x86 32bits c && asm helloworld

原创于 2024-03-22 08:01:41 发布 · 1.1k 阅读

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CC 4.0 BY-SA版权

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#linux #运维 #服务器

该博客展示了Linux环境下汇编语言与C语言的混合编程代码。包含了汇编代码的编写、C代码的实现，以及两者的编译和链接过程，还涉及CRC表的定义和内存操作等内容，为相关开发提供了示例。

helloworld: helloworld.o main.o
   gcc -m32 -no-pie helloworld.o main.o -o helloworld
#   ld -m elf_i386 -s -o helloworld helloworld.o main.o
helloworld.o:helloworld.asm
#   nasm -f elf64 -o helloworld.o helloworld.asm
   nasm -f elf32 -o helloworld.o helloworld32.asm
main.o:main.c
   gcc -m32 -c main.c -o main.o
clean:
   rm -f main.o helloworld helloworld.o

section .data
msg db "asm hello, world",0x0a
len equ $-msg

s_crctablexxx db 'Some string'

section .text

;https://blog.youkuaiyun.com/m0_55368674/article/details/128671914

extern macdbg_dmphex
extern s_crctable
extern g_debug_buff
global _start_asm
_start_asm:
push ebp
mov ebp, esp

   push ebx
mov eax,4
mov ebx,1
mov ecx, msg
mov edx, len
int 0x80

   ;mov esi, g_debug_buff
   ;mov [edx,esi], 0x1234

   mov eax, g_debug_buff
   mov Dword [eax+0], 0x12345678
mov word [eax+4], 0x12345678
   mov byte [eax+8], 0x12345678

nop
   nop
   pop ebx
   mov eax, ebp
   ;leave
   mov esp, ebp
   pop ebp
   retn

global inst_test
inst_test:
mov ax, 0x08
   mov dx, 0x84 ;1000 0000
   ;lea eax, [rdx-4]
shr eax, 2
retn

; align 4

;rdi rsi rdx rcx r8 r9
; =============== S U B R O U T I N E =======================================
;public GetCRC32
global GetCRC32
GetCRC32:

retn

#include <stdio.h>
#include <string.h>

extern int _start_asm();

unsigned char crc_buff[64] = {0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07};

extern unsigned int GetCRC32(unsigned char *,unsigned char *,int len);

extern unsigned int inst_test(void);
int macdbg_dmphex( const char* buff, int len );

void my_memset(char *dest, int value, int cnt)
{
   int i;
   for(i=0x00;i<cnt;i++){
       dest[i] = value;
   }
}
unsigned int g_debug_buff[64];
int main()
{
unsigned char buff[64];
unsigned int ret;
   int a = 14, b = 15;

   __asm__("nop");
   g_debug_buff[4]=0x87654321;
printf("c main.\n");
   my_memset( buff, 0x55, sizeof(buff) );
   macdbg_dmphex(buff, 0x20);

   __asm__ __volatile__("movl %%esp, %%eax \n\t"
"movl %%eax, %0 \n\t"
:"=g"(a) /* 输出 */
: /* 输入 */
); /* 不受影响的寄存器 */
printf("Result: %#x, %#x \n", a, b);

ret = _start_asm();
printf("c helxxx = %#x\n", ret);

   ret = inst_test();
   printf("inst_test = %#x\n", ret);
macdbg_dmphex(g_debug_buff, 0x20);
return 0;
}

int macdbg_dmphex( const char* buff, int len )
{
int retval = 0;
int x, y, tot, lineoff;
const char* curr;
lineoff = 0;
curr = buff;
tot = 0;

printf( "buff = %p\n", buff );
for( x = 0; len > x+16; ){
printf("0x%08x: ", lineoff);
for( y = 0; y < 16; y++ ){
printf("%02x ", (unsigned char)*(curr + y));
}
printf(" ");
for( y = 0; y < 16; y++ ){
char c;
c = *(curr + y);
if( c > 31 && c < 127 ){
printf("%c", c);
}else{
printf("%c", '.');
}
tot++;
}
curr += 16;
x += 16;
lineoff += 16;
       printf("\n");
}

