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-rw-r--r--tools/testing/selftests/arm64/fp/sve-ptrace.c754
1 files changed, 754 insertions, 0 deletions
diff --git a/tools/testing/selftests/arm64/fp/sve-ptrace.c b/tools/testing/selftests/arm64/fp/sve-ptrace.c
new file mode 100644
index 000000000000..8c4847977583
--- /dev/null
+++ b/tools/testing/selftests/arm64/fp/sve-ptrace.c
@@ -0,0 +1,754 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2015-2021 ARM Limited.
+ * Original author: Dave Martin <Dave.Martin@arm.com>
+ */
+#include <errno.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/auxv.h>
+#include <sys/prctl.h>
+#include <sys/ptrace.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <sys/wait.h>
+#include <asm/sigcontext.h>
+#include <asm/ptrace.h>
+
+#include "../../kselftest.h"
+
+/* <linux/elf.h> and <sys/auxv.h> don't like each other, so: */
+#ifndef NT_ARM_SVE
+#define NT_ARM_SVE 0x405
+#endif
+
+#ifndef NT_ARM_SSVE
+#define NT_ARM_SSVE 0x40b
+#endif
+
+struct vec_type {
+ const char *name;
+ unsigned long hwcap_type;
+ unsigned long hwcap;
+ int regset;
+ int prctl_set;
+};
+
+static const struct vec_type vec_types[] = {
+ {
+ .name = "SVE",
+ .hwcap_type = AT_HWCAP,
+ .hwcap = HWCAP_SVE,
+ .regset = NT_ARM_SVE,
+ .prctl_set = PR_SVE_SET_VL,
+ },
+ {
+ .name = "Streaming SVE",
+ .hwcap_type = AT_HWCAP2,
+ .hwcap = HWCAP2_SME,
+ .regset = NT_ARM_SSVE,
+ .prctl_set = PR_SME_SET_VL,
+ },
+};
+
+#define VL_TESTS (((SVE_VQ_MAX - SVE_VQ_MIN) + 1) * 4)
+#define FLAG_TESTS 2
+#define FPSIMD_TESTS 2
+
+#define EXPECTED_TESTS ((VL_TESTS + FLAG_TESTS + FPSIMD_TESTS) * ARRAY_SIZE(vec_types))
+
+static void fill_buf(char *buf, size_t size)
+{
+ int i;
+
+ for (i = 0; i < size; i++)
+ buf[i] = random();
+}
+
+static int do_child(void)
+{
+ if (ptrace(PTRACE_TRACEME, -1, NULL, NULL))
+ ksft_exit_fail_msg("PTRACE_TRACEME", strerror(errno));
+
+ if (raise(SIGSTOP))
+ ksft_exit_fail_msg("raise(SIGSTOP)", strerror(errno));
+
+ return EXIT_SUCCESS;
+}
+
+static int get_fpsimd(pid_t pid, struct user_fpsimd_state *fpsimd)
+{
+ struct iovec iov;
+
+ iov.iov_base = fpsimd;
+ iov.iov_len = sizeof(*fpsimd);
+ return ptrace(PTRACE_GETREGSET, pid, NT_PRFPREG, &iov);
+}
+
+static int set_fpsimd(pid_t pid, struct user_fpsimd_state *fpsimd)
+{
+ struct iovec iov;
+
+ iov.iov_base = fpsimd;
+ iov.iov_len = sizeof(*fpsimd);
+ return ptrace(PTRACE_SETREGSET, pid, NT_PRFPREG, &iov);
+}
+
+static struct user_sve_header *get_sve(pid_t pid, const struct vec_type *type,
+ void **buf, size_t *size)
+{
+ struct user_sve_header *sve;
+ void *p;
+ size_t sz = sizeof *sve;
+ struct iovec iov;
+
+ while (1) {
+ if (*size < sz) {
+ p = realloc(*buf, sz);
+ if (!p) {
+ errno = ENOMEM;
+ goto error;
+ }
+
+ *buf = p;
+ *size = sz;
+ }
+
+ iov.iov_base = *buf;
+ iov.iov_len = sz;
+ if (ptrace(PTRACE_GETREGSET, pid, type->regset, &iov))
+ goto error;
+
+ sve = *buf;
+ if (sve->size <= sz)
+ break;
+
+ sz = sve->size;
+ }
+
+ return sve;
+
+error:
+ return NULL;
+}
+
+static int set_sve(pid_t pid, const struct vec_type *type,
+ const struct user_sve_header *sve)
+{
+ struct iovec iov;
+
+ iov.iov_base = (void *)sve;
+ iov.iov_len = sve->size;
+ return ptrace(PTRACE_SETREGSET, pid, type->regset, &iov);
+}
+
+/* Validate setting and getting the inherit flag */
+static void ptrace_set_get_inherit(pid_t child, const struct vec_type *type)
+{
+ struct user_sve_header sve;
+ struct user_sve_header *new_sve = NULL;
+ size_t new_sve_size = 0;
+ int ret;
+
+ /* First set the flag */
+ memset(&sve, 0, sizeof(sve));
+ sve.size = sizeof(sve);
+ sve.vl = sve_vl_from_vq(SVE_VQ_MIN);
+ sve.flags = SVE_PT_VL_INHERIT;
+ ret = set_sve(child, type, &sve);
+ if (ret != 0) {
+ ksft_test_result_fail("Failed to set %s SVE_PT_VL_INHERIT\n",
+ type->name);
+ return;
+ }
+
+ /*
+ * Read back the new register state and verify that we have
+ * set the flags we expected.
