libc/sysdeps/linux/or1k/sysdep.h

   1 /* Copyright (C) 2011-2014 Free Software Foundation, Inc.
   2
   3 The GNU C Library is free software; you can redistribute it and/or
   4 modify it under the terms of the GNU Lesser General Public License as
   5 published by the Free Software Foundation; either version 2.1 of the
   6 License, or (at your option) any later version.
   7
   8 The GNU C Library is distributed in the hope that it will be useful,
   9 but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 Lesser General Public License for more details.
  12
  13 You should have received a copy of the GNU Lesser General Public
  14 License along with the GNU C Library; if not, see
  15 <http://www.gnu.org/licenses/>.  */
  16
  17 #ifndef _LINUX_OR1K_SYSDEP_H
  18 #define _LINUX_OR1K_SYSDEP_H 1
  19
  20 #include <common/sysdep.h>
  21 #include <sys/syscall.h>
  22
  23 /* In order to get __set_errno() definition in INLINE_SYSCALL.  */
  24 #ifndef __ASSEMBLER__
  25 #include <errno.h>
  26 #endif
  27
  28 #undef SYS_ify
  29 #define SYS_ify(syscall_name)   (__NR_##syscall_name)
  30
  31 #ifdef __ASSEMBLER__
  32
  33 /* Local label name for asm code. */
  34 #define L(name)         .L##name
  35
  36 #undef ret_ERRVAL
  37 #define ret_ERRVAL   l.jr r9; l.nop
  38 #define ret_NOERRNO  l.jr r9; l.nop
  39
  40 #undef DO_CALL
  41 #define DO_CALL(syscall_name) \
  42     l.addi r11, r0, SYS_ify (syscall_name); \
  43     l.sys 1; \
  44     l.nop
  45
  46 #define PSEUDO(name, syscall_name, args) \
  47   ENTRY (name); \
  48   DO_CALL(syscall_name); \
  49   /* if -4096 < ret < 0 holds, it's an error */ \
  50   l.sfgeui r11, 0xf001; \
  51   l.bf L(pseudo_end); \
  52    l.nop
  53
  54 #define PSEUDO_NOERRNO(name, syscall_name, args)  \
  55   ENTRY (name);           \
  56   DO_CALL(syscall_name)
  57
  58 #define PSEUDO_END(name) \
  59 L(pseudo_end): \
  60   l.j SYSCALL_ERROR_NAME; \
  61   l.ori r3,r11,0; \
  62   END (name)
  63
  64 #define PSEUDO_END_NOERRNO(name) \
  65   END (name)
  66
  67 #ifndef PIC
  68 /* For static code, on error jump to __syscall_error directly. */
  69 # define SYSCALL_ERROR_NAME __syscall_error
  70 #elif NOT_IN_libc
  71 /* Use the internal name for libc/libpthread shared objects. */
  72 # define SYSCALL_ERROR_NAME __GI___syscall_error
  73 #else
  74 /* Otherwise, on error do a full PLT jump. */
  75 # define SYSCALL_ERROR_NAME plt(__syscall_error)
  76 #endif
  77
  78 /* Make use of .size directive.  */
  79 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name;
  80
  81 /* Define an entry point visible from C.  */
  82 #define ENTRY(name)                                                           \
  83   .globl C_SYMBOL_NAME(name);                                                 \
  84   .type C_SYMBOL_NAME(name),@function;                                        \
  85   .align 4;                                                                   \
  86   C_LABEL(name)                                                               \
  87   cfi_startproc;                                                              \
  88
  89 #undef  END
  90 #define END(name)                                                             \
  91   cfi_endproc;                                                                \
  92   ASM_SIZE_DIRECTIVE(name)
  93
  94 /* Since C identifiers are not normally prefixed with an underscore
  95    on this system, the asm identifier `syscall_error' intrudes on the
  96    C name space.  Make sure we use an innocuous name.  */
  97 #define syscall_error   __syscall_error
  98
  99 /* Specify the size in bytes of a machine register.  */
 100 #define REGSIZE         4
 101
 102 #endif  /* __ASSEMBLER__ */
 103
 104 #endif /* linux/or1k/sysdep.h */