1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2016, Cyril Bur, IBM Corp. 4 * 5 * Test the kernel's signal frame code. 6 * 7 * The kernel sets up two sets of ucontexts if the signal was to be 8 * delivered while the thread was in a transaction. 9 * Expected behaviour is that the checkpointed state is in the user 10 * context passed to the signal handler. The speculated state can be 11 * accessed with the uc_link pointer. 12 * 13 * The rationale for this is that if TM unaware code (which linked 14 * against TM libs) installs a signal handler it will not know of the 15 * speculative nature of the 'live' registers and may infer the wrong 16 * thing. 17 */ 18 19 #include <stdlib.h> 20 #include <stdio.h> 21 #include <signal.h> 22 #include <unistd.h> 23 24 #include <altivec.h> 25 26 #include "utils.h" 27 #include "tm.h" 28 29 #define MAX_ATTEMPT 500000 30 31 #define NV_FPU_REGS 18 32 33 long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss); 34 35 /* Be sure there are 2x as many as there are NV FPU regs (2x18) */ 36 static double fps[] = { 37 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 38 -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18 39 }; 40 41 static sig_atomic_t fail; 42 43 static void signal_usr1(int signum, siginfo_t *info, void *uc) 44 { 45 int i; 46 ucontext_t *ucp = uc; 47 ucontext_t *tm_ucp = ucp->uc_link; 48 49 for (i = 0; i < NV_FPU_REGS && !fail; i++) { 50 fail = (ucp->uc_mcontext.fp_regs[i + 14] != fps[i]); 51 fail |= (tm_ucp->uc_mcontext.fp_regs[i + 14] != fps[i + NV_FPU_REGS]); 52 if (fail) 53 printf("Failed on %d FP %g or %g\n", i, ucp->uc_mcontext.fp_regs[i + 14], tm_ucp->uc_mcontext.fp_regs[i + 14]); 54 } 55 } 56 57 static int tm_signal_context_chk_fpu() 58 { 59 struct sigaction act; 60 int i; 61 long rc; 62 pid_t pid = getpid(); 63 64 SKIP_IF(!have_htm()); 65 66 act.sa_sigaction = signal_usr1; 67 sigemptyset(&act.sa_mask); 68 act.sa_flags = SA_SIGINFO; 69 if (sigaction(SIGUSR1, &act, NULL) < 0) { 70 perror("sigaction sigusr1"); 71 exit(1); 72 } 73 74 i = 0; 75 while (i < MAX_ATTEMPT && !fail) { 76 rc = tm_signal_self_context_load(pid, NULL, fps, NULL, NULL); 77 FAIL_IF(rc != pid); 78 i++; 79 } 80 81 return fail; 82 } 83 84 int main(void) 85 { 86 return test_harness(tm_signal_context_chk_fpu, "tm_signal_context_chk_fpu"); 87 } 88