/* * Copyright 2015, Michael Neuling, IBM Corp. * Licensed under GPLv2. * * Test the kernel's signal return code to ensure that it doesn't * crash when both the transactional and suspend MSR bits are set in * the signal context. * * For this test, we send ourselves a SIGUSR1. In the SIGUSR1 handler * we modify the signal context to set both MSR TM S and T bits (which * is "reserved" by the PowerISA). When we return from the signal * handler (implicit sigreturn), the kernel should detect reserved MSR * value and send us with a SIGSEGV. */ #include #include #include #include #include "utils.h" #include "tm.h" int segv_expected = 0; void signal_segv(int signum) { if (segv_expected && (signum == SIGSEGV)) _exit(0); _exit(1); } void signal_usr1(int signum, siginfo_t *info, void *uc) { ucontext_t *ucp = uc; /* Link tm checkpointed context to normal context */ ucp->uc_link = ucp; /* Set all TM bits so that the context is now invalid */ #ifdef __powerpc64__ ucp->uc_mcontext.gp_regs[PT_MSR] |= (7ULL << 32); #else ucp->uc_mcontext.uc_regs->gregs[PT_MSR] |= (7ULL); #endif /* Should segv on return becuase of invalid context */ segv_expected = 1; } int tm_signal_msr_resv() { struct sigaction act; SKIP_IF(!have_htm()); act.sa_sigaction = signal_usr1; sigemptyset(&act.sa_mask); act.sa_flags = SA_SIGINFO; if (sigaction(SIGUSR1, &act, NULL) < 0) { perror("sigaction sigusr1"); exit(1); } if (signal(SIGSEGV, signal_segv) == SIG_ERR) exit(1); raise(SIGUSR1); /* We shouldn't get here as we exit in the segv handler */ return 1; } int main(void) { return test_harness(tm_signal_msr_resv, "tm_signal_msr_resv"); } d=f9a42e0d58cf0fe3d902e63d4582f2ea4cd2bb8b'>refslog tree commit diff

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