path: root/powerpc/PrintAsm.ml

(* *********************************************************************)
(*                                                                     *)
(*              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.     *)
(*                                                                     *)
(* *********************************************************************)

(* Printing PPC assembly code in asm syntax *)

open Printf
open Datatypes
open Maps
open Camlcoq
open Sections
open AST
open Memdata
open Asm
open PrintUtil
open PrintLinux
open PrintDiab

module AsmPrinter (Target : SYSTEM) =
  (struct
    include Target

(* Basic printing functions *)

let ireg_or_zero oc r =
  if r = GPR0 then output_string oc "0" else ireg oc r

let preg oc = function
  | IR r -> ireg oc r
  | FR r -> freg oc r
  | _    -> assert false

let section oc sec =
  let name = name_of_section sec in
  assert (name <> "COMM");
  fprintf oc "	%s\n" name

let print_location oc loc =
  if loc <> Cutil.no_loc then
    print_file_line oc (fst loc) (string_of_int (snd loc))


(* Handling of annotations *)

let print_annot_stmt oc txt targs args =
  if Str.string_match re_file_line txt 0 then begin
    print_file_line oc (Str.matched_group 1 txt) (Str.matched_group 2 txt)
  end else begin
    fprintf oc "%s annotation: " comment;
    PrintAnnot.print_annot_stmt preg "R1" oc txt targs args
  end

(* Printing of instructions *)

let float_literals : (int * int64) list ref = ref []
let float32_literals : (int * int32) list ref = ref []
let jumptables : (int * label list) list ref = ref []

