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Re: Q: debugging linker scripts


On Thu, 2009-11-19 at 22:34 +1030, Alan Modra wrote:
> On Thu, Nov 19, 2009 at 12:08:05PM +0100, Danny Backx wrote:
> >   4 .debug_info   00000282  00000000  00000000  00000320  2**0
> >                   CONTENTS, RELOC, READONLY, DEBUGGING
> 
> That looks OK to me.  Do you mention .debug_info in your script?  How
> about file specs other than "*" than might match crt3.o?

The ld/scripttempl/pe.sc is a modified version from the binutils
sources, and it contains debug_info but just in the same places as the
original version. See attachment.

This is what you're referring to, isn't it ?

Most of the diffs are work from Kai, I also moved the BSS into the .data
segment (instead of generating a .bss segment for this). This appears to
make a difference for Windows Mobile 6.1 .

	Danny
-- 
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
# Linker script for PE.

if test -z "${RELOCATEABLE_OUTPUT_FORMAT}"; then
  RELOCATEABLE_OUTPUT_FORMAT=${OUTPUT_FORMAT}
fi

# We can't easily and portably get an unquoted $ in a shell
# substitution, so we do this instead.
# Sorting of the .foo$* sections is required by the definition of
# grouped sections in PE.
# Sorting of the file names in R_IDATA is required by the
# current implementation of dlltool (this could probably be changed to
# use grouped sections instead).
if test "${RELOCATING}"; then
  R_TEXT='*(SORT(.text$*))'
  if test "x$LD_FLAG" = "xauto_import" ; then
    R_DATA='*(SORT(.data$*))
            *(.rdata)
	    *(SORT(.rdata$*))'
    R_RDATA=''
  else
    R_DATA='*(SORT(.data$*))'
    R_RDATA='*(.rdata)
             *(SORT(.rdata$*))'
  fi
  R_IDATA234='
    SORT(*)(.idata$2)
    SORT(*)(.idata$3)
    /* These zeroes mark the end of the import list.  */
    LONG (0); LONG (0); LONG (0); LONG (0); LONG (0);
    SORT(*)(.idata$4)'
  R_IDATA5='SORT(*)(.idata$5)'
  R_IDATA67='
    SORT(*)(.idata$6)
    SORT(*)(.idata$7)'
  R_CRT_XC='*(SORT(.CRT$XC*))  /* C initialization */'
  R_CRT_XI='*(SORT(.CRT$XI*))  /* C++ initialization */'
  R_CRT_XL='*(SORT(.CRT$XL*))  /* TLS callbacks */'
  R_CRT_XP='*(SORT(.CRT$XP*))  /* Pre-termination */'
  R_CRT_XT='*(SORT(.CRT$XT*))  /* Termination */'
  R_TLS='
    *(.tls)
    *(.tls$)
    *(SORT(.tls$*))'
  R_RSRC='*(SORT(.rsrc$*))'
else
  R_TEXT=
  R_DATA=
  R_RDATA='*(.rdata)'
  R_IDATA234=
  R_IDATA5=
  R_IDATA67=
  R_CRT=
  R_RSRC=
fi

cat <<EOF
${RELOCATING+OUTPUT_FORMAT(${OUTPUT_FORMAT})}
${RELOCATING-OUTPUT_FORMAT(${RELOCATEABLE_OUTPUT_FORMAT})}
${OUTPUT_ARCH+OUTPUT_ARCH(${OUTPUT_ARCH})}

${LIB_SEARCH_DIRS}

SECTIONS
{
  ${RELOCATING+/* Make the virtual address and file offset synced if the alignment is}
  ${RELOCATING+   lower than the target page size. */}
  ${RELOCATING+/* Yow pe.sc */}
  ${RELOCATING+. = SIZEOF_HEADERS;}
  ${RELOCATING+. = ALIGN(__section_alignment__);}
  .text ${RELOCATING+ __image_base__ + ( __section_alignment__ < ${TARGET_PAGE_SIZE} ? . : __section_alignment__ )} : 
  {
    ${RELOCATING+ *(.init)}
    *(.text)
    ${R_TEXT}
    ${RELOCATING+ *(.text.*)}
    *(.glue_7t)
    *(.glue_7)
    ${CONSTRUCTING+ ___CTOR_LIST__ = .; __CTOR_LIST__ = . ; 
			LONG (-1);*(.ctors); *(.ctor); *(SORT(.ctors.*));  LONG (0); }
    ${CONSTRUCTING+ ___DTOR_LIST__ = .; __DTOR_LIST__ = . ; 
			LONG (-1); *(.dtors); *(.dtor); *(SORT(.dtors.*));  LONG (0); }
    ${RELOCATING+ *(.fini)}
    /* ??? Why is .gcc_exc here?  */
    ${RELOCATING+ *(.gcc_exc)}
    ${RELOCATING+PROVIDE (etext = .);}
    ${RELOCATING+ *(.gcc_except_table)}
  }

  /* The Cygwin32 library uses a section to avoid copying certain data
     on fork.  This used to be named ".data$nocopy".  The linker used
     to include this between __data_start__ and __data_end__, but that
     breaks building the cygwin32 dll.  Instead, we name the section
     ".data_cygwin_nocopy" and explictly include it after __data_end__. */

