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").
Thanks.
--
Chen Gang (陈刚)
Managing Natural Environments is the Duty of Human Beings.
