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mkimxboot: factor code, add support for ELF files

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Refactor code.
This tool can now either load a scrambled rockbox
firmware (in which case the model is check against the
firmware), or any ELF file. This is useful for example
for hwstub which produces a ELF file and still needs
to be loaded by producing a SB file.

Change-Id: I7aa381b3f6587788d1950793e89ce5608c53cccc
This commit is contained in:
Amaury Pouly 2013-06-16 01:33:16 +02:00
parent 7c7fa36918
commit d561017f35
3 changed files with 150 additions and 33 deletions
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2
rbutil/mkimxboot/Makefile
View file

@ -13,7 +13,7 @@ CFLAGS += -std=c99 -g -O3
OUTPUT = mkimxboot
# inputs for lib
IMXTOOLS_SOURCES = misc.c sb.c crypto.c crc.c aes128.c sha1.c
IMXTOOLS_SOURCES = misc.c sb.c crypto.c crc.c aes128.c sha1.c elf.c
LIBSOURCES := dualboot.c mkimxboot.c md5.c \
$(addprefix $(IMXTOOLS_DIR),$(IMXTOOLS_SOURCES))
# inputs for binary only

5
rbutil/mkimxboot/main.c
View file

@ -66,6 +66,11 @@ static void usage(void)
}
printf("\n");
printf("By default a dualboot image is built\n");
printf("This tools supports the following format for the boot file:\n");
printf("- rockbox scramble format\n");
printf("- elf format\n");
printf("Additional checks will be performed on rockbox scramble format to\n");
printf("ensure soundness of operation.\n");
exit(1);
}

