tools: Add stm32image tool into TF-A

This tools adds a specific header to ST TF-A binary.
This header is used by STM32MP1 ROM code to check the bootloader.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>

2 files changed, 296 insertions, 0 deletions

diff --git a/tools/stm32image/Makefile b/tools/stm32image/Makefile
new file mode 100644
index 00000000..80dfbecf
--- /dev/null
+++ b/tools/stm32image/Makefile
@@ -0,0 +1,49 @@
+#
+# Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+MAKE_HELPERS_DIRECTORY := ../../make_helpers/
+include ${MAKE_HELPERS_DIRECTORY}build_macros.mk
+include ${MAKE_HELPERS_DIRECTORY}build_env.mk
+
+PROJECT := stm32image${BIN_EXT}
+OBJECTS := stm32image.o
+V := 0
+
+override CPPFLAGS += -D_GNU_SOURCE
+CFLAGS := -Wall -Werror -pedantic -std=c99
+ifeq (${DEBUG},1)
+  CFLAGS += -g -O0 -DDEBUG
+else
+  CFLAGS += -O2
+endif
+
+ifeq (${V},0)
+  Q := @
+else
+  Q :=
+endif
+
+CC := gcc
+
+.PHONY: all clean distclean
+
+all: ${PROJECT}
+
+${PROJECT}: ${OBJECTS} Makefile
+	@echo "  LD      $@"
+	${Q}${CC} ${OBJECTS} -o $@
+	@${ECHO_BLANK_LINE}
+	@echo "Built $@ successfully"
+	@${ECHO_BLANK_LINE}
+
+%.o: %.c %.h Makefile
+	@echo "  CC      $<"
+	${Q}${CC} -c ${CFLAGS} $< -o $@
+
+clean:
+	$(call SHELL_DELETE_ALL, ${PROJECT} ${OBJECTS})
+
+distclean: clean
diff --git a/tools/stm32image/stm32image.c b/tools/stm32image/stm32image.c
new file mode 100644
index 00000000..26079284
--- /dev/null
+++ b/tools/stm32image/stm32image.c
@@ -0,0 +1,247 @@
+/*
+ * Copyright (c) 2017-2018, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm/byteorder.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/* Magic = 'S' 'T' 'M' 0x32 */
+#define HEADER_MAGIC		__be32_to_cpu(0x53544D32)
+#define VER_MAJOR		2
+#define VER_MINOR		1
+#define VER_VARIANT		0
+#define HEADER_VERSION_V1	0x1
+#define TF_BINARY_TYPE		0x0
+
+/* Default option : bit0 => no signature */
+#define HEADER_DEFAULT_OPTION	(__cpu_to_le32(0x00000001))
+
+struct stm32_header {
+	uint32_t magic_number;
+	uint8_t image_signature[64];
+	uint32_t image_checksum;
+	uint8_t  header_version[4];
+	uint32_t image_length;
+	uint32_t image_entry_point;
+	uint32_t reserved1;
+	uint32_t load_address;
+	uint32_t reserved2;
+	uint32_t version_number;
+	uint32_t option_flags;
+	uint32_t ecdsa_algorithm;
+	uint8_t ecdsa_public_key[64];
+	uint8_t padding[83];
+	uint8_t binary_type;
+};
+
+static struct stm32_header stm32image_header;
+
+static void stm32image_default_header(struct stm32_header *ptr)
+{
+	if (!ptr) {
+		return;
+	}
+
+	ptr->magic_number = HEADER_MAGIC;
+	ptr->header_version[VER_MAJOR] = HEADER_VERSION_V1;
+	ptr->option_flags = HEADER_DEFAULT_OPTION;
+	ptr->ecdsa_algorithm = 1;
+	ptr->version_number = 0;
+	ptr->binary_type = TF_BINARY_TYPE;
+}
+
+static uint32_t stm32image_checksum(void *start, uint32_t len)
+{
+	uint32_t csum = 0;
+	uint32_t hdr_len = sizeof(struct stm32_header);
+	uint8_t *p;
+
+	if (len < hdr_len) {
+		return 0;
+	}
+
+	p = (unsigned char *)start + hdr_len;
+	len -= hdr_len;
+
+	while (len > 0) {
+		csum += *p;
+		p++;
+		len--;
+	}
+
+	return csum;
+}
+
+static void stm32image_print_header(const void *ptr)
+{
+	struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
+
+	printf("Image Type   : ST Microelectronics STM32 V%d.%d\n",
+	       stm32hdr->header_version[VER_MAJOR],
+	       stm32hdr->header_version[VER_MINOR]);
+	printf("Image Size   : %lu bytes\n",
+	       (unsigned long)__le32_to_cpu(stm32hdr->image_length));
+	printf("Image Load   : 0x%08x\n",
+	       __le32_to_cpu(stm32hdr->load_address));
+	printf("Entry Point  : 0x%08x\n",
