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Mon, 01 Feb 2021 11:42:01 -0800 (PST) From: Andrei Vagin To: Will Deacon , Catalin Marinas Cc: Oleg Nesterov , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Anthony Steinhauser , Andrei Vagin , Dave Martin , Keno Fischer Subject: [PATCH 3/3] selftest/arm64/ptrace: add tests for PTRACE_O_ARM64_RAW_REGS Date: Mon, 1 Feb 2021 11:40:12 -0800 Message-Id: <20210201194012.524831-4-avagin@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210201194012.524831-1-avagin@gmail.com> References: <20210201194012.524831-1-avagin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Test output: TAP version 13 1..2 # selftests: arm64/ptrace: ptrace_syscall_raw_regs_test # 1..2 # ok 1 x7: 686920776f726c64 # ok 2 The child exited with code 0. # # Totals: pass:2 fail:0 xfail:0 xpass:0 skip:0 error:0 ok 1 selftests: arm64/ptrace: ptrace_syscall_raw_regs_test # selftests: arm64/ptrace: ptrace_syscall_regs_test # 1..3 # ok 1 x7: 0 # ok 2 x7: 1 # ok 3 The child exited with code 0. # # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0 ok 2 selftests: arm64/ptrace: ptrace_syscall_regs_test Signed-off-by: Andrei Vagin --- tools/testing/selftests/arm64/Makefile | 2 +- tools/testing/selftests/arm64/ptrace/Makefile | 6 + .../ptrace/ptrace_syscall_raw_regs_test.c | 142 +++++++++++++++++ .../arm64/ptrace/ptrace_syscall_regs_test.c | 150 ++++++++++++++++++ 4 files changed, 299 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/arm64/ptrace/Makefile create mode 100644 tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c create mode 100644 tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile index 2c9d012797a7..704770a60ece 100644 --- a/tools/testing/selftests/arm64/Makefile +++ b/tools/testing/selftests/arm64/Makefile @@ -4,7 +4,7 @@ ARCH ?= $(shell uname -m 2>/dev/null || echo not) ifneq (,$(filter $(ARCH),aarch64 arm64)) -ARM64_SUBTARGETS ?= tags signal pauth fp mte +ARM64_SUBTARGETS ?= tags signal pauth fp mte ptrace else ARM64_SUBTARGETS := endif diff --git a/tools/testing/selftests/arm64/ptrace/Makefile b/tools/testing/selftests/arm64/ptrace/Makefile new file mode 100644 index 000000000000..84b27449f3d1 --- /dev/null +++ b/tools/testing/selftests/arm64/ptrace/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 + +CFLAGS += -g -I../../../../../usr/include/ +TEST_GEN_PROGS := ptrace_syscall_raw_regs_test ptrace_syscall_regs_test + +include ../../lib.mk diff --git a/tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c new file mode 100644 index 000000000000..78f913303a99 --- /dev/null +++ b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "../../kselftest.h" + +#define TEST_VAL 0x686920776f726c64UL + +#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__) + +static long loop(void *val) +{ + register long x0 __asm__("x0"); + register void *x1 __asm__("x1") = val; + register long x8 __asm__("x8") = 555; + + __asm__ ( + "again:\n" + "ldr x7, [x1, 0]\n" + "svc 0\n" + "str x7, [x1, 0]\n" + : "=r"(x0) + : "r"(x1), "r"(x8) + : + ); + return 0; +} + +static int child(void) +{ + long val = TEST_VAL; + + loop(&val); + if (val != ~TEST_VAL) { + ksft_print_msg("Unexpected x7: %lx\n", val); + return 1; + } + + return 0; +} + +#ifndef PTRACE_SYSEMU +#define PTRACE_SYSEMU 31 +#endif + +#ifndef PTRACE_O_ARM64_RAW_REGS +#define PTRACE_O_ARM64_RAW_REGS (1 << 28) +#endif + +int main(int argc, void **argv) +{ + struct user_regs_struct regs = {}; + struct iovec iov = { + .iov_base = ®s, + .iov_len = sizeof(struct user_regs_struct), + }; + int status; + pid_t pid; + + ksft_set_plan(2); + + pid = fork(); + if (pid == 0) { + kill(getpid(), SIGSTOP); + child(); + _exit(0); + } + if (pid < 0) + return 1; + + if (ptrace(PTRACE_ATTACH, pid, 0, 0)) + return pr_perror("Can't attach to the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (ptrace(PTRACE_SETOPTIONS, pid, 0, PTRACE_O_ARM64_RAW_REGS)) + return pr_perror("Can't set PTRACE_O_ARM64_RAW_REGS"); + /* skip SIGSTOP */ + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + /* Resume the child to the next system call. */ + if (ptrace(PTRACE_SYSEMU, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGTRAP) + return pr_err("Unexpected status: %d", status); + + /* Check that x7 isnt't clobbered if PTRACE_O_ARM64_RAW_REGS is set. */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't get child registers"); + if (regs.regs[7] != TEST_VAL) + return pr_fail("unexpected x7: %lx", regs.regs[7]); + ksft_test_result_pass("x7: %llx\n", regs.regs[7]); + + /* Check that the child will see a new value of x7. */ + regs.regs[0] = 0; + regs.regs[7] = ~TEST_VAL; + if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't set child registers"); + + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + if (status != 0) + return pr_fail("Child exited with code %d.", status); + + ksft_test_result_pass("The child exited with code 0.\n"); + ksft_exit_pass(); + return 0; +} + diff --git a/tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c new file mode 100644 index 000000000000..d1534525ef26 --- /dev/null +++ b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "../../kselftest.h" + +#define TEST_VAL 0x686920776f726c64UL + +#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__) + +static long loop(void *val) +{ + register long x0 __asm__("x0"); + register void *x1 __asm__("x1") = val; + register long x8 __asm__("x8") = 555; + + __asm__ ( + "again:\n" + "ldr x7, [x1, 0]\n" + "svc 0\n" + "str x7, [x1, 0]\n" + : "=r"(x0) + : "r"(x1), "r"(x8) + : + ); + return 0; +} + +static int child(void) +{ + long val = TEST_VAL; + + loop(&val); + if (val != TEST_VAL) { + ksft_print_msg("Unexpected x7: %lx\n", val); + return 1; + } + + return 0; +} + +#ifndef PTRACE_O_ARM64_RAW_REGS +#define PTRACE_O_ARM64_RAW_REGS (1 << 28) +#endif + +int main(int argc, void **argv) +{ + struct user_regs_struct regs = {}; + struct iovec iov = { + .iov_base = ®s, + .iov_len = sizeof(struct user_regs_struct), + }; + int status; + pid_t pid; + + ksft_set_plan(3); + + pid = fork(); + if (pid == 0) { + kill(getpid(), SIGSTOP); + child(); + _exit(0); + } + if (pid < 0) + return 1; + + if (ptrace(PTRACE_ATTACH, pid, 0, 0)) + return pr_perror("Can't attach to the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + /* skip SIGSTOP */ + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + /* Resume the child to the next system call. */ + if (ptrace(PTRACE_SYSCALL, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGTRAP) + return pr_err("Unexpected status: %d", status); + + /* Check that x7 is 0 on syscall-enter. */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't get child registers"); + if (regs.regs[7] != 0) + return pr_fail("Unexpected x7: %lx", regs.regs[7]); + ksft_test_result_pass("x7: %llx\n", regs.regs[7]); + + if (ptrace(PTRACE_SYSCALL, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGTRAP) + return pr_err("Unexpected status: %d", status); + + /* Check that x7 is 1 on syscall-exit. */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't get child registers"); + if (regs.regs[7] != 1) + return pr_fail("Unexpected x7: %lx", regs.regs[7]); + ksft_test_result_pass("x7: %llx\n", regs.regs[7]); + + /* Check that the child will not a new value of x7. */ + regs.regs[0] = 0; + regs.regs[7] = ~TEST_VAL; + if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't set child registers"); + + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + if (status != 0) + return pr_fail("Child exited with code %d.", status); + + ksft_test_result_pass("The child exited with code 0.\n"); + ksft_exit_pass(); + return 0; +} + -- 2.29.2 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A776DC433E0 for ; Mon, 1 Feb 2021 19:43:28 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4695A64DBA for ; 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Mon, 01 Feb 2021 11:42:01 -0800 (PST) From: Andrei Vagin To: Will Deacon , Catalin Marinas Subject: [PATCH 3/3] selftest/arm64/ptrace: add tests for PTRACE_O_ARM64_RAW_REGS Date: Mon, 1 Feb 2021 11:40:12 -0800 Message-Id: <20210201194012.524831-4-avagin@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210201194012.524831-1-avagin@gmail.com> References: <20210201194012.524831-1-avagin@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210201_144205_354733_1266E5DD X-CRM114-Status: GOOD ( 20.