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micropython/ports/stm32/mboot/fsload.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019-2020 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/mphal.h"
#include "lib/uzlib/uzlib.h"
#include "mboot.h"
#include "pack.h"
#include "vfs.h"
// Default block size used for mount operations if none given.
#ifndef MBOOT_FSLOAD_DEFAULT_BLOCK_SIZE
#define MBOOT_FSLOAD_DEFAULT_BLOCK_SIZE (4096)
#endif
#if MBOOT_FSLOAD
#if !(MBOOT_VFS_FAT || MBOOT_VFS_LFS1 || MBOOT_VFS_LFS2)
#error Must enable at least one VFS component
#endif
#if MBOOT_ENABLE_PACKING
// Packed DFU files are gzip'd internally, not on the outside, so reads of the file
// just read the file directly.
static void *input_stream_data;
static stream_read_t input_stream_read_meth;
static inline int input_stream_init(void *stream_data, stream_read_t stream_read) {
input_stream_data = stream_data;
input_stream_read_meth = stream_read;
return 0;
}
static inline int input_stream_read(size_t len, uint8_t *buf) {
return input_stream_read_meth(input_stream_data, buf, len);
}
#else
// Standard (non-packed) DFU files must be gzip'd externally / on the outside, so
// reads of the file go through gz_stream.
static inline int input_stream_init(void *stream_data, stream_read_t stream_read) {
return gz_stream_init_from_stream(stream_data, stream_read);
}
static inline int input_stream_read(size_t len, uint8_t *buf) {
return gz_stream_read(len, buf);
}
#endif
static int fsload_program_file(bool write_to_flash) {
// Parse DFU
uint32_t crc = 0xffffffff;
uint8_t buf[512];
size_t file_offset;
// Read file header, <5sBIB
int res = input_stream_read(11, buf);
if (res != 11) {
return -MBOOT_ERRNO_DFU_READ_ERROR;
}
file_offset = 11;
crc = uzlib_crc32(buf, 11, crc);
// Validate header, version 1
if (memcmp(buf, "DfuSe\x01", 6) != 0) {
return -MBOOT_ERRNO_DFU_INVALID_HEADER;
}
// Must have only 1 target
if (buf[10] != 1) {
return -MBOOT_ERRNO_DFU_TOO_MANY_TARGETS;
}
// Get total size
uint32_t total_size = get_le32(buf + 6);
// Read target header, <6sBi255sII
res = input_stream_read(274, buf);
if (res != 274) {
return -MBOOT_ERRNO_DFU_READ_ERROR;
}
file_offset += 274;
crc = uzlib_crc32(buf, 274, crc);
// Validate target header, with alt being 0
if (memcmp(buf, "Target\x00", 7) != 0) {
return -MBOOT_ERRNO_DFU_INVALID_TARGET;
}
// Get target size and number of elements
uint32_t target_size = get_le32(buf + 266);
uint32_t num_elems = get_le32(buf + 270);
size_t file_offset_target = file_offset;
size_t bytes_processed = 0;
// Parse each element
for (size_t elem = 0; elem < num_elems; ++elem) {
// Read element header, <II
res = input_stream_read(8, buf);
if (res != 8) {
return -MBOOT_ERRNO_DFU_READ_ERROR;
}
file_offset += 8;
crc = uzlib_crc32(buf, 8, crc);
// Get element destination address and size
uint32_t elem_addr = get_le32(buf);
uint32_t elem_size = get_le32(buf + 4);
#if !MBOOT_ENABLE_PACKING
// Erase flash before writing
if (write_to_flash) {
uint32_t addr = elem_addr;
while (addr < elem_addr + elem_size) {
res = do_page_erase(addr, &addr);
if (res != 0) {
return res;
}
}
}
#endif
// Read element data and possibly write to flash
for (uint32_t s = elem_size; s;) {
uint32_t l = s;
if (l > sizeof(buf)) {
l = sizeof(buf);
}
res = input_stream_read(l, buf);
if (res != l) {
return -MBOOT_ERRNO_DFU_READ_ERROR;
}
crc = uzlib_crc32(buf, l, crc);
res = do_write(elem_addr, buf, l, !write_to_flash);
if (res != 0) {
return res;
}
elem_addr += l;
s -= l;
bytes_processed += l;
mboot_state_change(MBOOT_STATE_FSLOAD_PROGRESS, write_to_flash << 31 | bytes_processed);
}
file_offset += elem_size;
}
if (target_size != file_offset - file_offset_target) {
return -MBOOT_ERRNO_DFU_INVALID_SIZE;
}
if (total_size != file_offset) {
return -MBOOT_ERRNO_DFU_INVALID_SIZE;
}
// Read trailing info
res = input_stream_read(16, buf);
if (res != 16) {
return -MBOOT_ERRNO_DFU_READ_ERROR;
}
// The final 4 bytes of the file are the expected CRC32, so including these
// bytes in the CRC calculation should yield a final CRC32 of 0.
