[uml-devel] Question about UML gdb

[uml-devel] Question about UML gdb

[Alex LIU]

Hi all:

I have 2 questions about UML gdb:

1.how to get the address of current process UML gdb?
It seems "esp & 0xffffe000" is not the correct address.

2.how to read the contents of a file in UML gdb?
The file is an object of struct file. I only know the address of the file.

Thanks a lot!

Alex



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Re: [uml-devel] Question about UML gdb

[stian]

> I have 2 questions about UML gdb:
>
> 1.how to get the address of current process UML gdb?
> It seems "esp & 0xffffe000" is not the correct address.

For most applications, the mention address-space is mapped to
linux-gate.so, which to my understanding is a part of sysenter/tls
implementation in glibc. Either make gdb breakpoint (since processes doing
any system calls appear with this setup, or disable tls libraries. Atleast
that works for my setup).
To disable tls:
mv /lib/tls /lib/tls-old
and later to re-enable
mv /lib/tls-old /lib/tls

Hopes this gives any help.

Stian


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Re: [uml-devel] Question about UML gdb

[Nix]

On Wed, 27 Apr 2005, stian@nixia.no moaned:
> For most applications, the mention address-space is mapped to
> linux-gate.so, which to my understanding is a part of sysenter/tls
> implementation in glibc.

It is the vsyscall implementation; it's exported by the kernel,
not by glibc.

-- 
This is like system("/usr/funky/bin/perl -e 'exec sleep 1'");
   --- Peter da Silva


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