Hi, Is it possible to reserve any other general purpose registers? Nisal On Wed, May 31, 2017 at 8:37 AM, Richard Earnshaw (lists) <Richard.Earnshaw@xxxxxxx> wrote: > On 31/05/17 00:34, Nisal Menuka wrote: >> Hi, >> I would like to reserve some registers in ARM64 processor and prohibit >> the compiler from using them in any scenario. >> >> For example: ARM64 Thirty-one 64-bit general-purpose registers X0-X30. >> I want to reserve register X30, and make sure when I compile any code >> using gcc, it won't use register X30 in any situation. >> > > You can't reserve x30, it's the link register and clobbered by call > instructions. > > R. > >> How can this be done? Any help would be greatly appreciated. >> >> Thanks, >> Nisal >> >
