sysdeps/m68k/sysdep.h

   1 /* Assembler macros for m68k.
   2    Copyright (C) 1998-2023 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sysdeps/generic/sysdep.h>
  20
  21 #ifdef __ASSEMBLER__
  22
  23 /* Define an entry point visible from C.
  24
  25    There is currently a bug in gdb which prevents us from specifying
  26    incomplete stabs information.  Fake some entries here which specify
  27    the current source file.  */
  28 # define ENTRY(name)                                                          \
  29   .globl C_SYMBOL_NAME(name);                                                 \
  30   .type C_SYMBOL_NAME(name),@function;                                        \
  31   .p2align 2;                                                                 \
  32   C_LABEL(name)                                                               \
  33   cfi_startproc;                                                              \
  34   CALL_MCOUNT
  35
  36 # undef END
  37 # define END(name)                                                            \
  38   cfi_endproc;                                                                \
  39   .size name,.-name
  40
  41
  42 /* If compiled for profiling, call `_mcount' at the start of each function.  */
  43 # ifdef PROF
  44 /* The mcount code relies on a normal frame pointer being on the stack
  45    to locate our caller, so push one just for its benefit.  */
  46 #  define CALL_MCOUNT \
  47   move.l %fp, -(%sp);                                                         \
  48   cfi_adjust_cfa_offset (4);  cfi_rel_offset (%a6, 0);                        \
  49   move.l %sp, %fp;                                                            \
  50   jbsr JUMPTARGET (_mcount);                                                  \
  51   move.l (%sp)+, %fp;                                                         \
  52   cfi_adjust_cfa_offset (-4); cfi_restore (%a6);
  53 # else
  54 #  define CALL_MCOUNT           /* Do nothing.  */
  55 # endif
  56
  57 # define PSEUDO(name, syscall_name, args)                                     \
  58   .globl __syscall_error;                                                     \
  59   ENTRY (name)                                                                \
  60     DO_CALL (syscall_name, args);                                             \
  61     jcc JUMPTARGET(__syscall_error)
  62
  63 # undef PSEUDO_END
  64 # define PSEUDO_END(name)                                                     \
  65   END (name)
  66
  67 # undef JUMPTARGET
  68 # ifdef PIC
  69 #  define JUMPTARGET(name)      name##@PLTPC
  70 # else
  71 #  define JUMPTARGET(name)      name
  72 # endif
  73
  74 #endif  /* __ASSEMBLER__ */