TFTP does not work with QEMU

[Daniel Vandersee]

Hello,

this is the backtrace of the thread d.03 (task #d is tftp):

> backtrace (thread d.03, fp=01030f8c, pc=000f9f9b):
>   #1  000f9f9b
>   #2  0100ec73 : check_pcibios + 0x13
>       /home/user/ext/l4env-26/l4/pkg/pci/lib/src/bios32.c:549
>   #3  0100ef39 : pci_find_bios + 0x69
>       /home/user/ext/l4env-26/l4/pkg/pci/lib/src/bios32.c:916
>   #4  0100f0c5 : pcibios_init + 0x25
>       /home/user/ext/l4env-26/l4/pkg/pci/lib/src/bios32.c:1269
>   #5  01003307 : netboot_init + 0x17
>       /home/user/l4env-26/l4/pkg/tftp/server/src/netboot/netboot.c:322
>   #6  0100048c : real_main + 0x4c
>       /home/user/ext/l4env-26/l4/pkg/tftp/server/src/main.c:241
>   #7  01017575 : l4th_thread_start + 0x55
>       /home/user/ext/l4env-26/l4/pkg/thread/lib/src/create.c:72
> 
>  --kernel-bt-follows--
>   #0  f0006bd0
>   #1  f000666d
>   #2  f0007aa7
>   #3  f0008dfa
>   #4  f00290f4


This is the disassembly around the lret-instruction at 0f9f9b ( I didn't
figured out to which module this belongs ).

> 000f9f72        out    %eax,(%dx)
> 000f9f73        mov    $0xcfc,%dx
> 000f9f77        in     (%dx),%eax
> 000f9f78        cmp    $0x12378086,%eax
> 000f9f7d        jne    0xf9f92
> 000f9f7f        mov    $0xf0000,%ebx
> 000f9f84        mov    $0x0,%ecx
> 000f9f89        mov    $0x9fa0,%edx
> 000f9f8e        xor    %al,%al
> 000f9f90        jmp    0xf9f94
> 000f9f92        mov    $0x80,%al
> 000f9f94        popfw
> 000f9f96        andl   $0xfffffffc,0x4(%esp)
> 000f9f9b        lret
> 000f9f9c        add    %al,(%eax)
> 000f9f9e        add    %al,(%eax)
> 000f9fa0        pushfw
> 000f9fa2        cli
> 000f9fa3        push   %esi
> 000f9fa4        push   %edi
> 000f9fa5        cmp    $0x1,%al
> 000f9fa7        jne    0xf9fbd
> 000f9fa9        mov    $0x210,%bx

Daniel


Adam Lackorzynski wrote:
> Hi,
> 
> On Mon Oct 02, 2006 at 16:58:18 +0200, Daniel Vandersee wrote:
> 
>>when I try to run tftp under QEMU 0.8.2 with an emulated pcnet or
>>ne2k-pci network card I get the following error. However, tftp under
>>VMWare works just fine. Any help would be appreciated.
>>
>>Kind regards,
>>Daniel
>>
>>
>>>names   | Starting thread listening for `exit' events
>>>simplets| Configured for 30 tasks.
>>>rtc     | Date:02.10.2006 Time:14:42:15
>>>io      | do_args(): Disabling internal IRQ handling.
>>>tftp    | NICs supported: E1000, EEPRO100, NE2000/PCI, PCNET32/PCI, RTL8139,
>>>tftp    |                 Tulip, VIA 86C100
>>>io      | PCI: Using configuration type 1
>>>io      | PCI: Probing PCI hardware
>>>io      | PCI: Probing PCI hardware (bus 00)
>>>
>>>KERNEL: d.3 (tcb=c0341800) killed:
>>>Unhandled trap
>>>
>>>EAX 12378000 EBX 000f0000 ECX 00000000 EDX 00009fa0
>>>ESI 00000000 EDI 01044e30 EBP 0102ff8c ESP 0102ff7c
>>>EIP 000f9f9b EFLAGS 00013206
>>>CS 001b SS 0023 DS 0023 ES 0023 FS 0023 GS 0043
>>>trap 13 (General Protection), error 00000018, from user mode
>>>(internal event regarding GDT entry no. 0x03)
> 
> 
> Please tell us what instructions are at 000f9f9b and where this is in
> the source code. bttd.3 will also help.
> 
> 
> 
> Adam