/* read a word (16bit) from the netx to the pc */
int fn_read_data16(void *pvHandle, unsigned long ulNetxAddress, unsigned short *pusData)
{
command_context_t *cmd_ctx;
target_t *target;
int iResult;
/* cast the handle to the command context */
cmd_ctx = (command_context_t*)pvHandle;
/* get the target from the command context */
target = get_current_target(cmd_ctx);
/* read the data from the netX */
iResult = target_read_u16(target, ulNetxAddress, pusData);
if( iResult==ERROR_OK )
{
iResult = 0;
}
else
{
iResult = 1;
}
wxMilliSleep(1);
return iResult;
}
int armv7m_maybe_skip_bkpt_inst(struct target *target, bool *inst_found)
{
struct armv7m_common *armv7m = target_to_armv7m(target);
struct reg *r = armv7m->arm.pc;
bool result = false;
/* if we halted last time due to a bkpt instruction
* then we have to manually step over it, otherwise
* the core will break again */
if (target->debug_reason == DBG_REASON_BREAKPOINT) {
uint16_t op;
uint32_t pc = buf_get_u32(r->value, 0, 32);
pc &= ~1;
if (target_read_u16(target, pc, &op) == ERROR_OK) {
if ((op & 0xFF00) == 0xBE00) {
pc = buf_get_u32(r->value, 0, 32) + 2;
buf_set_u32(r->value, 0, 32, pc);
r->dirty = true;
r->valid = true;
result = true;
LOG_DEBUG("Skipping over BKPT instruction");
}
}
}
if (inst_found)
*inst_found = result;
return ERROR_OK;
}
static int str9x_protect_check(struct flash_bank *bank)
{
int retval;
struct str9x_flash_bank *str9x_info = bank->driver_priv;
struct target *target = bank->target;
int i;
uint32_t adr;
uint32_t status = 0;
uint16_t hstatus = 0;
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* read level one protection */
if (str9x_info->variant) {
if (str9x_info->bank1) {
adr = bank1start + 0x18;
retval = target_write_u16(target, adr, 0x90);
if (retval != ERROR_OK)
return retval;
retval = target_read_u16(target, adr, &hstatus);
if (retval != ERROR_OK)
return retval;
status = hstatus;
} else {
adr = bank1start + 0x14;
retval = target_write_u16(target, adr, 0x90);
if (retval != ERROR_OK)
return retval;
retval = target_read_u32(target, adr, &status);
if (retval != ERROR_OK)
return retval;
}
} else {
adr = bank1start + 0x10;
retval = target_write_u16(target, adr, 0x90);
if (retval != ERROR_OK)
return retval;
retval = target_read_u16(target, adr, &hstatus);
if (retval != ERROR_OK)
return retval;
status = hstatus;
}
/* read array command */
retval = target_write_u16(target, adr, 0xFF);
if (retval != ERROR_OK)
return retval;
for (i = 0; i < bank->num_sectors; i++) {
if (status & str9x_info->sector_bits[i])
bank->sectors[i].is_protected = 1;
else
bank->sectors[i].is_protected = 0;
}
return ERROR_OK;
}
static int stm32x_probe(struct flash_bank *bank)
{
struct target *target = bank->target;
struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
int i;
uint16_t num_pages;
uint32_t device_id;
int page_size;
uint32_t base_address = 0x08000000;
stm32x_info->probed = 0;
stm32x_info->register_offset = FLASH_OFFSET_B0;
/* read stm32 device id register */
int retval = target_read_u32(target, 0xE0042000, &device_id);
if (retval != ERROR_OK)
return retval;
LOG_INFO("device id = 0x%08" PRIx32 "", device_id);
/* get flash size from target. */
retval = target_read_u16(target, 0x1FFFF7E0, &num_pages);
if (retval != ERROR_OK)
{
LOG_WARNING("failed reading flash size, default to max target family");
/* failed reading flash size, default to max target family */
num_pages = 0xffff;
}
if ((device_id & 0x7ff) == 0x410)
{
/* medium density - we have 1k pages
* 4 pages for a protection area */
page_size = 1024;
