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Difference between revisions of "VSCode Cortex-Debugging"

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[[image:vscode-cortex-debug-views.png|center|750px]]
 
[[image:vscode-cortex-debug-views.png|center|750px]]
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=== Debug Commands ===
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There are the usual debug commands (continue, stepping, restart) plus a run and debug toolbar
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[[image:vscode-cortex-debug-toolbar.png|center]]
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==== Assembly Stepping ====
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Press CTRL+SHIFT+P to invoke command palette. Then Select Cortex-Debug:View Disassembly(Functon), type the function name you want to disassemble.
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<syntaxhighlight lang="asm" line start="1">
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0x000002ac: 80 b5          push {r7, lr}
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0x000002ae: 00 af          add r7, sp, #0
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0x000002b0: 0e 4b          ldr r3, [pc, #56] ; (0x2ec <main+64>)
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0x000002b2: 1b 68          ldr r3, [r3, #0]
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0x000002b4: 0d 4a          ldr r2, [pc, #52] ; (0x2ec <main+64>)
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0x000002b6: 43 f0 20 03    orr.w r3, r3, #32
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0x000002ba: 13 60          str r3, [r2, #0]
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0x000002bc: 0c 4b          ldr r3, [pc, #48] ; (0x2f0 <main+68>)
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0x000002be: 0e 22          movs r2, #14
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0x000002c0: 1a 60          str r2, [r3, #0]
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0x000002c2: 0c 4b          ldr r3, [pc, #48] ; (0x2f4 <main+72>)
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0x000002c4: 0e 22          movs r2, #14
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0x000002c6: 1a 60          str r2, [r3, #0]
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0x000002c8: 0b 4b          ldr r3, [pc, #44] ; (0x2f8 <main+76>)
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0x000002ca: 0e 22          movs r2, #14
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0x000002cc: 1a 60          str r2, [r3, #0]
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0x000002ce: 4f f4 fa 70    mov.w r0, #500 ; 0x1f4
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0x000002d2: 00 f0 13 f8    bl 0x2fc <delayMs>
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0x000002d6: 08 4b          ldr r3, [pc, #32] ; (0x2f8 <main+76>)
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0x000002d8: 1b 68          ldr r3, [r3, #0]
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0x000002da: 07 4a          ldr r2, [pc, #28] ; (0x2f8 <main+76>)
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0x000002dc: 03 f0 f1 03    and.w r3, r3, #241 ; 0xf1
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0x000002e0: 13 60          str r3, [r2, #0]
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0x000002e2: 4f f4 fa 70    mov.w r0, #500 ; 0x1f4
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0x000002e6: 00 f0 09 f8    bl 0x2fc <delayMs>
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0x000002ea: ed e7          b.n 0x2c8 <main+28>
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0x000002ec: 08 e1          b.n 0x500
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0x000002ee: 0f 40          ands r7, r1
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0x000002f0: 00 54          strb r0, [r0, r0]
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0x000002f2: 02 40          ands r2, r0
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0x000002f4: 1c 55          strb r4, [r3, r4]
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0x000002f6: 02 40          ands r2, r0
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0x000002f8: fc 53          strh r4, [r7, r7]
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0x000002fa: 02 40          ands r2, r0
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</syntaxhighlight>

Revision as of 15:28, 27 March 2022

VSCode Cortex Debugging

Use F5 or the menu Run > Start Debugging to start a debug session:

Vscode-cortex-debug-run-menu.png

This starts debug session. In case of troubles, check the Debug Console: 

Reading symbols from arm-none-eabi-objdump.exe --syms -C -h -w E:\tm4c123gxl\blinky/build/blinky.elf
Reading symbols from arm-none-eabi-nm.exe --defined-only -S -l -C -p E:\tm4c123gxl\blinky/build/blinky.elf
Launching GDB: arm-none-eabi-gdb.exe -q --interpreter=mi2 "E:\\tm4c123gxl\\blinky/build/blinky.elf"
    Set "showDevDebugOutput": true in your "launch.json" to see verbose GDB transactions here. Helpful to debug issues or report problems
Launching gdb-server: openocd.exe -c "gdb_port 50000" -c "tcl_port 50001" -c "telnet_port 50002" -s "E:\\tm4c123gxl\\blinky" -f "c:/Users/shankarappa/.vscode/extensions/marus25.cortex-debug-1.4.0/support/openocd-helpers.tcl" -f board/ek-tm4c123gxl.cfg
    Please check TERMINAL tab (gdb-server) for output from openocd.exe
Finished reading symbols from objdump: Time: 843 ms
Finished reading symbols from nm: Time: 313 ms
C:\ProgramData\chocolatey\lib\gcc-arm-embedded\tools\gcc-arm-none-eabi-10-2020-q4-major\bin\arm-none-eabi-gdb.exe: warning: Couldn't determine a path for the index cache directory.
Reading symbols from E:\tm4c123gxl\blinky/build/blinky.elf...
0x0000031c in delayMs (n=500) at E:/tm4c123gxl/blinky/src/main.c:39
39	        for (j = 0; j < 3180; j++)
Program stopped, probably due to a reset and/or halt issued by debugger
SRST error
SRST error
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x00000354 msp: 0x2000021c
SRST error
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x00000354 msp: 0x2000021c
SRST error
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x00000354 msp: 0x2000021c
Note: automatically using hardware breakpoints for read-only addresses.

