diff options
Diffstat (limited to 'arm')
| -rw-r--r-- | arm/Archi.v | 3 | ||||
| -rw-r--r-- | arm/Conventions1.v (renamed from arm/hardfloat/Conventions1.v) | 191 | ||||
| -rw-r--r-- | arm/Stacklayout.v (renamed from arm/eabi/Stacklayout.v) | 0 | ||||
| -rw-r--r-- | arm/eabi/Conventions1.v | 509 | ||||
| -rw-r--r-- | arm/extractionMachdep.v | 8 | ||||
| -rw-r--r-- | arm/hardfloat/Stacklayout.v | 132 |
6 files changed, 125 insertions, 718 deletions
diff --git a/arm/Archi.v b/arm/Archi.v index 5657f31..1306459 100644 --- a/arm/Archi.v +++ b/arm/Archi.v @@ -46,3 +46,6 @@ Definition choose_binop_pl_32 (s1: bool) (pl1: nan_pl 24) (s2: bool) (pl2: nan_p Global Opaque big_endian default_pl_64 choose_binop_pl_64 default_pl_32 choose_binop_pl_32. + +Inductive abi_kind := Softfloat | Hardfloat. +Parameter abi: abi_kind. diff --git a/arm/hardfloat/Conventions1.v b/arm/Conventions1.v index 40a761c..1689c77 100644 --- a/arm/hardfloat/Conventions1.v +++ b/arm/Conventions1.v @@ -17,6 +17,7 @@ Require Import Coqlib. Require Import AST. Require Import Events. Require Import Locations. +Require Archi. (** * Classification of machine registers *) @@ -231,7 +232,12 @@ Qed. (** The result value of a function is passed back to the caller in registers [R0] or [F0] or [R0,R1], depending on the type of the returned value. We treat a function without result as a function - with one integer result. *) + with one integer result. + + For the "softfloat" convention, results of FP types should be passed + in [R0] or [R0,R1]. This doesn't fit the CompCert register model, + so we have code in [arm/PrintAsm.ml] that inserts additional moves + to/from [F0]. *) Definition loc_result (s: signature) : list mreg := match s.(sig_res) with @@ -264,7 +270,8 @@ Qed. (** ** Location of function arguments *) -(** We use the following calling conventions, adapted from the ARM EABI-HF: +(** For the "hardfloat" configuration, we use the following calling conventions, + adapted from the ARM EABI-HF: - The first 4 integer arguments are passed in registers [R0] to [R3]. - The first 2 long integer arguments are passed in an aligned pair of two integer registers. @@ -292,32 +299,33 @@ Definition ireg_param (n: Z) : mreg := Definition freg_param (n: Z) : mreg := match list_nth_z float_param_regs n with Some r => r | None => F0 end. -Fixpoint loc_arguments_rec +Fixpoint loc_arguments_hf (tyl: list typ) (ir fr ofs: Z) {struct tyl} : list loc := match tyl with | nil => nil | (Tint | Tany32) as ty :: tys => if zlt ir 4 - then R (ireg_param ir) :: loc_arguments_rec tys (ir + 1) fr ofs - else S Outgoing ofs ty :: loc_arguments_rec tys ir fr (ofs + 1) + then R (ireg_param ir) :: loc_arguments_hf tys (ir + 1) fr ofs + else S Outgoing ofs ty :: loc_arguments_hf tys ir fr (ofs + 1) | (Tfloat | Tany64) as ty :: tys => if zlt fr 8 - then R (freg_param fr) :: loc_arguments_rec tys ir (fr + 1) ofs + then R (freg_param fr) :: loc_arguments_hf tys ir (fr + 1) ofs else let ofs := align ofs 2 in - S Outgoing ofs ty :: loc_arguments_rec tys ir fr (ofs + 2) + S Outgoing ofs ty :: loc_arguments_hf tys ir fr (ofs + 2) | Tsingle :: tys => if zlt fr 8 - then R (freg_param fr) :: loc_arguments_rec tys ir (fr + 1) ofs - else S Outgoing ofs Tsingle :: loc_arguments_rec tys ir fr (ofs + 1) + then R (freg_param fr) :: loc_arguments_hf tys ir (fr + 1) ofs + else S Outgoing ofs Tsingle :: loc_arguments_hf tys ir fr (ofs + 1) | Tlong :: tys => let ir := align ir 2 in if zlt ir 4 - then R (ireg_param (ir + 1)) :: R (ireg_param ir) :: loc_arguments_rec tys (ir + 2) fr ofs + then R (ireg_param (ir + 1)) :: R (ireg_param ir) :: loc_arguments_hf tys (ir + 2) fr ofs else let ofs := align ofs 2 in - S Outgoing (ofs + 1) Tint :: S Outgoing ofs Tint :: loc_arguments_rec tys ir fr (ofs + 2) + S Outgoing (ofs + 1) Tint :: S Outgoing ofs Tint :: loc_arguments_hf tys ir fr (ofs + 2) end. -(** For variable-argument functions, we use the default ARM EABI (not HF) +(** For the "softfloat" configuration, as well as for variable-argument functions + in the "hardfloat" configuration, we use the default ARM EABI (not HF) calling conventions: - The first 4 integer arguments are passed in registers [R0] to [R3]. - The first 2 long integer arguments are passed in an aligned pair of @@ -329,73 +337,88 @@ Fixpoint loc_arguments_rec - Extra arguments are passed on the stack, in [Outgoing] slots, consecutively assigned (1 word for an integer or single argument, 2 words for a float or a long), starting at word offset 0. -*) -Fixpoint loc_arguments_vararg +This convention is not quite that of the ARM EABI, whereas every float +argument are passed in one or two integer registers. Unfortunately, +this does not fit the data model of CompCert. In [PrintAsm.ml] +we