summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorNicolas Boichat <drinkcat@chromium.org>2019-05-09 14:15:36 +0900
committerCommit Bot <commit-bot@chromium.org>2020-03-25 02:13:31 +0000
commit509f29d6ce3d684f4c21a02f49f76e08353110f1 (patch)
tree8046062a964262b2f2c6cba44c611066ac250feb
parentc830ecc1f728b722fde24a5da14a89f9223f291c (diff)
downloadchrome-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>
l---------[-rw-r--r--]core/cortex-m/ldivmod.S87
l---------[-rw-r--r--]core/cortex-m/uldivmod.S180
l---------[-rw-r--r--]core/cortex-m0/div.S167
l---------[-rw-r--r--]core/cortex-m0/ldivmod.S93
l---------[-rw-r--r--]core/cortex-m0/lmul.S66
l---------[-rw-r--r--]core/cortex-m0/uldivmod.S178
-rw-r--r--third_party/libaeabi-cortexm0/LICENSE13
-rw-r--r--third_party/libaeabi-cortexm0/METADATA17
-rw-r--r--third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S86
-rw-r--r--third_party/libaeabi-cortexm0/core/cortex-m/uldivmod.S179
-rw-r--r--third_party/libaeabi-cortexm0/core/cortex-m0/div.S166
-rw-r--r--third_party/libaeabi-cortexm0/core/cortex-m0/ldivmod.S92
-rw-r--r--third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S65
-rw-r--r--third_party/libaeabi-cortexm0/core/cortex-m0/uldivmod.S177
14 files changed, 801 insertions, 765 deletions
diff --git a/core/cortex-m/ldivmod.S b/core/cortex-m/ldivmod.S
index f3709af41a..afdeb4ec1f 100644..120000
--- a/core/cortex-m/ldivmod.S
+++ b/core/cortex-m/ldivmod.S
@@ -1,86 +1 @@
-/* Runtime ABI for the ARM Cortex-M
- * ldivmod.S: signed 64 bit division (quotient and remainder)
- *
- * 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.
- */
-
-
-
- .syntax unified
- .text
- .code 16
-
-
-@ {long long quotient, long long remainder}
-@ __aeabi_ldivmod(long long numerator, long long denominator)
-@
-@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder in
-@ r3:r2 (all signed)
-@
- .thumb_func
- .section .text.__aeabi_ldivmod
- .global __aeabi_ldivmod
-__aeabi_ldivmod:
-
- cmp r1, #0
- bge L_num_pos
-
- push {r4, lr}
- movs r4, #0 @ num = -num
- rsbs r0, r0, #0
- sbcs r4, r1
- mov r1, r4
-
- cmp r3, #0
- bge L_neg_both
-
- movs r4, #0 @ den = -den
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- bl __aeabi_uldivmod
- movs r4, #0 @ rem = -rem
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- pop {r4, pc}
-
-L_neg_both:
- bl __aeabi_uldivmod
- movs r4, #0 @ quot = -quot
- rsbs r0, r0, #0
- sbcs r4, r1
- mov r1, r4
- movs r4, #0 @ rem = -rem
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- pop {r4, pc}
-
-L_num_pos:
- cmp r3, #0
- bge __aeabi_uldivmod
-
- push {r4, lr}
- movs r4, #0 @ den = -den
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- bl __aeabi_uldivmod
- movs r4, #0 @ quot = -quot
- rsbs r0, r0, #0
- sbcs r4, r1
- mov r1, r4
- pop {r4, pc}
+../../third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S \ No newline at end of file
diff --git a/core/cortex-m/uldivmod.S b/core/cortex-m/uldivmod.S
index da60793e67..7047a8c5d4 100644..120000
--- a/core/cortex-m/uldivmod.S
+++ b/core/cortex-m/uldivmod.S
@@ -1,179 +1 @@
-/* Runtime ABI for the ARM Cortex-M
- * uldivmod.S: unsigned 64 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
- .code 16
-
-
-
-@ {unsigned long long quotient, unsigned long long remainder}
-@ __aeabi_uldivmod(unsigned long long numerator, unsigned long long denominator)
-@
-@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder
-@ in r3:r2 (all unsigned)
-@
- .thumb_func
- .section .text.__aeabi_uldivmod
- .global __aeabi_uldivmod
-__aeabi_uldivmod:
-
- cmp r3, #0
- bne L_large_denom
- cmp r2, #0
- beq L_divison_by_0
- cmp r1, #0
- beq L_fallback_32bits
-
-
-
- @ case 1: num >= 2^32 and denom < 2^32
- @ Result might be > 2^32, therefore we first calculate the upper 32
- @ bits of the result. It is done similar to the calculation of the
- @ lower 32 bits, but with a denominator that is shifted by 32.
