| // 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. |
| */ |
| #ifdef __APPLE__ |
| #define EXT(s) _##s |
| #else |
| #define EXT(s) s |
| #endif |
| |
| /* |
| * void crosscall_amd64(M *m, G *g, void (*fn)(void)) |
| * |
| * 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. |
| * |
| * Also need to set %r15 to g and %r14 to m (see ../pkg/runtime/mkasmh.sh) |
| * during the call. |
| */ |
| .globl EXT(crosscall_amd64) |
| EXT(crosscall_amd64): |
| pushq %rbx |
| pushq %rbp |
| pushq %r12 |
| pushq %r13 |
| pushq %r14 |
| pushq %r15 |
| |
| movq %rdi, %r14 /* m */ |
| movq %rsi, %r15 /* g */ |
| call *%rdx /* fn */ |
| |
| popq %r15 |
| popq %r14 |
| popq %r13 |
| popq %r12 |
| popq %rbp |
| popq %rbx |
| ret |
