diff options
Diffstat (limited to 'riscV/Asm.v')
| -rw-r--r-- | riscV/Asm.v | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/riscV/Asm.v b/riscV/Asm.v index 4cd3b1fd..6d223c1d 100644 --- a/riscV/Asm.v +++ b/riscV/Asm.v @@ -1013,6 +1013,15 @@ Definition preg_of (r: mreg) : preg := | Machregs.F28 => F28 | Machregs.F29 => F29 | Machregs.F30 => F30 | Machregs.F31 => F31 end. +(** Undefine all registers except SP and callee-save registers *) + +Definition undef_caller_save_regs (rs: regset) : regset := + fun r => + if preg_eq r SP + || In_dec preg_eq r (List.map preg_of (List.filter is_callee_save all_mregs)) + then rs r + else Vundef. + (** Extract the values of the arguments of an external call. We exploit the calling conventions from module [Conventions], except that we use RISC-V registers instead of locations. *) @@ -1073,7 +1082,7 @@ Inductive step: state -> trace -> state -> Prop := Genv.find_funct_ptr ge b = Some (External ef) -> external_call ef ge args m t res m' -> extcall_arguments rs m (ef_sig ef) args -> - rs' = (set_pair (loc_external_result (ef_sig ef) ) res rs)#PC <- (rs RA) -> + rs' = (set_pair (loc_external_result (ef_sig ef) ) res (undef_caller_save_regs rs))#PC <- (rs RA) -> step (State rs m) t (State rs' m'). End RELSEM. |