github.com/mdempsky/go@v0.0.0-20151201204031-5dd372bd1e70/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,$40
    15  	// R27 is REGTMP, reserved for liblink. It is used below to
    16  	// move R0/R1 into globals. However in the standard ARM64 calling
    17  	// convention, it is a callee-saved register.
    18  	MOVD	R27, 24(RSP)
    19  
    20  	MOVD	R0, _rt0_arm64_linux_lib_argc<>(SB)
    21  	MOVD	R1, _rt0_arm64_linux_lib_argv<>(SB)
    22  
    23  	// Create a new thread to do the runtime initialization and return.
    24  	MOVD	_cgo_sys_thread_create(SB), R4
    25  	CMP	$0, R4
    26  	BEQ	nocgo
    27  	MOVD	$_rt0_arm64_linux_lib_go(SB), R0
    28  	MOVD	$0, R1
    29  	BL	(R4)
    30  	B	restore
    31  
    32  nocgo:
    33  	MOVD	$0x800000, R0                     // stacksize = 8192KB
    34  	MOVD	$_rt0_arm64_linux_lib_go(SB), R1
    35  	MOVD	R0, 8(RSP)
    36  	MOVD	R1, 16(RSP)
    37  	MOVD	$runtime·newosproc0(SB),R4
    38  	BL	(R4)
    39  
    40  restore:
    41  	MOVD	24(RSP), R27
    42  	RET
    43  
    44  TEXT _rt0_arm64_linux_lib_go(SB),NOSPLIT,$0
    45  	MOVD	_rt0_arm64_linux_lib_argc<>(SB), R0
    46  	MOVD	_rt0_arm64_linux_lib_argv<>(SB), R1
    47  	MOVD	$runtime·rt0_go(SB),R4
    48  	B       (R4)
    49  
    50  DATA _rt0_arm64_linux_lib_argc<>(SB)/8, $0
    51  GLOBL _rt0_arm64_linux_lib_argc<>(SB),NOPTR, $8
    52  DATA _rt0_arm64_linux_lib_argv<>(SB)/8, $0
    53  GLOBL _rt0_arm64_linux_lib_argv<>(SB),NOPTR, $8
    54  
    55  
    56  TEXT main(SB),NOSPLIT,$-8
    57  	MOVD	$runtime·rt0_go(SB), R2
    58  	BL	(R2)
    59  exit:
    60  	MOVD $0, R0
    61  	MOVD	$94, R8	// sys_exit
    62  	SVC
    63  	B	exit