CVS commit: src/sys/arch/aarch64

["Ryo Shimizu" <ryo%netbsd.org@localhost>]

Module Name:    src
Committed By:   ryo
Date:           Tue Mar  9 16:44:27 UTC 2021

Modified Files:
        src/sys/arch/aarch64/aarch64: cpu.c cpuswitch.S db_machdep.c trap.c
            vectors.S
        src/sys/arch/aarch64/include: db_machdep.h

Log Message:
Add support hardware breakpoint and watchpoint again.

Limited support for hardware watchpoint has been available for some time, but it
has not been working properly. In addition, it stopped working at the time of
the PTRACE support commit on 2018-12-13. This has been fixed to work correctly,
and also fixed to be practical by sharing hardware watchpoints and breakpoints
between CPUs on MULTIPROCESSOR.

Also fixed a bug that causes a malfunction when switching CPUs with
"machine cpu N" when entering ddb mode from other than cpu_Debugger().

I have confirmed that the CPU can be switched by "machine cpu N" and return from
ddb properly in each case where ddb is called triggered by ddb break/watchpoint,
hardware break/watchpoint, and cpu_Debugger().


To generate a diff of this commit:
cvs rdiff -u -r1.58 -r1.59 src/sys/arch/aarch64/aarch64/cpu.c
cvs rdiff -u -r1.32 -r1.33 src/sys/arch/aarch64/aarch64/cpuswitch.S
cvs rdiff -u -r1.36 -r1.37 src/sys/arch/aarch64/aarch64/db_machdep.c
cvs rdiff -u -r1.44 -r1.45 src/sys/arch/aarch64/aarch64/trap.c
cvs rdiff -u -r1.21 -r1.22 src/sys/arch/aarch64/aarch64/vectors.S
cvs rdiff -u -r1.11 -r1.12 src/sys/arch/aarch64/include/db_machdep.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.