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

   1 /* Copyright (C) 1992-2015 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* Alan Modra <amodra@bigpond.net.au> rewrote the INLINE_SYSCALL macro */
  19
  20 #ifndef _LINUX_POWERPC_SYSDEP_H
  21 #define _LINUX_POWERPC_SYSDEP_H 1
  22
  23 #include <sysdeps/unix/powerpc/sysdep.h>
  24 #include <tls.h>
  25
  26 /* Define __set_errno() for INLINE_SYSCALL macro below.  */
  27 #ifndef __ASSEMBLER__
  28 #include <errno.h>
  29 #endif
  30
  31 /* Some systen calls got renamed over time, but retained the same semantics.
  32    Handle them here so they can be catched by both C and assembler stubs in
  33    glibc.  */
  34
  35 #ifdef __NR_pread64
  36 # ifdef __NR_pread
  37 #  error "__NR_pread and __NR_pread64 both defined???"
  38 # endif
  39 # define __NR_pread __NR_pread64
  40 #endif
  41
  42 #ifdef __NR_pwrite64
  43 # ifdef __NR_pwrite
  44 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  45 # endif
  46 # define __NR_pwrite __NR_pwrite64
  47 #endif
  48
  49 /* For Linux we can use the system call table in the header file
  50         /usr/include/asm/unistd.h
  51    of the kernel.  But these symbols do not follow the SYS_* syntax
  52    so we have to redefine the `SYS_ify' macro here.  */
  53 #undef SYS_ify
  54 #define SYS_ify(syscall_name)   __NR_##syscall_name
  55
  56 #ifdef __ASSEMBLER__
  57
  58 /* This seems to always be the case on PPC.  */
  59 # define ALIGNARG(log2) log2
  60 # define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  61
  62 #endif /* __ASSEMBLER__ */
  63
  64 /* This version is for kernels that implement system calls that
  65    behave like function calls as far as register saving.
  66    It falls back to the syscall in the case that the vDSO doesn't
  67    exist or fails for ENOSYS */
  68 #ifdef SHARED
  69 # define INLINE_VSYSCALL(name, nr, args...) \
  70   ({                                                                          \
  71     __label__ out;                                                            \
  72     __label__ iserr;                                                          \
  73     INTERNAL_SYSCALL_DECL (sc_err);                                           \
  74     long int sc_ret;                                                          \
  75                                                                               \
  76     if (__vdso_##name != NULL)                                                \
  77       {                                                                       \
  78         sc_ret =                                                              \
  79           INTERNAL_VSYSCALL_NCS (__vdso_##name, sc_err, long int, nr, ##args);\
  80         if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                       \
  81           goto out;                                                           \
  82         if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS)                \
  83           goto iserr;                                                         \
  84       }                                                                       \
  85                                                                               \
  86     sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args);                     \
  87     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                            \
  88       {                                                                       \
  89       iserr:                                                                  \
  90         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));                \
  91         sc_ret = -1L;                                                         \
  92       }                                                                       \
  93   out:                                                                        \
  94     sc_ret;                                                                   \
  95   })
  96 #else
  97 # define INLINE_VSYSCALL(name, nr, args...) \
  98   INLINE_SYSCALL (name, nr, ##args)
  99 #endif
 100
 101 #ifdef SHARED
 102 # define INTERNAL_VSYSCALL(name, err, nr, args...) \
 103   ({                                                                          \
 104     __label__ out;                                                            \
 105     long int v_ret;                                                           \
 106                                                                               \
 107     if (__vdso_##name != NULL)                                                \
 108       {                                                                       \
 109         v_ret =                                                               \
 110           INTERNAL_VSYSCALL_NCS (__vdso_##name, err, long int, nr, ##args);   \
 111         if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err)                            \
 112             || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS)                 \
 113           goto out;                                                           \
 114       }                                                                       \
 115     v_ret = INTERNAL_SYSCALL (name, err, nr, ##args);                         \
