LXR linux/tools/testing/selftests/powerpc/stringloops/memcmp.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <malloc.h>
   3#include <stdlib.h>
   4#include <string.h>
   5#include <time.h>
   6#include "utils.h"
   7
   8#define SIZE 256
   9#define ITERATIONS 10000
  10
  11#define LARGE_SIZE (5 * 1024)
  12#define LARGE_ITERATIONS 1000
  13#define LARGE_MAX_OFFSET 32
  14#define LARGE_SIZE_START 4096
  15
  16#define MAX_OFFSET_DIFF_S1_S2 48
  17
  18int vmx_count;
  19int enter_vmx_ops(void)
  20{
  21        vmx_count++;
  22        return 1;
  23}
  24
  25void exit_vmx_ops(void)
  26{
  27        vmx_count--;
  28}
  29int test_memcmp(const void *s1, const void *s2, size_t n);
  30
  31/* test all offsets and lengths */
  32static void test_one(char *s1, char *s2, unsigned long max_offset,
  33                unsigned long size_start, unsigned long max_size)
  34{
  35        unsigned long offset, size;
  36
  37        for (offset = 0; offset < max_offset; offset++) {
  38                for (size = size_start; size < (max_size - offset); size++) {
  39                        int x, y;
  40                        unsigned long i;
  41
  42                        y = memcmp(s1+offset, s2+offset, size);
  43                        x = test_memcmp(s1+offset, s2+offset, size);
  44
  45                        if (((x ^ y) < 0) &&    /* Trick to compare sign */
  46                                ((x | y) != 0)) { /* check for zero */
  47                                printf("memcmp returned %d, should have returned %d (offset %ld size %ld)\n", x, y, offset, size);
  48
  49                                for (i = offset; i < offset+size; i++)
  50                                        printf("%02x ", s1[i]);
  51                                printf("\n");
  52
  53                                for (i = offset; i < offset+size; i++)
  54                                        printf("%02x ", s2[i]);
  55                                printf("\n");
  56                                abort();
  57                        }
  58
  59                        if (vmx_count != 0) {
  60                                printf("vmx enter/exit not paired.(offset:%ld size:%ld s1:%p s2:%p vc:%d\n",
  61                                        offset, size, s1, s2, vmx_count);
  62                                printf("\n");
  63                                abort();
  64                        }
  65                }
  66        }
  67}
  68
  69static int testcase(bool islarge)
  70{
  71        char *s1;
  72        char *s2;
  73        unsigned long i;
  74
  75        unsigned long comp_size = (islarge ? LARGE_SIZE : SIZE);
  76        unsigned long alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2;
  77        int iterations = islarge ? LARGE_ITERATIONS : ITERATIONS;
  78
  79        s1 = memalign(128, alloc_size);
  80        if (!s1) {
  81                perror("memalign");
  82                exit(1);
  83        }
  84
  85        s2 = memalign(128, alloc_size);
  86        if (!s2) {
  87                perror("memalign");
  88                exit(1);
  89        }
  90
  91        srandom(time(0));
  92
  93        for (i = 0; i < iterations; i++) {
  94                unsigned long j;
  95                unsigned long change;
  96                char *rand_s1 = s1;
  97                char *rand_s2 = s2;
  98
  99                for (j = 0; j < alloc_size; j++)
 100                        s1[j] = random();
 101
 102                rand_s1 += random() % MAX_OFFSET_DIFF_S1_S2;
 103                rand_s2 += random() % MAX_OFFSET_DIFF_S1_S2;
 104                memcpy(rand_s2, rand_s1, comp_size);
 105
 106                /* change one byte */
 107                change = random() % comp_size;
 108                rand_s2[change] = random() & 0xff;
 109
 110                if (islarge)
 111                        test_one(rand_s1, rand_s2, LARGE_MAX_OFFSET,
 112                                        LARGE_SIZE_START, comp_size);
 113                else
 114                        test_one(rand_s1, rand_s2, SIZE, 0, comp_size);
 115        }
 116
 117        srandom(time(0));
 118
 119        for (i = 0; i < iterations; i++) {
 120                unsigned long j;
 121                unsigned long change;
 122                char *rand_s1 = s1;
 123                char *rand_s2 = s2;
 124
 125                for (j = 0; j < alloc_size; j++)
 126                        s1[j] = random();
 127
 128                rand_s1 += random() % MAX_OFFSET_DIFF_S1_S2;
 129                rand_s2 += random() % MAX_OFFSET_DIFF_S1_S2;
 130                memcpy(rand_s2, rand_s1, comp_size);
 131
 132                /* change multiple bytes, 1/8 of total */
 133                for (j = 0; j < comp_size / 8; j++) {
 134                        change = random() % comp_size;
 135                        s2[change] = random() & 0xff;
 136                }
 137
 138                if (islarge)
 139                        test_one(rand_s1, rand_s2, LARGE_MAX_OFFSET,
 140                                        LARGE_SIZE_START, comp_size);
 141                else
 142                        test_one(rand_s1, rand_s2, SIZE, 0, comp_size);
 143        }
 144
 145        return 0;
 146}
 147
 148static int testcases(void)
 149{
 150        testcase(0);
 151        testcase(1);
 152        return 0;
 153}
 154
 155int main(void)
 156{
 157        test_harness_set_timeout(300);
 158        return test_harness(testcases, "memcmp");
 159}
 160