//do last line
if( tot < len ){
curr = (buff + tot);
printf("0x%08x: ", lineoff);
for( y = 0; y < (len - tot); y++ ){
printf("%02x ", (unsigned char)*(curr + y));
}
//padding with spaces
//Ser_Printf("(len - tot) %d.\r\n", (len - tot) );
if( (len - tot) < 16 ){
for( y = 0; y < (32 - ((len - tot)*2)); y++ ){
printf(" ");
}
}
for( y = 0; y < 16-(len - tot); y++ ){
printf(" ");
}
printf(" ");
//Ser_Printf("(len - tot) %d.\r\n", (len - tot) );
for( y = 0; y < (len - tot); y++ ){
char c;
c = *(curr + y);
if( c >31 && c < 127 ){
printf("%c", c);
}else{
printf("%c", '.');
}
}
}
printf("\n");
return retval;
}

/* 未命名1 (2024/3/18 14:33:34)
起始位置(h): 00000000, 结束位置(h): 000003FF, 长度(h): 00000400 */

unsigned char s_crctable[1024] = {
   0x00, 0x00, 0x00, 0x00, 0x96, 0x30, 0x07, 0x77, 0x2C, 0x61, 0x0E, 0xEE,
   0xBA, 0x51, 0x09, 0x99, 0x19, 0xC4, 0x6D, 0x07, 0x8F, 0xF4, 0x6A, 0x70,
   0x35, 0xA5, 0x63, 0xE9, 0xA3, 0x95, 0x64, 0x9E, 0x32, 0x88, 0xDB, 0x0E,
   0xA4, 0xB8, 0xDC, 0x79, 0x1E, 0xE9, 0xD5, 0xE0, 0x88, 0xD9, 0xD2, 0x97,
   0x2B, 0x4C, 0xB6, 0x09, 0xBD, 0x7C, 0xB1, 0x7E, 0x07, 0x2D, 0xB8, 0xE7,
   0x91, 0x1D, 0xBF, 0x90, 0x64, 0x10, 0xB7, 0x1D, 0xF2, 0x20, 0xB0, 0x6A,
   0x48, 0x71, 0xB9, 0xF3, 0xDE, 0x41, 0xBE, 0x84, 0x7D, 0xD4, 0xDA, 0x1A,
   0xEB, 0xE4, 0xDD, 0x6D, 0x51, 0xB5, 0xD4, 0xF4, 0xC7, 0x85, 0xD3, 0x83,
   0x56, 0x98, 0x6C, 0x13, 0xC0, 0xA8, 0x6B, 0x64, 0x7A, 0xF9, 0x62, 0xFD,
   0xEC, 0xC9, 0x65, 0x8A, 0x4F, 0x5C, 0x01, 0x14, 0xD9, 0x6C, 0x06, 0x63,
   0x63, 0x3D, 0x0F, 0xFA, 0xF5, 0x0D, 0x08, 0x8D, 0xC8, 0x20, 0x6E, 0x3B,
   0x5E, 0x10, 0x69, 0x4C, 0xE4, 0x41, 0x60, 0xD5, 0x72, 0x71, 0x67, 0xA2,
   0xD1, 0xE4, 0x03, 0x3C, 0x47, 0xD4, 0x04, 0x4B, 0xFD, 0x85, 0x0D, 0xD2,
   0x6B, 0xB5, 0x0A, 0xA5, 0xFA, 0xA8, 0xB5, 0x35, 0x6C, 0x98, 0xB2, 0x42,
