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Message-ID: <tip-a58e2ecd019d9ffb9f1813faf6151716fdecbae5@git.kernel.org>
Date: Mon, 21 Sep 2015 00:12:34 -0700
From: tip-bot for Denys Vlasenko <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: mingo@...nel.org, bp@...en8.de, hpa@...or.com,
peterz@...radead.org, brgerst@...il.com, luto@...capital.net,
shuahkh@....samsung.com, dvlasenk@...hat.com,
torvalds@...ux-foundation.org, tglx@...utronix.de,
linux-kernel@...r.kernel.org, keescook@...omium.org
Subject: [tip:x86/fpu] x86/fpu/math-emu, selftests:
Add test for FISTTP instructions
Commit-ID: a58e2ecd019d9ffb9f1813faf6151716fdecbae5
Gitweb: http://git.kernel.org/tip/a58e2ecd019d9ffb9f1813faf6151716fdecbae5
Author: Denys Vlasenko <dvlasenk@...hat.com>
AuthorDate: Sun, 20 Sep 2015 16:03:10 +0200
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 20 Sep 2015 16:19:01 +0200
x86/fpu/math-emu, selftests: Add test for FISTTP instructions
$ ./test_FISTTP_32
[RUN] Testing fisttp instructions
[OK] fisttp
Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Shuah Khan <shuahkh@....samsung.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-kernel@...r.kernel.org
Link: http://lkml.kernel.org/r/1442757790-27233-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
tools/testing/selftests/x86/Makefile | 2 +-
tools/testing/selftests/x86/test_FISTTP.c | 137 ++++++++++++++++++++++++++++++
2 files changed, 138 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
index c4c9b90..7145b3d 100644
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -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)
diff --git a/tools/testing/selftests/x86/test_FISTTP.c b/tools/testing/selftests/x86/test_FISTTP.c
new file mode 100644
index 0000000..b8e61a0
--- /dev/null
+++ b/tools/testing/selftests/x86/test_FISTTP.c
@@ -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;
+}
--
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