diff options
| author | Alexey Brodkin <Alexey.Brodkin@synopsys.com> | 2019-07-16 23:50:34 +0300 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2019-08-05 12:31:29 +0530 |
| commit | 97abfd5d801abb6eac35e2d7d725123950e2153d (patch) | |
| tree | 0f8fbf09c423fc8a533cf4549aa1722ed15c1c12 /arch/arc | |
| parent | 5f9e832c137075045d15cd6899ab0505cfb2ca4b (diff) | |
ARCv2: entry: early return from exception need not clear U & DE bits
Exception handlers call FAKE_RET_FROM_EXCPN to
- clear AE bit: drop down from exception active to pure kernel mode
allowing further excptions
- set IE bit: re-enable interrupts
It additionally also clears U bit (user mode) and DE bit (delay slot
execution) which is redundant as hardware does that already on any taken
exception. Morevoer the current software clearing is bogus anyways as
the KFLAG instruction being used for purpose can't possibly write those
bits anyways.
So don't pretend to clear them.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: rewrote changelog]
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/entry-arcv2.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h index f5ae394ebe06..41b16f21beec 100644 --- a/arch/arc/include/asm/entry-arcv2.h +++ b/arch/arc/include/asm/entry-arcv2.h @@ -256,7 +256,7 @@ .macro FAKE_RET_FROM_EXCPN lr r9, [status32] - bic r9, r9, (STATUS_U_MASK|STATUS_DE_MASK|STATUS_AE_MASK) + bic r9, r9, STATUS_AE_MASK or r9, r9, STATUS_IE_MASK kflag r9 .endm |