insert additional code around function calls and returns that moves +data appropriately. *) + +Fixpoint loc_arguments_sf (tyl: list typ) (ofs: Z) {struct tyl} : list loc := match tyl with | nil => nil | (Tint|Tany32) as ty :: tys => (if zlt ofs 0 then R (ireg_param (ofs + 4)) else S Outgoing ofs ty) - :: loc_arguments_vararg tys (ofs + 1) + :: loc_arguments_sf tys (ofs + 1) | (Tfloat|Tany64) as ty :: tys => let ofs := align ofs 2 in (if zlt ofs 0 then R (freg_param (ofs + 4)) else S Outgoing ofs ty) - :: loc_arguments_vararg tys (ofs + 2) + :: loc_arguments_sf tys (ofs + 2) | Tsingle :: tys => (if zlt ofs 0 then R (freg_param (ofs + 4)) else S Outgoing ofs Tsingle) - :: loc_arguments_vararg tys (ofs + 1) + :: loc_arguments_sf tys (ofs + 1) | Tlong :: tys => let ofs := align ofs 2 in (if zlt ofs 0 then R (ireg_param (ofs+1+4)) else S Outgoing (ofs+1) Tint) :: (if zlt ofs 0 then R (ireg_param (ofs+4)) else S Outgoing ofs Tint) - :: loc_arguments_vararg tys (ofs + 2) + :: loc_arguments_sf tys (ofs + 2) end. (** [loc_arguments s] returns the list of locations where to store arguments when calling a function with signature [s]. *) Definition loc_arguments (s: signature) : list loc := - if s.(sig_cc).(cc_vararg) - then loc_arguments_vararg s.(sig_args) (-4) - else loc_arguments_rec s.(sig_args) 0 0 0. + match Archi.abi with + | Archi.Softfloat => + loc_arguments_sf s.(sig_args) (-4) + | Archi.Hardfloat => + if s.(sig_cc).(cc_vararg) + then loc_arguments_sf s.(sig_args) (-4) + else loc_arguments_hf s.(sig_args) 0 0 0 + end. (** [size_arguments s] returns the number of [Outgoing] slots used to call a function with signature [s]. *) -Fixpoint size_arguments_rec (tyl: list typ) (ir fr ofs: Z) {struct tyl} : Z := +Fixpoint size_arguments_hf (tyl: list typ) (ir fr ofs: Z) {struct tyl} : Z := match tyl with | nil => ofs | (Tint|Tany32) :: tys => if zlt ir 4 - then size_arguments_rec tys (ir + 1) fr ofs - else size_arguments_rec tys ir fr (ofs + 1) + then size_arguments_hf tys (ir + 1) fr ofs + else size_arguments_hf tys ir fr (ofs + 1) | (Tfloat|Tany64) :: tys => if zlt fr 8 - then size_arguments_rec tys ir (fr + 1) ofs - else size_arguments_rec tys ir fr (align ofs 2 + 2) + then size_arguments_hf tys ir (fr + 1) ofs + else size_arguments_hf tys ir fr (align ofs 2 + 2) | Tsingle :: tys => if zlt fr 8 - then size_arguments_rec tys ir (fr + 1) ofs - else size_arguments_rec tys ir fr (ofs + 1) + then size_arguments_hf tys ir (fr + 1) ofs + else size_arguments_hf tys ir fr (ofs + 1) | Tlong :: tys => let ir := align ir 2 in if zlt ir 4 - then size_arguments_rec tys (ir + 2) fr ofs - else size_arguments_rec tys ir fr (align ofs 2 + 2) + then size_arguments_hf tys (ir + 2) fr ofs + else size_arguments_hf tys ir fr (align ofs 2 + 2) end. -Fixpoint size_arguments_vararg (tyl: list typ) (ofs: Z) {struct tyl} : Z := +Fixpoint size_arguments_sf (tyl: list typ) (ofs: Z) {struct tyl} : Z := match tyl with | nil => Zmax 0 ofs - | (Tint | Tsingle | Tany32) :: tys => size_arguments_vararg tys (ofs + 1) - | (Tfloat | Tlong | Tany64) :: tys => size_arguments_vararg tys (align ofs 2 + 2) + | (Tint | Tsingle | Tany32) :: tys => size_arguments_sf tys (ofs + 1) + | (Tfloat | Tlong | Tany64) :: tys => size_arguments_sf tys (align ofs 2 + 2) end. Definition size_arguments (s: signature) : Z := - if s.(sig_cc).(cc_vararg) - then size_arguments_vararg s.(sig_args) (-4) - else size_arguments_rec s.(sig_args) 0 0 0. + match Archi.abi with + | Archi.Softfloat => + size_arguments_sf s.(sig_args) (-4) + | Archi.Hardfloat => + if s.(sig_cc).(cc_vararg) + then size_arguments_sf s.(sig_args) (-4) + else size_arguments_hf s.(sig_args) 0 0 0 + end. (** Argument locations are either non-temporary registers or [Outgoing] stack slots at nonnegative offsets. *) @@ -423,9 +446,9 @@ Proof. simpl; auto. Qed. -Remark loc_arguments_rec_charact: +Remark loc_arguments_hf_charact: forall tyl ir fr ofs l, - In l (loc_arguments_rec tyl ir fr ofs) -> + In l (loc_arguments_hf tyl ir fr ofs) -> match l with | R r => In r int_param_regs \/ In r float_param_regs | S Outgoing ofs' ty => ofs' >= ofs /\ ty <> Tlong @@ -447,7 +470,7 @@ Proof. { intros. destruct l; auto. destruct sl; auto. intuition omega. } - induction tyl; simpl loc_arguments_rec; intros. + induction tyl; simpl loc_arguments_hf; intros. elim H. destruct a. - (* int *) @@ -494,9 +517,9 @@ Proof. apply Zle_trans with (align ofs 2). apply align_le; omega. omega. Qed. -Remark loc_arguments_vararg_charact: +Remark loc_arguments_sf_charact: forall tyl ofs l, - In l (loc_arguments_vararg tyl ofs) -> + In l (loc_arguments_sf tyl ofs) -> match l with | R r => In r int_param_regs \/ In r float_param_regs | S Outgoing ofs' ty => ofs' >= Zmax 0 ofs /\ ty <> Tlong @@ -518,7 +541,7 @@ Proof. { intros. destruct l; auto. destruct sl; auto. intuition xomega. } - induction tyl; simpl loc_arguments_vararg; intros. + induction tyl; simpl loc_arguments_sf; intros. elim H. destruct a. - (* int *) @@ -578,20 +601,20 @@ Proof. { intros. elim H0; simpl; ElimOrEq; OrEq. } - red. destruct (cc_vararg (sig_cc s)). - exploit loc_arguments_vararg_charact; eauto. - destruct l; auto. - exploit loc_arguments_rec_charact; eauto. - destruct l; auto. + assert (In l (loc_arguments_sf (sig_args s) (-4)) -> loc_argument_acceptable l). + { intros. red. exploit loc_arguments_sf_charact; eauto. destruct l; auto. } + assert (In l (loc_arguments_hf (sig_args s) 0 0 0) -> loc_argument_acceptable l). + { intros. red. exploit loc_arguments_hf_charact; eauto. destruct l; auto. } + destruct Archi.abi; [ | destruct (cc_vararg (sig_cc s)) ]; auto. Qed. Hint Resolve loc_arguments_acceptable: locs. (** The offsets of [Outgoing] arguments are below [size_arguments s]. *) -Remark size_arguments_rec_above: +Remark size_arguments_hf_above: forall tyl ir fr ofs0, - ofs0 <= size_arguments_rec tyl ir fr ofs0. + ofs0 <= size_arguments_hf tyl ir fr ofs0. Proof. induction tyl; simpl; intros. omega. @@ -612,9 +635,9 @@ Proof. apply Zle_trans with (align ofs0 2 + 2); auto; omega. Qed. -Remark size_arguments_vararg_above: +Remark size_arguments_sf_above: forall tyl ofs0, - Zmax 0 ofs0 <= size_arguments_vararg tyl ofs0. + Zmax 0 ofs0 <= size_arguments_sf tyl ofs0. Proof. induction tyl; simpl; intros. omega. @@ -630,15 +653,18 @@ Qed. Lemma size_arguments_above: forall s, size_arguments s >= 0. Proof. - intros; unfold size_arguments. destruct (cc_vararg (sig_cc s)). - apply Zle_ge. change 0 with (Zmax 0 (-4)). apply size_arguments_vararg_above. - apply Zle_ge. apply size_arguments_rec_above. + intros; unfold size_arguments. apply Zle_ge. + assert (0 <= size_arguments_sf (sig_args s) (-4)). + { change 0 with (Zmax 0 (-4)). apply size_arguments_sf_above. } + assert (0 <= size_arguments_hf (sig_args s) 0 0 0). + { apply size_arguments_hf_above. } + destruct Archi.abi; [ | destruct (cc_vararg (sig_cc s)) ]; auto. Qed. -Lemma loc_arguments_rec_bounded: +Lemma loc_arguments_hf_bounded: forall ofs ty tyl ir fr ofs0, - In (S Outgoing ofs ty) (loc_arguments_rec tyl ir fr ofs0) -> - ofs + typesize ty <= size_arguments_rec tyl ir fr ofs0. + In (S Outgoing ofs ty) (loc_arguments_hf tyl ir fr ofs0) -> + ofs + typesize ty <= size_arguments_hf tyl ir fr ofs0. Proof. induction tyl; simpl; intros. elim H. @@ -647,77 +673,77 @@ Proof. destruct (zlt ir 4); destruct H. discriminate. eauto. - inv H. apply size_arguments_rec_above. + inv H. apply size_arguments_hf_above. eauto. - (* float *) destruct (zlt fr 8); destruct H. discriminate. eauto. - inv H. apply size_arguments_rec_above. + inv H. apply size_arguments_hf_above. eauto. - (* long *) destruct (zlt (align ir 2) 4). destruct H. discriminate. destruct H. discriminate. eauto. destruct H. inv H. - rewrite <- Zplus_assoc. simpl. apply size_arguments_rec_above. + rewrite <- Zplus_assoc. simpl. apply size_arguments_hf_above. destruct H. inv H. - eapply Zle_trans. 2: apply size_arguments_rec_above. simpl; omega. + eapply Zle_trans. 2: apply size_arguments_hf_above. simpl; omega. eauto. - (* float *) destruct (zlt fr 8); destruct H. discriminate. eauto. - inv H. apply size_arguments_rec_above. + inv H. apply size_arguments_hf_above. eauto. - (* any32 *) destruct (zlt ir 4); destruct H. discriminate. eauto. - inv H. apply size_arguments_rec_above. + inv H. apply size_arguments_hf_above. eauto. - (* any64 *) destruct (zlt fr 8); destruct H. discriminate. eauto. - inv H. apply size_arguments_rec_above. + inv H. apply size_arguments_hf_above. eauto. Qed. -Lemma loc_arguments_vararg_bounded: +Lemma loc_arguments_sf_bounded: forall ofs ty tyl ofs0, - In (S Outgoing ofs ty) (loc_arguments_vararg tyl ofs0) -> - Zmax 0 (ofs + typesize ty) <= size_arguments_vararg tyl ofs0. + In (S Outgoing ofs ty) (loc_arguments_sf tyl ofs0) -> + Zmax 0 (ofs + typesize ty) <= size_arguments_sf tyl ofs0. Proof. induction tyl; simpl; intros. elim H. destruct a. - (* int *) destruct H. - destruct (zlt ofs0 0); inv H. apply size_arguments_vararg_above. + destruct (zlt ofs0 0); inv H. apply size_arguments_sf_above. eauto. - (* float *) destruct H. - destruct (zlt (align ofs0 2) 0); inv H. apply size_arguments_vararg_above. + destruct (zlt (align ofs0 2) 0); inv H. apply size_arguments_sf_above. eauto. - (* long *) destruct H. destruct (zlt (align ofs0 2) 0); inv H. - rewrite <- Zplus_assoc. simpl. apply size_arguments_vararg_above. + rewrite <- Zplus_assoc. simpl. apply size_arguments_sf_above. destruct H. destruct (zlt (align ofs0 2) 0); inv H. - eapply Zle_trans. 