c22e572ad0
1. Add Kconfig options to control task listing support. 2. Convert magic values (-1, -2) to named constants. 3. Convert spaces to tabs to match the rest of the file. 4. Rename getAllTasksHandle to getTaskInfo to reflect its purpose. 5. Add some curly braces for single line statements.
558 lines
16 KiB
C
558 lines
16 KiB
C
// Copyright 2015-2016 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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// 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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/******************************************************************************
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* Description: A stub to make the ESP32 debuggable by GDB over the serial
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* port, at least enough to do a backtrace on panic. This gdbstub is read-only:
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* it allows inspecting the ESP32 state
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*******************************************************************************/
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#include <string.h>
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#include "rom/ets_sys.h"
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#include "soc/uart_reg.h"
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#include "soc/io_mux_reg.h"
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#include "esp_gdbstub.h"
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#include "esp_panic.h"
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#include "driver/gpio.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "sdkconfig.h"
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//Length of buffer used to reserve GDB commands. Has to be at least able to fit the G command, which
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//implies a minimum size of about 320 bytes.
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#define PBUFLEN 512
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static unsigned char cmd[PBUFLEN]; //GDB command input buffer
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static char chsum; //Running checksum of the output packet
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#define ATTR_GDBFN
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//Receive a char from the uart. Uses polling and feeds the watchdog.
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static int ATTR_GDBFN gdbRecvChar() {
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int i;
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while (((READ_PERI_REG(UART_STATUS_REG(0))>>UART_RXFIFO_CNT_S)&UART_RXFIFO_CNT)==0) ;
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i=READ_PERI_REG(UART_FIFO_REG(0));
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return i;
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}
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//Send a char to the uart.
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static void ATTR_GDBFN gdbSendChar(char c) {
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while (((READ_PERI_REG(UART_STATUS_REG(0))>>UART_TXFIFO_CNT_S)&UART_TXFIFO_CNT)>=126) ;
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WRITE_PERI_REG(UART_FIFO_REG(0), c);
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}
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//Send the start of a packet; reset checksum calculation.
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static void ATTR_GDBFN gdbPacketStart() {
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chsum=0;
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gdbSendChar('$');
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}
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//Send a char as part of a packet
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static void ATTR_GDBFN gdbPacketChar(char c) {
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if (c=='#' || c=='$' || c=='}' || c=='*') {
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gdbSendChar('}');
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gdbSendChar(c^0x20);
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chsum+=(c^0x20)+'}';
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} else {
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gdbSendChar(c);
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chsum+=c;
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}
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}
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//Send a string as part of a packet
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static void ATTR_GDBFN gdbPacketStr(const char *c) {
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while (*c!=0) {
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gdbPacketChar(*c);
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c++;
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}
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}
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//Send a hex val as part of a packet. 'bits'/4 dictates the number of hex chars sent.
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static void ATTR_GDBFN gdbPacketHex(int val, int bits) {
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char hexChars[]="0123456789abcdef";
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int i;
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for (i=bits; i>0; i-=4) {
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gdbPacketChar(hexChars[(val>>(i-4))&0xf]);
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}
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}
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//Finish sending a packet.
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static void ATTR_GDBFN gdbPacketEnd() {
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gdbSendChar('#');
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gdbPacketHex(chsum, 8);
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}
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//Error states used by the routines that grab stuff from the incoming gdb packet
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#define ST_ENDPACKET -1
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#define ST_ERR -2
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#define ST_OK -3
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#define ST_CONT -4
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//Grab a hex value from the gdb packet. Ptr will get positioned on the end
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//of the hex string, as far as the routine has read into it. Bits/4 indicates
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//the max amount of hex chars it gobbles up. Bits can be -1 to eat up as much
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//hex chars as possible.