stm32x_info->ppage_size = 4;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revA */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 128k flash");
num_pages = 128;
}
}
else if ((device_id & 0x7ff) == 0x412)
{
/* low density - we have 1k pages
* 4 pages for a protection area */
page_size = 1024;
stm32x_info->ppage_size = 4;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revA */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 32k flash");
num_pages = 32;
}
}
else if ((device_id & 0x7ff) == 0x414)
{
/* high density - we have 2k pages
* 2 pages for a protection area */
page_size = 2048;
stm32x_info->ppage_size = 2;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revZ */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 512k flash");
num_pages = 512;
}
}
else if ((device_id & 0x7ff) == 0x418)
{
/* connectivity line density - we have 2k pages
* 2 pages for a protection area */
page_size = 2048;
stm32x_info->ppage_size = 2;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revZ */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 256k flash");
num_pages = 256;
}
}
else if ((device_id & 0x7ff) == 0x420)
{
/* value line density - we have 1k pages
* 4 pages for a protection area */
page_size = 1024;
stm32x_info->ppage_size = 4;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors may be incorrrect on early silicon */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 128k flash");
num_pages = 128;
}
}
else if ((device_id & 0x7ff) == 0x430)
{
/* xl line density - we have 2k pages
* 2 pages for a protection area */
page_size = 2048;
stm32x_info->ppage_size = 2;
stm32x_info->has_dual_banks = true;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors may be incorrrect on early silicon */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 1024k flash");
num_pages = 1024;
}
/* split reported size into matching bank */
if (bank->base != 0x08080000)
{
/* bank 0 will be fixed 512k */
num_pages = 512;
}
else
{
num_pages -= 512;
/* bank1 also uses a register offset */
stm32x_info->register_offset = FLASH_OFFSET_B1;
base_address = 0x08080000;
}
}
else
{
LOG_WARNING("Cannot identify target as a STM32 family.");
return ERROR_FAIL;
}
LOG_INFO("flash size = %dkbytes", num_pages);
/* calculate numbers of pages */
num_pages /= (page_size / 1024);
if (bank->sectors)
{
free(bank->sectors);
bank->sectors = NULL;
}
bank->base = base_address;
bank->size = (num_pages * page_size);
bank->num_sectors = num_pages;
bank->sectors = malloc(sizeof(struct flash_sector) * num_pages);
for (i = 0; i < num_pages; i++)
{
bank->sectors[i].offset = i * page_size;
bank->sectors[i].size = page_size;
bank->sectors[i].is_erased = -1;
bank->sectors[i].is_protected = 1;
}
stm32x_info->probed = 1;
return ERROR_OK;
}
/* Data polling algorithm */
static int fm3_busy_wait(struct target *target, uint32_t offset, int timeout_ms)
{
int retval = ERROR_OK;
uint16_t state1, state2;
int ms = 0;
/* While(1) loop exit via "break" and "return" on error */
while(1)
{
/* dummy-read - see flash manual */
retval = target_read_u16(target, offset, &state1);
if (retval != ERROR_OK)
return retval;
/* Data polling 1 */
retval = target_read_u16(target, offset, &state1);
if (retval != ERROR_OK)
return retval;
/* Data polling 2 */
retval = target_read_u16(target, offset, &state2);
if (retval != ERROR_OK)
return retval;
/* Flash command finished via polled data equal? */
if ( (state1 & FLASH_DQ6) == (state2 & FLASH_DQ6) )
{
break;
}
/* Timeout Flag? */
else if (state1 & FLASH_DQ5)
{
/* Retry data polling */
/* Data polling 1 */