2: apply size_arguments_vararg_above. simpl; xomega. + eapply Zle_trans. 2: apply size_arguments_sf_above. simpl; xomega. eauto. - (* float *) destruct H. - destruct (zlt ofs0 0); inv H. apply size_arguments_vararg_above. + destruct (zlt ofs0 0); inv H. apply size_arguments_sf_above. eauto. - (* any32 *) destruct H. - destruct (zlt ofs0 0); inv H. apply size_arguments_vararg_above. + destruct (zlt ofs0 0); inv H. apply size_arguments_sf_above. eauto. - (* any64 *) destruct H. - destruct (zlt (align ofs0 2) 0); inv H. apply size_arguments_vararg_above. + destruct (zlt (align ofs0 2) 0); inv H. apply size_arguments_sf_above. eauto. Qed. @@ -727,7 +753,18 @@ Lemma loc_arguments_bounded: ofs + typesize ty <= size_arguments s. Proof. unfold loc_arguments, size_arguments; intros. - destruct (cc_vararg (sig_cc s)). - eapply Zle_trans. 2: eapply loc_arguments_vararg_bounded; eauto. xomega. - eapply loc_arguments_rec_bounded; eauto. + assert (In (S Outgoing ofs ty) (loc_arguments_sf (sig_args s) (-4)) -> + ofs + typesize ty <= size_arguments_sf (sig_args s) (-4)). + { intros. eapply Zle_trans. 2: eapply loc_arguments_sf_bounded; eauto. xomega. } + assert (In (S Outgoing ofs ty) (loc_arguments_hf (sig_args s) 0 0 0) -> + ofs + typesize ty <= size_arguments_hf (sig_args s) 0 0 0). + { intros. eapply loc_arguments_hf_bounded; eauto. } + destruct Archi.abi; [ | destruct (cc_vararg (sig_cc s)) ]; eauto. +Qed. + +Lemma loc_arguments_main: + loc_arguments signature_main = nil. +Proof. + unfold loc_arguments. + destruct Archi.abi; reflexivity. Qed. diff --git a/arm/eabi/Stacklayout.v b/arm/Stacklayout.v index 7694dcf..7694dcf 100644 --- a/arm/eabi/Stacklayout.v +++ b/arm/Stacklayout.v diff --git a/arm/eabi/Conventions1.v b/arm/eabi/Conventions1.v deleted file mode 100644 index c26d29e..0000000 --- a/arm/eabi/Conventions1.v +++ /dev/null @@ -1,509 +0,0 @@ -(* *********************************************************************) -(* *) -(* The Compcert verified compiler *) -(* *) -(* Xavier Leroy, INRIA Paris-Rocquencourt *) -(* *) -(* Copyright Institut National de Recherche en Informatique et en *) -(* Automatique. All rights reserved. This file is distributed *) -(* under the terms of the INRIA Non-Commercial License Agreement. *) -(* *) -(* *********************************************************************) - -(** Function calling conventions and other conventions regarding the use of - machine registers and stack slots. *) - -Require Import Coqlib. -Require Import AST. -Require Import Events. -Require Import Locations. - -(** * Classification of machine registers *) - -(** Machine registers (type [mreg] in module [Locations]) are divided in - the following groups: -- Temporaries used for spilling, reloading, and parallel move operations. -- Allocatable registers, that can be assigned to RTL pseudo-registers. - These are further divided into: --- Callee-save registers, whose value is preserved across a function call. --- Caller-save registers that can be modified during a function call. - - We follow the PowerPC application binary interface (ABI) in our choice - of callee- and caller-save registers. -*) - -Definition int_caller_save_regs := - R0 :: R1 :: R2 :: R3 :: R12 :: nil. - -Definition float_caller_save_regs := - F0 :: F1 :: F2 :: F3 :: F4 :: F5 :: F6 :: F7 :: nil. - -Definition int_callee_save_regs := - R4 :: R5 :: R6 :: R7 :: R8 :: R9 :: R10 :: R11 :: nil. - -Definition float_callee_save_regs := - F8 :: F9 :: F10 :: F11 :: F12 :: F13 :: F14 :: F15 :: nil. - -Definition destroyed_at_call := - int_caller_save_regs ++ float_caller_save_regs. - -Definition dummy_int_reg := R0. (**r Used in [Coloring]. *) -Definition dummy_float_reg := F0. (**r Used in [Coloring]. *) - -(** The [index_int_callee_save] and [index_float_callee_save] associate - a unique positive integer to callee-save registers. This integer is - used in [Stacking] to determine where to save these registers in - the activation record if they are used by the current function. *) - -Definition index_int_callee_save (r: mreg) := - match r with - | R4 => 0 | R5 => 1 | R6 => 2 | R7 => 3 - | R8 => 4 | R9 => 5 | R10 => 6 | R11 => 7 - | _ => -1 - end. - -Definition index_float_callee_save (r: mreg) := - match r with - | F8 => 0 | F9 => 1 | F10 => 2 | F11 => 3 - | F12 => 4 | F13 => 5 | F14 => 6 | F15 => 7 - | _ => -1 - end. - -Ltac ElimOrEq := - match goal with - | |- (?x = ?y) \/ _ -> _ => - let H := fresh in - (intro H; elim H; clear H; - [intro H; rewrite <- H; clear H | ElimOrEq]) - | |- False -> _ => - let H := fresh in (intro H; contradiction) - end. - -Ltac OrEq := - match goal with - | |- (?x = ?x) \/ _ => left; reflexivity - | |- (?x = ?y) \/ _ => right; OrEq - | |- False => fail - end. - -Ltac NotOrEq := - match goal with - | |- (?x = ?y) \/ _ -> False => - let H := fresh in ( - intro H; elim H; clear H; [intro; discriminate | NotOrEq]) - | |- False -> False => - contradiction - end. - -Lemma index_int_callee_save_pos: - forall r, In r int_callee_save_regs -> index_int_callee_save r >= 0. -Proof. - intro r. simpl; ElimOrEq; unfold index_int_callee_save; omega. -Qed. - -Lemma index_float_callee_save_pos: - forall r, In r float_callee_save_regs -> index_float_callee_save r >= 0. -Proof. - intro r. simpl; ElimOrEq; unfold index_float_callee_save; omega. -Qed. - -Lemma index_int_callee_save_pos2: - forall r, index_int_callee_save r >= 0 -> In r int_callee_save_regs. -Proof. - destruct r; simpl; intro; omegaContradiction || OrEq. -Qed. - -Lemma index_float_callee_save_pos2: - forall r, index_float_callee_save r >= 0 -> In r float_callee_save_regs. -Proof. - destruct r; simpl; intro; omegaContradiction || OrEq. -Qed. - -Lemma index_int_callee_save_inj: - forall r1 r2, - In r1 int_callee_save_regs -> - In r2 int_callee_save_regs -> - r1 <> r2 -> - index_int_callee_save r1 <> index_int_callee_save r2. -Proof. - intros r1 r2. - simpl; ElimOrEq; ElimOrEq; unfold index_int_callee_save; - intros; congruence. -Qed. - -Lemma index_float_callee_save_inj: - forall r1 r2, - In r1 float_callee_save_regs -> - In r2 float_callee_save_regs -> - r1 <> r2 -> - index_float_callee_save r1 <> index_float_callee_save r2. -Proof. - intros r1 r2. - simpl; ElimOrEq; ElimOrEq; unfold index_float_callee_save; - intros; congruence. -Qed. - -(** The following lemmas show that - (temporaries, destroyed at call, integer callee-save, float callee-save) - is a partition of the set of machine registers. *) - -Lemma int_float_callee_save_disjoint: - list_disjoint int_callee_save_regs float_callee_save_regs. -Proof. - red; intros r1 r2. simpl; ElimOrEq; ElimOrEq; discriminate. -Qed. - -Lemma register_classification: - forall r, - In r destroyed_at_call \/ In r int_callee_save_regs \/ In r float_callee_save_regs. -Proof. - destruct r; - try (left; simpl; OrEq); - try (right; left; simpl; OrEq); - try (right; right; simpl; OrEq). -Qed. - - -Lemma int_callee_save_not_destroyed: - forall r, - In r destroyed_at_call -> In r int_callee_save_regs -> False. -Proof. - intros. revert H0 H. simpl. ElimOrEq; NotOrEq. -Qed. - -Lemma float_callee_save_not_destroyed: - forall r, - In r destroyed_at_call -> In r float_callee_save_regs -> False. -Proof. - intros. revert H0 H. simpl. ElimOrEq; NotOrEq. -Qed. - -Lemma int_callee_save_type: - forall r, In r int_callee_save_regs -> mreg_type r = Tany32. -Proof. - intro. simpl; ElimOrEq; reflexivity. -Qed. - -Lemma float_callee_save_type: - forall r, In r float_callee_save_regs -> mreg_type r = Tany64. -Proof. - intro. simpl; ElimOrEq; reflexivity. -Qed. - -Ltac NoRepet := - match goal with - | |- list_norepet nil => - apply list_norepet_nil - | |- list_norepet (?a :: ?b) => - apply list_norepet_cons; [simpl; intuition discriminate | NoRepet] - end. - -Lemma int_callee_save_norepet: - list_norepet int_callee_save_regs. -Proof. - unfold int_callee_save_regs; NoRepet. -Qed. - -Lemma float_callee_save_norepet: - list_norepet float_callee_save_regs. -Proof. - unfold float_callee_save_regs; NoRepet. -Qed. - -(** * Function calling conventions *) - -(** The functions in this section determine the locations (machine registers - and stack slots) used to communicate arguments and results between the - caller and the callee during function calls. These locations are functions - of the signature of the function and of the call instruction. - Agreement between the caller and the callee on the locations to use - is guaranteed by our dynamic semantics for Cminor and RTL, which demand - that the signature of the call instruction is identical to that of the - called function. - - Calling conventions are largely arbitrary: they must respect the properties - proved in this section (such as no overlapping between the locations - of function arguments), but this leaves much liberty in choosing actual - locations. *) - -(** ** Location of function result *) - -(** The result value of a function is passed back to the caller in - registers [R0] or [F0] or [R0,R1], depending on the type of the - returned value. We treat a function without result as a function - with one integer result. *) - -Definition loc_result (s: signature) : list mreg := - match s.