C到汇编语言的转换步骤详解-优快云博客

本文详细介绍了如何将C语言代码转换为汇编语言，包括预处理、汇编、编译和链接四个步骤，并提供了一个简单的C程序作为示例，展示了对应的汇编代码。

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Compile:

1. redirect, preprocess

gcc -E test_asm.c -o test_asm.i

2. to asm

gcc -S test_asm.i -o tset_asm.s

3. to obj

gcc -c test_asm.s -o test_asm.o

4. link

gcc test_asm.o -o test_asm

=====

fred@fred-Vostro-2420:~/myspace/sets/test$ gcc -E test_asm.c -o test_asm.i
fred@fred-Vostro-2420:~/myspace/sets/test$ gcc -S test_asm.i -o test_asm.s
fred@fred-Vostro-2420:~/myspace/sets/test$ gcc -c test_asm.s -o test_asm.o
fred@fred-Vostro-2420:~/myspace/sets/test$ gcc test_asm.o -o test_asm
fred@fred-Vostro-2420:~/myspace/sets/test$ ./test_asm
i=6, j=5
fred@fred-Vostro-2420:~/myspace/sets/test$

1) .c

fred@fred-Vostro-2420:~/myspace/sets/test$ more test_asm.c
#include<stdlib.h>
#include<stdio.h>
int swap(int *a, int *b)
{
    int middle = *b;
    *b = *a;
    *a = middle;
    return 0;
}

int main(int argc, char *argv[])
{
    int i = 5;
    int j;

    j = 6;
    swap(&i, &j);

    printf("i=%d, j=%d\n", i, j);

    return 0;
}
fred@fred-Vostro-2420:~/myspace/sets/test$

2) .asm

fred@fred-Vostro-2420:~/myspace/sets/test$ more test_asm.s
   .file   "test_asm.c"
   .text
   .globl   swap
   .type   swap, @function
swap:
.LFB2:
   .cfi_startproc
   pushl   %ebp
   .cfi_def_cfa_offset 8
   .cfi_offset 5, -8
   movl   %esp, %ebp
   .cfi_def_cfa_register 5
   subl   $16, %esp
   movl   12(%ebp), %eax
   movl   (%eax), %eax
   movl   %eax, -4(%ebp)
   movl   8(%ebp), %eax
   movl   (%eax), %edx
   movl   12(%ebp), %eax
   movl   %edx, (%eax)
   movl   8(%ebp), %eax
   movl   -4(%ebp), %edx
   movl   %edx, (%eax)
   movl   $0, %eax
   leave
   .cfi_restore 5
   .cfi_def_cfa 4, 4
   ret
   .cfi_endproc
.LFE2:
   .size   swap, .-swap
   .section   .rodata
.LC0:
   .string   "i=%d, j=%d\n"
   .text
   .globl   main
   .type   main, @function
main:
.LFB3:
   .cfi_startproc
   pushl   %ebp
   .cfi_def_cfa_offset 8
   .cfi_offset 5, -8
   movl   %esp, %ebp
   .cfi_def_cfa_register 5
   andl   $-16, %esp
   subl   $32, %esp
   movl   $5, 24(%esp)
   movl   $6, 28(%esp)
   leal   28(%esp), %eax
   movl   %eax, 4(%esp)
   leal   24(%esp), %eax
   movl   %eax, (%esp)
   call   swap
   movl   28(%esp), %edx
   movl   24(%esp), %eax
   movl   %edx, 8(%esp)
   movl   %eax, 4(%esp)
   movl   $.LC0, (%esp)
   call   printf
   movl   $0, %eax
   leave
   .cfi_restore 5
   .cfi_def_cfa 4, 4
   ret
   .cfi_endproc
.LFE3:
   .size   main, .-main
   .ident   "GCC: (Ubuntu 4.8.2-19ubuntu1) 4.8.2"
   .section   .note.GNU-stack,"",@progbits

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