-- Mcode back-end for ortho - Binary X86 instructions generator. -- Copyright (C) 2006 Tristan Gingold -- -- GHDL is free software; you can redistribute it and/or modify it under -- the terms of the GNU General Public License as published by the Free -- Software Foundation; either version 2, or (at your option) any later -- version. -- -- GHDL is distributed in the hope that it will be useful, but WITHOUT ANY -- WARRANTY; without even the implied warranty of MERCHANTABILITY or -- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- for more details. -- -- You should have received a copy of the GNU General Public License -- along with GCC; see the file COPYING. If not, write to the Free -- Software Foundation, 59 Temple Place - Suite 330, Boston, MA -- 02111-1307, USA. with Ortho_Code.Abi; with Ortho_Code.Decls; with Ortho_Code.Types; with Ortho_Code.Consts; with Ortho_Code.Debug; with Ortho_Code.X86.Insns; with Ortho_Code.X86.Flags; with Ortho_Code.Flags; with Ortho_Code.Dwarf; with Ortho_Code.Binary; use Ortho_Code.Binary; with Ortho_Ident; with Ada.Text_IO; with Interfaces; use Interfaces; package body Ortho_Code.X86.Emits is type Insn_Size is (Sz_8, Sz_16, Sz_32, Sz_32l, Sz_32h, Sz_64); -- Sz_64 if M64 or Sz_32 Sz_Ptr : constant Insn_Size := Insn_Size'Val (Boolean'Pos (Flags.M64) * Insn_Size'Pos (Sz_64) + Boolean'Pos (not Flags.M64) * Insn_Size'Pos (Sz_32)); -- For FP, size doesn't matter in modrm and SIB. But don't emit the REX.W -- prefix, that's useless. Sz_Fp : constant Insn_Size := Sz_32; type Int_Mode_To_Size_Array is array (Mode_U8 .. Mode_I64) of Insn_Size; Int_Mode_To_Size : constant Int_Mode_To_Size_Array := (Mode_U8 | Mode_I8 => Sz_8, Mode_U16 | Mode_I16 => Sz_16, Mode_U32 | Mode_I32 => Sz_32, Mode_U64 | Mode_I64 => Sz_64); -- Well known sections. Sect_Text : Binary_File.Section_Acc; Sect_Rodata : Binary_File.Section_Acc; Sect_Bss : Binary_File.Section_Acc; -- For 64 bit to 32 bit conversion, we need an extra register. Just before -- the conversion, there is an OE_Reg instruction containing the extra -- register. Its value is saved here. Reg_Helper : O_Reg; Subprg_Pc : Pc_Type; -- x86 opcodes. Opc_Data16 : constant := 16#66#; -- Opc_Rex : constant := 16#40#; Opc_Rex_W : constant := 16#48#; Opc_Rex_R : constant := 16#44#; Opc_Rex_X : constant := 16#42#; Opc_Rex_B : constant := 16#41#; Opc_Into : constant := 16#ce#; Opc_Cdq : constant := 16#99#; Opc_Int : constant := 16#cd#; Opc_Addl_Reg_Rm : constant := 16#03#; Opc_Xorl_Rm_Reg : constant := 16#31#; Opc_Subl_Reg_Rm : constant := 16#2b#; -- Reg <- Reg - Rm Opc_Cmpl_Rm_Reg : constant := 16#39#; Opc_Leal_Reg_Rm : constant := 16#8d#; Opc_Movb_Imm_Reg : constant := 16#b0#; Opc_Movl_Imm_Reg : constant := 16#b8#; Opc_Movsxd_Reg_Rm : constant := 16#63#; Opc_Imul_Reg_Rm_Imm32 : constant := 16#69#; Opc_Imul_Reg_Rm_Imm8 : constant := 16#6b#; Opc_Mov_Rm_Imm : constant := 16#c6#; -- Eb,Ib or Ev,Iz (grp11, opc2=0) Opc_Mov_Rm_Reg : constant := 16#88#; -- Store: Eb,Gb or Ev,Gv Opc_Mov_Reg_Rm : constant := 16#8a#; -- Load: Gb,Eb or Gv,Ev Opc_Movl_Reg_Rm : constant := 16#8b#; -- Load: Gv,Ev -- Opc_Grp1_Rm_Imm : constant := 16#80#; Opc_Grp1b_Rm_Imm8 : constant := 16#80#; Opc_Grp1v_Rm_Imm32 : constant := 16#81#; -- Opc_Grp1b_Rm_Imm8 : constant := 16#82#; -- Should not be used. Opc_Grp1v_Rm_Imm8 : constant := 16#83#; Opc2_Grp1_Add : constant := 2#000_000#; -- Second byte Opc2_Grp1_Or : constant := 2#001_000#; -- Second byte Opc2_Grp1_Adc : constant := 2#010_000#; -- Second byte Opc2_Grp1_Sbb : constant := 2#011_000#; -- Second byte Opc2_Grp1_And : constant := 2#100_000#; -- Second byte Opc2_Grp1_Sub : constant := 2#101_000#; -- Second byte Opc2_Grp1_Xor : constant := 2#110_000#; -- Second byte Opc2_Grp1_Cmp : constant := 2#111_000#; -- Second byte Opc_Grp3_Width : constant := 16#f6#; Opc2_Grp3_Not : constant := 2#010_000#; Opc2_Grp3_Neg : constant := 2#011_000#; Opc2_Grp3_Mul : constant := 2#100_000#; Opc2_Grp3_Imul : constant := 2#101_000#; Opc2_Grp3_Div : constant := 2#110_000#; Opc2_Grp3_Idiv : constant := 2#111_000#; Opc_Test_Rm_Reg : constant := 16#84#; -- Eb,Gb or Ev,Gv Opc_Push_Imm8 : constant := 16#6a#; Opc_Push_Imm : constant := 16#68#; Opc_Push_Reg : constant := 16#50#; -- opc[2:0] is reg. Opc_Pop_Reg : constant := 16#58#; -- opc[2:0] is reg. Opc_Grp5 : constant := 16#ff#; Opc2_Grp5_Push_Rm : constant := 2#110_000#; -- Opc_Grp1a : constant := 16#8f#; -- Opc2_Grp1a_Pop_Rm : constant := 2#000_000#; Opc_Jcc : constant := 16#70#; Opc_0f : constant := 16#0f#; Opc2_0f_Jcc : constant := 16#80#; Opc2_0f_Setcc : constant := 16#90#; Opc2_0f_Movzx : constant := 16#b6#; Opc2_0f_Imul : constant := 16#af#; Opc2_0f_Andp : constant := 16#54#; Opc2_0f_Xorp : constant := 16#57#; Opc_Call : constant := 16#e8#; Opc_Jmp_Long : constant := 16#e9#; Opc_Jmp_Short : constant := 16#eb#; Opc_Ret : constant := 16#c3#; Opc_Leave : constant := 16#c9#; Opc_Movsd_Xmm_M64 : constant := 16#10#; -- Load xmm <- M64 Opc_Movsd_M64_Xmm : constant := 16#11#; -- Store M64 <- xmm Opc_Cvtsi2sd_Xmm_Rm : constant := 16#2a#; -- Xmm <- cvt (rm) Opc_Cvtsd2si_Reg_Xm : constant := 16#2d#; -- Reg <- cvt (xmm/m64) procedure Error_Emit (Msg : String; Insn : O_Enode) is use Ada.Text_IO; begin Put ("error_emit: "); Put (Msg); Put (", insn="); Put (O_Enode'Image (Insn)); Put (" ("); Put (OE_Kind'Image (Get_Expr_Kind (Insn))); Put (")"); New_Line; raise Program_Error; end Error_Emit; procedure Gen_Rex (B : Byte) is begin if Flags.M64 then Gen_8 (B); end if; end Gen_Rex; procedure Gen_Rex_B (R : O_Reg; Sz : Insn_Size) is B : Byte; begin if Flags.M64 then B := 0; if R in Regs_R8_R15 or R in Regs_Xmm8_Xmm15 then B := B or Opc_Rex_B; end if; if Sz = Sz_64 then B := B or Opc_Rex_W; end if; if B /= 0 then Gen_8 (B); end if; end if; end Gen_Rex_B; -- For many opcodes, the size of the operand is coded in bit 0, and the -- prefix data16 can be used for 16-bit operation. -- Deal with size. procedure Gen_Insn_Sz (B : Byte; Sz : Insn_Size) is begin case Sz is when Sz_8 => Gen_8 (B); when Sz_16 => Gen_8 (Opc_Data16); Gen_8 (B + 1); when Sz_32 | Sz_32l | Sz_32h | Sz_64 => Gen_8 (B + 1); end case; end Gen_Insn_Sz; procedure Gen_Insn_Sz_S8 (B : Byte; Sz : Insn_Size) is begin case Sz is when Sz_8 => Gen_8 (B); when Sz_16 => Gen_8 (Opc_Data16); Gen_8 (B + 3); when Sz_32 | Sz_32l | Sz_32h | Sz_64 => Gen_8 (B + 3); end case; end Gen_Insn_Sz_S8; function Get_Const_Val (C : O_Enode; Sz : Insn_Size) return Uns32 is begin case Sz is when Sz_8 | Sz_16 | Sz_32 | Sz_32l => return Get_Expr_Low (C); when Sz_32h => return Get_Expr_High (C); when Sz_64 => return Get_Expr_Low (C); end case; end Get_Const_Val; function Is_Imm8 (N : O_Enode; Sz : Insn_Size) return Boolean is begin if Get_Expr_Kind (N) /= OE_Const then return False; end if; return Get_Const_Val (N, Sz) <= 127; end Is_Imm8; procedure Gen_Imm8 (N : O_Enode; Sz : Insn_Size) is begin Gen_8 (Byte (Get_Const_Val (N, Sz))); end Gen_Imm8; -- procedure Gen_Imm32 (N : O_Enode; Sz : Insn_Size) -- is -- use Interfaces; -- begin -- case Get_Expr_Kind (N) is -- when OE_Const => -- Gen_32 (Unsigned_32 (Get_Const_Val (N, Sz))); -- when OE_Addrg => -- Gen_X86_32 (Get_Decl_Symbol (Get_Addr_Object (N)), 0); -- when others => -- raise Program_Error; -- end case; -- end Gen_Imm32; -- Generate an immediat constant. procedure Gen_Imm_Addr (N : O_Enode) is Sym : Symbol; P : O_Enode; L, R : O_Enode; S, C : O_Enode; Off : Int32; begin Off := 0; P := N; while Get_Expr_Kind (P) = OE_Add loop L := Get_Expr_Left (P); R := Get_Expr_Right (P); -- Extract the const node. if Get_Expr_Kind (R) = OE_Const then S := L; C := R; elsif Get_Expr_Kind (L) = OE_Const then S := R; C := L; else raise Program_Error; end if; pragma Assert (Get_Expr_Mode (C) = Mode_U32); Off := Off + To_Int32 (Get_Expr_Low (C)); P := S; end loop; pragma Assert (Get_Expr_Kind (P) = OE_Addrd); Sym := Get_Decl_Symbol (Get_Addr_Decl (P)); Gen_Abs (Sym, Integer_32 (Off)); end Gen_Imm_Addr; -- Generate an immediat constant. procedure Gen_Imm (N : O_Enode; Sz : Insn_Size) is begin case Get_Expr_Kind (N) is when OE_Const => case Sz is when Sz_8 => Gen_8 (Byte (Get_Expr_Low (N) and 16#FF#)); when Sz_16 => Gen_16 (Unsigned_32 (Get_Expr_Low (N) and 16#FF_FF#)); when Sz_32 | Sz_32l => Gen_32 (Unsigned_32 (Get_Expr_Low (N))); when Sz_32h => Gen_32 (Unsigned_32 (Get_Expr_High (N))); when Sz_64 => -- Immediates are sign extended. pragma Assert (Is_Expr_S32 (N)); Gen_32 (Unsigned_32 (Get_Expr_Low (N))); end case; when OE_Add | OE_Addrd => -- Only for 32-bit immediat. pragma Assert (Sz = Sz_32); Gen_Imm_Addr (N); when others => raise Program_Error; end case; end Gen_Imm; function To_Reg32 (R : O_Reg) return Byte is begin pragma Assert (R in Regs_R32); return O_Reg'Pos (R) - O_Reg'Pos (R_Ax); end To_Reg32; pragma Inline (To_Reg32); function To_Reg64 (R : O_Reg) return Byte is begin pragma Assert (R in Regs_R64); return Byte (O_Reg'Pos (R) - O_Reg'Pos (R_Ax)) and 7; end To_Reg64; pragma Inline (To_Reg64); function To_Reg_Xmm (R : O_Reg) return Byte is begin return O_Reg'Pos (R) - O_Reg'Pos (R_Xmm0); end To_Reg_Xmm; pragma Inline (To_Reg_Xmm); function To_Reg32 (R : O_Reg; Sz : Insn_Size) return Byte is begin case Sz is when Sz_8 => pragma Assert ((not Flags.M64 and R in Regs_R8) or (Flags.M64 and R in Regs_R64)); return To_Reg64 (R); when Sz_16 => pragma Assert (R in Regs_R32); return To_Reg64 (R); when Sz_32 => pragma Assert ((not Flags.M64 and R in Regs_R32) or (Flags.M64 and R in Regs_R64)); return To_Reg64 (R); when Sz_32l => pragma Assert (not Flags.M64); case R is when R_Edx_Eax => return 2#000#; when R_Ebx_Ecx => return 2#001#; when R_Esi_Edi => return 2#111#; when others => raise Program_Error; end case; when Sz_32h => pragma Assert (not Flags.M64); case R is when R_Edx_Eax => return 2#010#; when R_Ebx_Ecx => return 2#011#; when R_Esi_Edi => return 2#110#; when others => raise Program_Error; end case; when Sz_64 => pragma Assert (R in Regs_R64); return Byte (O_Reg'Pos (R) - O_Reg'Pos (R_Ax)) and 7; end case; end To_Reg32; function To_Cond (R : O_Reg) return Byte is begin return O_Reg'Pos (R) - O_Reg'Pos (R_Ov); end To_Cond; pragma Inline (To_Cond); function To_Reg (R : O_Reg; Sz : Insn_Size) return Byte is begin if R in Regs_Xmm then return To_Reg_Xmm (R); else return To_Reg32 (R, Sz); end if; end To_Reg; -- SIB + disp values. SIB_Scale : Byte; SIB_Index : O_Reg; Rm_Base : O_Reg; Rm_Offset : Int32; Rm_Sym : Symbol; -- If not R_Nil, the reg/opc field (bit 3-5) of the ModR/M byte is a -- register. Rm_Opc_Reg : O_Reg; Rm_Opc_Sz : Insn_Size; -- If not R_Nil, encode mod=11 (no memory access). All above