lib/csu/mips/dot_init.h

   1 /* $NetBSD: dot_init.h,v 1.10 2009/12/14 01:04:02 matt Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2001 Ross Harvey
   5  * Copyright (c) 2001 Simon Burge
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the NetBSD
  19  *      Foundation, Inc. and its contributors.
  20  * 4. Neither the name of The NetBSD Foundation nor the names of its
  21  *    contributors may be used to endorse or promote products derived
  22  *    from this software without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  25  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  26  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  28  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */
  38
  39 #define t9      "$25"
  40
  41 /*
  42  * For O32/O64, allocate 8 "slots" for the stack frame.  Store GP in the 4th
  43  * (zero-based) slot (since this is where compiler generated code for fallthru
  44  * processing expects it to be), and the RA in seventh (highest address).
  45  *
  46  * For N32/N64, allocate 4 8-byte "slots" for the stack frame.  Store GP in the
  47  * 2nd (zero-based) slot (since ...) and the RA in third (highest address).
  48  */
  49
  50 #ifdef __mips_o32
  51 #define sPTR_ADDU               "addu"
  52 #define sREG_L                  "lw"
  53 #define sREG_S                  "sw"
  54 #define sRAOFF                  "28"
  55 #define sFRAMESZ                "32"
  56 #define MD_GPRESTORE            /* nothing */
  57 #else
  58 #define sPTR_ADDU               "daddu"
  59 #define sREG_L                  "ld"
  60 #define sREG_S                  "sd"
  61 #if defined(__mips_n32) || defined(__mips_n64)
  62 #define MD_GPRESTORE            "ld     $gp,8($sp)"             "\n\t"
  63 #define sRAOFF                  "24"
  64 #define sFRAMESZ                "32"
  65 #elif defined(__mips_o64)
  66 #define sRAOFF                  "56"
  67 #define sFRAMESZ                "64"
  68 #define MD_GPRESTORE            /* nothing */
  69 #endif
  70 #endif
  71
  72 #ifdef __ABICALLS__
  73 #if defined(__mips_o32) || defined(__mips_o64)
  74 #define MD_FUNCTION_PROLOGUE(entry_pt)                                  \
  75                 ".set   noreorder"                              "\n\t"  \
  76                 ".cpload "t9                                    "\n\t"  \
  77                 ".set   reorder"                                "\n\t"  \
  78                 sPTR_ADDU"      $sp,$sp,-"sFRAMESZ              "\n\t"  \
  79                 ".cprestore 16"                                 "\n\t"  \
  80                 sREG_S" $ra,"sRAOFF"($sp)"                      "\n\t"
  81
  82 #elif defined(__mips_n32) || defined(__mips_n64)
  83 #define MD_FUNCTION_PROLOGUE(entry_pt)                                  \
  84                 ".set   noreorder"                              "\n\t"  \
  85                 "daddu  $sp,$sp,-32"                            "\n\t"  \
  86                 ".cpsetup "t9", 8, "#entry_pt                   "\n\t"  \
  87                 "sd     $ra,24($sp)"                            "\n\t"  \
  88                 ".set   reorder"                                "\n\t"
  89 #else
  90 #error ABI not supported (__ABICALLS)
  91 #endif
  92 #else
  93 #if defined(__mips_o32) || defined(__mips_o64)
  94 #define MD_FUNCTION_PROLOGUE(entry_pt)                                  \
  95                 sPTR_ADDU"      $sp,$sp,-"sFRAMESZ              "\n\t"  \
  96                 sREG_S" $ra,"sRAOFF"($sp)"                      "\n\t"
  97
  98 #elif defined(__mips_n32) || defined(__mips_n64)
  99 /*
 100  * On N32/N64, GP is callee-saved.
 101  */
 102 #define MD_FUNCTION_PROLOGUE(entry_pt)                                  \
 103                 "daddu  $sp,$sp,-32"                            "\n\t"  \
 104                 "sd     $gp,8($sp)"                             "\n\t"  \
 105                 "sd     $ra,24($sp)"                            "\n\t"
 106 #else
 107 #error ABI not supported (!__ABICALLS)
 108 #endif
 109 #endif /* __ABICALLS */
 110
 111
 112 #define MD_SECTION_PROLOGUE(sect, entry_pt)                             \
 113                 __asm (                                                 \
 114                 ".section "#sect",\"ax\",@progbits"             "\n\t"  \
 115                 ".align 2"                                      "\n\t"  \
 116                 ".globl "#entry_pt                              "\n\t"  \
 117                 #entry_pt":"                                    "\n\t"  \
 118                 MD_FUNCTION_PROLOGUE(entry_pt)                          \
 119                 "       /* fall thru */"                        "\n\t"  \
 120                 ".previous")
 121
 122 #define MD_SECTION_EPILOGUE(sect)                                       \
 123                 __asm (                                                 \
 124                 ".section "#sect",\"ax\",@progbits"             "\n\t"  \
 125                 sREG_L" $ra,"sRAOFF"($sp)"                      "\n\t"  \
 126                 MD_GPRESTORE                                            \
 127                 ".set   noreorder"                              "\n\t"  \
 128                 "j      $ra"                                    "\n\t"  \
 129                 sPTR_ADDU"      $sp,$sp,"sFRAMESZ               "\n\t"  \
 130                 ".set   reorder"                                "\n\t"  \
 131                 ".previous")
 132
 133 #define MD_INIT_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.init, _init)
 134 #define MD_FINI_SECTION_PROLOGUE MD_SECTION_PROLOGUE(.fini, _fini)
 135
 136 #define MD_INIT_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.init)
 137 #define MD_FINI_SECTION_EPILOGUE MD_SECTION_EPILOGUE(.fini)