[PATCH] Use ptr_mode to save/restore pointers in builtin jmpbuf

[Richard Earnshaw (lists)]

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.

R.