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1// SPDX-License-Identifier: GPL-2.0-or-later2/*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 be8 * delivered while the thread was in a transaction (referred too as9 * first and second contexts).10 * Expected behaviour is that the checkpointed state is in the user11 * context passed to the signal handler (first context). The speculated12 * state can be accessed with the uc_link pointer (second context).13 *14 * The rationale for this is that if TM unaware code (which linked15 * against TM libs) installs a signal handler it will not know of the16 * speculative nature of the 'live' registers and may infer the wrong17 * thing.18 */19 20#include <stdlib.h>21#include <stdio.h>22#include <signal.h>23#include <unistd.h>24 25#include <altivec.h>26 27#include "utils.h"28#include "tm.h"29 30#define MAX_ATTEMPT 50000031 32#define NV_FPU_REGS 18 /* Number of non-volatile FP registers */33#define FPR14 14 /* First non-volatile FP register to check in f14-31 subset */34 35long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);36 37/* Test only non-volatile registers, i.e. 18 fpr registers from f14 to f31 */38static double fps[] = {39 /* First context will be set with these values, i.e. non-speculative */40 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,41 /* Second context will be set with these values, i.e. speculative */42 -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-1843};44 45static sig_atomic_t fail, broken;46 47static void signal_usr1(int signum, siginfo_t *info, void *uc)48{49 int i;50 ucontext_t *ucp = uc;51 ucontext_t *tm_ucp = ucp->uc_link;52 53 for (i = 0; i < NV_FPU_REGS; i++) {54 /* Check first context. Print all mismatches. */55 fail = (ucp->uc_mcontext.fp_regs[FPR14 + i] != fps[i]);56 if (fail) {57 broken = 1;58 printf("FPR%d (1st context) == %g instead of %g (expected)\n",59 FPR14 + i, ucp->uc_mcontext.fp_regs[FPR14 + i], fps[i]);60 }61 }62 63 for (i = 0; i < NV_FPU_REGS; i++) {64 /* Check second context. Print all mismatches. */65 fail = (tm_ucp->uc_mcontext.fp_regs[FPR14 + i] != fps[NV_FPU_REGS + i]);66 if (fail) {67 broken = 1;68 printf("FPR%d (2nd context) == %g instead of %g (expected)\n",69 FPR14 + i, tm_ucp->uc_mcontext.fp_regs[FPR14 + i], fps[NV_FPU_REGS + i]);70 }71 }72}73 74static int tm_signal_context_chk_fpu()75{76 struct sigaction act;77 int i;78 long rc;79 pid_t pid = getpid();80 81 SKIP_IF(!have_htm());82 SKIP_IF(htm_is_synthetic());83 84 act.sa_sigaction = signal_usr1;85 sigemptyset(&act.sa_mask);86 act.sa_flags = SA_SIGINFO;87 if (sigaction(SIGUSR1, &act, NULL) < 0) {88 perror("sigaction sigusr1");89 exit(1);90 }91 92 i = 0;93 while (i < MAX_ATTEMPT && !broken) {94 /*95 * tm_signal_self_context_load will set both first and second96 * contexts accordingly to the values passed through non-NULL97 * array pointers to it, in that case 'fps', and invoke the98 * signal handler installed for SIGUSR1.99 */100 rc = tm_signal_self_context_load(pid, NULL, fps, NULL, NULL);101 FAIL_IF(rc != pid);102 i++;103 }104 105 return (broken);106}107 108int main(void)109{110 return test_harness(tm_signal_context_chk_fpu, "tm_signal_context_chk_fpu");111}112