(sig_res) with - | None => R0 :: nil - | Some (Tint | Tany32) => R0 :: nil - | Some (Tfloat | Tsingle | Tany64) => F0 :: nil - | Some Tlong => R1 :: R0 :: nil - end. - -(** The result registers have types compatible with that given in the signature. *) - -Lemma loc_result_type: - forall sig, - subtype_list (proj_sig_res' sig) (map mreg_type (loc_result sig)) = true. -Proof. - intros. unfold proj_sig_res', loc_result. destruct (sig_res sig) as [[]|]; auto. -Qed. - -(** The result locations are caller-save registers *) - -Lemma loc_result_caller_save: - forall (s: signature) (r: mreg), - In r (loc_result s) -> In r destroyed_at_call. -Proof. - intros. - assert (r = R0 \/ r = R1 \/ r = F0). - unfold loc_result in H. destruct (sig_res s); [destruct t|idtac]; simpl in H; intuition. - destruct H0 as [A | [A | A]]; subst r; simpl; OrEq. -Qed. - -(** ** Location of function arguments *) - -(** We use the following calling conventions, adapted from the ARM EABI: -- The first 4 integer arguments are passed in registers [R0] to [R3]. -- The first 2 double float arguments are passed in registers [F0] and [F2]. -- The first 4 single float arguments are passed in registers [F0] to [F3]. -- The first 2 long integer arguments are passed in an aligned pair of - two integer registers. -- Each double argument passed in a float register ``consumes'' an aligned pair - of two integer registers. -- Each single argument passed in a float register ``consumes'' an integer - register. -- Extra arguments are passed on the stack, in [Outgoing] slots, consecutively - assigned (1 word for an integer or single argument, 2 words for a double - or a long), starting at word offset 0. - -This convention is not quite that of the ARM EABI, whereas every float -argument are passed in one or two integer registers. Unfortunately, -this does not fit the data model of CompCert. In [PrintAsm.ml] -we insert additional code around function calls and returns that moves -data appropriately. *) - -Definition ireg_param (n: Z) : mreg := - if zeq n (-4) then R0 - else if zeq n (-3) then R1 - else if zeq n (-2) then R2 - else R3. - -Definition freg_param (n: Z) : mreg := - if zeq n (-4) then F0 else F2. - -Definition sreg_param (n: Z) : mreg := - if zeq n (-4) then F0 - else if zeq n (-3) then F1 - else if zeq n (-2) then F2 - else F3. - -Fixpoint loc_arguments_rec (tyl: list typ) (ofs: Z) {struct tyl} : list loc := - match tyl with - | nil => nil - | (Tint | Tany32) as ty :: tys => - (if zle 0 ofs then S Outgoing ofs ty else R (ireg_param ofs)) - :: loc_arguments_rec tys (ofs + 1) - | (Tfloat | Tany64) as ty :: tys => - let ofs := align ofs 2 in - (if zle 0 ofs then S Outgoing ofs ty else R (freg_param ofs)) - :: loc_arguments_rec tys (ofs + 2) - | Tsingle :: tys => - (if zle 0 ofs then S Outgoing ofs Tsingle else R (sreg_param ofs)) - :: loc_arguments_rec tys (ofs + 1) - | Tlong :: tys => - let ofs := align ofs 2 in - (if zle 0 ofs then S Outgoing (ofs + 1) Tint else R (ireg_param (ofs + 1))) - :: (if zle 0 ofs then S Outgoing ofs Tint else R (ireg_param ofs)) - :: loc_arguments_rec tys (ofs + 2) - end. - -(** [loc_arguments s] returns the list of locations where to store arguments - when calling a function with signature [s]. *) - -Definition loc_arguments (s: signature) : list loc := - loc_arguments_rec s.(sig_args) (-4). - -(** [size_arguments s] returns the number of [Outgoing] slots used - to call a function with signature [s]. *) - -Fixpoint size_arguments_rec (tyl: list typ) (ofs: Z) {struct tyl} : Z := - match tyl with - | nil => ofs - | (Tint | Tsingle | Tany32) :: tys => size_arguments_rec tys (ofs + 1) - | (Tfloat | Tlong | Tany64) :: tys => size_arguments_rec tys (align ofs 2 + 2) - end. - -Definition size_arguments (s: signature) : Z := - Zmax 0 (size_arguments_rec s.(sig_args) (-4)). - -(** Argument locations are either non-temporary registers or [Outgoing] - stack slots at nonnegative offsets. *) - -Definition loc_argument_acceptable (l: loc) : Prop := - match l with - | R r => In r destroyed_at_call - | S Outgoing ofs ty => ofs >= 0 /\ ty <> Tlong - | _ => False - end. - -Remark ireg_param_caller_save: - forall n, In (ireg_param n) destroyed_at_call. -Proof. - unfold ireg_param; intros. - destruct (zeq n (-4)). simpl; auto. - destruct (zeq n (-3)). simpl; auto. - destruct (zeq n (-2)); simpl; auto. -Qed. - -Remark freg_param_caller_save: - forall n, In (freg_param n) destroyed_at_call. -Proof. - unfold freg_param; intros. destruct (zeq n (-4)); simpl; OrEq. -Qed. - -Remark sreg_param_caller_save: - forall n, In (sreg_param n) destroyed_at_call. -Proof. - unfold sreg_param; intros. - destruct (zeq n (-4)). simpl; tauto. - destruct (zeq n (-3)). simpl; tauto. - destruct (zeq n (-2)); simpl; tauto. -Qed. - -Remark loc_arguments_rec_charact: - forall tyl ofs l, - In l (loc_arguments_rec tyl ofs) -> - match l with - | R r => In r destroyed_at_call - | S Outgoing ofs' ty => ofs' >= 0 /\ ofs <= ofs' /\ ty <> Tlong - | S _ _ _ => False - end. -Proof. - induction tyl; simpl loc_arguments_rec; intros. - elim H. - destruct a. -- (* Tint *) - destruct H. - subst l. destruct (zle 0 ofs). