ld/scripttempl/ppcpe.sc

   1 # A PE linker script for PowerPC.
   2 # Loosely based on Steve Chamberlain's pe.sc.
   3 # All new mistakes should be credited to Kim Knuttila (krk@cygnus.com)
   4 #
   5 # Copyright (C) 2014-2020 Free Software Foundation, Inc.
   6 #
   7 # Copying and distribution of this file, with or without modification,
   8 # are permitted in any medium without royalty provided the copyright
   9 # notice and this notice are preserved.
  10 #
  11
  12 cat <<EOF
  13 /* Copyright (C) 2014-2020 Free Software Foundation, Inc.
  14
  15    Copying and distribution of this script, with or without modification,
  16    are permitted in any medium without royalty provided the copyright
  17    notice and this notice are preserved.  */
  18
  19 OUTPUT_FORMAT(${OUTPUT_FORMAT})
  20 ${LIB_SEARCH_DIRS}
  21
  22 /* Much of this layout was determined by delving into .exe files for
  23    the box generated by other compilers/linkers/etc. This means that
  24    if a particular feature did not happen to appear in one of the
  25    subject files, then it may not be yet supported.
  26 */
  27
  28 /* It's "mainCRTStartup", not "_mainCRTStartup", and it's located in
  29    one of the two .lib files (libc.lib and kernel32.lib) that currently
  30    must be present on the link line. This means that you must use
  31    "-u mainCRTStartup" to make sure it gets included in the link.
  32 */
  33
  34 ${RELOCATING+ENTRY (mainCRTStartup)}
  35
  36 SECTIONS
  37 {
  38
  39   /* text - the usual meaning */
  40   .text ${RELOCATING+ __image_base__ + __section_alignment__ } :
  41         {
  42             ${RELOCATING+ KEEP (*(SORT_NONE(.init)))}
  43             *(.text)
  44             ${RELOCATING+ *(.text.*)}
  45             *(.gcc_except_table)
  46             ${CONSTRUCTING+ ___CTOR_LIST__ = .; __CTOR_LIST__ = . ;
  47                         LONG (-1); *(.ctors); *(.ctor); LONG (0); }
  48             ${CONSTRUCTING+ ___DTOR_LIST__ = .; __DTOR_LIST__ = . ;
  49                         LONG (-1); *(.dtors); *(.dtor); LONG (0); }
  50             ${RELOCATING+ KEEP (*(SORT_NONE(.fini)))}
  51             ${RELOCATING+ etext = .};
  52         }
  53
  54   /* rdata - Read Only Runtime Data
  55      CTR sections: All of the CRT (read only C runtime data) sections
  56         appear at the start of the .rdata (read only runtime data)
  57         section, in the following order. Don't know if it matters or not.
  58         Not all sections are always present either.
  59      .rdata: compiler generated read only data
  60      .xdata: compiler generated exception handling table. (Most docs
  61         seem to suggest that this section is now deprecated infavor
  62         of the ydata section)
  63      .edata: The exported names table.
  64   */
  65   .rdata BLOCK(__section_alignment__) :
  66         {
  67             *(.CRT\$XCA);
  68             *(.CRT\$XCC);
  69             *(.CRT\$XCZ);
  70             *(.CRT\$XIA);
  71             *(.CRT\$XIC);
  72             *(.CRT\$XIZ);
  73             *(.CRT\$XLA);
  74             *(.CRT\$XLZ);
  75             *(.CRT\$XPA);
  76             *(.CRT\$XPX);
  77             *(.CRT\$XPZ);
  78             *(.CRT\$XTA);
  79             *(.CRT\$XTZ);
  80             *(.rdata);
  81             *(.xdata);
  82         }
  83
  84   .edata BLOCK(__section_alignment__) :
  85         {
  86             *(.edata);
  87         }
  88
  89   /* data - initialized data
  90      .ydata: exception handling information.
  91      .data: the usual meaning.
  92      .data2: more of the same.
