rt0_darwin_arm64.s

Documentation: runtime

     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)
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