[PATCH 12/18] ihex: add ihex2fw tool for converting HEX files into firmware images

From: David Woodhouse
Date: Thu Jun 05 2008 - 05:57:24 EST


Not the straight conversion to binary which objcopy can do for us, but
actually representing each record with its original {addr, length},
because some drivers need that information preserved.

Fix up 'firmware_install' to be able to build $(hostprogs-y) too.

Signed-off-by: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
---
firmware/Makefile | 14 +++
firmware/ihex2fw.c | 238 +++++++++++++++++++++++++++++++++++++++++++++++
scripts/Makefile.fwinst | 7 +-
3 files changed, 258 insertions(+), 1 deletions(-)
create mode 100644 firmware/ihex2fw.c

diff --git a/firmware/Makefile b/firmware/Makefile
index 4e19ac1..2583aef 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -28,6 +28,9 @@ quiet_cmd_mkdir = MKDIR $(patsubst $(objtree)/%,%,$@)
quiet_cmd_ihex = IHEX $@
cmd_ihex = $(OBJCOPY) -Iihex -Obinary $< $@

+quiet_cmd_ihex2fw = IHEX2FW $@
+ cmd_ihex2fw = $(objtree)/$(obj)/ihex2fw $< $@
+
quiet_cmd_fwbin = MK_FW $@
cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \
FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
@@ -80,9 +83,18 @@ $(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
$(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: %
$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%

+# .ihex is used just as a simple way to hold binary files in a source tree
+# where binaries are frowned upon. They are directly converted with objcopy.
$(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %)
$(call cmd,ihex)

+# .HEX is also Intel HEX, but where the offset and length in each record
+# is actually meaninful, because the firmware has to be loaded in a certain
+# order rather than as a single binary blob. Thus, we convert them into our
+# more compact binary representation of ihex records (<linux/ihex.h>)
+$(obj)/%.fw: $(obj)/%.HEX $(obj)/ihex2fw | $(objtree)/$(obj)/$$(dir %)
+ $(call cmd,ihex2fw)
+
$(firmware-dirs):
$(call cmd,mkdir)