variables -- must be 0/R_Nil. Rm_Reg : O_Reg; Rm_Sz : Insn_Size; procedure Gen_Rex_Mod_Rm is B : Byte; begin if Flags.M64 then B := 0; if Rm_Sz = Sz_64 then B := B or Opc_Rex_W; end if; if Rm_Opc_Reg in Regs_R8_R15 or Rm_Opc_Reg in Regs_Xmm8_Xmm15 then B := B or Opc_Rex_R; end if; if Rm_Reg in Regs_R8_R15 or Rm_Reg in Regs_Xmm8_Xmm15 or Rm_Base in Regs_R8_R15 then B := B or Opc_Rex_B; end if; if SIB_Index in Regs_R8_R15 then B := B or Opc_Rex_X; end if; if B /= 0 then Gen_8 (B); end if; end if; end Gen_Rex_Mod_Rm; procedure Fill_Sib (N : O_Enode) is use Ortho_Code.Decls; Reg : constant O_Reg := Get_Expr_Reg (N); begin -- A simple register. if Reg in Regs_R64 then if Rm_Base = R_Nil then Rm_Base := Reg; elsif SIB_Index = R_Nil then SIB_Index := Reg; else -- It is not possible to add 3 registers with SIB. raise Program_Error; end if; return; end if; case Get_Expr_Kind (N) is when OE_Indir => Fill_Sib (Get_Expr_Operand (N)); when OE_Addrl => declare Frame : constant O_Enode := Get_Addrl_Frame (N); begin if Frame = O_Enode_Null then -- Local frame: use the frame pointer. Rm_Base := R_Bp; else -- In an outer frame: use the computed frame register. Rm_Base := Get_Expr_Reg (Frame); end if; end; Rm_Offset := Rm_Offset + Get_Local_Offset (Get_Addr_Decl (N)); when OE_Addrd => -- Cannot add two symbols. pragma Assert (Rm_Sym = Null_Symbol); Rm_Sym := Get_Decl_Symbol (Get_Addr_Decl (N)); when OE_Add => Fill_Sib (Get_Expr_Left (N)); Fill_Sib (Get_Expr_Right (N)); when OE_Const => Rm_Offset := Rm_Offset + To_Int32 (Get_Expr_Low (N)); when OE_Shl => -- Only one scale. pragma Assert (SIB_Index = R_Nil); SIB_Index := Get_Expr_Reg (Get_Expr_Left (N)); SIB_Scale := Byte (Get_Expr_Low (Get_Expr_Right (N))); when others => Error_Emit ("fill_sib", N); end case; end Fill_Sib; -- Write the SIB byte. procedure Gen_Sib is Base : Byte; begin if Rm_Base = R_Nil then Base := 2#101#; -- BP else pragma Assert (not (SIB_Index = R_Sp and (Rm_Base = R_Bp or Rm_Base = R_R13))); Base := To_Reg64 (Rm_Base); end if; Gen_8 (SIB_Scale * 2#1_000_000# + To_Reg64 (SIB_Index) * 2#1_000# + Base); end Gen_Sib; -- ModRM is a register. procedure Init_Modrm_Reg (Reg : O_Reg; Sz : Insn_Size; Opc : O_Reg := R_Nil; Opc_Sz : Insn_Size := Sz_32) is begin Rm_Base := R_Nil; SIB_Index := R_Nil; SIB_Scale := 0; Rm_Sym := Null_Symbol; Rm_Offset := 0; Rm_Opc_Reg := Opc; Rm_Opc_Sz := Opc_Sz; Rm_Reg := Reg; Rm_Sz := Sz; Gen_Rex_Mod_Rm; end Init_Modrm_Reg; -- Note: SZ is not relevant. procedure Init_Modrm_Sym (Sym : Symbol; Sz : Insn_Size; Opc_Reg : O_Reg) is begin Rm_Base := R_Nil; SIB_Index := R_Nil; SIB_Scale := 0; Rm_Sym := Sym; Rm_Offset := 0; Rm_Opc_Reg := Opc_Reg; Rm_Opc_Sz := Sz; Rm_Reg := R_Nil; Rm_Sz := Sz; Gen_Rex_Mod_Rm; end Init_Modrm_Sym; -- ModRM is a memory reference. procedure Init_Modrm_Mem (N : O_Enode; Sz : Insn_Size; Opc : O_Reg := R_Nil) is Reg : constant O_Reg := Get_Expr_Reg (N); begin Rm_Base := R_Nil; SIB_Index := R_Nil; Rm_Reg := R_Nil; Rm_Sz := Sz; Rm_Opc_Reg := Opc; Rm_Opc_Sz := Sz; if Sz = Sz_32h then Rm_Offset := 4; else Rm_Offset := 0; end if; SIB_Scale := 0; Rm_Sym := Null_Symbol; case Reg is when R_Mem | R_Imm | R_Eq | R_B_Off | R_B_I | R_I_Off | R_Sib => Fill_Sib (N); when Regs_R64 => Rm_Base := Reg; when R_Spill => Rm_Base := R_Bp; Rm_Offset := Rm_Offset + Get_Spill_Info (N); when others => Error_Emit ("init_modrm_mem: unhandled reg", N); end case; Gen_Rex_Mod_Rm; end Init_Modrm_Mem; procedure Init_Modrm_Expr (N : O_Enode; Sz : Insn_Size; Opc : O_Reg := R_Nil) is Reg : constant O_Reg := Get_Expr_Reg (N); begin case Reg is when Regs_R64 | Regs_Pair | Regs_Xmm => -- Destination is a register. Init_Modrm_Reg (Reg, Sz, Opc, Sz); when others => -- Destination is an effective address. Init_Modrm_Mem (N, Sz, Opc); end case; end Init_Modrm_Expr; procedure Init_Modrm_Offset (Base : O_Reg; Off : Int32; Sz : Insn_Size; Opc : O_Reg := R_Nil) is begin SIB_Index := R_Nil; SIB_Scale := 0; Rm_Reg := R_Nil; Rm_Sym := Null_Symbol; Rm_Sz := Sz; Rm_Base := Base; Rm_Opc_Reg := Opc; Rm_Opc_Sz := Sz; if Sz = Sz_32h then Rm_Offset := Off + 4; else Rm_Offset := Off; end if; Gen_Rex_Mod_Rm; end Init_Modrm_Offset; -- Generate an R/M (+ SIB) byte. -- R is added to the R/M byte. procedure Gen_Mod_Rm_B (R : Byte) is begin if Rm_Reg /= R_Nil then -- Register: mod = 11, no memory access. pragma Assert (Rm_Base = R_Nil); pragma Assert (Rm_Sym = Null_Symbol); pragma Assert (Rm_Offset = 0); pragma Assert (SIB_Index = R_Nil); Gen_8 (2#11_000_000# + R + To_Reg (Rm_Reg, Rm_Sz)); return; end if; if SIB_Index /= R_Nil or (Flags.M64 and Rm_Base = R_R12) then -- With SIB. if SIB_Index = R_Nil then SIB_Index := R_Sp; end if; if Rm_Base = R_Nil then -- No base (but index). Use the special encoding with base=BP. Gen_8 (2#00_000_100# + R); -- mod=00, rm=SP -> disp32. Rm_Base := R_Bp; Gen_Sib; if Rm_Sym = Null_Symbol then Gen_32 (Unsigned_32 (To_Uns32 (Rm_Offset))); else pragma Assert (not Flags.M64); Gen_X86_32 (Rm_Sym, Integer_32 (Rm_Offset)); end if; elsif Rm_Sym = Null_Symbol and Rm_Offset = 0 and Rm_Base /= R_Bp and Rm_Base /= R_R13 then -- No offset (only allowed if base is not BP). Gen_8 (2#00_000_100# + R); Gen_Sib; elsif Rm_Sym = Null_Symbol and Rm_Offset in -128 .. 