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author | Nicolas Boichat <drinkcat@chromium.org> | 2019-05-09 14:15:36 +0900 |
---|---|---|
committer | Commit Bot <commit-bot@chromium.org> | 2020-03-25 02:13:31 +0000 |
commit | 509f29d6ce3d684f4c21a02f49f76e08353110f1 (patch) | |
tree | 8046062a964262b2f2c6cba44c611066ac250feb /core/cortex-m0/div.S | |
parent | c830ecc1f728b722fde24a5da14a89f9223f291c (diff) | |
download | chrome-ec-509f29d6ce3d684f4c21a02f49f76e08353110f1.tar.gz |
core/cortex-m[0]: Move core functions assembly files to third_party
The code originally comes from libaeabi-cortexm0. It is unclear
which exact git commit the code comes from, but since we have used
it without issue for 5 years, it is reliable, and a refresh is
probably not required at this stage.
BRANCH=none
BUG=chromium:884905
TEST=make buildall -j, which also include basic tests.
Change-Id: I910c1c4e6a46b2f0fe8b7a429f1b6f0f50c2dc21
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1599762
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Diffstat (limited to 'core/cortex-m0/div.S')
l---------[-rw-r--r--] | core/cortex-m0/div.S | 167 |
1 files changed, 1 insertions, 166 deletions
diff --git a/core/cortex-m0/div.S b/core/cortex-m0/div.S index 898ecafe83..776b7d2405 100644..120000 --- a/core/cortex-m0/div.S +++ b/core/cortex-m0/div.S @@ -1,166 +1 @@ -/* Runtime ABI for the ARM Cortex-M0 - * idiv.S: signed 32 bit division (only quotient) - * idivmod.S: signed 32 bit division (quotient and remainder) - * uidivmod.S: unsigned 32 bit division - * - * Copyright (c) 2012 Jörg Mische <bobbl@gmx.de> - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT - * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ - -#include "software_panic.h" - - - .syntax unified - .text - .thumb - .cpu cortex-m0 - -@ int __aeabi_idiv(int num:r0, int denom:r1) -@ -@ Divide r0 by r1 and return quotient in r0 (all signed). -@ Use __aeabi_uidivmod() but check signs before and change signs afterwards. -@ - .thumb_func - .section .text.__aeabi_idiv - .global __aeabi_idiv -__aeabi_idiv: - - cmp r0, #0 - bge L_num_pos - - rsbs r0, r0, #0 @ num = -num - - cmp r1, #0 - bge L_neg_result - - rsbs r1, r1, #0 @ den = -den - b __aeabi_uidivmod - -L_num_pos: - cmp r1, #0 - bge __aeabi_uidivmod - - rsbs r1, r1, #0 @ den = -den - -L_neg_result: - push {lr} - bl __aeabi_uidivmod - rsbs r0, r0, #0 @ quot = -quot - pop {pc} - - - -@ {int quotient:r0, int remainder:r1} -@ __aeabi_idivmod(int numerator:r0, int denominator:r1) -@ -@ Divide r0 by r1 and return the quotient in r0 and the remainder in r1 -@ - .thumb_func - .section .text.__aeabi_idivmod - .global __aeabi_idivmod -__aeabi_idivmod: - - cmp r0, #0 - bge L_num_pos_bis - - rsbs r0, r0, #0 @ num = -num - - cmp r1, #0 - bge L_neg_both - - rsbs r1, r1, #0 @ den = -den - push {lr} - bl __aeabi_uidivmod - rsbs r1, r1, #0 @ rem = -rem - pop {pc} - -L_neg_both: - push {lr} - bl __aeabi_uidivmod - rsbs r0, r0, #0 @ quot = -quot - rsbs r1, r1, #0 @ rem = -rem - pop {pc} - -L_num_pos_bis: - cmp r1, #0 - bge __aeabi_uidivmod - - rsbs r1, r1, #0 @ den = -den - push {lr} - bl __aeabi_uidivmod - rsbs r0, r0, #0 @ quot = -quot - pop {pc} - - - -@ unsigned __aeabi_uidiv(unsigned num, unsigned denom) -@ -@ Just an alias for __aeabi_uidivmod(), the remainder is ignored -@ - .thumb_func - .section .text.__aeabi_uidivmod - .global __aeabi_uidiv -__aeabi_uidiv: - - - -@ {unsigned quotient:r0, unsigned remainder:r1} -@ __aeabi_uidivmod(unsigned numerator:r0, unsigned denominator:r1) -@ -@ Divide r0 by r1 and return the quotient in r0 and the remainder in r1 -@ - .thumb_func - .global __aeabi_uidivmod -__aeabi_uidivmod: - - - cmp r1, #0 - bne L_no_div0 - b __aeabi_idiv0 -L_no_div0: - - @ Shift left the denominator until it is greater than the numerator - movs r2, #1 @ counter - movs r3, #0 @ result - cmp r0, r1 - bls L_sub_loop0 - adds r1, #0 @ dont shift if denominator would overflow - bmi L_sub_loop0 - -L_denom_shift_loop: - lsls r2, #1 - lsls r1, #1 - bmi L_sub_loop0 - cmp r0, r1 - bhi L_denom_shift_loop - -L_sub_loop0: - cmp r0, r1 - bcc L_dont_sub0 @ if (num>denom) - - subs r0, r1 @ numerator -= denom - orrs r3, r2 @ result(r3) |= bitmask(r2) -L_dont_sub0: - - lsrs r1, #1 @ denom(r1) >>= 1 - lsrs r2, #1 @ bitmask(r2) >>= 1 - bne L_sub_loop0 - - mov r1, r0 @ remainder(r1) = numerator(r0) - mov r0, r3 @ quotient(r0) = result(r3) - bx lr - -__aeabi_idiv0: - ldr SOFTWARE_PANIC_REASON_REG, =PANIC_SW_DIV_ZERO - bl exception_panic +../../third_party/libaeabi-cortexm0/core/cortex-m0/div.S
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