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

   1 /* Copyright (C) 2011-2014 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 !defined NOT_IN_libc || defined 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 #endif /* not __ASSEMBLER__ */
 206
 207 /* Pointer mangling support.  */
 208 #if defined NOT_IN_libc && defined IS_IN_rtld
 209 /* We cannot use the thread descriptor because in ld.so we use setjmp
 210    earlier than the descriptor is initialized.  */
 211 #else
 212 # ifdef __ASSEMBLER__
 213 #  define PTR_MANGLE(reg, tmpreg) \
 214         ADDLI_PTR tmpreg, pt, POINTER_GUARD; \
 215         LD      tmpreg, tmpreg; \
 216         xor     reg, tmpreg, reg
 217 #  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
 218 # else
 219 #  define PTR_MANGLE(var) \
 220   (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
 221 #  define PTR_DEMANGLE(var)     PTR_MANGLE (var)
 222 # endif
 223 #endif