@@ -18,7 +18,7 @@ TARGETS_C_32BIT_ONLY := entry_from_vm86 test_syscall_vdso unwind_vdso \
test_FCMOV test_FCOMI test_FISTTP \
vdso_restorer
TARGETS_C_64BIT_ONLY := fsgsbase sysret_rip syscall_numbering \
- corrupt_xstate_header
+ corrupt_xstate_header amx
# Some selftests require 32bit support enabled also on 64bit systems
TARGETS_C_32BIT_NEEDED := ldt_gdt ptrace_syscall
new file mode 100644
@@ -0,0 +1,968 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+#include <err.h>
+#include <errno.h>
+#include <elf.h>
+#include <pthread.h>
+#include <setjmp.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <x86intrin.h>
+
+#include <linux/futex.h>
+
+#include <sys/ptrace.h>
+#include <sys/shm.h>
+#include <sys/syscall.h>
+#include <sys/wait.h>
+#include <sys/uio.h>
+
+#ifndef __x86_64__
+# error This test is 64-bit only
+#endif
+
+static inline uint64_t xgetbv(uint32_t index)
+{
+ uint32_t eax, edx;
+
+ asm volatile("xgetbv;"
+ : "=a" (eax), "=d" (edx)
+ : "c" (index));
+ return eax + ((uint64_t)edx << 32);
+}
+
+static inline void cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
+{
+ asm volatile("cpuid;"
+ : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
+ : "0" (*eax), "2" (*ecx));
+}
+
+static inline void xsave(void *xbuf, uint32_t lo, uint32_t hi)
+{
+ asm volatile("xsave (%%rdi)"
+ : : "D" (xbuf), "a" (lo), "d" (hi)
+ : "memory");
+}
+
+static inline void xrstor(void *xbuf, uint32_t lo, uint32_t hi)
+{
+ asm volatile("xrstor (%%rdi)"
+ : : "D" (xbuf), "a" (lo), "d" (hi));
+}
+
+static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
+ int flags)
+{
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_sigaction = handler;
+ sa.sa_flags = SA_SIGINFO | flags;
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(sig, &sa, 0))
+ err(1, "sigaction");
+}
+
+static void clearhandler(int sig)
+{
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = SIG_DFL;
+ sigemptyset(&sa.sa_mask);
+ if (sigaction(sig, &sa, 0))
+ err(1, "sigaction");
+}
+
+static jmp_buf jmpbuf;
+
+/* Hardware info check: */
+
+static bool noxsave;
+
+static void handle_noxsave(int sig, siginfo_t *si, void *ctx_void)
+{
+ noxsave = true;
+ siglongjmp(jmpbuf, 1);
+}
+
+#define XFEATURE_XTILECFG 17
+#define XFEATURE_XTILEDATA 18
+#define XFEATURE_MASK_XTILECFG (1 << XFEATURE_XTILECFG)
+#define XFEATURE_MASK_XTILEDATA (1 << XFEATURE_XTILEDATA)
+#define XFEATURE_MASK_XTILE (XFEATURE_MASK_XTILECFG | XFEATURE_MASK_XTILEDATA)
+
+static inline bool check_xtile(void)
+{
+ bool xtile_enable;
+
+ sethandler(SIGILL, handle_noxsave, 0);
+
+ if ((!sigsetjmp(jmpbuf, 1)) && (xgetbv(0) & XFEATURE_MASK_XTILE)) {
+ xtile_enable = true;
+ goto out;
+ }
+ xtile_enable = false;
+out:
+ clearhandler(SIGILL);
+ return xtile_enable;
+}
+
+static uint32_t xsave_size;
+static uint32_t xsave_xtiledata_offset, xsave_xtilecfg_offset;
+static uint32_t xtiledata_size, xtilecfg_size;
+
+static struct _tile_spec {
+ uint16_t bytes_per_row;
+ uint16_t max_names;
+ uint16_t max_rows;
+} tile_spec;
+
+#define XSTATE_CPUID 0xd
