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_linux(SB),NOSPLIT|NOFRAME,$0
9	MOVD	0(RSP), R0	// argc
10	ADD	$8, RSP, R1	// argv
11	BL	main(SB)
12
13// When building with -buildmode=c-shared, this symbol is called when the shared
14// library is loaded.
15TEXT _rt0_arm64_linux_lib(SB),NOSPLIT,$184
16	// Preserve callee-save registers.
17	SAVE_R19_TO_R28(24)
18	SAVE_F8_TO_F15(104)
19
20	// Initialize g as null in case of using g later e.g. sigaction in cgo_sigaction.go
21	MOVD	ZR, g
22
23	MOVD	R0, _rt0_arm64_linux_lib_argc<>(SB)
24	MOVD	R1, _rt0_arm64_linux_lib_argv<>(SB)
25
26	// Synchronous initialization.
27	MOVD	$runtime·libpreinit(SB), R4
28	BL	(R4)
29
30	// Create a new thread to do the runtime initialization and return.
31	MOVD	_cgo_sys_thread_create(SB), R4
32	CBZ	R4, nocgo
33	MOVD	$_rt0_arm64_linux_lib_go(SB), R0
34	MOVD	$0, R1
35	SUB	$16, RSP		// reserve 16 bytes for sp-8 where fp may be saved.
36	BL	(R4)
37	ADD	$16, RSP
38	B	restore
39
40nocgo:
41	MOVD	$0x800000, R0                     // stacksize = 8192KB
42	MOVD	$_rt0_arm64_linux_lib_go(SB), R1
43	MOVD	R0, 8(RSP)
44	MOVD	R1, 16(RSP)
45	MOVD	$runtime·newosproc0(SB),R4
46	BL	(R4)
47
48restore:
49	// Restore callee-save registers.
50	RESTORE_R19_TO_R28(24)
51	RESTORE_F8_TO_F15(104)
52	RET
53
54TEXT _rt0_arm64_linux_lib_go(SB),NOSPLIT,$0
55	MOVD	_rt0_arm64_linux_lib_argc<>(SB), R0
56	MOVD	_rt0_arm64_linux_lib_argv<>(SB), R1
57	MOVD	$runtime·rt0_go(SB),R4
58	B       (R4)
59
60DATA _rt0_arm64_linux_lib_argc<>(SB)/8, $0
61GLOBL _rt0_arm64_linux_lib_argc<>(SB),NOPTR, $8
62DATA _rt0_arm64_linux_lib_argv<>(SB)/8, $0
63GLOBL _rt0_arm64_linux_lib_argv<>(SB),NOPTR, $8
64
65
66TEXT main(SB),NOSPLIT|NOFRAME,$0
67	MOVD	$runtime·rt0_go(SB), R2
68	BL	(R2)
69exit:
70	MOVD $0, R0
71	MOVD	$94, R8	// sys_exit
72	SVC
73	B	exit
74