- @ Hence the lower 32 bits of the denominator are always 0 and the
- @ costly 64 bit shift and sub operations can be replaced by cheap 32
- @ bit operations.
-
- push {r4, r5, r6, r7, lr}
-
- @ shift left the denominator until it is greater than the numerator
- @ denom(r7:r6) = r3:r2 << 32
-
- @ TODO(crosbug.com/p/36128): Loops like this (which occur in several
- @ places in this file) are inefficent in ARMv6-m.
-
- movs r5, #1 @ bitmask
- adds r7, r2, #0 @ dont shift if denominator would overflow
- bmi L_upper_result
- cmp r1, r7
- blo L_upper_result
-
-L_denom_shift_loop1:
- lsl r5, #1
- lsls r7, #1
- bmi L_upper_result @ dont shift if overflow
- cmp r1, r7
- bhs L_denom_shift_loop1
-
-L_upper_result:
- mov r3, r1
- mov r2, r0
- mov r1, #0 @ upper result = 0
- mov r6, #0
-
-L_sub_loop1:
- orr r1, r5 @ result(r7:r6) |= bitmask(r5)
- subs r2, r6 @ num -= denom
- sbcs r3, r7
- bhs L_done_sub1
-
- eor r1, r5 @ undo add mask
- adds r2, r6 @ undo subtract
- adc r3, r3, r7
-
-L_done_sub1:
- lsrs r7, #1 @ denom(r7:r6) >>= 1
- rrx r6, r6
- lsrs r5, #1 @ bitmask(r5) >>= 1
- bne L_sub_loop1
-
- rrx r5, r5
- b L_lower_result
-
-
-
- @ case 2: division by 0
- @ call __aeabi_ldiv0
-
-L_divison_by_0:
- b __aeabi_ldiv0
-
-
-
- @ case 3: num < 2^32 and denom < 2^32
- @ fallback to 32 bit division
-
-L_fallback_32bits:
- mov r1, r0
- udiv r0, r0, r2 @ r0 = quotient
- mul r3, r0, r2 @ r3 = quotient * divisor
- sub r2, r1, r3 @ r2 = remainder
- mov r1, #0
- mov r3, #0
- bx lr
-
-
-
- @ case 4: denom >= 2^32
- @ result is smaller than 2^32
-
-L_large_denom:
- push {r4, r5, r6, r7, lr}
-
- mov r7, r3
- mov r6, r2
- mov r3, r1
- mov r2, r0
-
- @ Shift left the denominator until it is greater than the numerator
-
- mov r1, #0 @ high word of result is 0
- mov r5, #1 @ bitmask
- adds r7, #0 @ dont shift if denominator would overflow
- bmi L_lower_result
- cmp r3, r7
- blo L_lower_result
-
-L_denom_shift_loop4:
- lsl r5, #1
- lsls r6, #1 @ denom(r7:r6) <<= 1
- adcs r7, r7
- bmi L_lower_result @ dont shift if overflow
- cmp r3, r7
- bhs L_denom_shift_loop4
-
-
-
-L_lower_result:
- movs r0, #0
-
-L_sub_loop4:
- orr r0, r5 @ result(r1:r0) |= bitmask(r5)
- subs r2, r6 @ numerator -= denom
- sbcs r3, r7
- bhs L_done_sub4
-
- eor r0, r5 @ undo add mask
- adds r2, r6 @ undo subtract
- adc r3, r3, r7
-
-L_done_sub4:
- lsrs r7, #1 @ denom(r7:r6) >>= 1
- rrx r6, r6
- lsrs r5, #1 @ bitmask(r5) >>= 1
- bne L_sub_loop4
-
- pop {r4, r5, r6, r7, pc}
-
-__aeabi_ldiv0:
- ldr SOFTWARE_PANIC_REASON_REG, =PANIC_SW_DIV_ZERO
- bl exception_panic
+../../third_party/libaeabi-cortexm0/core/cortex-m/uldivmod.S \ No newline at end of file
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 \ No newline at end of file
diff --git a/core/cortex-m0/ldivmod.S b/core/cortex-m0/ldivmod.S
index f552829ab2..603ea316c8 100644..120000
--- a/core/cortex-m0/ldivmod.S
+++ b/core/cortex-m0/ldivmod.S
@@ -1,92 +1 @@
-/* Runtime ABI for the ARM Cortex-M0
- * ldivmod.S: signed 64 bit division (quotient and remainder)
- *
- * Copyright 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.
