David K. Bainbridge | 215e024 | 2017-09-05 23:18:24 -0700 | [diff] [blame] | 1 | // Copyright 2015 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 | // +build gccgo |
| 6 | |
| 7 | #include <errno.h> |
| 8 | #include <stdint.h> |
| 9 | #include <unistd.h> |
| 10 | |
| 11 | #define _STRINGIFY2_(x) #x |
| 12 | #define _STRINGIFY_(x) _STRINGIFY2_(x) |
| 13 | #define GOSYM_PREFIX _STRINGIFY_(__USER_LABEL_PREFIX__) |
| 14 | |
| 15 | // Call syscall from C code because the gccgo support for calling from |
| 16 | // Go to C does not support varargs functions. |
| 17 | |
| 18 | struct ret { |
| 19 | uintptr_t r; |
| 20 | uintptr_t err; |
| 21 | }; |
| 22 | |
| 23 | struct ret |
| 24 | gccgoRealSyscall(uintptr_t trap, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7, uintptr_t a8, uintptr_t a9) |
| 25 | { |
| 26 | struct ret r; |
| 27 | |
| 28 | errno = 0; |
| 29 | r.r = syscall(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9); |
| 30 | r.err = errno; |
| 31 | return r; |
| 32 | } |
| 33 | |
| 34 | // Define the use function in C so that it is not inlined. |
| 35 | |
| 36 | extern void use(void *) __asm__ (GOSYM_PREFIX GOPKGPATH ".use") __attribute__((noinline)); |
| 37 | |
| 38 | void |
| 39 | use(void *p __attribute__ ((unused))) |
| 40 | { |
| 41 | } |