@@ -96,3 +108,5 @@ targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \
# Without this, built-in.o won't be created when it's empty, and the
# final vmlinux link will fail.
obj-n := dummy
+
+hostprogs-y := ihex2fw
diff --git a/firmware/ihex2fw.c b/firmware/ihex2fw.c
new file mode 100644
index 0000000..31d963c
--- /dev/null
+++ b/firmware/ihex2fw.c
@@ -0,0 +1,238 @@
+/*
+ * Parser/loader for IHEX formatted data.
+ *
+ * Copyright © 2008 David Woodhouse <dwmw2@xxxxxxxxxxxxx>
+ * Copyright © 2005 Jan Harkes <jaharkes@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <stdint.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+struct ihex_binrec {
+ struct ihex_binrec *next; /* not part of the real data structure */
+ uint32_t addr;
+ uint8_t len;
+ uint8_t data[256];
+};
+
+/**
+ * nybble/hex are little helpers to parse hexadecimal numbers to a byte value
+ **/
+static uint8_t nybble(const uint8_t n)
+{
+ if (n >= '0' && n <= '9') return n - '0';
+ else if (n >= 'A' && n <= 'F') return n - ('A' - 10);
+ else if (n >= 'a' && n <= 'f') return n - ('a' - 10);
+ return 0;
+}
+
+static uint8_t hex(const uint8_t *data, uint8_t *crc)
+{
+ uint8_t val = (nybble(data[0]) << 4) | nybble(data[1]);
+ *crc += val;
+ return val;
+}
+
+static int process_ihex(uint8_t *data, ssize_t size);
+static void file_record(struct ihex_binrec *record);
+static int output_records(int outfd);
+
+static int sort_records = 0;
+
+int main(int argc, char **argv)
+{
+ int infd, outfd;
+ struct stat st;
+ uint8_t *data;
+
+ if (argc == 4 && !strcmp(argv[1], "-s")) {
+ sort_records = 1;
+ argc--;
+ argv++;
+ }
+ if (argc != 3) {
+ usage:
+ fprintf(stderr, "ihex2fw: Convert ihex files into binary "
+ "representation for use by Linux kernel\n");
+ fprintf(stderr, "usage: ihex2fw [-s] <src.HEX> <dst.fw>\n");
+ fprintf(stderr, " -s: sort records by address\n");
+ return 1;
+ }
+ if (!strcmp(argv[1], "-"))
+ infd = 0;
+ else
+ infd = open(argv[1], O_RDONLY);
+ if (infd == -1) {
+ fprintf(stderr, "Failed to open source file: %s",
+ strerror(errno));
+ goto usage;
+ }
+ if (fstat(infd, &st)) {
+ perror("stat");
+ return 1;
+ }
+ data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, infd, 0);
+ if (data == MAP_FAILED) {
+ perror("mmap");
+ return 1;
+ }
+
+ if (!strcmp(argv[2], "-"))
+ outfd = 1;
+ else
+ outfd = open(argv[2], O_TRUNC|O_CREAT|O_WRONLY, 0644);
+ if (outfd == -1) {
+ fprintf(stderr, "Failed to open destination file: %s",
+ strerror(errno));
+ goto usage;
+ }
+ if (process_ihex(data, st.st_size))
+ return 1;
+
+ output_records(outfd);
+ return 0;
+}
+
+static int process_ihex(uint8_t *data, ssize_t size)
+{
+ struct ihex_binrec *record;
+ uint32_t offset = 0;
+ uint8_t type, crc = 0;
+ int i, j;
+ int line = 1;
+
+ i = 0;
+next_record:
+ record = malloc(sizeof(*record));
+ if (!record) {
+ fprintf(stderr, "out of memory for records\n");
+ return -ENOMEM;
+ }
+ memset(record, 0, sizeof(*record));
+
+ /* search for the start of record character */
+ while (i < size) {
+ if (data[i] == '\n') line++;
+ if (data[i++] == ':') break;
+ }
+
+ /* Minimum record length would be about 10 characters */
+ if (i + 10 > size) {
+ fprintf(stderr, "Can't find valid record\n");
+ return -EINVAL;
+ }
+
+ record->len = hex(data + i, &crc);
+ i += 2;
+
+ /* now check if we have enough data to read everything */
+ if (i + 8 + (record->len * 2) > size) {
+ fprintf(stderr, "Not enough data to read complete record\n");
+ return -EINVAL;
+ }
+
+ record->addr = hex(data + i, &crc) << 8; i += 2;
+ record->addr |= hex(data + i, &crc); i += 2;
+ record->addr += offset;
+ type = hex(data + i, &crc); i += 2;
+
+ for (j = 0; j < record->len; j++, i += 2)
+ record->data[j] = hex(data + i, &crc);
+
+ /* check CRC */
+ (void)hex(data + i, &crc); i += 2;
+ if (crc != 0) {
+ fprintf(stderr, "CRC failure\n");
+ return -EINVAL;
+ }
+
+ /* Done reading the record */
+ switch (type) {
+ case 0:
+ /* old style EOF record? */
+ if (!record->len)
+ break;
+
+ file_record(record);
+ goto next_record;
+
+ case 1: /* End-Of-File Record */
+ if (record->addr || record->len) {
+ fprintf(stderr, "Bad EOF record (type 01) format\n");
+ return -EINVAL;
+ }
+ break;
+
+ case 2: /* Extended Segment Address Record (HEX86) */
+ case 4: /* Extended Linear Address Record (HEX386) */
+ if (record->addr || record->len != 2) {
+ fprintf(stderr, "Bad HEX86/HEX386 record (type %02X)\n", type);
+ return -EINVAL;
+ }
+
+ /* We shouldn't really be using the offset for HEX86 because
+ * the wraparound case is specified quite differently. */
+ offset = record->data[0] << 8 | record->data[1];
+ offset <<= (type == 2 ? 4 : 16);
+ goto next_record;
+
+ case 3: /* Start Segment Address Record */
+ case 5: /* Start Linear Address Record */
+ if (record->addr || record->len != 4) {
+ fprintf(stderr, "Bad Start Address record (type %02X)\n", type);
+ return -EINVAL;
+ }
+
+ /* These records contain the CS/IP or EIP where execution
+ * starts. Don't really know what to do with them. */
+ goto next_record;
+
+ default:
+ fprintf(stderr, "Unknown record (type %02X)\n", type);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct ihex_binrec *records;
+
+static void file_record(struct ihex_binrec *record)
+{
+ struct ihex_binrec **p = &records;
+
+ while ((*p) && (!sort_records || (*p)->addr < record->addr))
+ p = &((*p)->next);
+
+ record->next = *p;
+ *p = record;
+}
+
+static int output_records(int outfd)
+{
+ unsigned char zeroes[5] = {0, 0, 0, 0, 0};
+ struct ihex_binrec *p = records;
+
+ while (p) {
+ p->addr = htonl(p->addr);
+ write(outfd, &p->addr, (p->len + 8) & ~3);
+ p = p->next;
+ }
+ /* EOF record is zero length, since we don't bother to represent
+ the type field in the binary version */
+ write(outfd, zeroes, 5);
+ return 0;
+}
diff --git a/scripts/Makefile.fwinst b/scripts/Makefile.fwinst
index 3cf3649..f72355e 100644
--- a/scripts/Makefile.fwinst
+++ b/scripts/Makefile.fwinst
@@ -6,10 +6,13 @@
# ==========================================================================

INSTALL := install
+src := $(obj)

include scripts/Kbuild.include
include $(srctree)/$(obj)/Makefile

+include scripts/Makefile.host
+
installed-fw := $(addprefix $(INSTALL_FW_PATH)/,$(fw-shipped-))
installed-fw-dirs := $(sort $(dir $(installed-fw)))

@@ -22,5 +25,7 @@ $(installed-fw-dirs):
$(installed-fw): $(INSTALL_FW_PATH)/%: $(obj)/% | $(INSTALL_FW_PATH)/$$(dir %)/
$(call cmd,install)

-.PHONY: __fw_install
+.PHONY: __fw_install FORCE
__fw_install: $(installed-fw)
+
+FORCE:
--
1.5.4.5

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