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openocd/src/target/stm8.c

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/*
* OpenOCD STM8 target driver
* Copyright (C) 2017 Ake Rehnman
* ake.rehnman(at)gmail.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <helper/log.h>
#include "target.h"
#include "target_type.h"
#include "hello.h"
#include "jtag/interface.h"
#include "jtag/jtag.h"
#include "jtag/swim.h"
#include "register.h"
#include "breakpoints.h"
#include "algorithm.h"
#include "stm8.h"
static struct reg_cache *stm8_build_reg_cache(struct target *target);
static int stm8_read_core_reg(struct target *target, unsigned int num);
static int stm8_write_core_reg(struct target *target, unsigned int num);
static int stm8_save_context(struct target *target);
static void stm8_enable_breakpoints(struct target *target);
static int stm8_unset_breakpoint(struct target *target,
struct breakpoint *breakpoint);
static int stm8_set_breakpoint(struct target *target,
struct breakpoint *breakpoint);
static void stm8_enable_watchpoints(struct target *target);
static int stm8_unset_watchpoint(struct target *target,
struct watchpoint *watchpoint);
static const struct {
unsigned id;
const char *name;
const uint8_t bits;
enum reg_type type;
const char *group;
const char *feature;
int flag;
} stm8_regs[] = {
{ 0, "pc", 32, REG_TYPE_UINT32, "general", "org.gnu.gdb.stm8.core", 0 },
{ 1, "a", 8, REG_TYPE_UINT8, "general", "org.gnu.gdb.stm8.core", 0 },
{ 2, "x", 16, REG_TYPE_UINT16, "general", "org.gnu.gdb.stm8.core", 0 },
{ 3, "y", 16, REG_TYPE_UINT16, "general", "org.gnu.gdb.stm8.core", 0 },
{ 4, "sp", 16, REG_TYPE_UINT16, "general", "org.gnu.gdb.stm8.core", 0 },
{ 5, "cc", 8, REG_TYPE_UINT8, "general", "org.gnu.gdb.stm8.core", 0 },
};
#define STM8_NUM_REGS ARRAY_SIZE(stm8_regs)
#define STM8_PC 0
#define STM8_A 1
#define STM8_X 2
#define STM8_Y 3
#define STM8_SP 4
#define STM8_CC 5
#define CC_I0 0x8
#define CC_I1 0x20
#define DM_REGS 0x7f00
#define DM_REG_A 0x7f00
#define DM_REG_PC 0x7f01
#define DM_REG_X 0x7f04
#define DM_REG_Y 0x7f06
#define DM_REG_SP 0x7f08
#define DM_REG_CC 0x7f0a
#define DM_BKR1E 0x7f90
#define DM_BKR2E 0x7f93
#define DM_CR1 0x7f96
#define DM_CR2 0x7f97
#define DM_CSR1 0x7f98
#define DM_CSR2 0x7f99
#define STE 0x40
#define STF 0x20
#define RST 0x10
#define BRW 0x08
#define BK2F 0x04
#define BK1F 0x02
#define SWBRK 0x20
#define SWBKF 0x10
#define STALL 0x08
#define FLUSH 0x01
#define FLASH_CR1_STM8S 0x505A
#define FLASH_CR2_STM8S 0x505B
#define FLASH_NCR2_STM8S 0x505C
#define FLASH_IAPSR_STM8S 0x505F
#define FLASH_PUKR_STM8S 0x5062
#define FLASH_DUKR_STM8S 0x5064
#define FLASH_CR1_STM8L 0x5050
#define FLASH_CR2_STM8L 0x5051
#define FLASH_NCR2_STM8L 0
#define FLASH_PUKR_STM8L 0x5052
#define FLASH_DUKR_STM8L 0x5053
#define FLASH_IAPSR_STM8L 0x5054
/* FLASH_IAPSR */
#define HVOFF 0x40
#define DUL 0x08
#define EOP 0x04
#define PUL 0x02
#define WR_PG_DIS 0x01
/* FLASH_CR2 */
#define OPT 0x80
#define WPRG 0x40
#define ERASE 0x20
#define FPRG 0x10
#define PRG 0x01
/* SWIM_CSR */
#define SAFE_MASK 0x80
#define NO_ACCESS 0x40
#define SWIM_DM 0x20
#define HS 0x10
#define OSCOFF 0x08
#define SWIM_RST 0x04
#define HSIT 0x02
#define PRI 0x01
#define SWIM_CSR 0x7f80
#define STM8_BREAK 0x8B
enum mem_type {
RAM,
FLASH,
EEPROM,
OPTION
};
struct stm8_algorithm {
int common_magic;
};
struct stm8_core_reg {
uint32_t num;
struct target *target;
struct stm8_common *stm8_common;
};
enum hw_break_type {
/* break on execute */
HWBRK_EXEC,
/* break on read */
HWBRK_RD,
/* break on write */
HWBRK_WR,
/* break on read, write and execute */
HWBRK_ACC
};
struct stm8_comparator {
bool used;
uint32_t bp_value;
uint32_t reg_address;
enum hw_break_type type;
};
static int stm8_adapter_read_memory(struct target *target,
uint32_t addr, int size, int count, void *buf)
{
return swim_read_mem(addr, size, count, buf);
}
static int stm8_adapter_write_memory(struct target *target,
uint32_t addr, int size, int count, const void *buf)
{
return swim_write_mem(addr, size, count, buf);
}
static int stm8_write_u8(struct target *target,
uint32_t addr, uint8_t val)
{
uint8_t buf[1];
buf[0] = val;
return swim_write_mem(addr, 1, 1, buf);
}
static int stm8_read_u8(struct target *target,
uint32_t addr, uint8_t *val)
{
return swim_read_mem(addr, 1, 1, val);
}
/*
<enable == 0> Disables interrupts.
If interrupts are enabled they are masked and the cc register
is saved.
<enable == 1> Enables interrupts.
