An update on this one...I found a setting in XCode that said "Compile for
Thumb" and that one was set to true. I unchecked it and recompiled
everything and now the code doesn't stop at the same position anymore...now
I get an EXC_BAD_ACCESS on the get_hazardous_pointer...so I am still not
there but at least I cleared the hurdle I first posted about. Since thumb
instructions are 16 bits and ARM mode are 32 bits things must have not been
aligned properly and hence the BAD_INSTRUCTION exceptions. This is the call
stack right now...
#0 0x0007e0cc in get_hazardous_pointer at domain.c:276
#1 0x0007e4e8 in mono_jit_info_table_find at domain.c:370
#2 0x0020f17c in mono_get_generic_context_from_code at
mini-generic-sharing.c:26
#3 0x0020f5a8 in mono_convert_imt_slot_to_vtable_slot at
mini-trampolines.c:47
#4 0x0021044c in mono_magic_trampoline at mini-trampolines.c:348
#5 0x03904524 in method_order_end
I guess my next step is to research my hazardous_pointers....
mobbe wrote:
>
> Over the past couple of weeks I have been working with getting the Mono
> framework up and running on the iPhone and I am darn close to have it all
> working.. .I have been able to get the AOT compilation to work and was
> able this morning to startup Mono in full aot mode on the device. Big
> thanks to Zoltan Varga for helping me through all the roadblocks I ran
> into. I have been working with a SVN HEAD version that I updated last
> week sometime.
>
> Next step I took was to try to invoke some methods on classes in the
> msorlib assembly to see if I could execute managed code and this is where
> I ran into a new road block..
>
> It looks like I am only able to execute .ctor methods!? During the startup
> of Mono it creates a few exceptions (OutOfMemoryException etc..) and it
> invokes its constructor method and passes in parameters. This works just
> fine...and here it is executing managed code.
>
> However, I tried to execute the ToString() method on an instance of the
> Exception class and then the program is interrupted and stopped in the
> prolog for the function mono_get_lmf_addr.. if I continue to run the
> program
> I get a BAD_INSTRUCTION message and the whole thing shuts down...
>
> Here is the code I am trying to execute...
>
> MonoDomain * domain = mono_jit_init("");
> MonoAssembly* msCorlib = mono_domain_assembly_open (domain,"mscorlib");
> MonoImage* image = mono_assembly_get_image(msCorlib);
>
> MonoClass *klass = mono_class_from_name (image, "System", "Exception");
> MonoObject* o = mono_object_new (domain, klass);
>
> MonoMethodDesc* methodDesc =
> mono_method_desc_new("System.Object:ToString", TRUE);
> MonoMethod* toStringMethod = mono_method_desc_search_in_class(methodDesc,
> klass);
> MonoObject* result = mono_runtime_invoke(toStringMethod, o, NULL, NULL);
>
>
> I don't know if it would help you but here is the assembly where it all
> stops...
> mono_get_lmf_addr
> 0x001d5bdc <+0000> push {r4, r5, r7, lr}
> 0x001d5bde <+0002> add r7, sp, #8
> 0x001d5be0 <+0004> sub sp, #12 <-- stops here
> 0x001d5be2 <+0006> ldr r3, [pc, #76] (0x1d5c30
> <mono_get_lmf_addr+84>)
> 0x001d5be4 <+0008> add r3, pc
> 0x001d5be6 <+0010> ldr r3, [r3, #0]
> 0x001d5be8 <+0012> adds r0, r3, #0
> 0x001d5bea <+0014> bl 0x3e640 <TlsGetValue>
>
> I get the same problem if I try to run other methods on other objects or
> static methods as well...Only constructor methods seems to work.
>
> It looks to me that the stack isn't setup properly since it always throws
> the EXC_BAD_INSTRUCTION when trying to access the stack pointer.
>
> I have been banging my head against this problem for two days and right
> now I am not able to figure out how to troubleshoot this. If there is
> anyone out there that have any suggestion on how I should go about
> troubleshooting this I would really appreciate it. It stings a bit to come
> this close and not be able to cross the finish line...
>
>
> Thanks,
>
>
--
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