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| author | Vineet Gupta <vgupta@kernel.org> | 2020-06-17 16:23:38 -0700 |
|---|---|---|
| committer | Vineet Gupta <vgupta@kernel.org> | 2023-08-18 10:30:47 -0700 |
| commit | dfb12071dda4e28aea82d06bf9c01c403f6d0f30 (patch) | |
| tree | 9755da769ce96c66d5d072dfbcab1dcaff2e36df /scripts/rustdoc_test_builder.rs | |
| parent | 13347c10396055c4c6c38a54d10bc6ed5024fbe9 (diff) | |
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 'scripts/rustdoc_test_builder.rs')
0 files changed, 0 insertions, 0 deletions