retval = target_read_u16(target, offset, &state1);
if (retval != ERROR_OK)
return retval;
/* Data polling 2 */
retval = target_read_u16(target, offset, &state2);
if (retval != ERROR_OK)
return retval;
/* Flash command finished via polled data equal? */
if ( (state1 & FLASH_DQ6) != (state2 & FLASH_DQ6) )
{
return ERROR_FLASH_OPERATION_FAILED;
}
/* finish anyway */
break;
}
usleep(1000);
++ms;
/* Polling time exceeded? */
if (ms > timeout_ms)
{
LOG_ERROR("Polling data reading timed out!");
return ERROR_FLASH_OPERATION_FAILED;
}
}
if (retval == ERROR_OK)
LOG_DEBUG("fm3_busy_wait(%x) needs about %d ms", offset, ms);
return retval;
}
static int uCOS_III_update_threads(struct rtos *rtos)
{
struct uCOS_III_params *params = rtos->rtos_specific_params;
int retval;
/* free previous thread details */
rtos_free_threadlist(rtos);
/* verify RTOS is running */
uint8_t rtos_running;
retval = target_read_u8(rtos->target,
rtos->symbols[uCOS_III_VAL_OSRunning].address,
&rtos_running);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to read RTOS running");
return retval;
}
if (rtos_running != 1 && rtos_running != 0) {
LOG_ERROR("uCOS-III: invalid RTOS running value");
return ERROR_FAIL;
}
if (!rtos_running) {
rtos->thread_details = calloc(1, sizeof(struct thread_detail));
if (rtos->thread_details == NULL) {
LOG_ERROR("uCOS-III: out of memory");
return ERROR_FAIL;
}
rtos->thread_count = 1;
rtos->thread_details->threadid = 0;
rtos->thread_details->exists = true;
rtos->current_thread = 0;
return ERROR_OK;
}
/* update thread offsets */
retval = uCOS_III_update_thread_offsets(rtos);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to update thread offsets");
return retval;
}
/* read current thread address */
symbol_address_t current_thread_address = 0;
retval = target_read_memory(rtos->target,
rtos->symbols[uCOS_III_VAL_OSTCBCurPtr].address,
params->pointer_width,
1,
(void *)¤t_thread_address);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to read current thread address");
return retval;
}
/* read number of tasks */
retval = target_read_u16(rtos->target,
rtos->symbols[uCOS_III_VAL_OSTaskQty].address,
(void *)&rtos->thread_count);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to read thread count");
return retval;
}
rtos->thread_details = calloc(rtos->thread_count, sizeof(struct thread_detail));
if (rtos->thread_details == NULL) {
LOG_ERROR("uCOS-III: out of memory");
return ERROR_FAIL;
}
/*
* uC/OS-III adds tasks in LIFO order; advance to the end of the
* list and work backwards to preserve the intended order.
*/
symbol_address_t thread_address = 0;
retval = uCOS_III_find_last_thread_address(rtos, &thread_address);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to find last thread address");
return retval;
}
for (int i = 0; i < rtos->thread_count; i++) {
struct thread_detail *thread_detail = &rtos->thread_details[i];
char thread_str_buffer[UCOS_III_MAX_STRLEN + 1];
/* find or create new threadid */
retval = uCOS_III_find_or_create_thread(rtos, thread_address, &thread_detail->threadid);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to find or create thread");
return retval;
}
if (thread_address == current_thread_address)
rtos->current_thread = thread_detail->threadid;
thread_detail->exists = true;
/* read thread name */
symbol_address_t thread_name_address = 0;
retval = target_read_memory(rtos->target,
thread_address + params->thread_name_offset,
params->pointer_width,
1,
(void *)&thread_name_address);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to name address");
return retval;
}