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static long ATTR_GDBFN gdbGetHexVal(unsigned char **ptr, int bits) {
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int i;
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int no;
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unsigned int v=0;
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char c;
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no=bits/4;
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if (bits==-1) no=64;
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for (i=0; i<no; i++) {
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c=**ptr;
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(*ptr)++;
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if (c>='0' && c<='9') {
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v<<=4;
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v|=(c-'0');
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} else if (c>='A' && c<='F') {
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v<<=4;
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v|=(c-'A')+10;
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} else if (c>='a' && c<='f') {
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v<<=4;
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v|=(c-'a')+10;
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} else if (c=='#') {
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if (bits==-1) {
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(*ptr)--;
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return v;
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}
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return ST_ENDPACKET;
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} else {
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if (bits==-1) {
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(*ptr)--;
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return v;
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}
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return ST_ERR;
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}
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}
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return v;
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}
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//Swap an int into the form gdb wants it
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static int ATTR_GDBFN iswap(int i) {
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int r;
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r=((i>>24)&0xff);
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r|=((i>>16)&0xff)<<8;
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r|=((i>>8)&0xff)<<16;
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r|=((i>>0)&0xff)<<24;
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return r;
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}
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//Read a byte from ESP32 memory.
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static unsigned char ATTR_GDBFN readbyte(unsigned int p) {
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int *i=(int*)(p&(~3));
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if (p<0x20000000 || p>=0x80000000) return -1;
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return *i>>((p&3)*8);
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}
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//Register file in the format exp108 gdb port expects it.
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//Inspired by gdb/regformats/reg-xtensa.dat
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typedef struct {
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uint32_t pc;
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uint32_t a[64];
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uint32_t lbeg;
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uint32_t lend;
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uint32_t lcount;
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uint32_t sar;
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uint32_t windowbase;
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uint32_t windowstart;
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uint32_t configid0;
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uint32_t configid1;
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uint32_t ps;
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uint32_t threadptr;
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uint32_t br;
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uint32_t scompare1;
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uint32_t acclo;
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uint32_t acchi;
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uint32_t m0;
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uint32_t m1;
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uint32_t m2;
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uint32_t m3;
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uint32_t expstate; //I'm going to assume this is exccause...
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uint32_t f64r_lo;
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uint32_t f64r_hi;
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uint32_t f64s;
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uint32_t f[16];
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uint32_t fcr;
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uint32_t fsr;
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} GdbRegFile;
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GdbRegFile gdbRegFile;
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/*
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//Register format as the Xtensa HAL has it:
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STRUCT_FIELD (long, 4, XT_STK_EXIT, exit)
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STRUCT_FIELD (long, 4, XT_STK_PC, pc)
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STRUCT_FIELD (long, 4, XT_STK_PS, ps)
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STRUCT_FIELD (long, 4, XT_STK_A0, a0)
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[..]
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STRUCT_FIELD (long, 4, XT_STK_A15, a15)
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STRUCT_FIELD (long, 4, XT_STK_SAR, sar)
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STRUCT_FIELD (long, 4, XT_STK_EXCCAUSE, exccause)
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STRUCT_FIELD (long, 4, XT_STK_EXCVADDR, excvaddr)
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STRUCT_FIELD (long, 4, XT_STK_LBEG, lbeg)
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STRUCT_FIELD (long, 4, XT_STK_LEND, lend)
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STRUCT_FIELD (long, 4, XT_STK_LCOUNT, lcount)
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// Temporary space for saving stuff during window spill
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STRUCT_FIELD (long, 4, XT_STK_TMP0, tmp0)
