sysdeps/arm/sysdep.h

   1 /* Assembler macros for ARM.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <sysdeps/generic/sysdep.h>
  21
  22 #ifdef  ASSEMBLER
  23
  24 /* Syntactic details of assembler.  */
  25
  26 #ifdef HAVE_ELF
  27
  28 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  29 #define ALIGNARG(log2) 1<<log2
  30 /* For ELF we need the `.type' directive to make shared libs work right.  */
  31 #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
  32 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  33
  34 /* In ELF C symbols are asm symbols.  */
  35 #undef  NO_UNDERSCORES
  36 #define NO_UNDERSCORES
  37
  38 #else
  39
  40 #define ALIGNARG(log2) log2
  41 #define ASM_TYPE_DIRECTIVE(name,type)   /* Nothing is specified.  */
  42 #define ASM_SIZE_DIRECTIVE(name)        /* Nothing is specified.  */
  43
  44 #endif
  45
  46 /* ARM 6 needs slightly different handling */
  47 #ifdef __arm6__
  48 #define LOADREGS(cond, base, reglist...)\
  49         ldm##cond       base,reglist
  50 #define RETINSTR(instr, regs...)\
  51         instr   regs
  52 #else  /* arm 3 */
  53 #define LOADREGS(cond, base, reglist...)\
  54         ldm##cond       base,reglist^
  55 #define RETINSTR(instr, regs...)\
  56         instr##s        regs
  57 #endif
  58
  59 /* Don't do floating point */
  60 #define __ARM_USES_FP   1
  61
  62 /* Define an entry point visible from C.  */
  63 #define ENTRY(name)                                                           \
  64   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  65   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  66   .align ALIGNARG(4);                                                         \
  67   C_LABEL(name)                                                               \
  68   CALL_MCOUNT
  69
  70 #undef  END
  71 #define END(name)                                                             \
  72   ASM_SIZE_DIRECTIVE(name)
  73
  74 /* If compiled for profiling, call `mcount' at the start of each function.  */
  75 #ifdef  PROF
  76 /* The mcount code relies on a normal frame pointer being on the stack
  77    to locate our caller, so push one just for its benefit.  */
  78 #define CALL_MCOUNT \
  79 #error Profiling not supported.
  80 #else
  81 #define CALL_MCOUNT             /* Do nothing.  */
  82 #endif
  83
  84 #ifdef  NO_UNDERSCORES
  85 /* Since C identifiers are not normally prefixed with an underscore
  86    on this system, the asm identifier `syscall_error' intrudes on the
  87    C name space.  Make sure we use an innocuous name.  */
  88 #define syscall_error   __syscall_error
  89 #define mcount          _mcount
  90 #endif
  91
  92 #endif  /* ASSEMBLER */