let print_instruction oc tbl pc fallthrough = function
  | Padd(r1, r2, r3) ->
      fprintf oc "	add	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Paddc(r1, r2, r3) ->
      fprintf oc "	addc	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Padde(r1, r2, r3) ->
      fprintf oc "	adde	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Paddi(r1, r2, c) ->
      fprintf oc "	addi	%a, %a, %a\n" ireg r1 ireg_or_zero r2 constant c
  | Paddic(r1, r2, c) ->
      fprintf oc "	addic	%a, %a, %a\n" ireg r1 ireg_or_zero r2 constant c
  | Paddis(r1, r2, c) ->
      fprintf oc "	addis	%a, %a, %a\n" ireg r1 ireg_or_zero r2 constant c
  | Paddze(r1, r2) ->
      fprintf oc "	addze	%a, %a\n" ireg r1 ireg r2
  | Pallocframe(sz, ofs) ->
      assert false
  | Pand_(r1, r2, r3) ->
      fprintf oc "	and.	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pandc(r1, r2, r3) ->
      fprintf oc "	andc	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pandi_(r1, r2, c) ->
      fprintf oc "	andi.	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Pandis_(r1, r2, c) ->
      fprintf oc "	andis.	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Pb lbl ->
      fprintf oc "	b	%a\n" label (transl_label lbl)
  | Pbctr sg ->
      fprintf oc "	bctr\n"
  | Pbctrl sg ->
      fprintf oc "	bctrl\n"
  | Pbdnz lbl ->
      fprintf oc "	bdnz	%a\n" label (transl_label lbl)
  | Pbf(bit, lbl) ->
      if !Clflags.option_faligncondbranchs > 0 then
        fprintf oc "	.balign	%d\n" !Clflags.option_faligncondbranchs;
      if short_cond_branch tbl pc lbl then
        fprintf oc "	bf	%a, %a\n" crbit bit label (transl_label lbl)
      else begin
        let next = new_label() in
        fprintf oc "	bt	%a, %a\n" crbit bit label next;
        fprintf oc "	b	%a\n" label (transl_label lbl);
        fprintf oc "%a:\n" label next
      end
  | Pbl(s, sg) ->
      fprintf oc "	bl	%a\n" symbol s
  | Pbs(s, sg) ->
      fprintf oc "	b	%a\n" symbol s
  | Pblr ->
      fprintf oc "	blr\n"
  | Pbt(bit, lbl) ->
      if !Clflags.option_faligncondbranchs > 0 then
        fprintf oc "	.balign	%d\n" !Clflags.option_faligncondbranchs;
      if short_cond_branch tbl pc lbl then
        fprintf oc "	bt	%a, %a\n" crbit bit label (transl_label lbl)
      else begin
        let next = new_label() in
        fprintf oc "	bf	%a, %a\n" crbit bit label next;
        fprintf oc "	b	%a\n" label (transl_label lbl);
        fprintf oc "%a:\n" label next
      end
  | Pbtbl(r, tbl) ->
      let lbl = new_label() in
      fprintf oc "%s begin pseudoinstr btbl(%a)\n" comment ireg r;
      fprintf oc "%s jumptable [ " comment;
      List.iter (fun l -> fprintf oc "%a " label (transl_label l)) tbl;
      fprintf oc "]\n";
      fprintf oc "	slwi    %a, %a, 2\n" ireg GPR12 ireg r;
      fprintf oc "	addis	%a, %a, %a\n" ireg GPR12 ireg GPR12 label_high lbl;
      fprintf oc "	lwz	%a, %a(%a)\n" ireg GPR12 label_low lbl ireg GPR12;
      fprintf oc "	mtctr	%a\n" ireg GPR12;
      fprintf oc "	bctr\n";
      jumptables := (lbl, tbl) :: !jumptables;
      fprintf oc "%s end pseudoinstr btbl\n" comment
  | Pcmplw(r1, r2) ->
      fprintf oc "	cmplw	%a, %a, %a\n" creg 0 ireg r1 ireg r2
  | Pcmplwi(r1, c) ->
      fprintf oc "	cmplwi	%a, %a, %a\n" creg 0 ireg r1 constant c
  | Pcmpw(r1, r2) ->
      fprintf oc "	cmpw	%a, %a, %a\n" creg 0 ireg r1 ireg r2
  | Pcmpwi(r1, c) ->
      fprintf oc "	cmpwi	%a, %a, %a\n" creg 0 ireg r1 constant c
  | Pcntlz(r1, r2) ->
      fprintf oc "	cntlz	%a, %a\n" ireg r1 ireg r2
  | Pcreqv(c1, c2, c3) ->
      fprintf oc "	creqv	%a, %a, %a\n" crbit c1 crbit c2 crbit c3
  | Pcror(c1, c2, c3) ->
      fprintf oc "	cror	%a, %a, %a\n" crbit c1 crbit c2 crbit c3
  | Pcrxor(c1, c2, c3) ->
      fprintf oc "	crxor	%a, %a, %a\n" crbit c1 crbit c2 crbit c3
  | Pdivw(r1, r2, r3) ->
      fprintf oc "	divw	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pdivwu(r1, r2, r3) ->
      fprintf oc "	divwu	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Peieio ->
      fprintf oc "	eieio\n"
  | Peqv(r1, r2, r3) ->
      fprintf oc "	eqv	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pextsb(r1, r2) ->
      fprintf oc "	extsb	%a, %a\n" ireg r1 ireg r2
  | Pextsh(r1, r2) ->
      fprintf oc "	extsh	%a, %a\n" ireg r1 ireg r2
  | Pfreeframe(sz, ofs) ->
      assert false
  | Pfabs(r1, r2) | Pfabss(r1, r2) ->
      fprintf oc "	fabs	%a, %a\n" freg r1 freg r2
  | Pfadd(r1, r2, r3) ->
      fprintf oc "	fadd	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfadds(r1, r2, r3) ->
      fprintf oc "	fadds	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfcmpu(r1, r2) ->
      fprintf oc "	fcmpu	%a, %a, %a\n" creg 0 freg r1 freg r2
  | Pfcti(r1, r2) ->
      assert false
