From: Josh Marshall <joshua.r.marshall.1991@gmail.com>
To: ngn <ngn@ngn.tf>
Cc: linux-newbie@vger.kernel.org
Subject: Re: Feedback on my development setup
Date: Thu, 18 Apr 2024 17:40:20 -0400 [thread overview]
Message-ID: <CAFkJGRcgJA4qe1AVi23ZQVPr_UEzkTBPH8f30g=OsKmii7QzQw@mail.gmail.com> (raw)
In-Reply-To: <CAFkJGRcg+ThJ-xUve0=WorChW=-6PreLHXeM8YwtwzwpkHTu8g@mail.gmail.com>
Looks like breakpoints aren't working? https://paste.debian.net/1314501/
On Thu, Apr 18, 2024 at 3:52 PM Josh Marshall
<joshua.r.marshall.1991@gmail.com> wrote:
>
> Looks like there are some fiddly bits about configuring the kernel.
> Practically speaking, configuration needs to first be done within the
> VM, then everything can be moved and compiled outside of it.
>
> How do I submit a final writeup to put somewhere?
>
> On Thu, Apr 18, 2024 at 3:27 PM Josh Marshall
> <joshua.r.marshall.1991@gmail.com> wrote:
> >
> > There's a type already. Term 1 should be:
> >
> > qemu-system-x86_64 -s -cpu host -nographic -accel kvm -m 1G -kernel
> > arch/x86/boot/bzImage -append "root=/dev/sdb3 rw
> > console=ttyS0,115200n8" -drive
> > format=qcow2,file=$HOME/Downloads/Arch-Linux-x86_64-basic.qcow2
> >
> > However, the kernel panics because it can't mount the root FS on an
> > unknown block. I don't know what the cause is. However, the UUIDs
> > are scrambled from what are in GRUB. Is there some sort of security
> > going on here?
> >
> > On Thu, Apr 18, 2024 at 3:15 PM Josh Marshall
> > <joshua.r.marshall.1991@gmail.com> wrote:
> > >
> > > So the final outline would look like the following?
> > >
> > > Source:
> > > https://github.com/archlinux/arch-boxes
> > >
> > > setup:
> > >
> > > git clone $LINUX_REPO &
> > > wget https://geo.mirror.pkgbuild.com/images/latest/Arch-Linux-x86_64-basic.qcow2
> > >
> > > echo add-auto-load-safe-path
> > > “$LINUX_REPO_PATH/scripts/gdb/vmlinux-gdb.py” >>
> > > "$HOME/.config/gdb/gdbinit"
> > >
> > > echo ‘export LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1’ >> $HOME/.bashrc
> > > echo ‘export USERCFLAGS=" -ggdb "’ >> $HOME/.bashrc
> > >
> > > push $LINUX_REPO_PATH
> > >
> > > echo “CONFIG_SATA_AHCI=y” >> .config
> > > echo “CONFIG_DEBUG_INFO=y” >> .config
> > > echo “CONFIG_DEBUG_INFO_DWARF5=y” >> .config
> > > echo “CONFIG_GDB_SCRIPTS=y” >> .config
> > > echo “CONFIG_GDB_INFO_REDUCED=n” >> .config
> > > echo “CONFIG_KGDB=y” >> .config
> > > echo “CONFIG_FRAME_POINTER=y” >> .config
> > > echo “CONFIG_KVM_GUEST=y” >> .config
> > > echo “CONFIG_RANDOMIZE_BASE=n” >> .config
> > >
> > > make localyesconfig
> > > pop
> > >
> > > source $HOME/.bashrc
> > > mkdir -p $HOME/mnt/arch
> > >
> > > Iterate:
> > > guestmount -w -a $HOME/Downloads/Arch-Linux-x86_64-basic.qcow2 -m
> > > /dev/sda3 ~/mnt/arch/
> > > <copy sources, files, perform compilation steps, etc as needed to
> > > inside the VM image as needed each development iteration>
> > > umount ~/mnt/arch
> > >
> > > Term 1:
> > > qemu-system-x86_64 -s -cpu host -nographic -accel kvm -m 1G -kernel
> > > vmlinux2 -append "root=/dev/sda3 rw console=ttyS0,115200n8 nokaslr
> > > " -drive format=qcow2,file=$HOME/Downloads/Arch-Linux-x86_64-basic.qcow2
> > >
> > > Term 2:
> > > gdb $LINUX_REPO_PATH/vmlinux
> > > : target remote:1234
> > > <set break points>
> > > : continue
> > >
> > > On Thu, Apr 18, 2024 at 11:36 AM ngn <ngn@ngn.tf> wrote:
> > > >
> > > > On Wed, Apr 17, 2024 at 05:18:34PM -0400, Josh Marshall wrote:
> > > > > One issue I'm seeing is that gdb isn't seeing debugging symbols. I'm
> > > > > getting the following output with the config linked.
