linux.git/arch/arm/kernel/ptrace.c, branch v3.0

ARM: 6883/1: ptrace: Migrate to regsets framework

2011-05-14T20:36:55+00:00

This patch migrates the implementation of the ptrace interface for
the core integer registers, legacy FPA registers and VFP registers
to use the regsets framework.

As an added bonus, all this stuff gets included in coredumps
at no extra cost.  Without this patch, coredumps contained no
VFP state.

Third-party extension register sets (iwmmx, crunch) are not migrated
by this patch, and continue to use the old implementation;
these should be migratable without much extra work.

Signed-off-by: Dave Martin 
Acked-by: Will Deacon 
Signed-off-by: Russell King

arm, hw_breakpoints: Fix racy access to ptrace breakpoints

2011-04-25T15:35:18+00:00

While the tracer accesses ptrace breakpoints, the child task may
concurrently exit due to a SIGKILL and thus release its breakpoints
at the same time. We can then dereference some freed pointers.

To fix this, hold a reference on the child breakpoints before
manipulating them.

Reported-by: Oleg Nesterov 
Signed-off-by: Frederic Weisbecker 
Acked-by: Will Deacon 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Prasad 
Cc: Paul Mundt 
Link: http://lkml.kernel.org/r/1302284067-7860-5-git-send-email-fweisbec@gmail.com

Merge branch 'misc' into devel

2011-03-16T23:35:25+00:00

Conflicts:
	arch/arm/Kconfig

ARM: 6767/1: ptrace: fix register indexing in GETHBPREGS request

2011-02-26T13:35:50+00:00

The GETHBPREGS ptrace request incorrectly maps its index argument onto
the thread's saved debug state when the index != 0. This has not yet
been seen from userspace because GDB (the only user of this request)
only reads from register 0.

This patch fixes the indexing.

Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: 6668/1: ptrace: remove single-step emulation code

2011-02-23T17:24:22+00:00

PTRACE_SINGLESTEP is a ptrace request designed to offer single-stepping
support to userspace when the underlying architecture has hardware
support for this operation.

On ARM, we set arch_has_single_step() to 1 and attempt to emulate hardware
single-stepping by disassembling the current instruction to determine the
next pc and placing a software breakpoint on that location.

Unfortunately this has the following problems:

1.) Only a subset of ARMv7 instructions are supported
2.) Thumb-2 is unsupported
3.) The code is not SMP safe

We could try to fix this code, but it turns out that because of the above
issues it is rarely used in practice.  GDB, for example, uses PTRACE_POKETEXT
and PTRACE_PEEKTEXT to manage breakpoints itself and does not require any
kernel assistance.

This patch removes the single-step emulation code from ptrace meaning that
the PTRACE_SINGLESTEP request will return -EIO on ARM. Portable code must
check the return value from a ptrace call and handle the failure gracefully.

Acked-by: Nicolas Pitre 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: ptrace: fix style issue with hw_breakpoint interface

2010-12-06T11:55:57+00:00

This patch fixes a trivial style issue in ptrace.c.

Signed-off-by: Will Deacon

ptrace: cleanup arch_ptrace() on ARM

2010-10-28T01:03:10+00:00

use new 'datap' variable in order to remove unnecessary castings.

Signed-off-by: Namhyung Kim 
Cc: Russell King 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ptrace: change signature of arch_ptrace()

2010-10-28T01:03:10+00:00

Fix up the arguments to arch_ptrace() to take account of the fact that
@addr and @data are now unsigned long rather than long as of a preceding
patch in this series.

Signed-off-by: Namhyung Kim 
Cc: 
Acked-by: Roland McGrath 
Acked-by: David Howells 
Acked-by: Geert Uytterhoeven 
Acked-by: David S. Miller 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ARM: 6357/1: hw-breakpoint: add new ptrace requests for hw-breakpoint interaction

2010-09-08T09:05:00+00:00

For debuggers to take advantage of the hw-breakpoint framework in the kernel,
it is necessary to expose the API calls via a ptrace interface.

This patch exposes the hardware breakpoints framework as a collection of
virtual registers, accesible using PTRACE_SETHBPREGS and PTRACE_GETHBPREGS
requests. The breakpoints are stored in the debug_info struct of the running
thread.

Cc: Frederic Weisbecker 
Cc: S. Karthikeyan 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King

ARM: 6199/1: Add kprobe-based event tracer

2010-07-09T13:41:34+00:00

This patch enables the HAVE_REGS_AND_STACK_ACCESS_API option
for ARM which is required by the kprobe events tracer. Code based
on the PowerPC port.

Cc: Jean Pihet 
Tested-by: Jamie Iles 
Signed-off-by: Will Deacon 
Signed-off-by: Russell King