  | Pfctiw(r1, r2) ->
      fprintf oc "	fctiw	%a, %a\n" freg r1 freg r2
  | Pfctiwz(r1, r2) ->
      fprintf oc "	fctiwz	%a, %a\n" freg r1 freg r2
  | Pfdiv(r1, r2, r3) ->
      fprintf oc "	fdiv	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfdivs(r1, r2, r3) ->
      fprintf oc "	fdivs	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfmake(rd, r1, r2) ->
      assert false
  | Pfmr(r1, r2) ->
      fprintf oc "	fmr	%a, %a\n" freg r1 freg r2
  | Pfmul(r1, r2, r3) ->
      fprintf oc "	fmul	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfmuls(r1, r2, r3) ->
      fprintf oc "	fmuls	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfneg(r1, r2) | Pfnegs(r1, r2) ->
      fprintf oc "	fneg	%a, %a\n" freg r1 freg r2
  | Pfrsp(r1, r2) ->
      fprintf oc "	frsp	%a, %a\n" freg r1 freg r2
  | Pfxdp(r1, r2) ->
      assert false
  | Pfsub(r1, r2, r3) ->
      fprintf oc "	fsub	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfsubs(r1, r2, r3) ->
      fprintf oc "	fsubs	%a, %a, %a\n" freg r1 freg r2 freg r3
  | Pfmadd(r1, r2, r3, r4) ->
      fprintf oc "	fmadd	%a, %a, %a, %a\n" freg r1 freg r2 freg r3 freg r4
  | Pfmsub(r1, r2, r3, r4) ->
      fprintf oc "	fmsub	%a, %a, %a, %a\n" freg r1 freg r2 freg r3 freg r4
  | Pfnmadd(r1, r2, r3, r4) ->
      fprintf oc "	fnmadd	%a, %a, %a, %a\n" freg r1 freg r2 freg r3 freg r4
  | Pfnmsub(r1, r2, r3, r4) ->
      fprintf oc "	fnmsub	%a, %a, %a, %a\n" freg r1 freg r2 freg r3 freg r4
  | Pfsqrt(r1, r2) ->
      fprintf oc "	fsqrt	%a, %a\n" freg r1 freg r2    
  | Pfrsqrte(r1, r2) ->
      fprintf oc "	frsqrte	%a, %a\n" freg r1 freg r2    
  | Pfres(r1, r2) ->
      fprintf oc "	fres	%a, %a\n" freg r1 freg r2    
  | Pfsel(r1, r2, r3, r4) ->
      fprintf oc "	fsel	%a, %a, %a, %a\n" freg r1 freg r2 freg r3 freg r4
  | Pisync ->
      fprintf oc "	isync\n"
  | Plbz(r1, c, r2) ->
      fprintf oc "	lbz	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Plbzx(r1, r2, r3) ->
      fprintf oc "	lbzx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Plfd(r1, c, r2)  | Plfd_a(r1, c, r2) ->
      fprintf oc "	lfd	%a, %a(%a)\n" freg r1 constant c ireg r2
  | Plfdx(r1, r2, r3) | Plfdx_a(r1, r2, r3) ->
      fprintf oc "	lfdx	%a, %a, %a\n" freg r1 ireg r2 ireg r3
  | Plfs(r1, c, r2) ->
      fprintf oc "	lfs	%a, %a(%a)\n" freg r1 constant c ireg r2
  | Plfsx(r1, r2, r3) ->
      fprintf oc "	lfsx	%a, %a, %a\n" freg r1 ireg r2 ireg r3
  | Plha(r1, c, r2) ->
      fprintf oc "	lha	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Plhax(r1, r2, r3) ->
      fprintf oc "	lhax	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Plhbrx(r1, r2, r3) ->
      fprintf oc "	lhbrx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Plhz(r1, c, r2) ->
      fprintf oc "	lhz	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Plhzx(r1, r2, r3) ->
      fprintf oc "	lhzx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Plfi(r1, c) ->
      let lbl = new_label() in
      fprintf oc "	addis	%a, 0, %a\n" ireg GPR12 label_high lbl;
      fprintf oc "	lfd	%a, %a(%a) %s %.18g\n" freg r1 label_low lbl ireg GPR12 comment (camlfloat_of_coqfloat c);
      float_literals := (lbl, camlint64_of_coqint (Floats.Float.to_bits c)) :: !float_literals;
  | Plfis(r1, c) ->
      let lbl = new_label() in
      fprintf oc "	addis	%a, 0, %a\n" ireg GPR12 label_high lbl;
      fprintf oc "	lfs	%a, %a(%a) %s %.18g\n" freg r1 label_low lbl ireg GPR12 comment (camlfloat_of_coqfloat32 c);
      float32_literals := (lbl, camlint_of_coqint (Floats.Float32.to_bits c)) :: !float32_literals;
  | Plwarx(r1, r2, r3) ->
      fprintf oc "	lwarx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Plwbrx(r1, r2, r3) ->
      fprintf oc "	lwbrx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Plwz(r1, c, r2) | Plwz_a(r1, c, r2) ->
      fprintf oc "	lwz	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Plwzu(r1, c, r2) ->
      fprintf oc "	lwzu	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Plwzx(r1, r2, r3) | Plwzx_a(r1, r2, r3) ->
      fprintf oc "	lwzx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pmfcr(r1) ->
      fprintf oc "	mfcr	%a\n" ireg r1
  | Pmfcrbit(r1, bit) ->
      assert false
  | Pmflr(r1) ->
      fprintf oc "	mflr	%a\n" ireg r1
  | Pmr(r1, r2) ->
      fprintf oc "	mr	%a, %a\n" ireg r1 ireg r2
  | Pmtctr(r1) ->
      fprintf oc "	mtctr	%a\n" ireg r1
  | Pmtlr(r1) ->
      fprintf oc "	mtlr	%a\n" ireg r1
  | Pmulli(r1, r2, c) ->
      fprintf oc "	mulli	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Pmullw(r1, r2, r3) ->
      fprintf oc "	mullw	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pmulhw(r1, r2, r3) ->
      fprintf oc "	mulhw	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pmulhwu(r1, r2, r3) ->