 116   out:                                                                        \
 117     v_ret;                                                                    \
 118   })
 119 #else
 120 # define INTERNAL_VSYSCALL(name, err, nr, args...) \
 121   INTERNAL_SYSCALL (name, err, nr, ##args)
 122 #endif
 123
 124 /* This version is for internal uses when there is no desire
 125    to set errno */
 126 #define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...)   \
 127   ({                                                                          \
 128     type sc_ret = ENOSYS;                                                     \
 129                                                                               \
 130     if (__vdso_##name != NULL)                                                \
 131       sc_ret = INTERNAL_VSYSCALL_NCS (__vdso_##name, err, type, nr, ##args);  \
 132     else                                                                      \
 133       err = 1 << 28;                                                          \
 134     sc_ret;                                                                   \
 135   })
 136
 137 /* List of system calls which are supported as vsyscalls.  */
 138 #define HAVE_CLOCK_GETRES_VSYSCALL      1
 139 #define HAVE_CLOCK_GETTIME_VSYSCALL     1
 140
 141 /* Define a macro which expands inline into the wrapper code for a system
 142    call. This use is for internal calls that do not need to handle errors
 143    normally. It will never touch errno. This returns just what the kernel
 144    gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
 145    the negation of the return value in the kernel gets reverted.  */
 146
 147 #define INTERNAL_VSYSCALL_NCS(funcptr, err, type, nr, args...) \
 148   ({                                                                    \
 149     register void *r0  __asm__ ("r0");                                  \
 150     register long int r3  __asm__ ("r3");                               \
 151     register long int r4  __asm__ ("r4");                               \
 152     register long int r5  __asm__ ("r5");                               \
 153     register long int r6  __asm__ ("r6");                               \
 154     register long int r7  __asm__ ("r7");                               \
 155     register long int r8  __asm__ ("r8");                               \
 156     register type rval  __asm__ ("r3");                                 \
 157     LOADARGS_##nr (funcptr, args);                                      \
 158     __asm__ __volatile__                                                \
 159       ("mtctr %0\n\t"                                                   \
 160        "bctrl\n\t"                                                      \
 161        "mfcr  %0\n\t"                                                   \
 162        "0:"                                                             \
 163        : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5),  "+r" (r6),        \
 164          "+r" (r7), "+r" (r8)                                           \
 165        : : "r9", "r10", "r11", "r12", "cr0", "ctr", "lr", "memory");    \
 166     err = (long int) r0;                                                \
 167     __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3));                 \
 168     rval;                                                               \
 169   })
 170
 171 #undef INLINE_SYSCALL
 172
 173 /* This version is for kernels that implement system calls that
 174    behave like function calls as far as register saving.  */
 175 #define INLINE_SYSCALL(name, nr, args...)                               \
 176   ({                                                                    \
 177     INTERNAL_SYSCALL_DECL (sc_err);                                     \
 178     long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);        \
 179     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                      \
 180       {                                                                 \
 181         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));          \
 182         sc_ret = -1L;                                                   \
 183       }                                                                 \
 184     sc_ret;                                                             \
 185   })
 186
 187 /* Define a macro which expands inline into the wrapper code for a system
 188    call. This use is for internal calls that do not need to handle errors
 189    normally. It will never touch errno. This returns just what the kernel
 190    gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
 191    the negation of the return value in the kernel gets reverted.  */
 192
 193 #undef INTERNAL_SYSCALL
 194 #define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
 195   ({                                                                    \
 196     register long int r0  __asm__ ("r0");                               \
 197     register long int r3  __asm__ ("r3");                               \
 198     register long int r4  __asm__ ("r4");                               \
 199     register long int r5  __asm__ ("r5");                               \
 200     register long int r6  __asm__ ("r6");                               \