retval = target_read_buffer(rtos->target,
thread_name_address,
sizeof(thread_str_buffer),
(void *)thread_str_buffer);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to read thread name");
return retval;
}
thread_str_buffer[sizeof(thread_str_buffer) - 1] = '\0';
thread_detail->thread_name_str = strdup(thread_str_buffer);
/* read thread extra info */
uint8_t thread_state;
uint8_t thread_priority;
retval = target_read_u8(rtos->target,
thread_address + params->thread_state_offset,
&thread_state);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to read thread state");
return retval;
}
retval = target_read_u8(rtos->target,
thread_address + params->thread_priority_offset,
&thread_priority);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to read thread priority");
return retval;
}
const char *thread_state_str;
if (thread_state < ARRAY_SIZE(uCOS_III_thread_state_list))
thread_state_str = uCOS_III_thread_state_list[thread_state];
else
thread_state_str = "Unknown";
snprintf(thread_str_buffer, sizeof(thread_str_buffer), "State: %s, Priority: %d",
thread_state_str, thread_priority);
thread_detail->extra_info_str = strdup(thread_str_buffer);
/* read previous thread address */
retval = target_read_memory(rtos->target,
thread_address + params->thread_prev_offset,
params->pointer_width,
1,
(void *)&thread_address);
if (retval != ERROR_OK) {
LOG_ERROR("uCOS-III: failed to read previous thread address");
return retval;
}
}
return ERROR_OK;
}
static int stm32lx_probe(struct flash_bank *bank)
{
struct target *target = bank->target;
struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
int i;
uint16_t flash_size_in_kb;
uint16_t max_flash_size_in_kb;
uint32_t device_id;
uint32_t base_address = FLASH_BANK0_ADDRESS;
uint32_t second_bank_base;
uint32_t first_bank_size_in_kb;
stm32lx_info->probed = 0;
/* read stm32 device id register */
int retval = target_read_u32(target, DBGMCU_IDCODE, &device_id);
if (retval != ERROR_OK)
return retval;
LOG_DEBUG("device id = 0x%08" PRIx32 "", device_id);
/* set max flash size depending on family */
switch (device_id & 0xfff) {
case 0x416:
max_flash_size_in_kb = 128;
break;
case 0x427:
/* single bank, high density */
max_flash_size_in_kb = 256;
break;
case 0x436:
/* According to ST, the devices with id 0x436 have dual bank flash and comes with
* a total flash size of 384k or 256kb. However, the first bank is always 192kb,
* and second one holds the rest. The reason is that the 256kb version is actually
* the same physical flash but only the first 256kb are verified.
*/
max_flash_size_in_kb = 384;
first_bank_size_in_kb = 192;
stm32lx_info->has_dual_banks = true;
break;
default:
LOG_WARNING("Cannot identify target as a STM32L family.");
return ERROR_FAIL;
}
/* Get the flash size from target. */
retval = target_read_u16(target, F_SIZE, &flash_size_in_kb);
/* Failed reading flash size or flash size invalid (early silicon),
* default to max target family */
if (retval != ERROR_OK || flash_size_in_kb == 0xffff || flash_size_in_kb == 0) {
LOG_WARNING("STM32L flash size failed, probe inaccurate - assuming %dk flash",
max_flash_size_in_kb);
flash_size_in_kb = max_flash_size_in_kb;
} else if (flash_size_in_kb > max_flash_size_in_kb) {
LOG_WARNING("STM32L probed flash size assumed incorrect since FLASH_SIZE=%dk > %dk, - assuming %dk flash",
flash_size_in_kb, max_flash_size_in_kb, max_flash_size_in_kb);
flash_size_in_kb = max_flash_size_in_kb;
}
if (stm32lx_info->has_dual_banks) {
/* Use the configured base address to determine if this is the first or second flash bank.
