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Expose .edata section

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Kim Knuttila
1995-11-30 18:18:38 +00:00
parent 781332facb
commit d611a82e67
2 changed files with 200 additions and 0 deletions
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5
ld/ChangeLog
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Thu Nov 30 13:14:30 1995 Kim Knuttila <krk@cygnus.com>
* scripttempl/ppcpe.sc: Moved .edata into its own section to
expose it.
Thu Nov 30 11:32:34 1995 Manfred Hollstein KS/EF4A 60/1F/110 #40283 <manfred@lts.sel.alcatel.de>
* configure.host (m68*-motorola-sysv): Define HOSTING_CRT0 and

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ld/scripttempl/ppcpe.sc Normal file
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# A PE linker script for PowerPC.
# Loosely based on Steve Chamberlain's pe.sc.
# All new mistakes should be credited to Kim Knuttila (krk@cygnus.com)
#
# These are substituted in as variables in order to get '}' in a shell
# conditional expansion.
INIT='.init : { *(.init) }'
FINI='.fini : { *(.fini) }'
cat <<EOF
OUTPUT_FORMAT(${OUTPUT_FORMAT})
${LIB_SEARCH_DIRS}
/* Much of this layout was determined by delving into .exe files for
the box generated by other compilers/linkers/etc. This means that
if a particular feature did not happen to appear in one of the
subject files, then it may not be yet supported.
*/
/* It's "mainCRTStartup", not "_mainCRTStartup", and it's located in
one of the two .lib files (libc.lib and kernel32.lib) that currently
must be present on the link line. This means that you must use
"-u mainCRTStartup" to make sure it gets included in the link.
*/
ENTRY(mainCRTStartup)
SECTIONS
{
/* text - the usual meaning */
.text ${RELOCATING+ __image_base__ + __section_alignment__ } :
{
${RELOCATING+ *(.init);}
*(.text)
${CONSTRUCTING+ ___CTOR_LIST__ = .; __CTOR_LIST__ = . ;
LONG (-1); *(.ctors); *(.ctor); LONG (0); }
${CONSTRUCTING+ ___DTOR_LIST__ = .; __DTOR_LIST__ = . ;
LONG (-1); *(.dtors); *(.dtor); LONG (0); }
${RELOCATING+ *(.fini);}
${RELOCATING+ etext = .};
}
/* rdata - Read Only Runtime Data
CTR sections: All of the CRT (read only C runtime data) sections
appear at the start of the .rdata (read only runtime data)
section, in the following order. Don't know if it matters or not.
Not all sections are always present either.
.rdata: compiler generated read only data
.xdata: compiler generated exception handling table. (Most docs
seem to suggest that this section is now deprecated infavor
of the ydata section)
.edata: The exported names table.
*/
.rdata BLOCK(__section_alignment__) :
{
*(.CRT\$XCA);
*(.CRT\$XCC);
*(.CRT\$XCZ);
*(.CRT\$XIA);
*(.CRT\$XIC);
*(.CRT\$XIZ);
*(.CRT\$XLA);
*(.CRT\$XLZ);
*(.CRT\$XPA);
*(.CRT\$XPX);
*(.CRT\$XPZ);
*(.CRT\$XTA);
*(.CRT\$XTZ);
*(.rdata);
*(.xdata);
}
.edata BLOCK(__section_alignment__) :
{
*(.edata);
}
/* data - initialized data
.ydata: exception handling information.
.data: the usual meaning.
.data2: more of the same.
.bss: For some reason, bss appears to be included in the data
section, as opposed to being given a section of it's own.
COMMON:
*/
.data BLOCK(__section_alignment__) :
{
__data_start__ = . ;
*(.ydata);
*(.data);
*(.data2);
__bss_start__ = . ;
*(.bss) ;
*(COMMON);
__bss_end__ = . ;
${RELOCATING+ end = .};
__data_end__ = . ;
}
/* The exception handling table. A sequence of 5 word entries. Section
address and extent are placed in the DataDirectory.
*/
.pdata BLOCK(__section_alignment__) :
{
*(.pdata)
;
}
/* The idata section is chock full of magic bits.
1. Boundaries around various idata parts are used to initialize
some of the fields of the DataDirectory. In particular, the
magic for 2, 4 and 5 are known to be used. Some compilers
appear to generate magic section symbols for this purpose.
Where we can, we catch such symbols and use our own. This of
course is something less than a perfect strategy.
2. The table of contents is placed immediately after idata4.
The ".private.toc" sections are generated by the ppc bfd. The
.toc variable is generated by gas, and resolved here. It is
used to initialized function descriptors (and anyone else who
needs the address of the module's toc). The only thing
interesting about it at all? Most ppc instructions using it
have a 16bit displacement field. The convention for addressing
is to initialize the .toc value to 32K past the start of the
actual toc, and subtract 32K from all references, thus using
the entire 64K range. Naturally, the reloc code must agree
on this number or you get pretty stupid results.
*/
.idata BLOCK(__section_alignment__) :
{
__idata2_magic__ = .;
*(.idata\$2);
__idata3_magic__ = .;
*(.idata\$3);
__idata4_magic__ = .;
*(.idata\$4);
.toc = . + 32768;
*(.private.toc);
__idata5_magic__ = .;
*(.idata\$5);
__idata6_magic__ = .;
*(.idata\$6);
__idata7_magic__ = .;
*(.idata\$7);
;
}
/* reldata -- data that requires relocation
*/
.reldata BLOCK(__section_alignment__) :
{
*(.reldata)
;
}
/* We don't do anything useful with codeview debugger support or the
directive section (yet). Hopefully, we junk them correctly.
*/
.junk BLOCK(__section_alignment__) :
{
*(.debug\$S)
*(.debug\$T)
*(.debug\$F)
*(.drectve)
;
}
/* Resources */
.rsrc BLOCK(__section_alignment__) :
{
*(.rsrc\$01)
*(.rsrc\$02)
;
}
/* The .reloc section is currently generated by the dlltool from Steve
Chamberlain in a second pass of linking. Section address and extent
are placed in the DataDirectory.
*/
.reloc BLOCK(__section_alignment__) :
{
*(.reloc)
;
}
.stab BLOCK(__section_alignment__) ${RELOCATING+(NOLOAD)} :
{
[ .stab ]
}
.stabstr BLOCK(__section_alignment__) ${RELOCATING+(NOLOAD)} :
{
[ .stabstr ]
}
}
EOF