Enable interrupts is actually restoring I1 I0 state from previous
call with enable == 0. Note that if stepping and breaking on a sim
instruction will NOT work since the interrupt flags are restored on
debug_entry. We don't have any way for the debugger to exclusively
disable the interrupts
*/
static int stm8_enable_interrupts(struct target *target, int enable)
{
struct stm8_common *stm8 = target_to_stm8(target);
uint8_t cc;
if (enable) {
if (!stm8->cc_valid)
return ERROR_OK; /* cc was not stashed */
/* fetch current cc */
stm8_read_u8(target, DM_REG_CC, &cc);
/* clear I1 I0 */
cc &= ~(CC_I0 + CC_I1);
/* restore I1 & I0 from stash*/
cc |= (stm8->cc & (CC_I0+CC_I1));
/* update current cc */
stm8_write_u8(target, DM_REG_CC, cc);
stm8->cc_valid = false;
} else {
stm8_read_u8(target, DM_REG_CC, &cc);
if ((cc & CC_I0) && (cc & CC_I1))
return ERROR_OK; /* interrupts already masked */
/* stash cc */
stm8->cc = cc;
stm8->cc_valid = true;
/* mask interrupts (disable) */
cc |= (CC_I0 + CC_I1);
stm8_write_u8(target, DM_REG_CC, cc);
}
return ERROR_OK;
}
static int stm8_set_hwbreak(struct target *target,
struct stm8_comparator comparator_list[])
{
uint8_t buf[3];
int i, ret;
/* Refer to Table 4 in UM0470 */
uint8_t bc = 0x5;
uint8_t bir = 0;
uint8_t biw = 0;
uint32_t data;
uint32_t addr;
if (!comparator_list[0].used) {
comparator_list[0].type = HWBRK_EXEC;
comparator_list[0].bp_value = -1;
}
if (!comparator_list[1].used) {
comparator_list[1].type = HWBRK_EXEC;
comparator_list[1].bp_value = -1;
}
if ((comparator_list[0].type == HWBRK_EXEC)
&& (comparator_list[1].type == HWBRK_EXEC)) {
comparator_list[0].reg_address = 0;
comparator_list[1].reg_address = 1;
}
if ((comparator_list[0].type == HWBRK_EXEC)
&& (comparator_list[1].type != HWBRK_EXEC)) {
comparator_list[0].reg_address = 0;
comparator_list[1].reg_address = 1;
switch (comparator_list[1].type) {
case HWBRK_RD:
bir = 1;
break;
case HWBRK_WR:
biw = 1;
break;
default:
bir = 1;
biw = 1;
break;
}
}
if ((comparator_list[1].type == HWBRK_EXEC)
&& (comparator_list[0].type != HWBRK_EXEC)) {
comparator_list[0].reg_address = 1;
comparator_list[1].reg_address = 0;
switch (comparator_list[0].type) {
case HWBRK_RD:
bir = 1;
break;
case HWBRK_WR:
biw = 1;
break;
default:
bir = 1;
biw = 1;
break;
}
}
if ((comparator_list[0].type != HWBRK_EXEC)
&& (comparator_list[1].type != HWBRK_EXEC)) {
if (comparator_list[0].type != comparator_list[1].type) {
LOG_ERROR("data hw breakpoints must be of same type");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
}
for (i = 0; i < 2; i++) {
data = comparator_list[i].bp_value;
addr = comparator_list[i].reg_address;
buf[0] = data >> 16;
buf[1] = data >> 8;
buf[2] = data;
if (addr == 0) {
ret = stm8_adapter_write_memory(target, DM_BKR1E, 1, 3, buf);
LOG_DEBUG("DM_BKR1E=%" PRIx32, data);
} else if (addr == 1) {
ret = stm8_adapter_write_memory(target, DM_BKR2E, 1, 3, buf);
LOG_DEBUG("DM_BKR2E=%" PRIx32, data);
} else {
LOG_DEBUG("addr=%" PRIu32, addr);
return ERROR_FAIL;
}
if (ret != ERROR_OK)
return ret;
ret = stm8_write_u8(target, DM_CR1,
(bc << 3) + (bir << 2) + (biw << 1));
LOG_DEBUG("DM_CR1=%" PRIx8, buf[0]);
if (ret != ERROR_OK)
return ret;
}
return ERROR_OK;
}
/* read DM control and status regs */
static int stm8_read_dm_csrx(struct target *target, uint8_t *csr1,
uint8_t *csr2)
{
int ret;
uint8_t buf[2];
ret = stm8_adapter_read_memory(target, DM_CSR1, 1, sizeof(buf), buf);
if (ret != ERROR_OK)
return ret;
if (csr1)
*csr1 = buf[0];
if (csr2)
*csr2 = buf[1];
return ERROR_OK;
}
/* set or clear the single step flag in DM */
static int stm8_config_step(struct target *target, int enable)
{
int ret;
uint8_t csr1, csr2;
ret = stm8_read_dm_csrx(target, &csr1, &csr2);
if (ret != ERROR_OK)
return ret;
if (enable)
csr1 |= STE;
else
csr1 &= ~STE;
ret = stm8_write_u8(target, DM_CSR1, csr1);
if (ret != ERROR_OK)
return ret;
return ERROR_OK;
}
/* set the stall flag in DM */
static int stm8_debug_stall(struct target *target)
{
int ret;
uint8_t csr1, csr2;
ret = stm8_read_dm_csrx(target, &csr1, &csr2);
if (ret != ERROR_OK)
return ret;
csr2 |= STALL;
ret = stm8_write_u8(target, DM_CSR2, csr2);
if (ret != ERROR_OK)
return ret;
return ERROR_OK;
}
static int stm8_configure_break_unit(struct target *target)
{
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
if (stm8->bp_scanned)
return ERROR_OK;
stm8->num_hw_bpoints = 2;
stm8->num_hw_bpoints_avail = stm8->num_hw_bpoints;
stm8->hw_break_list = calloc(stm8->num_hw_bpoints,
sizeof(struct stm8_comparator));
stm8->hw_break_list[0].reg_address = 0;
stm8->hw_break_list[1].reg_address = 1;
LOG_DEBUG("hw breakpoints: numinst %i numdata %i", stm8->num_hw_bpoints,
stm8->num_hw_bpoints);
stm8->bp_scanned = true;
return ERROR_OK;
}
static int stm8_examine_debug_reason(struct target *target)
{
int retval;
uint8_t csr1, csr2;
retval = stm8_read_dm_csrx(target, &csr1, &csr2);
if (retval == ERROR_OK)
LOG_DEBUG("csr1 = 0x%02X csr2 = 0x%02X", csr1, csr2);
if ((target->debug_reason != DBG_REASON_DBGRQ)
&& (target->debug_reason != DBG_REASON_SINGLESTEP)) {
if (retval != ERROR_OK)
return retval;
if (csr1 & RST)
/* halted on reset */
target->debug_reason = DBG_REASON_UNDEFINED;
if (csr1 & (BK1F+BK2F))
/* we have halted on a breakpoint (or wp)*/
target->debug_reason = DBG_REASON_BREAKPOINT;
if (csr2 & SWBKF)
/* we have halted on a breakpoint */
target->debug_reason = DBG_REASON_BREAKPOINT;
}
return ERROR_OK;
}
static int stm8_debug_entry(struct target *target)
{
struct stm8_common *stm8 = target_to_stm8(target);
/* restore interrupts */
stm8_enable_interrupts(target, 1);
stm8_save_context(target);
/* make sure stepping disabled STE bit in CSR1 cleared */
stm8_config_step(target, 0);
/* attempt to find halt reason */
stm8_examine_debug_reason(target);
LOG_DEBUG("entered debug state at PC 0x%" PRIx32 ", target->state: %s",
buf_get_u32(stm8->core_cache->reg_list[STM8_PC].value, 0, 32),
target_state_name(target));
return ERROR_OK;
}
/* clear stall flag in DM and flush instruction pipe */
static int stm8_exit_debug(struct target *target)
{
int ret;
uint8_t csr1, csr2;
ret = stm8_read_dm_csrx(target, &csr1, &csr2);
if (ret != ERROR_OK)
return ret;
csr2 |= FLUSH;
ret = stm8_write_u8(target, DM_CSR2, csr2);
if (ret != ERROR_OK)
return ret;
csr2 &= ~STALL;
csr2 |= SWBRK;
ret = stm8_write_u8(target, DM_CSR2, csr2);
if (ret != ERROR_OK)
return ret;
return ERROR_OK;
}
static int stm8_read_regs(struct target *target, uint32_t regs[])
{
int ret;
uint8_t buf[11];
ret = stm8_adapter_read_memory(target, DM_REGS, 1, sizeof(buf), buf);
if (ret != ERROR_OK)
return ret;
regs[0] = be_to_h_u24(buf+DM_REG_PC-DM_REGS);
regs[1] = buf[DM_REG_A-DM_REGS];
regs[2] = be_to_h_u16(buf+DM_REG_X-DM_REGS);
