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_GPR_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 static sig_atomic_t fail; 36 37 static long gps[] = { 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 static void signal_usr1(int signum, siginfo_t *info, void *uc) 41 { 42 int i; 43 ucontext_t *ucp = uc; 44 ucontext_t *tm_ucp = ucp->uc_link; 45 46 for (i = 0; i < NV_GPR_REGS && !fail; i++) { 47 fail = (ucp->uc_mcontext.gp_regs[i + 14] != gps[i]); 48 fail |= (tm_ucp->uc_mcontext.gp_regs[i + 14] != gps[i + NV_GPR_REGS]); 49 if (fail) 50 printf("Failed on %d GPR %lu or %lu\n", i, 51 ucp->uc_mcontext.gp_regs[i + 14], tm_ucp->uc_mcontext.gp_regs[i + 14]); 52 } 53 } 54 55 static int tm_signal_context_chk_gpr() 56 { 57 struct sigaction act; 58 int i; 59 long rc; 60 pid_t pid = getpid(); 61 62 SKIP_IF(!have_htm()); 63 64 act.sa_sigaction = signal_usr1; 65 sigemptyset(&act.sa_mask); 66 act.sa_flags = SA_SIGINFO; 67 if (sigaction(SIGUSR1, &act, NULL) < 0) { 68 perror("sigaction sigusr1"); 69 exit(1); 70 } 71 72 i = 0; 73 while (i < MAX_ATTEMPT && !fail) { 74 rc = tm_signal_self_context_load(pid, gps, NULL, NULL, NULL); 75 FAIL_IF(rc != pid); 76 i++; 77 } 78 79 return fail; 80 } 81 82 int main(void) 83 { 84 return test_harness(tm_signal_context_chk_gpr, "tm_signal_context_chk_gpr"); 85 } 86