run/noux_vim yields black SDL window on linux_x86

[Christian Prochaska]

Hello,

I just tried the 'noux_vim' run script on Xubuntu 14.04 and it worked
for me.

This is the log output I'm seeing:

spawn ./core
Genode 15.08-34-g8c7e052
int main(): --- create local services ---
int main(): --- start init ---
int main(): transferred 17592186044415 MB to init
int main(): --- init created, waiting for exit condition ---
[init] parent provides
[init]   service "ROM"
[init]   service "LOG"
[init]   service "CAP"
[init]   service "RAM"
[init]   service "RM"
[init]   service "CPU"
[init]   service "PD"
[init]   service "IRQ"
[init]   service "IO_PORT"
[init]   service "IO_MEM"
[init]   service "SIGNAL"
[init] child "timer"
[init]   RAM quota:  876544
[init]   ELF binary: timer
[init]   priority:   0
[init]   provides service Timer
[init] child "fb_sdl"
[init]   RAM quota:  4022272
[init]   ELF binary: fb_sdl
[init]   priority:   0
[init]   provides service Input
[init]   provides service Framebuffer
[init] child "terminal"
[init]   RAM quota:  1925120
[init]   ELF binary: terminal
[init]   priority:   0
[init]   provides service Terminal
Quota exceeded! amount=24576, size=4096, consumed=24576
[init] upgrading quota donation for Env::CPU (8192 bytes)
[init] child "noux"
[init]   RAM quota:  1073569792
[init]   ELF binary: noux
[init]   priority:   0
[init -> fb_sdl] Could not open ROM session for module "config"
[init -> fb_sdl] Could not obtain config file
[init -> terminal] int main(int, char**): --- terminal service started ---
[init] child "timer" announces service "Timer"
[init -> noux] --- noux started ---
[init -> noux] tar archive 'vim.tar' local at 2ac00a020000, size is 19998720
[init -> fb_sdl] creating virtual framebuffer for mode 1024x768 at ...64...
[init] child "fb_sdl" announces service "Framebuffer"
[init] child "fb_sdl" announces service "Input"
[init -> terminal] cell size is 8x16
[init] child "terminal" announces service "Terminal"
[init -> terminal] create terminal session
[init -> terminal] new terminal session:
[init -> terminal]   framebuffer has 1024x768 pixels
[init -> terminal]   character size is 8x16 pixels
[init -> terminal]   terminal size is 128x48 characters
[init -> noux] invalid opcode 21
[init -> noux -> /bin/vim] int getrlimit(int, rlimit*): not implemented 2
[init -> noux -> /bin/vim] unsupported ioctl (request=0x802c7414)

Christian

On 09/17/2015 11:27 AM, Norman Feske wrote:
> Hi Alex,
>
> On 17.09.2015 10:41, Alexander Senier wrote:
>> I'm trying to run some more elaborate demos on with Linux as the base
>> system. My host is a Debian Stretch (x86_64), I'm on master which I
>> checked out this morning (5cf8c49c).
>>
>> When trying to run 'noux_vim', a completely black SDL window (no text or
>> anything) shows up. The following is output on the command line:
>>
>> $ make run/noux_vim
> unfortunately, all but the simplest noux scenarios don't work on Linux.
> Ironically, 'fork' is not implemented on this base platform. On regular
> L4-like microkernels, it is possible to remotely manipulate address
> spaces. So the noux runtime is able to copy the address space of the
> forking noux process to another one. The Linux kernel does not allow us
> to do that (well, at least when not using ptrace or a similar hook).
>
> Consequently, implementing fork on Linux calls for a different
> implementation where the noux process itself plays a more active role
> (i.e., issuing the Linux clone syscall directly, copying the locally
> implemented region-manager structures). It is actually quite tricky. So
> far, I found that the hassle wasn't worth the effort.
>
> The plain noux.run script does work because is solely executes 'ls',
> which does not rely on fork. In contrast, the noux_vim.run scenario
> requires fork because Vim temporarily spawns a shell at startup.
>
> Do you deem noux as critical in your Linux-based scenario? If yes, we
> should investigate to best way how to go forward.
>
> Cheers
> Norman
>