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Diffstat (limited to 'src/runtime/cgo/gcc_amd64.S')
| -rw-r--r-- | src/runtime/cgo/gcc_amd64.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_amd64.S b/src/runtime/cgo/gcc_amd64.S new file mode 100644 index 0000000..5a1629e --- /dev/null +++ b/src/runtime/cgo/gcc_amd64.S @@ -0,0 +1,55 @@ +// 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 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 |