m68knommu: fix signal handling return path

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The return from software signal handling pushes code on the stack
that system calls to the kernels cleanup code. This is borrowed
directly from the m68k linux signal handler.

The rt signal case is not quite right for the restricted instruction
set of the ColdFire parts. And neither the normal signal case or rt
signal case properly flushes/pushes the appropriate cache lines.

Rework the return path to just call back through some code fragments
in the kernel proper (with no MMU in the way we can do this). No
cache problems, and less code overall.

Original patch submitted by Wilson Callan <wcallan@savantav.com>

Greg fixed the rt signal return path to use the proper system call

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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Wilson Callan 2008-05-01 12:16:28 +10:00 • committed by Linus Torvalds

parent 10ed2195bb

commit 2d7f16d6d1

2 changed files with 13 additions and 17 deletions

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9

arch/m68knommu/kernel/entry.S

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21

arch/m68knommu/kernel/signal.c

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