static stakumilo_t
generate_push_pop (void)
{
static const char msg[] = "we got %i\n";
stakumilo_t result;
int arg;
int retval;
buffer = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (buffer == MAP_FAILED) {
perror("mmap");
exit(0);
}
result = (stakumilo_t)(jit_set_ip (buffer).ptr);
jit_prolog (1);
arg = jit_arg_i ();
jit_getarg_i (JIT_R1, arg);
/* Save R1 on the stack. */
jit_pushr_i (JIT_R1);
/* Save two other registers just for the sake of using the stack. */
jit_movi_i (JIT_R0, -1);
jit_movi_i (JIT_R2, -1);
jit_pushr_i (JIT_R0);
jit_pushr_i (JIT_R2);
/* most likely need stack aligned at 16 bytes, dummy push to force align */
jit_pushr_i (JIT_R2);
jit_movr_i (JIT_R0, JIT_R1);
jit_movi_p (JIT_R1, msg);
/* Invoke a function that may modify R1. */
jit_prepare (2);
jit_pusharg_i (JIT_R0);
jit_pusharg_p (JIT_R1);
(void)jit_finish (display_message);
/* dummy pop for the sake of calling function with 16 byte aligned stack */
jit_popr_i (JIT_R2);
/* Restore the dummy registers. */
jit_popr_i (JIT_R2);
jit_popr_i (JIT_R0);
/* Restore R1. */
jit_popr_i (JIT_R1);
jit_movr_i (JIT_RET, JIT_R1);
jit_ret ();
jit_flush_code (buffer, jit_get_ip ().ptr);
return result;
}
static stakumilo_t
generate_push_pop (void)
{
static const char msg[] = "we got %i\n";
static char buffer[1024];
stakumilo_t result;
int arg;
result = (stakumilo_t)(jit_set_ip (buffer).ptr);
jit_prolog (1);
arg = jit_arg_i ();
jit_getarg_i (JIT_R1, arg);
/* Save R1 on the stack. */
jit_pushr_i (JIT_R1);
/* Save two other registers just for the sake of using the stack. */
jit_movi_i (JIT_R0, -1);
jit_movi_i (JIT_R2, -1);
jit_pushr_i (JIT_R0);
jit_pushr_i (JIT_R2);
jit_movr_i (JIT_R0, JIT_R1);
jit_movi_p (JIT_R1, msg);
/* Invoke a function that may modify R1. */
jit_prepare (2);
jit_pusharg_i (JIT_R0);
jit_pusharg_p (JIT_R1);
(void)jit_finish (display_message);
/* Restore the dummy registers. */
jit_popr_i (JIT_R2);
jit_popr_i (JIT_R0);
/* Restore R1. */
jit_popr_i (JIT_R1);
jit_movr_i (JIT_RET, JIT_R1);
jit_ret ();
jit_flush_code (buffer, jit_get_ip ().ptr);
return result;
}
