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authorCyril Bur <cyrilbur@gmail.com>2016-09-23 16:18:21 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-10-04 20:33:14 +1100
commit5ca4ffcd5cee39af6b0b3ccfea59ebfffb5c2ad5 (patch)
treecd28250646fa15099fc6ce26f6c8ba404cda0014 /tools
parentf10d4424b20c101f3b4dd599819083e1e4b5a3fa (diff)
downloadlinux-5ca4ffcd5cee39af6b0b3ccfea59ebfffb5c2ad5.tar.bz2
selftests/powerpc: Add checks for transactional FPUs in signal contexts
If a thread receives a signal while transactional the kernel creates a second context to show the transactional state of the process. This test loads some known values and waits for a signal and confirms that the expected values are in the signal context. Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/powerpc/tm/Makefile2
-rw-r--r--tools/testing/selftests/powerpc/tm/tm-signal-context-chk-fpu.c92
2 files changed, 93 insertions, 1 deletions
diff --git a/tools/testing/selftests/powerpc/tm/Makefile b/tools/testing/selftests/powerpc/tm/Makefile
index e1204f6f9175..d5d983f991a4 100644
--- a/tools/testing/selftests/powerpc/tm/Makefile
+++ b/tools/testing/selftests/powerpc/tm/Makefile
@@ -1,4 +1,4 @@
-SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr
+SIGNAL_CONTEXT_CHK_TESTS := tm-signal-context-chk-gpr tm-signal-context-chk-fpu
TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \
tm-vmxcopy tm-fork tm-tar tm-tmspr $(SIGNAL_CONTEXT_CHK_TESTS)
diff --git a/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-fpu.c b/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-fpu.c
new file mode 100644
index 000000000000..c760debbd5ad
--- /dev/null
+++ b/tools/testing/selftests/powerpc/tm/tm-signal-context-chk-fpu.c
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2016, Cyril Bur, IBM Corp.
+ *
+ * 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.
+ *
+ *
+ * Test the kernel's signal frame code.
+ *
+ * The kernel sets up two sets of ucontexts if the signal was to be
+ * delivered while the thread was in a transaction.
+ * Expected behaviour is that the checkpointed state is in the user
+ * context passed to the signal handler. The speculated state can be
+ * accessed with the uc_link pointer.
+ *
+ * The rationale for this is that if TM unaware code (which linked
+ * against TM libs) installs a signal handler it will not know of the
+ * speculative nature of the 'live' registers and may infer the wrong
+ * thing.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include <altivec.h>
+
+#include "utils.h"
+#include "tm.h"
+
+#define MAX_ATTEMPT 500000
+
+#define NV_FPU_REGS 18
+
+long tm_signal_self_context_load(pid_t pid, long *gprs, double *fps, vector int *vms, vector int *vss);
+
+/* Be sure there are 2x as many as there are NV FPU regs (2x18) */
+static double fps[] = {
+ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18,
+ -1,-2,-3,-4,-5,-6,-7,-8,-9,-10,-11,-12,-13,-14,-15,-16,-17,-18
+};
+
+static sig_atomic_t fail;
+
+static void signal_usr1(int signum, siginfo_t *info, void *uc)
+{
+ int i;
+ ucontext_t *ucp = uc;
+ ucontext_t *tm_ucp = ucp->uc_link;
+
+ for (i = 0; i < NV_FPU_REGS && !fail; i++) {
+ fail = (ucp->uc_mcontext.fp_regs[i + 14] != fps[i]);
+ fail |= (tm_ucp->uc_mcontext.fp_regs[i + 14] != fps[i + NV_FPU_REGS]);
+ if (fail)
+ 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]);
+ }
+}
+
+static int tm_signal_context_chk_fpu()
+{
+ struct sigaction act;
+ int i;
+ long rc;
+ pid_t pid = getpid();
+
+ 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);
+ }
+
+ i = 0;
+ while (i < MAX_ATTEMPT && !fail) {
+ rc = tm_signal_self_context_load(pid, NULL, fps, NULL, NULL);
+ FAIL_IF(rc != pid);
+ i++;
+ }
+
+ return fail;
+}
+
+int main(void)
+{
+ return test_harness(tm_signal_context_chk_fpu, "tm_signal_context_chk_fpu");
+}