openOCD 0.8.0 on LM4F / TM4C — Fix for 'Error: gdb requested a non-existing register'

Other Parts Discussed in Thread: ENERGIA, TM4C123GH6PM

Debugging used to work with previous version of openOCD but no longer works with version 0.8.0.

I don't understand the Error: gdb requested a non-existing register message.

Configuration

• LaunchPad LM4F120 and TM4C123
• Energia 0101E0012 framework
• Sketch blink.ino
• Open On-Chip Debugger 0.8.0
• GNU gdb (GNU Tools for ARM Embedded Processors) 7.4.1
• GCC tool-chain 4.7.3 20130312
• Mac OS X 10.9.3
• Unchanged ek_lm4f120xl.cfg and ek_lm4f120xl.xml files

First window = openocd

$ openocd --file /Users/ReiVilo/Documents/Projets/Xcode/embed2/embed2/Utilities/ek_lm4f120xl.cfg
Open On-Chip Debugger 0.8.0 (2014-05-10-14:22)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.sourceforge.net/doc/doxygen/bugs.html
Info : This adapter doesn't support configurable speed
Info : ICDI Firmware version: 9270
Info : lm4f120h5qr.cpu: hardware has 6 breakpoints, 4 watchpoints

Second window = arm-none-eabi-gdb

$ /Applications/Energia.app/Contents/Resources/Java/hardware/tools/lm4f/bin/arm-none-eabi-gdb

GNU gdb (GNU Tools for ARM Embedded Processors) 7.4.1.20130312-cvs

Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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 "--host=x86_64-apple-darwin10 --target=arm-none-eabi".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
(gdb)

Commands and answers

Commands on second window = arm-none-eabi-gdb

Answers from first window = openocd

(gdb) file '/var/folders/5d/dky9xc691m32kztqnhkn8bhw0000gn/T/build667309560293890230.tmp/Blink.cpp.elf
(gdb) set tdesc filename /Users/ReiVilo/Documents/Projets/Xcode/embed2/embed2/Utilities/ek_lm4f120xl.xml
(gdb) set remotetimeout 2000
(gdb) target extended :3333

Info : accepting 'gdb' connection from 3333
undefined debug reason 7 - target needs reset

(gdb) monitor reset halt

target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x000002b4 msp: 0x20008000

(gdb) load

target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x000002b4 msp: 0x20008000
target state: halted
target halted due to breakpoint, current mode: Thread
xPSR: 0x61000000 pc: 0x20000042 msp: 0x20008000
target state: halted
target halted due to debug-request, current mode: Thread
xPSR: 0x01000000 pc: 0x000002b4 msp: 0x20008000
Error: gdb requested a non-existing register
Info : dropped 'gdb' connection

(gdb) monitor reset init

ek_lm4f120xl.cfg file

# TI Stellaris Launchpad ek-lm4f120xl Evaluation Kits
#
# http://www.ti.com/tool/ek-lm4f120xl
#
#
# NOTE: using the bundled ICDI interface is optional!
# This interface is not ftdi based as previous board were
#
#
source [find interface/ti-icdi.cfg]
set WORKAREASIZE 0x8000
#set WORKAREASIZE 0x4000
set CHIPNAME lm4f120h5qr
source [find target/stellaris_icdi.cfg]

ek_lm4f120xl.xml file

<?xml version="1.0"?>

<!DOCTYPE target SYSTEM "gdb-target.dtd">
<target>
<feature name="org.gnu.gdb.arm.core">
<reg name="r0" bitsize="32" type="uint32"/>
<reg name="r1" bitsize="32" type="uint32"/>
<reg name="r2" bitsize="32" type="uint32"/>
<reg name="r3" bitsize="32" type="uint32"/>
<reg name="r4" bitsize="32" type="uint32"/>
<reg name="r5" bitsize="32" type="uint32"/>
<reg name="r6" bitsize="32" type="uint32"/>
<reg name="r7" bitsize="32" type="uint32"/>
<reg name="r8" bitsize="32" type="uint32"/>
<reg name="r9" bitsize="32" type="uint32"/>
<reg name="r10" bitsize="32" type="uint32"/>
<reg name="r11" bitsize="32" type="uint32"/>
<reg name="r12" bitsize="32" type="uint32"/>
<reg name="sp" bitsize="32" type="data_ptr"/>
<reg name="lr" bitsize="32"/>
<reg name="pc" bitsize="32" type="code_ptr"/>
<reg name="cpsr" bitsize="32" regnum="25"/>
</feature>
<feature name="org.gnu.gdb.arm.fpa">
<reg name="f0" bitsize="96" type="arm_fpa_ext" regnum="16"/>
<reg name="f1" bitsize="96" type="arm_fpa_ext"/>
<reg name="f2" bitsize="96" type="arm_fpa_ext"/>
<reg name="f3" bitsize="96" type="arm_fpa_ext"/>
<reg name="f4" bitsize="96" type="arm_fpa_ext"/>
<reg name="f5" bitsize="96" type="arm_fpa_ext"/>
<reg name="f6" bitsize="96" type="arm_fpa_ext"/>
<reg name="f7" bitsize="96" type="arm_fpa_ext"/>
<reg name="fps" bitsize="32"/>
</feature>
</target>

Solution

set tdesc filename ek_lm4f120xl.xml