  .data ${RELOCATING+BLOCK(__section_alignment__)} : 
  {
    ${RELOCATING+__data_start__ = . ;}
    *(.data)
    *(.data2)
    ${R_DATA}
    *(.jcr)
    ${RELOCATING+__data_end__ = . ;}
    ${RELOCATING+*(.data_cygwin_nocopy)}

  /* Stuff copied from BSS */
    ${RELOCATING+__bss_start__ = . ;}
    *(.bss)
    *(COMMON)
    ${RELOCATING+__bss_end__ = . ;}
  /* End stuff from BSS */
  }

  .rdata ${RELOCATING+BLOCK(__section_alignment__)} :
  {
    ${R_RDATA}
    ${RELOCATING+___RUNTIME_PSEUDO_RELOC_LIST__ = .;}
    ${RELOCATING+__RUNTIME_PSEUDO_RELOC_LIST__ = .;}
    *(.rdata_runtime_pseudo_reloc)
    ${RELOCATING+___RUNTIME_PSEUDO_RELOC_LIST_END__ = .;}
    ${RELOCATING+__RUNTIME_PSEUDO_RELOC_LIST_END__ = .;}

  /* Moved .edata */
  /* End moved .edata */

  /* Moved .idata */
	/* Moving idata appears to cause a crash even in d2.exe */
  /* End moved .idata */
  }

  .eh_frame ${RELOCATING+BLOCK(__section_alignment__)} :
  {
    *(.eh_frame)
  }

  .pdata ${RELOCATING+BLOCK(__section_alignment__)} :
  {
    *(.pdata)
  }

  .edata ${RELOCATING+BLOCK(__section_alignment__)} :
  {
    *(.edata)
  }

  /DISCARD/ :
  {
    *(.debug\$S)
    *(.debug\$T)
    *(.debug\$F)
    *(.drectve)
  }

  .idata ${RELOCATING+BLOCK(__section_alignment__)} :
  {
    /* This cannot currently be handled with grouped sections.
	See pe.em:sort_sections.  */
    ${R_IDATA234}
    ${RELOCATING+__idata5_start__ = .;}
    ${R_IDATA5}
    ${RELOCATING+__idata5_end__ = .;}
    ${R_IDATA67}
  }

  .CRT ${RELOCATING+BLOCK(__section_alignment__)} :
  { 					
    ${RELOCATING+___crt_xc_start__ = . ;}
    ${R_CRT_XC}
    ${RELOCATING+___crt_xc_end__ = . ;}
    ${RELOCATING+___crt_xi_start__ = . ;}
    ${R_CRT_XI}
    ${RELOCATING+___crt_xi_end__ = . ;}
    ${RELOCATING+___crt_xl_start__ = . ;}
    ${R_CRT_XL}
    /* ___crt_xl_end__ is defined in the TLS Directory support code */
    ${RELOCATING+___crt_xp_start__ = . ;}
    ${R_CRT_XP}
    ${RELOCATING+___crt_xp_end__ = . ;}
    ${RELOCATING+___crt_xt_start__ = . ;}
    ${R_CRT_XT}
    ${RELOCATING+___crt_xt_end__ = . ;}
  }

  .tls ${RELOCATING+BLOCK(__section_alignment__)} :
  { 					
    ${RELOCATING+___tls_start__ = . ;}
    ${R_TLS}
    ${RELOCATING+___tls_end__ = . ;}
  }

  .endjunk ${RELOCATING+BLOCK(__section_alignment__)} :
  {
    /* end is deprecated, don't use it */
    ${RELOCATING+PROVIDE (end = .);}
    ${RELOCATING+PROVIDE ( _end = .);}
    ${RELOCATING+ __end__ = .;}
  }

  .rsrc ${RELOCATING+BLOCK(__section_alignment__)} :
  { 					
    *(.rsrc)
    ${R_RSRC}
  }

  .reloc ${RELOCATING+BLOCK(__section_alignment__)} :
  { 					
    *(.reloc)
  }

  .stab ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.stab)
  }

  .stabstr ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.stabstr)
  }

  /* DWARF debug sections.
     Symbols in the DWARF debugging sections are relative to the beginning
     of the section.  Unlike other targets that fake this by putting the
     section VMA at 0, the PE format will not allow it.  */
     
  /* DWARF 1.1 and DWARF 2.  */
  .debug_aranges ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_aranges)
  }

  .debug_pubnames ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_pubnames)
  }

  .debug_pubtypes ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_pubtypes)
  }

  /* DWARF 2.  */
  .debug_info ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_info) *(.gnu.linkonce.wi.*)
  }

  .debug_abbrev ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_abbrev)
  }

  .debug_line ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_line)
  }

  .debug_frame ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_frame)
  }

  .debug_str ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_str)
  }

  .debug_loc ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_loc)
  }

  .debug_macinfo ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_macinfo)
  }

  /* SGI/MIPS DWARF 2 extensions.  */
  .debug_weaknames ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_weaknames)
  }

  .debug_funcnames ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_funcnames)
  }

  .debug_typenames ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_typenames)
  }

  .debug_varnames ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_varnames)
  }

  /* DWARF 3.  */
  .debug_ranges ${RELOCATING+BLOCK(__section_alignment__)} ${RELOCATING+(NOLOAD)} :
  {
    *(.debug_ranges)
  }
}
EOF

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