Test "mcexec additional options (h, m, n, O, stack-premap)" on arm64

Change-Id: I85d5deb0433cc1208e4b6837dcc6d6dc2a7b7b52

test/mcexec_options/arm64/stack_premap.c

@@ -0,0 +1,102 @@
+/* stack_premap.c COPYRIGHT FUJITSU LIMITED 2018 */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#define PAGEMAP_PRESENT (1UL << 63)
+
+static void show_usage(void)
+{
+	printf("./stack_premap <stack_premap(byte)>\n");
+}
+
+int main(int argc, char *argv[])
+{
+	FILE *fp_maps = 0;
+	FILE *fp_pgmap = 0;
+	int result = -1;
+	unsigned long premap = 0;
+	unsigned long start = 0;
+	unsigned long end = 0;
+	char buf[4096];
+	char *tmp = NULL;
+	const unsigned long page_size = sysconf(_SC_PAGESIZE);
+	unsigned long align_size = 0;
+	unsigned long pagemap = 0;
+	long offset = 0;
+
+	if (argc != 2) {
+		show_usage();
+		result = 0;
+		goto err;
+	}
+	premap = atoll(argv[1]);
+
+	/* alignment check */
+	if (premap & (page_size - 1)) {
+		align_size = ((premap + page_size) & ~(page_size - 1));
+	} else {
+		align_size = premap;
+	}
+
+	fp_maps = fopen("/proc/self/maps", "r");
+	if (fp_maps == NULL) {
+		printf("fopen() failed. %d\n", errno);
+		goto err;
+	}
+
+	fp_pgmap = fopen("/proc/self/pagemap", "r");
+	if (fp_pgmap == NULL) {
+		printf("fopen() failed. %d\n", errno);
+		goto maps_close;
+	}
+
+	/* check stack area */
+	while (fgets(buf, sizeof(buf), fp_maps) != NULL) {
+		if (strstr(buf, "[stack]")) {
+			sscanf(buf, "%lx-%lx", &start, &end);
+		}
+	}
+
+	/* check premapping */
+	offset = (end - align_size) / page_size * 8;
+	if (fseek(fp_pgmap, offset, SEEK_SET)) {
+		printf("fseek() failed. %d\n", errno);
+		goto pgmap_close;
+	}
+
+	if (fread(&pagemap, 8, 1, fp_pgmap) != 1) {
+		printf("fread() failed. %d\n", errno);
+		goto pgmap_close;
+	}
+
+	if (!(pagemap & PAGEMAP_PRESENT)) {
+		printf("not premapped. (stack(0x%lx-0x%lx), va=0x%lx)\n",
+			start, end, end - align_size);
+		goto pgmap_close;
+	}
+	result = 0;
+
+pgmap_close:
+	if (fp_pgmap) {
+		if (fclose(fp_pgmap)) {
+			printf("fclose() failed. %d\n", errno);
+			result = -1;
+			goto err;
+		}
+	}
+
+maps_close:
+	if (fp_maps) {
+		if (fclose(fp_maps)) {
+			printf("fclose() failed. %d\n", errno);
+			result = -1;
+			goto err;
+		}
+	}
+
+err:
+	return result;
+}