mirror of
https://github.com/espressif/esp-idf.git
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346 lines
11 KiB
C
346 lines
11 KiB
C
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include "esp_gdbstub.h"
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#include "esp_gdbstub_common.h"
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#include "sdkconfig.h"
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#ifdef CONFIG_ESP_GDBSTUB_SUPPORT_TASKS
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static void init_task_info(void);
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static void find_paniced_task_index(void);
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static int handle_task_commands(unsigned char *cmd, int len);
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#endif
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static void send_reason(void);
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static esp_gdbstub_scratch_t s_scratch;
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void esp_gdbstub_panic_handler(esp_gdbstub_frame_t *frame)
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{
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#ifndef CONFIG_ESP_GDBSTUB_SUPPORT_TASKS
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esp_gdbstub_frame_to_regfile(frame, &s_scratch.regfile);
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#else
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if (s_scratch.state == GDBSTUB_STARTED) {
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/* We have re-entered GDB Stub. Try disabling task support. */
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s_scratch.state = GDBSTUB_TASK_SUPPORT_DISABLED;
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/* Flush any pending GDB packet (this creates a garbage value) */
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esp_gdbstub_send_end();
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} else if (s_scratch.state == GDBSTUB_NOT_STARTED) {
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s_scratch.state = GDBSTUB_STARTED;
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/* Save the paniced frame and get the list of tasks */
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memcpy(&s_scratch.paniced_frame, frame, sizeof(*frame));
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esp_gdbstub_frame_to_regfile(frame, &s_scratch.regfile);
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init_task_info();
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find_paniced_task_index();
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/* Current task is the paniced task */
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if (s_scratch.paniced_task_index == GDBSTUB_CUR_TASK_INDEX_UNKNOWN) {
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s_scratch.current_task_index = 0;
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}
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}
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#endif // CONFIG_ESP_GDBSTUB_SUPPORT_TASKS
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esp_gdbstub_target_init();
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s_scratch.signal = esp_gdbstub_get_signal(frame);
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send_reason();
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while (true) {
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unsigned char *cmd;
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size_t size;
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int res = esp_gdbstub_read_command(&cmd, &size);
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if (res > 0) {
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/* character received instead of a command */
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continue;
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}
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if (res == GDBSTUB_ST_ERR) {
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esp_gdbstub_send_str_packet("E01");
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continue;
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}
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res = esp_gdbstub_handle_command(cmd, size);
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if (res == GDBSTUB_ST_ERR) {
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esp_gdbstub_send_str_packet(NULL);
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}
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}
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}
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static void send_reason(void)
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{
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esp_gdbstub_send_start();
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esp_gdbstub_send_char('T');
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esp_gdbstub_send_hex(s_scratch.signal, 8);
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esp_gdbstub_send_end();
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}
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static uint32_t gdbstub_hton(uint32_t i)
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{
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return __builtin_bswap32(i);
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}
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/** Send all registers to gdb */
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static void handle_g_command(const unsigned char* cmd, int len)
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{
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uint32_t *p = (uint32_t *) &s_scratch.regfile;
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esp_gdbstub_send_start();
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for (int i = 0; i < sizeof(s_scratch.regfile) / sizeof(*p); ++i) {
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esp_gdbstub_send_hex(gdbstub_hton(*p++), 32);
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}
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esp_gdbstub_send_end();
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}
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/** Receive register values from gdb */
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static void handle_G_command(const unsigned char* cmd, int len)
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{
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uint32_t *p = (uint32_t *) &s_scratch.regfile;
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for (int i = 0; i < sizeof(s_scratch.regfile) / sizeof(*p); ++i) {
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*p++ = gdbstub_hton(esp_gdbstub_gethex(&cmd, 32));
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}
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esp_gdbstub_send_str_packet("OK");
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}
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/** Read memory to gdb */
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static void handle_m_command(const unsigned char* cmd, int len)
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{
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intptr_t addr = (intptr_t) esp_gdbstub_gethex(&cmd, -1);
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cmd++;
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uint32_t size = esp_gdbstub_gethex(&cmd, -1);
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if (esp_gdbstub_readmem(addr) < 0 || esp_gdbstub_readmem(addr + size - 1) < 0) {
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esp_gdbstub_send_str_packet("E01");
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return;
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}
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esp_gdbstub_send_start();
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for (int i = 0; i < size; ++i) {