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tfloat *) - assert (ofs <= align ofs 2) by (apply align_le; omega). - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. auto. congruence. - apply freg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tlong *) - assert (ofs <= align ofs 2) by (apply align_le; omega). - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tsingle *) - destruct H. - subst l. destruct (zle 0 ofs). - split. omega. split. omega. congruence. - apply sreg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tany32 *) - destruct H. - subst l. destruct (zle 0 ofs). - split. omega. split. omega. congruence. - apply ireg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -- (* Tany64 *) - assert (ofs <= align ofs 2) by (apply align_le; omega). - destruct H. - subst l. destruct (zle 0 (align ofs 2)). - split. omega. split. auto. congruence. - apply freg_param_caller_save. - exploit IHtyl; eauto. destruct l; auto. destruct sl; auto. intuition omega. -Qed. - -Lemma loc_arguments_acceptable: - forall (s: signature) (r: loc), - In r (loc_arguments s) -> loc_argument_acceptable r. -Proof. - unfold loc_arguments, loc_argument_acceptable; intros. - generalize (loc_arguments_rec_charact _ _ _ H). - destruct r; auto. - destruct sl; auto. - tauto. -Qed. -Hint Resolve loc_arguments_acceptable: locs. - -(** The offsets of [Outgoing] arguments are below [size_arguments s]. *) - -Remark size_arguments_rec_above: - forall tyl ofs, - ofs <= size_arguments_rec tyl ofs. -Proof. - induction tyl; simpl; intros. - omega. - destruct a. - apply Zle_trans with (ofs + 1); auto; omega. - assert (ofs <= align ofs 2) by (apply align_le; omega). - apply Zle_trans with (align ofs 2 + 2); auto; omega. - assert (ofs <= align ofs 2) by (apply align_le; omega). - apply Zle_trans with (align ofs 2 + 2); auto; omega. - apply Zle_trans with (ofs + 1); auto; omega. - apply Zle_trans with (ofs + 1); auto; omega. - assert (ofs <= align ofs 2) by (apply align_le; omega). - apply Zle_trans with (align ofs 2 + 2); auto; omega. -Qed. - -Lemma size_arguments_above: - forall s, size_arguments s >= 0. -Proof. - intros; unfold size_arguments. apply Zle_ge. apply Zmax1. -Qed. - -Lemma loc_arguments_bounded: - forall (s: signature) (ofs: Z) (ty: typ), - In (S Outgoing ofs ty) (loc_arguments s) -> - ofs + typesize ty <= size_arguments s. -Proof. - intros. - assert (forall tyl ofs0, - 0 <= ofs0 -> - ofs0 <= Zmax 0 (size_arguments_rec tyl ofs0)). - { - intros. generalize (size_arguments_rec_above tyl ofs0). intros. - rewrite Zmax_spec. rewrite zlt_false. auto. omega. - } - assert (forall tyl ofs0, - In (S Outgoing ofs ty) (loc_arguments_rec tyl ofs0) -> - ofs + typesize ty <= Zmax 0 (size_arguments_rec tyl ofs0)). - { - induction tyl; simpl; intros. - elim H1. - destruct a. - - (* Tint *) - destruct H1; auto. destruct (zle 0 ofs0); inv H1. apply H0. omega. - - (* Tfloat *) - destruct H1; auto. destruct (zle 0 (align ofs0 2)); inv H1. apply H0. omega. - - (* Tlong *) - destruct H1. - destruct (zle 0 (align ofs0 2)); inv H1. - eapply Zle_trans. 2: apply H0. simpl typesize; omega. omega. - destruct H1; auto. - destruct (zle 0 (align ofs0 2)); inv H1. - eapply Zle_trans. 2: apply H0. simpl typesize; omega. omega. - - (* Tsingle *) - destruct H1; auto. destruct (zle 0 ofs0); inv H1. apply H0. omega. - - (* Tany32 *) - destruct H1; auto. destruct (zle 0 ofs0); inv H1. apply H0. omega. - - (* Tany64 *) - destruct H1; auto. destruct (zle 0 (align ofs0 2)); inv H1. apply H0. omega. - } - unfold size_arguments. apply H1. auto. -Qed. diff --git a/arm/extractionMachdep.v b/arm/extractionMachdep.v index f6e17ba..0c9b705 100644 --- a/arm/extractionMachdep.v +++ b/arm/extractionMachdep.v @@ -16,3 +16,11 @@ Extract Constant Asm.ireg_eq => "fun (x: ireg) (y: ireg) -> x = y". Extract Constant Asm.freg_eq => "fun (x: freg) (y: freg) -> x = y". Extract Constant Asm.preg_eq => "fun (x: preg) (y: preg) -> x = y". + +(* Choice of calling conventions *) +Extract Constant Archi.abi => + "begin match Configuration.variant with + | ""eabi"" -> Softfloat + | ""hardfloat"" -> Hardfloat + | _ -> assert false + end". diff --git a/arm/hardfloat/Stacklayout.v b/arm/hardfloat/Stacklayout.v deleted file mode 100644 index 7694dcf..0000000 --- a/arm/hardfloat/Stacklayout.v +++ /dev/null @@ -1,132 +0,0 @@ -(* *********************************************************************) -(* *) -(* The Compcert verified compiler *) -(* *) -(* Xavier Leroy, INRIA Paris-Rocquencourt *) -(* *) -(* Copyright Institut National de Recherche en Informatique et en *) -(* Automatique. All rights reserved. This