regs[3] = be_to_h_u16(buf+DM_REG_Y-DM_REGS);
regs[4] = be_to_h_u16(buf+DM_REG_SP-DM_REGS);
regs[5] = buf[DM_REG_CC-DM_REGS];
return ERROR_OK;
}
static int stm8_write_regs(struct target *target, uint32_t regs[])
{
int ret;
uint8_t buf[11];
h_u24_to_be(buf+DM_REG_PC-DM_REGS, regs[0]);
buf[DM_REG_A-DM_REGS] = regs[1];
h_u16_to_be(buf+DM_REG_X-DM_REGS, regs[2]);
h_u16_to_be(buf+DM_REG_Y-DM_REGS, regs[3]);
h_u16_to_be(buf+DM_REG_SP-DM_REGS, regs[4]);
buf[DM_REG_CC-DM_REGS] = regs[5];
ret = stm8_adapter_write_memory(target, DM_REGS, 1, sizeof(buf), buf);
if (ret != ERROR_OK)
return ret;
return ERROR_OK;
}
static int stm8_get_core_reg(struct reg *reg)
{
int retval;
struct stm8_core_reg *stm8_reg = reg->arch_info;
struct target *target = stm8_reg->target;
struct stm8_common *stm8_target = target_to_stm8(target);
if (target->state != TARGET_HALTED)
return ERROR_TARGET_NOT_HALTED;
retval = stm8_target->read_core_reg(target, stm8_reg->num);
return retval;
}
static int stm8_set_core_reg(struct reg *reg, uint8_t *buf)
{
struct stm8_core_reg *stm8_reg = reg->arch_info;
struct target *target = stm8_reg->target;
uint32_t value = buf_get_u32(buf, 0, reg->size);
if (target->state != TARGET_HALTED)
return ERROR_TARGET_NOT_HALTED;
buf_set_u32(reg->value, 0, 32, value);
reg->dirty = true;
reg->valid = true;
return ERROR_OK;
}
static int stm8_save_context(struct target *target)
{
unsigned int i;
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
/* read core registers */
stm8_read_regs(target, stm8->core_regs);
for (i = 0; i < STM8_NUM_REGS; i++) {
if (!stm8->core_cache->reg_list[i].valid)
stm8->read_core_reg(target, i);
}
return ERROR_OK;
}
static int stm8_restore_context(struct target *target)
{
unsigned int i;
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
for (i = 0; i < STM8_NUM_REGS; i++) {
if (stm8->core_cache->reg_list[i].dirty)
stm8->write_core_reg(target, i);
}
/* write core regs */
stm8_write_regs(target, stm8->core_regs);
return ERROR_OK;
}
static int stm8_unlock_flash(struct target *target)
{
uint8_t data[1];
struct stm8_common *stm8 = target_to_stm8(target);
/* check if flash is unlocked */
stm8_read_u8(target, stm8->flash_iapsr, data);
if (~data[0] & PUL) {
/* unlock flash */
stm8_write_u8(target, stm8->flash_pukr, 0x56);
stm8_write_u8(target, stm8->flash_pukr, 0xae);
}
stm8_read_u8(target, stm8->flash_iapsr, data);
if (~data[0] & PUL)
return ERROR_FAIL;
return ERROR_OK;
}
static int stm8_unlock_eeprom(struct target *target)
{
uint8_t data[1];
struct stm8_common *stm8 = target_to_stm8(target);
/* check if eeprom is unlocked */
stm8_read_u8(target, stm8->flash_iapsr, data);
if (~data[0] & DUL) {
/* unlock eeprom */
stm8_write_u8(target, stm8->flash_dukr, 0xae);
stm8_write_u8(target, stm8->flash_dukr, 0x56);
}
stm8_read_u8(target, stm8->flash_iapsr, data);
if (~data[0] & DUL)
return ERROR_FAIL;
return ERROR_OK;
}
static int stm8_write_flash(struct target *target, enum mem_type type,
uint32_t address,
uint32_t size, uint32_t count, uint32_t blocksize_param,
const uint8_t *buffer)
{
struct stm8_common *stm8 = target_to_stm8(target);
uint8_t iapsr;
uint8_t opt = 0;
unsigned int i;
uint32_t blocksize = 0;
uint32_t bytecnt;
int res;
switch (type) {
case (FLASH):
stm8_unlock_flash(target);
break;
case (EEPROM):
stm8_unlock_eeprom(target);
break;
case (OPTION):
stm8_unlock_eeprom(target);
opt = OPT;
break;
default:
LOG_ERROR("BUG: wrong mem_type %d", type);
assert(0);
}
if (size == 2) {
/* we don't support short writes */
count = count * 2;
size = 1;
}
bytecnt = count * size;
while (bytecnt) {
if ((bytecnt >= blocksize_param) && ((address & (blocksize_param-1)) == 0)) {
if (stm8->flash_cr2)
stm8_write_u8(target, stm8->flash_cr2, PRG + opt);
if (stm8->flash_ncr2)
stm8_write_u8(target, stm8->flash_ncr2, ~(PRG + opt));
blocksize = blocksize_param;
} else
if ((bytecnt >= 4) && ((address & 0x3) == 0)) {
if (stm8->flash_cr2)
stm8_write_u8(target, stm8->flash_cr2, WPRG + opt);
if (stm8->flash_ncr2)
stm8_write_u8(target, stm8->flash_ncr2, ~(WPRG + opt));
blocksize = 4;
} else
if (blocksize != 1) {
if (stm8->flash_cr2)
stm8_write_u8(target, stm8->flash_cr2, opt);
if (stm8->flash_ncr2)
stm8_write_u8(target, stm8->flash_ncr2, ~opt);
blocksize = 1;
}
res = stm8_adapter_write_memory(target, address, 1, blocksize, buffer);
if (res != ERROR_OK)
return res;
address += blocksize;
buffer += blocksize;
bytecnt -= blocksize;
/* lets hang here until end of program (EOP) */
for (i = 0; i < 16; i++) {
stm8_read_u8(target, stm8->flash_iapsr, &iapsr);
if (iapsr & EOP)
break;
else
usleep(1000);
}
if (i == 16)
return ERROR_FAIL;
}
/* disable write access */
res = stm8_write_u8(target, stm8->flash_iapsr, 0x0);
if (res != ERROR_OK)
return ERROR_FAIL;
return ERROR_OK;
}
static int stm8_write_memory(struct target *target, target_addr_t address,
uint32_t size, uint32_t count,
const uint8_t *buffer)
{
struct stm8_common *stm8 = target_to_stm8(target);
LOG_DEBUG("address: 0x%8.8" TARGET_PRIxADDR
", size: 0x%8.8" PRIx32
", count: 0x%8.8" PRIx32,
address, size, count);
if (target->state != TARGET_HALTED)
LOG_WARNING("target not halted");
int retval;
if ((address >= stm8->flashstart) && (address <= stm8->flashend))
retval = stm8_write_flash(target, FLASH, address, size, count,
stm8->blocksize, buffer);
else if ((address >= stm8->eepromstart) && (address <= stm8->eepromend))
retval = stm8_write_flash(target, EEPROM, address, size, count,
stm8->blocksize, buffer);
else if ((address >= stm8->optionstart) && (address <= stm8->optionend))
retval = stm8_write_flash(target, OPTION, address, size, count, 0, buffer);
else
retval = stm8_adapter_write_memory(target, address, size, count,
buffer);
if (retval != ERROR_OK)
return ERROR_TARGET_FAILURE;
return retval;
}
static int stm8_read_memory(struct target *target, target_addr_t address,
uint32_t size, uint32_t count, uint8_t *buffer)
{
LOG_DEBUG("address: 0x%8.8" TARGET_PRIxADDR
", size: 0x%8.8" PRIx32
", count: 0x%8.8" PRIx32,
address, size, count);
if (target->state != TARGET_HALTED)
LOG_WARNING("target not halted");
int retval;
retval = stm8_adapter_read_memory(target, address, size, count, buffer);
if (retval != ERROR_OK)
return ERROR_TARGET_FAILURE;
return retval;
}
static int stm8_init(struct command_context *cmd_ctx, struct target *target)
{
stm8_build_reg_cache(target);
return ERROR_OK;
}
static int stm8_poll(struct target *target)
{
int retval = ERROR_OK;
uint8_t csr1, csr2;
#ifdef LOG_STM8
LOG_DEBUG("target->state=%d", target->state);
#endif
/* read dm_csrx control regs */
retval = stm8_read_dm_csrx(target, &csr1, &csr2);
if (retval != ERROR_OK) {
LOG_DEBUG("stm8_read_dm_csrx failed retval=%d", retval);
/*
We return ERROR_OK here even if we didn't get an answer.
