esp-idf/components/esp_gdbstub/esp_common/gdbstub_common.c

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2021-04-15 03:52:09 -04:00
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "soc/uart_periph.h"
#include "soc/gpio_periph.h"
#include "esp_gdbstub_common.h"
#include "sdkconfig.h"
#include "hal/uart_ll.h"
#define UART_NUM CONFIG_ESP_CONSOLE_UART_NUM
static uart_dev_t *gdb_uart = NULL;
void esp_gdbstub_target_init(void)
{
switch (UART_NUM) {
case 0:
gdb_uart = &UART0;
break;
#if SOC_UART_NUM > 1
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case 1:
gdb_uart = &UART1;
break;
#endif
#if SOC_UART_NUM > 2
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case 2:
gdb_uart = &UART2;
break;
#endif
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default:
gdb_uart = &UART0;
break;
}
}
int esp_gdbstub_getchar(void)
{
if (gdb_uart == NULL) {
esp_gdbstub_target_init();
}
unsigned char data;
while (uart_ll_get_rxfifo_len(gdb_uart) == 0) {
}
uart_ll_read_rxfifo(gdb_uart, &data, 1);
return data;
}
void esp_gdbstub_putchar(int c)
{
if (gdb_uart == NULL) {
esp_gdbstub_target_init();
}
while (uart_ll_get_txfifo_len(gdb_uart) <= 126) {
}
uart_ll_write_txfifo(gdb_uart, (uint8_t *)&c, 1);
}
void esp_gdbstub_flush()
{
//not needed for uart
}
int esp_gdbstub_getfifo()
{
if (gdb_uart == NULL) {
esp_gdbstub_target_init();
}
int doDebug = 0;
int fifolen = uart_ll_get_rxfifo_len(gdb_uart);
while (fifolen != 0) {
unsigned char data;
uart_ll_read_rxfifo(gdb_uart, &data, 1);
if (data == 0x3) {
doDebug = 1; //Check if any of the chars is Ctrl+C. Throw away rest.
}
if (data == '+') {
doDebug = 1; //Check if any of the chars is '+'. Throw away rest.
}
fifolen--;
}
uart_ll_clr_intsts_mask(gdb_uart, UART_INTR_RXFIFO_FULL | UART_INTR_RXFIFO_TOUT);
return doDebug;
}
int esp_gdbstub_readmem(intptr_t addr)
{
if (addr < 0x20000000 || addr >= 0x80000000) {
/* see cpu_configure_region_protection */
return -1;
}
uint32_t val_aligned = *(uint32_t *)(addr & (~3));
uint32_t shift = (addr & 3) * 8;
return (val_aligned >> shift) & 0xff;
}
int esp_gdbstub_writemem(unsigned int addr, unsigned char data)
{
if (addr < 0x20000000 || addr >= 0x80000000) {
/* see cpu_configure_region_protection */
return -1;
}
int *i = (int *)(addr & (~3));
if ((addr & 3) == 0) {
*i = (*i & 0xffffff00) | (data << 0);
}
if ((addr & 3) == 1) {
*i = (*i & 0xffff00ff) | (data << 8);
}
if ((addr & 3) == 2) {
*i = (*i & 0xff00ffff) | (data << 16);
}
if ((addr & 3) == 3) {
*i = (*i & 0x00ffffff) | (data << 24);
}
asm volatile("ISYNC\nISYNC\n");
return 0;
}