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Blackfin arch: ensure that speculative loads of bad pointers don't cause us to do bad things.

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Fix/change formatting of a few more things.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Robin Getz
2007-10-29 18:23:28 +08:00
committed by Bryan Wu
parent 15b3ad6a4b
commit 9f336a5326
5 changed files with 21 additions and 2 deletions
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14
arch/blackfin/kernel/fixed_code.S
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@@ -129,4 +129,18 @@ ENTRY(_atomic_xor32)
rts;
ENDPROC (_atomic_ior32)
.align 16
/*
* safe_user_instruction
* Four NOPS are enough to allow the pipeline to speculativily load
* execute anything it wants. After that, things have gone bad, and
* we are stuck - so panic. Since we might be in user space, we can't
* call panic, so just cause a unhandled exception, this should cause
* a dump of the trace buffer so we can tell were we are, and a reboot
*/
ENTRY(_safe_user_instruction)
NOP; NOP; NOP; NOP;
EXCPT 0x4;
ENDPROC(_safe_user_instruction)
ENTRY(_fixed_code_end)