1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17    .text
18
19/*
20 * Interpreter entry point.
21 * On entry:
22 *  x0  Thread* self/
23 *  x1  code_item
24 *  x2  ShadowFrame
25 *  x3  JValue* result_register
26 *
27 */
28    .global ExecuteMterpImpl
29    .type   ExecuteMterpImpl, %function
30    .balign 16
31
32ExecuteMterpImpl:
33    .cfi_startproc
34    stp     xPROFILE, x27, [sp, #-80]!
35    stp     xIBASE, xREFS, [sp, #16]
36    stp     xSELF, xINST, [sp, #32]
37    stp     xPC, xFP, [sp, #48]
38    stp     fp, lr, [sp, #64]
39    add     fp, sp, #64
40
41    /* Remember the return register */
42    str     x3, [x2, #SHADOWFRAME_RESULT_REGISTER_OFFSET]
43
44    /* Remember the code_item */
45    str     x1, [x2, #SHADOWFRAME_CODE_ITEM_OFFSET]
46
47    /* set up "named" registers */
48    mov     xSELF, x0
49    ldr     w0, [x2, #SHADOWFRAME_NUMBER_OF_VREGS_OFFSET]
50    add     xFP, x2, #SHADOWFRAME_VREGS_OFFSET     // point to vregs.
51    add     xREFS, xFP, w0, lsl #2                 // point to reference array in shadow frame
52    ldr     w0, [x2, #SHADOWFRAME_DEX_PC_OFFSET]   // Get starting dex_pc.
53    add     xPC, x1, #CODEITEM_INSNS_OFFSET        // Point to base of insns[]
54    add     xPC, xPC, w0, lsl #1                   // Create direct pointer to 1st dex opcode
55    EXPORT_PC
56
57    /* Starting ibase */
58    ldr     xIBASE, [xSELF, #THREAD_CURRENT_IBASE_OFFSET]
59
60    /* Set up for backwards branches & osr profiling */
61    ldr     x0, [xFP, #OFF_FP_METHOD]
62    add     x1, xFP, #OFF_FP_SHADOWFRAME
63    bl      MterpSetUpHotnessCountdown
64    mov     wPROFILE, w0                // Starting hotness countdown to xPROFILE
65
66    /* start executing the instruction at rPC */
67    FETCH_INST                          // load wINST from rPC
68    GET_INST_OPCODE ip                  // extract opcode from wINST
69    GOTO_OPCODE ip                      // jump to next instruction
70    /* NOTE: no fallthrough */
71