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authorLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 04:50:26 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2015-11-04 04:50:26 (GMT)
commitce4d72fac16a9540452957b526443b6080030bff (patch)
tree650abdc13edbc6150332c854a7467f06c2bf5ad9 /tools
parent0f25f2c1b18f7e47279ec2cf1d24c11c3108873b (diff)
parent158ecc39185b885420e5136b803b29be2bbec7fb (diff)
downloadlinux-ce4d72fac16a9540452957b526443b6080030bff.tar.xz
Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fpu changes from Ingo Molnar: "There are two main areas of changes: - Rework of the extended FPU state code to robustify the kernel's usage of cpuid provided xstate sizes - and related changes (Dave Hansen)" - math emulation enhancements: new modern FPU instructions support, with testcases, plus cleanups (Denys Vlasnko)" * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) x86/fpu: Fixup uninitialized feature_name warning x86/fpu/math-emu: Add support for FISTTP instructions x86/fpu/math-emu, selftests: Add test for FISTTP instructions x86/fpu/math-emu: Add support for FCMOVcc insns x86/fpu/math-emu: Add support for F[U]COMI[P] insns x86/fpu/math-emu: Remove define layer for undocumented opcodes x86/fpu/math-emu, selftests: Add tests for FCMOV and FCOMI insns x86/fpu/math-emu: Remove !NO_UNDOC_CODE x86/fpu: Check CPU-provided sizes against struct declarations x86/fpu: Check to ensure increasing-offset xstate offsets x86/fpu: Correct and check XSAVE xstate size calculations x86/fpu: Add C structures for AVX-512 state components x86/fpu: Rework YMM definition x86/fpu/mpx: Rework MPX 'xstate' types x86/fpu: Add xfeature_enabled() helper instead of test_bit() x86/fpu: Remove 'xfeature_nr' x86/fpu: Rework XSTATE_* macros to remove magic '2' x86/fpu: Rename XFEATURES_NR_MAX x86/fpu: Rename XSAVE macros x86/fpu: Remove partial LWP support definitions ...
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/x86/Makefile5
-rw-r--r--tools/testing/selftests/x86/test_FCMOV.c93
-rw-r--r--tools/testing/selftests/x86/test_FCOMI.c331
-rw-r--r--tools/testing/selftests/x86/test_FISTTP.c137
4 files changed, 564 insertions, 2 deletions
diff --git a/tools/testing/selftests/x86/Makefile b/tools/testing/selftests/x86/Makefile
index 389701f..eabcff4 100644
--- a/tools/testing/selftests/x86/Makefile
+++ b/tools/testing/selftests/x86/Makefile
@@ -5,7 +5,8 @@ include ../lib.mk
.PHONY: all all_32 all_64 warn_32bit_failure clean
TARGETS_C_BOTHBITS := single_step_syscall sysret_ss_attrs ldt_gdt syscall_nt ptrace_syscall
-TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault sigreturn test_syscall_vdso unwind_vdso
+TARGETS_C_32BIT_ONLY := entry_from_vm86 syscall_arg_fault sigreturn test_syscall_vdso unwind_vdso \
+ test_FCMOV test_FCOMI test_FISTTP
TARGETS_C_32BIT_ALL := $(TARGETS_C_BOTHBITS) $(TARGETS_C_32BIT_ONLY)
BINARIES_32 := $(TARGETS_C_32BIT_ALL:%=%_32)
@@ -35,7 +36,7 @@ clean:
$(RM) $(BINARIES_32) $(BINARIES_64)
$(TARGETS_C_32BIT_ALL:%=%_32): %_32: %.c
- $(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
+ $(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl -lm
$(TARGETS_C_BOTHBITS:%=%_64): %_64: %.c
$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
diff --git a/tools/testing/selftests/x86/test_FCMOV.c b/tools/testing/selftests/x86/test_FCMOV.c
new file mode 100644
index 0000000..4adcca0
--- /dev/null
+++ b/tools/testing/selftests/x86/test_FCMOV.c
@@ -0,0 +1,93 @@
+#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>
+
+#define TEST(insn) \
+long double __attribute__((noinline)) insn(long flags) \
+{ \
+ long double out; \
+ asm ("\n" \
+ " push %1""\n" \