crc = uzlib_crc32(buf, 16, crc);
if (crc != 0) {
return -MBOOT_ERRNO_DFU_INVALID_CRC;
}
return 0;
}
static int fsload_validate_and_program_file(void *stream, const stream_methods_t *meth, const char *fname) {
// First pass verifies the file, second pass programs it
for (unsigned int pass = 0; pass <= 1; ++pass) {
mboot_state_change(MBOOT_STATE_FSLOAD_PASS_START, pass);
int res = meth->open(stream, fname);
if (res == 0) {
res = input_stream_init(stream, meth->read);
if (res == 0) {
res = fsload_program_file(pass == 0 ? false : true);
}
}
meth->close(stream);
if (res != 0) {
return res;
}
}
return 0;
}
int fsload_process(void) {
const uint8_t *elem = elem_search(ELEM_DATA_START, ELEM_TYPE_FSLOAD);
if (elem == NULL || elem[-1] < 2) {
return -MBOOT_ERRNO_FSLOAD_NO_FSLOAD;
}
// Get mount point id and create null-terminated filename
uint8_t mount_point = elem[0];
uint8_t fname_len = elem[-1] - 1;
char fname[256];
memcpy(fname, &elem[1], fname_len);
fname[fname_len] = '\0';
elem = ELEM_DATA_START;
for (;;) {
elem = elem_search(elem, ELEM_TYPE_MOUNT);
if (elem == NULL) {
// End of elements.
return -MBOOT_ERRNO_FSLOAD_NO_MOUNT;
}
mboot_addr_t base_addr;
mboot_addr_t byte_len;
uint32_t block_size = MBOOT_FSLOAD_DEFAULT_BLOCK_SIZE;
if (elem[-1] == 10 || elem[-1] == 14) {
// 32-bit base and length given, extract them.
base_addr = get_le32(&elem[2]);
byte_len = get_le32(&elem[6]);
if (elem[-1] == 14) {
// Block size given, extract it.
block_size = get_le32(&elem[10]);
}
#if MBOOT_ADDRESS_SPACE_64BIT
} else if (elem[-1] == 22) {
// 64-bit base and length given, and block size, so extract them.
base_addr = get_le64(&elem[2]);
byte_len = get_le64(&elem[10]);
block_size = get_le32(&elem[18]);
#endif
} else {
// Invalid MOUNT element.
return -MBOOT_ERRNO_FSLOAD_INVALID_MOUNT;
}
if (elem[0] == mount_point) {
int ret;
union {
#if MBOOT_VFS_FAT
vfs_fat_context_t fat;
#endif
#if MBOOT_VFS_LFS1
vfs_lfs1_context_t lfs1;
#endif
#if MBOOT_VFS_LFS2
vfs_lfs2_context_t lfs2;
#endif
} ctx;
const stream_methods_t *methods;
#if MBOOT_VFS_FAT
if (elem[1] == ELEM_MOUNT_FAT) {
(void)block_size;
ret = vfs_fat_mount(&ctx.fat, base_addr, byte_len);
methods = &vfs_fat_stream_methods;
} else
#endif
#if MBOOT_VFS_LFS1
if (elem[1] == ELEM_MOUNT_LFS1) {
ret = vfs_lfs1_mount(&ctx.lfs1, base_addr, byte_len, block_size);
methods = &vfs_lfs1_stream_methods;
} else
#endif
#if MBOOT_VFS_LFS2
if (elem[1] == ELEM_MOUNT_LFS2) {
ret = vfs_lfs2_mount(&ctx.lfs2, base_addr, byte_len, block_size);
methods = &vfs_lfs2_stream_methods;
} else
#endif
{
// Unknown filesystem type
return -MBOOT_ERRNO_FSLOAD_INVALID_MOUNT;
}
if (ret == 0) {
ret = fsload_validate_and_program_file(&ctx, methods, fname);
}
return ret;
}
elem += elem[-1];
}
}
#endif // MBOOT_FSLOAD
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