rt0_darwin_arm64.s

     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  
     8  TEXT _rt0_arm64_darwin(SB),NOSPLIT|NOFRAME,$0
     9  	MOVD	$runtime·rt0_go(SB), R2
    10  	BL	(R2)
    11  exit:
    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.
    22  TEXT _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  
    50  TEXT _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  
    56  DATA  _rt0_arm64_darwin_lib_argc<>(SB)/8, $0
    57  GLOBL _rt0_arm64_darwin_lib_argc<>(SB),NOPTR, $8
    58  DATA  _rt0_arm64_darwin_lib_argv<>(SB)/8, $0
    59  GLOBL _rt0_arm64_darwin_lib_argv<>(SB),NOPTR, $8
    60  
    61  // external linking entry point.
    62  TEXT main(SB),NOSPLIT|NOFRAME,$0
    63  	JMP	_rt0_arm64_darwin(SB)
    64
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