1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 .file "gcc_amd64.S"
6
7 /*
8 * Apple still insists on underscore prefixes for C function names.
9 */
10 #if defined(__APPLE__)
11 #define EXT(s) _##s
12 #else
13 #define EXT(s) s
14 #endif
15
16 /*
17 * void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g)
18 *
19 * Calling into the gc tool chain, where all registers are caller save.
20 * Called from standard x86-64 ABI, where %rbx, %rbp, %r12-%r15
21 * are callee-save so they must be saved explicitly.
22 * The standard x86-64 ABI passes the three arguments m, g, fn
23 * in %rdi, %rsi, %rdx.
24 */
25 .globl EXT(crosscall1)
26 EXT(crosscall1):
27 pushq %rbx
28 pushq %rbp
29 pushq %r12
30 pushq %r13
31 pushq %r14
32 pushq %r15
33
34 #if defined(_WIN64)
35 movq %r8, %rdi /* arg of setg_gcc */
36 call *%rdx /* setg_gcc */
37 call *%rcx /* fn */
38 #else
39 movq %rdi, %rbx
40 movq %rdx, %rdi /* arg of setg_gcc */
41 call *%rsi /* setg_gcc */
42 call *%rbx /* fn */
43 #endif
44
45 popq %r15
46 popq %r14
47 popq %r13
48 popq %r12
49 popq %rbp
50 popq %rbx
51 ret
52
53 #ifdef __ELF__
54 .section .note.GNU-stack,"",@progbits
55 #endif
56
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