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Commit 1ec8cf62 authored by Sam Ravnborg's avatar Sam Ravnborg Committed by David S. Miller
Browse files

sparc32: introduce support for run-time patching for all shared assembler code 



All users of MMUREGS ASI in kernel/ now uses run-time patching.

Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Konrad Eisele <konrad@gaisler.com>
parent 080f8883

arch/sparc/kernel/entry.S

+5 −2
Original line number Diff line number Diff line
@@ -767,8 +767,11 @@ srmmu_fault: 
	mov	0x400, %l5

	mov	0x300, %l4



	lda	[%l5] ASI_M_MMUREGS, %l6	! read sfar first

	lda	[%l4] ASI_M_MMUREGS, %l5	! read sfsr last

LEON_PI(lda	[%l5] ASI_LEON_MMUREGS, %l6)	! read sfar first

SUN_PI_(lda	[%l5] ASI_M_MMUREGS, %l6)	! read sfar first



LEON_PI(lda	[%l4] ASI_LEON_MMUREGS, %l5)	! read sfsr last

SUN_PI_(lda	[%l4] ASI_M_MMUREGS, %l5)	! read sfsr last



	andn	%l6, 0xfff, %l6

	srl	%l5, 6, %l5			! and encode all info into l7

arch/sparc/kernel/etrap_32.S

+13 −5
Original line number Diff line number Diff line
@@ -234,7 +234,8 @@ tsetup_srmmu_stackchk: 


	cmp	%glob_tmp, %sp

	bleu,a	1f

	 lda	[%g0] ASI_M_MMUREGS, %glob_tmp		! read MMU control

LEON_PI( lda	[%g0] ASI_LEON_MMUREGS, %glob_tmp)	! read MMU control

SUN_PI_( lda	[%g0] ASI_M_MMUREGS, %glob_tmp)		! read MMU control



trap_setup_user_stack_is_bolixed:

	/* From user/kernel into invalid window w/bad user
@@ -249,18 +250,25 @@ trap_setup_user_stack_is_bolixed: 
1:

	/* Clear the fault status and turn on the no_fault bit. */

	or	%glob_tmp, 0x2, %glob_tmp		! or in no_fault bit

	sta	%glob_tmp, [%g0] ASI_M_MMUREGS		! set it

LEON_PI(sta	%glob_tmp, [%g0] ASI_LEON_MMUREGS)		! set it

SUN_PI_(sta	%glob_tmp, [%g0] ASI_M_MMUREGS)		! set it



	/* Dump the registers and cross fingers. */

	STORE_WINDOW(sp)



	/* Clear the no_fault bit and check the status. */

	andn	%glob_tmp, 0x2, %glob_tmp

	sta	%glob_tmp, [%g0] ASI_M_MMUREGS

LEON_PI(sta	%glob_tmp, [%g0] ASI_LEON_MMUREGS)

SUN_PI_(sta	%glob_tmp, [%g0] ASI_M_MMUREGS)



	mov	AC_M_SFAR, %glob_tmp

	lda	[%glob_tmp] ASI_M_MMUREGS, %g0

LEON_PI(lda	[%glob_tmp] ASI_LEON_MMUREGS, %g0)

SUN_PI_(lda	[%glob_tmp] ASI_M_MMUREGS, %g0)



	mov	AC_M_SFSR, %glob_tmp

	lda	[%glob_tmp] ASI_M_MMUREGS, %glob_tmp	! save away status of winstore

LEON_PI(lda	[%glob_tmp] ASI_LEON_MMUREGS, %glob_tmp)! save away status of winstore

SUN_PI_(lda	[%glob_tmp] ASI_M_MMUREGS, %glob_tmp)	! save away status of winstore



	andcc	%glob_tmp, 0x2, %g0			! did we fault?