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STRUCT_FIELD (long, 4, XT_STK_TMP1, tmp1)
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STRUCT_FIELD (long, 4, XT_STK_TMP2, tmp2)
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STRUCT_FIELD (long, 4, XT_STK_VPRI, vpri)
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STRUCT_FIELD (long, 4, XT_STK_OVLY, ovly)
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#endif
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STRUCT_END(XtExcFrame)
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*/
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static void commonRegfile() {
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if (gdbRegFile.a[0] & 0x8000000U) gdbRegFile.a[0] = (gdbRegFile.a[0] & 0x3fffffffU) | 0x40000000U;
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if (!esp_stack_ptr_is_sane(gdbRegFile.a[1])) gdbRegFile.a[1] = 0xDEADBEEF;
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gdbRegFile.windowbase=0; //0
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gdbRegFile.windowstart=0x1; //1
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gdbRegFile.configid0=0xdeadbeef; //ToDo
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gdbRegFile.configid1=0xdeadbeef; //ToDo
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gdbRegFile.threadptr=0xdeadbeef; //ToDo
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gdbRegFile.br=0xdeadbeef; //ToDo
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gdbRegFile.scompare1=0xdeadbeef; //ToDo
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gdbRegFile.acclo=0xdeadbeef; //ToDo
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gdbRegFile.acchi=0xdeadbeef; //ToDo
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gdbRegFile.m0=0xdeadbeef; //ToDo
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gdbRegFile.m1=0xdeadbeef; //ToDo
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gdbRegFile.m2=0xdeadbeef; //ToDo
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gdbRegFile.m3=0xdeadbeef; //ToDo
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}
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static void dumpHwToRegfile(XtExcFrame *frame) {
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int i;
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long *frameAregs=&frame->a0;
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gdbRegFile.pc=(frame->pc & 0x3fffffffU)|0x40000000U;
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for (i=0; i<16; i++) gdbRegFile.a[i]=frameAregs[i];
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for (i=16; i<64; i++) gdbRegFile.a[i]=0xDEADBEEF;
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gdbRegFile.lbeg=frame->lbeg;
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gdbRegFile.lend=frame->lend;
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gdbRegFile.lcount=frame->lcount;
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gdbRegFile.ps=(frame->ps & PS_UM) ? (frame->ps & ~PS_EXCM) : frame->ps;
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//All windows have been spilled to the stack by the ISR routines. The following values should indicate that.
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gdbRegFile.sar=frame->sar;
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commonRegfile();
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gdbRegFile.expstate=frame->exccause; //ToDo
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}
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//Send the reason execution is stopped to GDB.
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static void sendReason() {
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//exception-to-signal mapping
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char exceptionSignal[]={4,31,11,11,2,6,8,0,6,7,0,0,7,7,7,7};
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int i=0;
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gdbPacketStart();
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gdbPacketChar('T');
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i=gdbRegFile.expstate&0x7f;
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if (i<sizeof(exceptionSignal)) {
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gdbPacketHex(exceptionSignal[i], 8);
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} else {
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gdbPacketHex(11, 8);
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}
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gdbPacketEnd();
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}
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static int sendPacket(const char * text) {
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gdbPacketStart();
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if (text != NULL) gdbPacketStr(text);
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gdbPacketEnd();
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return ST_OK;
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}
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#if CONFIG_GDBSTUB_SUPPORT_TASKS
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#define STUB_TASKS_NUM CONFIG_GDBSTUB_MAX_TASKS
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//Remember the exception frame that caused panic since it's not saved in TCB
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static XtExcFrame paniced_frame;
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//Allows GDBStub to disable task support after a crash
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//(e.g. if GDBStub crashes while trying to get task list, e.g. due to corrupted list structures)
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static enum {
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HANDLER_NOT_STARTED,
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HANDLER_STARTED,
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HANDLER_TASK_SUPPORT_DISABLED
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} handlerState;
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static void dumpTaskToRegfile(XtSolFrame *frame) {
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int i;
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long *frameAregs=&frame->a0;
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gdbRegFile.pc=(frame->pc & 0x3fffffffU)|0x40000000U;
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for (i=0; i<4; i++) gdbRegFile.a[i]=frameAregs[i];
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for (i=4; i<64; i++) gdbRegFile.a[i]=0xDEADBEEF;
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gdbRegFile.lbeg=0;
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gdbRegFile.lend=0;
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gdbRegFile.lcount=0;
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gdbRegFile.ps=(frame->ps & PS_UM) ? (frame->ps & ~PS_EXCM) : frame->ps;
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//All windows have been spilled to the stack by the ISR routines. The following values should indicate that.
