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Olaf Bachmann <obachman@mathematik.uni-kl.de>
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<TITLE>GDB Internals: Support Libraries</TITLE>
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<A NAME="SEC102"></A>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_11.html#SEC101"> < </A>]</TD>
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<H1> 12. Support Libraries </H1>
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<!--docid::SEC102::-->
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<P>
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<HR SIZE="6">
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<A NAME="SEC103"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC102"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_toc.html#SEC_Contents">Contents</A>]</TD>
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</TR></TABLE>
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<H2> 12.1 BFD </H2>
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<!--docid::SEC103::-->
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<P>
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BFD provides support for GDB in several ways:
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</P><P>
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<DL COMPACT>
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<DT><EM>identifying executable and core files</EM>
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<DD>BFD will identify a variety of file types, including a.out, coff, and
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several variants thereof, as well as several kinds of core files.
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<P>
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<DT><EM>access to sections of files</EM>
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<DD>BFD parses the file headers to determine the names, virtual addresses,
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sizes, and file locations of all the various named sections in files
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(such as the text section or the data section). GDB simply
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calls BFD to read or write section <VAR>x</VAR> at byte offset <VAR>y</VAR> for
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length <VAR>z</VAR>.
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<P>
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<DT><EM>specialized core file support</EM>
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<DD>BFD provides routines to determine the failing command name stored in a
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core file, the signal with which the program failed, and whether a core
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file matches (i.e. could be a core dump of) a particular executable
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file.
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<P>
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<DT><EM>locating the symbol information</EM>
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<DD>GDB uses an internal interface of BFD to determine where to find the
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symbol information in an executable file or symbol-file. GDB itself
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handles the reading of symbols, since BFD does not "understand" debug
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symbols, but GDB uses BFD's cached information to find the symbols,
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string table, etc.
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</DL>
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<P>
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<HR SIZE="6">
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<A NAME="SEC104"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC105"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> 12.2 opcodes </H2>
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<!--docid::SEC104::-->
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<P>
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The opcodes library provides GDB's disassembler. (It's a separate
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library because it's also used in binutils, for <TT>`objdump'</TT>).
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</P><P>
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<HR SIZE="6">
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<A NAME="SEC105"></A>
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</TR></TABLE>
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<H2> 12.3 readline </H2>
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<!--docid::SEC105::-->
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<P>
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<HR SIZE="6">
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<A NAME="SEC106"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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</TR></TABLE>
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<H2> 12.4 mmalloc </H2>
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<!--docid::SEC106::-->
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<P>
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<HR SIZE="6">
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<A NAME="SEC107"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC106"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC108"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC102"> Up </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_13.html#SEC110"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_toc.html#SEC_Contents">Contents</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_19.html#SEC186">Index</A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_abt.html#SEC_About"> ? </A>]</TD>
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</TR></TABLE>
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<H2> 12.5 libiberty </H2>
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<!--docid::SEC107::-->
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<P>
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<HR SIZE="6">
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<A NAME="SEC108"></A>
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC107"> < </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC109"> > </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT"> <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC109"> << </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_12.html#SEC102"> Up </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_13.html#SEC110"> >> </A>]</TD>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_toc.html#SEC_Contents">Contents</A>]</TD>
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</TR></TABLE>
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<H2> 12.6 gnu-regex </H2>
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<!--docid::SEC108::-->
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<P>
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Regex conditionals.
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</P><P>
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<DL COMPACT>
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<DT><CODE>C_ALLOCA</CODE>
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<DD><P>
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<DT><CODE>NFAILURES</CODE>
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<DD><P>
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<DT><CODE>RE_NREGS</CODE>
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<DD><P>
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<DT><CODE>SIGN_EXTEND_CHAR</CODE>
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<DD><P>
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<DT><CODE>SWITCH_ENUM_BUG</CODE>
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<DD><P>
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<DT><CODE>SYNTAX_TABLE</CODE>
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<DD><P>
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<DT><CODE>Sword</CODE>
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<DD><P>
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<DT><CODE>sparc</CODE>
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<DD></DL>
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<P>
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<HR SIZE="6">
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<A NAME="SEC109"></A>
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<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="gdbint_toc.html#SEC_Contents">Contents</A>]</TD>
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</TR></TABLE>
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<H2> 12.7 include </H2>
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<!--docid::SEC109::-->
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<P>
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<A NAME="Coding"></A>
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</P><P>
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<HR SIZE="6">
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<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
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<BR>
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<FONT SIZE="-1">
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<address>
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<p>Please send FSF & GNU inquiries & questions to <a
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href="mailto:gnu@gnu.org">gnu@gnu.org</a>. There are also <a
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href="http://www.gnu.org/home.html#ContactInfo">other ways to
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contact</a> the FSF.</p>
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<p>These pages are maintained by <a
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href="http://www.gnu.org/software/gdb/">the GDB developers</a>.</p>
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<p>Copyright Free Software Foundation, Inc., 59 Temple Place - Suite
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330, Boston, MA 02111, USA.</p>
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<p>Verbatim copying and distribution of this entire article is
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permitted in any medium, provided this notice is preserved.</p>
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</address>
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This document was generated
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by <I>GDB Administrator</I> on <I>October, 18 2002</I>
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using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html
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