github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/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  
     7  #include "textflag.h"
     8  
     9  // Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
    10  // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
    11  // Use a local trampoline, to avoid taking the address of a dynamically exported
    12  // function.
    13  TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
    14  	MOVV	_crosscall2_ptr(SB), R5
    15  	MOVV	$crosscall2_trampoline<>(SB), R6
    16  	MOVV	R6, (R5)
    17  	RET
    18  
    19  TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0
    20  	JMP	crosscall2(SB)
    21  
    22  // Called by C code generated by cmd/cgo.
    23  // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
    24  // Saves C callee-saved registers and calls cgocallback with three arguments.
    25  // fn is the PC of a func(a unsafe.Pointer) function.
    26  TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
    27  	/*
    28  	 * We still need to save all callee save register as before, and then
    29  	 *  push 3 args for fn (R4, R5, R7), skipping R6.
    30  	 * Also note that at procedure entry in gc world, 8(R29) will be the
    31  	 *  first arg.
    32  	 */
    33  #ifndef GOMIPS64_softfloat
    34  	ADDV	$(-8*23), R29
    35  #else
    36  	ADDV	$(-8*15), R29
    37  #endif
    38  	MOVV	R4, (8*1)(R29) // fn unsafe.Pointer
    39  	MOVV	R5, (8*2)(R29) // a unsafe.Pointer
    40  	MOVV	R7, (8*3)(R29) // ctxt uintptr
    41  	MOVV	R16, (8*4)(R29)
    42  	MOVV	R17, (8*5)(R29)
    43  	MOVV	R18, (8*6)(R29)
    44  	MOVV	R19, (8*7)(R29)
    45  	MOVV	R20, (8*8)(R29)
    46  	MOVV	R21, (8*9)(R29)
    47  	MOVV	R22, (8*10)(R29)
    48  	MOVV	R23, (8*11)(R29)
    49  	MOVV	RSB, (8*12)(R29)
    50  	MOVV	g, (8*13)(R29)
    51  	MOVV	R31, (8*14)(R29)
    52  #ifndef GOMIPS64_softfloat
    53  	MOVD	F24, (8*15)(R29)
    54  	MOVD	F25, (8*16)(R29)
    55  	MOVD	F26, (8*17)(R29)
    56  	MOVD	F27, (8*18)(R29)
    57  	MOVD	F28, (8*19)(R29)
    58  	MOVD	F29, (8*20)(R29)
    59  	MOVD	F30, (8*21)(R29)
    60  	MOVD	F31, (8*22)(R29)
    61  #endif
    62  	// Initialize Go ABI environment
    63  	// prepare SB register = PC & 0xffffffff00000000
    64  	BGEZAL	R0, 1(PC)
    65  	SRLV	$32, R31, RSB
    66  	SLLV	$32, RSB
    67  	JAL	runtime·load_g(SB)
    68  
    69  	JAL	runtime·cgocallback(SB)
    70  
    71  	MOVV	(8*4)(R29), R16
    72  	MOVV	(8*5)(R29), R17
    73  	MOVV	(8*6)(R29), R18
    74  	MOVV	(8*7)(R29), R19
    75  	MOVV	(8*8)(R29), R20
    76  	MOVV	(8*9)(R29), R21
    77  	MOVV	(8*10)(R29), R22
    78  	MOVV	(8*11)(R29), R23
    79  	MOVV	(8*12)(R29), RSB
    80  	MOVV	(8*13)(R29), g
    81  	MOVV	(8*14)(R29), R31
    82  #ifndef GOMIPS64_softfloat
    83  	MOVD	(8*15)(R29), F24
    84  	MOVD	(8*16)(R29), F25
    85  	MOVD	(8*17)(R29), F26
    86  	MOVD	(8*18)(R29), F27
    87  	MOVD	(8*19)(R29), F28
    88  	MOVD	(8*20)(R29), F29
    89  	MOVD	(8*21)(R29), F30
    90  	MOVD	(8*22)(R29), F31
    91  	ADDV	$(8*23), R29
    92  #else
    93  	ADDV	$(8*15), R29
    94  #endif
    95  	RET