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anthony Steinhauser , linux-api@vger.kernel.org, Oleg Nesterov , linux-kernel@vger.kernel.org, Keno Fischer , Andrei Vagin , Dave Martin , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Test output: TAP version 13 1..2 # selftests: arm64/ptrace: ptrace_syscall_raw_regs_test # 1..2 # ok 1 x7: 686920776f726c64 # ok 2 The child exited with code 0. # # Totals: pass:2 fail:0 xfail:0 xpass:0 skip:0 error:0 ok 1 selftests: arm64/ptrace: ptrace_syscall_raw_regs_test # selftests: arm64/ptrace: ptrace_syscall_regs_test # 1..3 # ok 1 x7: 0 # ok 2 x7: 1 # ok 3 The child exited with code 0. # # Totals: pass:3 fail:0 xfail:0 xpass:0 skip:0 error:0 ok 2 selftests: arm64/ptrace: ptrace_syscall_regs_test Signed-off-by: Andrei Vagin --- tools/testing/selftests/arm64/Makefile | 2 +- tools/testing/selftests/arm64/ptrace/Makefile | 6 + .../ptrace/ptrace_syscall_raw_regs_test.c | 142 +++++++++++++++++ .../arm64/ptrace/ptrace_syscall_regs_test.c | 150 ++++++++++++++++++ 4 files changed, 299 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/arm64/ptrace/Makefile create mode 100644 tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c create mode 100644 tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c diff --git a/tools/testing/selftests/arm64/Makefile b/tools/testing/selftests/arm64/Makefile index 2c9d012797a7..704770a60ece 100644 --- a/tools/testing/selftests/arm64/Makefile +++ b/tools/testing/selftests/arm64/Makefile @@ -4,7 +4,7 @@ ARCH ?= $(shell uname -m 2>/dev/null || echo not) ifneq (,$(filter $(ARCH),aarch64 arm64)) -ARM64_SUBTARGETS ?= tags signal pauth fp mte +ARM64_SUBTARGETS ?= tags signal pauth fp mte ptrace else ARM64_SUBTARGETS := endif diff --git a/tools/testing/selftests/arm64/ptrace/Makefile b/tools/testing/selftests/arm64/ptrace/Makefile new file mode 100644 index 000000000000..84b27449f3d1 --- /dev/null +++ b/tools/testing/selftests/arm64/ptrace/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0 + +CFLAGS += -g -I../../../../../usr/include/ +TEST_GEN_PROGS := ptrace_syscall_raw_regs_test ptrace_syscall_regs_test + +include ../../lib.mk diff --git a/tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c new file mode 100644 index 000000000000..78f913303a99 --- /dev/null +++ b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_raw_regs_test.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "../../kselftest.h" + +#define TEST_VAL 0x686920776f726c64UL + +#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__) + +static long loop(void *val) +{ + register long x0 __asm__("x0"); + register void *x1 __asm__("x1") = val; + register long x8 __asm__("x8") = 555; + + __asm__ ( + "again:\n" + "ldr x7, [x1, 0]\n" + "svc 0\n" + "str x7, [x1, 0]\n" + : "=r"(x0) + : "r"(x1), "r"(x8) + : + ); + return 0; +} + +static int child(void) +{ + long val = TEST_VAL; + + loop(&val); + if (val != ~TEST_VAL) { + ksft_print_msg("Unexpected x7: %lx\n", val); + return 1; + } + + return 0; +} + +#ifndef PTRACE_SYSEMU +#define PTRACE_SYSEMU 31 +#endif + +#ifndef PTRACE_O_ARM64_RAW_REGS +#define PTRACE_O_ARM64_RAW_REGS (1 << 28) +#endif + +int main(int argc, void **argv) +{ + struct user_regs_struct regs = {}; + struct iovec iov = { + .iov_base = ®s, + .iov_len = sizeof(struct user_regs_struct), + }; + int status; + pid_t pid; + + ksft_set_plan(2); + + pid = fork(); + if (pid == 0) { + kill(getpid(), SIGSTOP); + child(); + _exit(0); + } + if (pid < 0) + return 1; + + if (ptrace(PTRACE_ATTACH, pid, 0, 0)) + return pr_perror("Can't attach to the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (ptrace(PTRACE_SETOPTIONS, pid, 0, PTRACE_O_ARM64_RAW_REGS)) + return pr_perror("Can't set