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74 lines
1.7 KiB
74 lines
1.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2015, Michael Neuling, IBM Corp. |
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* |
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* Test the kernel's signal return code to ensure that it doesn't |
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* crash when both the transactional and suspend MSR bits are set in |
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* the signal context. |
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* |
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* For this test, we send ourselves a SIGUSR1. In the SIGUSR1 handler |
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* we modify the signal context to set both MSR TM S and T bits (which |
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* is "reserved" by the PowerISA). When we return from the signal |
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* handler (implicit sigreturn), the kernel should detect reserved MSR |
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* value and send us with a SIGSEGV. |
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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 "utils.h" |
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#include "tm.h" |
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int segv_expected = 0; |
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void signal_segv(int signum) |
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{ |
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if (segv_expected && (signum == SIGSEGV)) |
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_exit(0); |
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_exit(1); |
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} |
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void signal_usr1(int signum, siginfo_t *info, void *uc) |
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{ |
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ucontext_t *ucp = uc; |
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/* Link tm checkpointed context to normal context */ |
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ucp->uc_link = ucp; |
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/* Set all TM bits so that the context is now invalid */ |
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#ifdef __powerpc64__ |
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ucp->uc_mcontext.gp_regs[PT_MSR] |= (7ULL << 32); |
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#else |
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ucp->uc_mcontext.uc_regs->gregs[PT_MSR] |= (7ULL); |
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#endif |
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/* Should segv on return becuase of invalid context */ |
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segv_expected = 1; |
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} |
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int tm_signal_msr_resv() |
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{ |
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struct sigaction act; |
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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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if (signal(SIGSEGV, signal_segv) == SIG_ERR) |
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exit(1); |
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raise(SIGUSR1); |
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/* We shouldn't get here as we exit in the segv handler */ |
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return 1; |
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} |
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int main(void) |
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{ |
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return test_harness(tm_signal_msr_resv, "tm_signal_msr_resv"); |
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}
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