* Verify that the base address is reasonably correct and determine the flash bank size
*/
second_bank_base = base_address + first_bank_size_in_kb * 1024;
if (bank->base == second_bank_base) {
/* This is the second bank */
base_address = second_bank_base;
flash_size_in_kb = flash_size_in_kb - first_bank_size_in_kb;
} else if (bank->base == 0 || bank->base == base_address) {
/* This is the first bank */
flash_size_in_kb = first_bank_size_in_kb;
} else {
LOG_WARNING("STM32L flash bank base address config is incorrect. 0x%x but should rather be 0x%x or 0x%x",
bank->base, base_address, second_bank_base);
return ERROR_FAIL;
}
LOG_INFO("STM32L flash has dual banks. Bank (%d) size is %dkb, base address is 0x%x",
bank->bank_number, flash_size_in_kb, base_address);
} else {
LOG_INFO("STM32L flash size is %dkb, base address is 0x%x", flash_size_in_kb, base_address);
}
/* if the user sets the size manually then ignore the probed value
* this allows us to work around devices that have a invalid flash size register value */
if (stm32lx_info->user_bank_size) {
flash_size_in_kb = stm32lx_info->user_bank_size / 1024;
LOG_INFO("ignoring flash probed value, using configured bank size: %dkbytes", flash_size_in_kb);
}
/* STM32L - we have 32 sectors, 16 pages per sector -> 512 pages
* 16 pages for a protection area */
/* calculate numbers of sectors (4kB per sector) */
int num_sectors = (flash_size_in_kb * 1024) / FLASH_SECTOR_SIZE;
if (bank->sectors) {
free(bank->sectors);
bank->sectors = NULL;
}
bank->size = flash_size_in_kb * 1024;
bank->base = base_address;
bank->num_sectors = num_sectors;
bank->sectors = malloc(sizeof(struct flash_sector) * num_sectors);
if (bank->sectors == NULL) {
LOG_ERROR("failed to allocate bank sectors");
return ERROR_FAIL;
}
for (i = 0; i < num_sectors; i++) {
bank->sectors[i].offset = i * FLASH_SECTOR_SIZE;
bank->sectors[i].size = FLASH_SECTOR_SIZE;
bank->sectors[i].is_erased = -1;
bank->sectors[i].is_protected = 1;
}
stm32lx_info->probed = 1;
return ERROR_OK;
}
static int stm32x_probe(struct flash_bank *bank)
{
struct target *target = bank->target;
struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
int i;
uint16_t num_pages;
uint32_t device_id;
int page_size;
if (bank->target->state != TARGET_HALTED)
{
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
stm32x_info->probed = 0;
/* read stm32 device id register */
target_read_u32(target, 0xE0042000, &device_id);
LOG_INFO("device id = 0x%08" PRIx32 "", device_id);
/* get flash size from target */
if (target_read_u16(target, 0x1FFFF7E0, &num_pages) != ERROR_OK)
{
/* failed reading flash size, default to max target family */
num_pages = 0xffff;
}
if ((device_id & 0x7ff) == 0x410)
{
/* medium density - we have 1k pages
* 4 pages for a protection area */
page_size = 1024;
stm32x_info->ppage_size = 4;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revA */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 128k flash");
num_pages = 128;
}
}
else if ((device_id & 0x7ff) == 0x412)
{
/* low density - we have 1k pages
* 4 pages for a protection area */
page_size = 1024;
stm32x_info->ppage_size = 4;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revA */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 32k flash");
num_pages = 32;
}
}
else if ((device_id & 0x7ff) == 0x414)
{
/* high density - we have 2k pages
* 2 pages for a protection area */
page_size = 2048;
stm32x_info->ppage_size = 2;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revZ */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 512k flash");
num_pages = 512;
}
}
else if ((device_id & 0x7ff) == 0x418)
{
/* connectivity line density - we have 2k pages
* 2 pages for a protection area */
page_size = 2048;
stm32x_info->ppage_size = 2;
/* check for early silicon */
if (num_pages == 0xffff)
{
/* number of sectors incorrect on revZ */
LOG_WARNING("STM32 flash size failed, probe inaccurate - assuming 256k flash");
num_pages = 256;
}
}
else
{
LOG_WARNING("Cannot identify target as a STM32 family.");
return ERROR_FLASH_OPERATION_FAILED;
}
LOG_INFO("flash size = %dkbytes", num_pages);
/* calculate numbers of pages */
num_pages /= (page_size / 1024);
bank->base = 0x08000000;
bank->size = (num_pages * page_size);
bank->num_sectors = num_pages;
bank->sectors = malloc(sizeof(struct flash_sector) * num_pages);
for (i = 0; i < num_pages; i++)
{
bank->sectors[i].offset = i * page_size;
bank->sectors[i].size = page_size;
bank->sectors[i].is_erased = -1;
bank->sectors[i].is_protected = 1;
}
stm32x_info->probed = 1;
return ERROR_OK;
}
/**
* Checks for and processes an ARM semihosting request. This is meant
* to be called when the target is stopped due to a debug mode entry.
