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From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-mm@kvack.org
Subject: [PATCH v4 12/16] powerpc/8xx: split breakpoint exception
Date: Tue, 26 Nov 2019 12:36:16 +0000 (UTC)	[thread overview]
Message-ID: <f9f926326ed150b2ab24ce362b14d97b76db7176.1574771541.git.christophe.leroy@c-s.fr> (raw)
In-Reply-To: <cover.1574771539.git.christophe.leroy@c-s.fr>

Breakpoint exception is big.

Split it to support future growth on exception prolog.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/kernel/head_8xx.S | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 1e718e47fe3c..225e242ce1c5 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -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
-- 
2.13.3


  parent reply	other threads:[~2019-11-26 12:36 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-26 12:36 [PATCH v4 00/16] Enable CONFIG_VMAP_STACK on PPC32 Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 01/16] powerpc/32: replace MTMSRD() by mtmsr Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 02/16] powerpc/32: Add EXCEPTION_PROLOG_0 in head_32.h Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 03/16] powerpc/32: save DEAR/DAR before calling handle_page_fault Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 04/16] powerpc/32: move MSR_PR test into EXCEPTION_PROLOG_0 Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 05/16] powerpc/32: add a macro to get and/or save DAR and DSISR on stack Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 06/16] powerpc/32: prepare for CONFIG_VMAP_STACK Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 07/16] powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 08/16] powerpc/32: Add early stack overflow detection with VMAP stack Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 09/16] powerpc/8xx: Use alternative scratch registers in DTLB miss handler Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 10/16] powerpc/8xx: drop exception entries for non-existing exceptions Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 11/16] powerpc/8xx: move DataStoreTLBMiss perf handler Christophe Leroy
2019-11-26 12:36 ` Christophe Leroy [this message]
2019-11-26 12:36 ` [PATCH v4 13/16] powerpc/8xx: Enable CONFIG_VMAP_STACK Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 14/16] powerpc/32s: reorganise DSI handler Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 15/16] powerpc/32s: avoid crossing page boundary while changing SRR0/1 Christophe Leroy
2019-11-26 12:36 ` [PATCH v4 16/16] powerpc/32s: Activate CONFIG_VMAP_STACK Christophe Leroy

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