[MeeGo-dev] fennec(Illegal instruction) issue on MeeGo

[imdat.solak at nokia.com]

On Dec 7, 2010, at 16:40 , ext Thiago Macieira wrote:

> On Tuesday, 7 de December de 2010 21:47:48 imdat.solak at nokia.com wrote:
>> On Dec 7, 2010, at 15:38 , ext Auke Kok wrote:
>>> On 12/07/10 01:25, Paul Li wrote:
>>>> Hi All,
>>>> 
>>>>         I met an issue with fennec on MeeGo, I recompiled this app with
>>>>         ‘-march=armv7-a -mtune=cortex-a8 -mlittle-endian
>>>>         -mfpu=vfpv3-d16 -mfloat-abi=softfp’ and ‘-march=armv7-a
>>>>         -mtune=cortex-a8 -mlittle-endian -mfpu=vfpv3-d16
>>>>         -mfloat-abi=soft’. Both of them met the following issue:
>>>>         Program received signal SIGILL, Illegal instruction.
>>>> 
>>>> 0x0000a144 in __aeabi_d2lz ()
>>>> 
>>>> Could anyone give me some suggestions? Thank you. :)
>>> 
>>> you broke it.
>>> 
>>> "illegal instruction" means that you instructed the compiler to generate
>>> processor instructions that are invalid for your processor type.
>> 
>> If the app was running (i.e. you didn't get that when you started), then it
>> can also mean that your stack was corrupted, resulting in an illegal
>> instruction on the stack. Check whether you did anything on your stack
>> that might have negative impact on stack consistency.
> 
> Stack is not supposed to contain instuctions.
> 
> But it could be that the stack got corrupted and a return went to the wrong 
> address.
> 
> I looked at my __aeabi_d2lz (in libgcc_s.so) and I couldn't find any 
> instructions that wouldn't run in most ARM processors.

Well, yes, I didn't mean to have the instruction to be on stack, but you got my point :) 

Can you debug, step, and see where it's going back?

iso