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

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

Signed-off-by: Denys 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: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Denys Vlasenko 2015-09-20 16:03:10 +02:00 committed by Ingo Molnar
parent 9a9d8642d0
commit a58e2ecd01
2 changed files with 138 additions and 1 deletions
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2
tools/testing/selftests/x86/Makefile
View file

@ -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)

137
tools/testing/selftests/x86/test_FISTTP.c Normal file
View file

@ -0,0 +1,137 @@
#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;
}