+ */
+ if (!get_sve(child, type, (void **)&new_sve, &new_sve_size)) {
+ ksft_test_result_fail("Failed to read %s SVE flags\n",
+ type->name);
+ return;
+ }
+
+ ksft_test_result(new_sve->flags & SVE_PT_VL_INHERIT,
+ "%s SVE_PT_VL_INHERIT set\n", type->name);
+
+ /* Now clear */
+ sve.flags &= ~SVE_PT_VL_INHERIT;
+ ret = set_sve(child, type, &sve);
+ if (ret != 0) {
+ ksft_test_result_fail("Failed to clear %s SVE_PT_VL_INHERIT\n",
+ type->name);
+ return;
+ }
+
+ if (!get_sve(child, type, (void **)&new_sve, &new_sve_size)) {
+ ksft_test_result_fail("Failed to read %s SVE flags\n",
+ type->name);
+ return;
+ }
+
+ ksft_test_result(!(new_sve->flags & SVE_PT_VL_INHERIT),
+ "%s SVE_PT_VL_INHERIT cleared\n", type->name);
+
+ free(new_sve);
+}
+
+/* Validate attempting to set the specfied VL via ptrace */
+static void ptrace_set_get_vl(pid_t child, const struct vec_type *type,
+ unsigned int vl, bool *supported)
+{
+ struct user_sve_header sve;
+ struct user_sve_header *new_sve = NULL;
+ size_t new_sve_size = 0;
+ int ret, prctl_vl;
+
+ *supported = false;
+
+ /* Check if the VL is supported in this process */
+ prctl_vl = prctl(type->prctl_set, vl);
+ if (prctl_vl == -1)
+ ksft_exit_fail_msg("prctl(PR_%s_SET_VL) failed: %s (%d)\n",
+ type->name, strerror(errno), errno);
+
+ /* If the VL is not supported then a supported VL will be returned */
+ *supported = (prctl_vl == vl);
+
+ /* Set the VL by doing a set with no register payload */
+ memset(&sve, 0, sizeof(sve));
+ sve.size = sizeof(sve);
+ sve.vl = vl;
+ ret = set_sve(child, type, &sve);
+ if (ret != 0) {
+ ksft_test_result_fail("Failed to set %s VL %u\n",
+ type->name, vl);
+ return;
+ }
+
+ /*
+ * Read back the new register state and verify that we have the
+ * same VL that we got from prctl() on ourselves.
