github.com/maenmax/kairep@v0.0.0-20210218001208-55bf3df36788/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  }