gas bug

[Andrew Morton <andrewm at uow dot edu dot au>]

The gas which comes with Mandrake 7.0 is generating bad code for me.

mnm:/home/morton> uname -a
Linux mnm.uow.edu.au 2.2.14-15mdk #1 Tue Jan 4 22:24:20 CET 2000 i686 unknown

mnm:/home/morton> which as
/usr/bin/as

mnm:/home/morton> rpm -qf /usr/bin/as
binutils-2.9.5.0.16-2mdk

mnm:/home/morton> rpm -V binutils

mnm:/home/morton> as -v
GNU assembler version 2.9.5 (i686-pc-linux-gnu) using BFD version 2.9.5.0.16

Here's the input:

        movb %dl,373(%ebp)
        movl %ebx,368(%ebp)
        movw 328(%esp),%dx
        addw $14,%dx
        movl $2048,%eax
#APP
        outw %ax,%dx
#NO_APP
        xorl %ebx,%ebx
        movw 328(%esp),%cx
        addw $10,%cx
        .align 4
.L4148:
        movl %ebx,%eax
        addw $560,%ax
        movl %ecx,%edx
#APP
        outw %ax,%dx
#NO_APP

Here's the output from objdump -D:

 715:   88 95 75 01 00 00       mov    %dl,0x175(%ebp)
 71b:   89 9d 70 01 00 00       mov    %ebx,0x170(%ebp)
 721:   66 8b 94 24 48 01 00    mov    0x148(%esp,1),%dx
 728:   00
 729:   66 83 c2 0e             add    $0xe,%dx
 72d:   b8 00 08 00 00          mov    $0x800,%eax
 732:   66 ef                   out    %ax,(%dx)
 734:   31 db                   xor    %ebx,%ebx
 736:   66 8b 8c 24 48 01 00    mov    0x148(%esp,1),%cx
 73d:   00
 73e:   66 83 c1 0a             add    $0xa,%cx
 742:   00 00                   add    %al,(%eax)  <<<------- Ouch!
 744:   89 d8                   mov    %ebx,%eax
 746:   66 05 30 02             add    $0x230,%ax
 74a:   89 ca                   mov    %ecx,%edx
 74c:   66 ef                   out    %ax,(%dx)

I've put the assembler source file up at http://www.uow.edu.au/~andrewm/3c59x.s.gz

The code section which I have shown above starts at line 1068 of 3c59x.s.

I am assembling it with

as -V -Qy -o 3c59x.o 3c59x.s

Thanks.

-- 
-akpm-