@@ -36,6 +36,10 @@ BINARIES_64 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_64))
CFLAGS := -O2 -g -std=gnu99 -pthread -Wall $(KHDR_INCLUDES)
+LIB := helpers
+LIB_OBJ_32 := $(patsubst %,$(OUTPUT)/%.o,$(LIB:%=%_32))
+LIB_OBJ_64 := $(patsubst %,$(OUTPUT)/%.o,$(LIB:%=%_64))
+
# call32_from_64 in thunks.S uses absolute addresses.
ifeq ($(CAN_BUILD_WITH_NOPIE),1)
CFLAGS += -no-pie
@@ -69,12 +73,18 @@ all_32: $(BINARIES_32)
all_64: $(BINARIES_64)
-EXTRA_CLEAN := $(BINARIES_32) $(BINARIES_64)
+EXTRA_CLEAN := $(BINARIES_32) $(BINARIES_64) $(LIB_OBJ_32) $(LIB_OBJ_64)
+
+$(LIB_OBJ_32): $(OUTPUT)/%_32.o: %.c
+ $(CC) -O -m32 -o $@ -c $^ $(CFLAGS) $(EXTRA_CFLAGS)
+
+$(LIB_OBJ_64): $(OUTPUT)/%_64.o: %.c
+ $(CC) -O -m64 -o $@ -c $^ $(CFLAGS) $(EXTRA_CFLAGS)
-$(BINARIES_32): $(OUTPUT)/%_32: %.c helpers.h
+$(BINARIES_32): $(OUTPUT)/%_32: %.c helpers.h $(LIB_OBJ_32)
$(CC) -m32 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl -lm
-$(BINARIES_64): $(OUTPUT)/%_64: %.c helpers.h
+$(BINARIES_64): $(OUTPUT)/%_64: %.c helpers.h $(LIB_OBJ_64)
$(CC) -m64 -o $@ $(CFLAGS) $(EXTRA_CFLAGS) $^ -lrt -ldl
# x86_64 users should be encouraged to install 32-bit libraries
@@ -20,6 +20,7 @@
#include <sys/uio.h>
#include "../kselftest.h" /* For __cpuid_count() */
+#include "helpers.h"
#ifndef __x86_64__
# error This test is 64-bit only
@@ -61,30 +62,6 @@ static inline void xrstor(struct xsave_buffer *xbuf, uint64_t rfbm)
/* err() exits and will not return */
#define fatal_error(msg, ...) err(1, "[FAIL]\t" msg, ##__VA_ARGS__)
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- fatal_error("sigaction");
-}
-
-static void clearhandler(int sig)
-{
- struct sigaction sa;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- fatal_error("sigaction");
-}
-
#define XFEATURE_XTILECFG 17
#define XFEATURE_XTILEDATA 18
#define XFEATURE_MASK_XTILECFG (1 << XFEATURE_XTILECFG)
@@ -11,13 +11,13 @@
#include <stdio.h>
#include <string.h>
#include <sched.h>
-#include <signal.h>
#include <err.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/wait.h>
#include "../kselftest.h" /* For __cpuid_count() */
+#include "helpers.h"
static inline int xsave_enabled(void)
{
@@ -29,19 +29,6 @@ static inline int xsave_enabled(void)
return ecx & (1U << 27);
}
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static void sigusr1(int sig, siginfo_t *info, void *uc_void)
{
ucontext_t *uc = uc_void;
@@ -11,7 +11,6 @@
#include <assert.h>
#include <stdlib.h>
#include <sys/syscall.h>
-#include <sys/signal.h>
#include <sys/ucontext.h>
#include <unistd.h>
#include <stdio.h>
@@ -24,31 +23,11 @@
#include <errno.h>
#include <sys/vm86.h>
+#include "helpers.h"
+
static unsigned long load_addr = 0x10000;
static int nerrs = 0;
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static sig_atomic_t got_signal;
static void sighandler(int sig, siginfo_t *info, void *ctx_void)
@@ -15,7 +15,6 @@
#include <sys/user.h>
#include <asm/prctl.h>
#include <sys/prctl.h>
-#include <signal.h>
#include <limits.h>
#include <sys/ucontext.h>
#include <sched.h>
@@ -28,6 +27,8 @@
#include <sys/wait.h>
#include <setjmp.h>
+#include "helpers.h"
+
#ifndef __x86_64__
# error This test is 64-bit only
#endif
@@ -39,28 +40,6 @@ static unsigned short *shared_scratch;
static int nerrs;
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static void sigsegv(int sig, siginfo_t *si, void *ctx_void)
{
ucontext_t *ctx = (ucontext_t*)ctx_void;
new file mode 100644
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-only
+#define _GNU_SOURCE
+#include <string.h>
+#include <err.h>
+
+#include "helpers.h"
+
+void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
+ int flags)
+{
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_sigaction = handler;
+ sa.sa_flags = SA_SIGINFO | flags;
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(sig, &sa, 0))
+ err(1, "sigaction");
+}
+
+void clearhandler(int sig)
+{
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = SIG_DFL;
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(sig, &sa, 0))
+ err(1, "sigaction");
+}
@@ -2,8 +2,14 @@
#ifndef __SELFTESTS_X86_HELPERS_H
#define __SELFTESTS_X86_HELPERS_H
+#include <signal.h>
