On 5/30/16 21:32, Chen Gang wrote:
> On 5/30/16 03:18, Mike Stump wrote:
>> On May 29, 2016, at 3:39 AM, cheng...@emindsoft.com.cn wrote:
>>>
>>> r10 may also be as parameter for the nested function, so need save it
>>> before call mcount.
>>
>> mcount can have a special abi where it preserves more registers than one
>> would otherwise expect. I'm wondering if you know what registers it saves
>> or doesn't touch? Does this fix any bug found by running tests, or just by
>> inspection?
>>
>
> It is about Bug71331, which I reported yesterday.
>
> For nested function, r10 is treated as the stack pointer for parameters,
> mcount really save r10, but tilegx also use r10 to save lr, so cause
> this issue ("move r10, lr; jal __mcount").
>
> What I have done just like gcc x86 has done ("push r10; callq mcount").
>
After this patch, nested-func-4.c can passes compiling and running under
tilegx qemu. :-)
Thanks.
--
Chen Gang (陈刚)
Managing Natural Environments is the Duty of Human Beings.
