sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h

   1 /* Copyright (C) 1992,1997-2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _LINUX_POWERPC_SYSDEP_H
  20 #define _LINUX_POWERPC_SYSDEP_H 1
  21
  22 #include <sysdeps/unix/powerpc/sysdep.h>
  23
  24 /* Some systen calls got renamed over time, but retained the same semantics.
  25    Handle them here so they can be catched by both C and assembler stubs in
  26    glibc.  */
  27
  28 #ifdef __NR_pread64
  29 # ifdef __NR_pread
  30 #  error "__NR_pread and __NR_pread64 both defined???"
  31 # endif
  32 # define __NR_pread __NR_pread64
  33 #endif
  34
  35 #ifdef __NR_pwrite64
  36 # ifdef __NR_pwrite
  37 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  38 # endif
  39 # define __NR_pwrite __NR_pwrite64
  40 #endif
  41
  42 /* For Linux we can use the system call table in the header file
  43         /usr/include/asm/unistd.h
  44    of the kernel.  But these symbols do not follow the SYS_* syntax
  45    so we have to redefine the `SYS_ify' macro here.  */
  46 #undef SYS_ify
  47 #ifdef __STDC__
  48 # define SYS_ify(syscall_name)  __NR_##syscall_name
  49 #else
  50 # define SYS_ify(syscall_name)  __NR_/**/syscall_name
  51 #endif
  52
  53 #ifndef __ASSEMBLER__
  54
  55 # include <errno.h>
  56
  57 # undef INLINE_SYSCALL
  58 # define INLINE_SYSCALL(name, nr, args...)                              \
  59   ({                                                                    \
  60     INTERNAL_SYSCALL_DECL (sc_err);                                     \
  61     long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);        \
  62     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                      \
  63       {                                                                 \
  64         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));          \
  65         sc_ret = -1L;                                                   \
  66       }                                                                 \
  67     sc_ret;                                                             \
  68   })
  69
  70 /* Define a macro which expands inline into the wrapper code for a system
  71    call. This use is for internal calls that do not need to handle errors
  72    normally. It will never touch errno.
  73    On powerpc a system call basically clobbers the same registers like a
  74    function call, with the exception of LR (which is needed for the
  75    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
  76    an error return status).  */
  77
  78 # undef INTERNAL_SYSCALL_DECL
  79 # define INTERNAL_SYSCALL_DECL(err) long int err
  80
  81 # undef INTERNAL_SYSCALL
  82 # define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                   \
  83   ({                                                                    \
  84     register long int r0  __asm__ ("r0");                               \
  85     register long int r3  __asm__ ("r3");                               \
  86     register long int r4  __asm__ ("r4");                               \
  87     register long int r5  __asm__ ("r5");                               \
  88     register long int r6  __asm__ ("r6");                               \
  89     register long int r7  __asm__ ("r7");                               \
  90     register long int r8  __asm__ ("r8");                               \
  91     register long int r9  __asm__ ("r9");                               \
  92     register long int r10 __asm__ ("r10");                              \
  93     register long int r11 __asm__ ("r11");                              \
  94     register long int r12 __asm__ ("r12");                              \
  95     LOADARGS_##nr(name, args);                                          \
  96     __asm__ __volatile__                                                \
  97       ("sc   \n\t"                                                      \
  98        "mfcr %0"                                                        \
  99        : "=&r" (r0),                                                    \
 100          "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),  \
 101          "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)  \
 102        : ASM_INPUT_##nr                                                 \
 103        : "cr0", "ctr", "memory");                                       \
 104     err = r0;                                                           \
 105     (int) r3;                                                           \
 106   })
 107 # define INTERNAL_SYSCALL(name, err, nr, args...) \
 108   INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
 109
 110 # undef INTERNAL_SYSCALL_ERROR_P
 111 # define INTERNAL_SYSCALL_ERROR_P(val, err) \
 112   (__builtin_expect (err & (1 << 28), 0))
 113
 114 # undef INTERNAL_SYSCALL_ERRNO
 115 # define INTERNAL_SYSCALL_ERRNO(val, err)     (val)
 116
 117 # define LOADARGS_0(name, dummy) \
 118         r0 = name
 119 # define LOADARGS_1(name, __arg1) \
 120         long int arg1 = (long int) (__arg1);    \
 121         LOADARGS_0(name, 0); \
 122         extern void __illegally_sized_syscall_arg1 (void); \
 123         if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
 124           __illegally_sized_syscall_arg1 (); \
 125         r3 = arg1
 126 # define LOADARGS_2(name, __arg1, __arg2) \
 127         long int arg2 = (long int) (__arg2); \
 128         LOADARGS_1(name, __arg1); \
 129         extern void __illegally_sized_syscall_arg2 (void); \
 130         if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
 131           __illegally_sized_syscall_arg2 (); \
 132         r4 = arg2
 133 # define LOADARGS_3(name, __arg1, __arg2, __arg3) \
 134         long int arg3 = (long int) (__arg3); \
 135         LOADARGS_2(name, __arg1, __arg2); \
 136         extern void __illegally_sized_syscall_arg3 (void); \
 137         if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
 138           __illegally_sized_syscall_arg3 (); \
 139         r5 = arg3
 140 # define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
 141         long int arg4 = (long int) (__arg4); \
 142         LOADARGS_3(name, __arg1, __arg2, __arg3); \
 143         extern void __illegally_sized_syscall_arg4 (void); \
 144         if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \
 145           __illegally_sized_syscall_arg4 (); \
 146         r6 = arg4
 147 # define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
 148         long int arg5 = (long int) (__arg5); \
 149         LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
 150         extern void __illegally_sized_syscall_arg5 (void); \
 151         if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
 152           __illegally_sized_syscall_arg5 (); \
 153         r7 = arg5
 154 # define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
 155         long int arg6 = (long int) (__arg6); \
 156         LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
 157         extern void __illegally_sized_syscall_arg6 (void); \
 158         if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
 159           __illegally_sized_syscall_arg6 (); \
 160         r8 = arg6
 161
 162 # define ASM_INPUT_0 "0" (r0)
 163 # define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
 164 # define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
 165 # define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
 166 # define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
 167 # define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 168 # define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 169
 170 #endif /* __ASSEMBLER__ */
 171
 172
 173 #endif /* linux/powerpc/powerpc32/sysdep.h */