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Diffstat (limited to 'src/runtime/cgo/gcc_386.S')
| -rw-r--r-- | src/runtime/cgo/gcc_386.S | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/runtime/cgo/gcc_386.S b/src/runtime/cgo/gcc_386.S new file mode 100644 index 0000000..d4c5934 --- /dev/null +++ b/src/runtime/cgo/gcc_386.S @@ -0,0 +1,48 @@ +// 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_386.S" + +/* + * Windows still insists on underscore prefixes for C function names. + */ +#if defined(_WIN32) +#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 ABI, where %ebp, %ebx, %esi, + * and %edi are callee-save, so they must be saved explicitly. + */ +.globl EXT(crosscall1) +EXT(crosscall1): + pushl %ebp + movl %esp, %ebp + pushl %ebx + pushl %esi + pushl %edi + + movl 16(%ebp), %eax /* g */ + pushl %eax + movl 12(%ebp), %eax /* setg_gcc */ + call *%eax + popl %eax + + movl 8(%ebp), %eax /* fn */ + call *%eax + + popl %edi + popl %esi + popl %ebx + popl %ebp + ret + +#ifdef __ELF__ +.section .note.GNU-stack,"",@progbits +#endif |