mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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55aee3888a
Import code to do 64-bit multiplication on Cortex-M0 core without SMULL instruction. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=none TEST=make buildall add a 64-bit multiplication and see it compiled properly. verify in .map files that the code is discarded for cortex-M0 based platforms not using the 64-bit multiplication. Change-Id: I0a91b3502f4bee4bb79b193fe0854e56a7d498f7 Reviewed-on: https://chromium-review.googlesource.com/207132 Reviewed-by: Randall Spangler <rspangler@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
75 lines
1.6 KiB
ArmAsm
75 lines
1.6 KiB
ArmAsm
/* Runtime ABI for the ARM Cortex-M0
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* lmul.S: 64 bit multiplication
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*
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* Copyright (c) 2013 Jörg Mische <bobbl@gmx.de>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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.syntax unified
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.text
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.thumb
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.cpu cortex-m0
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@ long long __muldi3(long long, long long)
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@
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@ libgcc wrapper: just an alias for __aeabi_lmul()
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@
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.thumb_func
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.global __muldi3
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__muldi3:
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@ long long __aeabi_lmul(long long r1:r0, long long r3:r2)
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@
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@ Multiply r1:r0 and r3:r2 and return the product in r1:r0
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@ Can also be used for unsigned long product
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@
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.thumb_func
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.global __aeabi_lmul
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__aeabi_lmul:
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push {r4, lr}
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muls r1, r2
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muls r3, r0
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adds r1, r3
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lsrs r3, r0, #16
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lsrs r4, r2, #16
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muls r3, r4
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adds r1, r3
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lsrs r3, r0, #16
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uxth r0, r0
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uxth r2, r2
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muls r3, r2
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muls r4, r0
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muls r0, r2
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movs r2, #0
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adds r3, r4
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adcs r2, r2
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lsls r2, #16
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adds r1, r2
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lsls r2, r3, #16
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lsrs r3, #16
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adds r0, r2
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adcs r1, r3
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pop {r4, pc}
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