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Subject[RFC PATCH v1 32/41] powerpc/32: Refactor saving of volatile registers in exception prologs
Date
Exception prologs all do the same at the end:
- Save trapno in stack
- Mark stack with exception marker
- Save r0
- Save r3 to r8

Refactor that into a COMMON_EXCEPTION_PROLOG_END macro.
At the same time use r1 instead of r11.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/head_32.h | 14 +++++++++-----
arch/powerpc/kernel/head_40x.S | 9 +--------
arch/powerpc/kernel/head_booke.h | 26 +++++++++++++-------------
3 files changed, 23 insertions(+), 26 deletions(-)

diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 84e6251622e8..12c39178a1d2 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -104,14 +104,18 @@
li r10, MSR_KERNEL /* can take exceptions */
mtmsr r10 /* (except for mach check in rtas) */
#endif
- stw r0,GPR0(r11)
+ COMMON_EXCEPTION_PROLOG_END \trapno
+.endm
+
+.macro COMMON_EXCEPTION_PROLOG_END trapno
+ stw r0,GPR0(r1)
lis r10,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
addi r10,r10,STACK_FRAME_REGS_MARKER@l
- stw r10,8(r11)
+ stw r10,8(r1)
li r10, \trapno
- stw r10,_TRAP(r11)
- SAVE_4GPRS(3, r11)
- SAVE_2GPRS(7, r11)
+ stw r10,_TRAP(r1)
+ SAVE_4GPRS(3, r1)
+ SAVE_2GPRS(7, r1)
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 52b40bf529c6..e1360b88b6cb 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -157,14 +157,7 @@ _ENTRY(crit_esr)
mfspr r12,SPRN_SRR2
mfspr r9,SPRN_SRR3
rlwinm r9,r9,0,14,12 /* clear MSR_WE (necessary?) */
- stw r0,GPR0(r11)
- lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
- addi r10, r10, STACK_FRAME_REGS_MARKER@l
- stw r10, 8(r11)
- li r10, \trapno + 2
- stw r10,_TRAP(r11)
- SAVE_4GPRS(3, r11)
- SAVE_2GPRS(7, r11)
+ COMMON_EXCEPTION_PROLOG_END \trapno + 2
_ASM_NOKPROBE_SYMBOL(\name\()_virt)
.endm

diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 7c8195ae95c4..7e47b5dfdd9c 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -78,14 +78,18 @@ END_BTB_FLUSH_SECTION
stw r1, 0(r11); \
mr r1, r11; \
rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- stw r0,GPR0(r11); \
- lis r10, STACK_FRAME_REGS_MARKER@ha;/* exception frame marker */ \
- addi r10, r10, STACK_FRAME_REGS_MARKER@l; \
- stw r10, 8(r11); \
- li r10, trapno; \
- stw r10,_TRAP(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
+ COMMON_EXCEPTION_PROLOG_END trapno
+
+.macro COMMON_EXCEPTION_PROLOG_END trapno
+ stw r0,GPR0(r1)
+ lis r10, STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
+ addi r10, r10, STACK_FRAME_REGS_MARKER@l
+ stw r10, 8(r1)
+ li r10, trapno
+ stw r10,_TRAP(r1)
+ SAVE_4GPRS(3, r1)
+ SAVE_2GPRS(7, r1)
+.end

.macro prepare_transfer_to_handler
bl prepare_transfer_to_handler
@@ -231,11 +235,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_EMB_HV)
stw r1,0(r11); \
mr r1,r11; \
rlwinm r9,r9,0,14,12; /* clear MSR_WE (necessary?) */\
- li r10, trapno; \
- stw r10,_TRAP(r11); \
- stw r0,GPR0(r11); \
- SAVE_4GPRS(3, r11); \
- SAVE_2GPRS(7, r11)
+ COMMON_EXCEPTION_PROLOG_END trapno

.macro SAVE_xSRR xSRR
mfspr r0,SPRN_\xSRR\()0
--
2.25.0
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