+ */
+ if (!get_sve(child, type, (void **)&new_sve, &new_sve_size)) {
+ ksft_test_result_fail("Failed to read %s VL %u\n",
+ type->name, vl);
+ return;
+ }
+
+ ksft_test_result(new_sve->vl = prctl_vl, "Set %s VL %u\n",
+ type->name, vl);
+
+ free(new_sve);
+}
+
+static void check_u32(unsigned int vl, const char *reg,
+ uint32_t *in, uint32_t *out, int *errors)
+{
+ if (*in != *out) {
+ printf("# VL %d %s wrote %x read %x\n",
+ vl, reg, *in, *out);
+ (*errors)++;
+ }
+}
+
+/* Access the FPSIMD registers via the SVE regset */
+static void ptrace_sve_fpsimd(pid_t child, const struct vec_type *type)
+{
+ void *svebuf;
+ struct user_sve_header *sve;
+ struct user_fpsimd_state *fpsimd, new_fpsimd;
+ unsigned int i, j;
+ unsigned char *p;
+ int ret;
+
+ svebuf = malloc(SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD));
+ if (!svebuf) {
+ ksft_test_result_fail("Failed to allocate FPSIMD buffer\n");
+ return;
+ }
+
+ memset(svebuf, 0, SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD));
+ sve = svebuf;
+ sve->flags = SVE_PT_REGS_FPSIMD;
+ sve->size = SVE_PT_SIZE(0, SVE_PT_REGS_FPSIMD);
+ sve->vl = 16; /* We don't care what the VL is */
+
+ /* Try to set a known FPSIMD state via PT_REGS_SVE */
+ fpsimd = (struct user_fpsimd_state *)((char *)sve +
+ SVE_PT_FPSIMD_OFFSET);
+ for (i = 0; i < 32; ++i) {
+ p = (unsigned char *)&fpsimd->vregs[i];
+
+ for (j = 0; j < sizeof(fpsimd->vregs[i]); ++j)
+ p[j] = j;
+ }
+
+ ret = set_sve(child, type, sve);
+ ksft_test_result(ret == 0, "%s FPSIMD set via SVE: %d\n",
+ type->name, ret);
+ if (ret)
+ goto out;
+
+ /* Verify via the FPSIMD regset */
+ if (get_fpsimd(child, &new_fpsimd)) {
+ ksft_test_result_fail("get_fpsimd(): %s\n",
+ strerror(errno));
+ goto out;
+ }
+ if (memcmp(fpsimd, &new_fpsimd, sizeof(*fpsimd)) == 0)
+ ksft_test_result_pass("%s get_fpsimd() gave same state\n",
+ type->name);
+ else
+ ksft_test_result_fail("%s get_fpsimd() gave different state\n",
+ type->name);
+
+out:
+ free(svebuf);
+}
+
+/* Validate attempting to set SVE data and read SVE data */
+static void ptrace_set_sve_get_sve_data(pid_t child,
+ const struct vec_type *type,
+ unsigned int vl)
+{
+ void *write_buf;
+ void *read_buf = NULL;
+ struct user_sve_header *write_sve;
+ struct user_sve_header *read_sve;
+ size_t read_sve_size = 0;
+ unsigned int vq = sve_vq_from_vl(vl);
+ int ret, i;
+ size_t data_size;
+ int errors = 0;
+
+ data_size = SVE_PT_SVE_OFFSET + SVE_PT_SVE_SIZE(vq, SVE_PT_REGS_SVE);
+ write_buf = malloc(data_size);
+ if (!write_buf) {
+ ksft_test_result_fail("Error allocating %d byte buffer for %s VL %u\n",
+ data_size, type->name, vl);
+ return;
+ }
+ write_sve = write_buf;
+
+ /* Set up some data and write it out */
+ memset(write_sve, 0, data_size);
+ write_sve->size = data_size;
+ write_sve->vl = vl;
+ write_sve->flags = SVE_PT_REGS_SVE;
+
+ for (i = 0; i < __SVE_NUM_ZREGS; i++)
+ fill_buf(write_buf + SVE_PT_SVE_ZREG_OFFSET(vq, i),
+ SVE_PT_SVE_ZREG_SIZE(vq));
+
+ for (i = 0; i < __SVE_NUM_PREGS; i++)
+ fill_buf(write_buf + SVE_PT_SVE_PREG_OFFSET(vq, i),
+ SVE_PT_SVE_PREG_SIZE(vq));
+
+ fill_buf(write_buf + SVE_PT_SVE_FPSR_OFFSET(vq), SVE_PT_SVE_FPSR_SIZE);
