[PATCH] i386: fix stack alignment for signal handlers

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This fixes the setup of the alignment of the signal frame, so that all
signal handlers are run with a properly aligned stack frame.

The current code "over-aligns" the stack pointer so that the stack frame
is effectively always mis-aligned by 4 bytes.  But what we really want
is that on function entry ((sp + 4) & 15) == 0, which matches what would
happen if the stack were aligned before a "call" instruction.

Signed-off-by: Markus F.X.J. Oberhumer <markus@oberhumer.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

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Markus F.X.J. Oberhumer 2005-10-09 18:54:23 +02:00 • committed by Linus Torvalds

parent 867f8b4e47

commit d347f37227

2 changed files with 10 additions and 2 deletions

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6

arch/i386/kernel/signal.c

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6

arch/x86_64/ia32/ia32_signal.c

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