sysdeps/unix/sysv/linux/tile/sysdep.h

   1 /* Copyright (C) 2011-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
   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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <asm/unistd.h>
  20 #include <sysdeps/tile/sysdep.h>
  21 #include <sysdeps/unix/sysv/linux/generic/sysdep.h>
  22 #include <sys/syscall.h>
  23
  24 #undef SYS_ify
  25 #define SYS_ify(syscall_name)   __NR_##syscall_name
  26
  27
  28 #ifdef __ASSEMBLER__
  29
  30 /* The actual implementation of doing a syscall. */
  31 #define DO_CALL(syscall_name, args)                     \
  32   moveli TREG_SYSCALL_NR_NAME, SYS_ify(syscall_name);   \
  33   swint1
  34
  35 /* TILE Linux returns the result in r0 (or a negative errno).
  36    The kernel "owns" the code to decide if a given value is an error,
  37    and puts errno in r1 if so, or otherwise zero.  */
  38 #define PSEUDO(name, syscall_name, args)                \
  39   ENTRY (name);                                         \
  40   DO_CALL(syscall_name, args);                          \
  41   BNEZ r1, 0f
  42
  43 #define ret  jrp lr
  44
  45 #ifndef PIC
  46 /* For static code, on error jump to __syscall_error directly. */
  47 # define SYSCALL_ERROR_NAME __syscall_error
  48 #elif IS_IN (libc) || IS_IN (libpthread)
  49 /* Use the internal name for libc/libpthread shared objects. */
  50 # define SYSCALL_ERROR_NAME __GI___syscall_error
  51 #else
  52 /* Otherwise, on error do a full PLT jump. */
  53 # define SYSCALL_ERROR_NAME plt(__syscall_error)
  54 #endif
  55
  56 #define PSEUDO_END(name)                                \
  57 0:                                                      \
  58   j SYSCALL_ERROR_NAME;                                 \
  59   END (name)
  60
  61 #define PSEUDO_NOERRNO(name, syscall_name, args)        \
  62   ENTRY (name);                                         \
  63   DO_CALL(syscall_name, args)
  64
  65 #define ret_NOERRNO  jrp lr
  66
  67 #define PSEUDO_END_NOERRNO(name) \
  68   END (name)
  69
  70 /* Convenience wrappers. */
  71 #define SYSCALL__(name, args)   PSEUDO (__##name, name, args)
  72 #define SYSCALL(name, args)   PSEUDO (name, name, args)
  73
  74 #else /* not __ASSEMBLER__ */
  75
  76 #include <errno.h>
  77
  78 /* Define a macro which expands inline into the wrapper code for a system
  79    call.  */
  80 # undef INLINE_SYSCALL
  81 # define INLINE_SYSCALL(name, nr, args...) \
  82   ({                                                                    \
  83     INTERNAL_SYSCALL_DECL (err);                                        \
  84     unsigned long val = INTERNAL_SYSCALL (name, err, nr, args);         \
  85     if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (val, err), 0))      \
  86       {                                                                 \
  87         __set_errno (INTERNAL_SYSCALL_ERRNO (val, err));                \
  88         val = -1;                                                       \
  89       }                                                                 \
  90     (long) val; })
  91
  92 #undef INTERNAL_SYSCALL
  93 #define INTERNAL_SYSCALL(name, err, nr, args...)        \
  94   internal_syscall##nr (SYS_ify (name), err, args)
  95
  96 #undef INTERNAL_SYSCALL_NCS
  97 #define INTERNAL_SYSCALL_NCS(number, err, nr, args...)  \
  98   internal_syscall##nr (number, err, args)
  99
 100 #undef INTERNAL_SYSCALL_DECL
 101 #define INTERNAL_SYSCALL_DECL(err) int err
 102
 103 #undef INTERNAL_SYSCALL_ERROR_P
 104 #define INTERNAL_SYSCALL_ERROR_P(val, err) ({ (void) (val); (err) != 0; })
 105
 106 #undef INTERNAL_SYSCALL_ERRNO
 107 #define INTERNAL_SYSCALL_ERRNO(val, err) ({ (void) (val); (err); })
 108
 109 #define internal_syscall0(num, err, dummy...)                           \
 110   ({                                                                    \
 111     long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
 112     __asm__ __volatile__ (                                              \
 113       "swint1"                                                          \
 114       : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
 115       : "R10" (num)                                                     \
 116       : __SYSCALL_CLOBBERS);                                            \
 117     _sys_result;                                                        \
 118   })
 119
 120 #define internal_syscall1(num, err, arg0)                               \
 121   ({                                                                    \
 122     long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
 123     __asm__ __volatile__ (                                              \
 124       "swint1"                                                          \
 125       : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
 126       : "R10" (num), "R00" (arg0)                                       \
 127       : __SYSCALL_CLOBBERS);                                            \
 128     _sys_result;                                                        \
 129   })
 130
 131 #define internal_syscall2(num, err, arg0, arg1)                         \
 132   ({                                                                    \
 133     long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
 134     __asm__ __volatile__ (                                              \
 135       "swint1"                                                          \
 136       : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
 137       : "R10" (num), "R00" (arg0), "R01" (arg1)                         \
 138       : __SYSCALL_CLOBBERS);                                            \
 139     _sys_result;                                                        \
 140   })
 141
 142 #define internal_syscall3(num, err, arg0, arg1, arg2)                   \
 143   ({                                                                    \
 144     long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
 145     __asm__ __volatile__ (                                              \
 146       "swint1"                                                          \
 147       : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
 148       : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2)           \
 149       : __SYSCALL_CLOBBERS);                                            \
 150     _sys_result;                                                        \
 151   })
 152
 153 #define internal_syscall4(num, err, arg0, arg1, arg2, arg3)             \
 154   ({                                                                    \
 155     long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
 156     __asm__ __volatile__ (                                              \
 157       "swint1"                                                          \
 158       : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
 159       : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2),          \
 160         "R03" (arg3)                                                    \
 161       : __SYSCALL_CLOBBERS);                                            \
 162     _sys_result;                                                        \
 163   })
