[okl4-developer] [OKL2.1]spurious exception as soon as OKlinux forks init.

Mon Sep 29 22:44:17 EST 2008

On Mon, Sep 29, 2008 at 05:16:26AM -0700, Amit Daniel wrote:
> 
> Dear All,
> 
> I have tested some test examples with okl microkernel and iguana. They works
> fine.
> But when i try executing OKLinux as an application, spurious exception
> starts coming. I am building the image file as,
> tools/build.py machine=gta01 project=iguana wombat=True 
> enable_fastpaths=False
> This exception is coming as soon kernel tries to fork the /sbin/init
> process. I tried to put some print in main interrupt handler but those
> prints are not coming. so, the exception source is not clear.
> 

Hi Amit

The exception handler for Linux processes is the syscall_loop(), not 
interrupt_loop(), which I think may be what is confusing you.

Also, have you made any modifications to either the OKL4 or the OK Linux
distribution in any way?  If so what have you changed?

	-gl

> The full log is shown below,
> 
> SMDK2440 # bootelf 33000000
> Loading kernel.text @ 0x30000000 (79148 bytes)
> Loading kernel.rodata @ 0x3001352c (27890 bytes)
> Loading kernel.kdebug @ 0x3001a21e (16774 bytes)
> Loading kernel.init @ 0x3001e3a4 (6128 bytes)
> Loading kernel.roinit @ 0x3001fb94 (768 bytes)
> Loading kernel.data @ 0x30020000 (5636 bytes)
> Loading kernel.got @ 0x30021604 (4 bytes)
> Loading kernel.got.plt @ 0x30021608 (12 bytes)
> Loading kernel.kdebug-data @ 0x30021614 (1052 bytes)
> Clearing kernel.bss @ 0x30021a30 (14152 bytes)
> Loading kernel.kspace @ 0x30028000 (16384 bytes)
> Loading kernel.traps @ 0x3002c000 (4096 bytes)
> Loading kernel.utcb_page @ 0x3002d000 (4096 bytes)
> Loading ig_server.text @ 0x30088000 (47140 bytes)
> Loading ig_server.rodata @ 0x30093824 (3083 bytes)
> Loading ig_server.data @ 0x30027430 (372 bytes)
> Loading ig_server.got @ 0x300275a4 (16 bytes)
> Clearing ig_server.bss @ 0x300275b8 (292 bytes)
> Loading event.text @ 0x30098000 (20780 bytes)
> Loading event.rodata @ 0x3009d12c (1827 bytes)
> Loading event.data @ 0x30096850 (264 bytes)
> Loading event.got @ 0x30096958 (16 bytes)
> Clearing event.bss @ 0x30096968 (288 bytes)
> Loading vtimer.text @ 0x300c0000 (26176 bytes)
> Loading vtimer.rodata @ 0x300c6640 (3260 bytes)
> Loading vtimer.data @ 0x300c82fc (580 bytes)
> Loading vtimer.got @ 0x300c8540 (16 bytes)
> Clearing vtimer.bss @ 0x300c8550 (408 bytes)
> Loading vserial.text @ 0x300e0000 (25496 bytes)
> Loading vserial.rodata @ 0x300e6398 (2696 bytes)
> Loading vserial.data @ 0x300cc000 (1076 bytes)
> Loading vserial.got @ 0x300cc434 (16 bytes)
> Clearing vserial.bss @ 0x300cc444 (1056 bytes)
> Loading vlcd.text @ 0x300e8000 (22876 bytes)
> Loading vlcd.rodata @ 0x300ed95c (2003 bytes)
> Loading vlcd.data @ 0x300e7130 (992 bytes)
> Loading vlcd.got @ 0x300e7510 (16 bytes)
> Clearing vlcd.bss @ 0x300e7520 (412 bytes)
> Loading vrtc.text @ 0x30514000 (28024 bytes)
> Loading vrtc.rodata @ 0x3051ad78 (3756 bytes)
> Loading vrtc.data @ 0x30512000 (612 bytes)
> Loading vrtc.got @ 0x30512264 (16 bytes)
> Clearing vrtc.bss @ 0x30512274 (396 bytes)
> Loading vmlinux.text @ 0x30600000 (1396736 bytes)
> Loading vmlinux.text.init.refok @ 0x30755000 (868 bytes)
> Loading vmlinux.exit.text @ 0x30755364 (1132 bytes)
> Loading vmlinux.rodata @ 0x30756000 (196028 bytes)
