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  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. }
  42.  
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