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From: Yao Qi <qiyaoltc@gmail.com>
Date: Tue, 18 Oct 2016 19:19:00 -0000
Message-ID: <CAH=s-PO51tuy7hawLzkN0f5oL29dc-+mkEoD-oCer=x_HcQqRw@mail.gmail.com>
Subject: Re: GDB does not stop at assembly code address
To: deffo@gmx.de
Cc: GDB <gdb@sourceware.org>
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On Tue, Oct 18, 2016 at 12:53 PM,  <deffo@gmx.de> wrote:
> Here's the output:
>
> (gdb) b startup_32
> Breakpoint 1 at 0xc1000000: file arch/x86/kernel/head_32.S, line 97.
> (gdb) print startup_32
> $1 =3D {<text variable, no debug info>} 0xc1000000 <startup_32>
> (gdb) info breakpoints
> Num     Type           Disp Enb Address    What
> 1       breakpoint     keep y   0xc1000000 arch/x86/kernel/head_32.S:97
>
> (gdb) b start_kernel
> Breakpoint 1 at 0xc1be3755: file init/main.c, line 480.
> (gdb) print start_kernel
> $1 =3D {void (void)} 0xc1be3755 <start_kernel>
> (gdb) info breakpoints
> Num     Type           Disp Enb Address    What
> 1       breakpoint     keep y   0xc1be3755 in start_kernel at init/main.c=
:480
>

Looks breakpoint is set on the right place.  Nothing wrong there.

> I guess the "no debug info" would be the explanation, but why is that? Th=
e address is listed as a FUNC in readelf -Ws vmlinux, thus it should be cor=
rect. What do I have to do?
>

"no debug info" is about startup_32, which is written in assembly without d=
ebug
information.  It is nothing wrong there.  I have no idea why breakpoint on
startup_32 is not hit.

--=20
Yao (=E9=BD=90=E5=B0=A7)