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Diffstat (limited to 'src/runtime/cgo/asm_amd64.s')
| -rw-r--r-- | src/runtime/cgo/asm_amd64.s | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/runtime/cgo/asm_amd64.s b/src/runtime/cgo/asm_amd64.s new file mode 100644 index 0000000..386299c --- /dev/null +++ b/src/runtime/cgo/asm_amd64.s @@ -0,0 +1,34 @@ +// 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 |