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Blackfin arch: Fix random crash issue found by Michael. 

This is fixes a problem where we could jump to the wrong address. By
doing a "p0 = reti; jump (p0)". If a different, higher level interrupt
came in, just before, rather than returning to the calling function, we
would return to a random place in the kernel.

This very elegant fix from Bernd grabs the return location off the
stack, and places it into P0, so when we do a return, it goes to the
correct place.

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 18:14:15 +08:00 committed by Bryan Wu
parent 7728ec33fa
commit aa770aa790
1 changed files with 4 additions and 2 deletions
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6
arch/blackfin/kernel/entry.S
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@ -54,9 +54,11 @@ ENTRY(_ret_from_fork)
[sp + PT_IPEND] = r0;
/* do a 'fake' RTI by jumping to [RETI]
* to avoid clearing supervisor mode in child
*/
*/
r0 = [sp + PT_PC];
[sp + PT_P0] = r0;
RESTORE_ALL_SYS
p0 = reti;
jump (p0);
ENDPROC(_ret_from_fork)