On Mon, Nov 12, 2018 at 10:13:43PM +1030, Alan Modra wrote: > There are a few places in libgcc assembly where we don't emit call > frame information for functions, potentially breaking unwinding from > asynchronous signal handlers. This patch fixes most. Although I > patch tramp.S there is no attempt made to provide CFI for the actual > trampoline on the stack. Doing that would require generating CFI at > run time and both registering and deregistering it, which is probably > not worth doing since it would significantly slow down the call. > > Note that the out-of-line register save/restore functions do not > need CFI in the assembly. CFI is added for them by the rs6000.c > prologue and epilogue code. > > Bootstrapped etc. powerpc64le-linux.
Okay for trunk. Thanks! Segher > * config/rs6000/morestack.S (__stack_split_initialize), > (__morestack_get_guard, __morestack_set_guard), > (__morestack_make_guard): Provide CFI covering these functions. > * config/rs6000/tramp.S (__trampoline_setup): Likewise.