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gdbRegFile.sar=0;
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commonRegfile();
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gdbRegFile.expstate=0; //ToDo
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}
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// Fetch the task status. Returns the total number of tasks.
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static unsigned getTaskInfo(unsigned index, unsigned * handle, const char ** name, unsigned * coreId) {
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static unsigned taskCount = 0;
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static TaskSnapshot_t tasks[STUB_TASKS_NUM];
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if (!taskCount) {
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unsigned tcbSize = 0;
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taskCount = uxTaskGetSnapshotAll(tasks, STUB_TASKS_NUM, &tcbSize);
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}
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if (index < taskCount) {
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TaskHandle_t h = (TaskHandle_t)tasks[index].pxTCB;
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if (handle) *handle = (unsigned)h;
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if (name) *name = pcTaskGetTaskName(h);
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if (coreId) *coreId = xTaskGetAffinity(h);
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}
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return taskCount;
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}
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typedef struct
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{
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uint8_t * topOfStack;
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} DumpTCB;
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static void dumpTCBToRegFile(unsigned handle) {
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// A task handle is a pointer to a TCB in FreeRTOS
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DumpTCB * tcb = (DumpTCB*)handle;
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uint8_t * pxTopOfStack = tcb->topOfStack;
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//Deduced from coredump code
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XtExcFrame * frame = (XtExcFrame*)pxTopOfStack;
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if (frame->exit) {
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// It's an exception frame
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dumpHwToRegfile(frame);
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} else {
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XtSolFrame * taskFrame = (XtSolFrame*)pxTopOfStack;
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dumpTaskToRegfile(taskFrame);
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}
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}
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#define CUR_TASK_INDEX_NOT_SET -2
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#define CUR_TASK_INDEX_UNKNOWN -1
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// Get the index of the task currently running on the current CPU, and cache the result
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static int findCurrentTaskIndex() {
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static int curTaskIndex = CUR_TASK_INDEX_NOT_SET;
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if (curTaskIndex == CUR_TASK_INDEX_NOT_SET) {
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unsigned curHandle = (unsigned)xTaskGetCurrentTaskHandleForCPU(xPortGetCoreID());
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unsigned handle;
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unsigned count = getTaskInfo(0, 0, 0, 0);
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for(int k=0; k<(int)count; k++) {
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if (getTaskInfo(k, &handle, 0, 0) && curHandle == handle) {
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curTaskIndex = k;
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return curTaskIndex;
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}
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}
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curTaskIndex = CUR_TASK_INDEX_UNKNOWN;
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}
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return curTaskIndex;
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}
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#endif // CONFIG_GDBSTUB_SUPPORT_TASKS
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//Handle a command as received from GDB.
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static int gdbHandleCommand(unsigned char *cmd, int len) {
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//Handle a command
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int i, j, k;
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unsigned char *data=cmd+1;
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if (cmd[0]=='g') { //send all registers to gdb
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int *p=(int*)&gdbRegFile;
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gdbPacketStart();
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for (i=0; i<sizeof(GdbRegFile)/4; i++) gdbPacketHex(iswap(*p++), 32);
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gdbPacketEnd();
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} else if (cmd[0]=='G') { //receive content for all registers from gdb
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int *p=(int*)&gdbRegFile;
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for (i=0; i<sizeof(GdbRegFile)/4; i++) *p++=iswap(gdbGetHexVal(&data, 32));
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sendPacket("OK");
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} else if (cmd[0]=='m') { //read memory to gdb
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i=gdbGetHexVal(&data, -1);
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data++;
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j=gdbGetHexVal(&data, -1);
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gdbPacketStart();
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for (k=0; k<j; k++) {
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gdbPacketHex(readbyte(i++), 8);
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}
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gdbPacketEnd();
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} else if (cmd[0]=='?') { //Reply with stop reason
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sendReason();
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#if CONFIG_GDBSTUB_SUPPORT_TASKS
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} else if (handlerState != HANDLER_TASK_SUPPORT_DISABLED) {
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if (cmd[0]=='H') { //Continue with task
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if (cmd[1]=='g' || cmd[1]=='c') {
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const char * ret = "OK";
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data++;
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i=gdbGetHexVal(&data, -1);
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handlerState = HANDLER_STARTED; //Hg0 is the first packet received after connect
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j = findCurrentTaskIndex();
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if (i == j || (j == CUR_TASK_INDEX_UNKNOWN && i == 0)) {
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//GDB has asked us for the current task on this CPU.
