github.com/likebike/go--@v0.0.0-20190911215757-0bd925d16e96/go/src/runtime/rt0_linux_arm64.s (about)

     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  
     7  TEXT _rt0_arm64_linux(SB),NOSPLIT,$-8
     8  	MOVD	0(RSP), R0	// argc
     9  	ADD	$8, RSP, R1	// argv
    10  	BL	main(SB)
    11  
    12  // When building with -buildmode=c-shared, this symbol is called when the shared
    13  // library is loaded.
    14  TEXT _rt0_arm64_linux_lib(SB),NOSPLIT,$168
    15  	// Preserve callee-save registers.
    16  	MOVD R19, 24(RSP)
    17  	MOVD R20, 32(RSP)
    18  	MOVD R21, 40(RSP)
    19  	MOVD R22, 48(RSP)
    20  	MOVD R23, 56(RSP)
    21  	MOVD R24, 64(RSP)
    22  	MOVD R25, 72(RSP)
    23  	MOVD R26, 80(RSP)
    24  	MOVD R27, 88(RSP)
    25  	FMOVD F8, 96(RSP)
    26  	FMOVD F9, 104(RSP)
    27  	FMOVD F10, 112(RSP)
    28  	FMOVD F11, 120(RSP)
    29  	FMOVD F12, 128(RSP)
    30  	FMOVD F13, 136(RSP)
    31  	FMOVD F14, 144(RSP)
    32  	FMOVD F15, 152(RSP)
    33  
    34  	MOVD	R0, _rt0_arm64_linux_lib_argc<>(SB)
    35  	MOVD	R1, _rt0_arm64_linux_lib_argv<>(SB)
    36  
    37  	// Synchronous initialization.
    38  	MOVD	$runtime·libpreinit(SB), R4
    39  	BL	(R4)
    40  
    41  	// Create a new thread to do the runtime initialization and return.
    42  	MOVD	_cgo_sys_thread_create(SB), R4
    43  	CMP	$0, R4
    44  	BEQ	nocgo
    45  	MOVD	$_rt0_arm64_linux_lib_go(SB), R0
    46  	MOVD	$0, R1
    47  	BL	(R4)
    48  	B	restore
    49  
    50  nocgo:
    51  	MOVD	$0x800000, R0                     // stacksize = 8192KB
    52  	MOVD	$_rt0_arm64_linux_lib_go(SB), R1
    53  	MOVD	R0, 8(RSP)
    54  	MOVD	R1, 16(RSP)
    55  	MOVD	$runtime·newosproc0(SB),R4
    56  	BL	(R4)
    57  
    58  restore:
    59  	// Restore callee-save registers.
    60  	MOVD 24(RSP), R19
    61  	MOVD 32(RSP), R20
    62  	MOVD 40(RSP), R21
    63  	MOVD 48(RSP), R22
    64  	MOVD 56(RSP), R23
    65  	MOVD 64(RSP), R24
    66  	MOVD 72(RSP), R25
    67  	MOVD 80(RSP), R26
    68  	MOVD 88(RSP), R27
    69  	FMOVD 96(RSP), F8
    70  	FMOVD 104(RSP), F9
    71  	FMOVD 112(RSP), F10
    72  	FMOVD 120(RSP), F11
    73  	FMOVD 128(RSP), F12
    74  	FMOVD 136(RSP), F13
    75  	FMOVD 144(RSP), F14
    76  	FMOVD 152(RSP), F15
    77  	RET
    78  
    79  TEXT _rt0_arm64_linux_lib_go(SB),NOSPLIT,$0
    80  	MOVD	_rt0_arm64_linux_lib_argc<>(SB), R0
    81  	MOVD	_rt0_arm64_linux_lib_argv<>(SB), R1
    82  	MOVD	$runtime·rt0_go(SB),R4
    83  	B       (R4)
    84  
    85  DATA _rt0_arm64_linux_lib_argc<>(SB)/8, $0
    86  GLOBL _rt0_arm64_linux_lib_argc<>(SB),NOPTR, $8
    87  DATA _rt0_arm64_linux_lib_argv<>(SB)/8, $0
    88  GLOBL _rt0_arm64_linux_lib_argv<>(SB),NOPTR, $8
    89  
    90  
    91  TEXT main(SB),NOSPLIT,$-8
    92  	MOVD	$runtime·rt0_go(SB), R2
    93  	BL	(R2)
    94  exit:
    95  	MOVD $0, R0
    96  	MOVD	$94, R8	// sys_exit
    97  	SVC
    98  	B	exit