porting kode c ke asm

[mywisdom]

malloc()

sh-3.2# cat malloc.c

Code:

#include <stdlib.h>
int main()
{
int *pointer;
int i=0;
for (;;)
{
pointer=(int*) malloc(sizeof(int));
pointer=&i;
i++;
}
}

kompile :

Code:

gcc -S malloc.c

sh-3.2# cat malloc.s

Code:

.file   "malloc.c"
        .text
.globl main
        .type   main, @function
main:
        leal    4(%esp), %ecx
        andl    $-16, %esp
        pushl   -4(%ecx)
        pushl   %ebp
        movl    %esp, %ebp
        pushl   %ecx
        subl    $20, %esp
        movl    $0, -12(%ebp)
.L2:
        movl    $4, (%esp)
        call    malloc
        movl    %eax, -8(%ebp)
        leal    -12(%ebp), %eax
        movl    %eax, -8(%ebp)
        movl    -12(%ebp), %eax
        addl    $1, %eax
        movl    %eax, -12(%ebp)
        jmp     .L2
        .size   main, .-main
        .ident  "GCC: (GNU) 4.1.2 20080704 (Red Hat 4.1.2-48)"
        .section        .note.GNU-stack,"",@progbits

pagesize()

Code:

sh-3.2# cat page.c
int  getpagesize();
int main()
        {
int i=getpagesize();
        printf ("\nUkuran page adalah : %d\n",i);
}

Code:

gcc -S page.c

sh-3.2# cat page.s

Code:

.file   "page.c"
        .section        .rodata
.LC0:
        .string "\nUkuran page adalah : %d\n"
        .text
.globl main
        .type   main, @function
main:
        leal    4(%esp), %ecx
        andl    $-16, %esp
        pushl   -4(%ecx)
        pushl   %ebp
        movl    %esp, %ebp
        pushl   %ecx
        subl    $36, %esp
        call    getpagesize
        movl    %eax, -8(%ebp)
        movl    -8(%ebp), %eax
        movl    %eax, 4(%esp)
        movl    $.LC0, (%esp)
        call    printf
        addl    $36, %esp
        popl    %ecx
        popl    %ebp
        leal    -4(%ecx), %esp
        ret
        .size   main, .-main
        .ident  "GCC: (GNU) 4.1.2 20080704 (Red Hat 4.1.2-48)"
        .section        .note.GNU-stack,"",@progbits