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: zcmp.S 18 * 19 * Code: Generic 32-bit comparison operation. Provides a "revcmp" 20 * variable to specify the reverse comparison to perform 21 * 22 * For: if-eqz, if-gez, if-gtz, if-lez, if-ltz, if-nez 23 * 24 * Description: Branch to the given destination if the given register's 25 * value compares with 0 as specified. 26 * 27 * Format: AA|op BBBB (21t) 28 * 29 * Syntax: op vAA, +BBBB 30 */ 31 32 cmp $$0, (rFP, rINST, 4) # compare vAA with zero 33 j${revcmp} ${opcode}_2f # goto next instruction or branch 34 FETCHs 1, %edx # %edx<- BBBB; branch offset 35 sal $$1, %edx # %edx<- adjust byte offset 36 37 /* 38 * Inline common_backwardBranch 39 */ 40 41 js common_periodicChecks_backwardBranch # jump on backwards branch 421: 43 FINISH_RB %edx, %ecx # jump to next instruction 44 45 /* 46 * FINISH code 47 */ 48 49${opcode}_2f: 50 movzbl 4(rPC), %edx # grab the next opcode 51 movzbl 5(rPC), rINST # update the instruction 52 addl $$4, rPC # update the program counter 53 jmp *dvmAsmInstructionJmpTable(, %edx, 4) # jump to next instruction 54