[aarch64-port-dev ] C2 error on ARM sim only regardingcall to runtime from non-compiled code

[Andrew Dinn]

On 04/10/13 18:05, Andrew Haley wrote:
> On 10/04/2013 05:40 PM, Andrew Dinn wrote:
>> (gdb) x/i OptoRuntime::new_array_nozero_C
>>    0x7fb79f1f10 <OptoRuntime::new_array_nozero_C(Klass*, int,
>> JavaThread*)>:  stp      x29, x30, [sp,#-128]!
>>
>> i.e the return address is at offset 128. 
> 
> No it's not.  That's a predecrement with a writeback.

Hmm, not sure what the objection is here unless its that I omitted the
direction of my 128.

On Intel x29 is written at offset -8 (bytes) from the SP value in the
anchor -- equivalently, offset 8 bytes from the value of SP when the
routine is called.

That's where the frame code expects it (i evaluates _anchor._sp[-1]).

The above instruction writes x29 at offset -128 bytes from the value of
SP when the routine is called i.e. not where the frame code expects it.

regards,


Andrew Dinn
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