176
rbutil/mkimxboot/mkimxboot.c
View file

@ -27,13 +27,15 @@
#include "sb.h"
#include "dualboot.h"
#include "md5.h"
#include "elf.h"
/* abstract structure to represent a Rockbox firmware. It can be a scrambled file
* or an ELF file or whatever. */
struct rb_fw_t
{
void *boot;
size_t boot_sz;
int nr_insts;
struct sb_inst_t *insts;
int entry_idx;
};
struct imx_fw_variant_desc_t
@ -167,6 +169,24 @@ static const struct imx_model_desc_t imx_models[] =
#define MAGIC_RECOVERY 0xfee1dead
#define MAGIC_NORMAL 0xcafebabe
static int rb_fw_get_sb_inst_count(struct rb_fw_t *fw)
{
return fw->nr_insts;
}
/* fill sb instruction for the firmware, fill fill rb_fw_get_sb_inst_count() instructions */
static void rb_fw_fill_sb(struct rb_fw_t *fw, struct sb_inst_t *inst,
uint32_t entry_arg)
{
memcpy(inst, fw->insts, fw->nr_insts * sizeof(struct sb_inst_t));
/* copy data if needed */
for(int i = 0; i < fw->nr_insts; i++)
if(fw->insts[i].inst == SB_INST_LOAD)
fw->insts[i].data = memdup(fw->insts[i].data, fw->insts[i].size);
/* replace call argument of the entry point */
inst[fw->entry_idx].argument = entry_arg;
}
static enum imx_error_t patch_std_zero_host_play(int jump_before, int model,
enum imx_output_type_t type, struct sb_file_t *sb_file, struct rb_fw_t boot_fw)
{
@ -189,6 +209,9 @@ static enum imx_error_t patch_std_zero_host_play(int jump_before, int model,
sb_file->override_crypto_iv = false;
sb_file->override_real_key = false;
/* used to manipulate entries */
int nr_boot_inst = rb_fw_get_sb_inst_count(&boot_fw);
/* first locate the good instruction */
struct sb_section_t *sec = &sb_file->sections[0];
int jump_idx = 0;
@ -230,19 +253,12 @@ static enum imx_error_t patch_std_zero_host_play(int jump_before, int model,
/* create a new section */
struct sb_section_t rock_sec;
memset(&rock_sec, 0, sizeof(rock_sec));
/* section has two instructions: load and call */
/* section can have any number of instructions */
rock_sec.identifier = MAGIC_ROCK;
rock_sec.alignment = BLOCK_SIZE;
rock_sec.nr_insts = 2;
rock_sec.insts = xmalloc(2 * sizeof(struct sb_inst_t));
memset(rock_sec.insts, 0, 2 * sizeof(struct sb_inst_t));
rock_sec.insts[0].inst = SB_INST_LOAD;
rock_sec.insts[0].size = boot_fw.boot_sz;
rock_sec.insts[0].data = memdup(boot_fw.boot, boot_fw.boot_sz);
rock_sec.insts[0].addr = imx_models[model].bootloader_addr;
rock_sec.insts[1].inst = SB_INST_JUMP;
rock_sec.insts[1].addr = imx_models[model].bootloader_addr;
rock_sec.insts[1].argument = MAGIC_NORMAL;
rock_sec.nr_insts = nr_boot_inst;
rock_sec.insts = xmalloc(nr_boot_inst * sizeof(struct sb_inst_t));
rb_fw_fill_sb(&boot_fw, rock_sec.insts, MAGIC_NORMAL);
sb_file->sections = augment_array(sb_file->sections,
sizeof(struct sb_section_t), sb_file->nr_sections,
@ -254,23 +270,16 @@ static enum imx_error_t patch_std_zero_host_play(int jump_before, int model,
else if(type == IMX_SINGLEBOOT || type == IMX_RECOVERY)
{
bool recovery = type == IMX_RECOVERY;
/* remove everything after the call and add two instructions: load and call */
struct sb_inst_t *new_insts = xmalloc(sizeof(struct sb_inst_t) * (jump_idx + 2));
/* remove everything after the call and add instructions for firmware */
struct sb_inst_t *new_insts = xmalloc(sizeof(struct sb_inst_t) * (jump_idx + nr_boot_inst));
memcpy(new_insts, sec->insts, sizeof(struct sb_inst_t) * jump_idx);
for(int i = jump_idx; i < sec->nr_insts; i++)
sb_free_instruction(sec->insts[i]);
memset(new_insts + jump_idx, 0, 2 * sizeof(struct sb_inst_t));
new_insts[jump_idx + 0].inst = SB_INST_LOAD;
new_insts[jump_idx + 0].size = boot_fw.boot_sz;
new_insts[jump_idx + 0].data = memdup(boot_fw.boot, boot_fw.boot_sz);
new_insts[jump_idx + 0].addr = imx_models[model].bootloader_addr;
new_insts[jump_idx + 1].inst = SB_INST_JUMP;
new_insts[jump_idx + 1].addr = imx_models[model].bootloader_addr;
new_insts[jump_idx + 1].argument = recovery ? MAGIC_RECOVERY : MAGIC_NORMAL;
rb_fw_fill_sb(&boot_fw, &new_insts[jump_idx], recovery ? MAGIC_RECOVERY : MAGIC_NORMAL);
free(sec->insts);
sec->insts = new_insts;
sec->nr_insts = jump_idx + 2;
sec->nr_insts = jump_idx + nr_boot_inst;
/* remove all other sections */
