sysdeps/m68k/sysdep.h

   1 /* Assembler macros for m68k.
   2    Copyright (C) 1998, 2003, 2010, 2012 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 #ifdef __ASSEMBLER__
  23
  24 /* Syntactic details of assembler.  */
  25
  26 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  27 # define ALIGNARG(log2) 1<<log2
  28 /* For ELF we need the `.type' directive to make shared libs work right.  */
  29 # define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
  30 # define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  31
  32 /* Define an entry point visible from C.
  33
  34    There is currently a bug in gdb which prevents us from specifying
  35    incomplete stabs information.  Fake some entries here which specify
  36    the current source file.  */
  37 # define ENTRY(name)                                                          \
  38   .globl C_SYMBOL_NAME(name);                                                 \
  39   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function);                         \
  40   .align ALIGNARG(2);                                                         \
  41   C_LABEL(name)                                                               \
  42   cfi_startproc;                                                              \
  43   CALL_MCOUNT
  44
  45 # undef END
  46 # define END(name)                                                            \
  47   cfi_endproc;                                                                \
  48   ASM_SIZE_DIRECTIVE(name)
  49
  50
  51 /* If compiled for profiling, call `_mcount' at the start of each function.  */
  52 # ifdef PROF
  53 /* The mcount code relies on a normal frame pointer being on the stack
  54    to locate our caller, so push one just for its benefit.  */
  55 #  define CALL_MCOUNT \
  56   move.l %fp, -(%sp);                                                         \
  57   cfi_adjust_cfa_offset (4);  cfi_rel_offset (%fp, 0);                        \
  58   move.l %sp, %fp;                                                            \
  59   jbsr JUMPTARGET (_mcount);                                                  \
  60   move.l (%sp)+, %fp;                                                         \
  61   cfi_adjust_cfa_offset (-4); cfi_restore (%fp);
  62 # else
  63 #  define CALL_MCOUNT           /* Do nothing.  */
  64 # endif
  65
  66 # define PSEUDO(name, syscall_name, args)                                     \
  67   .globl __syscall_error;                                                     \
  68   ENTRY (name)                                                                \
  69     DO_CALL (syscall_name, args);                                             \
  70     jcc JUMPTARGET(__syscall_error)
  71
  72 # undef PSEUDO_END
  73 # define PSEUDO_END(name)                                                     \
  74   END (name)
  75
  76 # undef JUMPTARGET
  77 # ifdef PIC
  78 #  define JUMPTARGET(name)      name##@PLTPC
  79 # else
  80 #  define JUMPTARGET(name)      name
  81 # endif
  82
  83 #endif  /* __ASSEMBLER__ */