* Bug: 'movl %ss, (%ebp)' produce an error for target i686 (32 bit):
" Error: suffix or operands invalid for `mov' "
* Version of `as'.
>>> as --version >>>
GNU assembler 2.16.91 20050827
This assembler was configured for a target of `i686-pc-linux-gnu'.
<<< end <<<
* Source from mingw (no additional patches)
http://heanet.dl.sourceforge.net/sourceforge/mingw/
binutils-2.16.91-20050827-1-src.tar.gz
* Type of machine: i686
* Operating system: SuSE Linux 9.0
* 'as' compiled with: gcc (GCC) 3.3.1 (SuSE Linux)
Configured with prefix only,
target was auto detect as 'i686-pc-linux-gnu'.
* The inputfile was a C file with inline assembler.
A "gcc movl_ss_bp.c" stop with an error, if using AS version 2.16.91.
>>> inputfile: movl_ss_bp.c >>>
int main (void)
{
__asm__(" movl %ss, 0x40(%ebp)");
__asm__(" movl %ss, (%ebp)");
__asm__(" movl %ss, -16(%ebp)");
return (0);
}
<<< end inputfile <<<
* For error tracking build assembler output with 'gcc -S movl_ss_bp.c'
>>> cat movl_ss_bp.s >>>
.file "movl_ss_bp.c"
.text
.globl main
.type main, @function
main:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
andl $-16, %esp
movl $0, %eax
subl %eax, %esp
#APP
movl %ss, 0x40(%ebp)
movl %ss, (%ebp)
movl %ss, -16(%ebp)
#NO_APP
movl $0, %eax
leave
ret
.size main, .-main
.ident "GCC: (GNU) 3.3.1 (SuSE Linux)"
<<< end <<<
* Using this file as input for assembler produce the bug.
>>> output from 'as movl_ss_bp.s' >>>
movl_ss_bp.s: Assembler messages:
movl_ss_bp.s:13: Error: suffix or operands invalid for `mov'
movl_ss_bp.s:14: Error: suffix or operands invalid for `mov'
movl_ss_bp.s:15: Error: suffix or operands invalid for `mov'
<<< end error output <<<
* Other assembler versions tested with same source 'movl_ss_bp.s':
2.14.90.0.5 20030722 (SuSE Linux), target i586-suse-linux: OK
2.15.91 20040904 (Mingw source), target i686-pc-mingw32: OK
2.15.94 20050118 (Mingw source), target i686-pc-linux-gnu: OK
2.16.91 20050827 (Mingw source), target i686-pc-linux-gnu: fail
2.16.91 20050827 (Mingw source), target i686-pc-mingw32: fail
* Other sample for this find in building of Linux kernel 2.6.11 for
i386. Assembler stopps with same error message for all inline assembler
lines in the file arch/i386/kernel/process.c with register usage FS or
GS. Listed some of them:
movl %fs,488(%eax)
movl %gs,492(%eax)
movl %fs,40(%esi)
movl %gs,44(%esi)
movl 40(%ebx),%fs
movl 44(%ebx),%gs
>>> grep linux-2.6.11/arch/i386/kernel/process.c >>>
int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
unsigned long unused,
struct task_struct * p, struct pt_regs * regs)
{
...
savesegment(fs,p->thread.fs);
savesegment(gs,p->thread.gs);
<<< end <<<
>>> grep preprocessor output >>>
asm volatile("movl %%" "fs" ",%0":"=m" (*(int *)&(p->thread.fs)));
asm volatile("movl %%" "gs" ",%0":"=m" (*(int *)&(p->thread.gs)));
<<< end <<<
>>> grep assembler inputfile >>>
movl %fs,488(%eax)
movl %gs,492(%eax)
<<< end <<<
* If I use "mov %ss,(%ebp)", than the assembler build the right code.
But 'objdump -d' from same binutils version shows the "movl" again:
13: 8c 55 00 movl %ss,0x0(%ebp)
--
Henry Nestler
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