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[doco] Document the XML format used for AIX shared lib support. 

gdb/doc/ChangeLog:

        * gdbint.texinfo (Native Debugging): Add "AIX Shared Library
        Support" subsection documenting the XML format used to transfer
        shared library info on AIX.
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Joel Brobecker 2013-05-08 05:50:47 +00:00
parent 9a005eb9f9
commit 2874cb8393
2 changed files with 77 additions and 0 deletions
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gdb/doc/ChangeLog
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@ -1,3 +1,9 @@
2013-05-08 Joel Brobecker <brobecker@adacore.com>
* gdbint.texinfo (Native Debugging): Add "AIX Shared Library
Support" subsection documenting the XML format used to transfer
shared library info on AIX.
2013-05-08 Joel Brobecker <brobecker@adacore.com>
* gdb.texinfo (Debugging Output): Add documentation of

71
gdb/doc/gdbint.texinfo
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@ -5391,6 +5391,77 @@ the Unix @code{ptrace} call in a vanilla way.
@section shared libraries
@subsection AIX Shared Library Support
Shared library support on AIX is based on reading some data provided
by the loader. With a live process, this information is accessed
via a @code{ptrace} call (@code{PT_LDINFO}), while it is obtained
by reading the @samp{.ldinfo} section when debugging from a core file.
In both cases, the data has the same format, provided by the
@file{sys/ldr.h} system header file.
Internally, the relevant portions of the loader information is
transformed into an XML representation, which lists all objects
currently mapped in memory. The associated DTD can be found in
@file{gdb/features/library-list-aix.dtd}. For each library element,
the following parameters are reported:
@itemize @minus
@item
@code{name}, the path name of an object. This is usually the name
of an archive, or the name of the main executable.
@item
If the @code{name} parameter refers to an archive, @code{member} provides
the name of the object inside the archive on which the program depends.
Otherwise, this field should be omitted.
@item
@code{text_addr}, the address where the @code{.text} section was mapped
in memory.
@item
@code{text_size}, the size of the @code{.text} section.
@item
@code{data_addr}, the address where the @code{.data} section was mapped
in memory.
@item
@code{data_size}, the size of the @code{.data} section.
@end itemize
By convention, the library list always has at least one element, and
the first entry always refers to the main executable.
Below is an example of such XML representation for a small program:
@smallexample
<library-list-aix version="1.0">
<library name="simple"
text_addr="0x0000000010000000"
text_size="128720"
data_addr="0x0000000020000f00"
data_size="31148">
</library>
<library name="/lib/libc.a"
member="shr.o"
text_addr="0x00000000d0100700"
text_size="4152684"
data_addr="0x00000000f0633e50"
data_size="875944">
</library>
</library-list-aix>
@end smallexample
In that example, the list shows that the main executable is named
@file{simple}, and its text section was loaded at 0x10000000.
This program depends on member @file{shr.o} from the @file{/lib/libc.a}
archive, whose text and data sections were loaded at (resp.)
0xd0100700 and 0xf0633e50.
@section Native Conditionals
@cindex native conditionals