libc/sysdeps/linux/metag/bits/syscalls.h

   1 /*
   2  * Copyright (C) 2013 Imagination Technologies Ltd.
   3  *
   4  * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
   5  *
   6  */
   7
   8 #ifndef _BITS_SYSCALLS_H
   9 #define _BITS_SYSCALLS_H
  10 #ifndef _SYSCALL_H
  11 # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
  12 #endif
  13
  14 /*
  15   Meta version adapted from the ARM version.
  16 */
  17
  18 #define SYS_ify(syscall_name)  (__NR_##syscall_name)
  19
  20 #ifdef __ASSEMBLER__
  21
  22 /* Call a given syscall, with arguments loaded. */
  23 #undef DO_CALL
  24 #define DO_CALL(syscall_name, args)             \
  25   MOV D1Re0, #SYS_ify (syscall_name);           \
  26   SWITCH #0x440001
  27
  28 #else
  29
  30 #include <errno.h>
  31
  32 #undef INLINE_SYSCALL_NCS
  33 #define INLINE_SYSCALL_NCS(name, nr, args...)                           \
  34 (__extension__                                                          \
  35   ({ unsigned int _inline_sys_result = INTERNAL_SYSCALL_NCS (name, , nr, args); \
  36     if (unlikely(INTERNAL_SYSCALL_ERROR_P (_inline_sys_result, )))      \
  37       {                                                                 \
  38         __set_errno (INTERNAL_SYSCALL_ERRNO (_inline_sys_result, ));    \
  39         _inline_sys_result = (unsigned int) -1;                         \
  40       }                                                                 \
  41     (int) _inline_sys_result; })                                        \
  42 )
  43
  44 #undef INTERNAL_SYSCALL_DECL
  45 #define INTERNAL_SYSCALL_DECL(err) do { } while (0)
  46
  47 #undef INTERNAL_SYSCALL_NCS
  48 #define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                    \
  49 (__extension__                                                          \
  50   ({unsigned int __sys_result;                                          \
  51     {                                                                   \
  52       register int _result __asm__ ("D0Re0"), _nr __asm__ ("D1Re0");    \
  53       LOAD_ARGS_##nr (args);                                            \
  54       _nr = (name);                                                     \
  55       __asm__ volatile ("SWITCH  #0x440001 ! syscall " #name            \
  56                         : "=r" (_result)                                \
  57                         : "d" (_nr) ASM_ARGS_##nr                       \
  58                         : "memory");                                    \
  59       __sys_result = _result;                                           \
  60     }                                                                   \
  61     (int) __sys_result; })                                              \
  62 )
  63
  64 #undef INTERNAL_SYSCALL_ERROR_P
  65 #define INTERNAL_SYSCALL_ERROR_P(val, err) \
  66   ((unsigned int) (val) >= 0xfffff001u)
  67
  68 #undef INTERNAL_SYSCALL_ERRNO
  69 #define INTERNAL_SYSCALL_ERRNO(val, err)        (-(val))
  70
  71 #define LOAD_ARGS_0()
  72 #define ASM_ARGS_0
  73 #define LOAD_ARGS_1(a1)                                 \
  74   register int _a1 __asm__ ("D1Ar1") = (int) (a1);      \
  75   LOAD_ARGS_0 ()
  76 #define ASM_ARGS_1      ASM_ARGS_0, "d" (_a1)
  77 #define LOAD_ARGS_2(a1, a2)                             \
  78   register int _a2 __asm__ ("D0Ar2") = (int) (a2);      \
  79   LOAD_ARGS_1 (a1)
  80 #define ASM_ARGS_2      ASM_ARGS_1, "d" (_a2)
  81 #define LOAD_ARGS_3(a1, a2, a3)                         \
  82   register int _a3 __asm__ ("D1Ar3") = (int) (a3);      \
  83   LOAD_ARGS_2 (a1, a2)
  84 #define ASM_ARGS_3      ASM_ARGS_2, "d" (_a3)
  85 #define LOAD_ARGS_4(a1, a2, a3, a4)                     \
  86   register int _a4 __asm__ ("D0Ar4") = (int) (a4);      \
  87   LOAD_ARGS_3 (a1, a2, a3)
  88 #define ASM_ARGS_4      ASM_ARGS_3, "d" (_a4)
  89 #define LOAD_ARGS_5(a1, a2, a3, a4, a5)                 \
  90   register int _a5 __asm__ ("D1Ar5") = (int) (a5);      \
  91   LOAD_ARGS_4 (a1, a2, a3, a4)
  92 #define ASM_ARGS_5      ASM_ARGS_4, "d" (_a5)
  93 #define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6)             \
  94   register int _a6 __asm__ ("D0Ar6") = (int) (a6);      \
  95   LOAD_ARGS_5 (a1, a2, a3, a4, a5)
  96 #define ASM_ARGS_6      ASM_ARGS_5, "d" (_a6)
  97
  98 #endif /* __ASSEMBLER__ */
  99 #endif /* _BITS_SYSCALLS_H */