esp-idf/components/esp_gdbstub/esp32c2/gdbstub_esp32c2.c

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/*
2022-01-17 21:32:56 -05:00
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "soc/uart_periph.h"
#include "soc/gpio_periph.h"
#include "soc/soc.h"
#include "esp_gdbstub_common.h"
#include "sdkconfig.h"
#define UART_NUM CONFIG_ESP_CONSOLE_UART_NUM
#define GDBSTUB_MEM_REGION_COUNT 9
#define UART_REG_FIELD_LEN 0x84
typedef struct {
intptr_t lower;
intptr_t upper;
} mem_bound_t;
static const mem_bound_t mem_region_table [GDBSTUB_MEM_REGION_COUNT] =
{
{SOC_DROM_LOW, SOC_DROM_HIGH},
{SOC_IROM_LOW, SOC_IROM_HIGH},
{SOC_IRAM_LOW, SOC_IRAM_HIGH},
{SOC_DRAM_LOW, SOC_DRAM_HIGH},
{SOC_IROM_MASK_LOW, SOC_IROM_MASK_HIGH},
{SOC_DROM_MASK_LOW, SOC_DROM_MASK_HIGH},
// We shouldn't read the uart registers since it will disturb the debugging via UART,
// so skip UART part of the peripheral registers.
{DR_REG_UART_BASE + UART_REG_FIELD_LEN, SOC_PERIPHERAL_HIGH},
{SOC_DEBUG_LOW, SOC_DEBUG_HIGH},
};
static inline bool check_inside_valid_region(intptr_t addr)
{
for (size_t i = 0; i < GDBSTUB_MEM_REGION_COUNT; i++) {
if (addr >= mem_region_table[i].lower && addr < mem_region_table[i].upper) {
return true;
}
}
return false;
}
void esp_gdbstub_target_init()
{
}
//assume UART gdbstub channel
int esp_gdbstub_getchar()
{
while (REG_GET_FIELD(UART_STATUS_REG(UART_NUM), UART_RXFIFO_CNT) == 0) {
;
}
return REG_READ(UART_FIFO_AHB_REG(UART_NUM));
}
void esp_gdbstub_putchar(int c)
{
while (REG_GET_FIELD(UART_STATUS_REG(UART_NUM), UART_TXFIFO_CNT) >= 126) {
;
}
REG_WRITE(UART_FIFO_AHB_REG(UART_NUM), c);
}
void esp_gdbstub_flush()
{
//not needed for uart
}
int esp_gdbstub_readmem(intptr_t addr)
{
if (!check_inside_valid_region(addr)) {
/* see esp_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;
}
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int esp_gdbstub_writemem(unsigned int addr, unsigned char data)
{
if (!check_inside_valid_region(addr)) {
/* see esp_cpu_configure_region_protection */
return -1;
}
/* 'addr' may be pointing at the memory which does not allow for
* byte access, such as IRAM.
* Perform a word-aligned read-modify-write, instead of writing
* the byte directly.
*/
unsigned *addr_aligned = (unsigned *)(addr & (~3));
const uint32_t bit_offset = (addr & 0x3) * 8;
const uint32_t mask = ~(0xff << bit_offset);
*addr_aligned = (*addr_aligned & mask) | (data << bit_offset);
return 0;
}