selftests: add tests for process_vm_exec
Output:
$ make run_tests
TAP version 13
1..4
# selftests: process_vm_exec: process_vm_exec
# 1..1
# ok 1 275 ns/syscall
# # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
ok 1 selftests: process_vm_exec: process_vm_exec
# selftests: process_vm_exec: process_vm_exec_fault
# 1..1
# ok 1 789 ns/signal
# # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
ok 2 selftests: process_vm_exec: process_vm_exec_fault
# selftests: process_vm_exec: ptrace_vm_exec
# 1..1
# ok 1 1378 ns/syscall# Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
ok 3 selftests: process_vm_exec: ptrace_vm_exec
# selftests: process_vm_exec: process_vm_exec_syscall
# 1..1
# ok 1 write works as expectd
# # Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
ok 4 selftests: process_vm_exec: process_vm_exec_syscall
BUG=183648601
TEST=Compiled and verified locally
SOURCE=FROMLIST(https://lore.kernel.org/linux-api/20210414055217.543246-1-avagin@gmail.com/`)
RELEASE_NOTE=Port process_vm_exec to the COS kernel.
Signed-off-by: Andrei Vagin <avagin@google.com>
Change-Id: I6dcd9069afbeca223ab212dcf6395add63f685f0
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/17936
Reviewed-by: Oleksandr Tymoshenko <ovt@google.com>
Tested-by: Oleksandr Tymoshenko <ovt@google.com>
diff --git a/tools/testing/selftests/process_vm_exec/Makefile b/tools/testing/selftests/process_vm_exec/Makefile
new file mode 100644
index 0000000..8ca1c84
--- /dev/null
+++ b/tools/testing/selftests/process_vm_exec/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+
+UNAME_M := $(shell uname -m)
+ARCH ?= $(shell echo $(UNAME_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/ -e s/aarch64/arm64/)
+
+CFLAGS += -iquote../../../../include/uapi -iquote../../../../arch/$(ARCH)/include/uapi
+
+TEST_GEN_PROGS_x86_64 := process_vm_exec process_vm_exec_fault ptrace_vm_exec process_vm_exec_syscall process_vm_exec_signal
+TEST_GEN_PROGS_aarch64 := $(TEST_GEN_PROGS_x86_64)
+TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))
+
+include ../lib.mk
+
+$(OUTPUT)/process_vm_exec_signal: CFLAGS += -DPROCESS_VM_EXEC_TEST_SIGNAL
diff --git a/tools/testing/selftests/process_vm_exec/log.h b/tools/testing/selftests/process_vm_exec/log.h
new file mode 100644
index 0000000..ef268c2
--- /dev/null
+++ b/tools/testing/selftests/process_vm_exec/log.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __SELFTEST_PROCESS_VM_EXEC_LOG_H__
+#define __SELFTEST_PROCESS_VM_EXEC_LOG_H__
+
+#define pr_msg(fmt, lvl, ...) \
+ ksft_print_msg("[%s] (%s:%d)\t" fmt "\n", \
+ lvl, __FILE__, __LINE__, ##__VA_ARGS__)
+
+#define pr_p(func, fmt, ...) func(fmt ": %m", ##__VA_ARGS__)
+
+#define pr_err(fmt, ...) \
+ ({ \
+ ksft_test_result_error(fmt "\n", ##__VA_ARGS__); \
+ -1; \
+ })
+
+#define pr_fail(fmt, ...) \