Temporary breakpoint 1, main () at E:/tm4c123gxl/blinky/src/main.c:16
16	    SYSCTL_RCGC2_R |= 0x00000020;
Vscode-cortex-debug-window.png


By default there are several debug views available. With the .svd file, we have access to the peripheral register too:

Vscode-cortex-debug-views.png


Debug Commands

There are the usual debug commands (continue, stepping, restart) plus a run and debug toolbar

Vscode-cortex-debug-toolbar.png

Assembly Stepping

Press CTRL+SHIFT+P to invoke command palette. Then Select Cortex-Debug:View Disassembly(Functon), type the function name you want to disassemble. 

  1. 0x000002ac: 80 b5           	push	{r7, lr}
  2. 0x000002ae: 00 af           	add	r7, sp, #0
  3. 0x000002b0: 0e 4b           	ldr	r3, [pc, #56]	; (0x2ec <main+64>)
  4. 0x000002b2: 1b 68           	ldr	r3, [r3, #0]
  5. 0x000002b4: 0d 4a           	ldr	r2, [pc, #52]	; (0x2ec <main+64>)
  6. 0x000002b6: 43 f0 20 03     	orr.w	r3, r3, #32
  7. 0x000002ba: 13 60           	str	r3, [r2, #0]
  8. 0x000002bc: 0c 4b           	ldr	r3, [pc, #48]	; (0x2f0 <main+68>)
  9. 0x000002be: 0e 22           	movs	r2, #14
  10. 0x000002c0: 1a 60           	str	r2, [r3, #0]
  11. 0x000002c2: 0c 4b           	ldr	r3, [pc, #48]	; (0x2f4 <main+72>)
  12. 0x000002c4: 0e 22           	movs	r2, #14
  13. 0x000002c6: 1a 60           	str	r2, [r3, #0]
  14. 0x000002c8: 0b 4b           	ldr	r3, [pc, #44]	; (0x2f8 <main+76>)
  15. 0x000002ca: 0e 22           	movs	r2, #14
  16. 0x000002cc: 1a 60           	str	r2, [r3, #0]
  17. 0x000002ce: 4f f4 fa 70     	mov.w	r0, #500	; 0x1f4
  18. 0x000002d2: 00 f0 13 f8     	bl	0x2fc <delayMs>
  19. 0x000002d6: 08 4b           	ldr	r3, [pc, #32]	; (0x2f8 <main+76>)
  20. 0x000002d8: 1b 68           	ldr	r3, [r3, #0]
  21. 0x000002da: 07 4a           	ldr	r2, [pc, #28]	; (0x2f8 <main+76>)
  22.  
  23. 0x000002dc: 03 f0 f1 03     	and.w	r3, r3, #241	; 0xf1
  24. 0x000002e0: 13 60           	str	r3, [r2, #0]
  25. 0x000002e2: 4f f4 fa 70     	mov.w	r0, #500	; 0x1f4
  26. 0x000002e6: 00 f0 09 f8     	bl	0x2fc <delayMs>
  27. 0x000002ea: ed e7           	b.n	0x2c8 <main+28>
  28. 0x000002ec: 08 e1           	b.n	0x500
  29. 0x000002ee: 0f 40           	ands	r7, r1
  30. 0x000002f0: 00 54           	strb	r0, [r0, r0]
  31. 0x000002f2: 02 40           	ands	r2, r0
  32. 0x000002f4: 1c 55           	strb	r4, [r3, r4]
  33. 0x000002f6: 02 40           	ands	r2, r0
  34. 0x000002f8: fc 53           	strh	r4, [r7, r7]
  35. 0x000002fa: 02 40           	ands	r2, r0
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