MIPS: Hardware watch register support for gdb (version 3).

David Daney linux-mips lkml 1 version Aug 28, 2008 In review

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* Agreement from gdb maintainers that the ptrace interface is workable.

* Work around for watchhi registers that do not report the I, R, and W condition bits.

* General cleanup, including making much less code conditionally compiled.

5 of 6 patches are in this archive. The cover letter announces 6.

#	Subject and files	Size	Replies
2/6	MIPS: Add HARDWARE_WATCHPOINTS definitions and support code.`arch/mips/kernel/Makefile` `arch/mips/kernel/watch.c` `include/asm-mips/cpu-info.h` +3 more	+223 -1	0 replies
3/6	MIPS: Probe watch registers and report configuration.`arch/mips/kernel/cpu-probe.c` `arch/mips/kernel/proc.c`	+10 -2	0 replies
4/6	MIPS: Watch exception handling for HARDWARE_WATCHPOINTS.`arch/mips/kernel/genex.S` `arch/mips/kernel/traps.c`	+13 -5	0 replies
5/6	MIPS: Scheduler support for HARDWARE_WATCHPOINTS.`include/asm-mips/system.h`	+2 -0	0 replies
6/6	MIPS: Ptrace support for HARDWARE_WATCHPOINTS`arch/mips/kernel/ptrace.c` `arch/mips/kernel/ptrace32.c` `include/asm-mips/ptrace.h`	+142 -1	0 replies

No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.

Cover letter [Patch 0/6] MIPS: Hardware watch register support for gdb (version 3).

Esteemed kernel hackers,

To follow is my third pass at MIPS watch register support.

This version has been tested on:

* MIPS 4KEc (mips32) with a single set of watch registers watchhi not reporting I, R, and W conditions.

* MIPS 4KEc (mips32r2) with four sets of watch registers.

* R5000 SGI O2 (mips4 64bit) with no watch register support.

The patches are against 2.6.27-rc4

Changes from the previous version:

* Agreement from gdb maintainers that the ptrace interface is workable.

* Work around for watchhi registers that do not report the I, R, and W condition bits.

* General cleanup, including making much less code conditionally compiled.

To really test the patch you will need a patched gdb. My current gdb patch is here:

If you have any comments or questions please let me know.

David Daney