   0xD6, 0xC9, 0xBB, 0xDB, 0x40, 0xF9, 0xBC, 0xAC, 0xE3, 0x6C, 0xD8, 0x32,
   0x75, 0x5C, 0xDF, 0x45, 0xCF, 0x0D, 0xD6, 0xDC, 0x59, 0x3D, 0xD1, 0xAB,
   0xAC, 0x30, 0xD9, 0x26, 0x3A, 0x00, 0xDE, 0x51, 0x80, 0x51, 0xD7, 0xC8,
   0x16, 0x61, 0xD0, 0xBF, 0xB5, 0xF4, 0xB4, 0x21, 0x23, 0xC4, 0xB3, 0x56,
   0x99, 0x95, 0xBA, 0xCF, 0x0F, 0xA5, 0xBD, 0xB8, 0x9E, 0xB8, 0x02, 0x28,
   0x08, 0x88, 0x05, 0x5F, 0xB2, 0xD9, 0x0C, 0xC6, 0x24, 0xE9, 0x0B, 0xB1,
   0x87, 0x7C, 0x6F, 0x2F, 0x11, 0x4C, 0x68, 0x58, 0xAB, 0x1D, 0x61, 0xC1,
   0x3D, 0x2D, 0x66, 0xB6, 0x90, 0x41, 0xDC, 0x76, 0x06, 0x71, 0xDB, 0x01,
   0xBC, 0x20, 0xD2, 0x98, 0x2A, 0x10, 0xD5, 0xEF, 0x89, 0x85, 0xB1, 0x71,
   0x1F, 0xB5, 0xB6, 0x06, 0xA5, 0xE4, 0xBF, 0x9F, 0x33, 0xD4, 0xB8, 0xE8,
   0xA2, 0xC9, 0x07, 0x78, 0x34, 0xF9, 0x00, 0x0F, 0x8E, 0xA8, 0x09, 0x96,
   0x18, 0x98, 0x0E, 0xE1, 0xBB, 0x0D, 0x6A, 0x7F, 0x2D, 0x3D, 0x6D, 0x08,
   0x97, 0x6C, 0x64, 0x91, 0x01, 0x5C, 0x63, 0xE6, 0xF4, 0x51, 0x6B, 0x6B,
   0x62, 0x61, 0x6C, 0x1C, 0xD8, 0x30, 0x65, 0x85, 0x4E, 0x00, 0x62, 0xF2,
   0xED, 0x95, 0x06, 0x6C, 0x7B, 0xA5, 0x01, 0x1B, 0xC1, 0xF4, 0x08, 0x82,
   0x57, 0xC4, 0x0F, 0xF5, 0xC6, 0xD9, 0xB0, 0x65, 0x50, 0xE9, 0xB7, 0x12,
   0xEA, 0xB8, 0xBE, 0x8B, 0x7C, 0x88, 0xB9, 0xFC, 0xDF, 0x1D, 0xDD, 0x62,
   0x49, 0x2D, 0xDA, 0x15, 0xF3, 0x7C, 0xD3, 0x8C, 0x65, 0x4C, 0xD4, 0xFB,
   0x58, 0x61, 0xB2, 0x4D, 0xCE, 0x51, 0xB5, 0x3A, 0x74, 0x00, 0xBC, 0xA3,
   0xE2, 0x30, 0xBB, 0xD4, 0x41, 0xA5, 0xDF, 0x4A, 0xD7, 0x95, 0xD8, 0x3D,
   0x6D, 0xC4, 0xD1, 0xA4, 0xFB, 0xF4, 0xD6, 0xD3, 0x6A, 0xE9, 0x69, 0x43,
   0xFC, 0xD9, 0x6E, 0x34, 0x46, 0x88, 0x67, 0xAD, 0xD0, 0xB8, 0x60, 0xDA,
   0x73, 0x2D, 0x04, 0x44, 0xE5, 0x1D, 0x03, 0x33, 0x5F, 0x4C, 0x0A, 0xAA,
   0xC9, 0x7C, 0x0D, 0xDD, 0x3C, 0x71, 0x05, 0x50, 0xAA, 0x41, 0x02, 0x27,