file is distributed *) -(* under the terms of the INRIA Non-Commercial License Agreement. *) -(* *) -(* *********************************************************************) - -(** Machine- and ABI-dependent layout information for activation records. *) - -Require Import Coqlib. -Require Import Bounds. - -(** The general shape of activation records is as follows, - from bottom (lowest offsets) to top: -- Space for outgoing arguments to function calls. -- Local stack slots. -- Saved values of integer callee-save registers used by the function. -- Saved values of float callee-save registers used by the function. -- Saved return address into caller. -- Pointer to activation record of the caller. -- Space for the stack-allocated data declared in Cminor. - -The [frame_env] compilation environment records the positions of -the boundaries between areas in the frame part. -*) - -Definition fe_ofs_arg := 0. - -Record frame_env : Type := mk_frame_env { - fe_size: Z; - fe_ofs_link: Z; - fe_ofs_retaddr: Z; - fe_ofs_local: Z; - fe_ofs_int_callee_save: Z; - fe_num_int_callee_save: Z; - fe_ofs_float_callee_save: Z; - fe_num_float_callee_save: Z; - fe_stack_data: Z -}. - -(** Computation of the frame environment from the bounds of the current - function. *) - -Definition make_env (b: bounds) := - let ol := align (4 * b.(bound_outgoing)) 8 in (* locals *) - let oics := ol + 4 * b.(bound_local) in (* integer callee-saves *) - let oendi := oics + 4 * b.(bound_int_callee_save) in - let ofcs := align oendi 8 in (* float callee-saves *) - let ora := ofcs + 8 * b.(bound_float_callee_save) in (* retaddr *) - let olink := ora + 4 in (* back link *) - let ostkdata := olink + 4 in (* stack data *) - let sz := align (ostkdata + b.(bound_stack_data)) 8 in - mk_frame_env sz olink ora ol - oics b.(bound_int_callee_save) - ofcs b.(bound_float_callee_save) - ostkdata. - -(** Separation property *) - -Remark frame_env_separated: - forall b, - let fe := make_env b in - 0 <= fe_ofs_arg - /\ fe_ofs_arg + 4 * b.(bound_outgoing) <= fe.(fe_ofs_local) - /\ fe.(fe_ofs_local) + 4 * b.(bound_local) <= fe.(fe_ofs_int_callee_save) - /\ fe.(fe_ofs_int_callee_save) + 4 * b.(bound_int_callee_save) <= fe.(fe_ofs_float_callee_save) - /\ fe.(fe_ofs_float_callee_save) + 8 * b.(bound_float_callee_save) <= fe.(fe_ofs_retaddr) - /\ fe.(fe_ofs_retaddr) + 4 <= fe.(fe_ofs_link) - /\ fe.(fe_ofs_link) + 4 <= fe.(fe_stack_data) - /\ fe.(fe_stack_data) + b.(bound_stack_data) <= fe.(fe_size). -Proof. - intros. - generalize (align_le (4 * bound_outgoing b) 8 (refl_equal)). - generalize (align_le (fe_ofs_int_callee_save fe + 4 * b.(bound_int_callee_save)) 8 (refl_equal _)). - generalize (align_le (fe_stack_data fe + b.(bound_stack_data)) 8 (refl_equal)). - unfold fe, make_env, fe_size, fe_ofs_link, fe_ofs_retaddr, - fe_ofs_local, fe_ofs_int_callee_save, fe_num_int_callee_save, - fe_ofs_float_callee_save, fe_num_float_callee_save, - fe_stack_data, fe_ofs_arg. - intros. - generalize (bound_local_pos b); intro; - generalize (bound_int_callee_save_pos b); intro; - generalize (bound_float_callee_save_pos b); intro; - generalize (bound_outgoing_pos b); intro; - generalize (bound_stack_data_pos b); intro. - omega. -Qed. - -(** Alignment property *) - -Remark frame_env_aligned: - forall b, - let fe := make_env b in - (4 | fe.(fe_ofs_link)) - /\ (8 | fe.(fe_ofs_local)) - /\ (4 | fe.(fe_ofs_int_callee_save)) - /\ (8 | fe.(fe_ofs_float_callee_save)) - /\ (4 | fe.(fe_ofs_retaddr)) - /\ (8 | fe.(fe_stack_data)) - /\ (8 | fe.(fe_size)). -Proof. - intros. - unfold fe, make_env, fe_size, fe_ofs_link, fe_ofs_retaddr, - fe_ofs_local, fe_ofs_int_callee_save, fe_num_int_callee_save, - fe_ofs_float_callee_save, fe_num_float_callee_save, - fe_stack_data. - set (x1 := 4 * bound_outgoing b). - assert (4 | x1). unfold x1; exists (bound_outgoing b); ring. - set (x2 := align x1 8). - assert (8 | x2). apply align_divides. omega. - set (x3 := x2 + 4 * bound_local b). - assert (4 | x3). apply Zdivide_plus_r. apply Zdivides_trans with 8; auto. exists 2; auto. - exists (bound_local b); ring. - set (x4 := align (x3 + 4 * bound_int_callee_save b) 8). - assert (8 | x4). apply align_divides. omega. - set (x5 := x4 + 8 * bound_float_callee_save b). - assert (8 | x5). apply Zdivide_plus_r; auto. exists (bound_float_callee_save b); ring. - assert (4 | x5). apply Zdivides_trans with 8; auto. exists 2; auto. - set (x6 := x5 + 4). - assert (4 | x6). apply Zdivide_plus_r; auto. exists 1; auto. - set (x7 := x6 + 4). - assert (8 | x7). unfold x7, x6. replace (x5 + 4 + 4) with (x5 + 8) by omega. - apply Zdivide_plus_r; auto. exists 1; auto. - set (x8 := align (x7 + bound_stack_data b) 8). - assert (8 | x8). apply align_divides. omega. - tauto. -Qed. |