openocd will call target_wait_state until we get target state TARGET_HALTED
*/
return ERROR_OK;
}
/* check for processor halted */
if (csr2 & STALL) {
if (target->state != TARGET_HALTED) {
if (target->state == TARGET_UNKNOWN)
LOG_DEBUG("DM_CSR2_STALL already set during server startup.");
retval = stm8_debug_entry(target);
if (retval != ERROR_OK) {
LOG_DEBUG("stm8_debug_entry failed retval=%d", retval);
return ERROR_TARGET_FAILURE;
}
if (target->state == TARGET_DEBUG_RUNNING) {
target->state = TARGET_HALTED;
target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
} else {
target->state = TARGET_HALTED;
target_call_event_callbacks(target, TARGET_EVENT_HALTED);
}
}
} else
target->state = TARGET_RUNNING;
#ifdef LOG_STM8
LOG_DEBUG("csr1 = 0x%02X csr2 = 0x%02X", csr1, csr2);
#endif
return ERROR_OK;
}
static int stm8_halt(struct target *target)
{
LOG_DEBUG("target->state: %s", target_state_name(target));
if (target->state == TARGET_HALTED) {
LOG_DEBUG("target was already halted");
return ERROR_OK;
}
if (target->state == TARGET_UNKNOWN)
LOG_WARNING("target was in unknown state when halt was requested");
if (target->state == TARGET_RESET) {
/* we came here in a reset_halt or reset_init sequence
* debug entry was already prepared in stm8_assert_reset()
*/
target->debug_reason = DBG_REASON_DBGRQ;
return ERROR_OK;
}
/* break processor */
stm8_debug_stall(target);
target->debug_reason = DBG_REASON_DBGRQ;
return ERROR_OK;
}
static int stm8_reset_assert(struct target *target)
{
int res = ERROR_OK;
struct stm8_common *stm8 = target_to_stm8(target);
bool use_srst_fallback = true;
enum reset_types jtag_reset_config = jtag_get_reset_config();
if (jtag_reset_config & RESET_HAS_SRST) {
res = adapter_assert_reset();
if (res == ERROR_OK)
/* hardware srst supported */
use_srst_fallback = false;
else if (res != ERROR_COMMAND_NOTFOUND)
/* some other failure */
return res;
}
if (use_srst_fallback) {
LOG_DEBUG("Hardware srst not supported, falling back to swim reset");
res = swim_system_reset();
if (res != ERROR_OK)
return res;
}
/* registers are now invalid */
register_cache_invalidate(stm8->core_cache);
target->state = TARGET_RESET;
target->debug_reason = DBG_REASON_NOTHALTED;
if (target->reset_halt) {
res = target_halt(target);
if (res != ERROR_OK)
return res;
}
return ERROR_OK;
}
static int stm8_reset_deassert(struct target *target)
{
int res;
enum reset_types jtag_reset_config = jtag_get_reset_config();
if (jtag_reset_config & RESET_HAS_SRST) {
res = adapter_deassert_reset();
if ((res != ERROR_OK) && (res != ERROR_COMMAND_NOTFOUND))
return res;
}
/* The cpu should now be stalled. If halt was requested
let poll detect the stall */
if (target->reset_halt)
return ERROR_OK;
/* Instead of going thrugh saving context, polling and
then resuming target again just clear stall and proceed. */
target->state = TARGET_RUNNING;
return stm8_exit_debug(target);
}
/* stm8_single_step_core() is only used for stepping over breakpoints
from stm8_resume() */
static int stm8_single_step_core(struct target *target)
{
struct stm8_common *stm8 = target_to_stm8(target);
/* configure single step mode */
stm8_config_step(target, 1);
/* disable interrupts while stepping */
if (!stm8->enable_step_irq)
stm8_enable_interrupts(target, 0);
/* exit debug mode */
stm8_exit_debug(target);
stm8_debug_entry(target);
return ERROR_OK;
}
static int stm8_resume(struct target *target, int current,
target_addr_t address, int handle_breakpoints,
int debug_execution)
{
struct stm8_common *stm8 = target_to_stm8(target);
struct breakpoint *breakpoint = NULL;
uint32_t resume_pc;
LOG_DEBUG("%d " TARGET_ADDR_FMT " %d %d", current, address,
handle_breakpoints, debug_execution);
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (!debug_execution) {
target_free_all_working_areas(target);
stm8_enable_breakpoints(target);
stm8_enable_watchpoints(target);
struct stm8_comparator *comparator_list = stm8->hw_break_list;
stm8_set_hwbreak(target, comparator_list);
}
/* current = 1: continue on current pc,
otherwise continue at <address> */
if (!current) {
buf_set_u32(stm8->core_cache->reg_list[STM8_PC].value,
0, 32, address);
stm8->core_cache->reg_list[STM8_PC].dirty = true;
stm8->core_cache->reg_list[STM8_PC].valid = true;
}
if (!current)
resume_pc = address;
else
resume_pc = buf_get_u32(
stm8->core_cache->reg_list[STM8_PC].value,
0, 32);
stm8_restore_context(target);
/* the front-end may request us not to handle breakpoints */
if (handle_breakpoints) {
/* Single step past breakpoint at current address */
breakpoint = breakpoint_find(target, resume_pc);
if (breakpoint) {
LOG_DEBUG("unset breakpoint at " TARGET_ADDR_FMT,
breakpoint->address);
stm8_unset_breakpoint(target, breakpoint);
stm8_single_step_core(target);
stm8_set_breakpoint(target, breakpoint);
}
}
/* disable interrupts if we are debugging */
if (debug_execution)
stm8_enable_interrupts(target, 0);
/* exit debug mode */
stm8_exit_debug(target);
target->debug_reason = DBG_REASON_NOTHALTED;
/* registers are now invalid */
register_cache_invalidate(stm8->core_cache);
if (!debug_execution) {
target->state = TARGET_RUNNING;
target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
LOG_DEBUG("target resumed at 0x%" PRIx32 "", resume_pc);
} else {
target->state = TARGET_DEBUG_RUNNING;
target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
LOG_DEBUG("target debug resumed at 0x%" PRIx32 "", resume_pc);
}
return ERROR_OK;
}
static int stm8_init_flash_regs(bool enable_stm8l, struct stm8_common *stm8)
{
stm8->enable_stm8l = enable_stm8l;
if (stm8->enable_stm8l) {
stm8->flash_cr2 = FLASH_CR2_STM8L;
stm8->flash_ncr2 = FLASH_NCR2_STM8L;
stm8->flash_iapsr = FLASH_IAPSR_STM8L;
stm8->flash_dukr = FLASH_DUKR_STM8L;
stm8->flash_pukr = FLASH_PUKR_STM8L;
} else {
stm8->flash_cr2 = FLASH_CR2_STM8S;
stm8->flash_ncr2 = FLASH_NCR2_STM8S;
stm8->flash_iapsr = FLASH_IAPSR_STM8S;
stm8->flash_dukr = FLASH_DUKR_STM8S;
stm8->flash_pukr = FLASH_PUKR_STM8S;
}
return ERROR_OK;
}
static int stm8_init_arch_info(struct target *target,
struct stm8_common *stm8, struct jtag_tap *tap)
{
target->endianness = TARGET_BIG_ENDIAN;
target->arch_info = stm8;
stm8->common_magic = STM8_COMMON_MAGIC;
stm8->fast_data_area = NULL;
stm8->blocksize = 0x80;
stm8->flashstart = 0x8000;
stm8->flashend = 0xffff;
stm8->eepromstart = 0x4000;
stm8->eepromend = 0x43ff;
stm8->optionstart = 0x4800;
stm8->optionend = 0x487F;
/* has breakpoint/watchpoint unit been scanned */
stm8->bp_scanned = false;
stm8->hw_break_list = NULL;
stm8->read_core_reg = stm8_read_core_reg;
stm8->write_core_reg = stm8_write_core_reg;
stm8_init_flash_regs(0, stm8);
return ERROR_OK;
}
static int stm8_target_create(struct target *target,
Jim_Interp *interp)
{
struct stm8_common *stm8 = calloc(1, sizeof(struct stm8_common));
