selftests/powerpc: Add test of memcmp at end of page (8ac9b9d6) · Commits · 戴 / test

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

+22 −18

Original line number	Diff line number	Diff line
		@@ -2,6 +2,7 @@
		#include <malloc.h>
		#include <stdlib.h>
		#include <string.h>
		#include <sys/mman.h>
		#include <time.h>
		#include "utils.h"

		@@ -13,6 +14,9 @@
		#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;
		@@ -68,25 +72,25 @@ static void test_one(char s1, char s2, unsigned long max_offset,

		static int testcase(bool islarge)
		{
		char *s1;
		char *s2;
		unsigned long i;
		unsigned long i, comp_size, alloc_size;
		char p, s1, *s2;
		int iterations;

		unsigned long comp_size = (islarge ? LARGE_SIZE : SIZE);
		unsigned long alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2;
		int iterations = islarge ? LARGE_ITERATIONS : ITERATIONS;
		comp_size = (islarge ? LARGE_SIZE : SIZE);
		alloc_size = comp_size + MAX_OFFSET_DIFF_S1_S2;
		iterations = islarge ? LARGE_ITERATIONS : ITERATIONS;

		s1 = memalign(128, alloc_size);
		if (!s1) {
		perror("memalign");
		exit(1);
		}
		p = mmap(NULL, 4 * MAP_SIZE, PROT_READ \| PROT_WRITE,
		MAP_ANONYMOUS \| MAP_PRIVATE, -1, 0);
		FAIL_IF(p == MAP_FAILED);

		s2 = memalign(128, alloc_size);
		if (!s2) {
		perror("memalign");
		exit(1);
		}
		/* 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));