diff options
Diffstat (limited to 'tools/testing/selftests/powerpc/stringloops/memcmp.c')
| -rw-r--r-- | tools/testing/selftests/powerpc/stringloops/memcmp.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/stringloops/memcmp.c b/tools/testing/selftests/powerpc/stringloops/memcmp.c new file mode 100644 index 000000000..cb2f18855 --- /dev/null +++ b/tools/testing/selftests/powerpc/stringloops/memcmp.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <malloc.h> +#include <stdlib.h> +#include <string.h> +#include <sys/mman.h> +#include <time.h> + +#include "utils.h" + +#define SIZE 256 +#define ITERATIONS 10000 + +#define LARGE_SIZE (5 * 1024) +#define LARGE_ITERATIONS 1000 +#define LARGE_MAX_OFFSET 32 +#define LARGE_SIZE_START 4096 + +/* This is big enough to fit LARGE_SIZE and works on 4K & 64K kernels */ +#define MAP_SIZE (64 * 1024) + +#define MAX_OFFSET_DIFF_S1_S2 48 + +int vmx_count; +int enter_vmx_ops(void) +{ + vmx_count++; + return 1; +} + +void exit_vmx_ops(void) +{ + vmx_count--; +} +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 max_offset, + unsigned long size_start, unsigned long max_size) +{ + unsigned long offset, size; + + for (offset = 0; offset < max_offset; offset++) { + for (size = size_start; size < (max_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(); + } + + if (vmx_count != 0) { + printf("vmx enter/exit not paired.(offset:%ld size:%ld s1:%p s2:%p vc:%d\n", + offset, size, s1, s2, vmx_count); + printf("\n"); + abort(); + } + } + } +} + +static int testcase(bool islarge) +{ + unsigned long i, comp_size, alloc_size; + char *p, *s1, *s2; + int iterations; + + comp_size = (islarge ? LARGE_SIZE : SIZE); + alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2; + iterations = islarge ? LARGE_ITERATIONS : ITERATIONS; + + p = mmap(NULL, 4 * MAP_SIZE, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); + FAIL_IF(p == MAP_FAILED); + + /* Put s1/s2 at the end of a page */ + s1 = p + MAP_SIZE - alloc_size; + s2 = p + 3 * MAP_SIZE - alloc_size; + + /* And unmap the subsequent page to force a fault if we overread */ + munmap(p + MAP_SIZE, MAP_SIZE); + munmap(p + 3 * MAP_SIZE, MAP_SIZE); + + srandom(time(0)); + + for (i = 0; i < iterations; i++) { + unsigned long j; + unsigned long change; + char *rand_s1 = s1; + char *rand_s2 = s2; + + for (j = 0; j < alloc_size; j++) + s1[j] = random(); + + rand_s1 += random() % MAX_OFFSET_DIFF_S1_S2; + rand_s2 += random() % MAX_OFFSET_DIFF_S1_S2; + memcpy(rand_s2, rand_s1, comp_size); + + /* change one byte */ + change = random() % comp_size; + rand_s2[change] = random() & 0xff; + + if (islarge) + test_one(rand_s1, rand_s2, LARGE_MAX_OFFSET, + LARGE_SIZE_START, comp_size); + else + test_one(rand_s1, rand_s2, SIZE, 0, comp_size); + } + + srandom(time(0)); + + for (i = 0; i < iterations; i++) { + unsigned long j; + unsigned long change; + char *rand_s1 = s1; + char *rand_s2 = s2; + + for (j = 0; j < alloc_size; j++) + s1[j] = random(); + + rand_s1 += random() % MAX_OFFSET_DIFF_S1_S2; + rand_s2 += random() % MAX_OFFSET_DIFF_S1_S2; + memcpy(rand_s2, rand_s1, comp_size); + + /* change multiple bytes, 1/8 of total */ + for (j = 0; j < comp_size / 8; j++) { + change = random() % comp_size; + s2[change] = random() & 0xff; + } + + if (islarge) + test_one(rand_s1, rand_s2, LARGE_MAX_OFFSET, + LARGE_SIZE_START, comp_size); + else + test_one(rand_s1, rand_s2, SIZE, 0, comp_size); + } + + return 0; +} + +static int testcases(void) +{ +#ifdef __powerpc64__ + // vcmpequd used in memcmp_64.S is v2.07 + SKIP_IF(!have_hwcap2(PPC_FEATURE2_ARCH_2_07)); +#endif + + testcase(0); + testcase(1); + return 0; +} + +int main(void) +{ + test_harness_set_timeout(300); + return test_harness(testcases, "memcmp"); +} |