for(int i = 1; i < sb_file->nr_sections; i++)
sb_free_section(sb_file->sections[i]);
@ -558,9 +567,10 @@ static enum imx_error_t load_sb_file(const char *file, int md5_idx,
return IMX_SUCCESS;
}
/* Load a rockbox firwmare from a buffer. Data is copied. */
static enum imx_error_t rb_fw_load_buf(struct rb_fw_t *fw, uint8_t *buf, size_t sz,
enum imx_model_t model)
/* Load a rockbox firwmare from a buffer. Data is copied. Assume firmware is
* using our scramble format. */
static enum imx_error_t rb_fw_load_buf_scramble(struct rb_fw_t *fw, uint8_t *buf,
size_t sz, enum imx_model_t model)
{
if(sz < 8)
{
@ -583,11 +593,112 @@ static enum imx_error_t rb_fw_load_buf(struct rb_fw_t *fw, uint8_t *buf, size_t
printf("[ERR] Bootloader checksum mismatch\n");
return IMX_BOOT_CHECKSUM_ERROR;
}
fw->boot = memdup(buf + 8, sz - 8);
fw->boot_sz = sz - 8;
/* two instructions: load and jump */
fw->nr_insts = 2;
fw->entry_idx = 1;
fw->insts = xmalloc(fw->nr_insts * sizeof(struct sb_inst_t));
memset(fw->insts, 0, fw->nr_insts * sizeof(struct sb_inst_t));
fw->insts[0].inst = SB_INST_LOAD;
fw->insts[0].addr = imx_models[model].bootloader_addr;
fw->insts[0].size = sz - 8;
fw->insts[0].data = memdup(buf + 8, sz - 8);
fw->insts[1].inst = SB_INST_JUMP;
fw->insts[1].addr = imx_models[model].bootloader_addr;
return IMX_SUCCESS;
}
struct elf_user_t
{
void *buf;
size_t sz;
};
static bool elf_read(void *user, uint32_t addr, void *buf, size_t count)
{
struct elf_user_t *u = user;
if(addr + count <= u->sz)
{
memcpy(buf, u->buf + addr, count);
return true;
}
else
return false;
}
static void elf_printf(void *user, bool error, const char *fmt, ...)
{
if(!g_debug && !error)
return;
(void) user;
va_list args;
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
}
/* Load a rockbox firwmare from a buffer. Data is copied. Assume firmware is
* using ELF format. */
static enum imx_error_t rb_fw_load_buf_elf(struct rb_fw_t *fw, uint8_t *buf,
size_t sz, enum imx_model_t model)
{
struct elf_params_t elf;
struct elf_user_t user;
user.buf = buf;
user.sz = sz;
elf_init(&elf);
if(!elf_read_file(&elf, &elf_read, &elf_printf, &user))
{
elf_release(&elf);
printf("[ERR] Error parsing ELF file\n");
return IMX_BOOT_INVALID;
}
elf_translate_addresses(&elf);
fw->nr_insts = elf_get_nr_sections(&elf) + 1;
fw->insts = xmalloc(fw->nr_insts * sizeof(struct sb_inst_t));
fw->entry_idx = fw->nr_insts - 1;
memset(fw->insts, 0, fw->nr_insts * sizeof(struct sb_inst_t));
struct elf_section_t *sec = elf.first_section;
for(int i = 0; sec; i++, sec = sec->next)
{
fw->insts[i].addr = sec->addr;
fw->insts[i].size = sec->size;
if(sec->type == EST_LOAD)
{
fw->insts[i].inst = SB_INST_LOAD;
fw->insts[i].data = memdup(sec->section, sec->size);
}
else if(sec->type == EST_FILL)
{
fw->insts[i].inst = SB_INST_FILL;
fw->insts[i].pattern = sec->pattern;
}
else
{
printf("[WARN] Warning parsing ELF file: unsupported section type mapped to NOP!\n");
fw->insts[i].inst = SB_INST_NOP;
}
}
fw->insts[fw->nr_insts - 1].inst = SB_INST_JUMP;
if(!elf_get_start_addr(&elf, &fw->insts[fw->nr_insts - 1].addr))
{
elf_release(&elf);
printf("[ERROR] Error parsing ELF file: it has no entry point!\n");
return IMX_BOOT_INVALID;
}
elf_release(&elf);
return IMX_SUCCESS;
}
/* Load a rockbox firwmare from a buffer. Data is copied. */
static enum imx_error_t rb_fw_load_buf(struct rb_fw_t *fw, uint8_t *buf,
size_t sz, enum imx_model_t model)
{
/* detect file format */
if(sz >= 4 && buf[0] == 0x7f && memcmp(buf + 1, "ELF", 3) == 0)
return rb_fw_load_buf_elf(fw, buf, sz, model);
else
return rb_fw_load_buf_scramble(fw, buf, sz, model);
}
/* load a rockbox firmware from a file. */
static enum imx_error_t rb_fw_load(struct rb_fw_t *fw, const char *file,
enum imx_model_t model)
@ -606,9 +717,10 @@ static enum imx_error_t rb_fw_load(struct rb_fw_t *fw, const char *file,
/* free rockbox firmware */
static void rb_fw_free(struct rb_fw_t *fw)
{
free(fw->boot);
fw->boot = NULL;
fw->boot_sz = 0;
for(int i = 0; i < fw->nr_insts; i++)
sb_free_instruction(fw->insts[i]);
free(fw->insts);
memset(fw, 0, sizeof(struct rb_fw_t));
}
enum imx_error_t mkimxboot(const char *infile, const char *bootfile,