github.com/code-reading/golang@v0.0.0-20220303082512-ba5bc0e589a3/go/src/runtime/cgo/asm_mips64x.s (about)

     1  // Copyright 2016 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  //go:build mips64 || mips64le
     6  // +build mips64 mips64le
     7  
     8  #include "textflag.h"
     9  
    10  // Called by C code generated by cmd/cgo.
    11  // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
    12  // Saves C callee-saved registers and calls cgocallback with three arguments.
    13  // fn is the PC of a func(a unsafe.Pointer) function.
    14  TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
    15  	/*
    16  	 * We still need to save all callee save register as before, and then
    17  	 *  push 3 args for fn (R4, R5, R7), skipping R6.
    18  	 * Also note that at procedure entry in gc world, 8(R29) will be the
    19  	 *  first arg.
    20  	 */
    21  #ifndef GOMIPS64_softfloat
    22  	ADDV	$(-8*23), R29
    23  #else
    24  	ADDV	$(-8*15), R29
    25  #endif
    26  	MOVV	R4, (8*1)(R29) // fn unsafe.Pointer
    27  	MOVV	R5, (8*2)(R29) // a unsafe.Pointer
    28  	MOVV	R7, (8*3)(R29) // ctxt uintptr
    29  	MOVV	R16, (8*4)(R29)
    30  	MOVV	R17, (8*5)(R29)
    31  	MOVV	R18, (8*6)(R29)
    32  	MOVV	R19, (8*7)(R29)
    33  	MOVV	R20, (8*8)(R29)
    34  	MOVV	R21, (8*9)(R29)
    35  	MOVV	R22, (8*10)(R29)
    36  	MOVV	R23, (8*11)(R29)
    37  	MOVV	RSB, (8*12)(R29)
    38  	MOVV	g, (8*13)(R29)
    39  	MOVV	R31, (8*14)(R29)
    40  #ifndef GOMIPS64_softfloat
    41  	MOVD	F24, (8*15)(R29)
    42  	MOVD	F25, (8*16)(R29)
    43  	MOVD	F26, (8*17)(R29)
    44  	MOVD	F27, (8*18)(R29)
    45  	MOVD	F28, (8*19)(R29)
    46  	MOVD	F29, (8*20)(R29)
    47  	MOVD	F30, (8*21)(R29)
    48  	MOVD	F31, (8*22)(R29)
    49  #endif
    50  	// Initialize Go ABI environment
    51  	// prepare SB register = PC & 0xffffffff00000000
    52  	BGEZAL	R0, 1(PC)
    53  	SRLV	$32, R31, RSB
    54  	SLLV	$32, RSB
    55  	JAL	runtime·load_g(SB)
    56  
    57  	JAL	runtime·cgocallback(SB)
    58  
    59  	MOVV	(8*4)(R29), R16
    60  	MOVV	(8*5)(R29), R17
    61  	MOVV	(8*6)(R29), R18
    62  	MOVV	(8*7)(R29), R19
    63  	MOVV	(8*8)(R29), R20
    64  	MOVV	(8*9)(R29), R21
    65  	MOVV	(8*10)(R29), R22
    66  	MOVV	(8*11)(R29), R23
    67  	MOVV	(8*12)(R29), RSB
    68  	MOVV	(8*13)(R29), g
    69  	MOVV	(8*14)(R29), R31
    70  #ifndef GOMIPS64_softfloat
    71  	MOVD	(8*15)(R29), F24
    72  	MOVD	(8*16)(R29), F25
    73  	MOVD	(8*17)(R29), F26
    74  	MOVD	(8*18)(R29), F27
    75  	MOVD	(8*19)(R29), F28
    76  	MOVD	(8*20)(R29), F29
    77  	MOVD	(8*21)(R29), F30
    78  	MOVD	(8*22)(R29), F31
    79  	ADDV	$(8*23), R29
    80  #else
    81  	ADDV	$(8*15), R29
    82  #endif
    83  	RET