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sparc32: drop sun4c window overflow stack checking routine

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Also drop run-time patching for srmmu

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2012-05-11 11:35:11 +00:00 committed by David S. Miller
parent 28de2f7339
commit 054768a132
2 changed files with 2 additions and 71 deletions
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72
arch/sparc/kernel/wof.S
View file

@ -163,9 +163,8 @@ spwin_fromuser:
* the label 'spwin_user_stack_is_bolixed' which will take
* care of things at that point.
*/
.globl spwin_mmu_patchme
spwin_mmu_patchme: b spwin_sun4c_stackchk
andcc %sp, 0x7, %g0
b spwin_srmmu_stackchk
andcc %sp, 0x7, %g0
spwin_good_ustack:
/* LOCATION: Window to be saved */
@ -306,73 +305,6 @@ spwin_bad_ustack_from_kernel:
* As noted above %curptr cannot be touched by this routine at all.
*/
spwin_sun4c_stackchk:
/* LOCATION: Window to be saved on the stack */
/* See if the stack is in the address space hole but first,
* check results of callers andcc %sp, 0x7, %g0
*/
be 1f
sra %sp, 29, %glob_tmp
rd %psr, %glob_tmp
b spwin_user_stack_is_bolixed + 0x4
nop
1:
add %glob_tmp, 0x1, %glob_tmp
andncc %glob_tmp, 0x1, %g0
be 1f
and %sp, 0xfff, %glob_tmp ! delay slot
rd %psr, %glob_tmp
b spwin_user_stack_is_bolixed + 0x4
nop
/* See if our dump area will be on more than one
* page.
*/
1:
add %glob_tmp, 0x38, %glob_tmp
andncc %glob_tmp, 0xff8, %g0
be spwin_sun4c_onepage ! only one page to check
lda [%sp] ASI_PTE, %glob_tmp ! have to check first page anyways
spwin_sun4c_twopages:
/* Is first page ok permission wise? */
srl %glob_tmp, 29, %glob_tmp
cmp %glob_tmp, 0x6
be 1f
add %sp, 0x38, %glob_tmp /* Is second page in vma hole? */
rd %psr, %glob_tmp
b spwin_user_stack_is_bolixed + 0x4
nop
1:
sra %glob_tmp, 29, %glob_tmp
add %glob_tmp, 0x1, %glob_tmp
andncc %glob_tmp, 0x1, %g0
be 1f
add %sp, 0x38, %glob_tmp
rd %psr, %glob_tmp
b spwin_user_stack_is_bolixed + 0x4
nop
1:
lda [%glob_tmp] ASI_PTE, %glob_tmp
spwin_sun4c_onepage:
srl %glob_tmp, 29, %glob_tmp
cmp %glob_tmp, 0x6 ! can user write to it?
be spwin_good_ustack ! success
nop
rd %psr, %glob_tmp
b spwin_user_stack_is_bolixed + 0x4
nop
/* This is a generic SRMMU routine. As far as I know this
* works for all current v8/srmmu implementations, we'll
* see...

1
arch/sparc/mm/srmmu.c
View file

@ -2144,7 +2144,6 @@ static void __init patch_window_trap_handlers(void)
{
unsigned long *iaddr, *daddr;
PATCH_BRANCH(spwin_mmu_patchme, spwin_srmmu_stackchk);
PATCH_BRANCH(tsetup_mmu_patchme, tsetup_srmmu_stackchk);
PATCH_BRANCH(rtrap_mmu_patchme, srmmu_rett_stackchk);
}