#include <asm/processor-flags.h>
+void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
+ int flags);
+
+void clearhandler(int sig);
+
static inline unsigned long get_eflags(void)
{
#ifdef __x86_64__
@@ -8,7 +8,6 @@
#include <err.h>
#include <stdio.h>
#include <stdint.h>
-#include <signal.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
@@ -20,30 +19,9 @@
#include <sched.h>
#include <sys/io.h>
-static int nerrs = 0;
-
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-
-}
+#include "helpers.h"
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
+static int nerrs = 0;
static jmp_buf jmpbuf;
@@ -8,7 +8,6 @@
#include <err.h>
#include <stdio.h>
#include <stdint.h>
-#include <signal.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
@@ -20,30 +19,9 @@
#include <sched.h>
#include <sys/io.h>
-static int nerrs = 0;
-
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-
-}
+#include "helpers.h"
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
+static int nerrs = 0;
static jmp_buf jmpbuf;
@@ -8,7 +8,6 @@
#include <err.h>
#include <stdio.h>
#include <stdint.h>
-#include <signal.h>
#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
@@ -26,6 +25,8 @@
#include <asm/prctl.h>
#include <sys/prctl.h>
+#include "helpers.h"
+
#define AR_ACCESSED (1<<8)
#define AR_TYPE_RODATA (0 * (1<<9))
@@ -506,20 +507,6 @@ static void fix_sa_restorer(int sig)
}
#endif
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-
- fix_sa_restorer(sig);
-}
-
static jmp_buf jmpbuf;
static void sigsegv(int sig, siginfo_t *info, void *ctx_void)
@@ -549,9 +536,11 @@ static void do_multicpu_tests(void)
}
sethandler(SIGSEGV, sigsegv, 0);
+ fix_sa_restorer(SIGSEGV);
#ifdef __i386__
/* True 32-bit kernels send SIGILL instead of SIGSEGV on IRET faults. */
sethandler(SIGILL, sigsegv, 0);
+ fix_sa_restorer(SIGILL);
#endif
printf("[RUN]\tCross-CPU LDT invalidation\n");
@@ -35,7 +35,8 @@
#include <string.h>
#include <setjmp.h>
#include <sys/prctl.h>
-#include <asm/processor-flags.h>
+
+#include "helpers.h"
#if __x86_64__
# define REG_IP REG_RIP
@@ -93,18 +94,6 @@ static void enable_watchpoint(void)
}
}
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static char const * const signames[] = {
[SIGSEGV] = "SIGSEGV",
[SIGBUS] = "SIBGUS",
@@ -15,6 +15,8 @@
#include <asm/ptrace-abi.h>
#include <sys/auxv.h>
+#include "helpers.h"
+
/* Bitness-agnostic defines for user_regs_struct fields. */
#ifdef __x86_64__
# define user_syscall_nr orig_rax
@@ -93,18 +95,6 @@ static siginfo_t wait_trap(pid_t chld)
return si;
}
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static void setsigign(int sig, int flags)
{
struct sigaction sa;
@@ -116,16 +106,6 @@ static void setsigign(int sig, int flags)
err(1, "sigaction");
}
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
#ifdef __x86_64__
# define REG_BP REG_RBP
#else
@@ -1,7 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
#define _GNU_SOURCE
-#include <signal.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
@@ -14,6 +13,8 @@
#include <sys/resource.h>
#include <setjmp.h>
+#include "helpers.h"
+
/* sigaltstack()-enforced minimum stack */
#define ENFORCED_MINSIGSTKSZ 2048
@@ -27,30 +28,6 @@ static bool sigalrm_expected;
static unsigned long at_minstack_size;
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
-static void clearhandler(int sig)
-{
- struct sigaction sa;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static int setup_altstack(void *start, unsigned long size)
{
stack_t ss;
@@ -36,7 +36,6 @@
#include <string.h>
#include <inttypes.h>
#include <sys/mman.h>
-#include <sys/signal.h>
#include <sys/ucontext.h>
#include <asm/ldt.h>
#include <err.h>
@@ -46,6 +45,8 @@
#include <sys/ptrace.h>
#include <sys/user.h>
+#include "helpers.h"
+
/* Pull in AR_xyz defines. */
typedef unsigned int u32;
typedef unsigned short u16;
@@ -138,28 +139,6 @@ static unsigned short LDT3(int idx)
return (idx << 3) | 7;
}
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static void add_ldt(const struct user_desc *desc, unsigned short *var,
const char *name)
{
@@ -21,7 +21,6 @@
#include <string.h>
#include <inttypes.h>
#include <sys/mman.h>
-#include <sys/signal.h>
