2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
// 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.
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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. The speculated state can be
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* accessed with the uc_link pointer.
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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_FPU_REGS 18
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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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/* Be sure there are 2x as many as there are NV FPU regs (2x18) */
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static double fps[] = {
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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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-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 sig_atomic_t fail;
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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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for (i = 0; i < NV_FPU_REGS && !fail; i++) {
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fail = (ucp->uc_mcontext.fp_regs[i + 14] != fps[i]);
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fail |= (tm_ucp->uc_mcontext.fp_regs[i + 14] != fps[i + NV_FPU_REGS]);
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if (fail)
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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]);
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}
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}
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static int tm_signal_context_chk_fpu()
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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 && !fail) {
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rc = tm_signal_self_context_load(pid, NULL, fps, NULL, NULL);
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FAIL_IF(rc != pid);
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i++;
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}
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return fail;
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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_fpu, "tm_signal_context_chk_fpu");
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}
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