Restore all SPRs and CR up-front, these are longer latency
instructions. Move register restore around to maximise pairs of
adjacent loads (e.g., restore r0 next to r1).
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
arch/powerpc/kernel/exceptions-64s.S | 40 +++++++++++-----------------
1 file changed, 16 insertions(+), 24 deletions(-)
diff --git a/arch/powerpc/kernel/exceptions-64s.S
b/arch/powerpc/kernel/exceptions-64s.S
index 17bc0166e0e6..228fa51b9050 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -917,13 +917,11 @@ EXC_COMMON_BEGIN(system_reset_common)
mtxer r9
ld r9,_LINK(r1)
mtlr r9
- REST_GPR(0, r1)
+ ld r9,_CCR(r1)
+ mtcr r9
REST_8GPRS(2, r1)
- REST_GPR(10, r1)
- ld r11,_CCR(r1)
- mtcr r11
- REST_GPR(11, r1)
- REST_2GPRS(12, r1)
+ REST_4GPRS(10, r1)
+ REST_GPR(0, r1)
/* restore original r1. */
ld r1,GPR1(r1)
RFI_TO_USER_OR_KERNEL
@@ -1095,13 +1093,11 @@ EXC_COMMON_BEGIN(machine_check_common)
mtxer r9; \
ld r9,_LINK(r1); \
mtlr r9; \
- REST_GPR(0, r1); \
+ ld r9,_CCR(r1); \
+ mtcr r9; \
REST_8GPRS(2, r1); \
- REST_GPR(10, r1); \
- ld r11,_CCR(r1); \
- mtcr r11; \
- REST_GPR(11, r1); \
- REST_2GPRS(12, r1); \
+ REST_4GPRS(10, r1); \
+ REST_GPR(0, r1); \
/* restore original r1. */ \
ld r1,GPR1(r1)
@@ -1795,13 +1791,11 @@ TRAMP_REAL_BEGIN(hmi_exception_early)
mtxer r9
ld r9,_LINK(r1)
mtlr r9
- REST_GPR(0, r1)
+ ld r9,_CCR(r1)
+ mtcr r9
REST_8GPRS(2, r1)
- REST_GPR(10, r1)
- ld r11,_CCR(r1)
- REST_2GPRS(12, r1)
- mtcr r11
- REST_GPR(11, r1)
+ REST_4GPRS(10, r1)
+ REST_GPR(0, r1)
ld r1,GPR1(r1)
HRFI_TO_USER_OR_KERNEL
@@ -1816,13 +1810,11 @@ TRAMP_REAL_BEGIN(hmi_exception_early)
mtxer r9
ld r9,_LINK(r1)
mtlr r9
- REST_GPR(0, r1)
+ ld r9,_CCR(r1)
+ mtcr r9
REST_8GPRS(2, r1)
- REST_GPR(10, r1)
- ld r11,_CCR(r1)
- REST_2GPRS(12, r1)
- mtcr r11
- REST_GPR(11, r1)
+ REST_4GPRS(10, r1)
+ REST_GPR(0, r1)
ld r1,GPR1(r1)
/*
--
2.20.1
