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_periodicChecks2  # do backward branch
49    jmp         .L${opcode}_finish
50%break
51.L${opcode}_finish:
52    FINISH_RB   %edx, %ecx              # jump to next instruction
53
54