+ ({ \
+ ksft_test_result_fail(fmt "\n", ##__VA_ARGS__); \
+ -1; \
+ })
+
+#define pr_perror(fmt, ...) pr_p(pr_err, fmt, ##__VA_ARGS__)
+
+#endif
diff --git a/tools/testing/selftests/process_vm_exec/process_vm_exec.c b/tools/testing/selftests/process_vm_exec/process_vm_exec.c
new file mode 100644
index 0000000..4f2e7e4
--- /dev/null
+++ b/tools/testing/selftests/process_vm_exec/process_vm_exec.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/user.h>
+#include <sys/uio.h>
+#include <sys/prctl.h>
+#include "asm/unistd.h"
+#include <time.h>
+#include <sys/mman.h>
+#include <stdint.h>
+
+#include "asm/process_vm_exec.h"
+#include "linux/process_vm_exec.h"
+
+#include "../kselftest.h"
+#include "log.h"
+
+#ifndef __NR_process_vm_exec
+#define __NR_process_vm_exec 441
+#endif
+
+#define TEST_SYSCALL 123
+#define TEST_SYSCALL_RET 456
+#define TEST_MARKER 789
+#define TEST_TIMEOUT 5
+#define TEST_STACK_SIZE 65536
+
+#if defined(__x86_64__)
+static inline long __syscall1(long n, long a1)
+{
+ unsigned long ret;
+
+ __asm__ __volatile__ ("syscall" : "=a"(ret) : "a"(n), "D"(a1) : "rcx", "r11", "memory");
+
+ return ret;
+}
+#elif defined(__aarch64__)
+#define __asm_syscall(...) do { \
+ __asm__ __volatile__ ( "svc 0" \
+ : "=r"(x0) : __VA_ARGS__ : "memory", "cc"); \
+ return x0; \
+ } while (0)
+
+
+static inline long __syscall1(long n, long a)
+{
+ register long x8 __asm__("x8") = n;
+ register long x0 __asm__("x0") = a;
+ __asm_syscall("r"(x8), "0"(x0));
+}
+#endif
+
+int marker;
+
+static void guest(void)
+{
+ while (1)
+ if (__syscall1(TEST_SYSCALL, marker) != TEST_SYSCALL_RET)
+ abort();
+}
+
+int main(int argc, char **argv)
+{
+ struct process_vm_exec_context ctx = {
+ .version = PROCESS_VM_EXEC_GOOGLE_V1,
+ };
+ struct timespec start, cur;
+ int status, ret, i;
+ pid_t pid;
+ long sysnr;
+ void *stack;
+
+ ksft_set_plan(1);
+
+ stack = mmap(NULL, TEST_STACK_SIZE, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+ if (stack == MAP_FAILED)
+ return pr_perror("mmap");
+
+ pid = fork();
+ if (pid == 0) {
+ marker = TEST_MARKER;
+ prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
+ kill(getpid(), SIGSTOP);
+ /* unreachable */
+ abort();
+ return 0;
+ }
+
+#if defined(__x86_64__)
+ ctx.sigctx.rip = (long)guest;
+ ctx.sigctx.rsp = (long)stack + TEST_STACK_SIZE;
+ ctx.sigctx.cs = 0x33;
+#elif defined(__aarch64__)
+ ctx.sigctx.pc = (long)guest;
+ ctx.sigctx.pstate = 0x40001000;
+ ctx.sigctx.sp = (long)stack + TEST_STACK_SIZE;
+#endif
+
+ sysnr = 0;
+ clock_gettime(CLOCK_MONOTONIC, &start);
+ while (1) {
+ unsigned long long sigmask = 0xffffffff;
+ siginfo_t siginfo;
+
+ clock_gettime(CLOCK_MONOTONIC, &cur);
+ if (start.tv_sec + TEST_TIMEOUT < cur.tv_sec ||
+ (start.tv_sec + TEST_TIMEOUT == cur.tv_sec &&
+ start.tv_nsec < cur.tv_nsec))
+ break;
+