- */
-
-
-
- .syntax unified
- .text
- .thumb
- .cpu cortex-m0
-
-
-
-@ {long long quotient, long long remainder}
-@ __aeabi_ldivmod(long long numerator, long long denominator)
-@
-@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder in
-@ r3:r2 (all signed)
-@
- .thumb_func
- .section .text.__aeabi_ldivmod
- .global __aeabi_ldivmod
-__aeabi_ldivmod:
-
- cmp r1, #0
- bge L_num_pos
-
- push {r4, lr}
- movs r4, #0 @ num = -num
- rsbs r0, r0, #0
- sbcs r4, r1
- mov r1, r4
-
- cmp r3, #0
- bge L_neg_both
-
- movs r4, #0 @ den = -den
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- bl __aeabi_uldivmod
- movs r4, #0 @ rem = -rem
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- pop {r4, pc}
-
-L_neg_both:
- bl __aeabi_uldivmod
- movs r4, #0 @ quot = -quot
- rsbs r0, r0, #0
- sbcs r4, r1
- mov r1, r4
- movs r4, #0 @ rem = -rem
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- pop {r4, pc}
-
-L_num_pos:
- cmp r3, #0
- blt L_den_neg
- push {r4, lr}
- bl __aeabi_uldivmod @ offset too big for b / bge
- pop {r4, pc}
-
-L_den_neg:
- push {r4, lr}
- movs r4, #0 @ den = -den
- rsbs r2, r2, #0
- sbcs r4, r3
- mov r3, r4
- bl __aeabi_uldivmod
- movs r4, #0 @ quot = -quot
- rsbs r0, r0, #0
- sbcs r4, r1
- mov r1, r4
- pop {r4, pc}
+../../third_party/libaeabi-cortexm0/core/cortex-m0/ldivmod.S \ No newline at end of file
diff --git a/core/cortex-m0/lmul.S b/core/cortex-m0/lmul.S
index ab04fd488f..ab5bfc3cb2 100644..120000
--- a/core/cortex-m0/lmul.S
+++ b/core/cortex-m0/lmul.S
@@ -1,65 +1 @@
-/* Runtime ABI for the ARM Cortex-M0
- * lmul.S: 64 bit multiplication
- *
- * Copyright (c) 2013 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.
- */
-
-
-
- .syntax unified
- .text
- .thumb
- .cpu cortex-m0
-
-
-
-@ long long __aeabi_lmul(long long r1:r0, long long r3:r2)
-@
-@ Multiply r1:r0 and r3:r2 and return the product in r1:r0
-@ Can also be used for unsigned long product
-@
- .thumb_func
- .section .text.__aeabi_lmul
- .global __aeabi_lmul
-__aeabi_lmul:
-
- push {r4, lr}
- muls r1, r2
- muls r3, r0
- adds r1, r3
-
- lsrs r3, r0, #16
- lsrs r4, r2, #16
- muls r3, r4
- adds r1, r3
-
- lsrs r3, r0, #16
- uxth r0, r0
- uxth r2, r2
- muls r3, r2
- muls r4, r0
- muls r0, r2
-
- movs r2, #0
- adds r3, r4
- adcs r2, r2
- lsls r2, #16
- adds r1, r2
-
- lsls r2, r3, #16
- lsrs r3, #16
- adds r0, r2
- adcs r1, r3
- pop {r4, pc}
+../../third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S \ No newline at end of file
diff --git a/core/cortex-m0/uldivmod.S b/core/cortex-m0/uldivmod.S
index 269645268b..6d1e5e1998 100644..120000
--- a/core/cortex-m0/uldivmod.S
+++ b/core/cortex-m0/uldivmod.S
@@ -1,177 +1 @@
-/* Runtime ABI for the ARM Cortex-M0
- * uldivmod.S: unsigned 64 bit division
- *
- * Copyright 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
-
-
-
-@ {unsigned long long quotient, unsigned long long remainder}
-@ __aeabi_uldivmod(unsigned long long numerator, unsigned long long denominator)
-@
-@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder
-@ in r3:r2 (all unsigned)
-@
- .thumb_func
- .section .text.__aeabi_uldivmod
- .global __aeabi_uldivmod
-__aeabi_uldivmod:
-
- cmp r3, #0
- bne L_large_denom
- cmp r2, #0
- beq L_divison_by_0
- cmp r1, #0
- beq L_fallback_32bits
-
-
-
- @ case 1: num >= 2^32 and denom < 2^32
- @ Result might be > 2^32, therefore we first calculate the upper 32
- @ bits of the result. It is done similar to the calculation of the
- @ lower 32 bits, but with a denominator that is shifted by 32.
