rt0_openbsd_mips64.s

     1  // Copyright 2020 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_mips64_openbsd(SB),NOSPLIT,$0
     8  	JMP	_main<>(SB)
     9  
    10  TEXT _rt0_mips64le_openbsd(SB),NOSPLIT,$0
    11  	JMP	_main<>(SB)
    12  
    13  TEXT _main<>(SB),NOSPLIT|NOFRAME,$0
    14  	// In a statically linked binary, the stack contains argc,
    15  	// argv as argc string pointers followed by a NULL, envv as a
    16  	// sequence of string pointers followed by a NULL, and auxv.
    17  	// There is no TLS base pointer.
    18  #ifdef GOARCH_mips64
    19  	MOVW	4(R29), R4 // argc, big-endian ABI places int32 at offset 4
    20  #else
    21  	MOVW	0(R29), R4 // argc
    22  #endif
    23  	ADDV	$8, R29, R5 // argv
    24  	JMP	main(SB)
    25  
    26  TEXT main(SB),NOSPLIT|NOFRAME,$0
    27  	// in external linking, glibc jumps to main with argc in R4
    28  	// and argv in R5
    29  
    30  	// initialize REGSB = PC&0xffffffff00000000
    31  	BGEZAL	R0, 1(PC)
    32  	SRLV	$32, R31, RSB
    33  	SLLV	$32, RSB
    34  
    35  	MOVV	$runtime·rt0_go(SB), R1
    36  	JMP	(R1)
    37
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