github.com/ice-blockchain/go/src@v0.0.0-20240403114104-1564d284e521/runtime/cgo/asm_riscv64.s (about)

     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  // Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
     8  // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
     9  // Use a local trampoline, to avoid taking the address of a dynamically exported
    10  // function.
    11  TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
    12  	MOV	_crosscall2_ptr(SB), X7
    13  	MOV	$crosscall2_trampoline<>(SB), X8
    14  	MOV	X8, (X7)
    15  	RET
    16  
    17  TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0
    18  	JMP	crosscall2(SB)
    19  
    20  // Called by C code generated by cmd/cgo.
    21  // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
    22  // Saves C callee-saved registers and calls cgocallback with three arguments.
    23  // fn is the PC of a func(a unsafe.Pointer) function.
    24  TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
    25  	/*
    26  	 * Push arguments for fn (X10, X11, X13), along with all callee-save
    27  	 * registers. Note that at procedure entry the first argument is at
    28  	 * 8(X2).
    29  	 */
    30  	ADD	$(-8*29), X2
    31  	MOV	X10, (8*1)(X2) // fn unsafe.Pointer
    32  	MOV	X11, (8*2)(X2) // a unsafe.Pointer
    33  	MOV	X13, (8*3)(X2) // ctxt uintptr
    34  	MOV	X8, (8*4)(X2)
    35  	MOV	X9, (8*5)(X2)
    36  	MOV	X18, (8*6)(X2)
    37  	MOV	X19, (8*7)(X2)
    38  	MOV	X20, (8*8)(X2)
    39  	MOV	X21, (8*9)(X2)
    40  	MOV	X22, (8*10)(X2)
    41  	MOV	X23, (8*11)(X2)
    42  	MOV	X24, (8*12)(X2)
    43  	MOV	X25, (8*13)(X2)
    44  	MOV	X26, (8*14)(X2)
    45  	MOV	g, (8*15)(X2)
    46  	MOV	X1, (8*16)(X2)
    47  	MOVD	F8, (8*17)(X2)
    48  	MOVD	F9, (8*18)(X2)
    49  	MOVD	F18, (8*19)(X2)
    50  	MOVD	F19, (8*20)(X2)
    51  	MOVD	F20, (8*21)(X2)
    52  	MOVD	F21, (8*22)(X2)
    53  	MOVD	F22, (8*23)(X2)
    54  	MOVD	F23, (8*24)(X2)
    55  	MOVD	F24, (8*25)(X2)
    56  	MOVD	F25, (8*26)(X2)
    57  	MOVD	F26, (8*27)(X2)
    58  	MOVD	F27, (8*28)(X2)
    59  
    60  	// Initialize Go ABI environment
    61  	CALL	runtime·load_g(SB)
    62  	CALL	runtime·cgocallback(SB)
    63  
    64  	MOV	(8*4)(X2), X8
    65  	MOV	(8*5)(X2), X9
    66  	MOV	(8*6)(X2), X18
    67  	MOV	(8*7)(X2), X19
    68  	MOV	(8*8)(X2), X20
    69  	MOV	(8*9)(X2), X21
    70  	MOV	(8*10)(X2), X22
    71  	MOV	(8*11)(X2), X23
    72  	MOV	(8*12)(X2), X24
    73  	MOV	(8*13)(X2), X25
    74  	MOV	(8*14)(X2), X26
    75  	MOV	(8*15)(X2), g
    76  	MOV	(8*16)(X2), X1
    77  	MOVD	(8*17)(X2), F8
    78  	MOVD	(8*18)(X2), F9
    79  	MOVD	(8*19)(X2), F18
    80  	MOVD	(8*20)(X2), F19
    81  	MOVD	(8*21)(X2), F20
    82  	MOVD	(8*22)(X2), F21
    83  	MOVD	(8*23)(X2), F22
    84  	MOVD	(8*24)(X2), F23
    85  	MOVD	(8*25)(X2), F24
    86  	MOVD	(8*26)(X2), F25
    87  	MOVD	(8*27)(X2), F26
    88  	MOVD	(8*28)(X2), F27
    89  	ADD	$(8*29), X2
    90  
    91  	RET