- @ Hence the lower 32 bits of the denominator are always 0 and the
- @ costly 64 bit shift and sub operations can be replaced by cheap 32
- @ bit operations.
-
- push {r4, r5, r6, r7, lr}
-
- @ shift left the denominator until it is greater than the numerator
- @ denom(r7:r6) = r3:r2 << 32
-
- movs r5, #1 @ bitmask
- adds r7, r2, #0 @ dont shift if denominator would overflow
- bmi L_upper_result
- cmp r1, r7
- blo L_upper_result
-
-L_denom_shift_loop1:
- lsls r5, #1
- lsls r7, #1
- bmi L_upper_result @ dont shift if overflow
- cmp r1, r7
- bhs L_denom_shift_loop1
-
-L_upper_result:
- mov r3, r1
- mov r2, r0
- movs r1, #0 @ upper result = 0
-
-L_sub_loop1:
- cmp r3, r7
- bcc L_dont_sub1 @ if (num>denom)
-
- subs r3, r7 @ num -= denom
- orrs r1, r5 @ result(r7:r6) |= bitmask(r5)
-L_dont_sub1:
-
- lsrs r7, #1 @ denom(r7:r6) >>= 1
- lsrs r5, #1 @ bitmask(r5) >>= 1
- bne L_sub_loop1
-
- movs r5, #1
- lsls r5, #31
- movs r6, #0
- b L_lower_result
-
-
-
- @ case 2: division by 0
- @ call __aeabi_ldiv0
-
-L_divison_by_0:
- b __aeabi_ldiv0
-
-
-
- @ case 3: num < 2^32 and denom < 2^32
- @ fallback to 32 bit division
-
-L_fallback_32bits:
- mov r1, r2
- push {lr}
- bl __aeabi_uidivmod
- mov r2, r1
- movs r1, #0
- movs r3, #0
- pop {pc}
-
-
-
- @ case 4: denom >= 2^32
- @ result is smaller than 2^32
-
-L_large_denom:
- push {r4, r5, r6, r7, lr}
-
- mov r7, r3
- mov r6, r2
- mov r3, r1
- mov r2, r0
-
- @ Shift left the denominator until it is greater than the numerator
-
- movs r1, #0 @ high word of result is 0
- movs r5, #1 @ bitmask
- adds r7, #0 @ dont shift if denominator would overflow
- bmi L_lower_result
- cmp r3, r7
- blo L_lower_result
-
-L_denom_shift_loop4:
- lsls r5, #1
- lsls r7, #1
- lsls r6, #1
- adcs r7, r1 @ r1=0
- bmi L_lower_result @ dont shift if overflow
- cmp r3, r7
- bhs L_denom_shift_loop4
-
-
-
-L_lower_result:
- movs r0, #0
-
-L_sub_loop4:
- mov r4, r3
- cmp r2, r6
- sbcs r4, r7
- bcc L_dont_sub4 @ if (num>denom)
-
- subs r2, r6 @ numerator -= denom
- sbcs r3, r7
- orrs r0, r5 @ result(r1:r0) |= bitmask(r5)
-L_dont_sub4:
-
- lsls r4, r7, #31 @ denom(r7:r6) >>= 1
- lsrs r6, #1
- lsrs r7, #1
- orrs r6, r4
- lsrs r5, #1 @ bitmask(r5) >>= 1
- bne L_sub_loop4
-
- pop {r4, r5, r6, r7, pc}
-
-__aeabi_ldiv0:
- ldr SOFTWARE_PANIC_REASON_REG, =PANIC_SW_DIV_ZERO
- bl exception_panic
+../../third_party/libaeabi-cortexm0/core/cortex-m0/uldivmod.S \ No newline at end of file
diff --git a/third_party/libaeabi-cortexm0/LICENSE b/third_party/libaeabi-cortexm0/LICENSE
new file mode 100644
index 0000000000..abb14b642c
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/LICENSE
@@ -0,0 +1,13 @@
+Licensed under the ISC licence (similar to the MIT/Expat license).
