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- // Copyright 2009 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"
- #include "abi_amd64.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.
- // This signature is known to SWIG, so we can't change it.
- TEXT crosscall2(SB), NOSPLIT, $0-0
- PUSH_REGS_HOST_TO_ABI0()
- // Make room for arguments to cgocallback.
- ADJSP $0x18
- #ifndef GOOS_windows
- MOVQ DI, 0x0(SP) // fn
- MOVQ SI, 0x8(SP) // arg
- // Skip n in DX.
- MOVQ CX, 0x10(SP) // ctxt
- #else
- MOVQ CX, 0x0(SP) // fn
- MOVQ DX, 0x8(SP) // arg
- // Skip n in R8.
- MOVQ R9, 0x10(SP) // ctxt
- #endif
- CALL runtime·cgocallback(SB)
- ADJSP $-0x18
- POP_REGS_HOST_TO_ABI0()
- RET
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