diff options
Diffstat (limited to 'third_party/libaeabi-cortexm0/core')
-rw-r--r-- | third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S | 86 | ||||
-rw-r--r-- | third_party/libaeabi-cortexm0/core/cortex-m/uldivmod.S | 180 | ||||
-rw-r--r-- | third_party/libaeabi-cortexm0/core/cortex-m0/div.S | 167 | ||||
-rw-r--r-- | third_party/libaeabi-cortexm0/core/cortex-m0/ldivmod.S | 92 | ||||
-rw-r--r-- | third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S | 65 | ||||
-rw-r--r-- | third_party/libaeabi-cortexm0/core/cortex-m0/uldivmod.S | 178 |
6 files changed, 0 insertions, 768 deletions
diff --git a/third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S b/third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S deleted file mode 100644 index f3709af41a..0000000000 --- a/third_party/libaeabi-cortexm0/core/cortex-m/ldivmod.S +++ /dev/null @@ -1,86 +0,0 @@ -/* 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 deleted file mode 100644 index 63f060891b..0000000000 --- a/third_party/libaeabi-cortexm0/core/cortex-m/uldivmod.S +++ /dev/null @@ -1,180 +0,0 @@ -/* 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 - mov SOFTWARE_PANIC_INFO_REG, r14 - 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 deleted file mode 100644 index 06dc7afacb..0000000000 --- a/third_party/libaeabi-cortexm0/core/cortex-m0/div.S +++ /dev/null @@ -1,167 +0,0 @@ -/* 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 - mov SOFTWARE_PANIC_INFO_REG, r14 - 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 deleted file mode 100644 index f552829ab2..0000000000 --- a/third_party/libaeabi-cortexm0/core/cortex-m0/ldivmod.S +++ /dev/null @@ -1,92 +0,0 @@ -/* 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 deleted file mode 100644 index ab04fd488f..0000000000 --- a/third_party/libaeabi-cortexm0/core/cortex-m0/lmul.S +++ /dev/null @@ -1,65 +0,0 @@ -/* 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 deleted file mode 100644 index 6c0a469d65..0000000000 --- a/third_party/libaeabi-cortexm0/core/cortex-m0/uldivmod.S +++ /dev/null @@ -1,178 +0,0 @@ -/* 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 - mov SOFTWARE_PANIC_INFO_REG, r14 - bl exception_panic |