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use less stack memory in storage_commit

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This commit is contained in:
Jochen Hoenicke 2016-04-27 19:23:02 +02:00
parent da98a3a6fd
commit 630e26dd20
1 changed files with 25 additions and 11 deletions
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36
firmware/storage.c
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@ -69,6 +69,8 @@ erasing the flash.
#define FLASH_STORAGE_PINAREA_LEN (0x1000)
#define FLASH_STORAGE_REALLEN (4 + sizeof(storage_uuid) + sizeof(Storage))
_Static_assert(FLASH_STORAGE_START + FLASH_STORAGE_REALLEN <= FLASH_STORAGE_PINAREA, "Storage struct is too large for TREZOR flash");
_Static_assert((sizeof(storage_uuid) & 3) == 0, "storage uuid unaligned");
_Static_assert((sizeof(storage) & 3) == 0, "storage unaligned");
static bool sessionSeedCached;
@ -166,26 +168,38 @@ void session_clear(bool clear_pin)
}
}
static uint32_t storage_flash_words(uint32_t addr, uint32_t *src, int nwords) {
int i;
for (i = 0; i < nwords; i++) {
flash_program_word(addr, *src++);
addr += 4;
}
return addr;
}
void storage_commit(void)
{
int i;
uint32_t meta_backup[(FLASH_STORAGE_PINAREA - FLASH_META_START) / 4];
uint8_t meta_backup[FLASH_META_DESC_LEN];
// backup meta
memcpy((uint8_t*)meta_backup, (uint8_t*)FLASH_META_START, FLASH_META_DESC_LEN);
// modify storage
memcpy((uint8_t*)meta_backup + FLASH_META_DESC_LEN, "stor", 4);
memcpy((uint8_t*)meta_backup + FLASH_META_DESC_LEN + 4, storage_uuid, sizeof(storage_uuid));
memcpy((uint8_t*)meta_backup + FLASH_META_DESC_LEN + 4 + sizeof(storage_uuid), &storage, sizeof(Storage));
memset((uint8_t*)meta_backup + FLASH_META_DESC_LEN + FLASH_STORAGE_REALLEN, 0, sizeof(meta_backup) - FLASH_META_DESC_LEN - FLASH_STORAGE_REALLEN);
memcpy(meta_backup, (uint8_t*)FLASH_META_START, FLASH_META_DESC_LEN);
flash_clear_status_flags();
flash_unlock();
// erase storage
flash_erase_sector(FLASH_META_SECTOR_FIRST, FLASH_CR_PROGRAM_X32);
// copy it back
for (i = 0; i < (signed) (sizeof(meta_backup) / 4); i++) {
flash_program_word(FLASH_META_START + i * 4, meta_backup[i]);
// copy meta
uint32_t flash = FLASH_META_START;
flash = storage_flash_words(flash, (uint32_t *)meta_backup, FLASH_META_DESC_LEN/4);
// copy storage
flash_program_word(flash, *(uint32_t *) "stor");
flash += 4;
flash = storage_flash_words(flash, (uint32_t *)&storage_uuid, sizeof(storage_uuid)/4);
flash = storage_flash_words(flash, (uint32_t *)&storage, sizeof(storage)/4);
// fill remainder with zero for future extensions
while (flash < FLASH_STORAGE_PINAREA) {
flash_program_word(flash, 0);
flash += 4;
}
flash_lock();
storage_check_flash_errors();