sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h

   1 /* Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* Alan Modra <amodra@bigpond.net.au> rewrote the INLINE_SYSCALL macro */
  21
  22 #ifndef _LINUX_POWERPC_SYSDEP_H
  23 #define _LINUX_POWERPC_SYSDEP_H 1
  24
  25 #include <sysdeps/unix/powerpc/sysdep.h>
  26
  27 /* Define __set_errno() for INLINE_SYSCALL macro below.  */
  28 #ifndef __ASSEMBLER__
  29 #include <errno.h>
  30 #endif
  31
  32 /* Some systen calls got renamed over time, but retained the same semantics.
  33    Handle them here so they can be catched by both C and assembler stubs in
  34    glibc.  */
  35
  36 #ifdef __NR_pread64
  37 # ifdef __NR_pread
  38 #  error "__NR_pread and __NR_pread64 both defined???"
  39 # endif
  40 # define __NR_pread __NR_pread64
  41 #endif
  42
  43 #ifdef __NR_pwrite64
  44 # ifdef __NR_pwrite
  45 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  46 # endif
  47 # define __NR_pwrite __NR_pwrite64
  48 #endif
  49
  50 /* For Linux we can use the system call table in the header file
  51         /usr/include/asm/unistd.h
  52    of the kernel.  But these symbols do not follow the SYS_* syntax
  53    so we have to redefine the `SYS_ify' macro here.  */
  54 #undef SYS_ify
  55 #ifdef __STDC__
  56 # define SYS_ify(syscall_name)  __NR_##syscall_name
  57 #else
  58 # define SYS_ify(syscall_name)  __NR_/**/syscall_name
  59 #endif
  60
  61 #ifdef __ASSEMBLER__
  62
  63 /* This seems to always be the case on PPC.  */
  64 #define ALIGNARG(log2) log2
  65 /* For ELF we need the `.type' directive to make shared libs work right.  */
  66 #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
  67 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  68
  69 #endif  /* __ASSEMBLER__ */
  70
  71 #undef INLINE_SYSCALL
  72
  73 /* This version is for kernels that implement system calls that
  74    behave like function calls as far as register saving.  */
  75 #define INLINE_SYSCALL(name, nr, args...)                               \
  76   ({                                                                    \
  77     INTERNAL_SYSCALL_DECL (sc_err);                                     \
  78     long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);        \
  79     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                      \
  80       {                                                                 \
  81         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));          \
  82         sc_ret = -1L;                                                   \
  83       }                                                                 \
  84     sc_ret;                                                             \
  85   })
  86
  87 /* Define a macro which expands inline into the wrapper code for a system
  88    call. This use is for internal calls that do not need to handle errors
  89    normally. It will never touch errno. This returns just what the kernel
  90    gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
  91    the negation of the return value in the kernel gets reverted.  */
  92
  93 #undef INTERNAL_SYSCALL
  94 #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
  95   ({                                                                    \
  96     register long int r0  __asm__ ("r0");                               \
  97     register long int r3  __asm__ ("r3");                               \
  98     register long int r4  __asm__ ("r4");                               \
  99     register long int r5  __asm__ ("r5");                               \
 100     register long int r6  __asm__ ("r6");                               \
 101     register long int r7  __asm__ ("r7");                               \
 102     register long int r8  __asm__ ("r8");                               \
 103     LOADARGS_##nr(name, args);                                          \
 104     __asm__ __volatile__                                                \
 105       ("sc\n\t"                                                         \
 106        "mfcr  %0\n\t"                                                   \
 107        "0:"                                                             \
 108        : "=&r" (r0),                                                    \
 109          "=&r" (r3), "=&r" (r4), "=&r" (r5),                            \
 110          "=&r" (r6), "=&r" (r7), "=&r" (r8)                             \
 111        : ASM_INPUT_##nr                                                 \
 112        : "r9", "r10", "r11", "r12",                                     \
 113          "cr0", "ctr", "memory");                                       \
 114           err = r0;  \
 115     (int) r3;  \
 116   })
 117 #define INTERNAL_SYSCALL(name, err, nr, args...)                        \
 118   INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
 119
 120 #undef INTERNAL_SYSCALL_DECL
 121 #define INTERNAL_SYSCALL_DECL(err) long int err
 122
 123 #undef INTERNAL_SYSCALL_ERROR_P
 124 #define INTERNAL_SYSCALL_ERROR_P(val, err) \
 125   (__builtin_expect (err & (1 << 28), 0))
 126
 127 #undef INTERNAL_SYSCALL_ERRNO
 128 #define INTERNAL_SYSCALL_ERRNO(val, err)     (val)
 129
 130 #define LOADARGS_0(name, dummy) \
 131         r0 = name
 132 #define LOADARGS_1(name, __arg1) \
 133         long int arg1 = (long int) (__arg1); \
 134         LOADARGS_0(name, 0); \
 135         extern void __illegally_sized_syscall_arg1 (void); \
 136         if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 8) \
 137           __illegally_sized_syscall_arg1 (); \
 138         r3 = arg1
 139 #define LOADARGS_2(name, __arg1, __arg2) \
 140         long int arg2 = (long int) (__arg2); \
 141         LOADARGS_1(name, __arg1); \
 142         extern void __illegally_sized_syscall_arg2 (void); \
 143         if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 8) \
 144           __illegally_sized_syscall_arg2 (); \
 145         r4 = arg2
 146 #define LOADARGS_3(name, __arg1, __arg2, __arg3) \
 147         long int arg3 = (long int) (__arg3); \
 148         LOADARGS_2(name, __arg1, __arg2); \
 149         extern void __illegally_sized_syscall_arg3 (void); \
 150         if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 8) \
 151           __illegally_sized_syscall_arg3 (); \
 152         r5 = arg3
 153 #define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
 154         long int arg4 = (long int) (__arg4); \
 155         LOADARGS_3(name, __arg1, __arg2, __arg3); \
 156         extern void __illegally_sized_syscall_arg4 (void); \
 157         if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 8) \
 158           __illegally_sized_syscall_arg4 (); \
 159         r6 = arg4
 160 #define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
 161         long int arg5 = (long int) (__arg5); \
 162         LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
 163         extern void __illegally_sized_syscall_arg5 (void); \
 164         if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 8) \
 165           __illegally_sized_syscall_arg5 (); \
 166         r7 = arg5
 167 #define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
 168         long int arg6 = (long int) (__arg6); \
 169         LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
 170         extern void __illegally_sized_syscall_arg6 (void); \
 171         if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 8) \
 172           __illegally_sized_syscall_arg6 (); \
 173         r8 = arg6
 174
 175 #define ASM_INPUT_0 "0" (r0)
 176 #define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
 177 #define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
 178 #define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
 179 #define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
 180 #define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 181 #define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 182
 183 #endif /* linux/powerpc/powerpc64/sysdep.h */