Hi Max,
> The testcase from the patch passes with the trunk xtensa-linux-gcc
> with windowed ABI. But with the changes in this patch a lot of tests
> that use longjmp are failing on xtensa-linux.
Interesting. I looked at the _xtensa_nonlocal_goto implementation in
libgcc/config/xtensa/lib2funcs.S, and it should work fine given it already
checks for the frame pointer to be within the bounds of a frame.
Whether we pass the virtual frame pointer or the hard frame pointer value
shouldn't matter as long as both are >= SP and < prev_SP. Maybe there
is an off by one issue in:
.Lfirstframe:
l32i a7, a6, 4 /* a7 = next */
bgeu a2, a7, .Lnextframe
> call0 and windowed ABI xtensa code are not supposed to work together.
OK so that's not an issue then.
Wilco