  93      .bss: For some reason, bss appears to be included in the data
  94         section, as opposed to being given a section of it's own.
  95      COMMON:
  96   */
  97   .data BLOCK(__section_alignment__) :
  98         {
  99             __data_start__ = . ;
 100             *(.ydata);
 101             *(.data);
 102             *(.data2);
 103             __bss_start__ = . ;
 104             *(.bss) ;
 105             *(COMMON);
 106             __bss_end__ = . ;
 107             ${RELOCATING+ end =  .};
 108             __data_end__ = . ;
 109         }
 110
 111   /* The exception handling table. A sequence of 5 word entries. Section
 112      address and extent are placed in the DataDirectory.
 113   */
 114   .pdata BLOCK(__section_alignment__) :
 115         {
 116             *(.pdata)
 117             ;
 118         }
 119
 120   /* The idata section is chock full of magic bits.
 121         1. Boundaries around various idata parts are used to initialize
 122            some of the fields of the DataDirectory. In particular, the
 123            magic for 2, 4 and 5 are known to be used. Some compilers
 124            appear to generate magic section symbols for this purpose.
 125            Where we can, we catch such symbols and use our own. This of
 126            course is something less than a perfect strategy.
 127         2. The table of contents is placed immediately after idata4.
 128            The ".private.toc" sections are generated by the ppc bfd. The
 129            .toc variable is generated by gas, and resolved here. It is
 130            used to initialized function descriptors (and anyone else who
 131            needs the address of the module's toc). The only thing
 132            interesting about it at all? Most ppc instructions using it
 133            have a 16bit displacement field. The convention for addressing
 134            is to initialize the .toc value to 32K past the start of the
 135            actual toc, and subtract 32K from all references, thus using
 136            the entire 64K range. Naturally, the reloc code must agree
 137            on this number or you get pretty stupid results.
 138   */
 139   .idata BLOCK(__section_alignment__) :
 140         {
 141             __idata2_magic__ = .;
 142             *(.idata\$2);
 143             __idata3_magic__ = .;
 144             *(.idata\$3);
 145             __idata4_magic__ = .;
 146             *(.idata\$4);
 147             . = ALIGN(4);
 148             .toc = . + 32768;
 149             *(.private.toc);
 150             __idata5_magic__ = .;
 151             *(.idata\$5);
 152             __idata6_magic__ = .;
 153             *(.idata\$6);
 154             __idata7_magic__ = .;
 155             *(.idata\$7);
 156             ;
 157         }
 158
 159   /* reldata -- data that requires relocation
 160   */
 161   .reldata BLOCK(__section_alignment__) :
 162         {
 163             *(.reldata)
 164             ;
 165         }
 166
 167
 168   /* Resources */
 169   .rsrc BLOCK(__section_alignment__) :
 170         {
 171             *(.rsrc\$01)
 172             *(.rsrc\$02)
 173             ;
 174         }
 175
 176   .stab BLOCK(__section_alignment__)  ${RELOCATING+(NOLOAD)} :
 177   {
 178     [ .stab ]
 179   }
 180
 181   .stabstr BLOCK(__section_alignment__) ${RELOCATING+(NOLOAD)} :
 182   {
 183     [ .stabstr ]
 184   }
 185
 186   /* The .reloc section is currently generated by the dlltool from Steve
 187      Chamberlain in a second pass of linking. Section address and extent
 188      are placed in the DataDirectory.
 189   */
 190   .reloc BLOCK(__section_alignment__) :
 191         {
 192             *(.reloc)
 193             ;
 194         }
 195
 196   /* We don't do anything useful with codeview debugger support or the
 197      directive section (yet). Hopefully, we junk them correctly.
 198   */
 199   /DISCARD/ BLOCK(__section_alignment__) :
 200         {
 201             *(.debug\$S)
 202             *(.debug\$T)
 203             *(.debug\$F)
 204             *(.drectve)
 205             ;
 206         }
 207 }
 208 EOF