+ " popf""\n" \
+ " fldpi""\n" \
+ " fld1""\n" \
+ " " #insn " %%st(1), %%st" "\n" \
+ " ffree %%st(1)" "\n" \
+ : "=t" (out) \
+ : "r" (flags) \
+ ); \
+ return out; \
+}
+
+TEST(fcmovb)
+TEST(fcmove)
+TEST(fcmovbe)
+TEST(fcmovu)
+TEST(fcmovnb)
+TEST(fcmovne)
+TEST(fcmovnbe)
+TEST(fcmovnu)
+
+enum {
+ CF = 1 << 0,
+ PF = 1 << 2,
+ ZF = 1 << 6,
+};
+
+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 fcomi 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 fcmovCC instructions\n");
+ /* If fcmovCC() returns 1.0, the move wasn't done */
+ err |= !(fcmovb(0) == 1.0); err |= !(fcmovnb(0) != 1.0);
+ err |= !(fcmove(0) == 1.0); err |= !(fcmovne(0) != 1.0);
+ err |= !(fcmovbe(0) == 1.0); err |= !(fcmovnbe(0) != 1.0);
+ err |= !(fcmovu(0) == 1.0); err |= !(fcmovnu(0) != 1.0);
+
+ err |= !(fcmovb(CF) != 1.0); err |= !(fcmovnb(CF) == 1.0);
+ err |= !(fcmove(CF) == 1.0); err |= !(fcmovne(CF) != 1.0);
+ err |= !(fcmovbe(CF) != 1.0); err |= !(fcmovnbe(CF) == 1.0);
+ err |= !(fcmovu(CF) == 1.0); err |= !(fcmovnu(CF) != 1.0);
+
+ err |= !(fcmovb(ZF) == 1.0); err |= !(fcmovnb(ZF) != 1.0);
+ err |= !(fcmove(ZF) != 1.0); err |= !(fcmovne(ZF) == 1.0);
+ err |= !(fcmovbe(ZF) != 1.0); err |= !(fcmovnbe(ZF) == 1.0);
+ err |= !(fcmovu(ZF) == 1.0); err |= !(fcmovnu(ZF) != 1.0);
+
+ err |= !(fcmovb(PF) == 1.0); err |= !(fcmovnb(PF) != 1.0);
+ err |= !(fcmove(PF) == 1.0); err |= !(fcmovne(PF) != 1.0);
+ err |= !(fcmovbe(PF) == 1.0); err |= !(fcmovnbe(PF) != 1.0);
+ err |= !(fcmovu(PF) != 1.0); err |= !(fcmovnu(PF) == 1.0);
+
+ if (!err)
+ printf("[OK]\tfcmovCC\n");
+ else
+ printf("[FAIL]\tfcmovCC errors: %d\n", err);
+
+ return err;
+}
diff --git a/tools/testing/selftests/x86/test_FCOMI.c b/tools/testing/selftests/x86/test_FCOMI.c
new file mode 100644
index 0000000..db4933e
--- /dev/null
+++ b/tools/testing/selftests/x86/test_FCOMI.c
@@ -0,0 +1,331 @@
+#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>
+
+enum {
+ CF = 1 << 0,
+ PF = 1 << 2,
+ ZF = 1 << 6,
+ ARITH = CF | PF | ZF,
+};
+
+long res_fcomi_pi_1;
+long res_fcomi_1_pi;
+long res_fcomi_1_1;
+long res_fcomi_nan_1;
+/* sNaN is s|111 1111 1|1xx xxxx xxxx xxxx xxxx xxxx */
+/* qNaN is s|111 1111 1|0xx xxxx xxxx xxxx xxxx xxxx (some x must be nonzero) */
+int snan = 0x7fc11111;
+int qnan = 0x7f811111;
+unsigned short snan1[5];
+/* sNaN80 is s|111 1111 1111 1111 |10xx xx...xx (some x must be nonzero) */
+unsigned short snan80[5] = { 0x1111, 0x1111, 0x1111, 0x8111, 0x7fff };
+
+int test(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fldpi""\n"
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_pi""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fldpi""\n"
+ " fld1""\n"
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_pi_1""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fld1""\n"
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_1_pi & ARITH) != (0)) {
+ printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
+ return 1;
+ }
+ if ((res_fcomi_pi_1 & ARITH) != (CF)) {
+ printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
+ return 1;
+ }
+ if ((res_fcomi_1_1 & ARITH) != (ZF)) {
+ printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int test_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fcomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != FE_INVALID) {
+ printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testu_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fucomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testu_snan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+// " flds snan""\n" // WRONG, this will convert 32-bit fp snan to a *qnan* in 80-bit fp register!