      fprintf oc "	mulhwu	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pnand(r1, r2, r3) ->
      fprintf oc "	nand	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pnor(r1, r2, r3) ->
      fprintf oc "	nor	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Por(r1, r2, r3) ->
      fprintf oc "	or	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Porc(r1, r2, r3) ->
      fprintf oc "	orc	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pori(r1, r2, c) ->
      fprintf oc "	ori	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Poris(r1, r2, c) ->
      fprintf oc "	oris	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Prlwinm(r1, r2, c1, c2) ->
      let (mb, me) = rolm_mask (camlint_of_coqint c2) in
      fprintf oc "	rlwinm	%a, %a, %ld, %d, %d %s 0x%lx\n"
                ireg r1 ireg r2 (camlint_of_coqint c1) mb me
                comment (camlint_of_coqint c2)
  | Prlwimi(r1, r2, c1, c2) ->
      let (mb, me) = rolm_mask (camlint_of_coqint c2) in
      fprintf oc "	rlwimi	%a, %a, %ld, %d, %d %s 0x%lx\n"
                ireg r1 ireg r2 (camlint_of_coqint c1) mb me
                comment (camlint_of_coqint c2)
  | Pslw(r1, r2, r3) ->
      fprintf oc "	slw	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Psraw(r1, r2, r3) ->
      fprintf oc "	sraw	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Psrawi(r1, r2, c) ->
      fprintf oc "	srawi	%a, %a, %ld\n" ireg r1 ireg r2 (camlint_of_coqint c)
  | Psrw(r1, r2, r3) ->
      fprintf oc "	srw	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pstb(r1, c, r2) ->
      fprintf oc "	stb	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Pstbx(r1, r2, r3) ->
      fprintf oc "	stbx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pstfd(r1, c, r2) | Pstfd_a(r1, c, r2) ->
      fprintf oc "	stfd	%a, %a(%a)\n" freg r1 constant c ireg r2
  | Pstfdu(r1, c, r2) ->
      fprintf oc "	stfdu	%a, %a(%a)\n" freg r1 constant c ireg r2
  | Pstfdx(r1, r2, r3) | Pstfdx_a(r1, r2, r3) ->
      fprintf oc "	stfdx	%a, %a, %a\n" freg r1 ireg r2 ireg r3
  | Pstfs(r1, c, r2) ->
      fprintf oc "	stfs	%a, %a(%a)\n" freg r1 constant c ireg r2
  | Pstfsx(r1, r2, r3) ->
      fprintf oc "	stfsx	%a, %a, %a\n" freg r1 ireg r2 ireg r3
  | Psth(r1, c, r2) ->
      fprintf oc "	sth	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Psthx(r1, r2, r3) ->
      fprintf oc "	sthx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Psthbrx(r1, r2, r3) ->
      fprintf oc "	sthbrx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pstw(r1, c, r2) | Pstw_a(r1, c, r2) ->
      fprintf oc "	stw	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Pstwu(r1, c, r2) ->
      fprintf oc "	stwu	%a, %a(%a)\n" ireg r1 constant c ireg r2
  | Pstwx(r1, r2, r3) | Pstwx_a(r1, r2, r3) ->
      fprintf oc "	stwx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pstwxu(r1, r2, r3) ->
      fprintf oc "	stwxu	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pstwbrx(r1, r2, r3) ->
      fprintf oc "	stwbrx	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pstwcx_(r1, r2, r3) ->
      fprintf oc "	stwcx.	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Psubfc(r1, r2, r3) ->
      fprintf oc "	subfc	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Psubfe(r1, r2, r3) ->
      fprintf oc "	subfe	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Psubfze(r1, r2) ->
      fprintf oc "	subfze	%a, %a\n" ireg r1 ireg r2
  | Psubfic(r1, r2, c) ->
      fprintf oc "	subfic	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Psync ->
      fprintf oc "	sync\n"
  | Ptrap ->
      fprintf oc "	trap\n"
  | Pxor(r1, r2, r3) ->
      fprintf oc "	xor	%a, %a, %a\n" ireg r1 ireg r2 ireg r3
  | Pxori(r1, r2, c) ->
      fprintf oc "	xori	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Pxoris(r1, r2, c) ->
      fprintf oc "	xoris	%a, %a, %a\n" ireg r1 ireg r2 constant c
  | Plabel lbl ->
      if (not fallthrough) && !Clflags.option_falignbranchtargets > 0 then
        fprintf oc "	.balign	%d\n" !Clflags.option_falignbranchtargets;
      fprintf oc "%a:\n" label (transl_label lbl)
  | Pbuiltin(ef, args, res) ->
      begin match ef with
      | EF_inline_asm txt ->
          fprintf oc "%s begin inline assembly\n" comment;
          fprintf oc "	%s\n" (extern_atom txt);
          fprintf oc "%s end inline assembly\n" comment
      | _ ->
          assert false
      end
  | Pannot(ef, args) ->
      begin match ef with
      | EF_annot(txt, targs) ->
          print_annot_stmt oc (extern_atom txt) targs args
      | _ ->
          assert false
      end
  | Pcfi_adjust n ->
      cfi_adjust oc (camlint_of_coqint n)
  | Pcfi_rel_offset n ->
      cfi_rel_offset oc "lr" (camlint_of_coqint n)


