From d73a10cbf98f868586e907ef9d953f9fc7ae369c Mon Sep 17 00:00:00 2001
From: Nicholas Piggin <npiggin@gmail.com>
Date: Wed, 26 Feb 2020 03:35:22 +1000
Subject: [PATCH] powerpc/64s/exception: Remove confusing IEARLY option
References: jsc#SLE-9246
Patch-mainline: v5.7-rc1
Git-commit: d73a10cbf98f868586e907ef9d953f9fc7ae369c
Replace IEARLY=1 and IEARLY=2 with IBRANCH_COMMON, which controls if
the entry code branches to a common handler; and IREALMODE_COMMON,
which controls whether the common handler should remain in real mode.
These special cases no longer avoid loading the SRR registers, there
is no point as most of them load the registers immediately anyway.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225173541.1549955-14-npiggin@gmail.com
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/kernel/exceptions-64s.S | 49 ++++++++++++++--------------
1 file changed, 24 insertions(+), 25 deletions(-)
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 1bc73acceb9a..36096043164d 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -174,7 +174,8 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
#define IDAR .L_IDAR_\name\()
#define IDSISR .L_IDSISR_\name\()
#define ISET_RI .L_ISET_RI_\name\()
-#define IEARLY .L_IEARLY_\name\()
+#define IBRANCH_TO_COMMON .L_IBRANCH_TO_COMMON_\name\()
+#define IREALMODE_COMMON .L_IREALMODE_COMMON_\name\()
#define IMASK .L_IMASK_\name\()
#define IKVM_SKIP .L_IKVM_SKIP_\name\()
#define IKVM_REAL .L_IKVM_REAL_\name\()
@@ -218,8 +219,15 @@ do_define_int n
.ifndef ISET_RI
ISET_RI=1
.endif
- .ifndef IEARLY
- IEARLY=0
+ .ifndef IBRANCH_TO_COMMON
+ IBRANCH_TO_COMMON=1
+ .endif
+ .ifndef IREALMODE_COMMON
+ IREALMODE_COMMON=0
+ .else
+ .if ! IBRANCH_TO_COMMON
+ .error "IREALMODE_COMMON=1 but IBRANCH_TO_COMMON=0"
+ .endif
.endif
.ifndef IMASK
IMASK=0
@@ -353,6 +361,11 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
*/
.macro GEN_BRANCH_TO_COMMON name, virt
+ .if IREALMODE_COMMON
+ LOAD_HANDLER(r10, \name\()_common)
+ mtctr r10
+ bctr
+ .else
.if \virt
#ifndef CONFIG_RELOCATABLE
b \name\()_common_virt
@@ -366,6 +379,7 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
mtctr r10
bctr
.endif
+ .endif
.endm
.macro GEN_INT_ENTRY name, virt, ool=0
@@ -421,11 +435,6 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
stw r10,IAREA+EX_DSISR(r13)
.endif
- .if IEARLY == 2
- /* nothing more */
- .elseif IEARLY
- BRANCH_TO_C000(r11, \name\()_common)
- .else
.if IHSRR == EXC_HV_OR_STD
BEGIN_FTR_SECTION
mfspr r11,SPRN_HSRR0 /* save HSRR0 */
@@ -441,6 +450,8 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
mfspr r11,SPRN_SRR0 /* save SRR0 */
mfspr r12,SPRN_SRR1 /* and SRR1 */
.endif
+
+ .if IBRANCH_TO_COMMON
GEN_BRANCH_TO_COMMON \name \virt
.endif
@@ -940,6 +951,7 @@ INT_DEFINE_BEGIN(machine_check_early)
IVEC=0x200
IAREA=PACA_EXMC
IVIRT=0 /* no virt entry point */
+ IREALMODE_COMMON=1
/*
* MSR_RI is not enabled, because PACA_EXMC is being used, so a
* nested machine check corrupts it. machine_check_common enables
@@ -947,7 +959,6 @@ INT_DEFINE_BEGIN(machine_check_early)
*/
ISET_RI=0
ISTACK=0
- IEARLY=1
IDAR=1
IDSISR=1
IRECONCILE=0
@@ -987,9 +998,6 @@ TRAMP_REAL_BEGIN(machine_check_fwnmi)
EXCEPTION_RESTORE_REGS EXC_STD
EXC_COMMON_BEGIN(machine_check_early_common)
- mfspr r11,SPRN_SRR0
- mfspr r12,SPRN_SRR1
-
__GEN_REALMODE_COMMON_ENTRY machine_check_early
/*
@@ -1825,7 +1833,7 @@ EXC_COMMON_BEGIN(emulation_assist_common)
INT_DEFINE_BEGIN(hmi_exception_early)
IVEC=0xe60
IHSRR=EXC_HV
- IEARLY=1
+ IREALMODE_COMMON=1
ISTACK=0
IRECONCILE=0
IKUAP=0 /* We don't touch AMR here, we never go to virtual mode */
@@ -1845,9 +1853,6 @@ EXC_REAL_END(hmi_exception, 0xe60, 0x20)
EXC_VIRT_NONE(0x4e60, 0x20)
EXC_COMMON_BEGIN(hmi_exception_early_common)
- mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
- mfspr r12,SPRN_HSRR1 /* Save HSRR1 */
-
__GEN_REALMODE_COMMON_ENTRY hmi_exception_early
mr r10,r1 /* Save r1 */
@@ -2175,29 +2180,23 @@ EXC_VIRT_NONE(0x5400, 0x100)
INT_DEFINE_BEGIN(denorm_exception)
IVEC=0x1500
IHSRR=EXC_HV
- IEARLY=2
+ IBRANCH_TO_COMMON=0
IKVM_REAL=1
INT_DEFINE_END(denorm_exception)
EXC_REAL_BEGIN(denorm_exception, 0x1500, 0x100)
GEN_INT_ENTRY denorm_exception, virt=0
#ifdef CONFIG_PPC_DENORMALISATION
- mfspr r10,SPRN_HSRR1
- andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
+ andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */
bne+ denorm_assist
#endif
- mfspr r11,SPRN_HSRR0
- mfspr r12,SPRN_HSRR1
GEN_BRANCH_TO_COMMON denorm_exception, virt=0
EXC_REAL_END(denorm_exception, 0x1500, 0x100)
#ifdef CONFIG_PPC_DENORMALISATION
EXC_VIRT_BEGIN(denorm_exception, 0x5500, 0x100)
GEN_INT_ENTRY denorm_exception, virt=1
- mfspr r10,SPRN_HSRR1
- andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
+ andis. r10,r12,(HSRR1_DENORM)@h /* denorm? */
bne+ denorm_assist
- mfspr r11,SPRN_HSRR0
- mfspr r12,SPRN_HSRR1
GEN_BRANCH_TO_COMMON denorm_exception, virt=1
EXC_VIRT_END(denorm_exception, 0x5500, 0x100)
#else
--
2.28.0