diff options
| -rw-r--r-- | tools/testing/selftests/x86/amx.c | 2 | ||||
| -rw-r--r-- | tools/testing/selftests/x86/xstate.c | 108 | ||||
| -rw-r--r-- | tools/testing/selftests/x86/xstate.h | 1 |
3 files changed, 111 insertions, 0 deletions
diff --git a/tools/testing/selftests/x86/amx.c b/tools/testing/selftests/x86/amx.c index 4bafbb72aa1b..9cb691d67ef4 100644 --- a/tools/testing/selftests/x86/amx.c +++ b/tools/testing/selftests/x86/amx.c @@ -510,6 +510,8 @@ int main(void) test_ptrace(XFEATURE_XTILEDATA); + test_signal(XFEATURE_XTILEDATA); + clearhandler(SIGILL); free_stashed_xsave(); diff --git a/tools/testing/selftests/x86/xstate.c b/tools/testing/selftests/x86/xstate.c index d318b35ba547..b5600f492632 100644 --- a/tools/testing/selftests/x86/xstate.c +++ b/tools/testing/selftests/x86/xstate.c @@ -21,6 +21,11 @@ static inline uint64_t xgetbv(uint32_t index) return eax + ((uint64_t)edx << 32); } +static inline uint64_t get_xstatebv(struct xsave_buffer *xbuf) +{ + return *(uint64_t *)(&xbuf->header); +} + static struct xstate_info xstate; struct futex_info { @@ -325,3 +330,106 @@ void test_ptrace(uint32_t feature_num) if (!WIFEXITED(status) || WEXITSTATUS(status)) ksft_exit_fail_msg("ptracee exit error\n"); } + +/* + * Test signal delivery for the ABI compatibility. + * See the ABI format: arch/x86/include/uapi/asm/sigcontext.h + */ + +/* + * Avoid using printf() in signal handlers as it is not + * async-signal-safe. + */ +#define SIGNAL_BUF_LEN 1000 +static char signal_message_buffer[SIGNAL_BUF_LEN]; +static void sig_print(char *msg) +{ + int left = SIGNAL_BUF_LEN - strlen(signal_message_buffer) - 1; + + strncat(signal_message_buffer, msg, left); +} + +static struct xsave_buffer *stashed_xbuf; + +static void validate_sigfpstate(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; + uint32_t magic2; + + /* Reset the signal message buffer: */ + signal_message_buffer[0] = '\0'; + + sw_bytes = get_fpx_sw_bytes(xbuf); + if (sw_bytes->magic1 == FP_XSTATE_MAGIC1) + sig_print("[OK]\t'magic1' is valid\n"); + else + sig_print("[FAIL]\t'magic1' is not valid\n"); + + if (get_fpx_sw_bytes_features(xbuf) & xstate.mask) + sig_print("[OK]\t'xfeatures' in SW reserved area is valid\n"); + else + sig_print("[FAIL]\t'xfeatures' in SW reserved area is not valid\n"); + + if (get_xstatebv(xbuf) & xstate.mask) + sig_print("[OK]\t'xfeatures' in XSAVE header is valid\n"); + else + sig_print("[FAIL]\t'xfeatures' in XSAVE hader is not valid\n"); + + if (validate_xstate_same(stashed_xbuf, xbuf)) + sig_print("[OK]\txstate delivery was successful\n"); + else + sig_print("[FAIL]\txstate delivery was not successful\n"); + + magic2 = *(uint32_t *)(xbuf + sw_bytes->xstate_size); + if (magic2 == FP_XSTATE_MAGIC2) + sig_print("[OK]\t'magic2' is valid\n"); + else + sig_print("[FAIL]\t'magic2' is not valid\n"); + + set_rand_data(&xstate, xbuf); + copy_xstate(stashed_xbuf, xbuf); +} + +void test_signal(uint32_t feature_num) +{ + bool valid_xstate; + + xstate = get_xstate_info(feature_num); + + /* + * The signal handler will access this to verify xstate context + * preservation. + */ + + stashed_xbuf = alloc_xbuf(); + if (!stashed_xbuf) + ksft_exit_fail_msg("unable to allocate XSAVE buffer\n"); + + printf("[RUN]\t%s: load xstate and raise SIGUSR1\n", xstate.name); + + sethandler(SIGUSR1, validate_sigfpstate, 0); + + load_rand_xstate(&xstate, stashed_xbuf); + + raise(SIGUSR1); + + /* + * Immediately record the test result, deferring printf() to + * prevent unintended state contamination by that. + */ + valid_xstate = validate_xregs_same(stashed_xbuf); + printf("%s", signal_message_buffer); + + printf("[RUN]\t%s: load new xstate from sighandler and check it after sigreturn\n", + xstate.name); + + if (valid_xstate) + printf("[OK]\txstate was restored correctly\n"); + else + printf("[FAIL]\txstate restoration failed\n"); + + clearhandler(SIGUSR1); + free(stashed_xbuf); +} diff --git a/tools/testing/selftests/x86/xstate.h b/tools/testing/selftests/x86/xstate.h index 2bf11d3a3ce9..4d0ffe9609f8 100644 --- a/tools/testing/selftests/x86/xstate.h +++ b/tools/testing/selftests/x86/xstate.h @@ -191,5 +191,6 @@ static inline void set_rand_data(struct xstate_info *xstate, struct xsave_buffer void test_context_switch(uint32_t feature_num, uint32_t num_threads, uint32_t iterations); void test_ptrace(uint32_t feature_num); +void test_signal(uint32_t feature_num); #endif /* __SELFTESTS_X86_XSTATE_H */ |