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SubjectRe: [PATCH 0/17] tracehook & user_regset for ARM
Russell, did you manage to take a look at this?

On Fri, Apr 24, 2009 at 05:06:34PM -0700, Roland McGrath wrote:
> The various things listed under CONFIG_HAVE_ARCH_TRACEHOOK (arch/Kconfig)
> are what each arch wants to do nowadays to fit with the generic code for
> user debugging, core dumping, etc. The "big machine" arch's have done this
> since 2.6.28 or earlier.
>
> Christoph suggested helping ARM with the work would be a good way to
> encourage all the "little machine" arch maintainers to catch up soon.
> (Of the "little machine" and oddball arch's, so far only sh has it.)
>
> The following patches bring ARM up to speed with HAVE_ARCH_TRACEHOOK (just
> about). There are so many patches because I sliced them into many small
> changes. Each patch is pretty short (some of them very tiny). The overall
> diffstat from the whole series is attached in the "pull request" below.
>
> This series is relative to ~2.6.30-rc3 (0c8454f). I expect it rebases
> easily to whatever tree you might want to queue it on.
>
> The immediate user-visible effects of the series are to enable the
> /proc/pid/syscall feature, and to add VFP, WMMX, Crunch, and $tp register
> data to core dumps.
>
> AFAIK only the asm/syscall.h patch still needs work. The preliminary
> version is only buggy in the way that /proc/pid/syscall will give bogus
> answers for a task not really in a syscall, or for the non-EABI entry
> styles. It's not unsafe or anything. It needs some attention from folks
> who really know ARM to fill in the truly proper version of syscall_get_nr().
>
> I only know how to run and test one ABI flavor, and only in qemu. I used
> versatile_defconfig and ran it in qemu-system-arm -M versatilepb using NFS
> root with the userland binaries from Fedora ARM.
>
> I don't know how to simulate hardware that has iWMMXt or Crunch, nor if my
> ARM userland handles those kernel configurations. So I've only
> (cross-)compile-tested the iWMMXt and Crunch code. (It is however the
> simplest of the user_regset code and pretty easy to eyeball-review.)
>
> My testing is quite minimal. Booted, nothing went wrong, simple strace
> uses still look sane, "cat /proc/self/syscall" looks right, core dump
> contents look right. (Not knowing the arch at all, I don't actually know
> how to put anything in the FPA or VFP registers so as to notice they are
> right rather than just the right number of zeros.) The userland I have
> does not have gdb (and qemu would take a week to build and run the gdb
> testsuite if it did), so I didn't try to test any ptrace use beyond what
> strace does.
>
>
> Thanks,
> Roland
>
> ---
>
> The following changes since commit 0c8454f56623505a99463405fd7d5664adfbb094:
> Rafael J. Wysocki (1):
> PM/Hibernate: Fix waiting for image device to appear on resume
>
> are available in the git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland.git arm/tracehook
>
> Roland McGrath (17):
> arm: arch_ptrace clean-up
> arm: arch_ptrace indentation
> arm: tracehook_report_syscall
> arm: tracehook_signal_handler
> arm: TIF_NOTIFY_RESUME
> arm: user_regset: general regs
> arm: user_regset: FPU regs
> arm: CORE_DUMP_USE_REGSET
> arm: user_regset: VFP regs
> arm: user_regset: VFP in core dumps
> arm: user_regset: iWMMXt regs
> arm: user_regset: iWMMXt in core dumps
> arm: user_regset: Crunch regs
> arm: user_regset: Crunch in core dumps
> arm: user_regset: thread pointer in core dumps
> arm: asm/syscall.h (unfinished)
> arm: HAVE_ARCH_TRACEHOOK
>
> arch/arm/Kconfig | 1 +
> arch/arm/include/asm/elf.h | 1 +
> arch/arm/include/asm/ptrace.h | 4 +-
> arch/arm/include/asm/syscall.h | 65 +++++
> arch/arm/include/asm/thread_info.h | 4 +
> arch/arm/kernel/entry-common.S | 2 +-
> arch/arm/kernel/ptrace.c | 526 ++++++++++++++++++++++++------------
> arch/arm/kernel/signal.c | 7 +
> include/linux/elf.h | 3 +
> 9 files changed, 433 insertions(+), 180 deletions(-)
> create mode 100644 arch/arm/include/asm/syscall.h
---end quoted text---


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