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selftests/x86/amx: Add test cases for AMX state management
AMX TILEDATA is a very large XSAVE feature. It could have caused nasty XSAVE buffer space waste in two places: * Signal stacks * Kernel task_struct->fpu buffers To avoid this waste, neither of these buffers have AMX state by default. The non-default features are called "dynamic" features. There is an arch_prctl(ARCH_REQ_XCOMP_PERM) which allows a task to declare that it wants to use AMX or other "dynamic" XSAVE features. This arch_prctl() ensures that sufficient sigaltstack space is available before it will succeed. It also expands the task_struct buffer. Functions of this test: * Test arch_prctl(ARCH_REQ_XCOMP_PERM). Ensure that it checks for proper sigaltstack sizing and that the sizing is enforced for future sigaltstack calls. * Ensure that ARCH_REQ_XCOMP_PERM is inherited across fork() * Ensure that TILEDATA use before the prctl() is fatal * Ensure that TILEDATA is cleared across fork() Note: Generally, compiler support is needed to do something with AMX. Instead, directly load AMX state from userspace with a plain XSAVE. Do not depend on the compiler. [ dhansen: bunches of cleanups ] Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20211026122524.7BEDAA95@davehans-spike.ostc.intel.com
This commit is contained in:
Chang S. Bae
Borislav Petkov
parent
2308ee57d9
commit
6a3e0651b4
@ -18,7 +18,7 @@ TARGETS_C_32BIT_ONLY := entry_from_vm86 test_syscall_vdso unwind_vdso \
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test_FCMOV test_FCOMI test_FISTTP \
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vdso_restorer
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TARGETS_C_64BIT_ONLY := fsgsbase sysret_rip syscall_numbering \
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corrupt_xstate_header
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corrupt_xstate_header amx
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# Some selftests require 32bit support enabled also on 64bit systems
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TARGETS_C_32BIT_NEEDED := ldt_gdt ptrace_syscall
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697
tools/testing/selftests/x86/amx.c
Normal file
697
tools/testing/selftests/x86/amx.c
Normal file
@ -0,0 +1,697 @@
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <err.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <x86intrin.h>
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#include <linux/futex.h>
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#include <sys/auxv.h>
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#include <sys/mman.h>
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#include <sys/shm.h>
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#include <sys/syscall.h>
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#include <sys/wait.h>
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#ifndef __x86_64__
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# error This test is 64-bit only
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#endif
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#define XSAVE_HDR_OFFSET 512
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#define XSAVE_HDR_SIZE 64
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struct xsave_buffer {
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union {
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struct {
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char legacy[XSAVE_HDR_OFFSET];
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char header[XSAVE_HDR_SIZE];
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char extended[0];
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};
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char bytes[0];
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};
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};
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static inline uint64_t xgetbv(uint32_t index)
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{
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uint32_t eax, edx;
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asm volatile("xgetbv;"
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: "=a" (eax), "=d" (edx)
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: "c" (index));
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return eax + ((uint64_t)edx << 32);
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}
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static inline void cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
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{
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asm volatile("cpuid;"
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: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
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: "0" (*eax), "2" (*ecx));
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}
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static inline void xsave(struct xsave_buffer *xbuf, uint64_t rfbm)
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{
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uint32_t rfbm_lo = rfbm;
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uint32_t rfbm_hi = rfbm >> 32;
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asm volatile("xsave (%%rdi)"
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: : "D" (xbuf), "a" (rfbm_lo), "d" (rfbm_hi)
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: "memory");
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}
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static inline void xrstor(struct xsave_buffer *xbuf, uint64_t rfbm)
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{
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uint32_t rfbm_lo = rfbm;
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uint32_t rfbm_hi = rfbm >> 32;
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asm volatile("xrstor (%%rdi)"
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: : "D" (xbuf), "a" (rfbm_lo), "d" (rfbm_hi));
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}
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/* err() exits and will not return */
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#define fatal_error(msg, ...) err(1, "[FAIL]\t" msg, ##__VA_ARGS__)
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static void sethandler(int sig, void (*handler)(int, siginfo_t *, void *),
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int flags)
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{
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_sigaction = handler;
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sa.sa_flags = SA_SIGINFO | flags;
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sigemptyset(&sa.sa_mask);
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if (sigaction(sig, &sa, 0))
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fatal_error("sigaction");
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}
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static void clearhandler(int sig)
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{
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = SIG_DFL;
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sigemptyset(&sa.sa_mask);
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if (sigaction(sig, &sa, 0))
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fatal_error("sigaction");
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}
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#define XFEATURE_XTILECFG 17
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#define XFEATURE_XTILEDATA 18
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#define XFEATURE_MASK_XTILECFG (1 << XFEATURE_XTILECFG)
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#define XFEATURE_MASK_XTILEDATA (1 << XFEATURE_XTILEDATA)
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#define XFEATURE_MASK_XTILE (XFEATURE_MASK_XTILECFG | XFEATURE_MASK_XTILEDATA)
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#define CPUID_LEAF1_ECX_XSAVE_MASK (1 << 26)
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#define CPUID_LEAF1_ECX_OSXSAVE_MASK (1 << 27)
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static inline void check_cpuid_xsave(void)
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{
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uint32_t eax, ebx, ecx, edx;
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/*
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* CPUID.1:ECX.XSAVE[bit 26] enumerates general
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* support for the XSAVE feature set, including
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* XGETBV.
