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-rw-r--r--tools/testing/selftests/powerpc/tm/tm-vmxcopy.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/tm/tm-vmxcopy.c b/tools/testing/selftests/powerpc/tm/tm-vmxcopy.c
new file mode 100644
index 000000000..1640e7ead
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+++ b/tools/testing/selftests/powerpc/tm/tm-vmxcopy.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2015, Michael Neuling, IBM Corp.
+ *
+ * Original: Michael Neuling 4/12/2013
+ * Edited: Rashmica Gupta 4/12/2015
+ *
+ * See if the altivec state is leaked out of an aborted transaction due to
+ * kernel vmx copy loops.
+ *
+ * When the transaction aborts, VSR values should rollback to the values
+ * they held before the transaction commenced. Using VSRs while transaction
+ * is suspended should not affect the checkpointed values.
+ *
+ * (1) write A to a VSR
+ * (2) start transaction
+ * (3) suspend transaction
+ * (4) change the VSR to B
+ * (5) trigger kernel vmx copy loop
+ * (6) abort transaction
+ * (7) check that the VSR value is A
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <assert.h>
+
+#include "tm.h"
+#include "utils.h"
+
+int test_vmxcopy()
+{
+ long double vecin = 1.3;
+ long double vecout;
+ unsigned long pgsize = getpagesize();
+ int i;
+ int fd;
+ int size = pgsize*16;
+ char tmpfile[] = "/tmp/page_faultXXXXXX";
+ char buf[pgsize];
+ char *a;
+ uint64_t aborted = 0;
+
+ SKIP_IF(!have_htm());
+ SKIP_IF(htm_is_synthetic());
+ SKIP_IF(!is_ppc64le());
+
+ fd = mkstemp(tmpfile);
+ assert(fd >= 0);
+
+ memset(buf, 0, pgsize);
+ for (i = 0; i < size; i += pgsize)
+ assert(write(fd, buf, pgsize) == pgsize);
+
+ unlink(tmpfile);
+
+ a = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
+ assert(a != MAP_FAILED);
+
+ asm __volatile__(
+ "lxvd2x 40,0,%[vecinptr];" /* set 40 to initial value*/
+ "tbegin.;"
+ "beq 3f;"
+ "tsuspend.;"
+ "xxlxor 40,40,40;" /* set 40 to 0 */
+ "std 5, 0(%[map]);" /* cause kernel vmx copy page */
+ "tabort. 0;"
+ "tresume.;"
+ "tend.;"
+ "li %[res], 0;"
+ "b 5f;"
+
+ /* Abort handler */
+ "3:;"
+ "li %[res], 1;"
+
+ "5:;"
+ "stxvd2x 40,0,%[vecoutptr];"
+ : [res]"=&r"(aborted)
+ : [vecinptr]"r"(&vecin),
+ [vecoutptr]"r"(&vecout),
+ [map]"r"(a)
+ : "memory", "r0", "r3", "r4", "r5", "r6", "r7");
+
+ if (aborted && (vecin != vecout)){
+ printf("FAILED: vector state leaked on abort %f != %f\n",
+ (double)vecin, (double)vecout);
+ return 1;
+ }
+
+ munmap(a, size);
+
+ close(fd);
+
+ return 0;
+}
+
+int main(void)
+{
+ return test_harness(test_vmxcopy, "tm_vmxcopy");
+}