+ ret = syscall(__NR_process_vm_exec, pid, &ctx, 0, &siginfo, &sigmask, 8);
+#ifdef __DEBUG
+ ksft_print_msg("ret %d signo %d sysno %d ip %lx\n",
+ ret, siginfo.si_signo, siginfo.si_syscall, ctx.rip);
+#endif
+ if (ret != 0)
+ pr_fail("unexpected return code: ret %d errno %d", ret, errno);
+ if (siginfo.si_signo != SIGSYS)
+ pr_fail("unexpected signal: %d", siginfo.si_signo);
+ if (siginfo.si_syscall != TEST_SYSCALL)
+ pr_fail("unexpected syscall: %d", siginfo.si_syscall);
+#if defined(__x86_64__)
+ ctx.sigctx.rax = TEST_SYSCALL_RET;
+#elif defined(__aarch64__)
+ ctx.sigctx.regs[0] = TEST_SYSCALL_RET;
+#endif
+ sysnr++;
+ }
+ ksft_test_result_pass("%ld ns/syscall\n", 1000000000 / sysnr);
+ ksft_exit_pass();
+ return 0;
+}
diff --git a/tools/testing/selftests/process_vm_exec/process_vm_exec_fault.c b/tools/testing/selftests/process_vm_exec/process_vm_exec_fault.c
new file mode 100644
index 0000000..ad8afe8
--- /dev/null
+++ b/tools/testing/selftests/process_vm_exec/process_vm_exec_fault.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
+#include <sys/user.h>
+#include <sys/uio.h>
+#include <asm/unistd.h>
+#include <sys/ptrace.h>
+#include <linux/elf.h>
+
+#include "asm/process_vm_exec.h"
+#include "linux/process_vm_exec.h"
+
+#include "../kselftest.h"
+#include "log.h"
+
+#ifndef __NR_process_vm_exec
+#define __NR_process_vm_exec 441
+#endif
+
+#define TEST_TIMEOUT 5
+#define TEST_STACK_SIZE 65536
+
+#define TEST_VAL 0xaabbccddee
+
+unsigned long test_val;
+
+#if defined(__x86_64__)
+static inline void fault(long *addr, long val)
+{
+ __asm__ __volatile__ (
+ "movq %%rcx, (%%rax)\n"
+ :
+ : "a"(addr), "c"(val)
+ :);
+}
+#elif defined(__aarch64__)
+static void fault(long *addr, long val)
+{
+ *addr = val;
+}
+
+static void fault(long *addr, long val) __attribute__((noinline));
+#endif
+
+int marker;
+
+static void guest(void)
+{
+ long *addr = 0;
+
+ while (1) {
+ addr = (long *)(((long)addr + 1) % 8);
+ fault(addr, 0);
+ if (test_val != TEST_VAL)
+ _exit(1);
+ }
+}
+
+static long fault_addr;
+#ifdef PROCESS_VM_EXEC_TEST_SIGNAL
+static void segv(int signo, siginfo_t *info, void *data)
+{
+ fault_addr = (long)info->si_addr;
+}
+#endif
+
+int main(char argc, char **argv)
+{
+ unsigned long long sigmask = 0xffffffff;
+ struct process_vm_exec_context ctx = {
+ .version = PROCESS_VM_EXEC_GOOGLE_V1,
+ };
+ siginfo_t siginfo;
+ struct timespec start, cur;
+ unsigned long addr;
+ int status, ret, i;
+ char *stack;
+ pid_t pid;
+ long faults;
+
+ ksft_set_plan(1);
+
+ stack = mmap(NULL, TEST_STACK_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_ANONYMOUS, 0, 0);
+ if (stack == MAP_FAILED)
+ return pr_perror("mmap");
+
+ pid = fork();
+ if (pid == 0) {
+ prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
+ kill(getpid(), SIGSTOP);
+ /* unreachable */
+ abort();