+
+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.
diff --git a/third_party/libaeabi-cortexm0/METADATA b/third_party/libaeabi-cortexm0/METADATA
new file mode 100644
index 0000000000..02ac01504c
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/METADATA
@@ -0,0 +1,17 @@
+name: "libaeabi-cortexm0"
+description:
+ "ARM Run-Time ABI for the Cortex-M0 processor"
+
+third_party {
+ url {
+ type: GIT
+ value: "https://github.com/bobbl/libaeabi-cortexm0"
+ }
+ # TODO(crbug.com/884905): Refresh as needed from upstream
+ version: "<as of 2014>"
+ last_upgrade_date { year: 2014 month: 04 day: 01 }
+ license_type: NOTICE
+ local_modifications: "cortex-m0: See git log. "
+ "cortex-m: Adapted from cortex-m0 code. "
+ "Created LICENSE file."
+} \ No newline at end of file
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S b/third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S
new file mode 100644
index 0000000000..f3709af41a
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S
@@ -0,0 +1,86 @@
+/* Runtime ABI for the ARM Cortex-M
+ * ldivmod.S: signed 64 bit division (quotient and remainder)
+ *
+ * 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.
+ */
+
+
+
+ .syntax unified
+ .text
+ .code 16
+
+
+@ {long long quotient, long long remainder}
+@ __aeabi_ldivmod(long long numerator, long long denominator)
+@
+@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder in
+@ r3:r2 (all signed)
+@
+ .thumb_func
+ .section .text.__aeabi_ldivmod
+ .global __aeabi_ldivmod
+__aeabi_ldivmod:
+
+ cmp r1, #0
+ bge L_num_pos
+
+ push {r4, lr}
+ movs r4, #0 @ num = -num
+ rsbs r0, r0, #0
+ sbcs r4, r1
+ mov r1, r4
+
+ cmp r3, #0
+ bge L_neg_both
+
+ movs r4, #0 @ den = -den
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ bl __aeabi_uldivmod
+ movs r4, #0 @ rem = -rem
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ pop {r4, pc}
+
+L_neg_both:
+ bl __aeabi_uldivmod
+ movs r4, #0 @ quot = -quot
+ rsbs r0, r0, #0
+ sbcs r4, r1
+ mov r1, r4
+ movs r4, #0 @ rem = -rem
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ pop {r4, pc}
+
+L_num_pos:
+ cmp r3, #0
+ bge __aeabi_uldivmod
+
+ push {r4, lr}
+ movs r4, #0 @ den = -den
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ bl __aeabi_uldivmod
+ movs r4, #0 @ quot = -quot
+ rsbs r0, r0, #0
+ sbcs r4, r1
+ mov r1, r4
+ pop {r4, pc}
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m/uldivmod.S b/third_party/libaeabi-cortexm0/core/cortex-m/uldivmod.S
new file mode 100644
index 0000000000..da60793e67
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/core/cortex-m/uldivmod.S
@@ -0,0 +1,179 @@
+/* Runtime ABI for the ARM Cortex-M
+ * uldivmod.S: unsigned 64 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
+ .code 16
+
+
+
+@ {unsigned long long quotient, unsigned long long remainder}
+@ __aeabi_uldivmod(unsigned long long numerator, unsigned long long denominator)
+@
+@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder
+@ in r3:r2 (all unsigned)
+@
+ .thumb_func
+ .section .text.__aeabi_uldivmod
+ .global __aeabi_uldivmod
+__aeabi_uldivmod:
+
+ cmp r3, #0
+ bne L_large_denom
+ cmp r2, #0
+ beq L_divison_by_0
+ cmp r1, #0
+ beq L_fallback_32bits
+
+
+
+ @ case 1: num >= 2^32 and denom < 2^32
+ @ Result might be > 2^32, therefore we first calculate the upper 32
+ @ bits of the result. It is done similar to the calculation of the
+ @ lower 32 bits, but with a denominator that is shifted by 32.