+	       __le32_to_cpu(stm32hdr->image_entry_point));
+	printf("Checksum     : 0x%08x\n",
+	       __le32_to_cpu(stm32hdr->image_checksum));
+	printf("Option     : 0x%08x\n",
+	       __le32_to_cpu(stm32hdr->option_flags));
+	printf("Version	   : 0x%08x\n",
+	       __le32_to_cpu(stm32hdr->version_number));
+}
+
+static void stm32image_set_header(void *ptr, struct stat *sbuf, int ifd,
+				  uint32_t loadaddr, uint32_t ep, uint32_t ver)
+{
+	struct stm32_header *stm32hdr = (struct stm32_header *)ptr;
+
+	stm32image_default_header(stm32hdr);
+
+	stm32hdr->load_address = __cpu_to_le32(loadaddr);
+	stm32hdr->image_entry_point = __cpu_to_le32(ep);
+	stm32hdr->image_length = __cpu_to_le32((uint32_t)sbuf->st_size -
+					     sizeof(struct stm32_header));
+	stm32hdr->image_checksum = stm32image_checksum(ptr, sbuf->st_size);
+	stm32hdr->version_number = __cpu_to_le32(ver);
+}
+
+static int stm32image_create_header_file(char *srcname, char *destname,
+					 uint32_t loadaddr, uint32_t entry,
+					 uint32_t version)
+{
+	int src_fd, dest_fd;
+	struct stat sbuf;
+	unsigned char *ptr;
+
+	dest_fd = open(destname, O_RDWR | O_CREAT | O_TRUNC | O_APPEND, 0666);
+	if (dest_fd == -1) {
+		fprintf(stderr, "Can't open %s: %s\n", destname,
+			strerror(errno));
+		return -1;
+	}
+
+	src_fd = open(srcname, O_RDONLY);
+	if (src_fd == -1) {
+		fprintf(stderr, "Can't open %s: %s\n", srcname,
+			strerror(errno));
+		return -1;
+	}
+
+	if (fstat(src_fd, &sbuf) < 0) {
+		return -1;
+	}
+
+	ptr = mmap(NULL, sbuf.st_size, PROT_READ, MAP_SHARED, src_fd, 0);
+	if (ptr == MAP_FAILED) {
+		fprintf(stderr, "Can't read %s\n", srcname);
+		return -1;
+	}
+
+	memset(&stm32image_header, 0, sizeof(struct stm32_header));
+
+	if (write(dest_fd, &stm32image_header, sizeof(struct stm32_header)) !=
+	    sizeof(struct stm32_header)) {
+		fprintf(stderr, "Write error %s: %s\n", destname,
+			strerror(errno));
+		return -1;
+	}
+
+	if (write(dest_fd, ptr, sbuf.st_size) != sbuf.st_size) {
+		fprintf(stderr, "Write error on %s: %s\n", destname,
+			strerror(errno));
+		return -1;
+	}
+
+	munmap((void *)ptr, sbuf.st_size);
+	close(src_fd);
+
+	if (fstat(dest_fd, &sbuf) < 0) {
+		return -1;
+	}
+
+	ptr = mmap(0, sbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED,
+		   dest_fd, 0);
+
+	if (ptr == MAP_FAILED) {
+		fprintf(stderr, "Can't read %s\n", srcname);
+		return -1;
+	}
+
+	stm32image_set_header(ptr, &sbuf, dest_fd, loadaddr, entry, version);
+
+	stm32image_print_header(ptr);
+
+	munmap((void *)ptr, sbuf.st_size);
+	close(dest_fd);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	int opt, loadaddr = -1, entry = -1, err = 0, version = 0;
+	char *dest = NULL, *src = NULL;
+
+	while ((opt = getopt(argc, argv, ":s:d:l:e:v:")) != -1) {
+		switch (opt) {
+		case 's':
+			src = optarg;
+			break;
+		case 'd':
+			dest = optarg;
+			break;
+		case 'l':
+			loadaddr = strtol(optarg, NULL, 16);
+			break;
+		case 'e':
+			entry = strtol(optarg, NULL, 16);
+			break;
+		case 'v':
+			version = strtol(optarg, NULL, 10);
+			break;
+		default:
+			fprintf(stderr,
+				"Usage : %s [-s srcfile] [-d destfile] [-l loadaddr] [-e entry_point]\n",
+					argv[0]);
+			return -1;
+		}
+	}
+
+	if (!src) {
+		fprintf(stderr, "Missing -s option\n");
+		return -1;
+	}
+
+	if (!dest) {
+		fprintf(stderr, "Missing -d option\n");
+		return -1;
+	}
+
+	if (loadaddr == -1) {
+		fprintf(stderr, "Missing -l option\n");
+		return -1;
+	}
+
+	if (entry == -1) {
+		fprintf(stderr, "Missing -e option\n");
+		return -1;
+	}
+
+	err = stm32image_create_header_file(src, dest, loadaddr,
+					    entry, version);
+
+	return err;
+}