On Tue, Feb 6, 2018 at 3:38 AM, Richard Earnshaw (lists) <richard.earns...@arm.com> wrote: > On 02/02/18 20:55, Eric Botcazou wrote: >>> But, that is not what the builtin setjmp/longjmp tests have. >> >> Yes, but I don't think that we want to risk breaking a working compiler on >> some targets because peculiar tests don't pass on another. I think that >> init_eh is OK for x32 so SJLJ exceptions work and the issue is only with the >> undocumented builtin setjmp/longjmp. >> >> What happens on Aarch64 -milp32 for example? Would it be OK to save/restore >> only 32-bit values? And MIPS n32? >> > > No. At least, not for the frame pointer on AArch64. If the caller has > used FP as a normal register, then all 64 bits must be preserved. The > same is true of any other register that might also be used as a > non-frame-related register.
If FP is used as a normal register, it won't be saved as frame pointer in builtin jmp buffer. -- H.J.