* If the value 0 is returned then there was nothing to process. A non-zero
* return value signifies that a request was processed and the target resumed,
* or an error was encountered, in which case the caller must return
* immediately.
*
* @param target Pointer to the ARM target to process. This target must
* not represent an ARMv6-M or ARMv7-M processor.
* @param retval Pointer to a location where the return code will be stored
* @return non-zero value if a request was processed or an error encountered
*/
int arm_semihosting(struct target *target, int *retval)
{
struct arm *arm = target_to_arm(target);
uint32_t pc, lr, spsr;
struct reg *r;
if (!arm->is_semihosting)
return 0;
if (is_arm7_9(target_to_arm7_9(target))) {
if (arm->core_mode != ARM_MODE_SVC)
return 0;
/* Check for PC == 0x00000008 or 0xffff0008: Supervisor Call vector. */
r = arm->pc;
pc = buf_get_u32(r->value, 0, 32);
if (pc != 0x00000008 && pc != 0xffff0008)
return 0;
r = arm_reg_current(arm, 14);
lr = buf_get_u32(r->value, 0, 32);
/* Core-specific code should make sure SPSR is retrieved
* when the above checks pass...
*/
if (!arm->spsr->valid) {
LOG_ERROR("SPSR not valid!");
*retval = ERROR_FAIL;
return 1;
}
spsr = buf_get_u32(arm->spsr->value, 0, 32);
/* check instruction that triggered this trap */
if (spsr & (1 << 5)) {
/* was in Thumb (or ThumbEE) mode */
uint8_t insn_buf[2];
uint16_t insn;
*retval = target_read_memory(target, lr-2, 2, 1, insn_buf);
if (*retval != ERROR_OK)
return 1;
insn = target_buffer_get_u16(target, insn_buf);
/* SVC 0xab */
if (insn != 0xDFAB)
return 0;
} else if (spsr & (1 << 24)) {
/* was in Jazelle mode */
return 0;
} else {
/* was in ARM mode */
uint8_t insn_buf[4];
uint32_t insn;
*retval = target_read_memory(target, lr-4, 4, 1, insn_buf);
if (*retval != ERROR_OK)
return 1;
insn = target_buffer_get_u32(target, insn_buf);
/* SVC 0x123456 */
if (insn != 0xEF123456)
return 0;
}
} else if (is_armv7m(target_to_armv7m(target))) {
uint16_t insn;
if (target->debug_reason != DBG_REASON_BREAKPOINT)
return 0;
r = arm->pc;
pc = buf_get_u32(r->value, 0, 32);
pc &= ~1;
*retval = target_read_u16(target, pc, &insn);
if (*retval != ERROR_OK)
return 1;
/* bkpt 0xAB */
if (insn != 0xBEAB)
return 0;
} else {
LOG_ERROR("Unsupported semi-hosting Target");
return 0;
}
*retval = do_semihosting(target);
return 1;
}
/**
* Checks for and processes an ARM semihosting request. This is meant
* to be called when the target is stopped due to a debug mode entry.
* If the value 0 is returned then there was nothing to process. A non-zero
* return value signifies that a request was processed and the target resumed,
* or an error was encountered, in which case the caller must return
* immediately.
*
* @param target Pointer to the ARM target to process. This target must
* not represent an ARMv6-M or ARMv7-M processor.
