disconcerting disassembly

[Jan Kok]

Hi Guys,   Can someone explain why the disassembly of crt0.o shown below doesn't match the cpp code in crt0.s?  In particular, the subw isn't shown in the disassembly, the data32 turns into data16, and so on.   Have I got a bad version of assembler?   gcc -v Reading specs from /usr/lib/gcc-lib/i486-suse-linux/2.95.2/specs gcc version 2.95.2 19991024 (release)   Is there a better way to disassemble code?  Is there a way to disassemble the linuxbios.strip file?   Thanks, - Jan   ................................................. cat crt0.s    _start  :  cli  xorl %eax, %eax  movl %eax, %cr3      invd  movw %cs, %ax  shlw $4, %ax  movw $ gdtptr16_offset  , %bx  subw %ax, %bx                    <--------  data32  lgdt %cs:(%bx)  movl %cr0, %eax  andl $0x7FFAFFD1, %eax   orl $0x60000001, %eax   movl %eax, %cr0  data32 ljmp $0x10, $__protected_start .................................................. objdump -d crt0.o   crt0.o:     file format elf32-i386   Disassembly of section .text:      0:   fa                      cli    1:   66 31 c0                xor    %ax,%ax    4:   0f 22 d8                mov    %eax,%cr3    7:   0f 08                   invd    9:   8c c8                   mov    %cs,%eax    b:   c1 e0 04                shl    $0x4,%eax    e:   bb 00 00 29 c3          mov    $0xc3290000,%ebx                                           <----------- ?   13:   66                      data16   14:   2e 0f 01 17             lgdt   %cs:(%edi)   18:   0f 20 c0                mov    %cr0,%eax   1b:   66 25 d1 ff             and    $0xffd1,%ax   1f:   fa                      cli   20:   7f 66                   jg     88 <__protected_start+0x15> .................................................. od -Ax -tx1 linuxbios.strip 000000 fa 66 31 c0 0f 22 d8 0f 08 8c c8 c1 e0 04 bb 34 000010 00 29 c3 66 2e 0f 01 17 0f 20 c0 66 25 d1 ff fa 000020 7f 66 0d 01 00 00 60 0f 22 c0 66 ea 73 00 0f 00