+#define XSTATE_USER_STATE_SUBLEAVE 0x0
+#define TILE_CPUID 0x1d
+#define TILE_PALETTE_ID 0x1
+
+static void check_cpuid(void)
+{
+ uint32_t eax, ebx, ecx, edx;
+
+ eax = XSTATE_CPUID;
+ ecx = XSTATE_USER_STATE_SUBLEAVE;
+
+ cpuid(&eax, &ebx, &ecx, &edx);
+ if (!ebx)
+ err(1, "xstate cpuid: xsave size");
+
+ xsave_size = ebx;
+
+ eax = XSTATE_CPUID;
+ ecx = XFEATURE_XTILECFG;
+
+ cpuid(&eax, &ebx, &ecx, &edx);
+ if (!eax || !ebx)
+ err(1, "xstate cpuid: tile config state");
+
+ xtilecfg_size = eax;
+ xsave_xtilecfg_offset = ebx;
+
+ eax = XSTATE_CPUID;
+ ecx = XFEATURE_XTILEDATA;
+
+ cpuid(&eax, &ebx, &ecx, &edx);
+ if (!eax || !ebx)
+ err(1, "xstate cpuid: tile data state");
+
+ xtiledata_size = eax;
+ xsave_xtiledata_offset = ebx;
+
+ eax = TILE_CPUID;
+ ecx = TILE_PALETTE_ID;
+
+ cpuid(&eax, &ebx, &ecx, &edx);
+ if (!eax || !ebx || !ecx)
+ err(1, "tile cpuid: palette 1");
+
+ tile_spec.max_names = ebx >> 16;
+ tile_spec.bytes_per_row = ebx;
+ tile_spec.max_rows = ecx;
+}
+
+/* The helpers for managing XSAVE buffer and tile states: */
+
+void *alloc_xsave_buffer(void)
+{
+ void *xbuf;
+
+ /* XSAVE buffer should be 64B-aligned. */
+ xbuf = aligned_alloc(64, xsave_size);
+ if (!xbuf)
+ err(1, "aligned_alloc()");
+ return xbuf;
+}
+
+#define XSAVE_HDR_OFFSET 512
+#define XSAVE_HDR_SIZE 64
+
+static inline void clear_xstate_header(void *buffer)
+{
+ memset(buffer + XSAVE_HDR_OFFSET, 0, XSAVE_HDR_SIZE);
+}
+
+static inline uint64_t get_xstatebv(void *buffer)
+{
+ return *(uint64_t *)(buffer + XSAVE_HDR_OFFSET);
+}
+
+static inline void set_xstatebv(void *buffer, uint64_t bv)
+{
+ *(uint64_t *)(buffer + XSAVE_HDR_OFFSET) = bv;
+}
+
+static void set_rand_tiledata(void *tiledata)
+{
+ int *ptr = tiledata;
+ int data = rand();
+ int i;
+
+ for (i = 0; i < xtiledata_size / sizeof(int); i++, ptr++)
+ *ptr = data;
+}
+
+#define MAX_TILES 16
+#define RESERVED_BYTES 14
+
+struct tile_config {
+ uint8_t palette_id;
+ uint8_t start_row;
+ uint8_t reserved[RESERVED_BYTES];
+ uint16_t colsb[MAX_TILES];
+ uint8_t rows[MAX_TILES];
+};
+
+static void set_tilecfg(void *tilecfg)
+{
+ struct tile_config *cfg = tilecfg;
+ int i;
+
+ memset(cfg, 0, sizeof(*cfg));
+ cfg->palette_id = TILE_PALETTE_ID;
+ for (i = 0; i < tile_spec.max_names; i++) {
+ cfg->colsb[i] = tile_spec.bytes_per_row;
+ cfg->rows[i] = tile_spec.max_rows;
+ }
+}
+
+static void *xsave_buffer, *tiledata, *tilecfg;
+static int nerrs, errs;
+
+/* See 'struct _fpx_sw_bytes' at sigcontext.h */
+#define SW_BYTES_OFFSET 464
+/* N.B. The struct's field name varies so read from the offset. */
+#define SW_BYTES_BV_OFFSET (SW_BYTES_OFFSET + 8)
+
+static inline struct _fpx_sw_bytes *get_fpx_sw_bytes(void *buffer)
+{
+ return (struct _fpx_sw_bytes *)(buffer + SW_BYTES_OFFSET);
+}
+
+static inline uint64_t get_fpx_sw_bytes_xstatebv(void *buffer)
+{
+ return *(uint64_t *)(buffer + SW_BYTES_BV_OFFSET);
+}
+
+static volatile bool noperm;
+static bool check_tilecfg_sigframe;
+
+static void handle_noperm(int sig, siginfo_t *si, void *ctx_void)
+{
+ ucontext_t *ctx = (ucontext_t *)ctx_void;
