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#include "textflag.h"
6#include "cgo/abi_arm64.h"
7
8TEXT _rt0_arm64_darwin(SB),NOSPLIT|NOFRAME,$0
9	MOVD	$runtime·rt0_go(SB), R2
10	BL	(R2)
11exit:
12	MOVD	$0, R0
13	MOVD	$1, R16	// sys_exit
14	SVC	$0x80
15	B	exit
16
17// When linking with -buildmode=c-archive or -buildmode=c-shared,
18// this symbol is called from a global initialization function.
19//
20// Note that all currently shipping darwin/arm64 platforms require
21// cgo and do not support c-shared.
22TEXT _rt0_arm64_darwin_lib(SB),NOSPLIT,$152
23	// Preserve callee-save registers.
24	SAVE_R19_TO_R28(8)
25	SAVE_F8_TO_F15(88)
26
27	MOVD  R0, _rt0_arm64_darwin_lib_argc<>(SB)
28	MOVD  R1, _rt0_arm64_darwin_lib_argv<>(SB)
29
30	MOVD	$0, g // initialize g to nil
31
32	// Synchronous initialization.
33	MOVD	$runtime·libpreinit(SB), R4
34	BL	(R4)
35
36	// Create a new thread to do the runtime initialization and return.
37	MOVD  _cgo_sys_thread_create(SB), R4
38	MOVD  $_rt0_arm64_darwin_lib_go(SB), R0
39	MOVD  $0, R1
40	SUB   $16, RSP		// reserve 16 bytes for sp-8 where fp may be saved.
41	BL    (R4)
42	ADD   $16, RSP
43
44	// Restore callee-save registers.
45	RESTORE_R19_TO_R28(8)
46	RESTORE_F8_TO_F15(88)
47
48	RET
49
50TEXT _rt0_arm64_darwin_lib_go(SB),NOSPLIT,$0
51	MOVD  _rt0_arm64_darwin_lib_argc<>(SB), R0
52	MOVD  _rt0_arm64_darwin_lib_argv<>(SB), R1
53	MOVD  $runtime·rt0_go(SB), R4
54	B     (R4)
55
56DATA  _rt0_arm64_darwin_lib_argc<>(SB)/8, $0
57GLOBL _rt0_arm64_darwin_lib_argc<>(SB),NOPTR, $8
58DATA  _rt0_arm64_darwin_lib_argv<>(SB)/8, $0
59GLOBL _rt0_arm64_darwin_lib_argv<>(SB),NOPTR, $8
60
61// external linking entry point.
62TEXT main(SB),NOSPLIT|NOFRAME,$0
63	JMP	_rt0_arm64_darwin(SB)
64