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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "textflag.h"
// Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
// It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2
// Use a local trampoline, to avoid taking the address of a dynamically exported
// function.
TEXT ·set_crosscall2(SB),NOSPLIT,$0-0
MOV _crosscall2_ptr(SB), X7
MOV $crosscall2_trampoline<>(SB), X8
MOV X8, (X7)
RET
TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0
JMP crosscall2(SB)
// Called by C code generated by cmd/cgo.
// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
// Saves C callee-saved registers and calls cgocallback with three arguments.
// fn is the PC of a func(a unsafe.Pointer) function.
TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
/*
* Push arguments for fn (X10, X11, X13), along with all callee-save
* registers. Note that at procedure entry the first argument is at
* 8(X2).
*/
ADD $(-8*29), X2
MOV X10, (8*1)(X2) // fn unsafe.Pointer
MOV X11, (8*2)(X2) // a unsafe.Pointer
MOV X13, (8*3)(X2) // ctxt uintptr
MOV X8, (8*4)(X2)
MOV X9, (8*5)(X2)
MOV X18, (8*6)(X2)
MOV X19, (8*7)(X2)
MOV X20, (8*8)(X2)
MOV X21, (8*9)(X2)
MOV X22, (8*10)(X2)
MOV X23, (8*11)(X2)
MOV X24, (8*12)(X2)
MOV X25, (8*13)(X2)
MOV X26, (8*14)(X2)
MOV g, (8*15)(X2)
MOV X1, (8*16)(X2)
MOVD F8, (8*17)(X2)
MOVD F9, (8*18)(X2)
MOVD F18, (8*19)(X2)
MOVD F19, (8*20)(X2)
MOVD F20, (8*21)(X2)
MOVD F21, (8*22)(X2)
MOVD F22, (8*23)(X2)
MOVD F23, (8*24)(X2)
MOVD F24, (8*25)(X2)
MOVD F25, (8*26)(X2)
MOVD F26, (8*27)(X2)
MOVD F27, (8*28)(X2)
// Initialize Go ABI environment
CALL runtime·load_g(SB)
CALL runtime·cgocallback(SB)
MOV (8*4)(X2), X8
MOV (8*5)(X2), X9
MOV (8*6)(X2), X18
MOV (8*7)(X2), X19
MOV (8*8)(X2), X20
MOV (8*9)(X2), X21
MOV (8*10)(X2), X22
MOV (8*11)(X2), X23
MOV (8*12)(X2), X24
MOV (8*13)(X2), X25
MOV (8*14)(X2), X26
MOV (8*15)(X2), g
MOV (8*16)(X2), X1
MOVD (8*17)(X2), F8
MOVD (8*18)(X2), F9
MOVD (8*19)(X2), F18
MOVD (8*20)(X2), F19
MOVD (8*21)(X2), F20
MOVD (8*22)(X2), F21
MOVD (8*23)(X2), F22
MOVD (8*24)(X2), F23
MOVD (8*25)(X2), F24
MOVD (8*26)(X2), F25
MOVD (8*27)(X2), F26
MOVD (8*28)(X2), F27
ADD $(8*29), X2
RET
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