| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdint.h> |
| |
| |
| // Note: The first instruction stands for ldr, which loads the data from |
| // memory to the specified register. Notice that due to the pipeline design, |
| // when ldr is executed, the program will be advanced by 8. So, to get our |
| // address we should substract it by 4. |
| |
| uint32_t stub[] = { |
| 0xe51ff004ul, // ldr pc, [pc, #-4] |
| 0x00000000ul // address |
| }; |
| |
| int test() { |
| printf("hello world!\n"); |
| return 5; |
| } |
| |
| int main() { |
| int (*f)() = (int (*)())stub; |
| stub[1] = (uint32_t)(uintptr_t)test; |
| |
| printf("return = %d\n", f()); |
| return EXIT_SUCCESS; |
| } |
