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
23/*
24 * On entry:
25 *  r0  Thread* self/
26 *  r1  insns_
27 *  r2  ShadowFrame
28 *  r3  JValue* result_register
29 *
30 */
31
32ENTRY ExecuteMterpImpl
33    stmfd   sp!, {r3-r10,fp,lr}         @ save 10 regs, (r3 just to align 64)
34    .cfi_adjust_cfa_offset 40
35    .cfi_rel_offset r3, 0
36    .cfi_rel_offset r4, 4
37    .cfi_rel_offset r5, 8
38    .cfi_rel_offset r6, 12
39    .cfi_rel_offset r7, 16
40    .cfi_rel_offset r8, 20
41    .cfi_rel_offset r9, 24
42    .cfi_rel_offset r10, 28
43    .cfi_rel_offset fp, 32
44    .cfi_rel_offset lr, 36
45
46    /* Remember the return register */
47    str     r3, [r2, #SHADOWFRAME_RESULT_REGISTER_OFFSET]
48
49    /* Remember the dex instruction pointer */
50    str     r1, [r2, #SHADOWFRAME_DEX_INSTRUCTIONS_OFFSET]
51
52    /* set up "named" registers */
53    mov     rSELF, r0
54    ldr     r0, [r2, #SHADOWFRAME_NUMBER_OF_VREGS_OFFSET]
55    add     rFP, r2, #SHADOWFRAME_VREGS_OFFSET     @ point to vregs.
56    VREG_INDEX_TO_ADDR rREFS, r0                   @ point to reference array in shadow frame
57    ldr     r0, [r2, #SHADOWFRAME_DEX_PC_OFFSET]   @ Get starting dex_pc.
58    add     rPC, r1, r0, lsl #1                    @ Create direct pointer to 1st dex opcode
59    CFI_DEFINE_DEX_PC_WITH_OFFSET(CFI_TMP, CFI_DEX, 0)
60    EXPORT_PC
61
62    /* Starting ibase */
63    ldr     rIBASE, [rSELF, #THREAD_CURRENT_IBASE_OFFSET]
64
65    /* Set up for backwards branches & osr profiling */
66    ldr     r0, [rFP, #OFF_FP_METHOD]
67    add     r1, rFP, #OFF_FP_SHADOWFRAME
68    mov     r2, rSELF
69    bl      MterpSetUpHotnessCountdown
70    mov     rPROFILE, r0                @ Starting hotness countdown to rPROFILE
71
72    /* start executing the instruction at rPC */
73    FETCH_INST                          @ load rINST from rPC
74    GET_INST_OPCODE ip                  @ extract opcode from rINST
75    GOTO_OPCODE ip                      @ jump to next instruction
76    /* NOTE: no fallthrough */
77