+ void *xbuf = ctx->uc_mcontext.fpregs;
+ struct _fpx_sw_bytes *sw_bytes;
+
+ printf("\tAt SIGILL handler,\n");
+
+ if (si->si_code != ILL_ILLOPC) {
+ errs++;
+ printf("[FAIL]\tInvalid signal code (%x).\n", si->si_code);
+ } else {
+ printf("[OK]\tValid signal code (ILL_ILLOPC).\n");
+ }
+
+ sw_bytes = get_fpx_sw_bytes(xbuf);
+ if (!(sw_bytes->xstate_size < xsave_xtiledata_offset) &&
+ !(get_fpx_sw_bytes_xstatebv(xbuf) & XFEATURE_MASK_XTILEDATA)) {
+ printf("[OK]\tValid xstate size and mask in the SW data of xstate buffer.\n");
+ } else {
+ errs++;
+ printf("[FAIL]\tInvalid xstate size and/or mask in the SW data of xstate buf.\n");
+ }
+
+ if (check_tilecfg_sigframe) {
+ if (memcmp(tilecfg, xbuf + xsave_xtilecfg_offset, xtilecfg_size)) {
+ errs++;
+ printf("[FAIL]\tTILECFG is corrupted.\n");
+ } else {
+ printf("[OK]\tTILECFG is successfully delivered.\n");
+ }
+ }
+
+ noperm = true;
+ ctx->uc_mcontext.gregs[REG_RIP] += 3; /* Skip the faulting XRSTOR */
+}
+
+/* Return true if XRSTOR is successful; otherwise, false. */
+static inline bool xrstor_safe(void *buffer, uint32_t lo, uint32_t hi)
+{
+ noperm = false;
+ xrstor(buffer, lo, hi);
+ return !noperm;
+}
+
+/* arch_prctl test */
+
+#define ARCH_SET_STATE_ENABLE 0x1021
+#define ARCH_GET_STATE_ENABLE 0x1022
+
+static void enable_tiledata(void)
+{
+ unsigned long bitmask;
+ long rc;
+
+ rc = syscall(SYS_arch_prctl, ARCH_SET_STATE_ENABLE, XFEATURE_MASK_XTILEDATA);
+ if (rc)
+ goto fail;
+
+ rc = syscall(SYS_arch_prctl, ARCH_GET_STATE_ENABLE, &bitmask);
+ if (rc)
+ err(1, "ARCH_GET_STATE_ENABLE");
+ else if (bitmask & XFEATURE_MASK_XTILEDATA)
+ return;
+
+fail:
+ err(1, "ARCH_SET_STATE_ENABLE");
+}
+
+#define TEST_EXECV_ARG "nested"
+
+static void test_arch_prctl(int argc, char **argv)
+{
+ pid_t parent, child, grandchild;
+
+ parent = fork();
+ if (parent < 0) {
+ err(1, "fork");
+ } else if (parent > 0) {
+ int status;
+
+ wait(&status);
+ if (!WIFEXITED(status) || WEXITSTATUS(status))
+ err(1, "arch_prctl test parent exit");
+ return;
+ }
+
+ printf("[RUN]\tCheck ARCH_SET_STATE_ENABLE around process fork().\n");
+
+ printf("\tFork a child.\n");
+ child = fork();
+ if (child < 0) {
+ err(1, "fork");
+ } else if (child > 0) {
+ int status;
+
+ enable_tiledata();
+ printf("\tDo ARCH_SET_STATE_ENABLE at parent\n");
+
+ wait(&status);
+ if (!WIFEXITED(status) || WEXITSTATUS(status))
+ err(1, "arch_prctl test child exit");
+ _exit(0);
+ }
+
+ clear_xstate_header(xsave_buffer);
+
+ /* By default, XTILECFG is permitted to use. */
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILECFG);
+ set_tilecfg(xsave_buffer + xsave_xtilecfg_offset);
+ xrstor(xsave_buffer, -1, -1);
+ memcpy(tilecfg, xsave_buffer + xsave_xtilecfg_offset, xtilecfg_size);
+
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILEDATA);
+ set_rand_tiledata(xsave_buffer + xsave_xtiledata_offset);
+
+ printf("\tLoad tile data without ARCH_SET_STATE_ENABLE at child.\n");
+ /*
+ * Test XTILECFG state delivery via signal, when XTILEDATA is not
+ * permitted.
