linux-stable.git/arch/openrisc/kernel/entry.S, branch linux-4.3.y

openrisc: Rework signal handling

2014-01-09T09:57:21+00:00

The mainline signal handling code for OpenRISC has been buggy since day
one with respect to syscall restart.  This patch significantly reworks
the signal handling code:

i)   Move the "work pending" loop to C code (borrowed from ARM arch)

ii)  Allow a tracer to muck about with the IP and skip syscall restart
     in that case (again, borrowed from ARM)

iii) Make signal handling WRT syscall restart actually work

v)   Make the signal handling code look more like that of other
     architectures so that it's easier for others to follow

Reported-by: Anders Nystrom 
Signed-off-by: Jonas Bonn

Merge branch 'for-upstream' of git://openrisc.net/jonas/linux

2013-02-27T03:46:23+00:00

Pull OpenRISC updates from Jonas Bonn:
 "An equal number of bug fixes and trivial cleanups; no new features.

   - Two patches to fix errors thrown by the updated toolchain.

   - Three other bug fixes.

   - Four trivial cleanups."

* 'for-upstream' of git://openrisc.net/jonas/linux:
  openrisc: add missing header inclusion
  openrisc: really pass correct arg to schedule_tail
  Add bitops include needed for ext2 filesystem
  openrisc: update DTLB-miss handler last
  openrisc: fix up vmalloc page table loading
  openrisc idle: delete pm_idle
  openrisc: remove CONFIG_SYMBOL_PREFIX
  openrisc: avoid using function parameter regs in reset vector
  openrisc: remove unused current_regs

openrisc: really pass correct arg to schedule_tail

2013-02-17T07:46:21+00:00

Commit 287ad220cd8b5a9d29f71c78f6e4051093f051fc tried to set up the argument
to schedule_tail, but ended up using TI_STACK which isn't a defined symbol.
Sadly, the old openrisc compiler silently ignores this fact and it was first
discovered now when building with an updated toolchain.

Reported-by: Christian Svensson 
Signed-off-by: Jonas Bonn

openrisc: fix up vmalloc page table loading

2013-02-14T15:39:26+00:00

vmalloc'ed pages are faulted into a process' page tables on demand.  In
order to facilitate this, do_page_fault needs to know whether it was
called via a page fault exception or a TLB-miss exception.

This patch adds a wrapper around the _x_page_fault_handler entry points
that the TLB-miss exceptions can call into in order to have the relevant
parameter set to satisfy do_page_fault.

This fixes a bug and is "good enough" for now.  That said, this whole
handling of vmalloc needs to be audited for correctness at some point.

Signed-off-by: Jonas Bonn

openrisc: switch to generic sigaltstack

2013-02-03T23:16:05+00:00

Signed-off-by: Al Viro

openrisc: switch to use of generic fork and clone

2012-11-29T04:43:40+00:00

Signed-off-by: Al Viro

openrisc: use generic sys_execve

2012-10-19T16:33:01+00:00

Signed-off-by: Jonas Bonn

openrisc: use generic kernel_thread/kernel_execve

2012-10-19T16:32:36+00:00

Signed-off-by: Jonas Bonn

openrisc: pass correct arg to schedule_tail

2012-10-19T16:32:36+00:00

schedule_tail() requires that the 'prev' task be passed as an argument
to it.  This arg is set in _switch, just before 'returning' to one of
the ret_* functions where schedule_tail is invoked.

Signed-off-by: Jonas Bonn

openrisc: use scratch regs in atomic syscall

2012-05-08T09:43:59+00:00

The function sys_or1k_atomic was using call-saved registers without
restoring their value before returning.  This is a faux pas: either
we need to restore their values or use scratch regs; the latter is
less code so that's the route this patch takes.

Thanks to David Hennerström for doing most of the heavy-lifting in
tracking this one down.

Reported-by: Davd Hennerström 
Signed-off-by: Jonas Bonn