Re: [Qemu-devel] [PATCH] target-openrisc: Fix exception handling status registers

[Richard Henderson <rth@twiddle.net>]

On 02/08/2017 06:01 AM, Stafford Horne wrote:
> On Mon, Feb 06, 2017 at 09:53:26PM -0800, Richard Henderson wrote:
>> On 02/01/2017 02:04 AM, Stafford Horne wrote:
>>> For kernel builds I have created toolchain binaries here:
>>>
>>>   http://shorne.noip.me/crosstool/files/bin/x86_64/5.4.0/
>>>
>>> These should work.
>>
>> This gdb crashes on the first "stepi" that I issue.  To reproduce,
>>
>> $ cat z.c
>> int main() { return 0; }
>> $ or1k-musl-linux-gcc -g z.c
>> $ qemu-or32 -g 10001 ./a.out
>>
>> // another window
>>
>> $ or1k-musl-linux-gdb ./a.out
>> (gdb) target remote localhost:10001
>> // should see that the pc is at _start
>> (gdb) stepi
>> // crash
>>
>> I won't be able to debug this myself until I can build my own gdb.
>
> Hello,
>
> The gdb branch I use is the following, it is tracking very close to
> upsstream:
>
>   git@github.com:stffrdhrn/binutils-gdb.git or1k-upstream
>
> I have sent this for review to the gdb list and currently waiting on
> comments for version 4.  Most of the code is the same as in openrisc
> github. However, I have just rebased and cleaned up for upstreaming.

Thanks.  I can confirm that I have no problems building this branch.

> However, when debugging I ran into a few errors.
>
>   1. qemu aborts the program and sends SIGILL to gdb, this is caused by
>      the openrisc loop in linux-user missing handlers for EXCP_INTERRUPT
>      and EXCP_DEBUG, I patched that see below:

Yes, I fixed that on my or1k branch Monday.


r~