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Commit a58e2ecd authored by Denys Vlasenko's avatar Denys Vlasenko Committed by Ingo Molnar
Browse files

x86/fpu/math-emu, selftests: Add test for FISTTP instructions 



  $ ./test_FISTTP_32
  [RUN]	Testing fisttp instructions
  [OK]	fisttp

Signed-off-by: default avatarDenys Vlasenko <dvlasenk@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1442757790-27233-1-git-send-email-dvlasenk@redhat.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 9a9d8642

tools/testing/selftests/x86/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -6,7 +6,7 @@ include ../lib.mk 


TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs ldt_gdt syscall_nt

TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault sigreturn \

			test_FCMOV test_FCOMI

			test_FCMOV test_FCOMI test_FISTTP



TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY)

BINARIES_32 := $(TARGETS_C_32BIT_ALL:%=%_32)

tools/testing/selftests/x86/test_FISTTP.c

0 → 100644
+137 −0
Original line number Diff line number Diff line 
#undef _GNU_SOURCE

#define _GNU_SOURCE 1

#undef __USE_GNU

#define __USE_GNU 1

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <stdio.h>

#include <signal.h>

#include <sys/types.h>

#include <sys/select.h>

#include <sys/time.h>

#include <sys/wait.h>

#include <fenv.h>



unsigned long long res64 = -1;

unsigned int res32 = -1;

unsigned short res16 = -1;



int test(void)

{

	int ex;



	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm volatile ("\n"

	"	fld1""\n"

	"	fisttp	res16""\n"

	"	fld1""\n"

	"	fisttpl	res32""\n"

	"	fld1""\n"

	"	fisttpll res64""\n"

	: : : "memory"

	);

	if (res16 != 1 || res32 != 1 || res64 != 1) {

		printf("[BAD]\tfisttp 1\n");

		return 1;

	}

	ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	if (ex != 0) {

		printf("[BAD]\tfisttp 1: wrong exception state\n");

		return 1;

	}



	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm volatile ("\n"

	"	fldpi""\n"

	"	fisttp	res16""\n"

	"	fldpi""\n"

	"	fisttpl	res32""\n"

	"	fldpi""\n"

	"	fisttpll res64""\n"

	: : : "memory"

	);

	if (res16 != 3 || res32 != 3 || res64 != 3) {

		printf("[BAD]\tfisttp pi\n");

		return 1;

	}

	ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	if (ex != FE_INEXACT) {

		printf("[BAD]\tfisttp pi: wrong exception state\n");

		return 1;

	}



	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm volatile ("\n"

	"	fldpi""\n"

	"	fchs""\n"

	"	fisttp	res16""\n"

	"	fldpi""\n"

	"	fchs""\n"

	"	fisttpl	res32""\n"

	"	fldpi""\n"

	"	fchs""\n"

	"	fisttpll res64""\n"

	: : : "memory"

	);

	if (res16 != 0xfffd || res32 != 0xfffffffd || res64 != 0xfffffffffffffffdULL) {

		printf("[BAD]\tfisttp -pi\n");

		return 1;

	}

	ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	if (ex != FE_INEXACT) {

		printf("[BAD]\tfisttp -pi: wrong exception state\n");

		return 1;

	}



	feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	asm volatile ("\n"

	"	fldln2""\n"

	"	fisttp	res16""\n"

	"	fldln2""\n"

	"	fisttpl	res32""\n"

	"	fldln2""\n"

	"	fisttpll res64""\n"

	: : : "memory"

	);

	/* Test truncation to zero (round-to-nearest would give 1 here) */

	if (res16 != 0 || res32 != 0 || res64 != 0) {

		printf("[BAD]\tfisttp ln2\n");

		return 1;

	}

	ex = fetestexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);

	if (ex != FE_INEXACT) {

		printf("[BAD]\tfisttp ln2: wrong exception state\n");

		return 1;

	}



	return 0;

}



void sighandler(int sig)

{

	printf("[FAIL]\tGot signal %d, exiting\n", sig);

	exit(1);

}



int main(int argc, char **argv, char **envp)

{

	int err = 0;



	/* SIGILL triggers on 32-bit kernels w/o fisttp emulation

	 * when run with "no387 nofxsr". Other signals are caught

	 * just in case.

	 */

	signal(SIGILL, sighandler);

	signal(SIGFPE, sighandler);

	signal(SIGSEGV, sighandler);



	printf("[RUN]\tTesting fisttp instructions\n");

	err |= test();

	if (!err)

		printf("[OK]\tfisttp\n");

	else

		printf("[FAIL]\tfisttp errors: %d\n", err);



	return err;

}