PTRACE_O_ARM64_RAW_REGS"); + /* skip SIGSTOP */ + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + /* Resume the child to the next system call. */ + if (ptrace(PTRACE_SYSEMU, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGTRAP) + return pr_err("Unexpected status: %d", status); + + /* Check that x7 isnt't clobbered if PTRACE_O_ARM64_RAW_REGS is set. */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't get child registers"); + if (regs.regs[7] != TEST_VAL) + return pr_fail("unexpected x7: %lx", regs.regs[7]); + ksft_test_result_pass("x7: %llx\n", regs.regs[7]); + + /* Check that the child will see a new value of x7. */ + regs.regs[0] = 0; + regs.regs[7] = ~TEST_VAL; + if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't set child registers"); + + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + if (status != 0) + return pr_fail("Child exited with code %d.", status); + + ksft_test_result_pass("The child exited with code 0.\n"); + ksft_exit_pass(); + return 0; +} + diff --git a/tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c new file mode 100644 index 000000000000..d1534525ef26 --- /dev/null +++ b/tools/testing/selftests/arm64/ptrace/ptrace_syscall_regs_test.c @@ -0,0 +1,150 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "../../kselftest.h" + +#define TEST_VAL 0x686920776f726c64UL + +#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__) + +static long loop(void *val) +{ + register long x0 __asm__("x0"); + register void *x1 __asm__("x1") = val; + register long x8 __asm__("x8") = 555; + + __asm__ ( + "again:\n" + "ldr x7, [x1, 0]\n" + "svc 0\n" + "str x7, [x1, 0]\n" + : "=r"(x0) + : "r"(x1), "r"(x8) + : + ); + return 0; +} + +static int child(void) +{ + long val = TEST_VAL; + + loop(&val); + if (val != TEST_VAL) { + ksft_print_msg("Unexpected x7: %lx\n", val); + return 1; + } + + return 0; +} + +#ifndef PTRACE_O_ARM64_RAW_REGS +#define PTRACE_O_ARM64_RAW_REGS (1 << 28) +#endif + +int main(int argc, void **argv) +{ + struct user_regs_struct regs = {}; + struct iovec iov = { + .iov_base = ®s, + .iov_len = sizeof(struct user_regs_struct), + }; + int status; + pid_t pid; + + ksft_set_plan(3); + + pid = fork(); + if (pid == 0) { + kill(getpid(), SIGSTOP); + child(); + _exit(0); + } + if (pid < 0) + return 1; + + if (ptrace(PTRACE_ATTACH, pid, 0, 0)) + return pr_perror("Can't attach to the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + /* skip SIGSTOP */ + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + /* Resume the child to the next system call. */ + if (ptrace(PTRACE_SYSCALL, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGTRAP) + return pr_err("Unexpected status: %d", status); + + /* Check that x7 is 0 on syscall-enter. */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't get child registers"); + if (regs.regs[7] != 0) + return pr_fail("Unexpected x7: %lx", regs.regs[7]); + ksft_test_result_pass("x7: %llx\n", regs.regs[7]); + + if (ptrace(PTRACE_SYSCALL, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + if (!WIFSTOPPED(status) || WSTOPSIG(status) != SIGTRAP) + return pr_err("Unexpected status: %d", status); + + /* Check that x7 is 1 on syscall-exit. */ + if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't get child registers"); + if (regs.regs[7] != 1) + return pr_fail("Unexpected x7: %lx", regs.regs[7]); + ksft_test_result_pass("x7: %llx\n", regs.regs[7]); + + /* Check that the child will not a new value of x7. */ + regs.regs[0] = 0; + regs.regs[7] = ~TEST_VAL; + if (ptrace(PTRACE_SETREGSET, pid, NT_PRSTATUS, &iov)) + return pr_perror("Can't set child registers"); + + if (ptrace(PTRACE_CONT, pid, 0, 0)) + return pr_perror("Can't resume the child %d", pid); + if (waitpid(pid, &status, 0) != pid) + return pr_perror("Can't wait for the child %d", pid); + + if (status != 0) + return pr_fail("Child exited with code %d.", status); + + ksft_test_result_pass("The child exited with code 0.\n"); + ksft_exit_pass(); + return 0; +} + -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel