Re: [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

On Thu, 5 Sep 2019 at 11:03, Kyrill Tkachov wrote: > > Hi Christophe, > > On 9/5/19 9:30 AM, Christophe Lyon wrote: > > On Thu, 29 Aug 2019 at 17:32, Kyrill Tkachov > > wrote: > >> Hi Christophe, > >> > >> On 5/15/19 1:39 PM, Christophe Lyon wrote: > >>> Without this, when we are unwinding across

Re: [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

Christophe Lyon writes: > Sorry, I forgot again to cc: Ian. As far as I'm concerned, it's fine for architecture maintainers to approve changes to architecture-specific files in libgcc. Ian > On Thu, 5 Sep 2019 at 10:30, Christophe Lyon > wrote: >> >> On Thu, 29 Aug 2019 at 17:32, Kyrill Tk

Re: [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

Hi Christophe, On 9/5/19 9:30 AM, Christophe Lyon wrote: On Thu, 29 Aug 2019 at 17:32, Kyrill Tkachov wrote: Hi Christophe, On 5/15/19 1:39 PM, Christophe Lyon wrote: Without this, when we are unwinding across a signal frame we can jump to an even address which leads to an exception. This i

Re: [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

Sorry, I forgot again to cc: Ian. Thanks, Christophe On Thu, 5 Sep 2019 at 10:30, Christophe Lyon wrote: > > On Thu, 29 Aug 2019 at 17:32, Kyrill Tkachov > wrote: > > > > Hi Christophe, > > > > On 5/15/19 1:39 PM, Christophe Lyon wrote: > > > Without this, when we are unwinding across a signal

Re: [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

On Thu, 29 Aug 2019 at 17:32, Kyrill Tkachov wrote: > > Hi Christophe, > > On 5/15/19 1:39 PM, Christophe Lyon wrote: > > Without this, when we are unwinding across a signal frame we can jump > > to an even address which leads to an exception. > > > > This is needed in __gnu_persnality_sigframe_fd

Re: [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

Hi Christophe, On 5/15/19 1:39 PM, Christophe Lyon wrote: Without this, when we are unwinding across a signal frame we can jump to an even address which leads to an exception. This is needed in __gnu_persnality_sigframe_fdpic() when restoring the PC from the signal frame since the PC saved by t

[ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture

Without this, when we are unwinding across a signal frame we can jump to an even address which leads to an exception. This is needed in __gnu_persnality_sigframe_fdpic() when restoring the PC from the signal frame since the PC saved by the kernel has the LSB bit set to zero. 2019-XX-XX Christoph