LinuxQuestions.org - Assembling a 32 bit sample program in a 64 bit world

Or argggg!

Ok So I'm trying to get a bit of sample code working so I did a little modification of a book example because in amd64 you can no longer use pushl, so I'm using pushq:

Code:

# cmovtest.s - An example of the CMOV instructions

.section .data

output:

  .asciz "The largest value is %d\n"

values:

  .int 105, 235, 61, 315, 134, 221, 53, 145, 117, 5

.section .text

.globl _start

_start:

  nop

  movl values, %ebx

  movl $1, %edi

  loop:

      movl values(, %edi, 4), %eax

      cmp %ebx, %eax

      cmova %eax, %ebx

      inc %edi

      cmp $10, %edi

  jne loop

  pushq %rbx

  pushq $output

  call printf

  addl $8, %esp

  pushq $0

  call exit

I have debugged and the seg fault occurs during the call to printf. Everything seems to function fine through the loop (all of the register values are what they should be). I guess I don't understand the magic going on with pushq enough to fix this myself. Any help would be greatly appreciated.

PS: This is being assembled on an amd64 Ubuntu with gas linking against ld-linux-x86-64.so.2