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//This task either was executing when we have entered the panic handler,
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//or was already switched out and we have paniced during the context switch.
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//Either way we are interested in the stack frame where panic has happened,
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//so obtain the state from the exception frame rather than the TCB.
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dumpHwToRegfile(&paniced_frame);
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} else {
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unsigned handle, count;
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//Get the handle for that task
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count = getTaskInfo(i, &handle, 0, 0);
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//Then extract TCB and gdbRegFile from it
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if (i < count) dumpTCBToRegFile(handle);
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else ret = "E00";
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}
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return sendPacket(ret);
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}
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return sendPacket(NULL);
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} else if (cmd[0]=='T') { //Task alive check
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unsigned count;
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data++;
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i=gdbGetHexVal(&data, -1);
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count = getTaskInfo(i, 0, 0, 0);
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return sendPacket(i < count ? "OK": "E00");
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} else if (cmd[0]=='q') { //Extended query
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// React to qThreadExtraInfo or qfThreadInfo or qsThreadInfo or qC, without using strcmp
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if (len > 16 && cmd[1] == 'T' && cmd[2] == 'h' && cmd[3] == 'r' && cmd[7] == 'E' && cmd[12] == 'I' && cmd[16] == ',') {
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data=&cmd[17];
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i=gdbGetHexVal(&data, -1);
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unsigned handle = 0, coreId = 3;
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const char * name = 0;
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// Extract the task name and CPU from freeRTOS
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unsigned tCount = getTaskInfo(i, &handle, &name, &coreId);
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if (i < tCount) {
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gdbPacketStart();
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for(k=0; name[k]; k++) gdbPacketHex(name[k], 8);
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gdbPacketStr("20435055"); // CPU
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gdbPacketStr(coreId == 0 ? "30": coreId == 1 ? "31" : "78"); // 0 or 1 or x
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gdbPacketEnd();
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return ST_OK;
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}
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} else if (len >= 12 && (cmd[1] == 'f' || cmd[1] == 's') && (cmd[2] == 'T' && cmd[3] == 'h' && cmd[4] == 'r' && cmd[5] == 'e' && cmd[6] == 'a' && cmd[7] == 'd' && cmd[8] == 'I')) {
|
|
// Only react to qfThreadInfo and qsThreadInfo, not using strcmp here since it can be in ROM
|
|
// Extract the number of task from freeRTOS
|
|
static int taskIndex = 0;
|
|
unsigned tCount = 0;
|
|
if (cmd[1] == 'f') {
|
|
taskIndex = 0;
|
|
handlerState = HANDLER_STARTED; //It seems it's the first request GDB is sending
|
|
}
|
|
tCount = getTaskInfo(0, 0, 0, 0);
|
|
if (taskIndex < tCount) {
|
|
gdbPacketStart();
|
|
gdbPacketStr("m");
|
|
gdbPacketHex(taskIndex, 32);
|
|
gdbPacketEnd();
|
|
taskIndex++;
|
|
} else return sendPacket("l");
|
|
} else if (len >= 2 && cmd[1] == 'C') {
|
|
// Get current task id
|
|
gdbPacketStart();
|
|
k = findCurrentTaskIndex();
|
|
if (k != CUR_TASK_INDEX_UNKNOWN) {
|
|
gdbPacketStr("QC");
|
|
gdbPacketHex(k, 32);
|
|
} else gdbPacketStr("bad");
|
|
gdbPacketEnd();
|
|
return ST_OK;
|
|
}
|
|
return sendPacket(NULL);
|
|
}
|
|
#endif // CONFIG_GDBSTUB_SUPPORT_TASKS
|
|
} else {
|
|
//We don't recognize or support whatever GDB just sent us.
