lib/csu/sh3_elf/dot_init.h

   1 /*      $NetBSD: dot_init.h,v 1.7 2008/05/10 15:31:04 martin Exp $      */
   2
   3 /*-
   4  * Copyright (c) 2001 Ross Harvey
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the NetBSD
  18  *      Foundation, Inc. and its contributors.
  19  * 4. Neither the name of The NetBSD Foundation nor the names of its
  20  *    contributors may be used to endorse or promote products derived
  21  *    from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  37
  38
  39 /*
  40  * Don't use C versions of _init/_fini, they have become just a
  41  * rudimentary indirection to the entry points we would supply with
  42  * MD_SECTION_PROLOGUE.
  43  */
  44 #define MD_INIT_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.init, _init)
  45 #define MD_FINI_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.fini, _fini)
  46
  47 #define MD_INIT_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.init)
  48 #define MD_FINI_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.fini)
  49
  50
  51 #define MD_ASM_IN_SECTION(section, content)                             \
  52         __asm(                                                          \
  53                 ".section " #section ",\"ax\",@progbits\n"              \
  54                         content "\n"                                    \
  55                 ".previous")
  56
  57 /*
  58  * Declare the entry point global.
  59  */
  60 #define MD_SECTION_PROLOGUE(section, entry_pt)                          \
  61         MD_ASM_IN_SECTION(section,                                      \
  62                 "       .global "_C_LABEL_STRING(#entry_pt)"    \n"     \
  63                 "       .type "_C_LABEL_STRING(#entry_pt)",@function\n" \
  64                 _C_LABEL_STRING(#entry_pt)":                    \n"     \
  65                 "       mov.l   r14, @-sp                       \n"     \
  66                 "       sts.l   pr, @-sp                        \n"     \
  67                 "       mov     sp, r14                         \n"     \
  68                 "       .p2align 2")
  69
  70 /*
  71  * NOTE 1: Supply the semicolon here because crtbegin.c doesn't.
  72  * NOTE 2: We don't use our crtbegin.c for gcc3 and later,
  73  *         we use gcc crtstuff.c via src/gnu/lib/crtstuff*
  74  */
  75 #define MD_CALL_STATIC_FUNCTION(section, func)                          \
  76         MD_ASM_IN_SECTION(section,                                      \
  77                 "       mov.l   1f, r1                          \n"     \
  78                 "       mova    2f, r0                          \n"     \
  79                 "0:     braf    r1                              \n"     \
  80                 "        lds    r0, pr                          \n"     \
  81                                                                         \
  82                 "       .p2align 2                              \n"     \
  83                 "1:     .long "_C_LABEL_STRING(#func)" - (0b+4) \n"     \
  84                 "2:     ");
  85
  86 #define MD_SECTION_EPILOGUE(section)                                    \
  87         MD_ASM_IN_SECTION(section,                                      \
  88                 "       mov     r14, sp                         \n"     \
  89                 "       lds.l   @sp+, pr                        \n"     \
  90                 "       rts                                     \n"     \
  91                 "        mov.l  @sp+, r14")