sysdeps/csky/sysdep.h

   1 /* Assembler macros for C-SKY.
   2    Copyright (C) 2018-2020 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 #include <features.h>
  21
  22 #ifdef __ASSEMBLER__
  23
  24 # define ASM_SIZE_DIRECTIVE(name) .size name,.-name
  25
  26 /* Define an entry point visible from C.  */
  27 # define ENTRY(name)            \
  28         .globl name;            \
  29         .type name,@function;   \
  30         .align 4;               \
  31         name##:;                \
  32         cfi_startproc;          \
  33         CALL_MCOUNT
  34
  35 # undef  END
  36 # define END(name)              \
  37         cfi_endproc;            \
  38         ASM_SIZE_DIRECTIVE(name)
  39
  40 /* If compiled for profiling, call `mcount' at the start of each function.  */
  41 # ifdef PROF
  42 #  ifdef __PIC__
  43 #   define CALL_MCOUNT                          \
  44         subi    sp, 4;                          \
  45         stw     lr, (sp, 0);                    \
  46         grs     t0, .Lgetpc;                    \
  47 .Lgetpc:                                        \
  48         lrw     gb, .Lgetpc@GOTPC;              \
  49         addu    gb, t0;                         \
  50         lrw     t1, _mcount@PLT;                \
  51         ldr.w   t0, (gb, t1 << 0);              \
  52         jmp     t0;
  53 #  else
  54 #   define CALL_MCOUNT                          \
  55         subi    sp, 4;                          \
  56         stw     lr, (sp, 0);                    \
  57         jbsr    _mcount;
  58 #  endif
  59 # else
  60 #  define CALL_MCOUNT   /* Do nothing.  */
  61 # endif
  62
  63 # if defined (__CK860__)
  64 /* Instruction fetch will be faster when the label is 16 bytes aligned.
  65    Filling with nop instruction to avoid extra jump.  */
  66 #  define LABLE_ALIGN   \
  67         .balignw 16, 0x6c03
  68
  69 #  define PRE_BNEZAD(R)
  70
  71 #  define BNEZAD(R, L)  \
  72         bnezad  R, L
  73 # else
  74 #  define LABLE_ALIGN   \
  75         .balignw 8, 0x6c03
  76
  77 #  define PRE_BNEZAD(R) \
  78         subi    R, 1
  79
  80 #  define BNEZAD(R, L)  \
  81         bnez    R, L
  82 # endif
  83
  84 #endif