sysdeps/cris/sysdep.h

   1 /* Assembler macros for CRIS.
   2    Copyright (C) 1999, 2000, 2001 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 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdeps/generic/sysdep.h>
  21
  22 #ifndef HAVE_ELF
  23 # error ELF is assumed.  Generalize the code and retry.
  24 #endif
  25
  26 #ifndef NO_UNDERSCORES
  27 # error User-label prefix (underscore) assumed absent.  Generalize the code and retry.
  28 #endif
  29
  30 #ifdef  __ASSEMBLER__
  31
  32 /* Syntactic details of assembly-code.  */
  33
  34 /* It is *not* generally true that "ELF uses byte-counts for .align, most
  35    others use log2 of count of bytes", like some neighboring configs say.
  36    See "align" in gas/read.c which is not overridden by
  37    gas/config/obj-elf.c.  It takes a log2 argument.  *Some* targets
  38    override it to take a byte argument.  People should read source instead
  39    of relying on hearsay.  */
  40 # define ALIGNARG(log2) log2
  41
  42 # define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
  43 # define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  44
  45 /* The non-PIC jump is preferred, since it does not stall, and does not
  46    invoke generation of a PLT.  These macros assume that $r0 is set up as
  47    GOT register.  */
  48 # ifdef __PIC__
  49 #  define PLTJUMP(_x) \
  50   add.d C_SYMBOL_NAME (_x):PLT,$pc
  51
  52 #  define PLTCALL(_x) \
  53   move.d C_SYMBOL_NAME (_x):PLTG,$r9                    @ \
  54   add.d $r0,$r9                                         @ \
  55   jsr   $r9
  56
  57 #  define SETUP_PIC \
  58   push  $r0                                             @ \
  59   move.d $pc,$r0                                        @ \
  60   sub.d .:GOTOFF,$r0
  61
  62 #  define TEARDOWN_PIC pop $r0
  63 # else
  64 #  define PLTJUMP(_x) jump C_SYMBOL_NAME (_x)
  65 #  define PLTCALL(_x) jsr  C_SYMBOL_NAME (_x)
  66 #  define SETUP_PIC
  67 #  define TEARDOWN_PIC
  68 # endif
  69
  70 /* Define an entry point visible from C.  */
  71 # define ENTRY(name) \
  72   .text                                                 @ \
  73   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME (name)             @ \
  74   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME (name), function)   @ \
  75   .align ALIGNARG (2)                                   @ \
  76   C_LABEL(name)                                         @ \
  77   CALL_MCOUNT
  78
  79 # undef END
  80 # define END(name) \
  81   ASM_SIZE_DIRECTIVE (C_SYMBOL_NAME (name))
  82
  83 /* If compiled for profiling, call `mcount' at the start of each function.
  84    FIXME: Note that profiling is not actually implemented.  This is just
  85    example code which might not even compile, though it is believed to be
  86    correct.  */
  87 # ifdef PROF
  88 #  define CALL_MCOUNT \
  89   push  $srp                                            @ \
  90   push  $r9                                             @ \
  91   push  $r10                                            @ \
  92   push  $r11                                            @ \
  93   push  $r12                                            @ \
  94   push  $r13                                            @ \
  95   SETUP_PIC                                             @ \
  96   PLTCALL (mcount)                                      @ \
  97   TEARDOWN_PIC                                          @ \
  98   pop   $r13                                            @ \
  99   pop   $r12                                            @ \
 100   pop   $r11                                            @ \
 101   pop   $r10                                            @ \
 102   pop   $r9                                             @ \
 103   pop   $srp
 104 # else
 105 #  define CALL_MCOUNT           /* Do nothing.  */
 106 # endif
 107
 108 /* Since C identifiers are not normally prefixed with an underscore
 109    on this system, the asm identifier `syscall_error' intrudes on the
 110    C name space.  Make sure we use an innocuous name.  */
 111 # define syscall_error  __syscall_error
 112 # define mcount         _mcount
 113
 114 #endif  /* __ASSEMBLER__ */