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sparc64: Fix recursion in stack overflow detection handling.

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The calls down into prom_printf() when we detect an overflowed stack
can recurse again since the overflow stack will be "below" the current
kernel stack limit.

Prevent this by just returning straight if we are on the stack
overflow safe stack already.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-08-12 02:03:49 -07:00
parent c6ed413ddc
commit c7498081a6
1 changed files with 14 additions and 3 deletions
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17
arch/sparc64/lib/mcount.S
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@ -48,12 +48,23 @@ mcount:
sub %g3, STACK_BIAS, %g3
cmp %sp, %g3
bg,pt %xcc, 1f
sethi %hi(panicstring), %g3
nop
/* If we are already on ovstack, don't hop onto it
* again, we are already trying to output the stack overflow
* message.
*/
sethi %hi(ovstack), %g7 ! cant move to panic stack fast enough
or %g7, %lo(ovstack), %g7
add %g7, OVSTACKSIZE, %g7
add %g7, OVSTACKSIZE, %g3
sub %g3, STACK_BIAS + 192, %g3
sub %g7, STACK_BIAS, %g7
mov %g7, %sp
cmp %sp, %g7
blu,pn %xcc, 2f
cmp %sp, %g3
bleu,pn %xcc, 1f
nop
2: mov %g3, %sp
sethi %hi(panicstring), %g3
call prom_printf
or %g3, %lo(panicstring), %o0
call prom_halt