> > > > >
> > > > > https://pastebin.com/tjq7QtQk
> > > > >
> > > > > ```
> > > > > anadon@botamon:~/Documents/code/linux$ gdb arch/x86/boot/bzImage
> > > > > GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1) 15.0.50.20240403-git
> > > > > Copyright (C) 2024 Free Software Foundation, Inc.
> > > > > License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> > > > > This is free software: you are free to change and redistribute it.
> > > > > There is NO WARRANTY, to the extent permitted by law.
> > > > > Type "show copying" and "show warranty" for details.
> > > > > This GDB was configured as "x86_64-linux-gnu".
> > > > > Type "show configuration" for configuration details.
> > > > > For bug reporting instructions, please see:
> > > > > <https://www.gnu.org/software/gdb/bugs/>.
> > > > > Find the GDB manual and other documentation resources online at:
> > > > > <http://www.gnu.org/software/gdb/documentation/>.
> > > > >
> > > > > For help, type "help".
> > > > > Type "apropos word" to search for commands related to "word"...
> > > > > Reading symbols from arch/x86/boot/bzImage...
> > > > > (No debugging symbols found in arch/x86/boot/bzImage)
> > > > > ```
> > > > >
> > > >
> > > > You should load vmlinux to the gdb, not the bzImage. bzImage is a
> > > > compressed version of the kernel and its used boot, vmlinux is the
> > > > static ELF binary that contains the debugging symbols.
next prev parent reply other threads:[~2024-04-18 21:40 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-16 12:38 Feedback on my development setup Josh Marshall
2024-04-16 14:56 ` ngn
2024-04-16 15:03 ` Josh Marshall
2024-04-16 15:21 ` ngn
2024-04-17 16:11 ` Josh Marshall
[not found] ` <CAPzh0z8RySn429XYQHoP_c9UA+pb6SLHGhH40vQDhc3P2xiysQ@mail.gmail.com>
2024-04-17 21:18 ` Josh Marshall
2024-04-18 15:35 ` ngn
2024-04-18 19:15 ` Josh Marshall
2024-04-18 19:27 ` Josh Marshall
2024-04-18 19:52 ` Josh Marshall
2024-04-18 21:40 ` Josh Marshall [this message]
2024-04-19 16:14 ` ngn
2024-04-23 15:34 ` Josh Marshall
2024-04-23 16:08 ` Pranjal Singh
2024-04-23 16:39 ` Bilbao, Carlos
2024-04-23 17:43 ` Josh Marshall
2024-04-25 5:37 ` Josh Marshall
2024-04-25 14:36 ` Bilbao, Carlos
2024-04-25 14:54 ` Josh Marshall
2024-04-25 15:14 ` Jonathan Corbet
[not found] ` <CAFkJGReoq2s+LR1kj1hj8QvsKsEhk+CLYtCXV=DQTjTqan3DOg@mail.gmail.com>
2024-04-25 16:59 ` Carlos Bilbao
2024-04-25 17:08 ` Josh Marshall
2024-04-25 20:14 ` Theodore Ts'o
2024-04-25 20:02 ` Theodore Ts'o
2024-04-25 14:32 ` Thomas Bertschinger
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