* @param retval Pointer to a location where the return code will be stored
* @return non-zero value if a request was processed or an error encountered
*/
int arm_semihosting(struct target *target, int *retval)
{
struct arm *arm = target_to_arm(target);
struct armv7a_common *armv7a = target_to_armv7a(target);
uint32_t pc, lr, spsr;
struct reg *r;
if (!arm->is_semihosting)
return 0;
if (is_arm7_9(target_to_arm7_9(target)) ||
is_armv7a(armv7a)) {
uint32_t vbar = 0x00000000;
if (arm->core_mode != ARM_MODE_SVC)
return 0;
if (is_armv7a(armv7a)) {
struct arm_dpm *dpm = armv7a->arm.dpm;
*retval = dpm->prepare(dpm);
if (*retval == ERROR_OK) {
*retval = dpm->instr_read_data_r0(dpm,
ARMV4_5_MRC(15, 0, 0, 12, 0, 0),
&vbar);
dpm->finish(dpm);
if (*retval != ERROR_OK)
return 1;
} else {
return 1;
}
}
/* Check for PC == 0x00000008 or 0xffff0008: Supervisor Call vector. */
r = arm->pc;
pc = buf_get_u32(r->value, 0, 32);
if (pc != (vbar + 0x00000008) && pc != 0xffff0008)
return 0;
r = arm_reg_current(arm, 14);
lr = buf_get_u32(r->value, 0, 32);
/* Core-specific code should make sure SPSR is retrieved
* when the above checks pass...
*/
if (!arm->spsr->valid) {
LOG_ERROR("SPSR not valid!");
*retval = ERROR_FAIL;
return 1;
}
spsr = buf_get_u32(arm->spsr->value, 0, 32);
/* check instruction that triggered this trap */
if (spsr & (1 << 5)) {
/* was in Thumb (or ThumbEE) mode */
uint8_t insn_buf[2];
uint16_t insn;
*retval = target_read_memory(target, lr-2, 2, 1, insn_buf);
if (*retval != ERROR_OK)
return 1;
insn = target_buffer_get_u16(target, insn_buf);
/* SVC 0xab */
if (insn != 0xDFAB)
return 0;
} else if (spsr & (1 << 24)) {
/* was in Jazelle mode */
return 0;
} else {
/* was in ARM mode */
uint8_t insn_buf[4];
uint32_t insn;
*retval = target_read_memory(target, lr-4, 4, 1, insn_buf);
if (*retval != ERROR_OK)
return 1;
insn = target_buffer_get_u32(target, insn_buf);
/* SVC 0x123456 */
if (insn != 0xEF123456)
return 0;
}
} else if (is_armv7m(target_to_armv7m(target))) {
uint16_t insn;
if (target->debug_reason != DBG_REASON_BREAKPOINT)
return 0;
r = arm->pc;
pc = buf_get_u32(r->value, 0, 32);
pc &= ~1;
*retval = target_read_u16(target, pc, &insn);
if (*retval != ERROR_OK)
return 1;
/* bkpt 0xAB */
if (insn != 0xBEAB)
return 0;
} else {
LOG_ERROR("Unsupported semi-hosting Target");
return 0;
}
/* Perform semihosting if we are not waiting on a fileio
* operation to complete.
*/
if (!arm->semihosting_hit_fileio) {
*retval = do_semihosting(target);
if (*retval != ERROR_OK) {
LOG_ERROR("Failed semihosting operation");
return 0;
}
}
/* Post result to target if we are not waiting on a fileio
* operation to complete:
*/
if (!arm->semihosting_hit_fileio) {
*retval = post_result(target);
if (*retval != ERROR_OK) {
LOG_ERROR("Failed to post semihosting result");
return 0;
}
*retval = target_resume(target, 1, 0, 0, 0);
if (*retval != ERROR_OK) {
LOG_ERROR("Failed to resume target");
return 0;
}
return 1;
}
return 0;
}
