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Bootloader: cleanse system if tainted (#554)

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* Bootloader: cleanse system if tainted
* Bootloader: correctly set VTOR before jump to firmware
This commit is contained in:
あく 2021-07-02 04:04:37 +03:00 committed by GitHub
parent 5d14dce013
commit 6c9be3755c
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
4 changed files with 24 additions and 6 deletions
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11
bootloader/targets/f5/target.c
View file

@ -15,6 +15,7 @@
// Boot request enum
#define BOOT_REQUEST_NONE 0x00000000
#define BOOT_REQUEST_DFU 0xDF00B000
#define BOOT_REQUEST_TAINTED 0xDF00F000
// Boot to DFU pin
#define BOOT_DFU_PORT GPIOB
#define BOOT_DFU_PIN LL_GPIO_PIN_11
@ -136,8 +137,12 @@ void target_init() {
int target_is_dfu_requested() {
if(LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR0) == BOOT_REQUEST_DFU) {
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
return 1;
} else if(LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR0) == BOOT_REQUEST_TAINTED) {
// We came here directly from STM bootloader and chip is unusable
// One more reset required to fix it
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
NVIC_SystemReset();
}
LL_mDelay(100);
if(!LL_GPIO_IsInputPinSet(BOOT_DFU_PORT, BOOT_DFU_PIN)) {
@ -159,6 +164,8 @@ void target_switch(void* offset) {
void target_switch2dfu() {
target_led_control("B");
// Mark system as tainted, it will be soon
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_TAINTED);
// Remap memory to system bootloader
LL_SYSCFG_SetRemapMemory(LL_SYSCFG_REMAP_SYSTEMFLASH);
target_switch(0x0);
@ -166,6 +173,6 @@ void target_switch2dfu() {
void target_switch2os() {
target_led_control("G");
SCB->VTOR = BOOT_ADDRESS + OS_OFFSET;
SCB->VTOR = OS_OFFSET;
target_switch((void*)(BOOT_ADDRESS + OS_OFFSET));
}

4
bootloader/targets/f5/target.mk
View file

@ -5,7 +5,7 @@ FW_ADDRESS = 0x08008000
OS_OFFSET = 0x00008000
FLASH_ADDRESS = 0x08000000
OPENOCD_OPTS = -f interface/stlink.cfg -c "transport select hla_swd" -f ../debug/stm32wbx.cfg -c "stm32wbx.cpu configure -rtos auto" -c "init"
OPENOCD_OPTS = -f interface/stlink.cfg -c "transport select hla_swd" -f ../debug/stm32wbx.cfg -c "init"
BOOT_CFLAGS = -DBOOT_ADDRESS=$(BOOT_ADDRESS) -DFW_ADDRESS=$(FW_ADDRESS) -DOS_OFFSET=$(OS_OFFSET)
MCU_FLAGS = -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard
@ -44,3 +44,5 @@ C_SOURCES += ../lib/version/version.c
ASM_SOURCES += $(wildcard $(TARGET_DIR)/*.s)
C_SOURCES += $(wildcard $(TARGET_DIR)/*.c)
CPP_SOURCES += $(wildcard $(TARGET_DIR)/*.cpp)
SVD_FILE = ../debug/STM32WB55_CM4.svd

11
bootloader/targets/f6/target.c
View file

@ -15,6 +15,7 @@
// Boot request enum
#define BOOT_REQUEST_NONE 0x00000000
#define BOOT_REQUEST_DFU 0xDF00B000
#define BOOT_REQUEST_TAINTED 0xDF00F000
// Boot to DFU pin
#define BOOT_DFU_PORT GPIOB
#define BOOT_DFU_PIN LL_GPIO_PIN_11
@ -136,8 +137,12 @@ void target_init() {
int target_is_dfu_requested() {
if(LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR0) == BOOT_REQUEST_DFU) {
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
return 1;
} else if(LL_RTC_BAK_GetRegister(RTC, LL_RTC_BKP_DR0) == BOOT_REQUEST_TAINTED) {
// We came here directly from STM bootloader and chip is unusable
// One more reset required to fix it
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_NONE);
NVIC_SystemReset();
}
LL_mDelay(100);
if(!LL_GPIO_IsInputPinSet(BOOT_DFU_PORT, BOOT_DFU_PIN)) {
@ -159,6 +164,8 @@ void target_switch(void* offset) {
void target_switch2dfu() {
target_led_control("B");
// Mark system as tainted, it will be soon
LL_RTC_BAK_SetRegister(RTC, LL_RTC_BKP_DR0, BOOT_REQUEST_TAINTED);
// Remap memory to system bootloader
LL_SYSCFG_SetRemapMemory(LL_SYSCFG_REMAP_SYSTEMFLASH);
target_switch(0x0);
@ -166,6 +173,6 @@ void target_switch2dfu() {
void target_switch2os() {
target_led_control("G");
SCB->VTOR = BOOT_ADDRESS + OS_OFFSET;
SCB->VTOR = OS_OFFSET;
target_switch((void*)(BOOT_ADDRESS + OS_OFFSET));
}

4
bootloader/targets/f6/target.mk
View file

@ -5,7 +5,7 @@ FW_ADDRESS = 0x08008000
OS_OFFSET = 0x00008000
FLASH_ADDRESS = 0x08000000
OPENOCD_OPTS = -f interface/stlink.cfg -c "transport select hla_swd" -f ../debug/stm32wbx.cfg -c "stm32wbx.cpu configure -rtos auto" -c "init"
OPENOCD_OPTS = -f interface/stlink.cfg -c "transport select hla_swd" -f ../debug/stm32wbx.cfg -c "init"
BOOT_CFLAGS = -DBOOT_ADDRESS=$(BOOT_ADDRESS) -DFW_ADDRESS=$(FW_ADDRESS) -DOS_OFFSET=$(OS_OFFSET)
MCU_FLAGS = -mcpu=cortex-m4 -mthumb -mfpu=fpv4-sp-d16 -mfloat-abi=hard
@ -44,3 +44,5 @@ C_SOURCES += ../lib/version/version.c
ASM_SOURCES += $(wildcard $(TARGET_DIR)/*.s)
C_SOURCES += $(wildcard $(TARGET_DIR)/*.c)
CPP_SOURCES += $(wildcard $(TARGET_DIR)/*.cpp)
SVD_FILE = ../debug/STM32WB55_CM4.svd