github.com/dolotech/hongbao@v0.0.0-20191130105438-fd59d7a5dda5/src/golang.org/x/sys/unix/gccgo_c.c (about) 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 }