On Tue, Jun 25, 2024 at 05:54:05PM +0530, Dev Jain wrote:
> --- /dev/null
> +++ b/tools/testing/selftests/arm64/abi/ptrace.h
> @@ -0,0 +1,135 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2024 ARM Limited.
> + */
> +#include "../../kselftest.h"
> +
> +static void run_tests(pid_t child);
> +
> +static int do_child(void);
> +
> +#ifdef __aarch64__
> +static bool have_sme(void)
> +{
> + return getauxval(AT_HWCAP2) & HWCAP2_SME;
> +}
> +static void test_hw_debug(pid_t child, int type, const char *type_name)
> +{
> + struct user_hwdebug_state state;
> + struct iovec iov;
> + int slots, arch, ret;
> +
> + iov.iov_len = sizeof(state);
> + iov.iov_base = &state;
> +
> + /* Should be able to read the values */
> + ret = ptrace(PTRACE_GETREGSET, child, type, &iov);
> + ksft_test_result(ret == 0, "read_%s\n", type_name);
This feels like it's pulling way too much stuff out into the header. I
think some of this needs to be a C file that gets built for both
architectures with some mechanism they can use to run tests, and a
library of any shared tests.
> +
> + if (ret == 0) {
> + /* Low 8 bits is the number of slots, next 4 bits the arch */
> + slots = state.dbg_info & 0xff;
> + arch = (state.dbg_info >> 8) & 0xf;
> +
> + ksft_print_msg("%s version %d with %d slots\n", type_name,
> + arch, slots);
> +
> + /* Zero is not currently architecturally valid */
> + ksft_test_result(arch, "%s_arch_set\n", type_name);
> + } else {
> + ksft_test_result_skip("%s_arch_set\n", type_name);
> + }
> +}
> +#endif
> +
> +static int do_parent(pid_t child)
> +{
> + int ret = EXIT_FAILURE;
> + pid_t pid;
> + int status;
> + siginfo_t si;
> +
> + /* Attach to the child */
> + while (1) {
> + int sig;
> +
> + pid = wait(&status);
> + if (pid == -1) {
> + perror("wait");
> + goto error;
> + }
> +
> + /*
> + * This should never happen but it's hard to flag in
> + * the framework.
> + */
> + if (pid != child)
> + continue;
> +
> + if (WIFEXITED(status) || WIFSIGNALED(status))
> + ksft_exit_fail_msg("Child died unexpectedly\n");
> +
> + if (!WIFSTOPPED(status))
> + goto error;
> +
> + sig = WSTOPSIG(status);
> +
> + if (sig == SIGTRAP)
> + ksft_print_msg("Child received SIGTRAP\n");
> +
> + if (ptrace(PTRACE_GETSIGINFO, pid, NULL, &si)) {
> + if (errno == ESRCH)
> + goto disappeared;
> +
> + if (errno == EINVAL)
> + goto cont;
> +
> + ksft_test_result_fail("PTRACE_GETSIGINFO: %s\n",
> + strerror(errno));
> + goto error;
> + }
> +
> + if (sig == SIGSTOP && si.si_code == SI_TKILL &&
> + si.si_pid == pid)
> + break;
> +
> +cont:
> + /* bust group-stop */
> + if (ptrace(PTRACE_CONT, pid, NULL, 0)) {
> + if (errno == ESRCH)
> + goto disappeared;
> +
> + ksft_test_result_fail("PTRACE_CONT: %s\n",
> + strerror(errno));
> + goto error;
> + }
> + }
> +
> + ksft_print_msg("Parent is %d, child is %d\n", getpid(), child);
> +
> + ret = EXIT_SUCCESS;
> + run_tests(child);
> +
> +error:
> + kill(child, SIGKILL);
> +
> +disappeared:
> + return ret;
> +}
> --
> 2.39.2
>
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