   0x10, 0x10, 0x0B, 0xBE, 0x86, 0x20, 0x0C, 0xC9, 0x25, 0xB5, 0x68, 0x57,
   0xB3, 0x85, 0x6F, 0x20, 0x09, 0xD4, 0x66, 0xB9, 0x9F, 0xE4, 0x61, 0xCE,
   0x0E, 0xF9, 0xDE, 0x5E, 0x98, 0xC9, 0xD9, 0x29, 0x22, 0x98, 0xD0, 0xB0,
   0xB4, 0xA8, 0xD7, 0xC7, 0x17, 0x3D, 0xB3, 0x59, 0x81, 0x0D, 0xB4, 0x2E,
   0x3B, 0x5C, 0xBD, 0xB7, 0xAD, 0x6C, 0xBA, 0xC0, 0x20, 0x83, 0xB8, 0xED,
   0xB6, 0xB3, 0xBF, 0x9A, 0x0C, 0xE2, 0xB6, 0x03, 0x9A, 0xD2, 0xB1, 0x74,
   0x39, 0x47, 0xD5, 0xEA, 0xAF, 0x77, 0xD2, 0x9D, 0x15, 0x26, 0xDB, 0x04,
   0x83, 0x16, 0xDC, 0x73, 0x12, 0x0B, 0x63, 0xE3, 0x84, 0x3B, 0x64, 0x94,
   0x3E, 0x6A, 0x6D, 0x0D, 0xA8, 0x5A, 0x6A, 0x7A, 0x0B, 0xCF, 0x0E, 0xE4,
   0x9D, 0xFF, 0x09, 0x93, 0x27, 0xAE, 0x00, 0x0A, 0xB1, 0x9E, 0x07, 0x7D,
   0x44, 0x93, 0x0F, 0xF0, 0xD2, 0xA3, 0x08, 0x87, 0x68, 0xF2, 0x01, 0x1E,
   0xFE, 0xC2, 0x06, 0x69, 0x5D, 0x57, 0x62, 0xF7, 0xCB, 0x67, 0x65, 0x80,
   0x71, 0x36, 0x6C, 0x19, 0xE7, 0x06, 0x6B, 0x6E, 0x76, 0x1B, 0xD4, 0xFE,
   0xE0, 0x2B, 0xD3, 0x89, 0x5A, 0x7A, 0xDA, 0x10, 0xCC, 0x4A, 0xDD, 0x67,
   0x6F, 0xDF, 0xB9, 0xF9, 0xF9, 0xEF, 0xBE, 0x8E, 0x43, 0xBE, 0xB7, 0x17,
   0xD5, 0x8E, 0xB0, 0x60, 0xE8, 0xA3, 0xD6, 0xD6, 0x7E, 0x93, 0xD1, 0xA1,
   0xC4, 0xC2, 0xD8, 0x38, 0x52, 0xF2, 0xDF, 0x4F, 0xF1, 0x67, 0xBB, 0xD1,
   0x67, 0x57, 0xBC, 0xA6, 0xDD, 0x06, 0xB5, 0x3F, 0x4B, 0x36, 0xB2, 0x48,
   0xDA, 0x2B, 0x0D, 0xD8, 0x4C, 0x1B, 0x0A, 0xAF, 0xF6, 0x4A, 0x03, 0x36,
   0x60, 0x7A, 0x04, 0x41, 0xC3, 0xEF, 0x60, 0xDF, 0x55, 0xDF, 0x67, 0xA8,
   0xEF, 0x8E, 0x6E, 0x31, 0x79, 0xBE, 0x69, 0x46, 0x8C, 0xB3, 0x61, 0xCB,
   0x1A, 0x83, 0x66, 0xBC, 0xA0, 0xD2, 0x6F, 0x25, 0x36, 0xE2, 0x68, 0x52,
   0x95, 0x77, 0x0C, 0xCC, 0x03, 0x47, 0x0B, 0xBB, 0xB9, 0x16, 0x02, 0x22,
   0x2F, 0x26, 0x05, 0x55, 0xBE, 0x3B, 0xBA, 0xC5, 0x28, 0x0B, 0xBD, 0xB2,
