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시스템 프로그래밍 실습. ASSEMBLY 1. C 코드와 ASSEMBLY 코드의 상호 참조. EXAMPLE 1. ( c_source.c ) #include <stdio.h> #include <stdlib.h> int main(int argc, char* argv[]) { int num, exp, res; num = atoi(argv[1]); exp = atoi(argv[2]); num = myfunc(num, exp);
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시스템 프로그래밍 실습 ASSEMBLY 1
C 코드와 ASSEMBLY 코드의 상호 참조 EXAMPLE 1 ( c_source.c ) #include <stdio.h> #include <stdlib.h> int main(int argc, char* argv[]) { int num, exp, res; num = atoi(argv[1]); exp = atoi(argv[2]); num = myfunc(num, exp); printf(“%d exp %d = %d\n”, num, exp, res); return 0; } int print(int num, int exp, int res) { printf(“%d exp %d = %d\n”, num, exp, res); return 0; }
EXAMPLE 1 ( asm_source.s ) .globl myfunc myfunc: movl 4(%esp), %eax movl 8(%esp), %ebx movl $1, %ecx movl $1, %edx L1: cmpl %edx, %ebx je L2 imull %eax, %ecx pushl %ecx pushl %edx pushl %eax call print popl %eax popl %edx popl %ecx incl %edx jmp L1 L2: imull %eax, %ecx movl %ecx, %eax ret 컴파일 방법 gcc –o ex1 c_sources.c asm_source.s
INLINE ASSEMBLY EXAMPLE 2 ( c_source.c ) int iasm_test_func(int arg); void print(char* str, int num) { printf(“STRING : %s NUMBER : %d\n”, str, num); } static void __iasm_func_dummy(void) { __asm__ __volatile__( “.globl iasm_test_func \n\t” “iasm_test_func: \n\t” “pushl 4(%%esp) \n\t” “pushl %0 \n\t” “call print \n\t” “addl $8, %%esp \n\t” “movl 4(%%esp), %%eax \n\t” “ret “ : : “I” (“hello world..”) ); } int main() { int ret; ret = iasm_test_func(10); printf(“RETURN = %d\n”, ret); return 0; }
