1// Copyright 2015 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.file "gcc_arm64.S"
6
7/*
8 * Apple still insists on underscore prefixes for C function names.
9 */
10#if defined(__APPLE__)
11#define EXT(s) _##s
12#else
13#define EXT(s) s
14#endif
15
16// Apple's ld64 wants 4-byte alignment for ARM code sections.
17// .align in both Apple as and GNU as treat n as aligning to 2**n bytes.
18.align	2
19
20/*
21 * void crosscall1(void (*fn)(void), void (*setg_gcc)(void *g), void *g)
22 *
23 * Calling into the gc tool chain, where all registers are caller save.
24 * Called from standard ARM EABI, where x19-x29 are callee-save, so they
25 * must be saved explicitly, along with x30 (LR).
26 */
27.globl EXT(crosscall1)
28EXT(crosscall1):
29	.cfi_startproc
30	stp x29, x30, [sp, #-96]!
31	.cfi_def_cfa_offset 96
32	.cfi_offset 29, -96
33	.cfi_offset 30, -88
34	mov x29, sp
35	.cfi_def_cfa_register 29
36	stp x19, x20, [sp, #80]
37	.cfi_offset 19, -16
38	.cfi_offset 20, -8
39	stp x21, x22, [sp, #64]
40	.cfi_offset 21, -32
41	.cfi_offset 22, -24
42	stp x23, x24, [sp, #48]
43	.cfi_offset 23, -48
44	.cfi_offset 24, -40
45	stp x25, x26, [sp, #32]
46	.cfi_offset 25, -64
47	.cfi_offset 26, -56
48	stp x27, x28, [sp, #16]
49	.cfi_offset 27, -80
50	.cfi_offset 28, -72
51
52	mov x19, x0
53	mov x20, x1
54	mov x0, x2
55
56	blr x20
57	blr x19
58
59	ldp x27, x28, [sp, #16]
60	.cfi_restore 27
61	.cfi_restore 28
62	ldp x25, x26, [sp, #32]
63	.cfi_restore 25
64	.cfi_restore 26
65	ldp x23, x24, [sp, #48]
66	.cfi_restore 23
67	.cfi_restore 24
68	ldp x21, x22, [sp, #64]
69	.cfi_restore 21
70	.cfi_restore 22
71	ldp x19, x20, [sp, #80]
72	.cfi_restore 19
73	.cfi_restore 20
74	ldp x29, x30, [sp], #96
75	.cfi_restore 29
76	.cfi_restore 30
77	.cfi_def_cfa 31, 0
78	ret
79	.cfi_endproc
80
81
82#ifdef __ELF__
83.section .note.GNU-stack,"",%progbits
84#endif
85