+ */
+ check_tilecfg_sigframe = true;
+ if (xrstor_safe(xsave_buffer, -1, -1)) {
+ nerrs++;
+ printf("[FAIL]\tSucceeded at child.\n");
+ } else {
+ printf("[OK]\tBlocked at child.\n");
+
+ /* Assure XTILECFG state recovery at sigreturn. */
+ printf("\tReturn from signal handler,\n");
+ xsave(xsave_buffer, XFEATURE_MASK_XTILECFG, 0);
+ if (memcmp(tilecfg, xsave_buffer + xsave_xtilecfg_offset, xtilecfg_size)) {
+ nerrs++;
+ printf("[FAIL]\tTilecfg is not restored.\n");
+ } else {
+ printf("[OK]\tTilecfg is restored.\n");
+ }
+ }
+
+ printf("\tDo ARCH_SET_STATE_ENABLE at child.\n");
+ enable_tiledata();
+
+ printf("\tLoad tile data with ARCH_SET_STATE_ENABLE at child:\n");
+ check_tilecfg_sigframe = false;
+ if (xrstor_safe(xsave_buffer, -1, -1)) {
+ printf("[OK]\tSucceeded at child.\n");
+ } else {
+ nerrs++;
+ printf("[FAIL]\tBlocked at child.\n");
+ }
+
+ printf("\tFork a grandchild.\n");
+ grandchild = fork();
+ if (grandchild < 0) {
+ err(1, "fork");
+ } else if (!grandchild) {
+ char *args[] = {argv[0], TEST_EXECV_ARG, NULL};
+
+ if (xrstor_safe(xsave_buffer, -1, -1)) {
+ printf("[OK]\tSucceeded at grandchild.\n");
+ } else {
+ nerrs++;
+ printf("[FAIL]\tBlocked at grandchild.\n");
+ }
+ nerrs += execv(args[0], args);
+ } else {
+ int status;
+
+ wait(&status);
+ if (!WIFEXITED(status) || WEXITSTATUS(status))
+ err(1, "fork test grandchild");
+ }
+ _exit(0);
+}
+
+/* Testing tile data inheritance */
+
+static void test_fork(void)
+{
+ pid_t child, grandchild;
+
+ child = fork();
+ if (child < 0) {
+ err(1, "fork");
+ } else if (child > 0) {
+ int status;
+
+ wait(&status);
+ if (!WIFEXITED(status) || WEXITSTATUS(status))
+ err(1, "fork test child");
+ return;
+ }
+
+ printf("[RUN]\tCheck tile data inheritance.\n\tBefore fork(), load tile data -- yes:\n");
+
+ clear_xstate_header(xsave_buffer);
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILE);
+ set_tilecfg(xsave_buffer + xsave_xtilecfg_offset);
+ set_rand_tiledata(xsave_buffer + xsave_xtiledata_offset);
+ xrstor_safe(xsave_buffer, -1, -1);
+
+ grandchild = fork();
+ if (grandchild < 0) {
+ err(1, "fork");
+ } else if (grandchild > 0) {
+ int status;
+
+ wait(&status);
+ if (!WIFEXITED(status) || WEXITSTATUS(status))
+ err(1, "fork test grand child");
+ _exit(0);
+ }
+
+ if (xgetbv(1) & XFEATURE_MASK_XTILE) {
+ nerrs++;
+ printf("[FAIL]\tIn a child, AMX state is not initialized.\n");
+ } else {
+ printf("[OK]\tIn a child, AMX state is initialized.\n");
+ }
+ _exit(0);
+}
+
+/* Context switching test */
+
+#define ITERATIONS 10
+#define NUM_THREADS 5
+
+struct futex_info {
+ int current;
+ int *futex;
+ int next;
+};
+
+static inline void command_wait(struct futex_info *info, int value)
+{
+ do {
+ sched_yield();