 201     register long int r7  __asm__ ("r7");                               \
 202     register long int r8  __asm__ ("r8");                               \
 203     LOADARGS_##nr (name, ##args);                                       \
 204     __asm__ __volatile__                                                \
 205       ("sc\n\t"                                                         \
 206        "mfcr  %0\n\t"                                                   \
 207        "0:"                                                             \
 208        : "=&r" (r0),                                                    \
 209          "=&r" (r3), "=&r" (r4), "=&r" (r5),                            \
 210          "=&r" (r6), "=&r" (r7), "=&r" (r8)                             \
 211        : ASM_INPUT_##nr                                                 \
 212        : "r9", "r10", "r11", "r12",                                     \
 213          "cr0", "ctr", "memory");                                       \
 214           err = r0;  \
 215     r3;  \
 216   })
 217 #define INTERNAL_SYSCALL(name, err, nr, args...)                        \
 218   INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, args)
 219
 220 #undef INTERNAL_SYSCALL_DECL
 221 #define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
 222
 223 #undef INTERNAL_SYSCALL_ERROR_P
 224 #define INTERNAL_SYSCALL_ERROR_P(val, err) \
 225   ((void) (val), __builtin_expect ((err) & (1 << 28), 0))
 226
 227 #undef INTERNAL_SYSCALL_ERRNO
 228 #define INTERNAL_SYSCALL_ERRNO(val, err)     (val)
 229
 230 #define LOADARGS_0(name, dummy) \
 231         r0 = name
 232 #define LOADARGS_1(name, __arg1) \
 233         long int arg1 = (long int) (__arg1); \
 234         LOADARGS_0(name, 0); \
 235         extern void __illegally_sized_syscall_arg1 (void); \
 236         if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 8) \
 237           __illegally_sized_syscall_arg1 (); \
 238         r3 = arg1
 239 #define LOADARGS_2(name, __arg1, __arg2) \
 240         long int arg2 = (long int) (__arg2); \
 241         LOADARGS_1(name, __arg1); \
 242         extern void __illegally_sized_syscall_arg2 (void); \
 243         if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 8) \
 244           __illegally_sized_syscall_arg2 (); \
 245         r4 = arg2
 246 #define LOADARGS_3(name, __arg1, __arg2, __arg3) \
 247         long int arg3 = (long int) (__arg3); \
 248         LOADARGS_2(name, __arg1, __arg2); \
 249         extern void __illegally_sized_syscall_arg3 (void); \
 250         if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 8) \
 251           __illegally_sized_syscall_arg3 (); \
 252         r5 = arg3
 253 #define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
 254         long int arg4 = (long int) (__arg4); \
 255         LOADARGS_3(name, __arg1, __arg2, __arg3); \
 256         extern void __illegally_sized_syscall_arg4 (void); \
 257         if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 8) \
 258           __illegally_sized_syscall_arg4 (); \
 259         r6 = arg4
 260 #define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
 261         long int arg5 = (long int) (__arg5); \
 262         LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
 263         extern void __illegally_sized_syscall_arg5 (void); \
 264         if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 8) \
 265           __illegally_sized_syscall_arg5 (); \
 266         r7 = arg5
 267 #define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
 268         long int arg6 = (long int) (__arg6); \
 269         LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
 270         extern void __illegally_sized_syscall_arg6 (void); \
 271         if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 8) \
 272           __illegally_sized_syscall_arg6 (); \
 273         r8 = arg6
 274
 275 #define ASM_INPUT_0 "0" (r0)
 276 #define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
 277 #define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
 278 #define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
 279 #define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
 280 #define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
 281 #define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
 282
 283
 284 /* Pointer mangling support.  */
 285 #if IS_IN (rtld)
 286 /* We cannot use the thread descriptor because in ld.so we use setjmp
 287    earlier than the descriptor is initialized.  */
 288 #else
 289 # ifdef __ASSEMBLER__
 290 #  define PTR_MANGLE(reg, tmpreg) \
 291         ld      tmpreg,POINTER_GUARD(r13); \
 292         xor     reg,tmpreg,reg
 293 #  define PTR_MANGLE2(reg, tmpreg) \
 294         xor     reg,tmpreg,reg
 295 #  define PTR_MANGLE3(destreg, reg, tmpreg) \
 296         ld      tmpreg,POINTER_GUARD(r13); \
 297         xor     destreg,tmpreg,reg
 298 #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
 299 #  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
 300 #  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
 301 # else
 302 #  define PTR_MANGLE(var) \
 303   (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
 304 #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
 305 # endif
 306 #endif
 307
 308 #endif /* linux/powerpc/powerpc64/sysdep.h */