|
|
return sendPacket(NULL);
|
|
}
|
|
return ST_OK;
|
|
}
|
|
|
|
|
|
//Lower layer: grab a command packet and check the checksum
|
|
//Calls gdbHandleCommand on the packet if the checksum is OK
|
|
//Returns ST_OK on success, ST_ERR when checksum fails, a
|
|
//character if it is received instead of the GDB packet
|
|
//start char.
|
|
static int gdbReadCommand() {
|
|
unsigned char c;
|
|
unsigned char chsum=0, rchsum;
|
|
unsigned char sentchs[2];
|
|
int p=0;
|
|
unsigned char *ptr;
|
|
c=gdbRecvChar();
|
|
if (c!='$') return c;
|
|
while(1) {
|
|
c=gdbRecvChar();
|
|
if (c=='#') { //end of packet, checksum follows
|
|
cmd[p]=0;
|
|
break;
|
|
}
|
|
chsum+=c;
|
|
if (c=='$') {
|
|
//Wut, restart packet?
|
|
chsum=0;
|
|
p=0;
|
|
continue;
|
|
}
|
|
if (c=='}') { //escape the next char
|
|
c=gdbRecvChar();
|
|
chsum+=c;
|
|
c^=0x20;
|
|
}
|
|
cmd[p++]=c;
|
|
if (p>=PBUFLEN) return ST_ERR;
|
|
}
|
|
//A # has been received. Get and check the received chsum.
|
|
sentchs[0]=gdbRecvChar();
|
|
sentchs[1]=gdbRecvChar();
|
|
ptr=&sentchs[0];
|
|
rchsum=gdbGetHexVal(&ptr, 8);
|
|
if (rchsum!=chsum) {
|
|
gdbSendChar('-');
|
|
return ST_ERR;
|
|
} else {
|
|
gdbSendChar('+');
|
|
return gdbHandleCommand(cmd, p);
|
|
}
|
|
}
|
|
|
|
|
|
void esp_gdbstub_panic_handler(XtExcFrame *frame) {
|
|
#if CONFIG_GDBSTUB_SUPPORT_TASKS
|
|
if (handlerState == HANDLER_STARTED) {
|
|
//We have re-entered GDB Stub. Try disabling task support.
|
|
handlerState = HANDLER_TASK_SUPPORT_DISABLED;
|
|
gdbPacketEnd(); // Ends up any pending GDB packet (this creates a garbage value)
|
|
} else if (handlerState == HANDLER_NOT_STARTED) {
|
|
//Need to remember the frame that panic'd since gdb will ask for all threads before ours
|
|
memcpy(&paniced_frame, frame, sizeof(paniced_frame));
|
|
dumpHwToRegfile(&paniced_frame);
|
|
}
|
|
#else // CONFIG_GDBSTUB_SUPPORT_TASKS
|
|
dumpHwToRegfile(frame);
|
|
#endif // CONFIG_GDBSTUB_SUPPORT_TASKS
|
|
|
|
//Make sure txd/rxd are enabled
|
|
gpio_pullup_dis(1);
|
|
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD_U0RXD);
|
|
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD_U0TXD);
|
|
|
|
sendReason();
|
|
while(gdbReadCommand()!=ST_CONT);
|
|
while(1);
|
|
}
|