(* Emit a sequence of instructions *)

let rec print_instructions oc tbl pc fallthrough = function
  | [] -> ()
  | i :: c ->
      print_instruction oc tbl pc fallthrough i;
      print_instructions oc tbl (pc + instr_size i) (instr_fall_through i) c

(* Print the code for a function *)

let print_literal64 oc (lbl, n) =
  let nlo = Int64.to_int32 n
  and nhi = Int64.to_int32(Int64.shift_right_logical n 32) in
  fprintf oc "%a:	.long	0x%lx, 0x%lx\n" label lbl nhi nlo

let print_literal32 oc (lbl, n) =
  fprintf oc "%a:	.long	0x%lx\n" label lbl n

let print_jumptable oc (lbl, tbl) =
  fprintf oc "%a:" label lbl;
  List.iter
    (fun l -> fprintf oc "	.long	%a\n" label (transl_label l))
    tbl

let print_function oc name fn =
  Hashtbl.clear current_function_labels;
  float_literals := [];
  float32_literals := [];
  jumptables := [];
  let (text, lit, jmptbl) =
    match C2C.atom_sections name with
    | [t;l;j] -> (t, l, j)
    |    _    -> (Section_text, Section_literal, Section_jumptable) in
  section oc text;
  let alignment =
    match !Clflags.option_falignfunctions with Some n -> n | None -> 4 in
  fprintf oc "	.balign %d\n" alignment;
  if not (C2C.atom_is_static name) then
    fprintf oc "	.globl %a\n" symbol name;
  fprintf oc "%a:\n" symbol name;
  print_location oc (C2C.atom_location name);
  cfi_startproc oc;
  print_instructions oc (label_positions PTree.empty 0 fn.fn_code) 
                        0 true fn.fn_code;
  cfi_endproc oc;
  fprintf oc "	.type	%a, @function\n" symbol name;
  fprintf oc "	.size	%a, . - %a\n" symbol name symbol name;
  if !float_literals <> [] || !float32_literals <> [] then begin
    section oc lit;
    fprintf oc "	.balign 8\n";
    List.iter (print_literal64 oc) !float_literals;
    List.iter (print_literal32 oc) !float32_literals;
    float_literals := []; float32_literals := []
  end;
  if !jumptables <> [] then begin
    section oc jmptbl;
    fprintf oc "	.balign 4\n";
    List.iter (print_jumptable oc) !jumptables;
    jumptables := []
  end

