gdb ARM Cortex-M异常解除

Question

I have been working with some Cortex-M4 (Freescale K60) devices with a compiled by me GCC (v4.7.2), BinUtils (v2.22), Newlib (v1.20) and GDB (v7.5). I have always been annoyed by GDB's inability to unwind from hard exceptions.

recently I had an opportunity to use FreeScale's CodeWarrior, where I loaded my binary for debug (compiled by my tools), and it could unwind the exception. It looks like CodeWarrior is running GDB v7.4.1 under the hood. Is there some patch I missed for GDB, or some configure option?

Here is the script used to build GDB: TOOLCHAIN=gdb-7.5 mkdir -p BUILD/gdb cd BUILD/gdb ../../${TOOLCHAIN}/configure --prefix=${PREFIX} --target=${TARGET} --enable-interwork --enable-multilib --with-expat=yes --with-python --without-auto-load-safe-path 2>&1 | tee configure.out make all install cd ../../

Thanks!

Answer 1

GDB can do Cortex M profile exception unwinding, once you tell it that the target is actually Cortex M profile using a Target Description XML with correct Feature .

This can be done via the set target tdesc <filename> command, but newer gdb servers (eg OpenOCD) should do so already.