cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

check_lz.c (775B)

      1#include <stdio.h>
      2#include <stdlib.h>
      3#include <stdint.h>
      4#include "sys.h"
      5
      6static always_inline int cris_lz(int x)
      7{
      8	int r;
      9	asm ("lz\t%1, %0\n" : "=r" (r) : "r" (x));
     10	return r;
     11}
     12
     13void check_lz(void)
     14{
     15	int i;
     16
     17	if (cris_lz(0) != 32)
     18		err();
     19	if (cris_lz(1) != 31)
     20		err();
     21	if (cris_lz(2) != 30)
     22		err();
     23	if (cris_lz(4) != 29)
     24		err();
     25	if (cris_lz(8) != 28)
     26		err();
     27
     28	/* try all positions with a single bit.  */
     29	for (i = 1; i < 32; i++) {
     30		if (cris_lz(1 << (i-1)) != (32 - i))
     31			err();
     32	}
     33
     34	/* try all positions with all bits.  */
     35	for (i = 1; i < 32; i++) {
     36		/* split up this computation to clarify it.  */
     37		uint32_t val;
     38		val = (unsigned int)-1 >> (32 - i);
     39		if (cris_lz(val) != (32 - i))
     40			err();
     41	}
     42}
     43
     44int main(void)
     45{
     46	check_lz();
     47	pass();
     48	exit(0);
     49}