diff options
| -rw-r--r-- | subhook_x86.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/subhook_x86.c b/subhook_x86.c index 909e900..549225c 100644 --- a/subhook_x86.c +++ b/subhook_x86.c @@ -50,6 +50,7 @@ #include <stdint.h> #endif +#define ABS(x) ((x) > 0 ? (x) : (-(x))) #define MAX_INSN_LEN 15 /* maximum length of x86 instruction */ #define JMP_OPCODE 0xE9 @@ -280,16 +281,15 @@ static int subhook_make_jmp32(void *src, void *dst) { struct subhook_jmp32 *jmp = (struct subhook_jmp32 *)src; intptr_t src_addr = (intptr_t)src; intptr_t dst_addr = (intptr_t)dst; - int64_t distance; +#ifdef SUBHOOK_X86_64 + int64_t distance = ABS(src_addr - dst_addr); +#endif - if (src_addr > dst_addr) { - distance = src_addr - dst_addr; - } else { - distance = dst_addr - src_addr; - } +#ifdef SUBHOOK_X86_64 if (distance < INT32_MIN || distance > INT32_MAX) { return -EOVERFLOW; } +#endif jmp->opcode = JMP_OPCODE; jmp->offset = (int32_t)(dst_addr - (src_addr + sizeof(*jmp))); |