[Qemu-devel] Problem with running machine code specified in the program

[Qemu-devel] Problem with running machine code specified in the program

[Hans Yang]

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I got "qemu: uncaught target signal 11 (Segmentation fault) - exiting" when
running program like that:

 

typedef int (*native_f)();

typedef struct {

    native_f func;

} ST;

 

int main()

{

    ST p;

    const int code[1] = {

        0xe1a0f00e  // mov pc, lr

    };

 

    p.func = (native_f)code;

p.func();

 

return 0;

}

 

My platform details:

CPU: Intel Pentium 4 2.40G

OS: Fedora Core release 2

Compiler: arm-linux-gcc 2.95.3

Emulator: qemu-arm 0.6.0

 


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Re: [Qemu-devel] Problem with running machine code specified in the program

[Paul Brook]

On Monday 30 August 2004 07:00, Hans Yang wrote:
> I got "qemu: uncaught target signal 11 (Segmentation fault) - exiting" when
> running program like that:

Works for me with on i386 Debian Sid with qemu CVS+arm patches. Look in the 
list archives for my arm patch(es).

Paul

cause found for qemu-arm problems on fedora 2 (Re: [Qemu-devel] Problem with running machine code specified in the program)

[Lennert Buytenhek]

On Mon, Aug 30, 2004 at 02:00:39PM +0800, Hans Yang wrote:

> I got "qemu: uncaught target signal 11 (Segmentation fault) - exiting" when
> running program like that:

I was running into this too, and just checked it out.  You should do:

1. Run 'setarch i686 qemu-arm' instead of 'qemu-arm'.
2. Downgrade to the original 2.6.5 kernel that came with FC2.

It seems that qemu-arm broke somewhere between fedora's version of
2.6.6 and 2.6.8, their current kernel.  I'm trying the intermediate
releases right now.


cheers,
Lennert

Re: cause found for qemu-arm problems on fedora 2 (Re: [Qemu-devel] Problem with running machine code specified in the program)

[Lennert Buytenhek]

On Fri, Sep 03, 2004 at 03:34:00PM +0200, Lennert Buytenhek wrote:

> > I got "qemu: uncaught target signal 11 (Segmentation fault) - exiting" when
> > running program like that:
> 
> I was running into this too, and just checked it out.  You should do:
> 
> 1. Run 'setarch i686 qemu-arm' instead of 'qemu-arm'.
> 2. Downgrade to the original 2.6.5 kernel that came with FC2.
> 
> It seems that qemu-arm broke somewhere between fedora's version of
> 2.6.6 and 2.6.8, their current kernel.  I'm trying the intermediate
> releases right now.

OK, here are my findings.

I tried qemu-arm from qemu 0.5.5 and from all daily qemu CVS snapshots
between 20040504 and 20040901.  Of those, there are actually only 16
different qemu-arm binaries (with a distinct md5 sum), so I only used
those.

I tried the Fedora Core 2 kernels 2.6.5-1.358 (original), 2.6.6-1.427,
2.6.6-1.435, 2.6.6-1.435.2.1, 2.6.6-1.435.2.3, 2.6.7-1.494.2.2 and
2.6.8-1.521 (the latest.)

On all kernels, you get a sig11 if you run without 'setarch i686'.

If you run with 'setarch i686', kernel 2.6.6-1.435.2.3 still runs
everything fine, but 2.6.7-1.494.2.2 breaks all qemu versions except
for the 20040519 CVS snapshot.  And on the kernel after that,
2.6.8-1.521, all qemu versions are broken.  If I then try to set
vm.legacy_vm_layout to 1, 20040519 starts working again, but all
other snapshots before and after remain broken.

Puzzled.


--L