Ensure that kernel is throwing away the suspended transaction when
sigreturn() is called otherwise it if fails to restore the signal
frame's TM SPRS.
Signed-off-by: Laurent Dufour <lduf...@linux.vnet.ibm.com>
---
tools/testing/selftests/powerpc/tm/Makefile | 2 +-
tools/testing/selftests/powerpc/tm/tm-sigreturn.c | 89 +++++++++++++++++++++++
2 files changed, 90 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/powerpc/tm/tm-sigreturn.c
diff --git a/tools/testing/selftests/powerpc/tm/Makefile
b/tools/testing/selftests/powerpc/tm/Makefile
index 9d301d785d9e..5e0396d79c8a 100644
--- a/tools/testing/selftests/powerpc/tm/Makefile
+++ b/tools/testing/selftests/powerpc/tm/Makefile
@@ -1,5 +1,5 @@
TEST_PROGS := tm-resched-dscr tm-syscall tm-signal-msr-resv tm-signal-stack \
- tm-vmxcopy tm-fork tm-tar tm-tmspr tm-exec tm-execed
+ tm-vmxcopy tm-fork tm-tar tm-tmspr tm-exec tm-execed tm-sigreturn
all: $(TEST_PROGS)
diff --git a/tools/testing/selftests/powerpc/tm/tm-sigreturn.c
b/tools/testing/selftests/powerpc/tm/tm-sigreturn.c
new file mode 100644
index 000000000000..43fa83de23a5
--- /dev/null
+++ b/tools/testing/selftests/powerpc/tm/tm-sigreturn.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2015, Laurent Dufour, IBM Corp.
+ * Licensed under GPLv2.
+ *
+ * Test the kernel's signal returning code to check reclaim is done if
+ * the sigreturn() is called while in a transaction (suspended since active
+ * is already dropped trough the system call path).
+ *
+ * The kernel must discard the transaction when entering sigreturn,
+ * since restoring the potential TM SPRS from the signal frame is requiring to
+ * not be in a transaction.
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <signal.h>
+#include <string.h>
+
+#include "utils.h"
+#include "tm.h"
+
+
+void handler(int sig)
+{
+ uint64_t ret;
+
+ asm __volatile__(
+ "li 3,1 ;"
+ "tbegin. ;"
+ "beq 1f ;"
+ "li 3,0 ;"
+ "tsuspend. ;"
+ "1: ;"
+ "std%X[ret] 3, %[ret] ;"
+ : [ret]"=m"(ret)
+ :
+ : "memory", "3", "cr0");
+
+ if (ret)
+ exit(1);
+
+ /*
+ * We return from the signal handle while in a suspended transaction
+ */
+}
+
+
+int tm_sigreturn(void)
+{
+ struct sigaction sa;
+ uint64_t ret = 0;
+
+ memset(&sa, 0, sizeof(sa));
+ sa.sa_handler = handler;
+ sigemptyset(&sa.sa_mask);
+
+ if (sigaction(SIGSEGV, &sa, NULL))
+ exit(1);
+
+ asm __volatile__(
+ "tbegin. ;"
+ "beq 1f ;"
+ "li 3,0 ;"
+ "std 3,0(3) ;" /* trigger SEGV */
+ "li 3,1 ;"
+ "std%X[ret] 3,%[ret] ;"
+ "tend. ;"
+ "b 2f ;"
+ "1: ;"
+ "li 3,2 ;"
+ "std%X[ret] 3,%[ret] ;"
+ "2: ;"
+ : [ret]"=m"(ret)
+ :
+ : "memory", "3", "cr0");
+
+ if (ret != 2)
+ exit(1);
+
+ exit(0);
+}
+
+int main(void)
+{
+ return test_harness(tm_sigreturn, "tm_sigreturn");
+}
--
2.7.4