+ fill_buf(write_buf + SVE_PT_SVE_FPCR_OFFSET(vq), SVE_PT_SVE_FPCR_SIZE);
+
+ /* TODO: Generate a valid FFR pattern */
+
+ ret = set_sve(child, type, write_sve);
+ if (ret != 0) {
+ ksft_test_result_fail("Failed to set %s VL %u data\n",
+ type->name, vl);
+ goto out;
+ }
+
+ /* Read the data back */
+ if (!get_sve(child, type, (void **)&read_buf, &read_sve_size)) {
+ ksft_test_result_fail("Failed to read %s VL %u data\n",
+ type->name, vl);
+ goto out;
+ }
+ read_sve = read_buf;
+
+ /* We might read more data if there's extensions we don't know */
+ if (read_sve->size < write_sve->size) {
+ ksft_test_result_fail("%s wrote %d bytes, only read %d\n",
+ type->name, write_sve->size,
+ read_sve->size);
+ goto out_read;
+ }
+
+ for (i = 0; i < __SVE_NUM_ZREGS; i++) {
+ if (memcmp(write_buf + SVE_PT_SVE_ZREG_OFFSET(vq, i),
+ read_buf + SVE_PT_SVE_ZREG_OFFSET(vq, i),
+ SVE_PT_SVE_ZREG_SIZE(vq)) != 0) {
+ printf("# Mismatch in %u Z%d\n", vl, i);
+ errors++;
+ }
+ }
+
+ for (i = 0; i < __SVE_NUM_PREGS; i++) {
+ if (memcmp(write_buf + SVE_PT_SVE_PREG_OFFSET(vq, i),
+ read_buf + SVE_PT_SVE_PREG_OFFSET(vq, i),
+ SVE_PT_SVE_PREG_SIZE(vq)) != 0) {
+ printf("# Mismatch in %u P%d\n", vl, i);
+ errors++;
+ }
+ }
+
+ check_u32(vl, "FPSR", write_buf + SVE_PT_SVE_FPSR_OFFSET(vq),
+ read_buf + SVE_PT_SVE_FPSR_OFFSET(vq), &errors);
+ check_u32(vl, "FPCR", write_buf + SVE_PT_SVE_FPCR_OFFSET(vq),
+ read_buf + SVE_PT_SVE_FPCR_OFFSET(vq), &errors);
+
+ ksft_test_result(errors == 0, "Set and get %s data for VL %u\n",
+ type->name, vl);
+
+out_read:
+ free(read_buf);
+out:
+ free(write_buf);
+}
+
+/* Validate attempting to set SVE data and read it via the FPSIMD regset */
+static void ptrace_set_sve_get_fpsimd_data(pid_t child,
+ const struct vec_type *type,
+ unsigned int vl)
+{
+ void *write_buf;
+ struct user_sve_header *write_sve;
+ unsigned int vq = sve_vq_from_vl(vl);
+ struct user_fpsimd_state fpsimd_state;
+ int ret, i;
+ size_t data_size;
+ int errors = 0;
+
+ if (__BYTE_ORDER == __BIG_ENDIAN) {
+ ksft_test_result_skip("Big endian not supported\n");
+ return;
+ }
+
+ data_size = SVE_PT_SVE_OFFSET + SVE_PT_SVE_SIZE(vq, SVE_PT_REGS_SVE);
+ write_buf = malloc(data_size);
+ if (!write_buf) {
+ ksft_test_result_fail("Error allocating %d byte buffer for %s VL %u\n",
+ data_size, type->name, vl);
+ return;
+ }
+ write_sve = write_buf;
+
+ /* Set up some data and write it out */
+ memset(write_sve, 0, data_size);
+ write_sve->size = data_size;
+ write_sve->vl = vl;
+ write_sve->flags = SVE_PT_REGS_SVE;
+
+ for (i = 0; i < __SVE_NUM_ZREGS; i++)
+ fill_buf(write_buf + SVE_PT_SVE_ZREG_OFFSET(vq, i),
+ SVE_PT_SVE_ZREG_SIZE(vq));
+
+ fill_buf(write_buf + SVE_PT_SVE_FPSR_OFFSET(vq), SVE_PT_SVE_FPSR_SIZE);
+ fill_buf(write_buf + SVE_PT_SVE_FPCR_OFFSET(vq), SVE_PT_SVE_FPCR_SIZE);
+
+ ret = set_sve(child, type, write_sve);
+ if (ret != 0) {
+ ksft_test_result_fail("Failed to set %s VL %u data\n",
+ type->name, vl);
+ goto out;
+ }
+
+ /* Read the data back */
+ if (get_fpsimd(child, &fpsimd_state)) {
+ ksft_test_result_fail("Failed to read %s VL %u FPSIMD data\n",