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*/
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eax = 1;
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ecx = 0;
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cpuid(&eax, &ebx, &ecx, &edx);
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if (!(ecx & CPUID_LEAF1_ECX_XSAVE_MASK))
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fatal_error("cpuid: no CPU xsave support");
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if (!(ecx & CPUID_LEAF1_ECX_OSXSAVE_MASK))
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fatal_error("cpuid: no OS xsave support");
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}
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static uint32_t xbuf_size;
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static struct {
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uint32_t xbuf_offset;
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uint32_t size;
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} xtiledata;
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#define CPUID_LEAF_XSTATE 0xd
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#define CPUID_SUBLEAF_XSTATE_USER 0x0
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#define TILE_CPUID 0x1d
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#define TILE_PALETTE_ID 0x1
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static void check_cpuid_xtiledata(void)
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{
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uint32_t eax, ebx, ecx, edx;
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eax = CPUID_LEAF_XSTATE;
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ecx = CPUID_SUBLEAF_XSTATE_USER;
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cpuid(&eax, &ebx, &ecx, &edx);
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/*
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* EBX enumerates the size (in bytes) required by the XSAVE
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* instruction for an XSAVE area containing all the user state
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* components corresponding to bits currently set in XCR0.
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*
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* Stash that off so it can be used to allocate buffers later.
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*/
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xbuf_size = ebx;
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eax = CPUID_LEAF_XSTATE;
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ecx = XFEATURE_XTILEDATA;
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cpuid(&eax, &ebx, &ecx, &edx);
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/*
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* eax: XTILEDATA state component size
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* ebx: XTILEDATA state component offset in user buffer
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*/
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if (!eax || !ebx)
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fatal_error("xstate cpuid: invalid tile data size/offset: %d/%d",
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eax, ebx);
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xtiledata.size = eax;
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xtiledata.xbuf_offset = ebx;
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}
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/* The helpers for managing XSAVE buffer and tile states: */
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struct xsave_buffer *alloc_xbuf(void)
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{
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struct xsave_buffer *xbuf;
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/* XSAVE buffer should be 64B-aligned. */
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xbuf = aligned_alloc(64, xbuf_size);
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if (!xbuf)
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fatal_error("aligned_alloc()");
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return xbuf;
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}
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static inline void clear_xstate_header(struct xsave_buffer *buffer)
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{
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memset(&buffer->header, 0, sizeof(buffer->header));
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}
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static inline uint64_t get_xstatebv(struct xsave_buffer *buffer)
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{
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/* XSTATE_BV is at the beginning of the header: */
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return *(uint64_t *)&buffer->header;
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}
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static inline void set_xstatebv(struct xsave_buffer *buffer, uint64_t bv)
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{
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/* XSTATE_BV is at the beginning of the header: */
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*(uint64_t *)(&buffer->header) = bv;
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}
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static void set_rand_tiledata(struct xsave_buffer *xbuf)
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{
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int *ptr = (int *)&xbuf->bytes[xtiledata.xbuf_offset];
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int data;
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int i;
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/*
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* Ensure that 'data' is never 0. This ensures that
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* the registers are never in their initial configuration
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* and thus never tracked as being in the init state.