   0x92, 0x5A, 0xB4, 0x2B, 0x04, 0x6A, 0xB3, 0x5C, 0xA7, 0xFF, 0xD7, 0xC2,
   0x31, 0xCF, 0xD0, 0xB5, 0x8B, 0x9E, 0xD9, 0x2C, 0x1D, 0xAE, 0xDE, 0x5B,
   0xB0, 0xC2, 0x64, 0x9B, 0x26, 0xF2, 0x63, 0xEC, 0x9C, 0xA3, 0x6A, 0x75,
   0x0A, 0x93, 0x6D, 0x02, 0xA9, 0x06, 0x09, 0x9C, 0x3F, 0x36, 0x0E, 0xEB,
   0x85, 0x67, 0x07, 0x72, 0x13, 0x57, 0x00, 0x05, 0x82, 0x4A, 0xBF, 0x95,
   0x14, 0x7A, 0xB8, 0xE2, 0xAE, 0x2B, 0xB1, 0x7B, 0x38, 0x1B, 0xB6, 0x0C,
   0x9B, 0x8E, 0xD2, 0x92, 0x0D, 0xBE, 0xD5, 0xE5, 0xB7, 0xEF, 0xDC, 0x7C,
   0x21, 0xDF, 0xDB, 0x0B, 0xD4, 0xD2, 0xD3, 0x86, 0x42, 0xE2, 0xD4, 0xF1,
   0xF8, 0xB3, 0xDD, 0x68, 0x6E, 0x83, 0xDA, 0x1F, 0xCD, 0x16, 0xBE, 0x81,
   0x5B, 0x26, 0xB9, 0xF6, 0xE1, 0x77, 0xB0, 0x6F, 0x77, 0x47, 0xB7, 0x18,
   0xE6, 0x5A, 0x08, 0x88, 0x70, 0x6A, 0x0F, 0xFF, 0xCA, 0x3B, 0x06, 0x66,
   0x5C, 0x0B, 0x01, 0x11, 0xFF, 0x9E, 0x65, 0x8F, 0x69, 0xAE, 0x62, 0xF8,
   0xD3, 0xFF, 0x6B, 0x61, 0x45, 0xCF, 0x6C, 0x16, 0x78, 0xE2, 0x0A, 0xA0,
   0xEE, 0xD2, 0x0D, 0xD7, 0x54, 0x83, 0x04, 0x4E, 0xC2, 0xB3, 0x03, 0x39,
   0x61, 0x26, 0x67, 0xA7, 0xF7, 0x16, 0x60, 0xD0, 0x4D, 0x47, 0x69, 0x49,
   0xDB, 0x77, 0x6E, 0x3E, 0x4A, 0x6A, 0xD1, 0xAE, 0xDC, 0x5A, 0xD6, 0xD9,
   0x66, 0x0B, 0xDF, 0x40, 0xF0, 0x3B, 0xD8, 0x37, 0x53, 0xAE, 0xBC, 0xA9,
   0xC5, 0x9E, 0xBB, 0xDE, 0x7F, 0xCF, 0xB2, 0x47, 0xE9, 0xFF, 0xB5, 0x30,
   0x1C, 0xF2, 0xBD, 0xBD, 0x8A, 0xC2, 0xBA, 0xCA, 0x30, 0x93, 0xB3, 0x53,
   0xA6, 0xA3, 0xB4, 0x24, 0x05, 0x36, 0xD0, 0xBA, 0x93, 0x06, 0xD7, 0xCD,
   0x29, 0x57, 0xDE, 0x54, 0xBF, 0x67, 0xD9, 0x23, 0x2E, 0x7A, 0x66, 0xB3,
   0xB8, 0x4A, 0x61, 0xC4, 0x02, 0x1B, 0x68, 0x5D, 0x94, 0x2B, 0x6F, 0x2A,
   0x37, 0xBE, 0x0B, 0xB4, 0xA1, 0x8E, 0x0C, 0xC3, 0x1B, 0xDF, 0x05, 0x5A,
   0x8D, 0xEF, 0x02, 0x2D
};