> Loading vmlinux.__ksymtab @ 0x30785dbc (13752 bytes)
> Loading vmlinux.__ksymtab_gpl @ 0x30789374 (3416 bytes)
> Loading vmlinux.__ksymtab_strings @ 0x3078a0cc (39044 bytes)
> Loading vmlinux.__param @ 0x30793950 (340 bytes)
> Loading vmlinux.data @ 0x30794000 (73728 bytes)
> Loading vmlinux.data.cacheline_aligned @ 0x307a6000 (192 bytes)
> Loading vmlinux.init.text @ 0x307a7000 (66656 bytes)
> Loading vmlinux.init.data @ 0x307b7460 (4668 bytes)
> Loading vmlinux.init.setup @ 0x307b86a0 (600 bytes)
> Loading vmlinux.initcall.init @ 0x307b8900 (352 bytes)
> Loading vmlinux.con_initcall.init @ 0x307b8a60 (4 bytes)
> Loading vmlinux.init.ramfs @ 0x307b9000 (134 bytes)
> Loading vmlinux.exitcall @ 0x307ba000 (108 bytes)
> Clearing vmlinux.bss @ 0x307ba080 (141456 bytes)
> Loading rootfs @ 0x30800000 (5734400 bytes)
> Loading bootinfo @ 0x30530000 (24576 bytes)
> ## Starting application at 0x30000000 ...
> s3c2410_init_interrupts:124: LN2410_INT_MASK
> s3c2410_init_interrupts:135: LN2410_INT_MASK: 6f7f7fff
> 
> OKL4 - (provider: Open Kernel Labs) built on Sep 29 2008 15:11:02 using gcc
> ver.device_enable_impl: done
> Linux version 2.6.23-arm (root at localhost.localdomain) (gcc version 3.4.4) #2
> Mo8Kernel memory ranges:
>   0: 0x01300000-0x026ff000 (5119 pages)
>   total 5119 pages
> end: 0
> Built 6 zonelists in Zone order.  Total pages: 6096
> Kernel command line: igms_name=ramdisk root=/dev/igms0
> PID hash table entries: 128 (order: 7, 512 bytes)
> dummy_timer_init: initializing.
> console [l4con0] enabled
> Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
> Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
> Memory: 20204k/24600k available (1365k kernel code, 4372k reserved, 326k
> data, )Found timer server (tid: 0000c001, handle: 1)
> vtimer: init done (handle: 1, owner: 1c001, mask: 1)
> Requesting timer: 10000000
> Mount-cache hash table entries: 512
> ptrace_break_init unimplemented
> NET: Registered protocol family 16
> NET: Registered protocol family 2
> IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
> TCP established hash table entries: 1024 (order: 1, 8192 bytes)
> TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
> TCP: Hash tables configured (established 1024 bind 1024)
> TCP reno registered
> io scheduler noop registered
> io scheduler anticipatory registered (default)
> io scheduler deadline registered
> io scheduler cfq registered
> RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
> loop: module loaded
>  igms0: unknown partition table
> Iguana ramdisk driver initialized
> kobject_add failed for ttyS0 with -EEXIST, don't try to register things with
> th.This architecture does not implement dump_stack()
> Iguana virtual serial driver v1.0
> TCP cubic registered
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> NET: Registered protocol family 15
> VFS: Mounted root (ext2 filesystem) readonly.
> vserial: init done (handle: 0, owner: 1c001, mask: 2)
> unhandled user exception (0x0) @ 0 in init (1)
> unhandled user exception (0x0) @ 0 in init (1)
> unhandled user exception (0x0) @ 0 in init (1)
> unhandled user exception (0x0) @ 0 in init (1)
> unhandled user exception (0x0) @ 0 in init (1)
>    
> 
> -- 
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> 
> 
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