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*/
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data = rand() | 1;
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for (i = 0; i < xtiledata.size / sizeof(int); i++, ptr++)
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*ptr = data;
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}
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struct xsave_buffer *stashed_xsave;
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static void init_stashed_xsave(void)
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{
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stashed_xsave = alloc_xbuf();
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if (!stashed_xsave)
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fatal_error("failed to allocate stashed_xsave\n");
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clear_xstate_header(stashed_xsave);
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}
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static void free_stashed_xsave(void)
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{
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free(stashed_xsave);
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}
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/* See 'struct _fpx_sw_bytes' at sigcontext.h */
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#define SW_BYTES_OFFSET 464
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/* N.B. The struct's field name varies so read from the offset. */
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#define SW_BYTES_BV_OFFSET (SW_BYTES_OFFSET + 8)
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static inline struct _fpx_sw_bytes *get_fpx_sw_bytes(void *buffer)
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{
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return (struct _fpx_sw_bytes *)(buffer + SW_BYTES_OFFSET);
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}
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static inline uint64_t get_fpx_sw_bytes_features(void *buffer)
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{
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return *(uint64_t *)(buffer + SW_BYTES_BV_OFFSET);
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}
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/* Work around printf() being unsafe in signals: */
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#define SIGNAL_BUF_LEN 1000
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char signal_message_buffer[SIGNAL_BUF_LEN];
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void sig_print(char *msg)
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{
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int left = SIGNAL_BUF_LEN - strlen(signal_message_buffer) - 1;
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strncat(signal_message_buffer, msg, left);
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}
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static volatile bool noperm_signaled;
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static int noperm_errs;
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/*
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* Signal handler for when AMX is used but
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* permission has not been obtained.
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*/
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static void handle_noperm(int sig, siginfo_t *si, void *ctx_void)
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{
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ucontext_t *ctx = (ucontext_t *)ctx_void;
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void *xbuf = ctx->uc_mcontext.fpregs;
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struct _fpx_sw_bytes *sw_bytes;
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uint64_t features;
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/* Reset the signal message buffer: */
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signal_message_buffer[0] = '\0';
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sig_print("\tAt SIGILL handler,\n");
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if (si->si_code != ILL_ILLOPC) {
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noperm_errs++;
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sig_print("[FAIL]\tInvalid signal code.\n");
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} else {
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sig_print("[OK]\tValid signal code (ILL_ILLOPC).\n");
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}
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sw_bytes = get_fpx_sw_bytes(xbuf);
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/*
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* Without permission, the signal XSAVE buffer should not
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* have room for AMX register state (aka. xtiledata).
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* Check that the size does not overlap with where xtiledata
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* will reside.
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*
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* This also implies that no state components *PAST*
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* XTILEDATA (features >=19) can be present in the buffer.
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*/
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if (sw_bytes->xstate_size <= xtiledata.xbuf_offset) {
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sig_print("[OK]\tValid xstate size\n");
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} else {
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noperm_errs++;
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sig_print("[FAIL]\tInvalid xstate size\n");
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}
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features = get_fpx_sw_bytes_features(xbuf);
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/*
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* Without permission, the XTILEDATA feature
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* bit should not be set.
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*/
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if ((features & XFEATURE_MASK_XTILEDATA) == 0) {
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sig_print("[OK]\tValid xstate mask\n");
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} else {
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noperm_errs++;
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sig_print("[FAIL]\tInvalid xstate mask\n");
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}
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noperm_signaled = true;
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ctx->uc_mcontext.gregs[REG_RIP] += 3; /* Skip the faulting XRSTOR */
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}
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/* Return true if XRSTOR is successful; otherwise, false. */
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static inline bool xrstor_safe(struct xsave_buffer *xbuf, uint64_t mask)
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{
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noperm_signaled = false;
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xrstor(xbuf, mask);
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/* Print any messages produced by the signal code: */
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printf("%s", signal_message_buffer);
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/*
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* Reset the buffer to make sure any future printing
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* only outputs new messages:
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*/
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signal_message_buffer[0] = '\0';
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if (noperm_errs)
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fatal_error("saw %d errors in noperm signal handler\n", noperm_errs);
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return !noperm_signaled;
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}
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/*
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* Use XRSTOR to populate the XTILEDATA registers with
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* random data.
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*
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* Return true if successful; otherwise, false.
