[N.B.] QEMU's gdbserver compatibility

[shahab-vahedi]

The new QEMU's gdbserver can only be used in conjunction with GDB release arc-2021.03+. The old one can be used freely.

What does new QEMU mean?
Since there is no tags in QEMU yet, I cannot refer to a release/date. New QEMU comes with the following code:

gdb-xml/arc-v2-core.xml:
...
<feature name="org.gnu.gdb.arc.core">
...

While the old QEMU has the following content:

gdb-xml/arc-core-v2.xml:
...
<feature name="org.gnu.gdb.arc.core.v2">
...

Notice the difference between both the file paths and the feature name.

[abrodkin]

Not a bug, but a known behavior.

[jthampan]

Hi, I am facing this issue with latest Zephyr SDK since the GDB version is old
How to resolve it, as i don't know how to generate Zephyr SDK with a new version of GDB

[abrodkin]

@Joetham there're 2 options I guess:

1. Use GDB client from our pre-built toolchain. For example from here: https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2021.09-release/arc_gnu_2021.09_prebuilt_elf32_le_linux_install.tar.gz
   That could be done easily and right now. Please try it and let me know if it works.
2. Update GDB version in Zephyr's SDK.
   That will require additional work and I think we'll do that as a part of ARC tools update in the Zephyr's SDK. Which we'll do via GDB for ARC doesn't work with QEMU v5.x+ zephyrproject-rtos/sdk-ng#455 as a part of the upcoming Zephyr SDK update.

[shahab-vahedi]

@Joetham this is just an example for ARCv2 (hs) target:

INST=${HOME}/arc-gdb

#REPO=https://github.com/foss-for-synopsys-dwc-arc-processors/binutils-gdb.git
REPO=https://sourceware.org/git/binutils-gdb.git

#git clone --single-branch --branch arc-2021.09-gdb "${REPO}"
git clone "${REPO}"

cd binutils-gdb
./configure --target=arc-elf          \
            --with-cpu=archs          \
            --disable-shared          \
            --disable-threads         \
            --disable-tls             \
            --prefix=${INST}          \
            --disable-ld              \
            --disable-gas             \
            --disable-binutils

make -j $(nproc) all-gdb
make             install-gdb

If you do have further questions, please kindly open a new issue.

[jthampan]

Thanks this way i can debug