+ } while (syscall(SYS_futex, info->futex, FUTEX_WAIT, value, 0, 0, 0));
+}
+
+static inline void command_wake(struct futex_info *info, int value)
+{
+ do {
+ *info->futex = value;
+ while (!syscall(SYS_futex, info->futex, FUTEX_WAKE, 1, 0, 0, 0))
+ sched_yield();
+ } while (0);
+}
+
+static inline int get_iterative_value(int id)
+{
+ return ((id << 1) & ~0x1);
+}
+
+static inline int get_endpoint_value(int id)
+{
+ return ((id << 1) | 0x1);
+}
+
+static void *check_tiledata(void *info)
+{
+ struct futex_info *finfo = (struct futex_info *)info;
+ void *xbuf, *tdata;
+ int i;
+
+ xbuf = alloc_xsave_buffer();
+ tdata = malloc(xtiledata_size);
+ if (!tdata)
+ err(1, "malloc()");
+
+ set_xstatebv(xbuf, XFEATURE_MASK_XTILEDATA);
+ set_rand_tiledata(xbuf + xsave_xtiledata_offset);
+ xrstor_safe(xbuf, -1, -1);
+ memcpy(tdata, xbuf + xsave_xtiledata_offset, xtiledata_size);
+
+ for (i = 0; i < ITERATIONS; i++) {
+ command_wait(finfo, get_iterative_value(finfo->current));
+
+ xsave(xbuf, XFEATURE_MASK_XTILEDATA, 0);
+ if (memcmp(tdata, xbuf + xsave_xtiledata_offset, xtiledata_size))
+ errs++;
+
+ set_rand_tiledata(xbuf + xsave_xtiledata_offset);
+ xrstor_safe(xbuf, -1, -1);
+ memcpy(tdata, xbuf + xsave_xtiledata_offset, xtiledata_size);
+
+ command_wake(finfo, get_iterative_value(finfo->next));
+ }
+
+ command_wait(finfo, get_endpoint_value(finfo->current));
+
+ free(xbuf);
+ free(tdata);
+ return NULL;
+}
+
+static int create_threads(int num, struct futex_info *finfo)
+{
+ const int shm_id = shmget(IPC_PRIVATE, sizeof(int), IPC_CREAT | 0666);
+ int *futex = shmat(shm_id, NULL, 0);
+ pthread_t thread;
+ int i;
+
+ for (i = 0; i < num; i++) {
+ finfo[i].futex = futex;
+ finfo[i].current = i + 1;
+ finfo[i].next = (i + 2) % (num + 1);
+
+ if (pthread_create(&thread, NULL, check_tiledata, &finfo[i]))
+ err(1, "pthread_create()");
+ }
+ return 0;
+}
+
+static void test_context_switch(void)
+{
+ struct futex_info *finfo;
+ int i;
+
+ printf("[RUN]\tCheck tile data context switches.\n");
+ printf("\t# of context switches -- %u, # of threads -- %d:\n",
+ ITERATIONS * NUM_THREADS, NUM_THREADS);
+
+ errs = 0;
+
+ finfo = malloc(sizeof(*finfo) * NUM_THREADS);
+ if (!finfo)
+ err(1, "malloc()");
+
+ create_threads(NUM_THREADS, finfo);
+
+ for (i = 0; i < ITERATIONS; i++) {
+ command_wake(finfo, get_iterative_value(1));
+ command_wait(finfo, get_iterative_value(0));
+ }
+
+ for (i = 1; i <= NUM_THREADS; i++)
+ command_wake(finfo, get_endpoint_value(i));
+
+ if (errs) {
+ nerrs += errs;
+ printf("[FAIL]\tIncorrect cases were found -- (%d / %u).\n",
+ errs, ITERATIONS * NUM_THREADS);
+ } else {
+ printf("[OK]\tNo incorrect case was found.\n");
+ }
+
+ free(finfo);
+}
+
+/* Ptrace test */
+
