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review.linaro.org / lite / micropython / e72cda99fd5fc9e7c6476eb8574c4401d3ef9560 / . / py / nlrxtensa.S
blob: 289996ccee346cb1ff4903026896a6863a686472 [file] [log] [blame]
Damien George2399aa02014-11-27 20:29:33 +0000[diff] [blame]1/*
2 * This file is part of the Micro Python project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2014 Damien P. George
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27#if defined(__xtensa__)
28
29/*
30 calling conventions:
31 a0 = return address
32 a1 = stack pointer
33 a2 = first arg, return value
34 a3-a7 = rest of args
35*/
36
Damien Georgeb4b10fd2015-01-01 23:30:53 +0000[diff] [blame]37// the offset of nlr_top within mp_state_ctx_t
38#define NLR_TOP_OFFSET (2 * 4)
39
40#define NLR_TOP (mp_state_ctx + NLR_TOP_OFFSET)
41
Damien George2399aa02014-11-27 20:29:33 +0000[diff] [blame]42 .file "nlr.s"
43 .text
44
45 .literal_position
Damien Georgeb4b10fd2015-01-01 23:30:53 +0000[diff] [blame]46 .literal .LC0, NLR_TOP
Damien George2399aa02014-11-27 20:29:33 +0000[diff] [blame]47 .align 4
48 .global nlr_push
49 .type nlr_push, @function
50nlr_push:
51 // save regs
52 s32i.n a0, a2, 8
53 s32i.n a1, a2, 12
54 s32i.n a8, a2, 16
55 s32i.n a9, a2, 20
56 s32i.n a10, a2, 24
57 s32i.n a11, a2, 28
58 s32i.n a12, a2, 32
59 s32i.n a13, a2, 36
60 s32i.n a14, a2, 40
61 s32i.n a15, a2, 44
62
63 l32r a3, .LC0
64 l32i.n a4, a3, 0
65 s32i.n a2, a3, 0
66 s32i.n a4, a2, 0
67 movi.n a2, 0
68 ret.n
69 .size nlr_push, .-nlr_push
70
71 .literal_position
Damien Georgeb4b10fd2015-01-01 23:30:53 +0000[diff] [blame]72 .literal .LC1, NLR_TOP
Damien George2399aa02014-11-27 20:29:33 +0000[diff] [blame]73 .align 4
74 .global nlr_pop
75 .type nlr_pop, @function
76nlr_pop:
77 l32r a2, .LC1
78 l32i.n a3, a2, 0
79 l32i.n a3, a3, 0
80 s32i.n a3, a2, 0
81 ret.n
82 .size nlr_pop, .-nlr_pop
83
84 .literal_position
Damien Georgeb4b10fd2015-01-01 23:30:53 +0000[diff] [blame]85 .literal .LC2, NLR_TOP
Damien George2399aa02014-11-27 20:29:33 +0000[diff] [blame]86 .align 4
87 .global nlr_jump
88 .type nlr_jump, @function
89nlr_jump:
90 l32r a3, .LC2
91 l32i.n a3, a3, 0 // a3 = nlr_top
92 bnez.n a3, .L4
93 call0 nlr_jump_fail
94.L4:
95 s32i.n a2, a3, 4 // nlr_top->ret_val = val
96
97 // restore regs
98 l32i.n a0, a3, 8
99 l32i.n a1, a3, 12
100 l32i.n a8, a3, 16
101 l32i.n a9, a3, 20
102 l32i.n a10, a3, 24
103 l32i.n a11, a3, 28
104 l32i.n a12, a3, 32
105 l32i.n a13, a3, 36
106 l32i.n a14, a3, 40
107 l32i.n a15, a3, 44
108
109 l32i.n a3, a3, 0 // a3 = nlr_top->prev
110 l32r a2, .LC2
111 s32i.n a3, a2, 0 // nlr_top = a3
112 movi.n a2, 1 // return 1
113 ret.n
114 .size nlr_jump, .-nlr_jump
115
Damien George2399aa02014-11-27 20:29:33 +0000[diff] [blame]116#endif // defined(__xtensa__)