github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/rt0_linux_loong64.s (about)

     1  // Copyright 2022 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_loong64.h"
     7  
     8  TEXT _rt0_loong64_linux(SB),NOSPLIT|NOFRAME,$0
     9  	// In a statically linked binary, the stack contains argc,
    10  	// argv as argc string pointers followed by a NULL, envv as a
    11  	// sequence of string pointers followed by a NULL, and auxv.
    12  	// There is no TLS base pointer.
    13  	MOVW	0(R3), R4	// argc
    14  	ADDV	$8, R3, R5	// argv
    15  	JMP	main(SB)
    16  
    17  // When building with -buildmode=c-shared, this symbol is called when the shared
    18  // library is loaded.
    19  TEXT _rt0_loong64_linux_lib(SB),NOSPLIT,$168
    20  	// Preserve callee-save registers.
    21  	SAVE_R22_TO_R31(3*8)
    22  	SAVE_F24_TO_F31(13*8)
    23  
    24  	// Initialize g as nil in case of using g later e.g. sigaction in cgo_sigaction.go
    25  	MOVV	R0, g
    26  
    27  	MOVV	R4, _rt0_loong64_linux_lib_argc<>(SB)
    28  	MOVV	R5, _rt0_loong64_linux_lib_argv<>(SB)
    29  
    30  	// Synchronous initialization.
    31  	MOVV	$runtime·libpreinit(SB), R19
    32  	JAL	(R19)
    33  
    34  	// Create a new thread to do the runtime initialization and return.
    35  	MOVV	_cgo_sys_thread_create(SB), R19
    36  	BEQ	R19, nocgo
    37  	MOVV	$_rt0_loong64_linux_lib_go(SB), R4
    38  	MOVV	$0, R5
    39  	JAL	(R19)
    40  	JMP	restore
    41  
    42  nocgo:
    43  	MOVV	$0x800000, R4                     // stacksize = 8192KB
    44  	MOVV	$_rt0_loong64_linux_lib_go(SB), R5
    45  	MOVV	R4, 8(R3)
    46  	MOVV	R5, 16(R3)
    47  	MOVV	$runtime·newosproc0(SB), R19
    48  	JAL	(R19)
    49  
    50  restore:
    51  	// Restore callee-save registers.
    52  	RESTORE_R22_TO_R31(3*8)
    53  	RESTORE_F24_TO_F31(13*8)
    54  	RET
    55  
    56  TEXT _rt0_loong64_linux_lib_go(SB),NOSPLIT,$0
    57  	MOVV	_rt0_loong64_linux_lib_argc<>(SB), R4
    58  	MOVV	_rt0_loong64_linux_lib_argv<>(SB), R5
    59  	MOVV	$runtime·rt0_go(SB),R19
    60  	JMP	(R19)
    61  
    62  DATA _rt0_loong64_linux_lib_argc<>(SB)/8, $0
    63  GLOBL _rt0_loong64_linux_lib_argc<>(SB),NOPTR, $8
    64  DATA _rt0_loong64_linux_lib_argv<>(SB)/8, $0
    65  GLOBL _rt0_loong64_linux_lib_argv<>(SB),NOPTR, $8
    66  
    67  TEXT main(SB),NOSPLIT|NOFRAME,$0
    68  	// in external linking, glibc jumps to main with argc in R4
    69  	// and argv in R5
    70  
    71  	MOVV	$runtime·rt0_go(SB), R19
    72  	JMP	(R19)