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xtensa: move invalid unaligned instruction handler closer to its users 

With this change a threaded jump from .Linvalid_instruction_load to
.Linvalid_instruction can be removed and more code may be added to
common load/store exit path.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2014-08-04 15:24:58 +04:00
parent e9500dd852
commit 21570465a3
1 changed files with 29 additions and 33 deletions
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62
arch/xtensa/kernel/align.S
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@ -230,10 +230,6 @@ ENTRY(fast_unaligned)
addx8 a5, a6, a5
jx a5 # jump into table
/* Invalid instruction, CRITICAL! */
.Linvalid_instruction_load:
j .Linvalid_instruction
/* Load: Load memory address. */
.Lload: movi a3, ~3
@ -319,6 +315,35 @@ ENTRY(fast_unaligned)
mov a3, a14 ; _j 1f; .align 8
mov a3, a15 ; _j 1f; .align 8
/* We cannot handle this exception. */
.extern _kernel_exception
.Linvalid_instruction_load:
.Linvalid_instruction_store:
movi a4, 0
rsr a3, excsave1
s32i a4, a3, EXC_TABLE_FIXUP
/* Restore a4...a8 and SAR, set SP, and jump to default exception. */
l32i a8, a2, PT_AREG8
l32i a7, a2, PT_AREG7
l32i a6, a2, PT_AREG6
l32i a5, a2, PT_AREG5
l32i a4, a2, PT_AREG4
wsr a0, sar
mov a1, a2
rsr a0, ps
bbsi.l a0, PS_UM_BIT, 2f # jump if user mode
movi a0, _kernel_exception
jx a0
2: movi a0, _user_exception
jx a0
1: # a7: instruction pointer, a4: instruction, a3: value
movi a6, 0 # mask: ffffffff:00000000
@ -416,35 +441,6 @@ ENTRY(fast_unaligned)
l32i a2, a2, PT_AREG2
rfe
/* We cannot handle this exception. */
.extern _kernel_exception
.Linvalid_instruction_store:
.Linvalid_instruction:
movi a4, 0
rsr a3, excsave1
s32i a4, a3, EXC_TABLE_FIXUP
/* Restore a4...a8 and SAR, set SP, and jump to default exception. */
l32i a8, a2, PT_AREG8
l32i a7, a2, PT_AREG7
l32i a6, a2, PT_AREG6
l32i a5, a2, PT_AREG5
l32i a4, a2, PT_AREG4
wsr a0, sar
mov a1, a2
rsr a0, ps
bbsi.l a0, PS_UM_BIT, 1f # jump if user mode
movi a0, _kernel_exception
jx a0
1: movi a0, _user_exception
jx a0
ENDPROC(fast_unaligned)
ENTRY(fast_unaligned_fixup)