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Re: [PATCH] Ignore the first entry returned by svr4_current_sos_via_xfer_libraries for dynamically linked programs
- From: Ben Cheng <bccheng at google dot com>
- To: Jan Kratochvil <jan dot kratochvil at redhat dot com>
- Cc: gdb-patches at sourceware dot org
- Date: Tue, 4 Jun 2013 11:18:10 -0700
- Subject: Re: [PATCH] Ignore the first entry returned by svr4_current_sos_via_xfer_libraries for dynamically linked programs
- References: <CAPk6zkCTrkS960JAG70PdTaTAE=FQ1y4V2CneiNutSu6CG8rwA at mail dot gmail dot com> <20130604180722 dot GA23588 at host2 dot jankratochvil dot net>
Hmm this problem only shows up after I refresh gdbserver from the
unmodified gdb 7.6 tree. As you mentioned, gdb 7.1 did not support
library-list-svr4, so when I paired gdbserver 7.1 with gdb 7.6 they
also work fine.
On Tue, Jun 4, 2013 at 11:07 AM, Jan Kratochvil
<jan.kratochvil@redhat.com> wrote:
> Hi Ben,
>
> On Tue, 28 May 2013 20:31:31 +0200, Ben Cheng wrote:
>> The first entry in the xml list returned by
>> svr4_current_sos_via_xfer_libraries() is the executable itself.
> [...]
> http://sourceware.org/bugzilla/show_bug.cgi?id=15507
>> Currently Android is using gdbserver from 7.1 and gdb from 7.3.
> [...]
>> <library-list-svr4 version="1.0"><library name="<test_program>"
>> lm="0xb6fed108" l_addr="0x0" l_ld="0x0"/><library name="/system/bin/linker"
>
> in fact this GDB patch should be dropped.
>
> Bug is in the Android gdbsever implementation. FSF gdbserver 7.1 did not
> support <library-list-svr4/> at all, this feature is in gdbserver 7.4+ only.
>
> Main executable should not have an entry, it has only "main-lm" attribute:
> info '(gdb)Library List Format for SVR4 Targets'
> Additionally the single `main-lm' attribute specifies address of
> `struct link_map' used for the main executable.
>
> GNU/Linux FSF gdbserver-HEAD list looks like:
>
> Sending packet: $qXfer:libraries-svr4:read::0,fff#91...Packet received: l<library-list-svr4 version="1.0" main-lm="0x7ffff7ffe208"><library name="/home/jkratoch/redhat/gdb-clean/gdb/testsuite/gdb.base/gcore-relro-lib.so" lm="0x7ffff7ff97f0" l_addr="0x7ffff7bda000" l_ld="0x7ffff7ddadf8"/><library name="/lib64/libm.so.6" lm="0x7ffff7fe8000" l_addr="0x7ffff78d8000" l_ld="0x7ffff7bd8da8"/><library name="/lib64/libc.so.6" lm="0x7ffff7fe84c8" l_addr="0x7ffff7518000" l_ld="0x7ffff78d0b80"/><library name="/lib64/ld-linux-x86-64.so.2" lm="0x7ffff7ffd998" l_addr="0x7ffff7ddc000" l_ld="0x7ffff7ffcdf0"/></library-list-svr4>^M
>
>
> Regards,
> Jan