2009-10-03 11:37:12 -06:00
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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* Apple still insists on underscore prefixes for C function names.
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*/
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2010-04-06 00:44:05 -06:00
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#if defined(__APPLE__) || defined(__MINGW64__)
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2009-10-03 11:37:12 -06:00
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#define EXT(s) _##s
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#else
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#define EXT(s) s
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#endif
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/*
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* void crosscall_amd64(M *m, G *g, void (*fn)(void))
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*
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* Calling into the 6c tool chain, where all registers are caller save.
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* Called from standard x86-64 ABI, where %rbx, %rbp, %r12-%r15
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* are callee-save so they must be saved explicitly.
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* The standard x86-64 ABI passes the three arguments m, g, fn
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* in %rdi, %rsi, %rdx.
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*
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* Also need to set %r15 to g and %r14 to m (see ../pkg/runtime/mkasmh.sh)
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* during the call.
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*/
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.globl EXT(crosscall_amd64)
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EXT(crosscall_amd64):
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pushq %rbx
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pushq %rbp
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pushq %r12
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pushq %r13
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pushq %r14
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pushq %r15
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movq %rdi, %r14 /* m */
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movq %rsi, %r15 /* g */
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call *%rdx /* fn */
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popq %r15
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popq %r14
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popq %r13
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popq %r12
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popq %rbp
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popq %rbx
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ret
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