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46e392e01c
params. a number of fixes to assembly routines that assumed R0 had the first arg. one stack offset fix, arm pushes the link register on stack top. go/test: passes 65% (235/364) tests R=rsc APPROVED=rsc DELTA=20 (11 added, 0 deleted, 9 changed) OCL=34809 CL=34812
168 lines
3.7 KiB
ArmAsm
168 lines
3.7 KiB
ArmAsm
// Inferno's libkern/vlop-arm.s
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// http://code.google.com/p/inferno-os/source/browse/libkern/vlop-arm.s
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
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// Portions Copyright 2009 The Go Authors. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#define UMULL(Rs,Rm,Rhi,Rlo,S) WORD $((14<<28)|(4<<21)|(S<<20)|(Rhi<<16)|(Rlo<<12)|(Rs<<8)|(9<<4)|Rm)
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#define UMLAL(Rs,Rm,Rhi,Rlo,S) WORD $((14<<28)|(5<<21)|(S<<20)|(Rhi<<16)|(Rlo<<12)|(Rs<<8)|(9<<4)|Rm)
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#define MUL(Rs,Rm,Rd,S) WORD $((14<<28)|(0<<21)|(S<<20)|(Rd<<16)|(Rs<<8)|(9<<4)|Rm)
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arg=0
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/* replaced use of R10 by R11 because the former can be the data segment base register */
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TEXT _mulv(SB), $0
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MOVW 0(FP), R0
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MOVW 8(FP), R2 /* l0 */
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MOVW 4(FP), R3 /* h0 */
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MOVW 16(FP), R4 /* l1 */
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MOVW 12(FP), R5 /* h1 */
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UMULL(4, 2, 7, 6, 0)
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MUL(3, 4, 8, 0)
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ADD R8, R7
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MUL(2, 5, 8, 0)
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ADD R8, R7
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MOVW R6, 4(R(arg))
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MOVW R7, 0(R(arg))
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RET
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Q = 0
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N = 1
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D = 2
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CC = 3
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TMP = 11
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TEXT save<>(SB), 7, $0
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MOVW R(Q), 0(FP)
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MOVW R(N), 4(FP)
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MOVW R(D), 8(FP)
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MOVW R(CC), 12(FP)
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MOVW R(TMP), R(Q) /* numerator */
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MOVW 20(FP), R(D) /* denominator */
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CMP $0, R(D)
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BNE s1
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SWI 0
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/* MOVW -1(R(D)), R(TMP) /* divide by zero fault */
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s1: RET
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TEXT rest<>(SB), 7, $0
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MOVW 0(FP), R(Q)
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MOVW 4(FP), R(N)
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MOVW 8(FP), R(D)
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MOVW 12(FP), R(CC)
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/*
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* return to caller
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* of rest<>
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*/
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MOVW 0(R13), R14
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ADD $20, R13
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B (R14)
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TEXT div<>(SB), 7, $0
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MOVW $32, R(CC)
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/*
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* skip zeros 8-at-a-time
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*/
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e1:
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AND.S $(0xff<<24),R(Q), R(N)
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BNE e2
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SLL $8, R(Q)
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SUB.S $8, R(CC)
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BNE e1
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RET
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e2:
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MOVW $0, R(N)
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loop:
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/*
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* shift R(N||Q) left one
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*/
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SLL $1, R(N)
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CMP $0, R(Q)
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ORR.LT $1, R(N)
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SLL $1, R(Q)
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/*
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* compare numerator to denominator
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* if less, subtract and set quotent bit
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*/
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CMP R(D), R(N)
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ORR.HS $1, R(Q)
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SUB.HS R(D), R(N)
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SUB.S $1, R(CC)
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BNE loop
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RET
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TEXT _div(SB), 7, $16
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BL save<>(SB)
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CMP $0, R(Q)
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BGE d1
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RSB $0, R(Q), R(Q)
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CMP $0, R(D)
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BGE d2
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RSB $0, R(D), R(D)
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d0:
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BL div<>(SB) /* none/both neg */
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MOVW R(Q), R(TMP)
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B out
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d1:
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CMP $0, R(D)
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BGE d0
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RSB $0, R(D), R(D)
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d2:
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BL div<>(SB) /* one neg */
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RSB $0, R(Q), R(TMP)
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B out
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TEXT _mod(SB), 7, $16
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BL save<>(SB)
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CMP $0, R(D)
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RSB.LT $0, R(D), R(D)
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CMP $0, R(Q)
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BGE m1
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RSB $0, R(Q), R(Q)
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BL div<>(SB) /* neg numerator */
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RSB $0, R(N), R(TMP)
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B out
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m1:
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BL div<>(SB) /* pos numerator */
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MOVW R(N), R(TMP)
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B out
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TEXT _divu(SB), 7, $16
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BL save<>(SB)
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BL div<>(SB)
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MOVW R(Q), R(TMP)
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B out
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TEXT _modu(SB), 7, $16
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BL save<>(SB)
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BL div<>(SB)
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MOVW R(N), R(TMP)
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B out
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out:
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BL rest<>(SB)
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B out
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