diff options
Diffstat (limited to 'backend/Mach.v')
| -rw-r--r-- | backend/Mach.v | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/backend/Mach.v b/backend/Mach.v index 839a25bd..9fdee9eb 100644 --- a/backend/Mach.v +++ b/backend/Mach.v @@ -156,6 +156,9 @@ Proof. unfold Regmap.set. destruct (RegEq.eq r a); auto. Qed. +Definition undef_caller_save_regs (rs: regset) : regset := + fun r => if is_callee_save r then rs r else Vundef. + Definition set_pair (p: rpair mreg) (v: val) (rs: regset) : regset := match p with | One r => rs#r <- v @@ -407,7 +410,7 @@ Inductive step: state -> trace -> state -> Prop := Genv.find_funct_ptr ge fb = Some (External ef) -> extcall_arguments rs m (parent_sp s) (ef_sig ef) args -> external_call ef ge args m t res m' -> - rs' = set_pair (loc_result (ef_sig ef)) res rs -> + rs' = set_pair (loc_result (ef_sig ef)) res (undef_caller_save_regs rs) -> step (Callstate s fb rs m) t (Returnstate s rs' m') | exec_return: |