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// Copyright 2022 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"
// 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
/*
* We still need to save all callee save register as before, and then
* push 3 args for fn (R4, R5, R7), skipping R6.
* Also note that at procedure entry in gc world, 8(R29) will be the
* first arg.
*/
ADDV $(-8*22), R3
MOVV R4, (8*1)(R3) // fn unsafe.Pointer
MOVV R5, (8*2)(R3) // a unsafe.Pointer
MOVV R7, (8*3)(R3) // ctxt uintptr
MOVV R23, (8*4)(R3)
MOVV R24, (8*5)(R3)
MOVV R25, (8*6)(R3)
MOVV R26, (8*7)(R3)
MOVV R27, (8*8)(R3)
MOVV R28, (8*9)(R3)
MOVV R29, (8*10)(R3)
MOVV R30, (8*11)(R3)
MOVV g, (8*12)(R3)
MOVV R1, (8*13)(R3)
MOVD F24, (8*14)(R3)
MOVD F25, (8*15)(R3)
MOVD F26, (8*16)(R3)
MOVD F27, (8*17)(R3)
MOVD F28, (8*18)(R3)
MOVD F29, (8*19)(R3)
MOVD F30, (8*20)(R3)
MOVD F31, (8*21)(R3)
// Initialize Go ABI environment
JAL runtime·load_g(SB)
JAL runtime·cgocallback(SB)
MOVV (8*4)(R3), R23
MOVV (8*5)(R3), R24
MOVV (8*6)(R3), R25
MOVV (8*7)(R3), R26
MOVV (8*8)(R3), R27
MOVV (8*9)(R3), R28
MOVV (8*10)(R3), R29
MOVV (8*11)(R3), R30
MOVV (8*12)(R3), g
MOVV (8*13)(R3), R1
MOVD (8*14)(R3), F24
MOVD (8*15)(R3), F25
MOVD (8*16)(R3), F26
MOVD (8*17)(R3), F27
MOVD (8*18)(R3), F28
MOVD (8*19)(R3), F29
MOVD (8*20)(R3), F30
MOVD (8*21)(R3), F31
ADDV $(8*22), R3
RET
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