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[RFA/doco] Document the XML format used for AIX shared lib support.
- From: Joel Brobecker <brobecker at adacore dot com>
- To: gdb-patches at sourceware dot org
- Date: Tue, 7 May 2013 14:13:26 +0400
- Subject: [RFA/doco] Document the XML format used for AIX shared lib support.
Hello,
Noticed by Pedro - new formats should all be documented. This adds
documentation for the XML format used to transfer the shared library
info between the native side to the target-only side. I've placed
that information in gdbint, since this is currently purely internal,
and therefore of little interest to the average user ready the GDB
Manual.
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.
Tested by rebuilding the documentation on x86_64-linux. OK to commit?
Thank you,
--
Joel
---
gdb/doc/gdbint.texinfo | 68 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
diff --git a/gdb/doc/gdbint.texinfo b/gdb/doc/gdbint.texinfo
index 9bdbe74..228e279 100644
--- a/gdb/doc/gdbint.texinfo
+++ b/gdb/doc/gdbint.texinfo
@@ -5391,6 +5391,74 @@ 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 ".ldinfo" section when debugging from a core file.
+In both cases, the data has the same format, provided by @file{<sys/ldr.h>}.
+
+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 .text section was mapped in memory.
+
+@item
+@code{text_size}, the size of the .text section.
+
+@item
+@code{data_addr}, the address where the .data section was mapped in memory.
+
+@item
+@code{data_size}, the size of the .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
--
1.7.10.4