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*/
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static inline bool load_rand_tiledata(struct xsave_buffer *xbuf)
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{
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clear_xstate_header(xbuf);
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set_xstatebv(xbuf, XFEATURE_MASK_XTILEDATA);
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set_rand_tiledata(xbuf);
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return xrstor_safe(xbuf, XFEATURE_MASK_XTILEDATA);
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}
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/* Return XTILEDATA to its initial configuration. */
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static inline void init_xtiledata(void)
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{
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clear_xstate_header(stashed_xsave);
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xrstor_safe(stashed_xsave, XFEATURE_MASK_XTILEDATA);
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}
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enum expected_result { FAIL_EXPECTED, SUCCESS_EXPECTED };
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/* arch_prctl() and sigaltstack() test */
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#define ARCH_GET_XCOMP_PERM 0x1022
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#define ARCH_REQ_XCOMP_PERM 0x1023
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static void req_xtiledata_perm(void)
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{
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syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_PERM, XFEATURE_XTILEDATA);
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}
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static void validate_req_xcomp_perm(enum expected_result exp)
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{
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unsigned long bitmask;
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long rc;
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rc = syscall(SYS_arch_prctl, ARCH_REQ_XCOMP_PERM, XFEATURE_XTILEDATA);
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if (exp == FAIL_EXPECTED) {
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if (rc) {
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printf("[OK]\tARCH_REQ_XCOMP_PERM saw expected failure..\n");
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return;
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}
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fatal_error("ARCH_REQ_XCOMP_PERM saw unexpected success.\n");
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} else if (rc) {
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fatal_error("ARCH_REQ_XCOMP_PERM saw unexpected failure.\n");
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}
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rc = syscall(SYS_arch_prctl, ARCH_GET_XCOMP_PERM, &bitmask);
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if (rc) {
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fatal_error("prctl(ARCH_GET_XCOMP_PERM) error: %ld", rc);
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} else if (bitmask & XFEATURE_MASK_XTILE) {
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printf("\tARCH_REQ_XCOMP_PERM is successful.\n");
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}
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}
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static void validate_xcomp_perm(enum expected_result exp)
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{
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bool load_success = load_rand_tiledata(stashed_xsave);
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if (exp == FAIL_EXPECTED) {
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if (load_success) {
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noperm_errs++;
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printf("[FAIL]\tLoad tiledata succeeded.\n");
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} else {
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printf("[OK]\tLoad tiledata failed.\n");
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}
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} else if (exp == SUCCESS_EXPECTED) {
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if (load_success) {
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printf("[OK]\tLoad tiledata succeeded.\n");
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} else {
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noperm_errs++;
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printf("[FAIL]\tLoad tiledata failed.\n");
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}
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}
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}
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#ifndef AT_MINSIGSTKSZ
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# define AT_MINSIGSTKSZ 51
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#endif
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static void *alloc_altstack(unsigned int size)
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{
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void *altstack;
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altstack = mmap(NULL, size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS | MAP_STACK, -1, 0);
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if (altstack == MAP_FAILED)
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fatal_error("mmap() for altstack");
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return altstack;
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}
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static void setup_altstack(void *addr, unsigned long size, enum expected_result exp)
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{
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stack_t ss;
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int rc;
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memset(&ss, 0, sizeof(ss));
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ss.ss_size = size;
|
||||
ss.ss_sp = addr;
|
||||
|
||||
rc = sigaltstack(&ss, NULL);
|
||||
|
||||
if (exp == FAIL_EXPECTED) {
|
||||
if (rc) {
|
||||
printf("[OK]\tsigaltstack() failed.\n");
|
||||
} else {
|
||||
fatal_error("sigaltstack() succeeded unexpectedly.\n");
|
||||
}
|
||||
} else if (rc) {
|
||||
fatal_error("sigaltstack()");
|
||||
}
|
||||
}
|
||||
|
||||
static void test_dynamic_sigaltstack(void)
|
||||
{
|
||||
unsigned int small_size, enough_size;
|
||||
unsigned long minsigstksz;
|
||||
void *altstack;
|
||||
|
||||
minsigstksz = getauxval(AT_MINSIGSTKSZ);
|
||||
printf("\tAT_MINSIGSTKSZ = %lu\n", minsigstksz);
|
||||
/*
|
||||
* getauxval() itself can return 0 for failure or
|
||||
* success. But, in this case, AT_MINSIGSTKSZ
|
||||
* will always return a >=0 value if implemented.
|
||||
* Just check for 0.
