// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2016, Cyril Bur, IBM Corp.
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*
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* Test the kernel's signal frame code.
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*
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* The kernel sets up two sets of ucontexts if the signal was to be
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* delivered while the thread was in a transaction (referred too as
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* first and second contexts).
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* Expected behaviour is that the checkpointed state is in the user
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* context passed to the signal handler (first context). The speculated
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* state can be accessed with the uc_link pointer (second context).
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*
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* The rationale for this is that if TM unaware code (which linked
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* against TM libs) installs a signal handler it will not know of the
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* speculative nature of the 'live' registers and may infer the wrong
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* thing.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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#include <altivec.h>
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#include "utils.h"
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#include "tm.h"
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#define MAX_ATTEMPT 500000
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#define NV_GPR_REGS 18 /* Number of non-volatile GPR registers */
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#define R14 14 /* First non-volatile register to check in r14-r31 subset */
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long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
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static sig_atomic_t fail, broken;
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/* Test only non-volatile general purpose registers, i.e. r14-r31 */
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static long gprs[] = {
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/* First context will be set with these values, i.e. non-speculative */
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/* R14, R15, ... */
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
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/* Second context will be set with these values, i.e. speculative */
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/* R14, R15, ... */
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-1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18
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};
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static void signal_usr1(int signum, siginfo_t *info, void *uc)
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{
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int i;
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ucontext_t *ucp = uc;
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ucontext_t *tm_ucp = ucp->uc_link;
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/* Check first context. Print all mismatches. */
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for (i = 0; i < NV_GPR_REGS; i++) {
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fail = (ucp->uc_mcontext.gp_regs[R14 + i] != gprs[i]);
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if (fail) {
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broken = 1;
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printf("GPR%d (1st context) == %lu instead of %lu (expected)\n",
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R14 + i, ucp->uc_mcontext.gp_regs[R14 + i], gprs[i]);
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}
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}
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/* Check second context. Print all mismatches. */
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for (i = 0; i < NV_GPR_REGS; i++) {
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fail = (tm_ucp->uc_mcontext.gp_regs[R14 + i] != gprs[NV_GPR_REGS + i]);
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if (fail) {
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broken = 1;
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printf("GPR%d (2nd context) == %lu instead of %lu (expected)\n",
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R14 + i, tm_ucp->uc_mcontext.gp_regs[R14 + i], gprs[NV_GPR_REGS + i]);
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}
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}
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}
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static int tm_signal_context_chk_gpr()
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{
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struct sigaction act;
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int i;
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long rc;
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pid_t pid = getpid();
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SKIP_IF(!have_htm());
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act.sa_sigaction = signal_usr1;
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sigemptyset(&act.sa_mask);
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act.sa_flags = SA_SIGINFO;
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if (sigaction(SIGUSR1, &act, NULL) < 0) {
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perror("sigaction sigusr1");
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exit(1);
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}
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i = 0;
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while (i < MAX_ATTEMPT && !broken) {
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/*
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* tm_signal_self_context_load will set both first and second
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* contexts accordingly to the values passed through non-NULL
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* array pointers to it, in that case 'gprs', and invoke the
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* signal handler installed for SIGUSR1.
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*/
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rc = tm_signal_self_context_load(pid, gprs, NULL, NULL, NULL);
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FAIL_IF(rc != pid);
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i++;
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}
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return broken;
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}
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int main(void)
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{
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return test_harness(tm_signal_context_chk_gpr, "tm_signal_context_chk_gpr");
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}
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