(* Generation of whole programs *)

let print_fundef oc name defn =
  match defn with
  | Internal code ->
      print_function oc name code
  | External _ ->
      ()

let print_init oc = function
  | Init_int8 n ->
      fprintf oc "	.byte	%ld\n" (camlint_of_coqint n)
  | Init_int16 n ->
      fprintf oc "	.short	%ld\n" (camlint_of_coqint n)
  | Init_int32 n ->
      fprintf oc "	.long	%ld\n" (camlint_of_coqint n)
  | Init_int64 n ->
      let b = camlint64_of_coqint n in
      fprintf oc "	.long	0x%Lx, 0x%Lx\n"
                 (Int64.shift_right_logical b 32)
                 (Int64.logand b 0xFFFFFFFFL)
  | Init_float32 n ->
      fprintf oc "	.long	0x%lx %s %.18g\n"
                 (camlint_of_coqint (Floats.Float32.to_bits n))
                 comment (camlfloat_of_coqfloat n)
  | Init_float64 n ->
      let b = camlint64_of_coqint (Floats.Float.to_bits n) in
      fprintf oc "	.long	0x%Lx, 0x%Lx %s %.18g\n"
                 (Int64.shift_right_logical b 32)
                 (Int64.logand b 0xFFFFFFFFL)
                 comment (camlfloat_of_coqfloat n)
  | Init_space n ->
      if Z.gt n Z.zero then
        fprintf oc "	.space	%s\n" (Z.to_string n)
  | Init_addrof(symb, ofs) ->
      fprintf oc "	.long	%a\n" 
                 symbol_offset (symb, camlint_of_coqint ofs)

let print_init_data oc name id =
  if Str.string_match PrintCsyntax.re_string_literal (extern_atom name) 0
  && List.for_all (function Init_int8 _ -> true | _ -> false) id
  then
    fprintf oc "	.ascii	\"%s\"\n" (PrintCsyntax.string_of_init id)
  else
    List.iter (print_init oc) id

let print_var oc name v =
  match v.gvar_init with
  | [] -> ()
  | _  ->
      let sec =
        match C2C.atom_sections name with
        | [s] -> s
        |  _  -> Section_data true
      and align =
        match C2C.atom_alignof name with
        | Some a -> a
        | None -> 8 in (* 8-alignment is a safe default *)
      let name_sec =
        name_of_section sec in
      if name_sec <> "COMM" then begin
        fprintf oc "	%s\n" name_sec;
        fprintf oc "	.balign	%d\n" align;
        if not (C2C.atom_is_static name) then
          fprintf oc "	.globl	%a\n" symbol name;
        fprintf oc "%a:\n" symbol name;
        print_init_data oc name v.gvar_init;
        fprintf oc "	.type	%a, @object\n" symbol name;
        fprintf oc "	.size	%a, . - %a\n" symbol name symbol name
      end else begin
        let sz =
          match v.gvar_init with [Init_space sz] -> sz | _ -> assert false in
        fprintf oc "	%s	%a, %s, %d\n"
          (if C2C.atom_is_static name then ".lcomm" else ".comm")
          symbol name
          (Z.to_string sz)
          align
      end

let print_globdef oc (name, gdef) =
  match gdef with
  | Gfun f -> print_fundef oc name f
  | Gvar v -> print_var oc name v

  end)

type target = Linux | Diab

let print_program oc p =
  let target = 
    (match Configuration.system with
    | "linux"  -> Linux
    | "diab"   -> Diab
    | _        -> invalid_arg ("System " ^ Configuration.system ^ " not supported")) in
  let module Target = (val (match target with
  | Linux -> (module Linux_System:SYSTEM)
  | Diab -> (module Diab_System:SYSTEM)):SYSTEM) in
  let module Printer = AsmPrinter(Target) in
  Printer.set_compilation_unit_addrs 1 2; (* TODO This is dummy code *)
  Printer.reset_file_line();
  PrintAnnot.print_version_and_options oc Printer.comment;
  Printer.print_prologue oc;
  List.iter (Printer.print_globdef oc) p.prog_defs;
  Printer.print_epilogue oc