	bne	trap_setup_user_stack_is_bolixed	! failure

	 nop

arch/sparc/kernel/rtrap_32.S

+12 −6
Original line number Diff line number Diff line
@@ -231,11 +231,14 @@ srmmu_rett_stackchk: 
	cmp	%g1, %fp

	bleu	ret_trap_user_stack_is_bolixed

	 mov	AC_M_SFSR, %g1

	lda	[%g1] ASI_M_MMUREGS, %g0

LEON_PI(lda	[%g1] ASI_LEON_MMUREGS, %g0)

SUN_PI_(lda	[%g1] ASI_M_MMUREGS, %g0)



	lda	[%g0] ASI_M_MMUREGS, %g1

LEON_PI(lda	[%g0] ASI_LEON_MMUREGS, %g1)

SUN_PI_(lda	[%g0] ASI_M_MMUREGS, %g1)

	or	%g1, 0x2, %g1

	sta	%g1, [%g0] ASI_M_MMUREGS

LEON_PI(sta	%g1, [%g0] ASI_LEON_MMUREGS)

SUN_PI_(sta	%g1, [%g0] ASI_M_MMUREGS)



	restore	%g0, %g0, %g0
@@ -244,13 +247,16 @@ srmmu_rett_stackchk: 
	save	%g0, %g0, %g0



	andn	%g1, 0x2, %g1

	sta	%g1, [%g0] ASI_M_MMUREGS

LEON_PI(sta	%g1, [%g0] ASI_LEON_MMUREGS)

SUN_PI_(sta	%g1, [%g0] ASI_M_MMUREGS)



	mov	AC_M_SFAR, %g2

	lda	[%g2] ASI_M_MMUREGS, %g2

LEON_PI(lda	[%g2] ASI_LEON_MMUREGS, %g2)

SUN_PI_(lda	[%g2] ASI_M_MMUREGS, %g2)



	mov	AC_M_SFSR, %g1

	lda	[%g1] ASI_M_MMUREGS, %g1

LEON_PI(lda	[%g1] ASI_LEON_MMUREGS, %g1)

SUN_PI_(lda	[%g1] ASI_M_MMUREGS, %g1)

	andcc	%g1, 0x2, %g0

	be	ret_trap_userwins_ok

	 nop

arch/sparc/kernel/wof.S

+12 −6
Original line number Diff line number Diff line
@@ -332,24 +332,30 @@ spwin_srmmu_stackchk: 
	 mov	AC_M_SFSR, %glob_tmp



	/* Clear the fault status and turn on the no_fault bit. */

	lda	[%glob_tmp] ASI_M_MMUREGS, %g0		! eat SFSR

LEON_PI(lda	[%glob_tmp] ASI_LEON_MMUREGS, %g0)	! eat SFSR

SUN_PI_(lda	[%glob_tmp] ASI_M_MMUREGS, %g0)		! eat SFSR



	lda	[%g0] ASI_M_MMUREGS, %glob_tmp		! read MMU control

LEON_PI(lda	[%g0] ASI_LEON_MMUREGS, %glob_tmp)	! read MMU control

SUN_PI_(lda	[%g0] ASI_M_MMUREGS, %glob_tmp)		! read MMU control

	or	%glob_tmp, 0x2, %glob_tmp		! or in no_fault bit

	sta	%glob_tmp, [%g0] ASI_M_MMUREGS		! set it

LEON_PI(sta	%glob_tmp, [%g0] ASI_LEON_MMUREGS)	! set it

SUN_PI_(sta	%glob_tmp, [%g0] ASI_M_MMUREGS)		! set it



	/* Dump the registers and cross fingers. */

	STORE_WINDOW(sp)



	/* Clear the no_fault bit and check the status. */

	andn	%glob_tmp, 0x2, %glob_tmp

	sta	%glob_tmp, [%g0] ASI_M_MMUREGS

LEON_PI(sta	%glob_tmp, [%g0] ASI_LEON_MMUREGS)

SUN_PI_(sta	%glob_tmp, [%g0] ASI_M_MMUREGS)



	mov	AC_M_SFAR, %glob_tmp

	lda	[%glob_tmp] ASI_M_MMUREGS, %g0

LEON_PI(lda	[%glob_tmp] ASI_LEON_MMUREGS, %g0)