#include <sys/ucontext.h>
#include <asm/ldt.h>
#include <err.h>
@@ -33,28 +32,6 @@
#include "helpers.h"
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static volatile sig_atomic_t sig_traps, sig_eflags;
sigjmp_buf jmpbuf;
@@ -9,7 +9,6 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
-#include <sys/signal.h>
#include <sys/ucontext.h>
#include <err.h>
#include <setjmp.h>
@@ -17,18 +16,6 @@
#include "helpers.h"
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static volatile sig_atomic_t sig_traps;
static sigjmp_buf jmpbuf;
@@ -10,7 +10,6 @@
#include <stdio.h>
#include <unistd.h>
#include <string.h>
-#include <signal.h>
#include <err.h>
#include <sys/syscall.h>
@@ -18,18 +17,6 @@
static unsigned int nerrs;
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static void sigtrap(int sig, siginfo_t *si, void *ctx_void)
{
}
@@ -11,7 +11,6 @@
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
-#include <sys/signal.h>
#include <sys/ucontext.h>
#include <sys/syscall.h>
#include <err.h>
@@ -22,6 +21,7 @@
#include <sys/mman.h>
#include <assert.h>
+#include "helpers.h"
asm (
".pushsection \".text\", \"ax\"\n\t"
@@ -39,28 +39,6 @@ asm (
extern const char test_page[];
static void const *current_test_page_addr = test_page;
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
-static void clearhandler(int sig)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
/* State used by our signal handlers. */
static gregset_t initial_regs;
@@ -11,7 +11,6 @@
#include <dlfcn.h>
#include <string.h>
#include <inttypes.h>
-#include <signal.h>
#include <sys/ucontext.h>
#include <errno.h>
#include <err.h>
@@ -39,18 +38,6 @@
/* max length of lines in /proc/self/maps - anything longer is skipped here */
#define MAPS_LINE_LEN 128
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
/* vsyscalls and vDSO */
bool vsyscall_map_r = false, vsyscall_map_x = false;
@@ -31,7 +31,6 @@ int main()
#include <string.h>
#include <inttypes.h>
#include <sys/mman.h>
-#include <signal.h>
#include <sys/ucontext.h>
#include <err.h>
#include <stddef.h>
@@ -43,18 +42,6 @@ int main()
#include <dlfcn.h>
#include <unwind.h>
-static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
- int flags)
-{
- struct sigaction sa;
- memset(&sa, 0, sizeof(sa));
- sa.sa_sigaction = handler;
- sa.sa_flags = SA_SIGINFO | flags;
- sigemptyset(&sa.sa_mask);
- if (sigaction(sig, &sa, 0))
- err(1, "sigaction");
-}
-
static volatile sig_atomic_t nerrs;
static unsigned long sysinfo;
static bool got_sysinfo = false;
Many test cases have the same signal handler (un)register helpers which have been copied exactly over there. Clean up this by moving this helper into a common place. Also, update the Makefile to support this shared code. Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Borislav Petkov <bp@alien8.de> Cc: linux-kernel@vger.kernel.org Cc: linux-kselftest@vger.kernel.org --- tools/testing/selftests/x86/Makefile | 16 ++++++++-- tools/testing/selftests/x86/amx.c | 25 +--------------- .../selftests/x86/corrupt_xstate_header.c | 15 +--------- tools/testing/selftests/x86/entry_from_vm86.c | 25 ++-------------- tools/testing/selftests/x86/fsgsbase.c | 25 ++-------------- tools/testing/selftests/x86/helpers.c | 30 +++++++++++++++++++ tools/testing/selftests/x86/helpers.h | 6 ++++ tools/testing/selftests/x86/ioperm.c | 26 ++-------------- tools/testing/selftests/x86/iopl.c | 26 ++-------------- tools/testing/selftests/x86/ldt_gdt.c | 19 +++--------- tools/testing/selftests/x86/mov_ss_trap.c | 15 ++-------- tools/testing/selftests/x86/ptrace_syscall.c | 24 ++------------- tools/testing/selftests/x86/sigaltstack.c | 27 ++--------------- tools/testing/selftests/x86/sigreturn.c | 25 ++-------------- .../selftests/x86/single_step_syscall.c | 23 -------------- .../testing/selftests/x86/syscall_arg_fault.c | 13 -------- tools/testing/selftests/x86/syscall_nt.c | 13 -------- tools/testing/selftests/x86/sysret_rip.c | 24 +-------------- tools/testing/selftests/x86/test_vsyscall.c | 13 -------- tools/testing/selftests/x86/unwind_vdso.c | 13 -------- 20 files changed, 72 insertions(+), 331 deletions(-) create mode 100644 tools/testing/selftests/x86/helpers.c