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cortex-m0: add more thumb1 helpers

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Add other helpers for compact switch on ARMv6-M.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

BRANCH=none
BUG=none
TEST=none

Change-Id: I711ee8361ff1545acd978974d9f9fc306ca43b78
Reviewed-on: https://chromium-review.googlesource.com/190711
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
This commit is contained in:
Vincent Palatin
2014-03-17 17:30:36 -07:00
committed by chrome-internal-fetch
parent 13634cbb50
commit 2dc7016541
1 changed files with 53 additions and 11 deletions
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64
core/cortex-m0/thumb_case.S
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@@ -13,10 +13,10 @@
.code 16
/*
* Helper for compact switch
* Helpers for compact switch
*
* r0: the table index
* lr: the table base address
* lr: the table base address (need to clear bit 0)
*
* r0 and lr must be PRESERVED.
* r12 can be clobbered.
@@ -24,12 +24,54 @@
.global __gnu_thumb1_case_uqi
.thumb_func
__gnu_thumb1_case_uqi:
push {r1}
mov r1, lr
lsrs r1, r1, #1
lsls r1, r1, #1
ldrb r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
pop {r1}
bx lr
mov r12, r1
mov r1, lr
lsrs r1, r1, #1
lsls r1, r1, #1
ldrb r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
mov r1, r12
bx lr
.global __gnu_thumb1_case_sqi
.thumb_func
__gnu_thumb1_case_sqi:
mov r12, r1
mov r1, lr
lsrs r1, r1, #1
lsls r1, r1, #1
ldrsb r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
mov r1, r12
bx lr
.global __gnu_thumb1_case_uhi
.thumb_func
__gnu_thumb1_case_uhi:
push {r0, r1}
mov r1, lr
lsrs r1, r1, #1
lsls r0, r0, #1
lsls r1, r1, #1
ldrh r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
pop {r0, r1}
bx lr
.global __gnu_thumb1_case_shi
.thumb_func
__gnu_thumb1_case_shi:
push {r0, r1}
mov r1, lr
lsrs r1, r1, #1
lsls r0, r0, #1
lsls r1, r1, #1
ldrsh r1, [r1, r0]
lsls r1, r1, #1
add lr, lr, r1
pop {r0, r1}
bx lr