|
||||
*/
|
||||
if (minsigstksz == 0) {
|
||||
printf("no support for AT_MINSIGSTKSZ, skipping sigaltstack tests\n");
|
||||
return;
|
||||
}
|
||||
|
||||
enough_size = minsigstksz * 2;
|
||||
|
||||
altstack = alloc_altstack(enough_size);
|
||||
printf("\tAllocate memory for altstack (%u bytes).\n", enough_size);
|
||||
|
||||
/*
|
||||
* Try setup_altstack() with a size which can not fit
|
||||
* XTILEDATA. ARCH_REQ_XCOMP_PERM should fail.
|
||||
*/
|
||||
small_size = minsigstksz - xtiledata.size;
|
||||
printf("\tAfter sigaltstack() with small size (%u bytes).\n", small_size);
|
||||
setup_altstack(altstack, small_size, SUCCESS_EXPECTED);
|
||||
validate_req_xcomp_perm(FAIL_EXPECTED);
|
||||
|
||||
/*
|
||||
* Try setup_altstack() with a size derived from
|
||||
* AT_MINSIGSTKSZ. It should be more than large enough
|
||||
* and thus ARCH_REQ_XCOMP_PERM should succeed.
|
||||
*/
|
||||
printf("\tAfter sigaltstack() with enough size (%u bytes).\n", enough_size);
|
||||
setup_altstack(altstack, enough_size, SUCCESS_EXPECTED);
|
||||
validate_req_xcomp_perm(SUCCESS_EXPECTED);
|
||||
|
||||
/*
|
||||
* Try to coerce setup_altstack() to again accept a
|
||||
* too-small altstack. This ensures that big-enough
|
||||
* sigaltstacks can not shrink to a too-small value
|
||||
* once XTILEDATA permission is established.
|
||||
*/
|
||||
printf("\tThen, sigaltstack() with small size (%u bytes).\n", small_size);
|
||||
setup_altstack(altstack, small_size, FAIL_EXPECTED);
|
||||
}
|
||||
|
||||
static void test_dynamic_state(void)
|
||||
{
|
||||
pid_t parent, child, grandchild;
|
||||
|
||||
parent = fork();
|
||||
if (parent < 0) {
|
||||
/* fork() failed */
|
||||
fatal_error("fork");
|
||||
} else if (parent > 0) {
|
||||
int status;
|
||||
/* fork() succeeded. Now in the parent. */
|
||||
|
||||
wait(&status);
|
||||
if (!WIFEXITED(status) || WEXITSTATUS(status))
|
||||
fatal_error("arch_prctl test parent exit");
|
||||
return;
|
||||
}
|
||||
/* fork() succeeded. Now in the child . */
|
||||
|
||||
printf("[RUN]\tCheck ARCH_REQ_XCOMP_PERM around process fork() and sigaltack() test.\n");
|
||||
|
||||
printf("\tFork a child.\n");
|
||||
child = fork();
|
||||
if (child < 0) {
|
||||
fatal_error("fork");
|
||||
} else if (child > 0) {
|
||||
int status;
|
||||
|
||||
wait(&status);
|
||||
if (!WIFEXITED(status) || WEXITSTATUS(status))
|
||||
fatal_error("arch_prctl test child exit");
|
||||
_exit(0);
|
||||
}
|
||||
|
||||
/*
|
||||
* The permission request should fail without an
|
||||
* XTILEDATA-compatible signal stack
|
||||
*/
|
||||
printf("\tTest XCOMP_PERM at child.\n");
|
||||
validate_xcomp_perm(FAIL_EXPECTED);
|
||||
|
||||
/*
|
||||
* Set up an XTILEDATA-compatible signal stack and
|
||||
* also obtain permission to populate XTILEDATA.
|
||||
*/
|
||||
printf("\tTest dynamic sigaltstack at child:\n");
|
||||
test_dynamic_sigaltstack();
|
||||
|
||||
/* Ensure that XTILEDATA can be populated. */
|
||||
printf("\tTest XCOMP_PERM again at child.\n");
|
||||
validate_xcomp_perm(SUCCESS_EXPECTED);
|
||||
|
||||
printf("\tFork a grandchild.\n");
|
||||
grandchild = fork();
|
||||
if (grandchild < 0) {
|
||||
/* fork() failed */
|
||||
fatal_error("fork");
|
||||
} else if (!grandchild) {
|
||||
/* fork() succeeded. Now in the (grand)child. */
|
||||
printf("\tTest XCOMP_PERM at grandchild.\n");
|
||||
|
||||
/*
|
||||
* Ensure that the grandchild inherited
|
||||
* permission and a compatible sigaltstack:
|
||||
*/
|
||||
validate_xcomp_perm(SUCCESS_EXPECTED);
|
||||
} else {
|
||||
int status;
|
||||
/* fork() succeeded. Now in the parent. */
|
||||
|
||||
wait(&status);
|
||||
if (!WIFEXITED(status) || WEXITSTATUS(status))
|
||||
fatal_error("fork test grandchild");
|
||||
}
|
||||
|
||||
_exit(0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Save current register state and compare it to @xbuf1.'
