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 * Interpreter entry point.
18 */
19
20    .text
21    .align 2
22    .global ExecuteMterpImpl
23    .ent    ExecuteMterpImpl
24    .frame sp, STACK_SIZE, ra
25/*
26 * On entry:
27 *  a0  Thread* self
28 *  a1  code_item
29 *  a2  ShadowFrame
30 *  a3  JValue* result_register
31 *
32 */
33
34ExecuteMterpImpl:
35    .set noreorder
36    .cpload t9
37    .set reorder
38/* Save to the stack. Frame size = STACK_SIZE */
39    STACK_STORE_FULL()
40/* This directive will make sure all subsequent jal restore gp at a known offset */
41    .cprestore STACK_OFFSET_GP
42
43    /* Remember the return register */
44    sw      a3, SHADOWFRAME_RESULT_REGISTER_OFFSET(a2)
45
46    /* Remember the code_item */
47    sw      a1, SHADOWFRAME_CODE_ITEM_OFFSET(a2)
48
49    /* set up "named" registers */
50    move    rSELF, a0
51    lw      a0, SHADOWFRAME_NUMBER_OF_VREGS_OFFSET(a2)
52    addu    rFP, a2, SHADOWFRAME_VREGS_OFFSET     # point to vregs.
53    EAS2(rREFS, rFP, a0)                          # point to reference array in shadow frame
54    lw      a0, SHADOWFRAME_DEX_PC_OFFSET(a2)     # Get starting dex_pc
55    addu    rPC, a1, CODEITEM_INSNS_OFFSET        # Point to base of insns[]
56    EAS1(rPC, rPC, a0)                            # Create direct pointer to 1st dex opcode
57
58    EXPORT_PC()
59
60    /* Starting ibase */
61    lw      rIBASE, THREAD_CURRENT_IBASE_OFFSET(rSELF)
62
63    /* Set up for backwards branches & osr profiling */
64    lw      a0, OFF_FP_METHOD(rFP)
65    addu    a1, rFP, OFF_FP_SHADOWFRAME
66    JAL(MterpSetUpHotnessCountdown)        # (method, shadow_frame)
67    move    rPROFILE, v0                   # Starting hotness countdown to rPROFILE
68
69    /* start executing the instruction at rPC */
70    FETCH_INST()                           # load rINST from rPC
71    GET_INST_OPCODE(t0)                    # extract opcode from rINST
72    GOTO_OPCODE(t0)                        # jump to next instruction
73    /* NOTE: no fallthrough */
74