stm8_init_arch_info(target, stm8, target->tap);
stm8_configure_break_unit(target);
return ERROR_OK;
}
static int stm8_read_core_reg(struct target *target, unsigned int num)
{
uint32_t reg_value;
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
if (num >= STM8_NUM_REGS)
return ERROR_COMMAND_SYNTAX_ERROR;
reg_value = stm8->core_regs[num];
LOG_DEBUG("read core reg %i value 0x%" PRIx32 "", num , reg_value);
buf_set_u32(stm8->core_cache->reg_list[num].value, 0, 32, reg_value);
stm8->core_cache->reg_list[num].valid = true;
stm8->core_cache->reg_list[num].dirty = false;
return ERROR_OK;
}
static int stm8_write_core_reg(struct target *target, unsigned int num)
{
uint32_t reg_value;
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
if (num >= STM8_NUM_REGS)
return ERROR_COMMAND_SYNTAX_ERROR;
reg_value = buf_get_u32(stm8->core_cache->reg_list[num].value, 0, 32);
stm8->core_regs[num] = reg_value;
LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", num , reg_value);
stm8->core_cache->reg_list[num].valid = true;
stm8->core_cache->reg_list[num].dirty = false;
return ERROR_OK;
}
static const char *stm8_get_gdb_arch(struct target *target)
{
return "stm8";
}
static int stm8_get_gdb_reg_list(struct target *target, struct reg **reg_list[],
int *reg_list_size, enum target_register_class reg_class)
{
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
unsigned int i;
*reg_list_size = STM8_NUM_REGS;
*reg_list = malloc(sizeof(struct reg *) * (*reg_list_size));
for (i = 0; i < STM8_NUM_REGS; i++)
(*reg_list)[i] = &stm8->core_cache->reg_list[i];
return ERROR_OK;
}
static const struct reg_arch_type stm8_reg_type = {
.get = stm8_get_core_reg,
.set = stm8_set_core_reg,
};
static struct reg_cache *stm8_build_reg_cache(struct target *target)
{
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
int num_regs = STM8_NUM_REGS;
struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
struct reg_cache *cache = malloc(sizeof(struct reg_cache));
struct reg *reg_list = calloc(num_regs, sizeof(struct reg));
struct stm8_core_reg *arch_info = malloc(
sizeof(struct stm8_core_reg) * num_regs);
struct reg_feature *feature;
int i;
/* Build the process context cache */
cache->name = "stm8 registers";
cache->next = NULL;
cache->reg_list = reg_list;
cache->num_regs = num_regs;
(*cache_p) = cache;
stm8->core_cache = cache;
for (i = 0; i < num_regs; i++) {
arch_info[i].num = stm8_regs[i].id;
arch_info[i].target = target;
arch_info[i].stm8_common = stm8;
reg_list[i].name = stm8_regs[i].name;
reg_list[i].size = stm8_regs[i].bits;
reg_list[i].value = calloc(1, 4);
reg_list[i].valid = false;
reg_list[i].type = &stm8_reg_type;
reg_list[i].arch_info = &arch_info[i];
reg_list[i].reg_data_type = calloc(1, sizeof(struct reg_data_type));
if (reg_list[i].reg_data_type)
reg_list[i].reg_data_type->type = stm8_regs[i].type;
else {
LOG_ERROR("unable to allocate reg type list");
return NULL;
}
reg_list[i].dirty = false;
reg_list[i].group = stm8_regs[i].group;
reg_list[i].number = stm8_regs[i].id;
reg_list[i].exist = true;
reg_list[i].caller_save = true; /* gdb defaults to true */
feature = calloc(1, sizeof(struct reg_feature));
if (feature) {
feature->name = stm8_regs[i].feature;
reg_list[i].feature = feature;
} else
LOG_ERROR("unable to allocate feature list");
}
return cache;
}
static void stm8_free_reg_cache(struct target *target)
{
struct stm8_common *stm8 = target_to_stm8(target);
struct reg_cache *cache;
struct reg *reg;
unsigned int i;
cache = stm8->core_cache;
if (!cache)
return;
for (i = 0; i < cache->num_regs; i++) {
reg = &cache->reg_list[i];
free(reg->feature);
free(reg->reg_data_type);
free(reg->value);
}
free(cache->reg_list[0].arch_info);
free(cache->reg_list);
free(cache);
stm8->core_cache = NULL;
}
static void stm8_deinit(struct target *target)
{
struct stm8_common *stm8 = target_to_stm8(target);
free(stm8->hw_break_list);
stm8_free_reg_cache(target);
free(stm8);
}
static int stm8_arch_state(struct target *target)
{
struct stm8_common *stm8 = target_to_stm8(target);
LOG_USER("target halted due to %s, pc: 0x%8.8" PRIx32 "",
debug_reason_name(target),
buf_get_u32(stm8->core_cache->reg_list[STM8_PC].value, 0, 32));
return ERROR_OK;
}
static int stm8_step(struct target *target, int current,
target_addr_t address, int handle_breakpoints)
{
LOG_DEBUG("%" PRIx32 " " TARGET_ADDR_FMT " %" PRIx32,
current, address, handle_breakpoints);
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
struct breakpoint *breakpoint = NULL;
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* current = 1: continue on current pc, otherwise continue at <address> */
if (!current) {
buf_set_u32(stm8->core_cache->reg_list[STM8_PC].value, 0, 32, address);
stm8->core_cache->reg_list[STM8_PC].dirty = true;
stm8->core_cache->reg_list[STM8_PC].valid = true;
}
/* the front-end may request us not to handle breakpoints */
if (handle_breakpoints) {
breakpoint = breakpoint_find(target,
buf_get_u32(stm8->core_cache->reg_list[STM8_PC].value, 0, 32));
if (breakpoint)
stm8_unset_breakpoint(target, breakpoint);
}
/* restore context */
stm8_restore_context(target);
/* configure single step mode */
stm8_config_step(target, 1);
target->debug_reason = DBG_REASON_SINGLESTEP;
target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
/* disable interrupts while stepping */
if (!stm8->enable_step_irq)
stm8_enable_interrupts(target, 0);
/* exit debug mode */
stm8_exit_debug(target);
/* registers are now invalid */
register_cache_invalidate(stm8->core_cache);
LOG_DEBUG("target stepped ");
stm8_debug_entry(target);
if (breakpoint)
stm8_set_breakpoint(target, breakpoint);
target_call_event_callbacks(target, TARGET_EVENT_HALTED);
return ERROR_OK;
}
static void stm8_enable_breakpoints(struct target *target)
{
struct breakpoint *breakpoint = target->breakpoints;
/* set any pending breakpoints */
while (breakpoint) {
if (breakpoint->set == 0)
stm8_set_breakpoint(target, breakpoint);
breakpoint = breakpoint->next;
}
}
static int stm8_set_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
struct stm8_common *stm8 = target_to_stm8(target);
struct stm8_comparator *comparator_list = stm8->hw_break_list;
int retval;
if (breakpoint->set) {
LOG_WARNING("breakpoint already set");
return ERROR_OK;
}
if (breakpoint->type == BKPT_HARD) {
int bp_num = 0;
while (comparator_list[bp_num].used && (bp_num < stm8->num_hw_bpoints))
bp_num++;
if (bp_num >= stm8->num_hw_bpoints) {
LOG_ERROR("Can not find free breakpoint register (bpid: %" PRIu32 ")",
breakpoint->unique_id);
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
breakpoint->set = bp_num + 1;
comparator_list[bp_num].used = true;
comparator_list[bp_num].bp_value = breakpoint->address;
comparator_list[bp_num].type = HWBRK_EXEC;