+static bool ptracee_state_perm;
+
+static int inject_tiledata(pid_t target)
+{
+ struct iovec iov;
+
+ iov.iov_base = xsave_buffer;
+ iov.iov_len = xsave_size;
+
+ clear_xstate_header(xsave_buffer);
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILEDATA);
+ set_rand_tiledata(xsave_buffer + xsave_xtiledata_offset);
+ memcpy(tiledata, xsave_buffer + xsave_xtiledata_offset, xtiledata_size);
+
+ if (ptrace(PTRACE_SETREGSET, target, (uint32_t)NT_X86_XSTATE, &iov)) {
+ if (errno != EFAULT)
+ err(1, "PTRACE_SETREGSET");
+ else
+ return errno;
+ }
+
+ if (ptrace(PTRACE_GETREGSET, target, (uint32_t)NT_X86_XSTATE, &iov))
+ err(1, "PTRACE_GETREGSET");
+
+ if (!memcmp(tiledata, xsave_buffer + xsave_xtiledata_offset, xtiledata_size))
+ return 0;
+ else
+ return -1;
+}
+
+static void test_tile_write(void)
+{
+ int status, rc;
+ pid_t child;
+ bool pass;
+
+ child = fork();
+ if (child < 0) {
+ err(1, "fork");
+ } else if (!child) {
+ if (ptracee_state_perm)
+ enable_tiledata();
+
+ if (ptrace(PTRACE_TRACEME, 0, NULL, NULL))
+ err(1, "PTRACE_TRACEME");
+
+ raise(SIGTRAP);
+ _exit(0);
+ }
+
+ do {
+ wait(&status);
+ } while (WSTOPSIG(status) != SIGTRAP);
+
+ printf("\tInject tile data %s ARCH_SET_STATE_ENABLE\n",
+ ptracee_state_perm ? "with" : "without");
+
+ rc = inject_tiledata(child);
+ pass = (rc == EFAULT && !ptracee_state_perm) ||
+ (!rc && ptracee_state_perm);
+ if (!pass)
+ nerrs++;
+ printf("[%s]\tTile data was %swritten on ptracee.\n",
+ pass ? "OK" : "FAIL", errs ? "not " : "");
+
+ ptrace(PTRACE_DETACH, child, NULL, NULL);
+ wait(&status);
+ if (!WIFEXITED(status) || WEXITSTATUS(status))
+ err(1, "ptrace test");
+}
+
+static void test_ptrace(void)
+{
+ printf("[RUN]\tCheck ptrace() to inject tile data.\n");
+
+ ptracee_state_perm = false;
+ test_tile_write();
+
+ ptracee_state_perm = true;
+ test_tile_write();
+}
+
+/* Signal handling test */
+
+static bool init_tiledata, load_tiledata;
+static volatile bool signaled, sigstk_prefill;
+
+#define SIGFRAME_TILEDATA_SIGNATURE 0xEE
+
+static void handle_sigstk_prefill(int sig, siginfo_t *info, void *ctx_void)
+{
+ void *xbuf = ((ucontext_t *)ctx_void)->uc_mcontext.fpregs;
+ struct _fpx_sw_bytes *sw_bytes = get_fpx_sw_bytes(xsave);
+
+ if (sw_bytes->xstate_size >= (xsave_xtiledata_offset + xtiledata_size)) {
+ memset(xbuf + xsave_xtiledata_offset, SIGFRAME_TILEDATA_SIGNATURE,
+ xtiledata_size);
+ }
+
+ sigstk_prefill = true;
+}
+
+static void handle_signal(int sig, siginfo_t *info, void *ctx_void)
+{
+ bool tiledata_area, tiledata_bit, tiledata_inuse;
+ void *xbuf = ((ucontext_t *)ctx_void)->uc_mcontext.fpregs;
+ struct _fpx_sw_bytes *sw_bytes = get_fpx_sw_bytes(xbuf);
+ char d = SIGFRAME_TILEDATA_SIGNATURE;
+ int i;
+
+ printf("\tAt signal delivery,\n");
