// 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.

.file "gcc_amd64.S"

/*

* Apple still insists on underscore prefixes for C function names.

*/

#if defined(__APPLE__)

#define EXT(s) _##s

#else

#define EXT(s) s

#endif

/*

* void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g)

*

* Calling into the gc tool chain, where all registers are caller save.

* Called from standard x86-64 ABI, where %rbx, %rbp, %r12-%r15

* are callee-save so they must be saved explicitly.

* The standard x86-64 ABI passes the three arguments m, g, fn

* in %rdi, %rsi, %rdx.

*/

.globl EXT(crosscall1)

EXT(crosscall1):

pushq %rbx

pushq %rbp

pushq %r12

pushq %r13

pushq %r14

pushq %r15

#if defined(_WIN64)

movq %r8, %rdi /* arg of setg_gcc */

call *%rdx /* setg_gcc */

call *%rcx /* fn */

#else

movq %rdi, %rbx

movq %rdx, %rdi /* arg of setg_gcc */

call *%rsi /* setg_gcc */

call *%rbx /* fn */

#endif

popq %r15

popq %r14

popq %r13

popq %r12

popq %rbp

popq %rbx

ret

#ifdef __ELF__

.section .note.GNU-stack,"",@progbits

#endif