 164
 165 #define internal_syscall5(num, err, arg0, arg1, arg2, arg3, arg4)       \
 166   ({                                                                    \
 167     long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
 168     __asm__ __volatile__ (                                              \
 169       "swint1"                                                          \
 170       : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
 171       : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2),          \
 172         "R03" (arg3), "R04" (arg4)                                      \
 173       : __SYSCALL_CLOBBERS);                                            \
 174     _sys_result;                                                        \
 175   })
 176
 177 #define internal_syscall6(num, err, arg0, arg1, arg2, arg3, arg4, arg5) \
 178   ({                                                                    \
 179     long _sys_result, __SYSCALL_CLOBBER_DECLS;                          \
 180     __asm__ __volatile__ (                                              \
 181       "swint1"                                                          \
 182       : "=R00" (_sys_result), "=R01" (err), __SYSCALL_CLOBBER_OUTPUTS   \
 183       : "R10" (num), "R00" (arg0), "R01" (arg1), "R02" (arg2),          \
 184         "R03" (arg3), "R04" (arg4), "R05" (arg5)                        \
 185       : __SYSCALL_CLOBBERS);                                            \
 186     _sys_result;                                                        \
 187   })
 188
 189 #undef __SYSCALL_CLOBBERS
 190 #define __SYSCALL_CLOBBERS                                      \
 191   "r6",  "r7",                                                  \
 192     "r8",  "r9",        "r11", "r12", "r13", "r14", "r15",      \
 193     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",     \
 194     "r24", "r25", "r26", "r27", "r28", "r29", "memory"
 195
 196 /* gcc doesn't seem to allow an input operand to be clobbered, so we
 197    fake it with dummy outputs. */
 198 #define __SYSCALL_CLOBBER_DECLS                                         \
 199   _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10
 200
 201 #define __SYSCALL_CLOBBER_OUTPUTS                                       \
 202   "=R02" (_clobber_r2), "=R03" (_clobber_r3), "=R04" (_clobber_r4),     \
 203     "=R05" (_clobber_r5), "=R10" (_clobber_r10)
 204
 205 /* This version is for kernels that implement system calls that
 206    behave like function calls as far as register saving.
 207    It falls back to the syscall in the case that the vDSO doesn't
 208    exist or fails for ENOSYS */
 209 # ifdef SHARED
 210 #  define INLINE_VSYSCALL(name, nr, args...) \
 211   ({                                                                          \
 212     __label__ out;                                                            \
 213     __label__ iserr;                                                          \
 214     INTERNAL_SYSCALL_DECL (sc_err);                                           \
 215     long int sc_ret;                                                          \
 216                                                                               \
 217     __typeof (__vdso_##name) vdsop = __vdso_##name;                           \
 218     if (vdsop != NULL)                                                        \
 219       {                                                                       \
 220         sc_ret = vdsop (args);                                                \
 221         if (!INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                       \
 222           goto out;                                                           \
 223         if (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err) != ENOSYS)                \
 224           goto iserr;                                                         \
 225       }                                                                       \
 226                                                                               \
 227     sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, ##args);                     \
 228     if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))                            \
 229       {                                                                       \
 230       iserr:                                                                  \
 231         __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));                \
 232         sc_ret = -1L;                                                         \
 233       }                                                                       \
 234   out:                                                                        \
 235     sc_ret;                                                                   \
 236   })
 237 #  define INTERNAL_VSYSCALL(name, err, nr, args...) \
 238   ({                                                                          \
 239     __label__ out;                                                            \
 240     long int v_ret;                                                           \
 241                                                                               \
 242     __typeof (__vdso_##name) vdsop = __vdso_##name;                           \
 243     if (vdsop != NULL)                                                        \
 244       {                                                                       \
 245         v_ret = vdsop (args);                                                 \
 246         if (!INTERNAL_SYSCALL_ERROR_P (v_ret, err)                            \
 247             || INTERNAL_SYSCALL_ERRNO (v_ret, err) != ENOSYS)                 \
 248           goto out;                                                           \
 249       }                                                                       \
 250     v_ret = INTERNAL_SYSCALL (name, err, nr, ##args);                         \
 251   out:                                                                        \
 252     v_ret;                                                                    \
 253   })
 254
 255 # else
 256 #  define INLINE_VSYSCALL(name, nr, args...) \
 257   INLINE_SYSCALL (name, nr, ##args)
 258 #  define INTERNAL_VSYSCALL(name, err, nr, args...) \
 259   INTERNAL_SYSCALL (name, err, nr, ##args)
 260 # endif
 261 #endif /* not __ASSEMBLER__ */
 262
 263 /* List of system calls which are supported as vsyscalls.  */
 264 #define HAVE_CLOCK_GETTIME_VSYSCALL     1
 265
 266 /* Pointer mangling support.  */
 267 #if IS_IN (rtld)
 268 /* We cannot use the thread descriptor because in ld.so we use setjmp
 269    earlier than the descriptor is initialized.  */
 270 #else
 271 # ifdef __ASSEMBLER__
 272 #  define PTR_MANGLE(reg, tmpreg) \
 273         ADDLI_PTR tmpreg, pt, POINTER_GUARD; \
 274         LD      tmpreg, tmpreg; \
 275         xor     reg, tmpreg, reg
 276 #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
 277 # else
 278 #  define PTR_MANGLE(var) \
 279   (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
 280 #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
 281 # endif
 282 #endif