retval = stm8_set_hwbreak(target, comparator_list);
if (retval != ERROR_OK)
return retval;
LOG_DEBUG("bpid: %" PRIu32 ", bp_num %i bp_value 0x%" PRIx32 "",
breakpoint->unique_id,
bp_num, comparator_list[bp_num].bp_value);
} else if (breakpoint->type == BKPT_SOFT) {
LOG_DEBUG("bpid: %" PRIu32, breakpoint->unique_id);
if (breakpoint->length == 1) {
uint8_t verify = 0x55;
retval = target_read_u8(target, breakpoint->address,
breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
retval = target_write_u8(target, breakpoint->address, STM8_BREAK);
if (retval != ERROR_OK)
return retval;
retval = target_read_u8(target, breakpoint->address, &verify);
if (retval != ERROR_OK)
return retval;
if (verify != STM8_BREAK) {
LOG_ERROR("Unable to set breakpoint at address " TARGET_ADDR_FMT
" - check that memory is read/writable",
breakpoint->address);
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
} else {
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
breakpoint->set = 1; /* Any nice value but 0 */
}
return ERROR_OK;
}
static int stm8_add_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
struct stm8_common *stm8 = target_to_stm8(target);
int ret;
if (breakpoint->type == BKPT_HARD) {
if (stm8->num_hw_bpoints_avail < 1) {
LOG_INFO("no hardware breakpoint available");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
ret = stm8_set_breakpoint(target, breakpoint);
if (ret != ERROR_OK)
return ret;
stm8->num_hw_bpoints_avail--;
return ERROR_OK;
}
ret = stm8_set_breakpoint(target, breakpoint);
if (ret != ERROR_OK)
return ret;
return ERROR_OK;
}
static int stm8_unset_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
struct stm8_comparator *comparator_list = stm8->hw_break_list;
int retval;
if (!breakpoint->set) {
LOG_WARNING("breakpoint not set");
return ERROR_OK;
}
if (breakpoint->type == BKPT_HARD) {
int bp_num = breakpoint->set - 1;
if ((bp_num < 0) || (bp_num >= stm8->num_hw_bpoints)) {
LOG_DEBUG("Invalid comparator number in breakpoint (bpid: %" PRIu32 ")",
breakpoint->unique_id);
return ERROR_OK;
}
LOG_DEBUG("bpid: %" PRIu32 " - releasing hw: %d",
breakpoint->unique_id,
bp_num);
comparator_list[bp_num].used = false;
retval = stm8_set_hwbreak(target, comparator_list);
if (retval != ERROR_OK)
return retval;
} else {
/* restore original instruction (kept in target endianness) */
LOG_DEBUG("bpid: %" PRIu32, breakpoint->unique_id);
if (breakpoint->length == 1) {
uint8_t current_instr;
/* check that user program has not
modified breakpoint instruction */
retval = target_read_memory(target, breakpoint->address, 1, 1,
(uint8_t *)&current_instr);
if (retval != ERROR_OK)
return retval;
if (current_instr == STM8_BREAK) {
retval = target_write_memory(target, breakpoint->address, 1, 1,
breakpoint->orig_instr);
if (retval != ERROR_OK)
return retval;
}
} else
return ERROR_FAIL;
}
breakpoint->set = 0;
return ERROR_OK;
}
static int stm8_remove_breakpoint(struct target *target,
struct breakpoint *breakpoint)
{
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (breakpoint->set)
stm8_unset_breakpoint(target, breakpoint);
if (breakpoint->type == BKPT_HARD)
stm8->num_hw_bpoints_avail++;
return ERROR_OK;
}
static int stm8_set_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
struct stm8_common *stm8 = target_to_stm8(target);
struct stm8_comparator *comparator_list = stm8->hw_break_list;
int wp_num = 0;
int ret;
if (watchpoint->set) {
LOG_WARNING("watchpoint already set");
return ERROR_OK;
}
while (comparator_list[wp_num].used && (wp_num < stm8->num_hw_bpoints))
wp_num++;
if (wp_num >= stm8->num_hw_bpoints) {
LOG_ERROR("Can not find free hw breakpoint");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
if (watchpoint->length != 1) {
LOG_ERROR("Only watchpoints of length 1 are supported");
return ERROR_TARGET_UNALIGNED_ACCESS;
}
enum hw_break_type enable = 0;
switch (watchpoint->rw) {
case WPT_READ:
enable = HWBRK_RD;
break;
case WPT_WRITE:
enable = HWBRK_WR;
break;
case WPT_ACCESS:
enable = HWBRK_ACC;
break;
default:
LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
}
comparator_list[wp_num].used = true;
comparator_list[wp_num].bp_value = watchpoint->address;
comparator_list[wp_num].type = enable;
ret = stm8_set_hwbreak(target, comparator_list);
if (ret != ERROR_OK) {
comparator_list[wp_num].used = false;
return ret;
}
watchpoint->set = wp_num + 1;
LOG_DEBUG("wp_num %i bp_value 0x%" PRIx32 "",
wp_num,
comparator_list[wp_num].bp_value);
return ERROR_OK;
}
static int stm8_add_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
int ret;
struct stm8_common *stm8 = target_to_stm8(target);
if (stm8->num_hw_bpoints_avail < 1) {
LOG_INFO("no hardware watchpoints available");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
ret = stm8_set_watchpoint(target, watchpoint);
if (ret != ERROR_OK)
return ret;
stm8->num_hw_bpoints_avail--;
return ERROR_OK;
}
static void stm8_enable_watchpoints(struct target *target)
{
struct watchpoint *watchpoint = target->watchpoints;
/* set any pending watchpoints */
while (watchpoint) {
if (watchpoint->set == 0)
stm8_set_watchpoint(target, watchpoint);
watchpoint = watchpoint->next;
}
}
static int stm8_unset_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
struct stm8_comparator *comparator_list = stm8->hw_break_list;
if (!watchpoint->set) {
LOG_WARNING("watchpoint not set");
return ERROR_OK;
}
int wp_num = watchpoint->set - 1;
if ((wp_num < 0) || (wp_num >= stm8->num_hw_bpoints)) {
LOG_DEBUG("Invalid hw comparator number in watchpoint");
return ERROR_OK;
}
comparator_list[wp_num].used = false;
watchpoint->set = 0;
stm8_set_hwbreak(target, comparator_list);
return ERROR_OK;
}
static int stm8_remove_watchpoint(struct target *target,
struct watchpoint *watchpoint)
{
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (watchpoint->set)
stm8_unset_watchpoint(target, watchpoint);
stm8->num_hw_bpoints_avail++;
return ERROR_OK;
}
static int stm8_examine(struct target *target)
{
int retval;
uint8_t csr1, csr2;
/* get pointers to arch-specific information */
struct stm8_common *stm8 = target_to_stm8(target);
enum reset_types jtag_reset_config = jtag_get_reset_config();
if (!target_was_examined(target)) {
if (!stm8->swim_configured) {
/* set SWIM_CSR = 0xa0 (enable mem access & mask reset) */
LOG_DEBUG("writing A0 to SWIM_CSR (SAFE_MASK + SWIM_DM)");
retval = stm8_write_u8(target, SWIM_CSR, SAFE_MASK + SWIM_DM);
if (retval != ERROR_OK)
return retval;
/* set high speed */
LOG_DEBUG("writing B0 to SWIM_CSR (SAFE_MASK + SWIM_DM + HS)");
retval = stm8_write_u8(target, SWIM_CSR, SAFE_MASK + SWIM_DM + HS);
if (retval != ERROR_OK)
return retval;
jtag_config_khz(SWIM_FREQ_HIGH);
stm8->swim_configured = true;
/*
Now is the time to deassert reset if connect_under_reset.
