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authorMichael Neuling <mikey@neuling.org>2015-11-20 15:15:33 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2015-12-14 20:41:48 +1100
commit25007a69e852389985ee98235e76d740d4821c6c (patch)
tree16dd7664889f9bcec4d30fafe234a32a734520cc /tools
parentb319ee8445961c5f7b2fd199c0ef99c418ee2d4a (diff)
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selftests/powerpc: Add TM signal return test
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. Signed-off-by: Michael Neuling <mikey@neuling.org> Tested-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> [mpe: Skip if we don't have TM] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/powerpc/tm/.gitignore1
-rw-r--r--tools/testing/selftests/powerpc/tm/Makefile2
-rw-r--r--tools/testing/selftests/powerpc/tm/tm-signal-msr-resv.c74
3 files changed, 76 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/tm/.gitignore b/tools/testing/selftests/powerpc/tm/.gitignore
index 2699635d2cd9..61c318fdace4 100644
--- a/tools/testing/selftests/powerpc/tm/.gitignore
+++ b/tools/testing/selftests/powerpc/tm/.gitignore
@@ -1,2 +1,3 @@
tm-resched-dscr
tm-syscall
+tm-signal-msr-resv
diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile
index 63b55d01da35..c6b4ca8b2812 100644
--- a/tools/testing/selftests/powerpc/tm/Makefile
+++ b/tools/testing/selftests/powerpc/tm/Makefile
@@ -1,4 +1,4 @@
-TEST_PROGS := tm-resched-dscr tm-syscall
+TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv
all: $(TEST_PROGS)
diff --git a/tools/testing/selftests/powerpc/tm/tm-signal-msr-resv.c b/tools/testing/selftests/powerpc/tm/tm-signal-msr-resv.c
new file mode 100644
index 000000000000..d86653f282b1
--- /dev/null
+++ b/tools/testing/selftests/powerpc/tm/tm-signal-msr-resv.c
@@ -0,0 +1,74 @@
+/*
+ * 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 <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+
+#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.regs->gpr[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");
+}