Commit afe1ec5a authored by Christophe Leroy's avatar Christophe Leroy Committed by Michael Ellerman
Browse files

powerpc/8xx: Split breakpoint exception 



Breakpoint exception is big.

Split it to support future growth on exception prolog.

Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1dda3293d86d0f715b13b2633c95d2188a42a02c.1576916812.git.christophe.leroy@c-s.fr
parent 596419af

arch/powerpc/kernel/head_8xx.S

+10 −9
Original line number Diff line number Diff line
@@ -490,14 +490,7 @@ DARFixed:/* Return from dcbx instruction bug workaround */ 
 * support of breakpoints and such.  Someday I will get around to

 * using them.

 */

	. = 0x1c00

DataBreakpoint:

	EXCEPTION_PROLOG_0

	mfspr	r11, SPRN_SRR0

	cmplwi	cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l

	cmplwi	cr7, r11, (.Litlbie - PAGE_OFFSET)@l

	beq-	cr1, 11f

	beq-	cr7, 11f

do_databreakpoint:

	EXCEPTION_PROLOG_1

	EXCEPTION_PROLOG_2

	addi	r3,r1,STACK_FRAME_OVERHEAD
@@ -505,7 +498,15 @@ DataBreakpoint: 
	stw	r4,_DAR(r11)

	mfspr	r5,SPRN_DSISR

	EXC_XFER_STD(0x1c00, do_break)

11:



	. = 0x1c00

DataBreakpoint:

	EXCEPTION_PROLOG_0

	mfspr	r11, SPRN_SRR0

	cmplwi	cr1, r11, (.Ldtlbie - PAGE_OFFSET)@l

	cmplwi	cr7, r11, (.Litlbie - PAGE_OFFSET)@l

	cror	4*cr1+eq, 4*cr1+eq, 4*cr7+eq

	bne	cr1, do_databreakpoint

	mtcr	r10

	mfspr	r10, SPRN_SPRG_SCRATCH0

	mfspr	r11, SPRN_SPRG_SCRATCH1

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