/* * Simple test of (un)protecting a code buffer. */ #include #include #include #define MARKER 10 int main(int argc, char *argv[]) { jit_state_t *_jit; jit_node_t *load, *label, *ok; unsigned char *ptr; void (*function)(void); int mmap_prot, mmap_flags; init_jit(argv[0]); _jit = jit_new_state(); jit_prolog(); load = jit_movi(JIT_R0, 0); jit_ldr_c(JIT_R0, JIT_R0); ok = jit_forward(); jit_patch_at(jit_beqi(JIT_R0, MARKER), ok); jit_prepare(); jit_pushargi(1); jit_finishi(exit); label = jit_indirect(); jit_skip(1); /* Reserves enough space for a byte. */ jit_patch_at(load, label); jit_link(ok); jit_prepare(); jit_pushargi((jit_word_t)"%s\n"); jit_ellipsis(); jit_pushargi((jit_word_t)"ok"); jit_finishi(printf); function = jit_emit(); if (function == NULL) abort(); jit_unprotect (); ptr = jit_address (label); *ptr = MARKER; jit_protect (); jit_clear_state(); (*function)(); jit_destroy_state(); finish_jit(); return (0); }