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| author | Vineet Gupta <vgupta@kernel.org> | 2020-06-18 01:23:38 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@kernel.org> | 2023-08-18 19:30:47 +0200 |
| commit | dfb12071dda4e28aea82d06bf9c01c403f6d0f30 (patch) | |
| tree | 9755da769ce96c66d5d072dfbcab1dcaff2e36df /arch/arc/include | |
| parent | ARC: entry: Add more common chores to EXCEPTION_PROLOGUE (diff) | |
| download | linux-dfb12071dda4e28aea82d06bf9c01c403f6d0f30.tar.xz linux-dfb12071dda4e28aea82d06bf9c01c403f6d0f30.zip | |
ARC: entry: replace 8 byte OR with 4 byte BSET
FAKE_RET_FROM_EXCEPTION drops down to pure kernel mode. It currently has
an 8 byte instruction which can be replaced with 4 byte BSET
This is applicable to both ARCv2 and ARCv3 entr code.
ARCv2 current
------------
00000804 <EV_Trap>:
...
874: 216a 1280 lr r9,[status32]
878: 2146 1809 bic r9,r9,0x20
87c: 2105 1f89 8000 0000 or r9,r9,0x80000000
^^^^^^^^^
884: 2029 8240 kflag r9
ARCv2 after
----------
000007e0 <EV_Trap>:
...
850: 216a 1280 lr r9,[status32]
854: 2150 1149 bclr r9,r9,0x5
858: 214f 17c9 bset r9,r9,0x1f
85c: 2029 8240 kflag r9
Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Diffstat (limited to 'arch/arc/include')
| -rw-r--r-- | arch/arc/include/asm/entry-arcv2.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h index 11b48ab39154..f7c9b3915d10 100644 --- a/arch/arc/include/asm/entry-arcv2.h +++ b/arch/arc/include/asm/entry-arcv2.h @@ -274,8 +274,8 @@ .macro FAKE_RET_FROM_EXCPN lr r9, [status32] - bic r9, r9, STATUS_AE_MASK - or r9, r9, STATUS_IE_MASK + bclr r9, r9, STATUS_AE_BIT + bset r9, r9, STATUS_IE_BIT kflag r9 .endm |