linux-toradex.git/arch/avr32/kernel/ptrace.c, branch v4.2.4

ptrace: cleanup arch_ptrace() on avr32

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

use new 'datap' variable type of void pointer in order to remove unnecessary
castings.

Signed-off-by: Namhyung Kim 
Acked-by: Haavard Skinnemoen 
Cc: Hans-Christian Egtvedt 
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

arch/avr32: fix build failure caused by wrong prototype

2010-04-27T23:26:03+00:00

This patch fixes a build failure introduced by 1d8393171 ("avr32: use
generic ptrace_resume code") which had the static keyword as a leftover.

  arch/avr32/kernel/ptrace.c:32: error: static declaration of `user_enable_single_step' follows non-static declaration
  include/linux/ptrace.h:268: error: previous declaration of `user_enable_single_step' was here

References:
[1]http://kisskb.ellerman.id.au/kisskb/buildresult/2448162/

Signed-off-by: Peter Huewe 
Cc: Haavard Skinnemoen 
Cc: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

avr32: use generic ptrace_resume code

2010-03-12T23:52:38+00:00

Use the generic ptrace_resume code for PTRACE_SYSCALL, PTRACE_CONT,
PTRACE_KILL and PTRACE_SINGLESTEP.  This implies defining
arch_has_single_step in  and implementing the
user_enable_single_step and user_disable_single_step functions, which also
causes the breakpoint information to be cleared on fork, which could be
considered a bug fix.

Also the TIF_SYSCALL_TRACE thread flag is now cleared on PTRACE_KILL which
it previously wasn't which is consistent with all architectures using the
modern ptrace code.

Currently avr32 doesn't implement any code to disable single stepping when
one of the non-syscall requests is called which seems wrong, but I've left
it as-is for now.

Signed-off-by: Christoph Hellwig 
Cc: Oleg Nesterov 
Cc: Roland McGrath 
Acked-by: Haavard Skinnemoen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[AVR32] Enable debugging only when needed

2008-01-25T07:31:39+00:00

Keep track of processes being debugged (including the kernel itself)
and turn the OCD system on and off as appropriate. Since enabling
debugging turns off some optimizations in the CPU core, this fixes the
issue that enabling KProbes support or simply running a program under
gdbserver will reduce system performance significantly until the next
reboot.

The CPU performance will still be reduced for all processes while a
process is being debugged, but this is a lot better than reducing the
performance forever.

Signed-off-by: Haavard Skinnemoen

[AVR32] Follow the rules when dealing with the OCD system

2007-12-07T13:54:46+00:00

The current debug trap handling code does a number of things that are
illegal according to the AVR32 Architecture manual. Most importantly,
it may try to schedule from Debug Mode, thus clearing the D bit, which
can lead to "undefined behaviour".

It seems like this works in most cases, but several people have
observed somewhat unstable behaviour when debugging programs,
including soft lockups. So there's definitely something which is not
right with the existing code.

The new code will never schedule from Debug mode, it will always exit
Debug mode with a "retd" instruction, and if something not running in
Debug mode needs to do something debug-related (like doing a single
step), it will enter debug mode through a "breakpoint" instruction.
The monitor code will then return directly to user space, bypassing
its own saved registers if necessary (since we don't actually care
about the trapped context, only the one that came before.)

This adds three instructions to the common exception handling code,
including one branch. It does not touch super-hot paths like the TLB
miss handler.

Signed-off-by: Haavard Skinnemoen

[AVR32] Clean up OCD register usage

2007-12-07T13:54:40+00:00

Generate a new set of OCD register definitions in asm/ocd.h and rename
__mfdr() and __mtdr() to ocd_read() and ocd_write() respectively.

The bitfield definitions are a lot more complete now, and they are
entirely based on bit numbers, not masks. This is because OCD
registers are frequently accessed from assembly code, where bit
numbers are a lot more useful (can be fed directly to sbr, bfins,
etc.)

Bitfields that consist of more than one bit have two definitions:
_START, which indicates the number of the first bit, and _SIZE, which
indicates the number of bits. These directly correspond to the
parameters taken by the bfextu, bfexts and bfins instructions.

Signed-off-by: Haavard Skinnemoen

Consolidate PTRACE_DETACH

2007-10-16T16:42:49+00:00

Identical handlers of PTRACE_DETACH go into ptrace_request().
Not touching compat code.
Not touching archs that don't call ptrace_request.

Signed-off-by: Alexey Dobriyan 
Acked-by: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

PTRACE_POKEDATA consolidation

2007-07-17T17:23:03+00:00

Identical implementations of PTRACE_POKEDATA go into generic_ptrace_pokedata()
function.

AFAICS, fix bug on xtensa where successful PTRACE_POKEDATA will nevertheless
return EPERM.

Signed-off-by: Alexey Dobriyan 
Cc: Christoph Hellwig 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

PTRACE_PEEKDATA consolidation

2007-07-17T17:23:03+00:00

Identical implementations of PTRACE_PEEKDATA go into generic_ptrace_peekdata()
function.

Signed-off-by: Alexey Dobriyan 
Cc: Christoph Hellwig 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds