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: OP_PACKED_SWITCH.S 18 * 19 * Code: Jump to a new instruction using a jump table 20 * 21 * For: packed-switch, sparse-switch 22 * 23 * Description: Jump to a new instruction based on the value in the given 24 * register, using a table of offsets corresponding to each 25 * value in a particular integral range, or fall through to 26 * the next instruction if there is no match. 27 * 28 * Format: AA|op BBBBlo BBBBhi (31t) 29 * 30 * Syntax: op vAA, +BBBBBBBB 31 */ 32 33 %default { "func":"dvmInterpHandlePackedSwitch" } 34 35 FETCH 1, %ecx # %ecx<- BBBBlo 36 FETCH 2, %edx # %edx<- BBBBhi 37 shl $$16, %edx # prepare to create +BBBBBBBB 38 or %edx, %ecx # %ecx<- +BBBBBBBB 39 GET_VREG rINST # rINST<- vAA 40 movl rINST, -4(%esp) # push parameter vAA 41 lea (rPC, %ecx, 2), %ecx # %ecx<- PC + +BBBBBBBB*2 42 movl %ecx, -8(%esp) # push parameter PC + +BBBBBBBB*2 43 lea -8(%esp), %esp 44 call $func # call code-unit branch offset 45 shl $$1, %eax # shift for byte offset 46 movl %eax, %edx # %edx<- offset 47 lea 8(%esp), %esp 48 jle common_periodicChecks_backwardBranch # do backward branch 49 jmp .L${opcode}_finish 50 %break 51 .L${opcode}_finish: 52 FINISH_RB %edx, %ecx # jump to next instruction 53