+ return 0;
+ }
+
+#ifdef PROCESS_VM_EXEC_TEST_SIGNAL
+ {
+ struct sigaction act = {
+ .sa_sigaction = segv,
+ .sa_flags = SA_SIGINFO,
+ };
+ if (sigaction(SIGSEGV, &act, NULL))
+ return pr_perror("sigaction");
+ sigmask = 0;
+ }
+#endif
+
+#if defined(__x86_64__)
+ ctx.sigctx.rip = (long)guest;
+ ctx.sigctx.rsp = (long)stack + TEST_STACK_SIZE;
+ ctx.sigctx.cs = 0x33;
+#elif defined(__aarch64__)
+ ctx.sigctx.pc = (long)guest;
+ ctx.sigctx.pstate = 0x40001000;
+ ctx.sigctx.sp = (long)stack + TEST_STACK_SIZE;
+#endif
+
+ faults = 0;
+ addr = 0;
+ clock_gettime(CLOCK_MONOTONIC, &start);
+ while (1) {
+ addr = (addr + 1) % 8;
+
+ clock_gettime(CLOCK_MONOTONIC, &cur);
+ if (start.tv_sec + TEST_TIMEOUT < cur.tv_sec ||
+ (start.tv_sec + TEST_TIMEOUT == cur.tv_sec &&
+ start.tv_nsec < cur.tv_nsec))
+ break;
+
+ ret = syscall(__NR_process_vm_exec, pid, &ctx, 0, &siginfo, &sigmask, 8);
+#ifndef PROCESS_VM_EXEC_TEST_SIGNAL
+ fault_addr = (long)siginfo.si_addr;
+#endif
+ if (fault_addr != addr % 8)
+ return pr_fail("unexpected address: %lx", fault_addr);
+#if defined(__x86_64__)
+ if (addr % 8 != ctx.sigctx.rax)
+ return pr_fail("unexpected address: %lx", ctx.sigctx.rax);
+ ctx.sigctx.rax = (long)&test_val;
+ ctx.sigctx.rcx = TEST_VAL;
+#elif defined(__aarch64__)
+ if (addr % 8 != ctx.sigctx.regs[0])
+ return pr_fail("unexpected address: %lx", ctx.sigctx.regs[0]);
+ ctx.sigctx.regs[0] = (long)&test_val;
+ ctx.sigctx.regs[1] = TEST_VAL;
+#endif
+ faults++;
+ }
+ ksft_test_result_pass("%ld ns/signal\n", 1000000000 / faults);
+ ksft_exit_pass();
+ return 0;
+}
diff --git a/tools/testing/selftests/process_vm_exec/process_vm_exec_signal.c b/tools/testing/selftests/process_vm_exec/process_vm_exec_signal.c
new file mode 120000
index 0000000..b6f5819
--- /dev/null
+++ b/tools/testing/selftests/process_vm_exec/process_vm_exec_signal.c
@@ -0,0 +1 @@
+process_vm_exec_fault.c
\ No newline at end of file
diff --git a/tools/testing/selftests/process_vm_exec/process_vm_exec_syscall.c b/tools/testing/selftests/process_vm_exec/process_vm_exec_syscall.c
new file mode 100644
index 0000000..581c262
--- /dev/null
+++ b/tools/testing/selftests/process_vm_exec/process_vm_exec_syscall.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+#include <signal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/prctl.h>
+#include <sys/user.h>
+#include <sys/uio.h>
+#include <asm/unistd.h>
+
+#include "asm/process_vm_exec.h"
+#include "linux/process_vm_exec.h"
+
+#include "../kselftest.h"
+#include "log.h"
+
+#ifndef __NR_process_vm_exec
+#define __NR_process_vm_exec 441
+#endif
+
+#ifndef PROCESS_VM_EXEC_SYSCALL
+#define PROCESS_VM_EXEC_SYSCALL 0x1
+#endif
+
+#define TEST_VAL 0x1e511e51
+
+int test_val = TEST_VAL;
+
+int main(int argc, char **argv)
+{
+ struct process_vm_exec_context ctx = {
