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1// Copyright 2019 The Marl Authors.
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//     https://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#if defined(__aarch64__)
16
17#define MARL_BUILD_ASM 1
18#include "osfiber_asm_aarch64.h"
19
20// void marl_fiber_swap(marl_fiber_context* from, const marl_fiber_context* to)
21// x0: from
22// x1: to
23.text
24.global MARL_ASM_SYMBOL(marl_fiber_swap)
25.align 4
26MARL_ASM_SYMBOL(marl_fiber_swap):
27
28    // Save context 'from'
29    // TODO: pairs of str can be combined with stp.
30
31    // Store special purpose registers
32    str x16, [x0, #MARL_REG_r16]
33    str x17, [x0, #MARL_REG_r17]
34    str x18, [x0, #MARL_REG_r18]
35
36    // Store callee-preserved registers
37    str x19, [x0, #MARL_REG_r19]
38    str x20, [x0, #MARL_REG_r20]
39    str x21, [x0, #MARL_REG_r21]
40    str x22, [x0, #MARL_REG_r22]
41    str x23, [x0, #MARL_REG_r23]
42    str x24, [x0, #MARL_REG_r24]
43    str x25, [x0, #MARL_REG_r25]
44    str x26, [x0, #MARL_REG_r26]
45    str x27, [x0, #MARL_REG_r27]
46    str x28, [x0, #MARL_REG_r28]
47    str x29, [x0, #MARL_REG_r29]
48
49    str d8,  [x0, #MARL_REG_v8]
50    str d9,  [x0, #MARL_REG_v9]
51    str d10, [x0, #MARL_REG_v10]
52    str d11, [x0, #MARL_REG_v11]
53    str d12, [x0, #MARL_REG_v12]
54    str d13, [x0, #MARL_REG_v13]
55    str d14, [x0, #MARL_REG_v14]
56    str d15, [x0, #MARL_REG_v15]
57
58    // Store sp and lr
59    mov x2, sp
60    str x2,  [x0, #MARL_REG_SP]
61    str x30, [x0, #MARL_REG_LR]
62
63    // Load context 'to'
64    mov x7, x1
65
66    // Load special purpose registers
67    ldr x16, [x7, #MARL_REG_r16]
68    ldr x17, [x7, #MARL_REG_r17]
69    ldr x18, [x7, #MARL_REG_r18]
70
71    // Load callee-preserved registers
72    ldr x19, [x7, #MARL_REG_r19]
73    ldr x20, [x7, #MARL_REG_r20]
74    ldr x21, [x7, #MARL_REG_r21]
75    ldr x22, [x7, #MARL_REG_r22]
76    ldr x23, [x7, #MARL_REG_r23]
77    ldr x24, [x7, #MARL_REG_r24]
78    ldr x25, [x7, #MARL_REG_r25]
79    ldr x26, [x7, #MARL_REG_r26]
80    ldr x27, [x7, #MARL_REG_r27]
81    ldr x28, [x7, #MARL_REG_r28]
82    ldr x29, [x7, #MARL_REG_r29]
83
84    ldr d8,  [x7, #MARL_REG_v8]
85    ldr d9,  [x7, #MARL_REG_v9]
86    ldr d10, [x7, #MARL_REG_v10]
87    ldr d11, [x7, #MARL_REG_v11]
88    ldr d12, [x7, #MARL_REG_v12]
89    ldr d13, [x7, #MARL_REG_v13]
90    ldr d14, [x7, #MARL_REG_v14]
91    ldr d15, [x7, #MARL_REG_v15]
92
93    // Load parameter registers
94    ldr x0, [x7, #MARL_REG_r0]
95    ldr x1, [x7, #MARL_REG_r1]
96
97    // Load sp and lr
98    ldr x30, [x7, #MARL_REG_LR]
99    ldr x2,  [x7, #MARL_REG_SP]
100    mov sp, x2
101
102    ret
103
104#endif // defined(__aarch64__)
105