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| author | Nicholas Piggin | 2019-06-28 07:33:26 +0200 |
|---|---|---|
| committer | Michael Ellerman | 2019-07-02 13:39:48 +0200 |
| commit | b113c083414ed91c116483ebe74fb20c8b1ddcd3 (patch) | |
| tree | d37ec3d7c4c6dfe5e6b17f6ad2f80ce771993c12 /arch/powerpc/kernel | |
| parent | powerpc/64s/exception: simplify hmi windup code (diff) | |
| download | kernel-qcow2-linux-b113c083414ed91c116483ebe74fb20c8b1ddcd3.tar.gz kernel-qcow2-linux-b113c083414ed91c116483ebe74fb20c8b1ddcd3.tar.xz kernel-qcow2-linux-b113c083414ed91c116483ebe74fb20c8b1ddcd3.zip | |
powerpc/64s/exception: shuffle windup code around
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 <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 40 |
1 files changed, 16 insertions, 24 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index cbed1e42d85c..b5060824303b 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) /* |