| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|
| 2 | /* |
|---|
| 3 | * Copyright 2015, Michael Neuling, IBM Corp. |
|---|
| 4 | * |
|---|
| 5 | * Test the kernel's signal return code to ensure that it doesn't |
|---|
| 6 | * crash when both the transactional and suspend MSR bits are set in |
|---|
| 7 | * the signal context. |
|---|
| 8 | * |
|---|
| 9 | * For this test, we send ourselves a SIGUSR1. In the SIGUSR1 handler |
|---|
| 10 | * we modify the signal context to set both MSR TM S and T bits (which |
|---|
| 11 | * is "reserved" by the PowerISA). When we return from the signal |
|---|
| 12 | * handler (implicit sigreturn), the kernel should detect reserved MSR |
|---|
| 13 | * value and send us with a SIGSEGV. |
|---|
| 14 | */ |
|---|
| 15 | |
|---|
| 16 | #include <stdlib.h> |
|---|
| 17 | #include <stdio.h> |
|---|
| 18 | #include <signal.h> |
|---|
| 19 | #include <unistd.h> |
|---|
| 20 | |
|---|
| 21 | #include "utils.h" |
|---|
| 22 | #include "tm.h" |
|---|
| 23 | |
|---|
| 24 | int segv_expected = 0; |
|---|
| 25 | |
|---|
| 26 | void signal_segv(int signum) |
|---|
| 27 | { |
|---|
| 28 | if (segv_expected && (signum == SIGSEGV)) |
|---|
| 29 | _exit(0); |
|---|
| 30 | _exit(1); |
|---|
| 31 | } |
|---|
| 32 | |
|---|
| 33 | void signal_usr1(int signum, siginfo_t *info, void *uc) |
|---|
| 34 | { |
|---|
| 35 | ucontext_t *ucp = uc; |
|---|
| 36 | |
|---|
| 37 | /* Link tm checkpointed context to normal context */ |
|---|
| 38 | ucp->uc_link = ucp; |
|---|
| 39 | /* Set all TM bits so that the context is now invalid */ |
|---|
| 40 | #ifdef __powerpc64__ |
|---|
| 41 | ucp->uc_mcontext.gp_regs[PT_MSR] |= (7ULL << 32); |
|---|
| 42 | #else |
|---|
| 43 | ucp->uc_mcontext.uc_regs->gregs[PT_MSR] |= (7ULL); |
|---|
| 44 | #endif |
|---|
| 45 | /* Should segv on return becuase of invalid context */ |
|---|
| 46 | segv_expected = 1; |
|---|
| 47 | } |
|---|
| 48 | |
|---|
| 49 | int tm_signal_msr_resv() |
|---|
| 50 | { |
|---|
| 51 | struct sigaction act; |
|---|
| 52 | |
|---|
| 53 | SKIP_IF(!have_htm()); |
|---|
| 54 | |
|---|
| 55 | act.sa_sigaction = signal_usr1; |
|---|
| 56 | sigemptyset(&act.sa_mask); |
|---|
| 57 | act.sa_flags = SA_SIGINFO; |
|---|
| 58 | if (sigaction(SIGUSR1, &act, NULL) < 0) { |
|---|
| 59 | perror("sigaction sigusr1" ); |
|---|
| 60 | exit(1); |
|---|
| 61 | } |
|---|
| 62 | if (signal(SIGSEGV, signal_segv) == SIG_ERR) |
|---|
| 63 | exit(1); |
|---|
| 64 | |
|---|
| 65 | raise(SIGUSR1); |
|---|
| 66 | |
|---|
| 67 | /* We shouldn't get here as we exit in the segv handler */ |
|---|
| 68 | return 1; |
|---|
| 69 | } |
|---|
| 70 | |
|---|
| 71 | int main(void) |
|---|
| 72 | { |
|---|
| 73 | return test_harness(tm_signal_msr_resv, "tm_signal_msr_resv" ); |
|---|
| 74 | } |
|---|
| 75 | |
|---|
