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[PATCH] example of 64-bit debug

From: pasha (biblio)
Subject: [PATCH] example of 64-bit debug
Date: Tue, 9 May 2023 17:01:08 +0200

Add example of 64-bit debugging.

 contributing.mdwn | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/contributing.mdwn b/contributing.mdwn
index c4a3787d..90705d93 100644
--- a/contributing.mdwn
+++ b/contributing.mdwn
@@ -199,6 +199,23 @@ After you have a Hurd vm set up and running:
 * Start hacking.
 * For shutting down, use `reboot`, then press `c` in grub and issue halt (to 
avoid filesystem corruption). Adding `--no-reboot` to the qemu line should 
help, too.
+## Debug 64-bit gnumach
+[[build|microkernel/mach/gnumach/building/]] 64-bit gnumach
+run a spare Hurd vm (prepare for data loss in vm):
+* `kvm -net user,hostfwd=tcp: -net nic,model=e1000 -drive 
file=$(echo debian-hurd*.img),cache=writeback -m 1G`
+* `cd gnumach/build`
+* `scp -P 2222 gnumach.gz user@`
+* You may copy `gnumach.gz` (also create new grub entry) or replace using `mv 
/home/user/gnumach.gz /boot/gnumach-xxx.gz`
+* Shutdown vm.
+* Append `console=com0` in boot menu and switch to console mode in qemu. (We 
have known issues with vga output for 64-bit.)
+* `kvm -s -S -net user,hostfwd=tcp: -net nic,model=e1000 
-drive file=$(echo debian-hurd*.img),cache=writeback -m 1G` (note: `-s -S` 
+* `gdb ./gnumach`
+* `(gdb) target remote :1234`
+* Press `c` to continue booting.
 <a name="hurd_on_modern_microkernel"></a>
 # Design / Research: GNU Hurd on a Modern Microkernel

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