Commit 054768a1 authored by Sam Ravnborg's avatar Sam Ravnborg Committed by David S. Miller
Browse files

sparc32: drop sun4c window overflow stack checking routine 



Also drop run-time patching for srmmu

Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 28de2f73

arch/sparc/kernel/wof.S

+2 −70
Original line number Diff line number Diff line
@@ -163,8 +163,7 @@ 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

	b	spwin_srmmu_stackchk

	 andcc	%sp, 0x7, %g0



spwin_good_ustack:
@@ -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...

arch/sparc/mm/srmmu.c

+0 −1
Original line number Diff line number Diff line
@@ -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);

}