cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_FCMOV.c (2404B)

      1// SPDX-License-Identifier: GPL-2.0
      2#undef _GNU_SOURCE
      3#define _GNU_SOURCE 1
      4#undef __USE_GNU
      5#define __USE_GNU 1
      6#include <unistd.h>
      7#include <stdlib.h>
      8#include <string.h>
      9#include <stdio.h>
     10#include <signal.h>
     11#include <sys/types.h>
     12#include <sys/select.h>
     13#include <sys/time.h>
     14#include <sys/wait.h>
     15
     16#define TEST(insn) \
     17long double __attribute__((noinline)) insn(long flags) \
     18{						\
     19	long double out;			\
     20	asm ("\n"				\
     21	"	push	%1""\n"			\
     22	"	popf""\n"			\
     23	"	fldpi""\n"			\
     24	"	fld1""\n"			\
     25	"	" #insn " %%st(1), %%st" "\n"	\
     26	"	ffree	%%st(1)" "\n"		\
     27	: "=t" (out)				\
     28	: "r" (flags)				\
     29	);					\
     30	return out;				\
     31}
     32
     33TEST(fcmovb)
     34TEST(fcmove)
     35TEST(fcmovbe)
     36TEST(fcmovu)
     37TEST(fcmovnb)
     38TEST(fcmovne)
     39TEST(fcmovnbe)
     40TEST(fcmovnu)
     41
     42enum {
     43	CF = 1 << 0,
     44	PF = 1 << 2,
     45	ZF = 1 << 6,
     46};
     47
     48void sighandler(int sig)
     49{
     50	printf("[FAIL]\tGot signal %d, exiting\n", sig);
     51	exit(1);
     52}
     53
     54int main(int argc, char **argv, char **envp)
     55{
     56	int err = 0;
     57
     58	/* SIGILL triggers on 32-bit kernels w/o fcomi emulation
     59	 * when run with "no387 nofxsr". Other signals are caught
     60	 * just in case.
     61	 */
     62	signal(SIGILL, sighandler);
     63	signal(SIGFPE, sighandler);
     64	signal(SIGSEGV, sighandler);
     65
     66	printf("[RUN]\tTesting fcmovCC instructions\n");
     67	/* If fcmovCC() returns 1.0, the move wasn't done */
     68	err |= !(fcmovb(0)   == 1.0); err |= !(fcmovnb(0)  != 1.0);
     69	err |= !(fcmove(0)   == 1.0); err |= !(fcmovne(0)  != 1.0);
     70	err |= !(fcmovbe(0)  == 1.0); err |= !(fcmovnbe(0) != 1.0);
     71	err |= !(fcmovu(0)   == 1.0); err |= !(fcmovnu(0)  != 1.0);
     72
     73	err |= !(fcmovb(CF)  != 1.0); err |= !(fcmovnb(CF)  == 1.0);
     74	err |= !(fcmove(CF)  == 1.0); err |= !(fcmovne(CF)  != 1.0);
     75	err |= !(fcmovbe(CF) != 1.0); err |= !(fcmovnbe(CF) == 1.0);
     76	err |= !(fcmovu(CF)  == 1.0); err |= !(fcmovnu(CF)  != 1.0);
     77
     78	err |= !(fcmovb(ZF)  == 1.0); err |= !(fcmovnb(ZF)  != 1.0);
     79	err |= !(fcmove(ZF)  != 1.0); err |= !(fcmovne(ZF)  == 1.0);
     80	err |= !(fcmovbe(ZF) != 1.0); err |= !(fcmovnbe(ZF) == 1.0);
     81	err |= !(fcmovu(ZF)  == 1.0); err |= !(fcmovnu(ZF)  != 1.0);
     82
     83	err |= !(fcmovb(PF)  == 1.0); err |= !(fcmovnb(PF)  != 1.0);
     84	err |= !(fcmove(PF)  == 1.0); err |= !(fcmovne(PF)  != 1.0);
     85	err |= !(fcmovbe(PF) == 1.0); err |= !(fcmovnbe(PF) != 1.0);
     86	err |= !(fcmovu(PF)  != 1.0); err |= !(fcmovnu(PF)  == 1.0);
     87
     88        if (!err)
     89                printf("[OK]\tfcmovCC\n");
     90	else
     91		printf("[FAIL]\tfcmovCC errors: %d\n", err);
     92
     93	return err;
     94}