linux-nat.c

-- 
           Summary: compat_siginfo_from_siginfo and
                    siginfo_from_compat_siginfo are wrong
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: gdb
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: jan dot kratochvil at redhat dot com
                CC: gdb-prs at sourceware dot org
GCC target triplet: x86_64-fedora13-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=11842

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