|
||||
*
|
||||
* Returns false if @xbuf1 matches the registers.
|
||||
* Returns true if @xbuf1 differs from the registers.
|
||||
*/
|
||||
static inline bool __validate_tiledata_regs(struct xsave_buffer *xbuf1)
|
||||
{
|
||||
struct xsave_buffer *xbuf2;
|
||||
int ret;
|
||||
|
||||
xbuf2 = alloc_xbuf();
|
||||
if (!xbuf2)
|
||||
fatal_error("failed to allocate XSAVE buffer\n");
|
||||
|
||||
xsave(xbuf2, XFEATURE_MASK_XTILEDATA);
|
||||
ret = memcmp(&xbuf1->bytes[xtiledata.xbuf_offset],
|
||||
&xbuf2->bytes[xtiledata.xbuf_offset],
|
||||
xtiledata.size);
|
||||
|
||||
free(xbuf2);
|
||||
|
||||
if (ret == 0)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
static inline void validate_tiledata_regs_same(struct xsave_buffer *xbuf)
|
||||
{
|
||||
int ret = __validate_tiledata_regs(xbuf);
|
||||
|
||||
if (ret != 0)
|
||||
fatal_error("TILEDATA registers changed");
|
||||
}
|
||||
|
||||
static inline void validate_tiledata_regs_changed(struct xsave_buffer *xbuf)
|
||||
{
|
||||
int ret = __validate_tiledata_regs(xbuf);
|
||||
|
||||
if (ret == 0)
|
||||
fatal_error("TILEDATA registers did not change");
|
||||
}
|
||||
|
||||
/* tiledata inheritance test */
|
||||
|
||||
static void test_fork(void)
|
||||
{
|
||||
pid_t child, grandchild;
|
||||
|
||||
child = fork();
|
||||
if (child < 0) {
|
||||
/* fork() failed */
|
||||
fatal_error("fork");
|
||||
} else if (child > 0) {
|
||||
/* fork() succeeded. Now in the parent. */
|
||||
int status;
|
||||
|
||||
wait(&status);
|
||||
if (!WIFEXITED(status) || WEXITSTATUS(status))
|
||||
fatal_error("fork test child");
|
||||
return;
|
||||
}
|
||||
/* fork() succeeded. Now in the child. */
|
||||
printf("[RUN]\tCheck tile data inheritance.\n\tBefore fork(), load tiledata\n");
|
||||
|
||||
load_rand_tiledata(stashed_xsave);
|
||||
|
||||
grandchild = fork();
|
||||
if (grandchild < 0) {
|
||||
/* fork() failed */
|
||||
fatal_error("fork");
|
||||
} else if (grandchild > 0) {
|
||||
/* fork() succeeded. Still in the first child. */
|
||||
int status;
|
||||
|
||||
wait(&status);
|
||||
if (!WIFEXITED(status) || WEXITSTATUS(status))
|
||||
fatal_error("fork test grand child");
|
||||
_exit(0);
|
||||
}
|
||||
/* fork() succeeded. Now in the (grand)child. */
|
||||
|
||||
/*
|
||||
* TILEDATA registers are not preserved across fork().
|
||||
* Ensure that their value has changed:
|
||||
*/
|
||||
validate_tiledata_regs_changed(stashed_xsave);
|
||||
|
||||
_exit(0);
|
||||
}
|
||||
|
||||
int main(void)
|
||||
{
|
||||
/* Check hardware availability at first */
|
||||
check_cpuid_xsave();
|
||||
check_cpuid_xtiledata();
|
||||
|
||||
init_stashed_xsave();
|
||||
sethandler(SIGILL, handle_noperm, 0);
|
||||
|
||||
test_dynamic_state();
|
||||
|
||||
/* Request permission for the following tests */
|
||||
req_xtiledata_perm();
|
||||
|
||||
test_fork();
|
||||
|
||||
clearhandler(SIGILL);
|
||||
free_stashed_xsave();
|
||||
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user