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| author | Vincent Palatin <vpalatin@chromium.org> | 2014-03-17 17:30:36 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-04-11 20:02:07 +0000 |
| commit | 2dc7016541daf1bf7e9e96131eced09fe6a94776 (patch) | |
| tree | 78e5d2ffdffc52cd708192d3299eac7ea8667a83 | |
| parent | 13634cbb50c457fec8f67f99b696bad3d3bef944 (diff) | |
| download | chrome-ec-2dc7016541daf1bf7e9e96131eced09fe6a94776.tar.gz | |
cortex-m0: add more thumb1 helpers
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>
| -rw-r--r-- | core/cortex-m0/thumb_case.S | 64 |
1 files changed, 53 insertions, 11 deletions
diff --git a/core/cortex-m0/thumb_case.S b/core/cortex-m0/thumb_case.S index 1229988d9f..be6c02b764 100644 --- a/core/cortex-m0/thumb_case.S +++ b/core/cortex-m0/thumb_case.S @@ -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 |