qemu user gdb example

Author: cirosantilli

README.adoc

@@ -6586,12 +6586,20 @@ Anyways, this warns us that the userland emulation will likely not be reliable,
 GDB step debugging is also possible with:
 
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-qemu-arm -g 1234 -L . bin/ls
-../host/usr/bin/arm-buildroot-linux-uclibcgnueabi-gdb -ex 'target remote localhost:1234'
+cd out/arm/buildroot/target
+qemu-arm -g 1234 -L . ../build/kernel_module-1.0/user/myinsmod.out
+../host/usr/bin/arm-buildroot-linux-uclibcgnueabihf-gdb \
+  --nh \
+  -ex 'set architecture arm' \
+  -ex 'set sysroot .' \
+  -ex 'file ../build/kernel_module-1.0/user/myinsmod.out' \
+  -ex 'target remote localhost:1234' \
+  -ex 'break main' \
+  -ex 'continue' \
+  -ex 'layout split' \
+;
 ....
 
-TODO: find source. Lazy now.
-
 link:https://stackoverflow.com/questions/48959349/how-to-solve-fatal-kernel-too-old-when-running-gem5-in-syscall-emulation-se-m[crosstool-ng] tests show that QEMU also has a runtime check for the kernel version which can fail as:
 
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