+// " fstpt snan1""\n" // if uncommented, it prints "snan1:7fff c111 1100 0000 0000" - c111, not 8111!
+// " fnclex""\n" // flds of a snan raised FE_INVALID, clear it
+ " fldt snan80""\n" // fldt never raise FE_INVALID
+ " fld1""\n"
+ " fucomi %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " ffree %%st(1)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+// printf("snan:%x snan1:%04x %04x %04x %04x %04x\n", snan, snan1[4], snan1[3], snan1[2], snan1[1], snan1[0]);
+ if (fetestexcept(FE_INVALID) != FE_INVALID) {
+ printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testp(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fldpi""\n"
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_pi""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fldpi""\n"
+ " fld1""\n"
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_pi_1""\n"
+
+ " push %0""\n"
+ " popf""\n"
+ " fld1""\n"
+ " fld1""\n"
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_1_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_1_pi & ARITH) != (0)) {
+ printf("[BAD]\tfcomi_1_pi with flags:%lx\n", flags);
+ return 1;
+ }
+ if ((res_fcomi_pi_1 & ARITH) != (CF)) {
+ printf("[BAD]\tfcomi_pi_1 with flags:%lx->%lx\n", flags, res_fcomi_pi_1 & ARITH);
+ return 1;
+ }
+ if ((res_fcomi_1_1 & ARITH) != (ZF)) {
+ printf("[BAD]\tfcomi_1_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testp_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fcomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != FE_INVALID) {
+ printf("[BAD]\tFE_INVALID is not set in %s\n", __func__);
+ return 1;
+ }
+ return 0;
+}
+
+int testup_qnan(long flags)
+{
+ feclearexcept(FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW);
+
+ asm ("\n"
+ " push %0""\n"
+ " popf""\n"
+ " flds qnan""\n"
+ " fld1""\n"
+ " fnclex""\n" // fld of a qnan raised FE_INVALID, clear it
+ " fucomip %%st(1), %%st" "\n"
+ " ffree %%st(0)" "\n"
+ " pushf""\n"
+ " pop res_fcomi_nan_1""\n"
+ :
+ : "r" (flags)
+ );
+ if ((res_fcomi_nan_1 & ARITH) != (ZF|CF|PF)) {
+ printf("[BAD]\tfcomi_qnan_1 with flags:%lx\n", flags);
+ return 1;
+ }
+ if (fetestexcept(FE_INVALID) != 0) {
+ printf("[BAD]\tFE_INVALID is set in %s\n", __func__);
+ 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 fcomi 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 f[u]comi[p] instructions\n");
+ err |= test(0);
+ err |= test_qnan(0);
+ err |= testu_qnan(0);
+ err |= testu_snan(0);
+ err |= test(CF|ZF|PF);
+ err |= test_qnan(CF|ZF|PF);
+ err |= testu_qnan(CF|ZF|PF);
+ err |= testu_snan(CF|ZF|PF);
+ err |= testp(0);
+ err |= testp_qnan(0);
+ err |= testup_qnan(0);
+ err |= testp(CF|ZF|PF);
+ err |= testp_qnan(CF|ZF|PF);
+ err |= testup_qnan(CF|ZF|PF);
+ if (!err)
+ printf("[OK]\tf[u]comi[p]\n");
+ else
+ printf("[FAIL]\tf[u]comi[p] errors: %d\n", err);
+
+ return err;
+}
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;
+}