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int b = esp_gdbstub_readmem(addr++);
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esp_gdbstub_send_hex(b, 8);
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}
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esp_gdbstub_send_end();
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}
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/** Handle a command received from gdb */
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int esp_gdbstub_handle_command(unsigned char *cmd, int len)
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{
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unsigned char *data = cmd + 1;
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if (cmd[0] == 'g')
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{
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handle_g_command(data, len - 1);
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} else if (cmd[0] == 'G') {
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/* receive content for all registers from gdb */
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handle_G_command(data, len - 1);
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} else if (cmd[0] == 'm') {
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/* read memory to gdb */
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handle_m_command(data, len - 1);
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} else if (cmd[0] == '?') {
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/* Reply with stop reason */
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send_reason();
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#if CONFIG_ESP_GDBSTUB_SUPPORT_TASKS
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} else if (s_scratch.state != GDBSTUB_TASK_SUPPORT_DISABLED) {
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return handle_task_commands(cmd, len);
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#endif // CONFIG_ESP_GDBSTUB_SUPPORT_TASKS
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} else {
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/* Unrecognized command */
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return GDBSTUB_ST_ERR;
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}
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return GDBSTUB_ST_OK;
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}
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/* Everything below is related to the support for listing FreeRTOS tasks as threads in GDB */
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#ifdef CONFIG_ESP_GDBSTUB_SUPPORT_TASKS
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static void init_task_info(void)
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{
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unsigned tcb_size;
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s_scratch.task_count = uxTaskGetSnapshotAll(s_scratch.tasks, GDBSTUB_TASKS_NUM, &tcb_size);
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}
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static bool get_task_handle(size_t index, TaskHandle_t *handle)
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{
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if (index >= s_scratch.task_count) {
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return false;
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}
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*handle = (TaskHandle_t) s_scratch.tasks[index].pxTCB;
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return true;
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}
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/** Get the index of the task running on the current CPU, and save the result */
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static void find_paniced_task_index(void)
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{
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TaskHandle_t cur_handle = xTaskGetCurrentTaskHandleForCPU(xPortGetCoreID());
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TaskHandle_t handle;
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for (int i = 0; i < s_scratch.task_count; i++) {
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if (get_task_handle(i, &handle) && cur_handle == handle) {
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s_scratch.paniced_task_index = i;
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return;
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}
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}
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s_scratch.paniced_task_index = GDBSTUB_CUR_TASK_INDEX_UNKNOWN;
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}
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/** H command sets the "current task" for the purpose of further commands */
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static void handle_H_command(const unsigned char* cmd, int len)
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{
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if (cmd[1] == 'g' || cmd[1] == 'c') {
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const char *ret = "OK";
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cmd += 2;
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int requested_task_index = esp_gdbstub_gethex(&cmd, -1);
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if (requested_task_index == s_scratch.paniced_task_index ||
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(requested_task_index == 0 && s_scratch.current_task_index == GDBSTUB_CUR_TASK_INDEX_UNKNOWN)) {
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/* Get the registers of the paniced task */
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esp_gdbstub_frame_to_regfile(&s_scratch.paniced_frame, &s_scratch.regfile);
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} else if (requested_task_index > s_scratch.task_count) {
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ret = "E00";
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} else {
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TaskHandle_t handle = NULL;
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get_task_handle(requested_task_index, &handle);
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/* FIXME: for the task currently running on the other CPU, extracting the registers from TCB
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* isn't valid. Need to use some IPC mechanism to obtain the registers of the other CPU
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*/
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if (handle != NULL) {
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esp_gdbstub_tcb_to_regfile(handle, &s_scratch.regfile);
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}
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}
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esp_gdbstub_send_str_packet(ret);
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} else {
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esp_gdbstub_send_str_packet(NULL);
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}
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}
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/** qC returns the current thread ID */
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static void handle_qC_command(const unsigned char* cmd, int len)
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{
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esp_gdbstub_send_start();
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esp_gdbstub_send_str("QC");
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esp_gdbstub_send_hex(s_scratch.current_task_index, 32);
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esp_gdbstub_send_end();
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}
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/** T command checks if the task is alive.
