Thibaud GUERIN writes: > On 4/21/06, Andrew Haley <aph@xxxxxxxxxxx> wrote: > > Thibaud GUERIN writes: > > > > > > > > OK, so we've got rid of the asms and casting away const, and the code > > still doesn't work. > > > > So, your code is now, at last, legal C. Let's have a look at the > > assembly code generated for my_own_printf (use gcc -S). Be sure to > > include the exact command line you used. > my_own_printf: Args are just below sp. > pushl %ebp > movl %esp, %ebp ebp points to: frame, retaddr, arg0 > subl $8, %esp > leal 8(%ebp), %eax eax contains ebp+8: it points to arg0 > movl %eax, -4(%ebp) save eax on the stack > movl -4(%ebp), %eax restore it > movl (%eax), %eax load eax from arg0 > cmpl 8(%ebp), %eax compare eax with the memory at ebp+8 > jne .L33 So, the memory word at ebp+8 is compared with the memory at ebp+8. Do you have a debuuger that can single-step through this code, one insn at a time? Andrew.
