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[Bug symtab/13173] New: add-symbol-file -s option still requirestext address
- From: "konrad.schwarz at siemens dot com"<sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Fri, 09 Sep 2011 09:15:37 +0000
- Subject: [Bug symtab/13173] New: add-symbol-file -s option still requirestext address
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=13173
Bug #: 13173
Summary: add-symbol-file -s option still requires text address
Product: gdb
Version: 7.2
Status: NEW
Severity: normal
Priority: P2
Component: symtab
AssignedTo: unassigned@sourceware.org
ReportedBy: konrad.schwarz@siemens.com
Classification: Unclassified
The gbd.info file has the following synopsis for add-symbol-file:
add-symbol-file FILENAME ADDRESS
add-symbol-file FILENAME ADDRESS [ -readnow ]
add-symbol-file FILENAME -sSECTION ADDRESS ...
Aside: the first synopsis is redundant, given the second. You might want to
delete the first line.
GDB does not actually accept the third synopsis. Instead, it accepts:
add-symbol-file FILENAME ADDRESSS -sSECTION ADDRESS ...
where ADDRESS is the address of the .text section.
Given the following command line (that is, specify the .text section address
twice, once as a dummy 0, once as the real address)
add-symbol-file FILENAME 0 ... -s.text TEXT_ADDDRESS ...
GDB 7.0 used the -s.text TEXT_ADDRESS as the
address of .text address and disregarded the 0 argument. (I expect that
later arguments simply overwrote earlier arguments).
GDB 7.2 uses the first ADDRESS argument (0, in this case) as the .text
section address and reports an error when it is specified a second time.
This problem occurs in the context of debugging Linux kernel modules. The
Linux kernel module linker/loader allocates the large number of sections in a
module at essentially random locations, so that the third synopsis form is
required.
A short GDB script is required to walk through Linux kernel module
linker/loader data structures to discover which sections the linker/loader
has loaded where. The .text section is not necessarily the first section
in this list.
Thus, when synthesizing the necessary add-symbol-file command,
it would be very nice if the third synopsis actually worked as advertised,
that is without requiring an initial ADDRESS implicitly understood
to be the address of the .text segment.
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