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* Since GDB isn't going to ask about the tasks which haven't been listed by q*ThreadInfo,
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* and the state of tasks can not change (no stepping allowed), simply return "OK" here.
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*/
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static void handle_T_command(const unsigned char* cmd, int len)
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{
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esp_gdbstub_send_str_packet("OK");
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}
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/** qfThreadInfo requests the start of the thread list, qsThreadInfo (below) is repeated to
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* get the subsequent threads.
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*/
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static void handle_qfThreadInfo_command(const unsigned char* cmd, int len)
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{
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/* The first task in qfThreadInfo reply is going to be the one which GDB will request to stop.
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* Therefore it has to be the paniced task.
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* Reply with the paniced task index, and later skip over this index while handling qsThreadInfo
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*/
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esp_gdbstub_send_start();
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esp_gdbstub_send_str("m");
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esp_gdbstub_send_hex(s_scratch.paniced_task_index, 32);
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esp_gdbstub_send_end();
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s_scratch.thread_info_index = 0;
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}
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static void handle_qsThreadInfo_command(const unsigned char* cmd, int len)
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{
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int next_task_index = ++s_scratch.thread_info_index;
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if (next_task_index == s_scratch.task_count) {
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/* No more tasks */
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esp_gdbstub_send_str_packet("l");
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return;
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}
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if (next_task_index == s_scratch.paniced_task_index) {
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/* Have already sent this one in the reply to qfThreadInfo, skip over it */
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handle_qsThreadInfo_command(cmd, len);
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return;
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}
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esp_gdbstub_send_start();
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esp_gdbstub_send_str("m");
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esp_gdbstub_send_hex(next_task_index, 32);
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esp_gdbstub_send_end();
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}
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/** qThreadExtraInfo requests the thread name */
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static void handle_qThreadExtraInfo_command(const unsigned char* cmd, int len)
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{
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cmd += sizeof("qThreadExtraInfo,") - 1;
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int task_index = esp_gdbstub_gethex(&cmd, -1);
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TaskHandle_t handle;
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if (!get_task_handle(task_index, &handle)) {
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esp_gdbstub_send_str_packet("E01");
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return;
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}
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esp_gdbstub_send_start();
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const char* task_name = pcTaskGetTaskName(handle);
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while (*task_name) {
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esp_gdbstub_send_hex(*task_name, 8);
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task_name++;
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}
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/** TODO: add "Running" or "Suspended" and "CPU0" or "CPU1" */
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esp_gdbstub_send_end();
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}
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bool command_name_matches(const char* pattern, const unsigned char* ucmd, int len)
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{
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const char* cmd = (const char*) ucmd;
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const char* end = cmd + len;
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for (; *pattern && cmd < end; ++cmd, ++pattern) {
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if (*pattern == '?') {
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continue;
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}
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if (*pattern != *cmd) {
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return false;
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}
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}
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return *pattern == 0 && (cmd == end || *cmd == ',');
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}
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/** Handle all the thread-related commands */
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static int handle_task_commands(unsigned char *cmd, int len)
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{
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if (cmd[0] == 'H') {
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/* Continue with task */
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handle_H_command(cmd, len);
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} else if (cmd[0] == 'T') {
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/* Task alive check */
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handle_T_command(cmd, len);
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} else if (cmd[0] == 'q') {
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if (command_name_matches("qfThreadInfo", cmd, len)) {
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handle_qfThreadInfo_command(cmd, len);
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} else if (command_name_matches("qsThreadInfo", cmd, len)) {
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handle_qsThreadInfo_command(cmd, len);
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} else if (command_name_matches("qC", cmd, len)) {
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handle_qC_command(cmd, len);
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} else if (command_name_matches("qThreadExtraInfo", cmd, len)) {
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handle_qThreadExtraInfo_command(cmd, len);
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} else {
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/* Unrecognized command */
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return GDBSTUB_ST_ERR;
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}
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} else {
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/* Unrecognized command */
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return GDBSTUB_ST_ERR;
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}
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return GDBSTUB_ST_OK;
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}
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#endif // CONFIG_ESP_GDBSTUB_SUPPORT_TASKS
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