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

   1 /* Copyright (C) 1992,1997-2003,2004,2005,2006 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 #include <tls.h>
  24
  25 /* Some systen calls got renamed over time, but retained the same semantics.
  26    Handle them here so they can be catched by both C and assembler stubs in
  27    glibc.  */
  28
  29 #ifdef __NR_pread64
  30 # ifdef __NR_pread
  31 #  error "__NR_pread and __NR_pread64 both defined???"
  32 # endif
  33 # define __NR_pread __NR_pread64
  34 #endif
  35
  36 #ifdef __NR_pwrite64
  37 # ifdef __NR_pwrite
  38 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  39 # endif
  40 # define __NR_pwrite __NR_pwrite64
  41 #endif
  42
  43 /* For Linux we can use the system call table in the header file
  44         /usr/include/asm/unistd.h
  45    of the kernel.  But these symbols do not follow the SYS_* syntax
  46    so we have to redefine the `SYS_ify' macro here.  */
  47 #undef SYS_ify
  48 #ifdef __STDC__
  49 # define SYS_ify(syscall_name)  __NR_##syscall_name
  50 #else
  51 # define SYS_ify(syscall_name)  __NR_/**/syscall_name
  52 #endif
  53
  54 #ifndef __ASSEMBLER__
  55
  56 # include <errno.h>
  57
  58 # ifdef SHARED
  59 #  define INLINE_VSYSCALL(name, nr, args...) \
  60   ({                                                                          \
  61     __label__ out;                                                            \
  62     __label__ iserr;                                                          \
  63     INTERNAL_SYSCALL_DECL (sc_err);                                           \
  64     long int sc_ret;                                                          \
  65                                                                               \
  66     if (__vdso_##name != NULL)                                                \
  67       {                                                                       \
  68         sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, nr, ##args);   \
  69         if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                       \
  70           goto out;                                                           \
  71         if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS)                \
  72           goto iserr;                                                         \
  73       }                                                                       \
  74                                                                               \
  75     sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args);                     \
  76     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                            \
  77       {                                                                       \
  78       iserr:                                                                  \
  79         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));                \
  80         sc_ret = -1L;                                                         \
  81       }                                                                       \
  82   out:                                                                        \
  83     sc_ret;                                                                   \
  84   })
  85 # else
  86 #  define INLINE_VSYSCALL(name, nr, args...) \
  87   INLINE_SYSCALL (name, nr, ##args)
  88 # endif
  89
  90 # ifdef SHARED
  91 #  define INTERNAL_VSYSCALL(name, err, nr, args...) \
  92   ({                                                                          \
  93     __label__ out;                                                            \
  94     long int v_ret;                                                           \
  95                                                                               \
  96     if (__vdso_##name != NULL)                                                \
  97       {                                                                       \
  98         v_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);       \
  99         if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err)                            \
 100             || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS)                 \
 101           goto out;                                                           \
 102       }                                                                       \
 103     v_ret = INTERNAL_SYSCALL (name, err, nr, ##args);                         \
 104   out:                                                                        \
 105     v_ret;                                                                    \
 106   })
 107 # else
 108 #  define INTERNAL_VSYSCALL(name, err, nr, args...) \
 109   INTERNAL_SYSCALL (name, err, nr, ##args)
 110 # endif
 111
 112 # define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, nr, args...)        \
 113   ({                                                                          \
 114     long int sc_ret = ENOSYS;                                                 \
 115                                                                               \
 116     if (__vdso_##name != NULL)                                                \
 117       sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, nr, ##args);        \
 118     else                                                                      \
 119       err = 1 << 28;                                                          \
 120     sc_ret;                                                                   \
 121   })
 122
 123 /* List of system calls which are supported as vsyscalls.  */
 124 # define HAVE_CLOCK_GETRES_VSYSCALL     1
 125 # define HAVE_CLOCK_GETTIME_VSYSCALL    1
 126
 127 /* Define a macro which expands inline into the wrapper code for a VDSO
 128    call. This use is for internal calls that do not need to handle errors
 129    normally. It will never touch errno.
 130    On powerpc a system call basically clobbers the same registers like a
 131    function call, with the exception of LR (which is needed for the
 132    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
 133    an error return status).  */
 134 # define INTERNAL_VSYSCALL_NCS(funcptr, err, nr, args...) \
 135   ({                                                                          \
 136     register void *r0  __asm__ ("r0");                                        \
 137     register long int r3  __asm__ ("r3");                                     \
 138     register long int r4  __asm__ ("r4");                                     \
 139     register long int r5  __asm__ ("r5");                                     \
 140     register long int r6  __asm__ ("r6");                                     \
 141     register long int r7  __asm__ ("r7");                                     \
 142     register long int r8  __asm__ ("r8");                                     \
 143     register long int r9  __asm__ ("r9");                                     \
 144     register long int r10 __asm__ ("r10");                                    \
 145     register long int r11 __asm__ ("r11");                                    \
 146     register long int r12 __asm__ ("r12");                                    \
 147     LOADARGS_##nr (funcptr, args);                                            \
 148     __asm__ __volatile__                                                      \
 149       ("mtctr %0\n\t"                                                         \
 150        "bctrl\n\t"                                                            \
 151        "mfcr %0"                                                              \
 152        : "=&r" (r0),                                                          \
 153          "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),        \
 154          "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)        \
 155        : ASM_INPUT_##nr                                                       \
 156        : "cr0", "ctr", "lr", "memory");                                       \
 157     err = (long int) r0;                                                      \
 158     (int) r3;                                                                 \
 159   })
 160
 161 # undef INLINE_SYSCALL
 162 # define INLINE_SYSCALL(name, nr, args...)                              \
 163   ({                                                                    \
 164     INTERNAL_SYSCALL_DECL (sc_err);                                     \
 165     long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);        \
 166     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                      \
 167       {                                                                 \
 168         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));          \
 169         sc_ret = -1L;                                                   \
 170       }                                                                 \
 171     sc_ret;                                                             \
 172   })
 173
 174 /* Define a macro which expands inline into the wrapper code for a system
 175    call. This use is for internal calls that do not need to handle errors
 176    normally. It will never touch errno.
