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 <cyril...@gmail.com>
---
 tools/testing/selftests/powerpc/tm/Makefile        |  2 +-
 .../powerpc/tm/tm-signal-context-chk-fpu.c         | 92 ++++++++++++++++++++++
 2 files changed, 93 insertions(+), 1 deletion(-)
 create mode 100644 
tools/testing/selftests/powerpc/tm/tm-signal-context-chk-fpu.c

diff --git a/tools/testing/selftests/powerpc/tm/Makefile 
b/tools/testing/selftests/powerpc/tm/Makefile
index 2b6fe8f..103648f 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 0000000..c760deb
--- /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");
+}
-- 
2.10.0

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