Releasing reset line will cause the option bytes to load.
The core will still be stalled.
*/
if (jtag_reset_config & RESET_CNCT_UNDER_SRST) {
if (jtag_reset_config & RESET_SRST_NO_GATING)
stm8_reset_deassert(target);
else
LOG_WARNING("\'srst_nogate\' reset_config option is required");
}
} else {
LOG_INFO("trying to reconnect");
retval = swim_reconnect();
if (retval != ERROR_OK) {
LOG_ERROR("reconnect failed");
return ERROR_FAIL;
}
/* read dm_csrx control regs */
retval = stm8_read_dm_csrx(target, &csr1, &csr2);
if (retval != ERROR_OK) {
LOG_ERROR("state query failed");
return ERROR_FAIL;
}
}
target_set_examined(target);
return ERROR_OK;
}
return ERROR_OK;
}
/** Checks whether a memory region is erased. */
static int stm8_blank_check_memory(struct target *target,
struct target_memory_check_block *blocks, int num_blocks, uint8_t erased_value)
{
struct working_area *erase_check_algorithm;
struct reg_param reg_params[2];
struct mem_param mem_params[2];
struct stm8_algorithm stm8_info;
static const uint8_t stm8_erase_check_code[] = {
#include "../../contrib/loaders/erase_check/stm8_erase_check.inc"
};
if (erased_value != 0xff) {
LOG_ERROR("Erase value 0x%02" PRIx8 " not yet supported for STM8",
erased_value);
return ERROR_FAIL;
}
/* make sure we have a working area */
if (target_alloc_working_area(target, sizeof(stm8_erase_check_code),
&erase_check_algorithm) != ERROR_OK)
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
target_write_buffer(target, erase_check_algorithm->address,
sizeof(stm8_erase_check_code), stm8_erase_check_code);
stm8_info.common_magic = STM8_COMMON_MAGIC;
init_mem_param(&mem_params[0], 0x0, 3, PARAM_OUT);
buf_set_u32(mem_params[0].value, 0, 24, blocks[0].address);
init_mem_param(&mem_params[1], 0x3, 3, PARAM_OUT);
buf_set_u32(mem_params[1].value, 0, 24, blocks[0].size);
init_reg_param(&reg_params[0], "a", 32, PARAM_IN_OUT);
buf_set_u32(reg_params[0].value, 0, 32, erased_value);
init_reg_param(&reg_params[1], "sp", 32, PARAM_OUT);
buf_set_u32(reg_params[1].value, 0, 32, erase_check_algorithm->address);
int retval = target_run_algorithm(target, 2, mem_params, 2, reg_params,
erase_check_algorithm->address + 6,
erase_check_algorithm->address + (sizeof(stm8_erase_check_code) - 1),
10000, &stm8_info);
if (retval == ERROR_OK)
blocks[0].result = (*(reg_params[0].value) == 0xff);
destroy_mem_param(&mem_params[0]);
destroy_mem_param(&mem_params[1]);
destroy_reg_param(&reg_params[0]);
destroy_reg_param(&reg_params[1]);
target_free_working_area(target, erase_check_algorithm);
if (retval != ERROR_OK)
return retval;
return 1; /* only one block has been checked */
}
static int stm8_checksum_memory(struct target *target, target_addr_t address,
uint32_t count, uint32_t *checksum)
{
/* let image_calculate_checksum() take care of business */
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
/* run to exit point. return error if exit point was not reached. */
static int stm8_run_and_wait(struct target *target, uint32_t entry_point,
int timeout_ms, uint32_t exit_point, struct stm8_common *stm8)
{
uint32_t pc;
int retval;
/* This code relies on the target specific resume() and
poll()->debug_entry() sequence to write register values to the
processor and the read them back */
retval = target_resume(target, 0, entry_point, 0, 1);
if (retval != ERROR_OK)
return retval;
retval = target_wait_state(target, TARGET_HALTED, timeout_ms);
/* If the target fails to halt due to the breakpoint, force a halt */
if (retval != ERROR_OK || target->state != TARGET_HALTED) {
retval = target_halt(target);
if (retval != ERROR_OK)
return retval;
retval = target_wait_state(target, TARGET_HALTED, 500);
if (retval != ERROR_OK)
return retval;
return ERROR_TARGET_TIMEOUT;
}
pc = buf_get_u32(stm8->core_cache->reg_list[STM8_PC].value, 0, 32);
if (exit_point && (pc != exit_point)) {
LOG_DEBUG("failed algorithm halted at 0x%" PRIx32 " ", pc);
return ERROR_TARGET_TIMEOUT;
}
return ERROR_OK;
}
static int stm8_run_algorithm(struct target *target, int num_mem_params,
struct mem_param *mem_params, int num_reg_params,
struct reg_param *reg_params, target_addr_t entry_point,
target_addr_t exit_point, int timeout_ms, void *arch_info)
{
struct stm8_common *stm8 = target_to_stm8(target);
uint32_t context[STM8_NUM_REGS];
int retval = ERROR_OK;
LOG_DEBUG("Running algorithm");
/* NOTE: stm8_run_algorithm requires that each
algorithm uses a software breakpoint
at the exit point */
if (stm8->common_magic != STM8_COMMON_MAGIC) {
LOG_ERROR("current target isn't a STM8 target");
return ERROR_TARGET_INVALID;
}
if (target->state != TARGET_HALTED) {
LOG_WARNING("target not halted");
return ERROR_TARGET_NOT_HALTED;
}
/* refresh core register cache */
for (unsigned int i = 0; i < STM8_NUM_REGS; i++) {
if (!stm8->core_cache->reg_list[i].valid)
stm8->read_core_reg(target, i);
context[i] = buf_get_u32(stm8->core_cache->reg_list[i].value, 0, 32);
}
for (int i = 0; i < num_mem_params; i++) {
if (mem_params[i].direction == PARAM_IN)
continue;
retval = target_write_buffer(target, mem_params[i].address,
mem_params[i].size, mem_params[i].value);
if (retval != ERROR_OK)
return retval;
}
for (int i = 0; i < num_reg_params; i++) {
if (reg_params[i].direction == PARAM_IN)
continue;
struct reg *reg = register_get_by_name(stm8->core_cache,
reg_params[i].reg_name, 0);
if (!reg) {
LOG_ERROR("BUG: register '%s' not found", reg_params[i].reg_name);
return ERROR_COMMAND_SYNTAX_ERROR;
}
if (reg_params[i].size != 32) {
LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
reg_params[i].reg_name);
return ERROR_COMMAND_SYNTAX_ERROR;
}
stm8_set_core_reg(reg, reg_params[i].value);
}
retval = stm8_run_and_wait(target, entry_point,
timeout_ms, exit_point, stm8);
if (retval != ERROR_OK)
return retval;
for (int i = 0; i < num_mem_params; i++) {
if (mem_params[i].direction != PARAM_OUT) {
retval = target_read_buffer(target, mem_params[i].address,
mem_params[i].size, mem_params[i].value);
if (retval != ERROR_OK)
return retval;
}
}
for (int i = 0; i < num_reg_params; i++) {
if (reg_params[i].direction != PARAM_OUT) {
struct reg *reg = register_get_by_name(stm8->core_cache,
reg_params[i].reg_name, 0);
if (!reg) {
LOG_ERROR("BUG: register '%s' not found",
reg_params[i].reg_name);
return ERROR_COMMAND_SYNTAX_ERROR;
}
if (reg_params[i].size != 32) {
