diff options
Diffstat (limited to 'MdePkg/Library/CompilerIntrinsicsLib/Arm/div.asm')
| -rw-r--r-- | MdePkg/Library/CompilerIntrinsicsLib/Arm/div.asm | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/MdePkg/Library/CompilerIntrinsicsLib/Arm/div.asm b/MdePkg/Library/CompilerIntrinsicsLib/Arm/div.asm new file mode 100644 index 0000000000..3cbeaa4c1b --- /dev/null +++ b/MdePkg/Library/CompilerIntrinsicsLib/Arm/div.asm @@ -0,0 +1,180 @@ +//------------------------------------------------------------------------------
+//
+// Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+// Copyright (c) 2018, Pete Batard. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+
+ EXPORT __aeabi_uidiv
+ EXPORT __aeabi_uidivmod
+ EXPORT __aeabi_idiv
+ EXPORT __aeabi_idivmod
+ EXPORT __rt_udiv
+ EXPORT __rt_sdiv
+
+ AREA Math, CODE, READONLY
+
+;
+;UINT32
+;EFIAPI
+;__aeabi_uidivmod (
+; IN UINT32 Dividend
+; IN UINT32 Divisor
+; );
+;
+__aeabi_uidiv
+__aeabi_uidivmod
+ RSBS r12, r1, r0, LSR #4
+ MOV r2, #0
+ BCC __arm_div4
+ RSBS r12, r1, r0, LSR #8
+ BCC __arm_div8
+ MOV r3, #0
+ B __arm_div_large
+
+;
+;UINT64
+;EFIAPI
+;__rt_udiv (
+; IN UINT32 Divisor,
+; IN UINT32 Dividend
+; );
+;
+__rt_udiv
+ ; Swap R0 and R1
+ MOV r12, r0
+ MOV r0, r1
+ MOV r1, r12
+ B __aeabi_uidivmod
+
+;
+;UINT64
+;EFIAPI
+;__rt_sdiv (
+; IN INT32 Divisor,
+; IN INT32 Dividend
+; );
+;
+__rt_sdiv
+ ; Swap R0 and R1
+ MOV r12, r0
+ MOV r0, r1
+ MOV r1, r12
+ B __aeabi_idivmod
+
+;
+;INT32
+;EFIAPI
+;__aeabi_idivmod (
+; IN INT32 Dividend
+; IN INT32 Divisor
+; );
+;
+__aeabi_idiv
+__aeabi_idivmod
+ ORRS r12, r0, r1
+ BMI __arm_div_negative
+ RSBS r12, r1, r0, LSR #1
+ MOV r2, #0
+ BCC __arm_div1
+ RSBS r12, r1, r0, LSR #4
+ BCC __arm_div4
+ RSBS r12, r1, r0, LSR #8
+ BCC __arm_div8
+ MOV r3, #0
+ B __arm_div_large
+__arm_div8
+ RSBS r12, r1, r0, LSR #7
+ SUBCS r0, r0, r1, LSL #7
+ ADC r2, r2, r2
+ RSBS r12, r1, r0,LSR #6
+ SUBCS r0, r0, r1, LSL #6
+ ADC r2, r2, r2
+ RSBS r12, r1, r0, LSR #5
+ SUBCS r0, r0, r1, LSL #5
+ ADC r2, r2, r2
+ RSBS r12, r1, r0, LSR #4
+ SUBCS r0, r0, r1, LSL #4
+ ADC r2, r2, r2
+__arm_div4
+ RSBS r12, r1, r0, LSR #3
+ SUBCS r0, r0, r1, LSL #3
+ ADC r2, r2, r2
+ RSBS r12, r1, r0, LSR #2
+ SUBCS r0, r0, r1, LSL #2
+ ADCS r2, r2, r2
+ RSBS r12, r1, r0, LSR #1
+ SUBCS r0, r0, r1, LSL #1
+ ADC r2, r2, r2
+__arm_div1
+ SUBS r1, r0, r1
+ MOVCC r1, r0
+ ADC r0, r2, r2
+ BX r14
+__arm_div_negative
+ ANDS r2, r1, #0x80000000
+ RSBMI r1, r1, #0
+ EORS r3, r2, r0, ASR #32
+ RSBCS r0, r0, #0
+ RSBS r12, r1, r0, LSR #4
+ BCC label1
+ RSBS r12, r1, r0, LSR #8
+ BCC label2
+__arm_div_large
+ LSL r1, r1, #6
+ RSBS r12, r1, r0, LSR #8
+ ORR r2, r2, #0xfc000000
+ BCC label2
+ LSL r1, r1, #6
+ RSBS r12, r1, r0, LSR #8
+ ORR r2, r2, #0x3f00000
+ BCC label2
+ LSL r1, r1, #6
+ RSBS r12, r1, r0, LSR #8
+ ORR r2, r2, #0xfc000
+ ORRCS r2, r2, #0x3f00
+ LSLCS r1, r1, #6
+ RSBS r12, r1, #0
+ BCS __aeabi_idiv0
+label3
+ LSRCS r1, r1, #6
+label2
+ RSBS r12, r1, r0, LSR #7
+ SUBCS r0, r0, r1, LSL #7
+ ADC r2, r2, r2
+ RSBS r12, r1, r0, LSR #6
+ SUBCS r0, r0, r1, LSL #6
+ ADC r2, r2, r2
+ RSBS r12, r1, r0, LSR #5
+ SUBCS r0, r0, r1, LSL #5
+ ADC r2, r2, r2
+ RSBS r12, r1, r0, LSR #4
+ SUBCS r0, r0, r1, LSL #4
+ ADC r2, r2, r2
+label1
+ RSBS r12, r1, r0, LSR #3
+ SUBCS r0, r0, r1, LSL #3
+ ADC r2, r2, r2
+ RSBS r12, r1, r0, LSR #2
+ SUBCS r0, r0, r1, LSL #2
+ ADCS r2, r2, r2
+ BCS label3
+ RSBS r12, r1, r0, LSR #1
+ SUBCS r0, r0, r1, LSL #1
+ ADC r2, r2, r2
+ SUBS r1, r0, r1
+ MOVCC r1, r0
+ ADC r0, r2, r2
+ ASRS r3, r3, #31
+ RSBMI r0, r0, #0
+ RSBCS r1, r1, #0
+ BX r14
+
+ ; What to do about division by zero? For now, just return.
+__aeabi_idiv0
+ BX r14
+
+ END
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