1/*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2014-2017 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#include "py/mpstate.h"
28
29#if MICROPY_NLR_XTENSA
30
31#undef nlr_push
32
33// Xtensa calling conventions:
34// a0 = return address
35// a1 = stack pointer
36// a2 = first arg, return value
37// a3-a7 = rest of args
38
39unsigned int nlr_push(nlr_buf_t *nlr) {
40
41 __asm volatile (
42 "s32i.n a0, a2, 8 \n" // save regs...
43 "s32i.n a1, a2, 12 \n"
44 "s32i.n a8, a2, 16 \n"
45 "s32i.n a9, a2, 20 \n"
46 "s32i.n a10, a2, 24 \n"
47 "s32i.n a11, a2, 28 \n"
48 "s32i.n a12, a2, 32 \n"
49 "s32i.n a13, a2, 36 \n"
50 "s32i.n a14, a2, 40 \n"
51 "s32i.n a15, a2, 44 \n"
52 "j nlr_push_tail \n" // do the rest in C
53 );
54
55 return 0; // needed to silence compiler warning
56}
57
58NORETURN void nlr_jump(void *val) {
59 MP_NLR_JUMP_HEAD(val, top)
60
61 __asm volatile (
62 "mov.n a2, %0 \n" // a2 points to nlr_buf
63 "l32i.n a0, a2, 8 \n" // restore regs...
64 "l32i.n a1, a2, 12 \n"
65 "l32i.n a8, a2, 16 \n"
66 "l32i.n a9, a2, 20 \n"
67 "l32i.n a10, a2, 24 \n"
68 "l32i.n a11, a2, 28 \n"
69 "l32i.n a12, a2, 32 \n"
70 "l32i.n a13, a2, 36 \n"
71 "l32i.n a14, a2, 40 \n"
72 "l32i.n a15, a2, 44 \n"
73 "movi.n a2, 1 \n" // return 1, non-local return
74 "ret.n \n" // return
75 : // output operands
76 : "r" (top) // input operands
77 : // clobbered registers
78 );
79
80 MP_UNREACHABLE
81}
82
83#endif // MICROPY_NLR_XTENSA
84