+
+ /* Check SW reserved data in the buffer: */
+ if ((sw_bytes->xstate_size >= (xsave_xtiledata_offset + xtiledata_size)) &&
+ (get_fpx_sw_bytes_xstatebv(xbuf) & XFEATURE_MASK_XTILEDATA)) {
+ printf("[OK]\tValid xstate size and mask in the SW data of xstate buffer\n");
+ } else {
+ errs++;
+ printf("[FAIL]\tInvalid xstate size and/or mask in the SW data of xstate buffer\n");
+ }
+
+ /* Check XSAVE buffer header: */
+ tiledata_inuse = (load_tiledata && !init_tiledata);
+ tiledata_bit = get_xstatebv(xbuf) & XFEATURE_MASK_XTILEDATA;
+
+ if (tiledata_bit == tiledata_inuse) {
+ printf("[OK]\tTiledata bit is %sset in XSTATE_BV of xstate buffer.\n",
+ tiledata_bit ? "" : "not ");
+ } else {
+ errs++;
+ printf("[FAIL]\tTiledata bit is %sset in XSTATE_BV of xstate buffer.\n",
+ tiledata_bit ? "" : "not ");
+ }
+
+ /*
+ * Check the sigframe data:
+ */
+
+ tiledata_inuse = (load_tiledata && !init_tiledata);
+ tiledata_area = false;
+ if (sw_bytes->xstate_size >= (xsave_xtiledata_offset + xtiledata_size)) {
+ for (i = 0; i < xtiledata_size; i++) {
+ if (memcmp(xbuf + xsave_xtiledata_offset + i, &d, 1)) {
+ tiledata_area = true;
+ break;
+ }
+ }
+ }
+
+ if (tiledata_area == tiledata_inuse) {
+ printf("[OK]\tTiledata is %ssaved in signal buffer.\n",
+ tiledata_area ? "" : "not ");
+ } else {
+ errs++;
+ printf("[FAIL]\tTiledata is %ssaved in signal buffer.\n",
+ tiledata_area ? "" : "not ");
+ }
+
+ /* Load random tiledata to test sigreturn: */
+ clear_xstate_header(xsave_buffer);
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILEDATA);
+ set_rand_tiledata(xsave_buffer + xsave_xtiledata_offset);
+ xrstor_safe(xsave_buffer, -1, -1);
+ signaled = true;
+}
+
+static void test_signal_handling(void)
+{
+ pid_t child;
+
+ signaled = false;
+ sigstk_prefill = false;
+
+ child = fork();
+ if (child < 0) {
+ err(1, "fork");
+ } else if (child > 0) {
+ do {
+ int status;
+
+ wait(&status);
+ if (WIFSTOPPED(status))
+ kill(child, SIGCONT);
+ else if (WIFEXITED(status) && !WEXITSTATUS(status))
+ break;
+ else
+ err(1, "signal test child");
+ } while (1);
+ return;
+ }
+
+ printf("\tBefore signal, load tile data -- %s", load_tiledata ? "yes, " : "no:\n");
+ if (load_tiledata)
+ printf("re-initialized -- %s:\n", init_tiledata ? "yes" : "no");
+
+ /*
+ * Raise SIGUSR1 to pre-fill sig stack. Also, load tiledata to size the pre-fill.
+ */
+
+ if (load_tiledata) {
+ clear_xstate_header(xsave_buffer);
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILEDATA);
+ xrstor_safe(xsave_buffer, -1, -1);
+ }
+
+ raise(SIGUSR1);
+ if (!sigstk_prefill)
+ err(1, "SIGUSR1");
+
+ /*
+ * Raise SIGALRM to test AMX state handling in signal delivery. Set up the state and
+ * data before the test.