+ @ Hence the lower 32 bits of the denominator are always 0 and the
+ @ costly 64 bit shift and sub operations can be replaced by cheap 32
+ @ bit operations.
+
+ push {r4, r5, r6, r7, lr}
+
+ @ shift left the denominator until it is greater than the numerator
+ @ denom(r7:r6) = r3:r2 << 32
+
+ @ TODO(crosbug.com/p/36128): Loops like this (which occur in several
+ @ places in this file) are inefficent in ARMv6-m.
+
+ movs r5, #1 @ bitmask
+ adds r7, r2, #0 @ dont shift if denominator would overflow
+ bmi L_upper_result
+ cmp r1, r7
+ blo L_upper_result
+
+L_denom_shift_loop1:
+ lsl r5, #1
+ lsls r7, #1
+ bmi L_upper_result @ dont shift if overflow
+ cmp r1, r7
+ bhs L_denom_shift_loop1
+
+L_upper_result:
+ mov r3, r1
+ mov r2, r0
+ mov r1, #0 @ upper result = 0
+ mov r6, #0
+
+L_sub_loop1:
+ orr r1, r5 @ result(r7:r6) |= bitmask(r5)
+ subs r2, r6 @ num -= denom
+ sbcs r3, r7
+ bhs L_done_sub1
+
+ eor r1, r5 @ undo add mask
+ adds r2, r6 @ undo subtract
+ adc r3, r3, r7
+
+L_done_sub1:
+ lsrs r7, #1 @ denom(r7:r6) >>= 1
+ rrx r6, r6
+ lsrs r5, #1 @ bitmask(r5) >>= 1
+ bne L_sub_loop1
+
+ rrx r5, r5
+ b L_lower_result
+
+
+
+ @ case 2: division by 0
+ @ call __aeabi_ldiv0
+
+L_divison_by_0:
+ b __aeabi_ldiv0
+
+
+
+ @ case 3: num < 2^32 and denom < 2^32
+ @ fallback to 32 bit division
+
+L_fallback_32bits:
+ mov r1, r0
+ udiv r0, r0, r2 @ r0 = quotient
+ mul r3, r0, r2 @ r3 = quotient * divisor
+ sub r2, r1, r3 @ r2 = remainder
+ mov r1, #0
+ mov r3, #0
+ bx lr
+
+
+
+ @ case 4: denom >= 2^32
+ @ result is smaller than 2^32
+
+L_large_denom:
+ push {r4, r5, r6, r7, lr}
+
+ mov r7, r3
+ mov r6, r2
+ mov r3, r1
+ mov r2, r0
+
+ @ Shift left the denominator until it is greater than the numerator
+
+ mov r1, #0 @ high word of result is 0
+ mov r5, #1 @ bitmask
+ adds r7, #0 @ dont shift if denominator would overflow
+ bmi L_lower_result
+ cmp r3, r7
+ blo L_lower_result
+
+L_denom_shift_loop4:
+ lsl r5, #1
+ lsls r6, #1 @ denom(r7:r6) <<= 1
+ adcs r7, r7
+ bmi L_lower_result @ dont shift if overflow
+ cmp r3, r7
+ bhs L_denom_shift_loop4
+
+
+
+L_lower_result:
+ movs r0, #0
+
+L_sub_loop4:
+ orr r0, r5 @ result(r1:r0) |= bitmask(r5)
+ subs r2, r6 @ numerator -= denom
+ sbcs r3, r7
+ bhs L_done_sub4
+
+ eor r0, r5 @ undo add mask
+ adds r2, r6 @ undo subtract
+ adc r3, r3, r7
+
+L_done_sub4:
+ lsrs r7, #1 @ denom(r7:r6) >>= 1
+ rrx r6, r6
+ lsrs r5, #1 @ bitmask(r5) >>= 1
+ bne L_sub_loop4
+
+ pop {r4, r5, r6, r7, pc}
+
+__aeabi_ldiv0:
+ ldr SOFTWARE_PANIC_REASON_REG, =PANIC_SW_DIV_ZERO
+ bl exception_panic
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m0/div.S b/third_party/libaeabi-cortexm0/core/cortex-m0/div.S
new file mode 100644
index 0000000000..898ecafe83
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/core/cortex-m0/div.S
@@ -0,0 +1,166 @@
+/* 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
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m0/ldivmod.S b/third_party/libaeabi-cortexm0/core/cortex-m0/ldivmod.S
new file mode 100644
index 0000000000..f552829ab2
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/core/cortex-m0/ldivmod.S
@@ -0,0 +1,92 @@
+/* Runtime ABI for the ARM Cortex-M0
+ * ldivmod.S: signed 64 bit division (quotient and remainder)
+ *
+ * Copyright 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.
