Game & Watch: Super Mario Bros.

gdb debug game-and-watch-retro-go

---

參考資料：
1. gnu-toolchains
2. game-and-watch-retro-go
3. game-and-watch-flashloader

步驟如下：
1. 連接ST-LINK V2燒錄器到SWD腳位
2. 執行如下命令

$ sudo apt-get install gdb-multiarch -y
$ ln -s /usr/bin/gdb-multiarch /usr/bin/arm-none-eabi-gdb

$ cd
$ wget https://developer.arm.com/-/media/Files/downloads/gnu-rm/10-2020q4/gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
$ tar xvf gcc-arm-none-eabi-10-2020-q4-major-x86_64-linux.tar.bz2
$ sudo mv gcc-arm-none-eabi-10-2020-q4-major /opt
$ export PATH=/opt/gcc-arm-none-eabi-10-2020-q4-major/bin:$PATH

$ cd
$ git clone --recurse-submodules https://github.com/kbeckmann/game-and-watch-retro-go
$ cd game-and-watch-retro-go
$ make -j8 flash

$ vim main.cfg
  source [find interface/stlink.cfg]
  adapter speed 500
  transport select hla_swd
  source [find target/stm32h7x.cfg]
  reset_config none

$ openocd -f main.cfg -c "init; program build/gw_retro_go.elf; halt;"
  Open On-Chip Debugger 0.11.0-rc1+dev-00010-gc69b4deae-dirty (2020-12-27-01:20)
  Licensed under GNU GPL v2
  For bug reports, read
    http://openocd.org/doc/doxygen/bugs.html
  Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
  none separate

  Info : clock speed 1800 kHz
  Info : STLINK V2J17S4 (API v2) VID:PID 0483:3748
  Info : Target voltage: 3.198428
  Info : stm32h7x.cpu0: hardware has 8 breakpoints, 4 watchpoints
  Info : starting gdb server for stm32h7x.cpu0 on 3333
  Info : Listening on port 3333 for gdb connections
  target halted due to debug-request, current mode: Thread
  xPSR: 0x01000000 pc: 0x0800c180 msp: 0x20020000
  ** Programming Started **
  Info : Device: STM32H7Ax/7Bx
  Info : STM32H7 flash has dual banks
  Info : Bank (0) size is 1024 kb, base address is 0x08000000
  Info : Padding image section 1 at 0x0800faf4 with 12 bytes (bank write end alignment)
  Warn : Adding extra erase range, 0x0800fb00 .. 0x0800ffff
  Warn : no flash bank found for address 0x90000000
  Warn : no flash bank found for address 0x90000278
  Warn : no flash bank found for address 0x9008c000
  ** Programming Finished **
  Info : Listening on port 6666 for tcl connections
  Info : Listening on port 4444 for telnet connections

接著開啟另一個視窗並且輸入如下指令

$ arm-none-eabi-gdb build/gw_retro_go.elf
  GNU gdb (Debian 8.2.1-2+b3) 8.2.1
  Copyright (C) 2018 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later 
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.
  Type "show copying" and "show warranty" for details.
  This GDB was configured as "x86_64-linux-gnu".
  Type "show configuration" for configuration details.
  For bug reporting instructions, please see:
  <http://www.gnu.org/software/gdb/bugs/>.
  Find the GDB manual and other documentation resources online at:
      <http://www.gnu.org/software/gdb/documentation/>.

  For help, type "help".
  Type "apropos word" to search for commands related to "word"...
  Reading symbols from build/gw_retro_go.elf...done.

(gdb) target remote :3333
  Remote debugging using :3333
  Reset_Handler () at startup_stm32h7b0xx.s:62
  62	  ldr   sp, =_estack      /* set stack pointer */

(gdb) b main
  Breakpoint 1 at 0x800156c: file Core/Src/main.c, line 359.

(gdb) c
  Continuing.
  Note: automatically using hardware breakpoints for read-only addresses.

  Breakpoint 1, main () at Core/Src/main.c:359
  359	  for(int i = 0; i < 1000000; i++) {

(gdb) list
  354	int main(void)
  355	{
  356	  /* USER CODE BEGIN 1 */
  357	  uint8_t trigger_wdt_bsod = 0;
  358
  359	  for(int i = 0; i < 1000000; i++) {
  360	    __NOP();
  361	  }
  362
  363	  // Nullpointer redzone

(gdb)

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