 177    On powerpc a system call basically clobbers the same registers like a
 178    function call, with the exception of LR (which is needed for the
 179    "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
 180    an error return status).  */
 181
 182 # undef INTERNAL_SYSCALL_DECL
 183 # define INTERNAL_SYSCALL_DECL(err) long int err
 184
 185 # undef INTERNAL_SYSCALL
 186 # define INTERNAL_SYSCALL_NCS(name, err, nr, args...)                   \
 187   ({                                                                    \
 188     register long int r0  __asm__ ("r0");                               \
 189     register long int r3  __asm__ ("r3");                               \
 190     register long int r4  __asm__ ("r4");                               \
 191     register long int r5  __asm__ ("r5");                               \
 192     register long int r6  __asm__ ("r6");                               \
 193     register long int r7  __asm__ ("r7");                               \
 194     register long int r8  __asm__ ("r8");                               \
 195     register long int r9  __asm__ ("r9");                               \
 196     register long int r10 __asm__ ("r10");                              \
 197     register long int r11 __asm__ ("r11");                              \
 198     register long int r12 __asm__ ("r12");                              \
 199     LOADARGS_##nr(name, args);                                  \
 200     __asm__ __volatile__                                                \
 201       ("sc   \n\t"                                                      \
 202        "mfcr %0"                                                        \
 203        : "=&r" (r0),                                                    \
 204          "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),  \
 205          "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)  \
 206        : ASM_INPUT_##nr                                                 \
 207        : "cr0", "ctr", "memory");                                       \
 208     err = r0;                                                           \
 209     (int) r3;                                                           \
 210   })
 211 # define INTERNAL_SYSCALL(name, err, nr, args...) \
 212   INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
 213
 214 # undef INTERNAL_SYSCALL_ERROR_P
 215 # define INTERNAL_SYSCALL_ERROR_P(val, err) \
 216   ((void) (val), __builtin_expect ((err) & (1 << 28), 0))
 217
 218 # undef INTERNAL_SYSCALL_ERRNO
 219 # define INTERNAL_SYSCALL_ERRNO(val, err)     (val)
 220
 221 # define LOADARGS_0(name, dummy)                                              \
 222         r0 = name
 223 # define LOADARGS_1(name, __arg1) \
 224         long int arg1 = (long int) (__arg1);    \
 225   LOADARGS_0(name, 0);                                     \
 226         extern void __illegally_sized_syscall_arg1 (void); \
 227         if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
 228           __illegally_sized_syscall_arg1 (); \
 229         r3 = arg1
 230 # define LOADARGS_2(name, __arg1, __arg2) \
 231         long int arg2 = (long int) (__arg2); \
 232         LOADARGS_1(name, __arg1); \
 233         extern void __illegally_sized_syscall_arg2 (void); \
 234         if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
 235           __illegally_sized_syscall_arg2 (); \
 236         r4 = arg2
 237 # define LOADARGS_3(name, __arg1, __arg2, __arg3) \
 238         long int arg3 = (long int) (__arg3); \
 239         LOADARGS_2(name, __arg1, __arg2); \
 240         extern void __illegally_sized_syscall_arg3 (void); \
 241         if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
 242           __illegally_sized_syscall_arg3 (); \
 243         r5 = arg3
 244 # define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
 245         long int arg4 = (long int) (__arg4); \
 246         LOADARGS_3(name, __arg1, __arg2, __arg3); \
 247         extern void __illegally_sized_syscall_arg4 (void); \
 248         if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \
 249           __illegally_sized_syscall_arg4 (); \
 250         r6 = arg4
 251 # define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
 252         long int arg5 = (long int) (__arg5); \
 253         LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
 254         extern void __illegally_sized_syscall_arg5 (void); \
 255         if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
 256           __illegally_sized_syscall_arg5 (); \
 257         r7 = arg5
 258 # define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
 259         long int arg6 = (long int) (__arg6); \
 260         LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
 261         extern void __illegally_sized_syscall_arg6 (void); \
 262         if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
 263           __illegally_sized_syscall_arg6 (); \
 264         r8 = arg6
 265
 266 # define ASM_INPUT_0 "0" (r0)
 267 # define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
 268 # define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
 269 # define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
 270 # define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
 271 # define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 272 # define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 273
 274 #endif /* __ASSEMBLER__ */
 275
 276
 277 /* Pointer mangling support.  */
 278 #if defined NOT_IN_libc && defined IS_IN_rtld
 279 /* We cannot use the thread descriptor because in ld.so we use setjmp
 280    earlier than the descriptor is initialized.  */
 281 #else
 282 # ifdef __ASSEMBLER__
 283 #  define PTR_MANGLE(reg, tmpreg) \
 284         lwz     tmpreg,POINTER_GUARD(r2); \
 285         xor     reg,tmpreg,reg
 286 #  define PTR_MANGLE2(reg, tmpreg) \
 287         xor     reg,tmpreg,reg
 288 #  define PTR_MANGLE3(destreg, reg, tmpreg) \
 289         lwz     tmpreg,POINTER_GUARD(r2); \
 290         xor     destreg,tmpreg,reg
 291 #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
 292 #  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
 293 #  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
 294 # else
 295 #  define PTR_MANGLE(var) \
 296   (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
 297 #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
 298 # endif
 299 #endif
 300
 301 #endif /* linux/powerpc/powerpc32/sysdep.h */