+ */
+
+
+
+ .syntax unified
+ .text
+ .thumb
+ .cpu cortex-m0
+
+
+
+@ {long long quotient, long long remainder}
+@ __aeabi_ldivmod(long long numerator, long long denominator)
+@
+@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder in
+@ r3:r2 (all signed)
+@
+ .thumb_func
+ .section .text.__aeabi_ldivmod
+ .global __aeabi_ldivmod
+__aeabi_ldivmod:
+
+ cmp r1, #0
+ bge L_num_pos
+
+ push {r4, lr}
+ movs r4, #0 @ num = -num
+ rsbs r0, r0, #0
+ sbcs r4, r1
+ mov r1, r4
+
+ cmp r3, #0
+ bge L_neg_both
+
+ movs r4, #0 @ den = -den
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ bl __aeabi_uldivmod
+ movs r4, #0 @ rem = -rem
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ pop {r4, pc}
+
+L_neg_both:
+ bl __aeabi_uldivmod
+ movs r4, #0 @ quot = -quot
+ rsbs r0, r0, #0
+ sbcs r4, r1
+ mov r1, r4
+ movs r4, #0 @ rem = -rem
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ pop {r4, pc}
+
+L_num_pos:
+ cmp r3, #0
+ blt L_den_neg
+ push {r4, lr}
+ bl __aeabi_uldivmod @ offset too big for b / bge
+ pop {r4, pc}
+
+L_den_neg:
+ push {r4, lr}
+ movs r4, #0 @ den = -den
+ rsbs r2, r2, #0
+ sbcs r4, r3
+ mov r3, r4
+ bl __aeabi_uldivmod
+ movs r4, #0 @ quot = -quot
+ rsbs r0, r0, #0
+ sbcs r4, r1
+ mov r1, r4
+ pop {r4, pc}
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S b/third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S
new file mode 100644
index 0000000000..ab04fd488f
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S
@@ -0,0 +1,65 @@
+/* Runtime ABI for the ARM Cortex-M0
+ * lmul.S: 64 bit multiplication
+ *
+ * Copyright (c) 2013 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.
+ */
+
+
+
+ .syntax unified
+ .text
+ .thumb
+ .cpu cortex-m0
+
+
+
+@ long long __aeabi_lmul(long long r1:r0, long long r3:r2)
+@
+@ Multiply r1:r0 and r3:r2 and return the product in r1:r0
+@ Can also be used for unsigned long product
+@
+ .thumb_func
+ .section .text.__aeabi_lmul
+ .global __aeabi_lmul
+__aeabi_lmul:
+
+ push {r4, lr}
+ muls r1, r2
+ muls r3, r0
+ adds r1, r3
+
+ lsrs r3, r0, #16
+ lsrs r4, r2, #16
+ muls r3, r4
+ adds r1, r3
+
+ lsrs r3, r0, #16
+ uxth r0, r0
+ uxth r2, r2
+ muls r3, r2
+ muls r4, r0
+ muls r0, r2
+
+ movs r2, #0
+ adds r3, r4
+ adcs r2, r2
+ lsls r2, #16
+ adds r1, r2
+
+ lsls r2, r3, #16
+ lsrs r3, #16
+ adds r0, r2
+ adcs r1, r3
+ pop {r4, pc}
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m0/uldivmod.S b/third_party/libaeabi-cortexm0/core/cortex-m0/uldivmod.S
new file mode 100644
index 0000000000..269645268b
--- /dev/null
+++ b/third_party/libaeabi-cortexm0/core/cortex-m0/uldivmod.S
@@ -0,0 +1,177 @@
+/* Runtime ABI for the ARM Cortex-M0
+ * uldivmod.S: unsigned 64 bit division
+ *
+ * Copyright 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
+
+
+
+@ {unsigned long long quotient, unsigned long long remainder}
+@ __aeabi_uldivmod(unsigned long long numerator, unsigned long long denominator)
+@
+@ Divide r1:r0 by r3:r2 and return the quotient in r1:r0 and the remainder
+@ in r3:r2 (all unsigned)
+@
+ .thumb_func
+ .section .text.__aeabi_uldivmod
+ .global __aeabi_uldivmod
+__aeabi_uldivmod:
+
+ cmp r3, #0
+ bne L_large_denom
+ cmp r2, #0
+ beq L_divison_by_0
+ cmp r1, #0
+ beq L_fallback_32bits
+
+
+
+ @ case 1: num >= 2^32 and denom < 2^32
+ @ Result might be > 2^32, therefore we first calculate the upper 32
+ @ bits of the result. It is done similar to the calculation of the
+ @ lower 32 bits, but with a denominator that is shifted by 32.
+ @ Hence the lower 32 bits of the denominator are always 0 and the
+ @ costly 64 bit shift and sub operations can be replaced by cheap 32
+ @ bit operations.
+
+ push {r4, r5, r6, r7, lr}
+
+ @ shift left the denominator until it is greater than the numerator
+ @ denom(r7:r6) = r3:r2 << 32
+
+ movs r5, #1 @ bitmask
+ adds r7, r2, #0 @ dont shift if denominator would overflow
+ bmi L_upper_result
+ cmp r1, r7
+ blo L_upper_result
+
+L_denom_shift_loop1:
+ lsls r5, #1
+ lsls r7, #1
+ bmi L_upper_result @ dont shift if overflow
+ cmp r1, r7
+ bhs L_denom_shift_loop1
+
+L_upper_result:
+ mov r3, r1
+ mov r2, r0
+ movs r1, #0 @ upper result = 0
+
+L_sub_loop1:
+ cmp r3, r7
+ bcc L_dont_sub1 @ if (num>denom)
+
+ subs r3, r7 @ num -= denom
+ orrs r1, r5 @ result(r7:r6) |= bitmask(r5)
+L_dont_sub1:
+
+ lsrs r7, #1 @ denom(r7:r6) >>= 1
+ lsrs r5, #1 @ bitmask(r5) >>= 1
+ bne L_sub_loop1
+
+ movs r5, #1
+ lsls r5, #31
+ movs r6, #0
+ b L_lower_result
+
+
+
+ @ case 2: division by 0
+ @ call __aeabi_ldiv0
+
+L_divison_by_0:
+ b __aeabi_ldiv0
+
+
+
+ @ case 3: num < 2^32 and denom < 2^32
+ @ fallback to 32 bit division
+
+L_fallback_32bits:
+ mov r1, r2
+ push {lr}
+ bl __aeabi_uidivmod
+ mov r2, r1
+ movs r1, #0
+ movs r3, #0
+ pop {pc}
+
+
+
+ @ case 4: denom >= 2^32
+ @ result is smaller than 2^32
+
+L_large_denom:
+ push {r4, r5, r6, r7, lr}
+
+ mov r7, r3
+ mov r6, r2
+ mov r3, r1
+ mov r2, r0
+
+ @ Shift left the denominator until it is greater than the numerator
+
+ movs r1, #0 @ high word of result is 0
+ movs r5, #1 @ bitmask
+ adds r7, #0 @ dont shift if denominator would overflow
+ bmi L_lower_result
+ cmp r3, r7
+ blo L_lower_result
+
+L_denom_shift_loop4:
+ lsls r5, #1
+ lsls r7, #1
+ lsls r6, #1
+ adcs r7, r1 @ r1=0
+ bmi L_lower_result @ dont shift if overflow
+ cmp r3, r7
+ bhs L_denom_shift_loop4
+
+
+
+L_lower_result:
+ movs r0, #0
+
+L_sub_loop4:
+ mov r4, r3
+ cmp r2, r6
+ sbcs r4, r7
+ bcc L_dont_sub4 @ if (num>denom)
+
+ subs r2, r6 @ numerator -= denom
+ sbcs r3, r7
+ orrs r0, r5 @ result(r1:r0) |= bitmask(r5)
+L_dont_sub4:
+
+ lsls r4, r7, #31 @ denom(r7:r6) >>= 1
+ lsrs r6, #1
+ lsrs r7, #1
+ orrs r6, r4
+ lsrs r5, #1 @ bitmask(r5) >>= 1
+ bne L_sub_loop4
+
+ pop {r4, r5, r6, r7, pc}
+
+__aeabi_ldiv0:
+ ldr SOFTWARE_PANIC_REASON_REG, =PANIC_SW_DIV_ZERO
+ bl exception_panic