> Am 14.11.2019 um 11:11 schrieb Pierre Morel <pmorel@xxxxxxxxxxxxx>: > > >> On 2019-11-13 17:12, Janosch Frank wrote: >>> On 11/13/19 1:23 PM, Pierre Morel wrote: >>> If we use multiple source of interrupts, for exemple, using SCLP console >>> to print information while using I/O interrupts or during exceptions, we >>> need to have a re-entrant register saving interruption handling. >>> >>> Instead of saving at a static place, let's save the base registers on >>> the stack. >>> >>> Note that we keep the static register saving that we need for the RESET >>> tests. >>> >>> We also care to give the handlers a pointer to the save registers in >>> case the handler needs it (fixup_pgm_int needs the old psw address). >> So you're still ignoring the FPRs... >> I disassembled a test and looked at all stds and it looks like printf >> and related functions use them. Wouldn't we overwrite test FPRs if >> printing in a handler? > > If printf uses the FPRs in my opinion we should modify the compilation options for the library. > > What is the reason for printf and related functions to use floating point? > Register spilling. This can and will be done. Cheers. > I will have a deeper look at this. > > > Regards, > > Pierre > > > -- > Pierre Morel > IBM Lab Boeblingen >
