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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdeps/generic/sysdep.h>
  20
  21 #ifdef __ASSEMBLER__
  22
  23 /* Syntactic details of assembler.  */
  24
  25 /* ELF uses byte-counts for .align, most others use log2 of count of bytes.  */
  26 # define ALIGNARG(log2) 1<<log2
  27 /* For ELF we need the `.type' directive to make shared libs work right.  */
  28 # define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg
  29 # define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  30
  31 /* Define an entry point visible from C.
  32
  33    There is currently a bug in gdb which prevents us from specifying
  34    incomplete stabs information.  Fake some entries here which specify
  35    the current source file.  */
  36 # define ENTRY(name)                                                          \
  37   .globl C_SYMBOL_NAME(name);                                                 \
  38   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function);                         \
  39   .align ALIGNARG(2);                                                         \
  40   C_LABEL(name)                                                               \
  41   cfi_startproc;                                                              \
  42   CALL_MCOUNT
  43
  44 # undef END
  45 # define END(name)                                                            \
  46   cfi_endproc;                                                                \
  47   ASM_SIZE_DIRECTIVE(name)
  48
  49
  50 /* If compiled for profiling, call `_mcount' at the start of each function.  */
  51 # ifdef PROF
  52 /* The mcount code relies on a normal frame pointer being on the stack
  53    to locate our caller, so push one just for its benefit.  */
  54 #  define CALL_MCOUNT \
  55   move.l %fp, -(%sp);                                                         \
  56   cfi_adjust_cfa_offset (4);  cfi_rel_offset (%fp, 0);                        \
  57   move.l %sp, %fp;                                                            \
  58   jbsr JUMPTARGET (_mcount);                                                  \
  59   move.l (%sp)+, %fp;                                                         \
  60   cfi_adjust_cfa_offset (-4); cfi_restore (%fp);
  61 # else
  62 #  define CALL_MCOUNT           /* Do nothing.  */
  63 # endif
  64
  65 # define PSEUDO(name, syscall_name, args)                                     \
  66   .globl __syscall_error;                                                     \
  67   ENTRY (name)                                                                \
  68     DO_CALL (syscall_name, args);                                             \
  69     jcc JUMPTARGET(__syscall_error)
  70
  71 # undef PSEUDO_END
  72 # define PSEUDO_END(name)                                                     \
  73   END (name)
  74
  75 # undef JUMPTARGET
  76 # ifdef PIC
  77 #  define JUMPTARGET(name)      name##@PLTPC
  78 # else
  79 #  define JUMPTARGET(name)      name
  80 # endif
  81
  82 #endif  /* __ASSEMBLER__ */