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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 <string.h>23#include <signal.h>24#include <unistd.h>25 26#include <altivec.h>27 28#include "utils.h"29#include "tm.h"30 31#define MAX_ATTEMPT 50000032 33#define NV_VMX_REGS 12 /* Number of non-volatile VMX registers */34#define VMX20 20 /* First non-volatile register to check in vr20-31 subset */35 36long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);37 38static sig_atomic_t fail, broken;39 40/* Test only non-volatile registers, i.e. 12 vmx registers from vr20 to vr31 */41vector int vms[] = {42 /* First context will be set with these values, i.e. non-speculative */43 /* VMX20 , VMX21 , ... */44 { 1, 2, 3, 4},{ 5, 6, 7, 8},{ 9,10,11,12},45 {13,14,15,16},{17,18,19,20},{21,22,23,24},46 {25,26,27,28},{29,30,31,32},{33,34,35,36},47 {37,38,39,40},{41,42,43,44},{45,46,47,48},48 /* Second context will be set with these values, i.e. speculative */49 /* VMX20 , VMX21 , ... */50 { -1, -2, -3, -4},{ -5, -6, -7, -8},{ -9,-10,-11,-12},51 {-13,-14,-15,-16},{-17,-18,-19,-20},{-21,-22,-23,-24},52 {-25,-26,-27,-28},{-29,-30,-31,-32},{-33,-34,-35,-36},53 {-37,-38,-39,-40},{-41,-42,-43,-44},{-45,-46,-47,-48}54};55 56static void signal_usr1(int signum, siginfo_t *info, void *uc)57{58 int i, j;59 ucontext_t *ucp = uc;60 ucontext_t *tm_ucp = ucp->uc_link;61 62 for (i = 0; i < NV_VMX_REGS; i++) {63 /* Check first context. Print all mismatches. */64 fail = memcmp(ucp->uc_mcontext.v_regs->vrregs[VMX20 + i],65 &vms[i], sizeof(vector int));66 if (fail) {67 broken = 1;68 printf("VMX%d (1st context) == 0x", VMX20 + i);69 /* Print actual value in first context. */70 for (j = 0; j < 4; j++)71 printf("%08x", ucp->uc_mcontext.v_regs->vrregs[VMX20 + i][j]);72 printf(" instead of 0x");73 /* Print expected value. */74 for (j = 0; j < 4; j++)75 printf("%08x", vms[i][j]);76 printf(" (expected)\n");77 }78 }79 80 for (i = 0; i < NV_VMX_REGS; i++) {81 /* Check second context. Print all mismatches. */82 fail = memcmp(tm_ucp->uc_mcontext.v_regs->vrregs[VMX20 + i],83 &vms[NV_VMX_REGS + i], sizeof (vector int));84 if (fail) {85 broken = 1;86 printf("VMX%d (2nd context) == 0x", NV_VMX_REGS + i);87 /* Print actual value in second context. */88 for (j = 0; j < 4; j++)89 printf("%08x", tm_ucp->uc_mcontext.v_regs->vrregs[VMX20 + i][j]);90 printf(" instead of 0x");91 /* Print expected value. */92 for (j = 0; j < 4; j++)93 printf("%08x", vms[NV_VMX_REGS + i][j]);94 printf(" (expected)\n");95 }96 }97}98 99static int tm_signal_context_chk()100{101 struct sigaction act;102 int i;103 long rc;104 pid_t pid = getpid();105 106 SKIP_IF(!have_htm());107 SKIP_IF(htm_is_synthetic());108 109 act.sa_sigaction = signal_usr1;110 sigemptyset(&act.sa_mask);111 act.sa_flags = SA_SIGINFO;112 if (sigaction(SIGUSR1, &act, NULL) < 0) {113 perror("sigaction sigusr1");114 exit(1);115 }116 117 i = 0;118 while (i < MAX_ATTEMPT && !broken) {119 /*120 * tm_signal_self_context_load will set both first and second121 * contexts accordingly to the values passed through non-NULL122 * array pointers to it, in that case 'vms', and invoke the123 * signal handler installed for SIGUSR1.124 */125 rc = tm_signal_self_context_load(pid, NULL, NULL, vms, NULL);126 FAIL_IF(rc != pid);127 i++;128 }129 130 return (broken);131}132 133int main(void)134{135 return test_harness(tm_signal_context_chk, "tm_signal_context_chk_vmx");136}137