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Map offsets
- From: "Bäng-ha " <jpbarda at hotmail dot com>
- To: gdb at sources dot redhat dot com
- Date: Sat, 09 Mar 2002 15:52:34 +0000
- Subject: Map offsets
- Bcc:
Hi!
I'm sure this is a rather stupid question, but I'll ask it anyway:
I'm debugging a couple of processes under linux, and I want to load the
symbols from glibc. Now, the only way I've managed to figure out as to
perform the task of finding the base address of libc if to look at the
memory maps in /proc/?/maps, whence I get the base address of libc to be
e.g. 0x40020000 (this was for mingetty). So naturally, I do add-symbol-file
/lib/libc-2.2.2.so 0x4002000, but as it turns, it should be loaded
0x4003BCB0, i.e. at an offset of 0x1BCB0 from what /proc says. (I got the
exact offset from looking at the dynamically linked function tables and
comparing the read function to what was acutally loaded, if that would
somehow matter) Anyway, I guess I could live with this small annoyance, if
it wasn't for that other libs wants to be loaded with other offsets. 0x1BCB0
didn't work with e.g. libresolv. And, I want to know the cause of this as
well, of
course.
So could someone tell me how to get the real offset, because I can't imagine
that there isn't an error-free way to get the address, right?
Thanks in advance
Fredrik Tolf
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