1// Copyright 2016 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5//go:build mips64 || mips64le
6
7.file "gcc_mips64x.S"
8
9/*
10 * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
11 *
12 * Calling into the gc tool chain, where all registers are caller save.
13 * Called from standard MIPS N64 ABI, where $16-$23, $28, $30, and $f24-$f31
14 * are callee-save, so they must be saved explicitly, along with $31 (LR).
15 */
16.globl crosscall1
17.set noat
18crosscall1:
19#ifndef __mips_soft_float
20	daddiu	$29, $29, -160
21#else
22	daddiu	$29, $29, -96 // For soft-float, no need to make room for FP registers
23#endif
24	sd	$31, 0($29)
25	sd	$16, 8($29)
26	sd	$17, 16($29)
27	sd	$18, 24($29)
28	sd	$19, 32($29)
29	sd	$20, 40($29)
30	sd	$21, 48($29)
31	sd	$22, 56($29)
32	sd	$23, 64($29)
33	sd	$28, 72($29)
34	sd	$30, 80($29)
35#ifndef __mips_soft_float
36	sdc1	$f24, 88($29)
37	sdc1	$f25, 96($29)
38	sdc1	$f26, 104($29)
39	sdc1	$f27, 112($29)
40	sdc1	$f28, 120($29)
41	sdc1	$f29, 128($29)
42	sdc1	$f30, 136($29)
43	sdc1	$f31, 144($29)
44#endif
45
46	// prepare SB register = pc & 0xffffffff00000000
47	bal	1f
481:
49	dsrl	$28, $31, 32
50	dsll	$28, $28, 32
51
52	move	$20, $4 // save R4
53	move	$1, $6
54	jalr	$5	// call setg_gcc (clobbers R4)
55	jalr	$20	// call fn
56
57	ld	$16, 8($29)
58	ld	$17, 16($29)
59	ld	$18, 24($29)
60	ld	$19, 32($29)
61	ld	$20, 40($29)
62	ld	$21, 48($29)
63	ld	$22, 56($29)
64	ld	$23, 64($29)
65	ld	$28, 72($29)
66	ld	$30, 80($29)
67#ifndef __mips_soft_float
68	ldc1	$f24, 88($29)
69	ldc1	$f25, 96($29)
70	ldc1	$f26, 104($29)
71	ldc1	$f27, 112($29)
72	ldc1	$f28, 120($29)
73	ldc1	$f29, 128($29)
74	ldc1	$f30, 136($29)
75	ldc1	$f31, 144($29)
76#endif
77	ld	$31, 0($29)
78#ifndef __mips_soft_float
79	daddiu	$29, $29, 160
80#else
81	daddiu	$29, $29, 96
82#endif
83	jr	$31
84
85.set at
86
87#ifdef __ELF__
88.section .note.GNU-stack,"",%progbits
89#endif
90