On 4/22/06, Andrew Haley <aph@xxxxxxxxxxx> wrote:> 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?
Sorry no debugger... this is a part of the 1st program running (well... trying to run)
The only debug ways usable in the code right now are some things like :i = (long)(fmt);__asm__ volatile ("mov %0, %%eax\n":: "m"(i));__asm__ volatile ("l1: jmp l1");
which are really dirty i agree...
--Thibaud
