Provide squashed firmware images for wcnss and modem.debian/1034.2.1-6

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

3 files changed, 184 insertions, 0 deletions

diff --git a/debian/changelog b/debian/changelog
index 274acc0..df6de98 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+linux-board-support-package-dragonboard410c (1034.2.1-6) unstable; urgency=medium
+
+  * Provide squashed firmware images for wcnss and modem.
+
+ -- Dmitry Baryshkov <dmitry.baryshkov@linaro.org>  Wed, 25 Aug 2021 10:51:49 +0300
+
 linux-board-support-package-dragonboard410c (1034.2.1-5) unstable; urgency=medium
 
   * Remove A300 and Venus firmware use firmware-nonfree (firmware-qcom-soc)
diff --git a/debian/pil-squasher.c b/debian/pil-squasher.c
new file mode 100644
index 0000000..b430343
--- /dev/null
+++ b/debian/pil-squasher.c
@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2019, Linaro Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <err.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <elf.h>
+
+static void usage(void)
+{
+	extern const char *__progname;
+
+	fprintf(stderr, "%s: <mbn output> <mdt header>\n", __progname);
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	unsigned char e_ident[EI_NIDENT];
+	unsigned int phnum;
+	size_t phoff;
+	bool is_64bit;
+	size_t offset;
+	size_t hashoffset;
+	void *segment;
+	ssize_t n;
+	char *ext;
+	int mdt;
+	int mbn;
+	int bxx;
+	int i;
+
+	if (argc != 3)
+		usage();
+
+	ext = strstr(argv[2], ".mdt");
+	if (!ext)
+		errx(1, "%s is not a mdt file\n", argv[2]);
+
+	mbn = open(argv[1], O_WRONLY | O_CREAT, 0644);
+	if (mbn < 0)
+		err(1, "failed to open %s", argv[1]);
+
+	mdt = open(argv[2], O_RDONLY);
+	if (mdt < 0)
+		err(1, "failed to open %s", argv[2]);
+
+	read(mdt, e_ident, sizeof(e_ident));
+	if (memcmp(e_ident, ELFMAG, SELFMAG))
+		errx(1, "not an ELF file %s", argv[2]);
+
+	if (e_ident[EI_CLASS] == ELFCLASS32) {
+		Elf32_Ehdr ehdr;
+		Elf32_Phdr phdr;
+
+		is_64bit = false;
+		pread(mdt, &ehdr, sizeof(ehdr), 0);
+		phoff = ehdr.e_phoff;
+		phnum = ehdr.e_phnum;
+
+		pread(mdt, &phdr, sizeof(phdr), phoff);
+		hashoffset = phdr.p_filesz;
+	} else if (e_ident[EI_CLASS] == ELFCLASS64) {
+		Elf64_Ehdr ehdr;
+		Elf64_Phdr phdr;
+
+		is_64bit = true;
+		pread(mdt, &ehdr, sizeof(ehdr), 0);
+		phoff = ehdr.e_phoff;
+		phnum = ehdr.e_phnum;
+
+		pread(mdt, &phdr, sizeof(phdr), phoff);
+		hashoffset = phdr.p_filesz;
+	} else
+		errx(1, "Unsupported ELF class %d\n", e_ident[EI_CLASS]);
+
+	for (i = 0; i < phnum; i++) {
+		size_t p_filesz, p_offset, r_offset;
+		unsigned long p_flags;
+
+		if (is_64bit) {
+			Elf64_Phdr phdr;
+
+			offset = phoff + i * sizeof(phdr);
+
+			pread(mdt, &phdr, sizeof(phdr), offset);
+			pwrite(mbn, &phdr, sizeof(phdr), offset);
+			p_offset = phdr.p_offset;
+			p_filesz = phdr.p_filesz;
+			p_flags = phdr.p_flags;
+		} else {
+			Elf32_Phdr phdr;
+			size_t offset;
+
+			offset = phoff + i * sizeof(phdr);
+
+			pread(mdt, &phdr, sizeof(phdr), offset);
+			pwrite(mbn, &phdr, sizeof(phdr), offset);
+			p_offset = phdr.p_offset;
+			p_filesz = phdr.p_filesz;
+			p_flags = phdr.p_flags;
+		}
+
+		if (!p_filesz)
+			continue;
+
+		segment = malloc(p_filesz);
+
+		/*
+		 * Attempt to read the hash chunk (type 2) directly following
+		 * the ELF header in the mdt, rather than the one stored in b01
+		 */
+		if (((p_flags >> 24) & 7) == 2) {
+			r_offset = hashoffset;
+			hashoffset += p_filesz;
+		} else {
+			r_offset = p_offset;
+		}
+
+		n = pread(mdt, segment, p_filesz, r_offset);
+		if (n < 0) {
+			errx(1, "failed to load segment %d: %zd\n", i, n);
+		} else if (n == 0) {
+			sprintf(ext, ".b%02d", i);
+
+			bxx = open(argv[2], O_RDONLY);
+			if (bxx < 0)
+				warn("failed to open %s", argv[2]);
+
+			read(bxx, segment, p_filesz);
+
+			close(bxx);
+		}
+		pwrite(mbn, segment, p_filesz, p_offset);
+
+		free(segment);
+	}
+
+	close(mdt);
+	close(mbn);
+
+	return 0;
+}
diff --git a/debian/rules b/debian/rules
index 95114b2..174dcac 100755
--- a/debian/rules
+++ b/debian/rules
@@ -12,8 +12,12 @@ override_dh_auto_build:
 	cp $(DIR_ORIG)/LICENSE debian/copyright
 	MTOOLS_SKIP_CHECK=1 mcopy -i $(DIR_ORIG)//bootloaders-linux/NON-HLOS.bin ::image/modem.* ::image/mba.mbn ::image/wcnss.* $(DIR_ORIG)/proprietary-linux
 	mv $(DIR_ORIG)/efs-seed/fs_image_linux.tar.gz.mbn.img $(DIR_ORIG)/efs-seed/modem_fsg
+	gcc -O debian/pil-squasher.c -o pil-squasher
+	./pil-squasher $(DIR_ORIG)/proprietary-linux/modem.mbn $(DIR_ORIG)/proprietary-linux/modem.mdt
+	./pil-squasher $(DIR_ORIG)/proprietary-linux/wcnss.mbn $(DIR_ORIG)/proprietary-linux/wcnss.mdt
 
 override_dh_auto_clean:
+	rm -rf pil-squasher
 	rm -rf $(DIR_ORIG)
 	rm -f debian/copyright