/* Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /* * File: zcmp.S * * Code: Generic 32-bit comparison operation. Provides a "revcmp" * variable to specify the reverse comparison to perform * * For: if-eqz, if-gez, if-gtz, if-lez, if-ltz, if-nez * * Description: Branch to the given destination if the given register's * value compares with 0 as specified. * * Format: AA|op BBBB (21t) * * Syntax: op vAA, +BBBB */ cmp $$0, (rFP, rINST, 4) # compare vAA with zero j${revcmp} ${opcode}_2f # goto next instruction or branch FETCHs 1, %edx # %edx<- BBBB; branch offset sal $$1, %edx # %edx<- adjust byte offset /* * Inline common_backwardBranch */ js common_periodicChecks2 # jump on backwards branch 1: FINISH_RB %edx, %ecx # jump to next instruction /* * FINISH code */ ${opcode}_2f: movzbl 4(rPC), %edx # grab the next opcode movzbl 5(rPC), rINST # update the instruction addl $$4, rPC # update the program counter jmp *dvmAsmInstructionJmpTable(, %edx, 4) # jump to next instruction