+ .version = PROCESS_VM_EXEC_GOOGLE_V1,
+ };
+ unsigned long long sigmask;
+ int ret, p[2], val;
+ siginfo_t siginfo = {};
+ pid_t pid;
+
+ ksft_set_plan(1);
+
+ pid = fork();
+ if (pid < 0)
+ return pr_perror("fork");
+ if (pid == 0) {
+ prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
+ kill(getpid(), SIGSTOP);
+ return 0;
+ }
+
+ test_val = 0;
+ if (pipe(p))
+ return pr_perror("pipe");
+
+#if defined(__x86_64__)
+ ctx.sigctx.rax = __NR_write;
+ ctx.sigctx.rdi = p[1];
+ ctx.sigctx.rsi = (unsigned long) &test_val;
+ ctx.sigctx.rdx = sizeof(test_val);
+ ctx.sigctx.r10 = 0;
+ ctx.sigctx.r8 = 0;
+ ctx.sigctx.r9 = 0;
+#elif defined(__aarch64__)
+ ctx.sigctx.regs[8] = __NR_write;
+ ctx.sigctx.regs[0] = p[1];
+ ctx.sigctx.regs[1] = (unsigned long) &test_val;
+ ctx.sigctx.regs[2] = sizeof(test_val);
+ ctx.sigctx.regs[3] = 0;
+ ctx.sigctx.regs[4] = 0;
+ ctx.sigctx.regs[5] = 0;
+#endif
+ sigmask = 0xffffffff;
+ ret = syscall(__NR_process_vm_exec, pid, &ctx, PROCESS_VM_EXEC_SYSCALL,
+ &siginfo, &sigmask, 8);
+ if (ret != 0)
+ return pr_perror("process_vm_exec");
+ if (siginfo.si_signo != 0)
+ return pr_fail("unexpected signal: %d", siginfo.si_signo);
+#if defined(__x86_64__)
+ if (ctx.sigctx.rax != sizeof(test_val))
+ pr_fail("unexpected rax: %lx", ctx.sigctx.rax);
+#elif defined(__aarch64__)
+ if (ctx.sigctx.regs[0] != sizeof(test_val))
+ pr_fail("unexpected r0: %lx", ctx.sigctx.regs[0]);
+#endif
+ if (kill(pid, SIGKILL))
+ return pr_perror("kill");
+ if (wait(NULL) != pid)
+ return pr_perror("kill");
+ if (read(p[0], &val, sizeof(val)) != sizeof(val))
+ pr_perror("read");
+ if (val != TEST_VAL)
+ pr_fail("unexpected data: %x", val);
+ ksft_test_result_pass("process_vm_exec(..., PROCESS_VM_EXEC_SYSCALL, ...) \n");
+ ksft_exit_pass();
+ return 0;
+}
diff --git a/tools/testing/selftests/process_vm_exec/ptrace_vm_exec.c b/tools/testing/selftests/process_vm_exec/ptrace_vm_exec.c
new file mode 100644
index 0000000..b322214
--- /dev/null
+++ b/tools/testing/selftests/process_vm_exec/ptrace_vm_exec.c
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <sys/ptrace.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <linux/unistd.h>
+#include <stdio.h>
+#include <sys/user.h>
+#include <sys/uio.h>
+#include <time.h>
+#include <linux/elf.h>
+
+#include "../kselftest.h"
+#include "log.h"
+
+#ifndef PTRACE_SYSEMU
+#define PTRACE_SYSEMU 31
+#endif
+
+#if defined(__x86_64__)
+static inline long __syscall1(long n, long a1)
+{
+ unsigned long ret;
+
+ __asm__ __volatile__ ("syscall" : "=a"(ret) : "a"(n), "D"(a1) : "rcx", "r11", "memory");
+
+ return ret;
+}
+#elif defined(__aarch64__)
+#define __asm_syscall(...) do { \
+ __asm__ __volatile__ ( "svc 0" \
+ : "=r"(x0) : __VA_ARGS__ : "memory", "cc"); \
+ return x0; \
+ } while (0)
+
+
+static inline long __syscall1(long n, long a)