+ type->name, vl);
+ goto out;
+ }
+
+ for (i = 0; i < __SVE_NUM_ZREGS; i++) {
+ __uint128_t tmp = 0;
+
+ /*
+ * Z regs are stored endianness invariant, this won't
+ * work for big endian
+ */
+ memcpy(&tmp, write_buf + SVE_PT_SVE_ZREG_OFFSET(vq, i),
+ sizeof(tmp));
+
+ if (tmp != fpsimd_state.vregs[i]) {
+ printf("# Mismatch in FPSIMD for %s VL %u Z%d\n",
+ type->name, vl, i);
+ errors++;
+ }
+ }
+
+ check_u32(vl, "FPSR", write_buf + SVE_PT_SVE_FPSR_OFFSET(vq),
+ &fpsimd_state.fpsr, &errors);
+ check_u32(vl, "FPCR", write_buf + SVE_PT_SVE_FPCR_OFFSET(vq),
+ &fpsimd_state.fpcr, &errors);
+
+ ksft_test_result(errors == 0, "Set and get FPSIMD data for %s VL %u\n",
+ type->name, vl);
+
+out:
+ free(write_buf);
+}
+
+/* Validate attempting to set FPSIMD data and read it via the SVE regset */
+static void ptrace_set_fpsimd_get_sve_data(pid_t child,
+ const struct vec_type *type,
+ unsigned int vl)
+{
+ void *read_buf = NULL;
+ unsigned char *p;
+ struct user_sve_header *read_sve;
+ unsigned int vq = sve_vq_from_vl(vl);
+ struct user_fpsimd_state write_fpsimd;
+ int ret, i, j;
+ size_t read_sve_size = 0;
+ size_t expected_size;
+ int errors = 0;
+
+ if (__BYTE_ORDER == __BIG_ENDIAN) {
+ ksft_test_result_skip("Big endian not supported\n");
+ return;
+ }
+
+ for (i = 0; i < 32; ++i) {
+ p = (unsigned char *)&write_fpsimd.vregs[i];
+
+ for (j = 0; j < sizeof(write_fpsimd.vregs[i]); ++j)
+ p[j] = j;
+ }
+
+ ret = set_fpsimd(child, &write_fpsimd);
+ if (ret != 0) {
+ ksft_test_result_fail("Failed to set FPSIMD state: %d\n)",
+ ret);
+ return;
+ }
+
+ if (!get_sve(child, type, (void **)&read_buf, &read_sve_size)) {
+ ksft_test_result_fail("Failed to read %s VL %u data\n",
+ type->name, vl);
+ return;
+ }
+ read_sve = read_buf;
+
+ if (read_sve->vl != vl) {
+ ksft_test_result_fail("Child VL != expected VL %d\n",
+ read_sve->vl, vl);
+ goto out;
+ }
+
+ /* The kernel may return either SVE or FPSIMD format */
+ switch (read_sve->flags & SVE_PT_REGS_MASK) {
+ case SVE_PT_REGS_FPSIMD:
+ expected_size = SVE_PT_FPSIMD_SIZE(vq, SVE_PT_REGS_FPSIMD);
+ if (read_sve_size < expected_size) {
+ ksft_test_result_fail("Read %d bytes, expected %d\n",
+ read_sve_size, expected_size);
+ goto out;
+ }
+
+ ret = memcmp(&write_fpsimd, read_buf + SVE_PT_FPSIMD_OFFSET,
+ sizeof(write_fpsimd));
+ if (ret != 0) {
+ ksft_print_msg("Read FPSIMD data mismatch\n");
+ errors++;
+ }
+ break;
+
+ case SVE_PT_REGS_SVE:
+ expected_size = SVE_PT_SVE_SIZE(vq, SVE_PT_REGS_SVE);
+ if (read_sve_size < expected_size) {
+ ksft_test_result_fail("Read %d bytes, expected %d\n",
+ read_sve_size, expected_size);
+ goto out;
+ }
+
+ for (i = 0; i < __SVE_NUM_ZREGS; i++) {
+ __uint128_t tmp = 0;
+
+ /*
+ * Z regs are stored endianness invariant, this won't
+ * work for big endian
+ */
+ memcpy(&tmp, read_buf + SVE_PT_SVE_ZREG_OFFSET(vq, i),
+ sizeof(tmp));
+
+ if (tmp != write_fpsimd.vregs[i]) {
+ ksft_print_msg("Mismatch in FPSIMD for %s VL %u Z%d/V%d\n",
+ type->name, vl, i, i);
+ errors++;
+ }
+ }
+
+ check_u32(vl, "FPSR", &write_fpsimd.fpsr,
+ read_buf + SVE_PT_SVE_FPSR_OFFSET(vq), &errors);
+ check_u32(vl, "FPCR", &write_fpsimd.fpcr,