LOG_ERROR("BUG: register '%s' size doesn't match reg_params[i].size",
reg_params[i].reg_name);
return ERROR_COMMAND_SYNTAX_ERROR;
}
buf_set_u32(reg_params[i].value,
0, 32, buf_get_u32(reg->value, 0, 32));
}
}
/* restore everything we saved before */
for (unsigned int i = 0; i < STM8_NUM_REGS; i++) {
uint32_t regvalue;
regvalue = buf_get_u32(stm8->core_cache->reg_list[i].value, 0, 32);
if (regvalue != context[i]) {
LOG_DEBUG("restoring register %s with value 0x%8.8" PRIx32,
stm8->core_cache->reg_list[i].name, context[i]);
buf_set_u32(stm8->core_cache->reg_list[i].value,
0, 32, context[i]);
stm8->core_cache->reg_list[i].valid = true;
stm8->core_cache->reg_list[i].dirty = true;
}
}
return ERROR_OK;
}
int stm8_jim_configure(struct target *target, Jim_GetOptInfo *goi)
{
struct stm8_common *stm8 = target_to_stm8(target);
jim_wide w;
int e;
const char *arg;
arg = Jim_GetString(goi->argv[0], NULL);
if (!strcmp(arg, "-blocksize")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
if (goi->argc == 0) {
Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv,
"-blocksize ?bytes? ...");
return JIM_ERR;
}
e = Jim_GetOpt_Wide(goi, &w);
if (e != JIM_OK)
return e;
stm8->blocksize = w;
LOG_DEBUG("blocksize=%8.8x", stm8->blocksize);
return JIM_OK;
}
if (!strcmp(arg, "-flashstart")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
if (goi->argc == 0) {
Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv,
"-flashstart ?address? ...");
return JIM_ERR;
}
e = Jim_GetOpt_Wide(goi, &w);
if (e != JIM_OK)
return e;
stm8->flashstart = w;
LOG_DEBUG("flashstart=%8.8x", stm8->flashstart);
return JIM_OK;
}
if (!strcmp(arg, "-flashend")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
if (goi->argc == 0) {
Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv,
"-flashend ?address? ...");
return JIM_ERR;
}
e = Jim_GetOpt_Wide(goi, &w);
if (e != JIM_OK)
return e;
stm8->flashend = w;
LOG_DEBUG("flashend=%8.8x", stm8->flashend);
return JIM_OK;
}
if (!strcmp(arg, "-eepromstart")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
if (goi->argc == 0) {
Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv,
"-eepromstart ?address? ...");
return JIM_ERR;
}
e = Jim_GetOpt_Wide(goi, &w);
if (e != JIM_OK)
return e;
stm8->eepromstart = w;
LOG_DEBUG("eepromstart=%8.8x", stm8->eepromstart);
return JIM_OK;
}
if (!strcmp(arg, "-eepromend")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
if (goi->argc == 0) {
Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv,
"-eepromend ?address? ...");
return JIM_ERR;
}
e = Jim_GetOpt_Wide(goi, &w);
if (e != JIM_OK)
return e;
stm8->eepromend = w;
LOG_DEBUG("eepromend=%8.8x", stm8->eepromend);
return JIM_OK;
}
if (!strcmp(arg, "-optionstart")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
if (goi->argc == 0) {
Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv,
"-optionstart ?address? ...");
return JIM_ERR;
}
e = Jim_GetOpt_Wide(goi, &w);
if (e != JIM_OK)
return e;
stm8->optionstart = w;
LOG_DEBUG("optionstart=%8.8x", stm8->optionstart);
return JIM_OK;
}
if (!strcmp(arg, "-optionend")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
if (goi->argc == 0) {
Jim_WrongNumArgs(goi->interp, goi->argc, goi->argv,
"-optionend ?address? ...");
return JIM_ERR;
}
e = Jim_GetOpt_Wide(goi, &w);
if (e != JIM_OK)
return e;
stm8->optionend = w;
LOG_DEBUG("optionend=%8.8x", stm8->optionend);
return JIM_OK;
}
if (!strcmp(arg, "-enable_step_irq")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
stm8->enable_step_irq = true;
LOG_DEBUG("enable_step_irq=%8.8x", stm8->enable_step_irq);
return JIM_OK;
}
if (!strcmp(arg, "-enable_stm8l")) {
e = Jim_GetOpt_String(goi, &arg, NULL);
if (e != JIM_OK)
return e;
stm8->enable_stm8l = true;
LOG_DEBUG("enable_stm8l=%8.8x", stm8->enable_stm8l);
stm8_init_flash_regs(stm8->enable_stm8l, stm8);
return JIM_OK;
}
return JIM_CONTINUE;
}
COMMAND_HANDLER(stm8_handle_enable_step_irq_command)
{
const char *msg;
struct target *target = get_current_target(CMD_CTX);
struct stm8_common *stm8 = target_to_stm8(target);
bool enable = stm8->enable_step_irq;
if (CMD_ARGC > 0) {
COMMAND_PARSE_ENABLE(CMD_ARGV[0], enable);
stm8->enable_step_irq = enable;
}
msg = stm8->enable_step_irq ? "enabled" : "disabled";
command_print(CMD, "enable_step_irq = %s", msg);
return ERROR_OK;
}
COMMAND_HANDLER(stm8_handle_enable_stm8l_command)
{
const char *msg;
struct target *target = get_current_target(CMD_CTX);
struct stm8_common *stm8 = target_to_stm8(target);
bool enable = stm8->enable_stm8l;
if (CMD_ARGC > 0) {
COMMAND_PARSE_ENABLE(CMD_ARGV[0], enable);
stm8->enable_stm8l = enable;
}
msg = stm8->enable_stm8l ? "enabled" : "disabled";
command_print(CMD, "enable_stm8l = %s", msg);
stm8_init_flash_regs(stm8->enable_stm8l, stm8);
return ERROR_OK;
}
static const struct command_registration stm8_exec_command_handlers[] = {
{
.name = "enable_step_irq",
.handler = stm8_handle_enable_step_irq_command,
.mode = COMMAND_ANY,
.help = "Enable/disable irq handling during step",
.usage = "[1/0]",
},
{
.name = "enable_stm8l",
.handler = stm8_handle_enable_stm8l_command,
.mode = COMMAND_ANY,
.help = "Enable/disable STM8L flash programming",
.usage = "[1/0]",
},
COMMAND_REGISTRATION_DONE
};
const struct command_registration stm8_command_handlers[] = {
{
.name = "stm8",
.mode = COMMAND_ANY,
.help = "stm8 command group",
.usage = "",
.chain = stm8_exec_command_handlers,
},
COMMAND_REGISTRATION_DONE
};
struct target_type stm8_target = {
.name = "stm8",
.poll = stm8_poll,
.arch_state = stm8_arch_state,
.halt = stm8_halt,
.resume = stm8_resume,
.step = stm8_step,
.assert_reset = stm8_reset_assert,
.deassert_reset = stm8_reset_deassert,
.get_gdb_arch = stm8_get_gdb_arch,
.get_gdb_reg_list = stm8_get_gdb_reg_list,
.read_memory = stm8_read_memory,
.write_memory = stm8_write_memory,
.checksum_memory = stm8_checksum_memory,
.blank_check_memory = stm8_blank_check_memory,
.run_algorithm = stm8_run_algorithm,
.add_breakpoint = stm8_add_breakpoint,
.remove_breakpoint = stm8_remove_breakpoint,
.add_watchpoint = stm8_add_watchpoint,
.remove_watchpoint = stm8_remove_watchpoint,
.commands = stm8_command_handlers,
.target_create = stm8_target_create,
.init_target = stm8_init,
.examine = stm8_examine,
.deinit_target = stm8_deinit,
.target_jim_configure = stm8_jim_configure,
};
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