+{
+ register long x8 __asm__("x8") = n;
+ register long x0 __asm__("x0") = a;
+ __asm_syscall("r"(x8), "0"(x0));
+}
+#endif
+
+#define TEST_SYSCALL 444
+#define TEST_SYSCALL_RET 555
+#define TEST_MARKER 789
+#define TEST_TIMEOUT 5
+
+static int marker;
+
+static void guest(void)
+{
+ while (1) {
+ int ret;
+
+ ret = __syscall1(TEST_SYSCALL, marker);
+ if (ret != TEST_SYSCALL_RET)
+ abort();
+ }
+}
+
+int main(int argc, char **argv)
+{
+ struct user_regs_struct regs = {};
+ struct iovec iov;
+ iov.iov_base = ®s;
+ iov.iov_len = sizeof(regs);
+
+
+ struct timespec start, cur;
+ int status;
+ long sysnr;
+ pid_t pid;
+
+ ksft_set_plan(1);
+
+ pid = fork();
+ if (pid == 0) {
+ marker = TEST_MARKER;
+ kill(getpid(), SIGSTOP);
+ /* unreachable */
+ abort();
+ return 0;
+ }
+
+ if (waitpid(pid, &status, WUNTRACED) != pid)
+ return pr_perror("waidpid");
+ if (ptrace(PTRACE_ATTACH, pid, 0, 0))
+ return pr_perror("PTRACE_ATTACH");
+ if (wait(&status) != pid)
+ return pr_perror("waidpid");
+ if (ptrace(PTRACE_CONT, pid, 0, 0))
+ return pr_perror("PTRACE_CONT");
+ if (waitpid(pid, &status, 0) != pid)
+ return pr_perror("waidpid");
+
+ if (ptrace(PTRACE_SETOPTIONS, pid, 0, PTRACE_O_EXITKILL))
+ return pr_perror("PTRACE_SETOPTIONS");
+ if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov) == -1)
+ return pr_perror("PTRACE_GETREGS");
+#if defined(__x86_64__)
+ regs.rip = (long)guest;
+#elif defined(__aarch64__)
+ regs.pc = (long)guest;
+#endif
+
+ clock_gettime(CLOCK_MONOTONIC, &start);
+ for (sysnr = 0; ; sysnr++) {
+ int status;
+
+ clock_gettime(CLOCK_MONOTONIC, &cur);
+ if (start.tv_sec + TEST_TIMEOUT < cur.tv_sec ||
+ (start.tv_sec + TEST_TIMEOUT == cur.tv_sec &&
+ start.tv_nsec < cur.tv_nsec))
+ break;
+ if (ptrace(PTRACE_SETREGSET, pid, (void*)NT_PRSTATUS, (void*)&iov) == -1)
+ return pr_perror("PTRACE_GETREGS");
+ if (ptrace(PTRACE_SYSEMU, pid, 0, 0))
+ return pr_perror("PTRACE_SYSEMU");
+ if (waitpid(pid, &status, 0) != pid)
+ return pr_perror("waitpid");
+ if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGTRAP)
+ return pr_err("unexpected status: %d", status);
+ if (ptrace(PTRACE_GETREGSET, pid, (void*)NT_PRSTATUS, (void*)&iov) == -1)
+ return pr_perror("PTRACE_GETREGS");
+#if defined(__x86_64__)
+ if (regs.rdi != TEST_MARKER)
+ return pr_err("unexpected marker: %d", regs.rdi);
+ if (regs.orig_rax != TEST_SYSCALL)
+ return pr_err("unexpected syscall: %d", regs.orig_rax);
+ regs.rax = TEST_SYSCALL_RET;
+#elif defined(__aarch64__)
+ if (regs.regs[0] != TEST_MARKER)
+ return pr_err("unexpected marker");
+ if (regs.regs[8] != TEST_SYSCALL)
+ return pr_err("unexpected syscall: %d", regs.regs[0]);
+ regs.regs[0] = TEST_SYSCALL_RET;
+#endif
+ }
+ ksft_test_result_pass("%ld ns/syscall\n", 1000000000 / sysnr);
+ ksft_exit_pass();
+ return 0;
+}
