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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/breakpoints/breakpoint_test_arm64.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/breakpoints/breakpoint_test_arm64.c')
-rw-r--r-- | tools/testing/selftests/breakpoints/breakpoint_test_arm64.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c new file mode 100644 index 000000000..ad41ea690 --- /dev/null +++ b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c @@ -0,0 +1,250 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2016 Google, Inc. + * + * Original Code by Pavel Labath <labath@google.com> + * + * Code modified by Pratyush Anand <panand@redhat.com> + * for testing different byte select for each access size. + */ + +#define _GNU_SOURCE + +#include <asm/ptrace.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <sys/ptrace.h> +#include <sys/param.h> +#include <sys/uio.h> +#include <stdint.h> +#include <stdbool.h> +#include <stddef.h> +#include <string.h> +#include <stdio.h> +#include <unistd.h> +#include <elf.h> +#include <errno.h> +#include <signal.h> + +#include "../kselftest.h" + +static volatile uint8_t var[96] __attribute__((__aligned__(32))); + +static void child(int size, int wr) +{ + volatile uint8_t *addr = &var[32 + wr]; + + if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) { + ksft_print_msg( + "ptrace(PTRACE_TRACEME) failed: %s\n", + strerror(errno)); + _exit(1); + } + + if (raise(SIGSTOP) != 0) { + ksft_print_msg( + "raise(SIGSTOP) failed: %s\n", strerror(errno)); + _exit(1); + } + + if ((uintptr_t) addr % size) { + ksft_print_msg( + "Wrong address write for the given size: %s\n", + strerror(errno)); + _exit(1); + } + + switch (size) { + case 1: + *addr = 47; + break; + case 2: + *(uint16_t *)addr = 47; + break; + case 4: + *(uint32_t *)addr = 47; + break; + case 8: + *(uint64_t *)addr = 47; + break; + case 16: + __asm__ volatile ("stp x29, x30, %0" : "=m" (addr[0])); + break; + case 32: + __asm__ volatile ("stp q29, q30, %0" : "=m" (addr[0])); + break; + } + + _exit(0); +} + +static bool set_watchpoint(pid_t pid, int size, int wp) +{ + const volatile uint8_t *addr = &var[32 + wp]; + const int offset = (uintptr_t)addr % 8; + const unsigned int byte_mask = ((1 << size) - 1) << offset; + const unsigned int type = 2; /* Write */ + const unsigned int enable = 1; + const unsigned int control = byte_mask << 5 | type << 3 | enable; + struct user_hwdebug_state dreg_state; + struct iovec iov; + + memset(&dreg_state, 0, sizeof(dreg_state)); + dreg_state.dbg_regs[0].addr = (uintptr_t)(addr - offset); + dreg_state.dbg_regs[0].ctrl = control; + iov.iov_base = &dreg_state; + iov.iov_len = offsetof(struct user_hwdebug_state, dbg_regs) + + sizeof(dreg_state.dbg_regs[0]); + if (ptrace(PTRACE_SETREGSET, pid, NT_ARM_HW_WATCH, &iov) == 0) + return true; + + if (errno == EIO) + ksft_print_msg( + "ptrace(PTRACE_SETREGSET, NT_ARM_HW_WATCH) not supported on this hardware: %s\n", + strerror(errno)); + + ksft_print_msg( + "ptrace(PTRACE_SETREGSET, NT_ARM_HW_WATCH) failed: %s\n", + strerror(errno)); + return false; +} + +static bool run_test(int wr_size, int wp_size, int wr, int wp) +{ + int status; + siginfo_t siginfo; + pid_t pid = fork(); + pid_t wpid; + + if (pid < 0) { + ksft_test_result_fail( + "fork() failed: %s\n", strerror(errno)); + return false; + } + if (pid == 0) + child(wr_size, wr); + + wpid = waitpid(pid, &status, __WALL); + if (wpid != pid) { + ksft_print_msg( + "waitpid() failed: %s\n", strerror(errno)); + return false; + } + if (!WIFSTOPPED(status)) { + ksft_print_msg( + "child did not stop: %s\n", strerror(errno)); + return false; + } + if (WSTOPSIG(status) != SIGSTOP) { + ksft_print_msg("child did not stop with SIGSTOP\n"); + return false; + } + + if (!set_watchpoint(pid, wp_size, wp)) + return false; + + if (ptrace(PTRACE_CONT, pid, NULL, NULL) < 0) { + ksft_print_msg( + "ptrace(PTRACE_SINGLESTEP) failed: %s\n", + strerror(errno)); + return false; + } + + alarm(3); + wpid = waitpid(pid, &status, __WALL); + if (wpid != pid) { + ksft_print_msg( + "waitpid() failed: %s\n", strerror(errno)); + return false; + } + alarm(0); + if (WIFEXITED(status)) { + ksft_print_msg("child did not single-step\n"); + return false; + } + if (!WIFSTOPPED(status)) { + ksft_print_msg("child did not stop\n"); + return false; + } + if (WSTOPSIG(status) != SIGTRAP) { + ksft_print_msg("child did not stop with SIGTRAP\n"); + return false; + } + if (ptrace(PTRACE_GETSIGINFO, pid, NULL, &siginfo) != 0) { + ksft_print_msg( + "ptrace(PTRACE_GETSIGINFO): %s\n", + strerror(errno)); + return false; + } + if (siginfo.si_code != TRAP_HWBKPT) { + ksft_print_msg( + "Unexpected si_code %d\n", siginfo.si_code); + return false; + } + + kill(pid, SIGKILL); + wpid = waitpid(pid, &status, 0); + if (wpid != pid) { + ksft_print_msg( + "waitpid() failed: %s\n", strerror(errno)); + return false; + } + return true; +} + +static void sigalrm(int sig) +{ +} + +int main(int argc, char **argv) +{ + int opt; + bool succeeded = true; + struct sigaction act; + int wr, wp, size; + bool result; + + ksft_print_header(); + ksft_set_plan(213); + + act.sa_handler = sigalrm; + sigemptyset(&act.sa_mask); + act.sa_flags = 0; + sigaction(SIGALRM, &act, NULL); + for (size = 1; size <= 32; size = size*2) { + for (wr = 0; wr <= 32; wr = wr + size) { + for (wp = wr - size; wp <= wr + size; wp = wp + size) { + result = run_test(size, MIN(size, 8), wr, wp); + if ((result && wr == wp) || + (!result && wr != wp)) + ksft_test_result_pass( + "Test size = %d write offset = %d watchpoint offset = %d\n", + size, wr, wp); + else { + ksft_test_result_fail( + "Test size = %d write offset = %d watchpoint offset = %d\n", + size, wr, wp); + succeeded = false; + } + } + } + } + + for (size = 1; size <= 32; size = size*2) { + if (run_test(size, 8, -size, -8)) + ksft_test_result_pass( + "Test size = %d write offset = %d watchpoint offset = -8\n", + size, -size); + else { + ksft_test_result_fail( + "Test size = %d write offset = %d watchpoint offset = -8\n", + size, -size); + succeeded = false; + } + } + + if (succeeded) + ksft_exit_pass(); + else + ksft_exit_fail(); +} |