selftests/powerpc: Add memcmp testcase

Add a testcase for the new ppc64 memcmp.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

6 files changed, 133 insertions, 1 deletions

diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile
index f6ff90a76bd7..1d5e7ad2c460 100644
--- a/tools/testing/selftests/powerpc/Makefile
+++ b/tools/testing/selftests/powerpc/Makefile
@@ -13,7 +13,7 @@ CFLAGS := -Wall -O2 -flto -Wall -Werror -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CUR
 
 export CC CFLAGS
 
-TARGETS = pmu copyloops mm tm primitives
+TARGETS = pmu copyloops mm tm primitives stringloops
 
 endif
 
diff --git a/tools/testing/selftests/powerpc/stringloops/.gitignore b/tools/testing/selftests/powerpc/stringloops/.gitignore
new file mode 100644
index 000000000000..0b43da74ee46
--- /dev/null
+++ b/tools/testing/selftests/powerpc/stringloops/.gitignore
@@ -0,0 +1 @@
+memcmp
diff --git a/tools/testing/selftests/powerpc/stringloops/Makefile b/tools/testing/selftests/powerpc/stringloops/Makefile
new file mode 100644
index 000000000000..506d77346477
--- /dev/null
+++ b/tools/testing/selftests/powerpc/stringloops/Makefile
@@ -0,0 +1,20 @@
+# The loops are all 64-bit code
+CFLAGS += -m64
+CFLAGS += -I$(CURDIR)
+
+PROGS := memcmp
+EXTRA_SOURCES := memcmp_64.S ../harness.c
+
+all: $(PROGS)
+
+$(PROGS): $(EXTRA_SOURCES)
+
+run_tests: all
+        @-for PROG in $(PROGS); do \
+                ./$$PROG; \
+        done;
+
+clean:
+        rm -f $(PROGS) *.o
+
+.PHONY: all run_tests clean
diff --git a/tools/testing/selftests/powerpc/stringloops/asm/ppc_asm.h b/tools/testing/selftests/powerpc/stringloops/asm/ppc_asm.h
new file mode 100644
index 000000000000..11bece87e880
--- /dev/null
+++ b/tools/testing/selftests/powerpc/stringloops/asm/ppc_asm.h
@@ -0,0 +1,7 @@
+#include <ppc-asm.h>
+
+#ifndef r1
+#define r1 sp
+#endif
+
+#define _GLOBAL(A) FUNC_START(test_ ## A)
diff --git a/tools/testing/selftests/powerpc/stringloops/memcmp.c b/tools/testing/selftests/powerpc/stringloops/memcmp.c
new file mode 100644
index 000000000000..17417dd70708
--- /dev/null
+++ b/tools/testing/selftests/powerpc/stringloops/memcmp.c
@@ -0,0 +1,103 @@
+#include <malloc.h>
+#include <stdlib.h>
+#include <string.h>
+#include "../utils.h"
+
+#define SIZE 256
+#define ITERATIONS 10000
+
+int test_memcmp(const void *s1, const void *s2, size_t n);
+
+/* test all offsets and lengths */
+static void test_one(char *s1, char *s2)
+{
+        unsigned long offset, size;
+
+        for (offset = 0; offset < SIZE; offset++) {
+                for (size = 0; size < (SIZE-offset); size++) {
+                        int x, y;
+                        unsigned long i;
+
+                        y = memcmp(s1+offset, s2+offset, size);
+                        x = test_memcmp(s1+offset, s2+offset, size);
+
+                        if (((x ^ y) < 0) &&    /* Trick to compare sign */
+                                ((x | y) != 0)) { /* check for zero */
+                                printf("memcmp returned %d, should have returned %d (offset %ld size %ld)\n", x, y, offset, size);
+
+                                for (i = offset; i < offset+size; i++)
+                                        printf("%02x ", s1[i]);
+                                printf("\n");
+
+                                for (i = offset; i < offset+size; i++)
+                                        printf("%02x ", s2[i]);
+                                printf("\n");
+                                abort();
+                        }
+                }
+        }
+}
+
+static int testcase(void)
+{
+        char *s1;
+        char *s2;
+        unsigned long i;
+
+        s1 = memalign(128, SIZE);
+        if (!s1) {
+                perror("memalign");
+                exit(1);
+        }
+
+        s2 = memalign(128, SIZE);
+        if (!s2) {
+                perror("memalign");
+                exit(1);
+        }
+
+        srandom(1);
+
+        for (i = 0; i < ITERATIONS; i++) {
+                unsigned long j;
+                unsigned long change;
+
+                for (j = 0; j < SIZE; j++)
+                        s1[j] = random();
+
+                memcpy(s2, s1, SIZE);
+
+                /* change one byte */
+                change = random() % SIZE;
+                s2[change] = random() & 0xff;
+
+                test_one(s1, s2);
+        }
+
+        srandom(1);
+
+        for (i = 0; i < ITERATIONS; i++) {
+                unsigned long j;
+                unsigned long change;
+
+                for (j = 0; j < SIZE; j++)
+                        s1[j] = random();
+
+                memcpy(s2, s1, SIZE);
+
+                /* change multiple bytes, 1/8 of total */
+                for (j = 0; j < SIZE / 8; j++) {
+                        change = random() % SIZE;
+                        s2[change] = random() & 0xff;
+                }
+
+                test_one(s1, s2);
+        }
+
+        return 0;
+}
+
+int main(void)
+{
+        return test_harness(testcase, "memcmp");
+}
diff --git a/tools/testing/selftests/powerpc/stringloops/memcmp_64.S b/tools/testing/selftests/powerpc/stringloops/memcmp_64.S
new file mode 120000
index 000000000000..9bc87e438ae9
--- /dev/null
+++ b/tools/testing/selftests/powerpc/stringloops/memcmp_64.S
@@ -0,0 +1 @@
+../../../../../arch/powerpc/lib/memcmp_64.S
\ No newline at end of file