libc/sysdeps/linux/microblaze/sysdep.h

   1 /* Copyright (C) 2000-2016 Free Software Foundation, Inc.
   2
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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 <common/sysdep.h>
  20
  21 #ifdef  __ASSEMBLER__
  22
  23 # define ALIGNARG(log2) log2
  24 # define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  25
  26 /* Define an entry point visible from C.  */
  27 # define ENTRY(name)                          \
  28   .globl C_SYMBOL_NAME(name);                 \
  29   .type C_SYMBOL_NAME(name),@function;        \
  30   .align ALIGNARG(2);                         \
  31   C_LABEL(name)
  32
  33 # undef END
  34 # define END(name) ASM_SIZE_DIRECTIVE(name)
  35
  36 /* Local label name for asm code.  */
  37 # ifndef L
  38 #  define L(name) $L##name
  39 # endif
  40
  41 /* We don't want the label for the error handler to be visible in the symbol
  42    table when we define it here.  */
  43 # ifdef __PIC__
  44 #  define SYSCALL_ERROR_LABEL 0f
  45 # else
  46 #  define SYSCALL_ERROR_LABEL __syscall_error
  47 # endif
  48
  49 # define DO_CALL(syscall_name, args)                \
  50     addik r12,r0,SYS_ify (syscall_name);            \
  51     brki  r14,8;                                    \
  52     addk  r0,r0,r0;
  53
  54 # undef PSEUDO
  55 # define PSEUDO(name, syscall_name, args)           \
  56   .text;                                            \
  57   ENTRY (name)                                      \
  58     DO_CALL (syscall_name, args);                   \
  59     addik r12,r0,-4095;                             \
  60     cmpu  r12,r12,r3;                               \
  61     bgei  r12,SYSCALL_ERROR_LABEL;
  62
  63 # undef PSEUDO_END
  64 # define PSEUDO_END(name)                           \
  65   SYSCALL_ERROR_HANDLER;                            \
  66   END (name)
  67
  68 # undef PSEUDO_NOERRNO
  69 # define PSEUDO_NOERRNO(name, syscall_name, args)   \
  70   .text;                                            \
  71   ENTRY (name)                                      \
  72     DO_CALL (syscall_name, args);
  73
  74 # undef PSEUDO_END_NOERRNO
  75 # define PSEUDO_END_NOERRNO(name)                   \
  76   END (name)
  77
  78 /* The function has to return the error code.  */
  79 # undef  PSEUDO_ERRVAL
  80 # define PSEUDO_ERRVAL(name, syscall_name, args)    \
  81   .text;                                            \
  82   ENTRY (name)                                      \
  83     DO_CALL (syscall_name, args);                   \
  84
  85 # undef  PSEUDO_END_ERRVAL
  86 # define PSEUDO_END_ERRVAL(name)                    \
  87   END (name)
  88
  89 # undef ret_NOERRNO
  90 # define ret_NOERRNO                                \
  91   rtsd r15,8; addk r0,r0,r0;
  92
  93 # undef ret_ERRVAL
  94 # define ret_ERRVAL                                 \
  95   rtsd r15,8; rsubk r3,r3,r0;
  96
  97 #ifdef __PIC__
  98 # define SYSCALL_ERROR_LABEL_DCL 0
  99 # if defined _LIBC_REENTRANT
 100 #  define SYSCALL_ERROR_HANDLER                     \
 101 SYSCALL_ERROR_LABEL_DCL:                            \
 102     addik r1,r1,-16;                                \
 103     swi   r15,r1,0;                                 \
 104     swi   r20,r1,8;                                 \
 105     rsubk r3,r3,r0;                                 \
 106     swi   r3,r1,12;                                 \
 107     mfs   r20,rpc;                                  \
 108     addik r20,r20,_GLOBAL_OFFSET_TABLE_+8;          \
 109     brlid r15,__errno_location@PLT;                 \
 110     nop;                                            \
 111     lwi   r4,r1,12;                                 \
 112     swi   r4,r3,0;                                  \
 113     lwi   r20,r1,8;                                 \
 114     lwi   r15,r1,0;                                 \
 115     addik r1,r1,16;                                 \
 116     rtsd  r15,8;                                    \
 117     addik r3,r0,-1;
 118 # else /* !_LIBC_REENTRANT.  */
 119 #  define SYSCALL_ERROR_HANDLER                     \
 120 SYSCALL_ERROR_LABEL_DCL:                            \
 121     mfs   r12,rpc;                                  \
 122     addik r12,r12,_GLOBAL_OFFSET_TABLE_+8;          \
 123     lwi   r12,r12,errno@GOT;                        \
 124     rsubk r3,r3,r0;                                 \
 125     swi   r3,r12,0;                                 \
 126     rtsd  r15,8;                                    \
 127     addik r3,r0,-1;
 128 # endif /* _LIBC_REENTRANT.  */
 129 #else
 130 #  define SYSCALL_ERROR_HANDLER  /* Nothing here; code in sysdep.S is used.  */
 131 #endif /* PIC.  */
 132
 133 #endif