hi all
I am announcing updates in the implementation of branch tracing using
coresight etm in GDB. in this update, functions and instruction history
are running successfully on single threaded applications. reverse
debugging is basically working with the limitation that sometimes cspr
register (register 25) is required but current implementation does not
provide it.
the feature requires linux kernel v 4.19 or higher with manual etm sink
setup. 5.9.1 or higher for automatic sink selection.
GDB gdb.btrace test suite was adapted to run on arm processors. here is
the summary of the gdb.btrace test results executed on an STM32MP157
(ARM cortex A7) with Linux kernel 5.9.1
=== gdb Summary ===
# of expected passes 390
# of unexpected failures 119
# of unsupported tests 4
following tests are 100% successful:
- buffer-size
- enable
- instruction_history
- function_call_history
- data
- delta
- cpu
- gcore
- record_goto-step
- dlopen
- vdso
- segv
GDB source code is available on
https://github.com/gzied/binutils-gdb/tree/gdb_arm_coresight
many thanks to GDB and linaro communities for their support
Kind Regards
Zied Guermazi
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