github.com/geraldss/go/src@v0.0.0-20210511222824-ac7d0ebfc235/runtime/cgo/asm_amd64.s (about)

     1  // Copyright 2009 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  // Called by C code generated by cmd/cgo.
     8  // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
     9  // Saves C callee-saved registers and calls cgocallback with three arguments.
    10  // fn is the PC of a func(a unsafe.Pointer) function.
    11  // This signature is known to SWIG, so we can't change it.
    12  #ifndef GOOS_windows
    13  TEXT crosscall2(SB),NOSPLIT,$0x50-0 /* keeps stack pointer 32-byte aligned */
    14  #else
    15  TEXT crosscall2(SB),NOSPLIT,$0x110-0 /* also need to save xmm6 - xmm15 */
    16  #endif
    17  	MOVQ	BX, 0x18(SP)
    18  	MOVQ	R12, 0x28(SP)
    19  	MOVQ	R13, 0x30(SP)
    20  	MOVQ	R14, 0x38(SP)
    21  	MOVQ	R15, 0x40(SP)
    22  
    23  #ifdef GOOS_windows
    24  	// Win64 save RBX, RBP, RDI, RSI, RSP, R12, R13, R14, R15 and XMM6 -- XMM15.
    25  	MOVQ	DI, 0x48(SP)
    26  	MOVQ	SI, 0x50(SP)
    27  	MOVUPS	X6, 0x60(SP)
    28  	MOVUPS	X7, 0x70(SP)
    29  	MOVUPS	X8, 0x80(SP)
    30  	MOVUPS	X9, 0x90(SP)
    31  	MOVUPS	X10, 0xa0(SP)
    32  	MOVUPS	X11, 0xb0(SP)
    33  	MOVUPS	X12, 0xc0(SP)
    34  	MOVUPS	X13, 0xd0(SP)
    35  	MOVUPS	X14, 0xe0(SP)
    36  	MOVUPS	X15, 0xf0(SP)
    37  
    38  	MOVQ	CX, 0x0(SP)	/* fn */
    39  	MOVQ	DX, 0x8(SP)	/* arg */
    40  	// Skip n in R8.
    41  	MOVQ	R9, 0x10(SP)	/* ctxt */
    42  
    43  	CALL	runtime·cgocallback(SB)
    44  
    45  	MOVQ	0x48(SP), DI
    46  	MOVQ	0x50(SP), SI
    47  	MOVUPS	0x60(SP), X6
    48  	MOVUPS	0x70(SP), X7
    49  	MOVUPS	0x80(SP), X8
    50  	MOVUPS	0x90(SP), X9
    51  	MOVUPS	0xa0(SP), X10
    52  	MOVUPS	0xb0(SP), X11
    53  	MOVUPS	0xc0(SP), X12
    54  	MOVUPS	0xd0(SP), X13
    55  	MOVUPS	0xe0(SP), X14
    56  	MOVUPS	0xf0(SP), X15
    57  #else
    58  	MOVQ	DI, 0x0(SP)	/* fn */
    59  	MOVQ	SI, 0x8(SP)	/* arg */
    60  	// Skip n in DX.
    61  	MOVQ	CX, 0x10(SP)	/* ctxt */
    62  
    63  	CALL	runtime·cgocallback(SB)
    64  #endif
    65  
    66  	MOVQ	0x18(SP), BX
    67  	MOVQ	0x28(SP), R12
    68  	MOVQ	0x30(SP), R13
    69  	MOVQ	0x38(SP), R14
    70  	MOVQ	0x40(SP), R15
    71  
    72  	RET