+ read_buf + SVE_PT_SVE_FPCR_OFFSET(vq), &errors);
+ break;
+ default:
+ ksft_print_msg("Unexpected regs type %d\n",
+ read_sve->flags & SVE_PT_REGS_MASK);
+ errors++;
+ break;
+ }
+
+ ksft_test_result(errors == 0, "Set FPSIMD, read via SVE for %s VL %u\n",
+ type->name, vl);
+
+out:
+ free(read_buf);
+}
+
+static int do_parent(pid_t child)
+{
+ int ret = EXIT_FAILURE;
+ pid_t pid;
+ int status, i;
+ siginfo_t si;
+ unsigned int vq, vl;
+ bool vl_supported;
+
+ ksft_print_msg("Parent is %d, child is %d\n", getpid(), child);
+
+ /* 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 (ptrace(PTRACE_GETSIGINFO, pid, NULL, &si)) {
+ if (errno == ESRCH)
+ goto disappeared;
+
+ if (errno == EINVAL) {
+ sig = 0; /* bust group-stop */
+ 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:
+ if (ptrace(PTRACE_CONT, pid, NULL, sig)) {
+ if (errno == ESRCH)
+ goto disappeared;
+
+ ksft_test_result_fail("PTRACE_CONT: %s\n",
+ strerror(errno));
+ goto error;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(vec_types); i++) {
+ /* FPSIMD via SVE regset */
+ if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) {
+ ptrace_sve_fpsimd(child, &vec_types[i]);
+ } else {
+ ksft_test_result_skip("%s FPSIMD set via SVE\n",
+ vec_types[i].name);
+ ksft_test_result_skip("%s FPSIMD read\n",
+ vec_types[i].name);
+ }
+
+ /* prctl() flags */
+ if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) {
+ ptrace_set_get_inherit(child, &vec_types[i]);
+ } else {
+ ksft_test_result_skip("%s SVE_PT_VL_INHERIT set\n",
+ vec_types[i].name);
+ ksft_test_result_skip("%s SVE_PT_VL_INHERIT cleared\n",
+ vec_types[i].name);
+ }
+
+ /* Step through every possible VQ */
+ for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; vq++) {
+ vl = sve_vl_from_vq(vq);
+
+ /* First, try to set this vector length */
+ if (getauxval(vec_types[i].hwcap_type) &
+ vec_types[i].hwcap) {
+ ptrace_set_get_vl(child, &vec_types[i], vl,
+ &vl_supported);
+ } else {
+ ksft_test_result_skip("%s get/set VL %d\n",
+ vec_types[i].name, vl);
+ vl_supported = false;
+ }
+
+ /* If the VL is supported validate data set/get */
+ if (vl_supported) {
+ ptrace_set_sve_get_sve_data(child, &vec_types[i], vl);
+ ptrace_set_sve_get_fpsimd_data(child, &vec_types[i], vl);
+ ptrace_set_fpsimd_get_sve_data(child, &vec_types[i], vl);
+ } else {
+ ksft_test_result_skip("%s set SVE get SVE for VL %d\n",
+ vec_types[i].name, vl);
+ ksft_test_result_skip("%s set SVE get FPSIMD for VL %d\n",
+ vec_types[i].name, vl);
+ ksft_test_result_skip("%s set FPSIMD get SVE for VL %d\n",
+ vec_types[i].name, vl);
+ }
+ }
+ }
+
+ ret = EXIT_SUCCESS;
+
+error:
+ kill(child, SIGKILL);
+
+disappeared:
+ return ret;
+}
+
+int main(void)
+{
+ int ret = EXIT_SUCCESS;
+ pid_t child;
+
+ srandom(getpid());
+
+ ksft_print_header();
+ ksft_set_plan(EXPECTED_TESTS);
+
+ if (!(getauxval(AT_HWCAP) & HWCAP_SVE))
+ ksft_exit_skip("SVE not available\n");
+
+ child = fork();
+ if (!child)
+ return do_child();
+
+ if (do_parent(child))
+ ret = EXIT_FAILURE;
+
+ ksft_print_cnts();
+
+ return ret;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.