1 /* Copyright (C) 2008 The Android Open Source Project 2 * 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 /* 17 * File: binopDLit16.S 18 * 19 * Code: 32-bit "lit16" divide operation. If "div" is set, the code 20 * returns the quotient, else it returns the remainder. 21 * Also, a divide-by-zero check is done. 22 * 23 * For: div-int/lit16, rem-int/lit16 24 * 25 * Description: Perform a binary operation on a register and a 26 * sign extended 16-bit literal value 27 * 28 * Format: B|A|op CCCC (22s) 29 * 30 * Syntax: op vA, vB, #+CCCC 31 */ 32 33 %default {"div":"1"} 34 35 movl rINST, %eax # %eax<- BA 36 shr $$4, %eax # %eax<- B 37 FETCHs 1, %ecx # %ecx<- +CCCC, sign-extended literal 38 cmp $$0, %ecx # check for divide by zero 39 GET_VREG %eax # %eax<- vB 40 je common_errDivideByZero # handle divide by zero 41 andl $$15, rINST # rINST<- A 42 cmpl $$-1, %ecx # handle -1 special case divide error 43 jne .L${opcode}_noerror 44 cmpl $$0x80000000,%eax # handle min int special case divide error 45 je .L${opcode}_break 46 .L${opcode}_noerror: 47 cdq # sign-extend %eax to %edx 48 idiv %ecx # divide %edx:%eax by %ecx 49 #FFETCH_ADV 2, %ecx # %ecx<- next instruction hi; fetch, advance 50 .if $div 51 SET_VREG %eax rINST # vA<- %eax (quotient) 52 .else 53 SET_VREG %edx rINST # vA<- %edx (remainder) 54 .endif 55 jmp .L${opcode}_break2 56 57 %break 58 .L${opcode}_break: 59 .if $div 60 movl $$0x80000000, (rFP, rINST, 4) # vAA<- min int 61 .else 62 movl $$0, (rFP, rINST, 4) # vAA<- 0 63 .endif 64 .L${opcode}_break2: 65 66 FINISH 2 # jump to next instruction 67