SUN_PI_(lda	[%glob_tmp] ASI_M_MMUREGS, %g0)



	mov	AC_M_SFSR, %glob_tmp

	lda	[%glob_tmp] ASI_M_MMUREGS, %glob_tmp

LEON_PI(lda	[%glob_tmp] ASI_LEON_MMUREGS, %glob_tmp)

SUN_PI_(lda	[%glob_tmp] ASI_M_MMUREGS, %glob_tmp)

	andcc	%glob_tmp, 0x2, %g0			! did we fault?

	be,a	spwin_finish_up + 0x4			! cool beans, success

	 restore %g0, %g0, %g0

arch/sparc/kernel/wuf.S

+17 −10
Original line number Diff line number Diff line
@@ -254,16 +254,19 @@ srmmu_fwin_stackchk: 
	mov	AC_M_SFSR, %l4

	cmp	%l5, %sp

	bleu	fwin_user_stack_is_bolixed

	 lda	[%l4] ASI_M_MMUREGS, %g0	! clear fault status

LEON_PI( lda	[%l4] ASI_LEON_MMUREGS, %g0)	! clear fault status

SUN_PI_( lda	[%l4] ASI_M_MMUREGS, %g0)	! clear fault status



	/* The technique is, turn off faults on this processor,

	 * just let the load rip, then check the sfsr to see if

	 * a fault did occur.  Then we turn on fault traps again

	 * and branch conditionally based upon what happened.

	 */

	lda	[%g0] ASI_M_MMUREGS, %l5	! read mmu-ctrl reg

LEON_PI(lda	[%g0] ASI_LEON_MMUREGS, %l5)	! read mmu-ctrl reg

SUN_PI_(lda	[%g0] ASI_M_MMUREGS, %l5)	! read mmu-ctrl reg

	or	%l5, 0x2, %l5			! turn on no-fault bit

	sta	%l5, [%g0] ASI_M_MMUREGS	! store it

LEON_PI(sta	%l5, [%g0] ASI_LEON_MMUREGS)	! store it

SUN_PI_(sta	%l5, [%g0] ASI_M_MMUREGS)	! store it



	/* Cross fingers and go for it. */

	LOAD_WINDOW(sp)
@@ -275,15 +278,19 @@ srmmu_fwin_stackchk: 


	/* LOCATION: Window 'T' */



	lda	[%g0] ASI_M_MMUREGS, %twin_tmp1	! load mmu-ctrl again

LEON_PI(lda	[%g0] ASI_LEON_MMUREGS, %twin_tmp1)	! load mmu-ctrl again

SUN_PI_(lda	[%g0] ASI_M_MMUREGS, %twin_tmp1)	! load mmu-ctrl again

	andn	%twin_tmp1, 0x2, %twin_tmp1		! clear no-fault bit

	sta	%twin_tmp1, [%g0] ASI_M_MMUREGS	! store it

LEON_PI(sta	%twin_tmp1, [%g0] ASI_LEON_MMUREGS)	! store it

SUN_PI_(sta	%twin_tmp1, [%g0] ASI_M_MMUREGS)	! store it



	mov	AC_M_SFAR, %twin_tmp2

	lda	[%twin_tmp2] ASI_M_MMUREGS, %g0	! read fault address

LEON_PI(lda	[%twin_tmp2] ASI_LEON_MMUREGS, %g0)	! read fault address

SUN_PI_(lda	[%twin_tmp2] ASI_M_MMUREGS, %g0)	! read fault address



	mov	AC_M_SFSR, %twin_tmp2

	lda	[%twin_tmp2] ASI_M_MMUREGS, %twin_tmp2	! read fault status

LEON_PI(lda	[%twin_tmp2] ASI_LEON_MMUREGS, %twin_tmp2) ! read fault status

SUN_PI_(lda	[%twin_tmp2] ASI_M_MMUREGS, %twin_tmp2)	   ! read fault status

	andcc	%twin_tmp2, 0x2, %g0			   ! did fault occur?



	bne	1f					   ! yep, cleanup