127 then -- Disp8 Gen_8 (2#01_000_100# + R); Gen_Sib; Gen_8 (Byte (To_Uns32 (Rm_Offset) and 16#Ff#)); else -- Disp32 Gen_8 (2#10_000_100# + R); Gen_Sib; if Rm_Sym = Null_Symbol then Gen_32 (Unsigned_32 (To_Uns32 (Rm_Offset))); else pragma Assert (not Flags.M64); Gen_X86_32 (Rm_Sym, Integer_32 (Rm_Offset)); end if; end if; else case Rm_Base is when R_Sp => -- It isn't possible to use SP as a base register without using -- an SIB encoding. raise Program_Error; when R_Nil => -- There should be no case where the offset is negative. pragma Assert (Rm_Offset >= 0); -- Encode for disp32 (Mod=00, R/M=101) or RIP relative Gen_8 (2#00_000_101# + R); if Flags.M64 then -- RIP relative Gen_X86_Pc32 (Rm_Sym, Unsigned_32 (Rm_Offset)); else -- Disp32. Gen_X86_32 (Rm_Sym, Integer_32 (Rm_Offset)); end if; when R_Ax | R_Bx | R_Cx | R_Dx | R_Bp | R_Si | R_Di | R_R8 .. R_R11 | R_R13 .. R_R15 => if Rm_Offset = 0 and Rm_Sym = Null_Symbol and Rm_Base /= R_Bp and Rm_Base /= R_R13 then -- No disp: use Mod=00 (not supported if base is BP or R13). Gen_8 (2#00_000_000# + R + To_Reg64 (Rm_Base)); elsif Rm_Sym = Null_Symbol and Rm_Offset <= 127 and Rm_Offset >= -128 then -- Disp8 (Mod=01) Gen_8 (2#01_000_000# + R + To_Reg64 (Rm_Base)); Gen_8 (Byte (To_Uns32 (Rm_Offset) and 16#Ff#)); else -- Disp32 (Mod=10) Gen_8 (2#10_000_000# + R + To_Reg64 (Rm_Base)); if Rm_Sym = Null_Symbol then Gen_32 (Unsigned_32 (To_Uns32 (Rm_Offset))); else pragma Assert (not Flags.M64); Gen_X86_32 (Rm_Sym, Integer_32 (Rm_Offset)); end if; end if; when others => raise Program_Error; end case; end if; end Gen_Mod_Rm_B; procedure Gen_Mod_Rm_Opc (R : Byte) is begin pragma Assert (Rm_Opc_Reg = R_Nil); Gen_Mod_Rm_B (R); end Gen_Mod_Rm_Opc; procedure Gen_Mod_Rm_Reg is begin pragma Assert (Rm_Opc_Reg /= R_Nil); Gen_Mod_Rm_B (To_Reg (Rm_Opc_Reg, Rm_Opc_Sz) * 8); end Gen_Mod_Rm_Reg; procedure Gen_Grp1_Insn (Op : Byte; Stmt : O_Enode; Sz : Insn_Size) is L : constant O_Enode := Get_Expr_Left (Stmt); R : constant O_Enode := Get_Expr_Right (Stmt); Lr : constant O_Reg := Get_Expr_Reg (L); Rr : constant O_Reg := Get_Expr_Reg (R); begin Start_Insn; case Rr is when R_Imm => if Lr = R_Ax then -- Use compact encoding. if Sz = Sz_64 then Gen_8 (Opc_Rex_W); end if; Gen_Insn_Sz (2#000_000_100# + Op, Sz); Gen_Imm (R, Sz); elsif Is_Imm8 (R, Sz) then Init_Modrm_Expr (L, Sz); Gen_Insn_Sz_S8 (16#80#, Sz); Gen_Mod_Rm_Opc (Op); Gen_Imm8 (R, Sz); else Init_Modrm_Expr (L, Sz); Gen_Insn_Sz (16#80#, Sz); Gen_Mod_Rm_Opc (Op); Gen_Imm (R, Sz); end if; when R_Mem | R_Spill | Regs_R64 | Regs_Pair => Init_Modrm_Expr (R, Sz, Lr); Gen_Insn_Sz (2#00_000_010# + Op, Sz); Gen_Mod_Rm_Reg; when others => Error_Emit ("emit_op", Stmt); end case; End_Insn; end Gen_Grp1_Insn; -- Emit a one byte instruction. procedure Gen_1 (B : Byte) is begin Start_Insn; Gen_8 (B); End_Insn; end Gen_1; -- Emit a two byte instruction. procedure Gen_2 (B1, B2 : Byte) is begin Start_Insn; Gen_8 (B1); Gen_8 (B2); End_Insn; end Gen_2; -- Grp1 instructions have a mod/rm and an immediate value VAL. -- Mod/Rm must be initialized. procedure Gen_Insn_Grp1 (Opc2 : Byte; Val : Int32) is begin if Val in -128 .. 127 then case Rm_Sz is when Sz_8 => Gen_8 (Opc_Grp1b_Rm_Imm8); when Sz_16 => Gen_8 (Opc_Data16); Gen_8 (Opc_Grp1v_Rm_Imm8); when Sz_32 | Sz_32l | Sz_32h | Sz_64 => Gen_8 (Opc_Grp1v_Rm_Imm8); end case; Gen_Mod_Rm_Opc (Opc2); Gen_8 (Byte (To_Uns32 (Val) and 16#Ff#)); else case Rm_Sz is when Sz_8 => pragma Assert (False); null; when Sz_16 => Gen_8 (Opc_Data16); Gen_8 (Opc_Grp1v_Rm_Imm32); when Sz_32 | Sz_32l | Sz_32h | Sz_64 => Gen_8 (Opc_Grp1v_Rm_Imm32); end case; Gen_Mod_Rm_Opc (Opc2); Gen_32 (Unsigned_32 (To_Uns32 (Val))); end if; end Gen_Insn_Grp1; procedure Gen_Cdq (Sz : Insn_Size) is begin Start_Insn; if Sz = Sz_64 then Gen_8 (Opc_Rex_W); end if; Gen_8 (Opc_Cdq); End_Insn; end Gen_Cdq; procedure Gen_Clear_Edx is begin -- Xorl edx, edx Gen_2 (Opc_Xorl_Rm_Reg, 2#11_010_010#); end Gen_Clear_Edx; procedure Gen_Grp3_Insn (Op : Byte; Val : O_Enode; Sz : Insn_Size) is begin Start_Insn; -- Unary Group 3 (test, not, neg...) Init_Modrm_Expr (Val, Sz); Gen_Insn_Sz (Opc_Grp3_Width, Sz); Gen_Mod_Rm_Opc (Op); End_Insn; end Gen_Grp3_Insn; procedure Gen_Grp3_Insn_Stmt (Op : Byte; Stmt : O_Enode; Sz : Insn_Size) is begin Gen_Grp3_Insn (Op, Get_Expr_Operand (Stmt), Sz); end Gen_Grp3_Insn_Stmt; procedure Emit_Load_Imm (Stmt : O_Enode; Sz : Insn_Size) is Tr : constant O_Reg := Get_Expr_Reg (Stmt); begin Start_Insn; -- TODO: handle 0 specially: use xor -- Mov immediate. case Sz is when Sz_8 => Gen_Rex_B (Tr, Sz); Gen_8 (Opc_Movb_Imm_Reg + To_Reg32 (Tr, Sz)); Gen_Imm (Stmt, Sz); when Sz_16 => Gen_8 (Opc_Data16); Gen_8 (Opc_Movl_Imm_Reg + To_Reg32 (Tr, Sz)); Gen_Imm (Stmt, Sz); when Sz_32 | Sz_32l | Sz_32h => Gen_Rex_B (Tr, Sz); Gen_8 (Opc_Movl_Imm_Reg + To_Reg32 (Tr, Sz)); Gen_Imm (Stmt, Sz); when Sz_64 => if Get_Expr_Kind (Stmt) = OE_Const then if Get_Expr_High (Stmt) = 0 then Gen_Rex_B (Tr, Sz_32); Gen_8 (Opc_Movl_Imm_Reg + To_Reg32 (Tr, Sz)); Gen_32 (Unsigned_32 (Get_Expr_Low (Stmt))); else Gen_Rex_B (Tr, Sz_64); Gen_8 (Opc_Movl_Imm_Reg + To_Reg32 (Tr, Sz)); Gen_32 (Unsigned_32 (Get_Expr_Low (Stmt))); Gen_32 (Unsigned_32 (Get_Expr_High (Stmt))); end if; else Gen_Rex_B (Tr, Sz_64); Gen_8 (Opc_Movl_Imm_Reg + To_Reg32 (Tr, Sz)); Gen_Imm_Addr (Stmt); end if; end case; End_Insn; end Emit_Load_Imm; function Mode_Fp_To_Mf (Mode : Mode_Fp) return Byte is begin case Mode is when Mode_F32 => return 2#00_0#; when Mode_F64 => return 2#10_0#; end case; end Mode_Fp_To_Mf; subtype Nat_Align is Natural range 0 .. 