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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.
/*
* Apple still insists on underscore prefixes for C function names.
*/
#if defined(__APPLE__)
#define EXT(s) _##s
#else
#define EXT(s) s
#endif
/*
* void crosscall_amd64(void (*fn)(void), void (*setg_gcc)(void*), void *g)
*
* Calling into the 6c 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(crosscall_amd64)
EXT(crosscall_amd64):
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
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