+ */
+
+ if (load_tiledata) {
+ clear_xstate_header(xsave_buffer);
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILEDATA);
+ set_rand_tiledata(xsave_buffer + xsave_xtiledata_offset);
+ xrstor_safe(xsave_buffer, -1, -1);
+
+ if (init_tiledata) {
+ clear_xstate_header(xsave_buffer);
+ set_xstatebv(xsave_buffer, 0);
+ xrstor_safe(xsave_buffer, -1, -1);
+ memset(tiledata, 0, xtiledata_size);
+ } else {
+ memcpy(tiledata, xsave_buffer + xsave_xtiledata_offset,
+ xtiledata_size);
+ }
+ } else {
+ memset(tiledata, 0, xtiledata_size);
+ }
+
+ raise(SIGALRM);
+ if (!signaled)
+ err(1, "SIGALRM");
+
+ printf("\tReturn from signal handler,\n");
+ xsave(xsave_buffer, XFEATURE_MASK_XTILEDATA, 0);
+ if (memcmp(tiledata, xsave_buffer + xsave_xtiledata_offset, xtiledata_size)) {
+ errs++;
+ printf("[FAIL]\tTiledata is not restored.\n");
+ } else {
+ printf("[OK]\tTiledata is restored.\n");
+ }
+
+ if (errs)
+ nerrs++;
+ _exit(0);
+}
+
+static void test_signal(void)
+{
+ printf("[RUN]\tCheck tile data state in signal path:\n");
+
+ sethandler(SIGALRM, handle_signal, 0);
+ sethandler(SIGUSR1, handle_sigstk_prefill, 0);
+
+ load_tiledata = false;
+ init_tiledata = false;
+ errs = 0;
+ test_signal_handling();
+
+ load_tiledata = true;
+ init_tiledata = false;
+ errs = 0;
+ test_signal_handling();
+
+ load_tiledata = true;
+ init_tiledata = true;
+ errs = 0;
+ test_signal_handling();
+
+ clearhandler(SIGALRM);
+ clearhandler(SIGUSR1);
+}
+
+int main(int argc, char **argv)
+{
+ cpu_set_t cpuset;
+
+ if (argc == 2) {
+ int ret;
+
+ if (strcmp(argv[1], TEST_EXECV_ARG))
+ return 0;
+
+ printf("\tRun after execv().\n");
+
+ xsave_buffer = alloc_xsave_buffer();
+ clear_xstate_header(xsave_buffer);
+
+ set_xstatebv(xsave_buffer, XFEATURE_MASK_XTILE);
+ set_rand_tiledata(xsave_buffer + xsave_xtiledata_offset);
+
+ sethandler(SIGILL, handle_noperm, 0);
+
+ if (xrstor_safe(xsave_buffer, -1, -1)) {
+ printf("[FAIL]\tSucceeded after execv().\n");
+ ret = 1;
+ } else {
+ printf("[OK]\tBlocked after execv().\n");
+ ret = 0;
+ }
+
+ clearhandler(SIGILL);
+ free(xsave_buffer);
+ _exit(ret);
+ }
+
+ /* Check hardware availability at first */
+
+ if (!check_xtile()) {
+ printf("%s is disabled.\n", noxsave ? "XSAVE" : "AMX");
+ return 0;
+ }
+
+ check_cpuid();
+
+ xsave_buffer = alloc_xsave_buffer();
+ clear_xstate_header(xsave_buffer);
+
+ tiledata = malloc(xtiledata_size);
+ if (!tiledata)
+ err(1, "malloc()");
+
+ tilecfg = malloc(xtilecfg_size);
+ if (!tilecfg)
+ err(1, "malloc()");
+ set_tilecfg(tilecfg);
+
+ nerrs = 0;
+
+ sethandler(SIGILL, handle_noperm, 0);
+
+ CPU_ZERO(&cpuset);
+ CPU_SET(0, &cpuset);
+
+ if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
+ err(1, "sched_setaffinity to CPU 0");
+
+ test_arch_prctl(argc, argv);
+ test_ptrace();
+
+ enable_tiledata();
+ test_context_switch();
+ test_fork();
+ test_signal();
+
+ clearhandler(SIGILL);
+
+ free(tilecfg);
+ free(tiledata);
+ free(xsave_buffer);
+ return nerrs ? 1 : 0;
+}