4; function Gen_Constant_Start (Log2sz : Nat_Align) return Symbol is Sym : Symbol; begin -- Write the constant in .rodata Set_Current_Section (Sect_Rodata); Gen_Pow_Align (Log2sz); Prealloc (2 ** Log2sz); Sym := Create_Local_Symbol; Set_Symbol_Pc (Sym, False); return Sym; end Gen_Constant_Start; function Gen_Constant_32 (Val : Unsigned_32) return Symbol is Sym : Symbol; begin Sym := Gen_Constant_Start (2); Gen_32 (Val); Set_Current_Section (Sect_Text); return Sym; end Gen_Constant_32; function Gen_Constant_64 (Lo, Hi : Unsigned_32) return Symbol is Sym : Symbol; begin Sym := Gen_Constant_Start (3); Gen_32 (Lo); Gen_32 (Hi); Set_Current_Section (Sect_Text); return Sym; end Gen_Constant_64; function Gen_Constant_128 (Lo, Hi : Unsigned_32) return Symbol is Sym : Symbol; begin Sym := Gen_Constant_Start (4); Gen_32 (Lo); Gen_32 (Hi); Gen_32 (Lo); Gen_32 (Hi); Set_Current_Section (Sect_Text); return Sym; end Gen_Constant_128; Xmm_Sign32_Sym : Symbol := Null_Symbol; Xmm_Sign64_Sym : Symbol := Null_Symbol; function Get_Xmm_Sign_Constant (Mode : Mode_Fp) return Symbol is begin case Mode is when Mode_F32 => if Xmm_Sign32_Sym = Null_Symbol then Xmm_Sign32_Sym := Gen_Constant_128 (16#8000_0000#, 16#8000_0000#); end if; return Xmm_Sign32_Sym; when Mode_F64 => if Xmm_Sign64_Sym = Null_Symbol then Xmm_Sign64_Sym := Gen_Constant_128 (0, 16#8000_0000#); end if; return Xmm_Sign64_Sym; end case; end Get_Xmm_Sign_Constant; Xmm_Mask32_Sym : Symbol := Null_Symbol; Xmm_Mask64_Sym : Symbol := Null_Symbol; function Get_Xmm_Mask_Constant (Mode : Mode_Fp) return Symbol is begin case Mode is when Mode_F32 => if Xmm_Mask32_Sym = Null_Symbol then Xmm_Mask32_Sym := Gen_Constant_128 (16#7fff_ffff#, 16#7fff_ffff#); end if; return Xmm_Mask32_Sym; when Mode_F64 => if Xmm_Mask64_Sym = Null_Symbol then Xmm_Mask64_Sym := Gen_Constant_128 (16#ffff_ffff#, 16#7fff_ffff#); end if; return Xmm_Mask64_Sym; end case; end Get_Xmm_Mask_Constant; procedure Gen_SSE_Prefix (Mode : Mode_Fp) is begin case Mode is when Mode_F32 => Gen_8 (16#f3#); when Mode_F64 => Gen_8 (16#f2#); end case; end Gen_SSE_Prefix; procedure Gen_SSE_Opc (Op : Byte) is begin Gen_8 (16#0f#, Op); end Gen_SSE_Opc; procedure Gen_SSE_D16_Opc (Mode : Mode_Fp; Opc : Byte) is begin case Mode is when Mode_F32 => null; when Mode_F64 => Gen_8 (Opc_Data16); end case; Gen_8 (16#0f#); Gen_8 (Opc); end Gen_SSE_D16_Opc; procedure Emit_Load_Fp (Stmt : O_Enode; Mode : Mode_Fp) is Sym : Symbol; R : O_Reg; Lo : constant Unsigned_32 := Unsigned_32 (Get_Expr_Low (Stmt)); begin case Mode is when Mode_F32 => Sym := Gen_Constant_32 (Lo); when Mode_F64 => Sym := Gen_Constant_64 (Lo, Unsigned_32 (Get_Expr_High (Stmt))); end case; -- Load the constant. R := Get_Expr_Reg (Stmt); case R is when R_St0 => Start_Insn; Gen_8 (2#11011_001# + Mode_Fp_To_Mf (Mode)); Gen_8 (2#00_000_101#); Gen_X86_32 (Sym, 0); End_Insn; when Regs_Xmm => Start_Insn; Gen_SSE_Prefix (Mode); Gen_SSE_Opc (Opc_Movsd_Xmm_M64); Gen_8 (2#00_000_101# + To_Reg_Xmm (R) * 2#1_000#); if Flags.M64 then -- RIP relative Gen_X86_Pc32 (Sym, 0); else -- Disp32. Gen_X86_32 (Sym, 0); end if; End_Insn; when others => raise Program_Error; end case; end Emit_Load_Fp; procedure Emit_Load_Fp_Mem (Stmt : O_Enode; Mode : Mode_Fp) is Dest : constant O_Reg := Get_Expr_Reg (Stmt); begin if Dest in Regs_Xmm then Start_Insn; Gen_SSE_Prefix (Mode); Init_Modrm_Mem (Get_Expr_Operand (Stmt), Sz_Fp, Dest); Gen_SSE_Opc (Opc_Movsd_Xmm_M64); Gen_Mod_Rm_Reg; End_Insn; else Start_Insn; Init_Modrm_Mem (Get_Expr_Operand (Stmt), Sz_Fp); Gen_8 (2#11011_001# + Mode_Fp_To_Mf (Mode)); Gen_Mod_Rm_Opc (2#000_000#); End_Insn; end if; end Emit_Load_Fp_Mem; procedure Emit_Load_Mem (Stmt : O_Enode; Sz : Insn_Size) is Tr : constant O_Reg := Get_Expr_Reg (Stmt); Val : constant O_Enode := Get_Expr_Operand (Stmt); begin case Tr is when Regs_R64 | Regs_Pair => -- mov REG, OP Start_Insn; Init_Modrm_Mem (Val, Sz, Tr); Gen_Insn_Sz (Opc_Mov_Reg_Rm, Sz); Gen_Mod_Rm_Reg; End_Insn; when R_Eq => -- Cmp OP, 1 Start_Insn; Init_Modrm_Mem (Val, Sz); Gen_Insn_Grp1 (Opc2_Grp1_Cmp, 1); End_Insn; when others => Error_Emit ("emit_load_mem", Stmt); end case; end Emit_Load_Mem; procedure Emit_Store (Stmt : O_Enode; Sz : Insn_Size) is T : constant O_Enode := Get_Assign_Target (Stmt); R : constant O_Enode := Get_Expr_Operand (Stmt); Tr : constant O_Reg := Get_Expr_Reg (T); Rr : constant O_Reg := Get_Expr_Reg (R); B : Byte; begin Start_Insn; case Rr is when R_Imm => if False and (Tr in Regs_R64 or Tr in Regs_Pair) then B := 2#1011_1_000#; case Sz is when Sz_8 => B := B and not 2#0000_1_000#; when Sz_16 => Gen_8 (16#66#); when Sz_32 | Sz_32l | Sz_32h | Sz_64 => null; end case; Gen_8 (B + To_Reg32 (Tr, Sz)); else Init_Modrm_Mem (T, Sz); Gen_Insn_Sz (Opc_Mov_Rm_Imm, Sz); Gen_Mod_Rm_Opc (16#00#); end if; Gen_Imm (R, Sz); when Regs_R64 | Regs_Pair => Init_Modrm_Mem (T, Sz, Rr); Gen_Insn_Sz (Opc_Mov_Rm_Reg, Sz); Gen_Mod_Rm_Reg; when others => Error_Emit ("emit_store", Stmt); end case; End_Insn; end Emit_Store; procedure Emit_Store_Fp (Stmt : O_Enode; Mode : Mode_Fp) is begin -- fstp Start_Insn; Init_Modrm_Mem (Get_Assign_Target (Stmt), Sz_Ptr); Gen_8 (2#11011_00_1# + Mode_Fp_To_Mf (Mode)); Gen_Mod_Rm_Opc (2#011_000#); End_Insn; end Emit_Store_Fp; procedure Emit_Store_Xmm (Stmt : O_Enode; Mode : Mode_Fp) is begin -- movsd Start_Insn; Gen_SSE_Prefix (Mode); Init_Modrm_Mem (Get_Assign_Target (Stmt), Sz_Fp, Get_Expr_Reg (Get_Expr_Operand (Stmt))); Gen_SSE_Opc (Opc_Movsd_M64_Xmm); Gen_Mod_Rm_Reg; End_Insn; end Emit_Store_Xmm; procedure Gen_Push_Pop_Reg (Opc : Byte; Reg : O_Reg; Sz : Insn_Size) is begin Start_Insn; if Reg in Regs_R8_R15 then Gen_8 (Opc_Rex_B); end if; Gen_8 (Opc + To_Reg32 (Reg, Sz)); End_Insn; end Gen_Push_Pop_Reg; procedure Emit_Push (Val : O_Enode; Sz : Insn_Size) is R : constant O_Reg := Get_Expr_Reg (Val); begin case R is when R_Imm => Start_Insn; if Is_Imm8 (Val, Sz) then Gen_8 (Opc_Push_Imm8); Gen_Imm8 (Val, Sz); else Gen_8 (Opc_Push_Imm); Gen_Imm (Val, Sz); end if; End_Insn; when Regs_R64 | Regs_Pair => Gen_Push_Pop_Reg (Opc_Push_Reg, R, Sz); when others => Start_Insn; Init_Modrm_Expr (Val, Sz); Gen_8 (Opc_Grp5); Gen_Mod_Rm_Opc (Opc2_Grp5_Push_Rm); End_Insn; end case; end Emit_Push; procedure Emit_Subl_Sp_Imm (Len : Byte) is begin Start_Insn; Gen_Rex (Opc_Rex_W); Gen_8 (Opc_Grp1v_Rm_Imm8); Gen_8 (Opc2_Grp1_Sub + 2#11_000_100#); Gen_8 (Len); End_Insn; end Emit_Subl_Sp_Imm; procedure Emit_Addl_Sp_Imm (Len : Byte) is pragma Assert (not Flags.M64); begin Start_Insn; Gen_8 (Opc_Grp1v_Rm_Imm8); Gen_8 (Opc2_Grp1_Add + 2#11_000_100#); Gen_8 (Len); End_Insn; end Emit_Addl_Sp_Imm; procedure Emit_Push_Fp (Op : O_Enode; Mode : Mode_Fp) is Reg : constant O_Reg := Get_Expr_Reg (Op); Len : Byte; begin -- subl esp, val case Mode is when Mode_F32 => Len := 4; when Mode_F64 => Len := 8; end case; Emit_Subl_Sp_Imm (Len); if Reg = R_St0 then -- fstp st, (esp) Start_Insn; Gen_8 (2#11011_001# + Mode_Fp_To_Mf (Mode)); Gen_8 (2#00_011_100#); -- Modrm: SIB, no disp Gen_8 (2#00_100_100#); -- SIB: SS=0, no index, base=esp End_Insn; else pragma Assert (Reg in Regs_Xmm); Start_Insn; Gen_SSE_Prefix (Mode); Gen_SSE_Opc (Opc_Movsd_M64_Xmm); Gen_8 (To_Reg_Xmm (Reg) * 8 + 2#00_000_100#); -- Modrm: [--] Gen_8 (2#00_100_100#); -- SIB: SS=0, no index, base=esp End_Insn; end if; end Emit_Push_Fp; function Prepare_Label (Label : O_Enode) return Symbol is Sym : Symbol; begin Sym := Get_Label_Symbol (Label); if Sym = Null_Symbol then Sym := Create_Local_Symbol; Set_Label_Symbol (Label, Sym); end if; return Sym; end Prepare_Label; procedure Emit_Jmp_T (Stmt : O_Enode; Reg : O_Reg) is Sym : Symbol; Val : Pc_Type; Opc : Byte; begin Sym := Prepare_Label (Get_Jump_Label (Stmt)); Val := Get_Symbol_Value (Sym); Start_Insn; Opc := To_Cond (Reg); if Val = 0 then -- Assume long jmp. Gen_8 (Opc_0f); Gen_8 (Opc2_0f_Jcc + Opc); Gen_X86_Pc32 (Sym, 0); else if Val + 128 < Get_Current_Pc + 4 then -- Long jmp. Gen_8 (Opc_0f); Gen_8 (Opc2_0f_Jcc + Opc); Gen_32 (To_Unsigned_32 (Val - (Get_Current_Pc + 4))); else -- short jmp. Gen_8 (Opc_Jcc + Opc); Gen_8 (Byte (Val - (Get_Current_Pc + 1))); end if; end if; End_Insn; end Emit_Jmp_T; procedure Emit_Jmp (Stmt : O_Enode) is Sym : Symbol; Val : Pc_Type; begin Sym := Prepare_Label (Get_Jump_Label (Stmt)); Val := Get_Symbol_Value (Sym); Start_Insn; if Val = 0 then -- Assume long jmp. Gen_8 (Opc_Jmp_Long); Gen_X86_Pc32 (Sym, 0); else if Val + 128 < Get_Current_Pc + 4 then -- Long jmp. Gen_8 (Opc_Jmp_Long); Gen_32 (To_Unsigned_32 (Val - (Get_Current_Pc + 4))); else -- short jmp. Gen_8 (Opc_Jmp_Short); Gen_8 (Byte ((Val - (Get_Current_Pc + 1)) and 16#Ff#)); end if; end if; End_Insn; end Emit_Jmp; procedure Emit_Label (Stmt : O_Enode) is Sym : Symbol; begin Sym := Prepare_Label (Stmt); Set_Symbol_Pc (Sym, False); end Emit_Label; procedure Gen_Call (Sym : Symbol) is begin Start_Insn; Gen_8 (Opc_Call); Gen_X86_Pc32 (Sym, 0); End_Insn; end Gen_Call; procedure Emit_Stack_Adjust (Stmt : O_Enode) is Val : constant Int32 := Get_Stack_Adjust (Stmt); begin if Val > 0 then -- subl esp, val Emit_Subl_Sp_Imm (Byte (Val)); elsif Val < 0 then Start_Insn; Init_Modrm_Reg (R_Sp, Sz_Ptr); Gen_Insn_Grp1 (Opc2_Grp1_Add, -Val); End_Insn; end if; end Emit_Stack_Adjust; procedure Emit_Call (Stmt : O_Enode) is Subprg : constant O_Dnode := Get_Call_Subprg (Stmt); Sym : constant Symbol := Get_Decl_Symbol (Subprg); Mode : constant Mode_Type := Get_Expr_Mode (Stmt); begin Gen_Call (Sym); if Abi.Flag_Sse2 and then not Flags.M64 and then Mode in Mode_Fp then -- Convert return value from St0 to Xmm0. declare Sslot : constant Int32 := -Int32 (Cur_Subprg.Target.Fp_Slot); begin -- Move from St0 to Xmm0. -- fstp slot(%ebp) Start_Insn; Init_Modrm_Offset (R_Bp, Sslot, Sz_Fp); Gen_8 (2#11011_001# + Mode_Fp_To_Mf (Mode)); Gen_Mod_Rm_Opc (2#00_011_000#); End_Insn; -- movsd slot(%ebp), %xmm0 Start_Insn; Gen_SSE_Prefix (Mode); Init_Modrm_Offset (R_Bp, Sslot, Sz_Fp); Gen_SSE_Opc (Opc_Movsd_Xmm_M64); Gen_Mod_Rm_Opc (2#00_000_000#); End_Insn; end; end if; end Emit_Call; procedure Emit_Intrinsic (Stmt : O_Enode) is Op : constant Int32 := Get_Intrinsic_Operation (Stmt); begin -- Call sym Gen_Call (Intrinsics_Symbol (Op)); -- addl esp, val Emit_Addl_Sp_Imm (16); end Emit_Intrinsic; procedure Emit_Setcc (Dest : O_Enode; Cond : O_Reg) is begin pragma Assert (Cond in Regs_Cc); Start_Insn; Init_Modrm_Expr (Dest, Sz_8); Gen_8 (Opc_0f); Gen_8 (Opc2_0f_Setcc + To_Cond (Cond)); Gen_Mod_Rm_Opc (2#000_000#); End_Insn; end Emit_Setcc; procedure Emit_Setcc_Reg (Reg : O_Reg; Cond : O_Reg) is begin pragma Assert (Cond in Regs_Cc); Start_Insn; Gen_8 (Opc_0f); Gen_8 (Opc2_0f_Setcc + To_Cond (Cond)); Gen_8 (2#11_000_000# + To_Reg32 (Reg, Sz_8)); End_Insn; end Emit_Setcc_Reg; procedure Emit_Tst (Reg : O_Reg; Sz : Insn_Size) is begin Start_Insn; Init_Modrm_Reg (Reg, Sz, Reg, Sz); Gen_Insn_Sz (Opc_Test_Rm_Reg, Sz); Gen_Mod_Rm_Reg; End_Insn; end Emit_Tst; procedure Gen_Cmp_Imm (Reg : O_Reg; Val : Int32; Sz : Insn_Size) is begin Start_Insn; Init_Modrm_Reg (Reg, Sz); Gen_Insn_Grp1 (Opc2_Grp1_Cmp, Val); End_Insn; end Gen_Cmp_Imm; procedure Emit_Spill (Stmt : O_Enode; Sz : Insn_Size) is Expr : constant O_Enode := Get_Expr_Operand (Stmt); Reg : constant O_Reg := Get_Expr_Reg (Expr); begin -- A reload is missing. pragma Assert (Reg /= R_Spill); Start_Insn; Init_Modrm_Mem (Stmt, Sz, Reg); Gen_Insn_Sz (Opc_Mov_Rm_Reg, Sz); Gen_Mod_Rm_Reg; End_Insn; end Emit_Spill; procedure Emit_Spill_Xmm (Stmt : O_Enode; Mode : Mode_Fp) is Expr : constant O_Enode := Get_Expr_Operand (Stmt); Reg : constant O_Reg := Get_Expr_Reg (Expr); begin -- A reload is missing. pragma Assert (Reg in Regs_Xmm); -- movsd Start_Insn; Gen_SSE_Prefix (Mode); Init_Modrm_Mem (Stmt, Sz_Fp, Reg); Gen_SSE_Opc (Opc_Movsd_M64_Xmm); Gen_Mod_Rm_Reg; End_Insn; end Emit_Spill_Xmm; procedure Emit_Load (Reg : O_Reg; Val : O_Enode; Sz : Insn_Size) is begin Start_Insn; Init_Modrm_Expr (Val, Sz, Reg); Gen_Insn_Sz (Opc_Mov_Reg_Rm, Sz); Gen_Mod_Rm_Reg; End_Insn; end Emit_Load; procedure Emit_Lea (Stmt : O_Enode) is Reg : constant O_Reg := Get_Expr_Reg (Stmt); begin -- Hack: change the register to use the real address instead of it. Set_Expr_Reg (Stmt, R_Mem); Start_Insn; Init_Modrm_Mem (Stmt, Sz_Ptr, Reg); Gen_8 (Opc_Leal_Reg_Rm); Gen_Mod_Rm_Reg; End_Insn; -- Restore. Set_Expr_Reg (Stmt, Reg); end Emit_Lea; procedure Gen_Umul (Stmt : O_Enode; Sz : Insn_Size) is begin pragma Assert (Get_Expr_Reg (Get_Expr_Left (Stmt)) = R_Ax); Start_Insn; Init_Modrm_Expr (Get_Expr_Right (Stmt), Sz); Gen_Insn_Sz (Opc_Grp3_Width, Sz); Gen_Mod_Rm_Opc (Opc2_Grp3_Mul); End_Insn; end Gen_Umul; procedure Gen_Mul (Stmt : O_Enode; Sz : Insn_Size) is Reg : constant O_Reg := Get_Expr_Reg (Stmt); Right : constant O_Enode := Get_Expr_Right (Stmt); Reg_R : O_Reg; begin pragma Assert (Get_Expr_Reg (Get_Expr_Left (Stmt)) = Reg); Start_Insn; if Reg = R_Ax then Init_Modrm_Expr (Right, Sz); Gen_Insn_Sz (Opc_Grp3_Width, Sz); Gen_Mod_Rm_Opc (Opc2_Grp3_Mul); else Reg_R := Get_Expr_Reg (Right); case Reg_R is when R_Imm => Init_Modrm_Reg (Reg, Sz, Reg, Sz); if Is_Imm8 (Right, Sz) then Gen_8 (Opc_Imul_Reg_Rm_Imm8); Gen_Mod_Rm_Reg; Gen_Imm8 (Right, Sz); else Gen_8 (Opc_Imul_Reg_Rm_Imm32); Gen_Mod_Rm_Reg; Gen_Imm (Right, Sz); end if; when R_Mem | R_Spill | Regs_R64 => Init_Modrm_Expr (Right, Sz, Reg); Gen_8 (Opc_0f); Gen_8 (Opc2_0f_Imul); Gen_Mod_Rm_Reg; when others => Error_Emit ("gen_mul", Stmt); end case; end if; End_Insn; end Gen_Mul; -- Do not trap if COND is true. procedure Gen_Ov_Check (Cond : O_Reg) is begin -- JXX +2 Gen_2 (Opc_Jcc + To_Cond (Cond), 16#02#); -- INT 4 (overflow). Gen_2 (Opc_Int, 16#04#); end Gen_Ov_Check; procedure Gen_Into is begin if Flags.M64 then Gen_Ov_Check (R_No); else Gen_1 (Opc_Into); end if; end Gen_Into; procedure Emit_Abs (Val : O_Enode; Mode : Mode_Type) is Szl, Szh : Insn_Size; Pc_Jmp : Pc_Type; begin case Mode is when Mode_I32 => Szh := Sz_32; Szl := Sz_32; when Mode_I64 => if Flags.M64 then Szh := Sz_64; Szl := Sz_64; else Szh := Sz_32h; Szl := Sz_32l; end if; when others => raise Program_Error; end case; Emit_Tst (Get_Expr_Reg (Val), Szh); -- JGE xxx (skip if positive). Gen_2 (Opc_Jcc + To_Cond (R_Sge), 0); Pc_Jmp := Get_Current_Pc; -- NEG Gen_Grp3_Insn (Opc2_Grp3_Neg, Val, Szl); if (not Flags.M64) and Mode = Mode_I64 then -- Propagate carry. -- Adc reg,0 -- neg reg Start_Insn; Init_Modrm_Expr (Val, Sz_32h); Gen_Insn_Grp1 (Opc2_Grp1_Adc, 0); End_Insn; Gen_Grp3_Insn (Opc2_Grp3_Neg, Val, Sz_32h); end if; Gen_Into; Patch_8 (Pc_Jmp - 1, Unsigned_8 (Get_Current_Pc - Pc_Jmp)); end Emit_Abs; procedure Gen_Alloca (Stmt : O_Enode) is Reg : constant O_Reg := Get_Expr_Reg (Get_Expr_Operand (Stmt)); begin pragma Assert (Reg in Regs_R64); pragma Assert (Reg = Get_Expr_Reg (Stmt)); -- Align stack on word. -- Add reg, (stack_boundary - 1) Start_Insn; Gen_Rex_B (Reg, Sz_Ptr); Gen_8 (Opc_Grp1v_Rm_Imm8); Gen_8 (Opc2_Grp1_Add or 2#11_000_000# or To_Reg32 (Reg)); Gen_8 (Byte (X86.Flags.Stack_Boundary - 1)); End_Insn; -- and reg, ~(stack_boundary - 1) Start_Insn; Gen_Rex_B (Reg, Sz_Ptr); Gen_8 (Opc_Grp1v_Rm_Imm32); Gen_8 (Opc2_Grp1_And or 2#11_000_000# or To_Reg32 (Reg)); Gen_32 (not (X86.Flags.Stack_Boundary - 1)); End_Insn; if X86.Flags.Flag_Alloca_Call then Gen_Call (Chkstk_Symbol); else -- subl esp, reg Start_Insn; Gen_Rex_B (Reg, Sz_Ptr); Gen_8 (Opc_Subl_Reg_Rm); Gen_8 (2#11_100_000# + To_Reg32 (Reg)); End_Insn; end if; -- movl reg, esp Start_Insn; Gen_Rex_B (Reg, Sz_Ptr); Gen_8 (Opc_Mov_Rm_Reg + 1); Gen_8 (2#11_100_000# + To_Reg32 (Reg)); End_Insn; end Gen_Alloca; -- Byte/word to long. procedure Gen_Movzx (Reg : Regs_R64; Op : O_Enode; Dst_Sz : Insn_Size) is begin Start_Insn; Init_Modrm_Expr (Op, Dst_Sz, Reg); Gen_8 (Opc_0f); case Get_Expr_Mode (Op) is when Mode_I8 | Mode_U8 | Mode_B2 => Gen_8 (Opc2_0f_Movzx); when Mode_I16 | Mode_U16 => Gen_8 (Opc2_0f_Movzx + 1); when others => raise Program_Error; end case; Gen_Mod_Rm_Reg; End_Insn; end Gen_Movzx; procedure Gen_Movsxd (Src : O_Reg; Dst : O_Reg) is begin Start_Insn; Init_Modrm_Reg (Src, Sz_64, Dst, Sz_64); Gen_8 (Opc_Movsxd_Reg_Rm); Gen_Mod_Rm_Reg; End_Insn; end Gen_Movsxd; procedure Emit_Move (Operand : O_Enode; Sz : Insn_Size; Reg : O_Reg) is begin -- mov REG, OP Start_Insn; Init_Modrm_Expr (Operand, Sz, Reg); Gen_Insn_Sz (Opc_Mov_Reg_Rm, Sz); Gen_Mod_Rm_Reg; End_Insn; end Emit_Move; procedure Emit_Move_Xmm (Operand : O_Enode; Mode : Mode_Fp; Reg : O_Reg) is begin -- movsd REG, OP Start_Insn; Gen_SSE_Prefix (Mode); Init_Modrm_Expr (Operand, Sz_Fp, Reg); Gen_SSE_Opc (Opc_Movsd_Xmm_M64); Gen_Mod_Rm_Reg; End_Insn; end Emit_Move_Xmm; -- Convert U32 to xx. procedure Gen_Conv_U32 (Stmt : O_Enode) is Op : constant O_Enode := Get_Expr_Operand (Stmt); Reg_Op : constant O_Reg := Get_Expr_Reg (Op); Reg_Res : constant O_Reg := Get_Expr_Reg (Stmt); begin case Get_Expr_Mode (Stmt) is when Mode_I32 => pragma Assert (Reg_Res in Regs_R32); if Reg_Op /= Reg_Res then Emit_Load (Reg_Res, Op, Sz_32); end if; Emit_Tst (Reg_Res, Sz_32); Gen_Ov_Check (R_Sge); when Mode_I64 => if Flags.M64 then Emit_Move (Op, Sz_32, Reg_Res); else pragma Assert (Reg_Res = R_Edx_Eax); pragma Assert (Reg_Op = R_Ax); -- Clear edx. Gen_Clear_Edx; end if; when Mode_U8 | Mode_B2 => pragma Assert (Reg_Res in Regs_R32); if Reg_Op /= Reg_Res then Emit_Load (Reg_Res, Op, Sz_32); end if; -- cmpl VAL, 0xff Start_Insn; Init_Modrm_Expr (Op, Sz_32); Gen_8 (Opc_Grp1v_Rm_Imm32); Gen_Mod_Rm_Opc (Opc2_Grp1_Cmp); Gen_32 (16#00_00_00_Ff#); End_Insn; Gen_Ov_Check (R_Ule); when others => Error_Emit ("gen_conv_u32", Stmt); end case; end Gen_Conv_U32; -- Convert I32 to xxx procedure Gen_Conv_I32 (Stmt : O_Enode) is Op : constant O_Enode := Get_Expr_Operand (Stmt); Reg_Op : constant O_Reg := Get_Expr_Reg (Op); Reg_Res : constant O_Reg := Get_Expr_Reg (Stmt); begin case Get_Expr_Mode (Stmt) is when Mode_I64 => if Flags.M64 then Gen_Movsxd (Reg_Op, Reg_Res); else pragma Assert (Reg_Res = R_Edx_Eax); pragma Assert (Reg_Op = R_Ax); Gen_Cdq (Sz_32); end if; when Mode_U32 => pragma Assert (Reg_Res in Regs_R32); if Reg_Op /= Reg_Res then Emit_Load (Reg_Res, Op, Sz_32); end if; Emit_Tst (Reg_Res, Sz_32); Gen_Ov_Check (R_Sge); when Mode_B2 => if Reg_Op /= Reg_Res then Emit_Load (Reg_Res, Op, Sz_32); end if; Gen_Cmp_Imm (Reg_Res, 1, Sz_32); Gen_Ov_Check (R_Ule); when Mode_U8 => if Reg_Op /= Reg_Res then Emit_Load (Reg_Res, Op, Sz_32); end if; Gen_Cmp_Imm (Reg_Res, 16#Ff#, Sz_32); Gen_Ov_Check (R_Ule); when Mode_F64 => if Reg_Res in Regs_Xmm then -- cvtsi2sd Gen_SSE_Prefix (Mode_F64); Init_Modrm_Expr (Op, Sz_32, Reg_Res); Gen_SSE_Opc (Opc_Cvtsi2sd_Xmm_Rm); Gen_Mod_Rm_Reg; End_Insn; else Emit_Push (Op, Sz_32); -- fild (%esp) Start_Insn; Gen_8 (2#11011_011#); Gen_8 (2#00_000_100#); Gen_8 (2#00_100_100#); End_Insn; -- addl %esp, 4 Emit_Addl_Sp_Imm (4); end if; when others => Error_Emit ("gen_conv_i32", Stmt); end case; end Gen_Conv_I32; -- Convert U8 to xxx procedure Gen_Conv_U8 (Stmt : O_Enode) is Mode : constant Mode_Type := Get_Expr_Mode (Stmt); Op : constant O_Enode := Get_Expr_Operand (Stmt); Reg_Res : constant O_Reg := Get_Expr_Reg (Stmt); Reg_Op : constant O_Reg := Get_Expr_Reg (Op); begin case Mode is when Mode_U32 | Mode_I32 | Mode_U16 | Mode_I16 => pragma Assert (Reg_Res in Regs_R64); Gen_Movzx (Reg_Res, Op, Int_Mode_To_Size (Mode)); when Mode_I64 | Mode_U64 => if Flags.M64 then Gen_Movzx (Reg_Res, Op, Sz_64); else pragma Assert (Reg_Res = R_Edx_Eax); pragma Assert (Reg_Op = R_Ax); Gen_Movzx (R_Ax, Op, Sz_32); -- Sign-extend, but we know the sign is positive. Gen_Cdq (Sz_32); end if; when others => Error_Emit ("gen_conv_U8", Stmt); end case; end Gen_Conv_U8; -- Convert B2 to xxx procedure Gen_Conv_B2 (Stmt : O_Enode) is Mode : constant Mode_Type := Get_Expr_Mode (Stmt); Op : constant O_Enode := Get_Expr_Operand (Stmt); Reg_Op : constant O_Reg := Get_Expr_Reg (Op); Reg_Res : constant O_Reg := Get_Expr_Reg (Stmt); begin case Mode is when Mode_U32 | Mode_I32 | Mode_U16 | Mode_I16 => pragma Assert (Reg_Res in Regs_R64); Gen_Movzx (Reg_Res, Op, Int_Mode_To_Size (Mode)); when Mode_I64 => if Flags.M64 then Gen_Movzx (Reg_Res, Op, Sz_64); else pragma Assert (Reg_Res = R_Edx_Eax); pragma Assert (Reg_Op = R_Ax); Gen_Movzx (R_Ax, Op, Sz_32); -- Sign-extend, but we know the sign is positive. Gen_Cdq (Sz_32); end if; when others => Error_Emit ("gen_conv_B2", Stmt); end case; end Gen_Conv_B2; -- Convert I64 to xxx procedure Gen_Conv_I64 (Stmt : O_Enode) is Mode : constant Mode_Type := Get_Expr_Mode (Stmt); Op : constant O_Enode := Get_Expr_Operand (Stmt); Reg_Op : constant O_Reg := Get_Expr_Reg (Op); Reg_Res : constant O_Reg := Get_Expr_Reg (Stmt); begin case Mode is when Mode_I32 => if Flags.M64 then -- movsxd src, dst Gen_Movsxd (Reg_Op, Reg_Res); -- cmp src,dst Start_Insn; Init_Modrm_Reg (Reg_Op, Sz_64, Reg_Res, Sz_64); Gen_8 (Opc_Cmpl_Rm_Reg); Gen_Mod_Rm_Reg; End_Insn; else pragma Assert (Reg_Op = R_Edx_Eax); pragma Assert (Reg_Res = R_Ax); -- move dx to reg_helper Start_Insn; Gen_8 (Opc_Mov_Rm_Reg + 1); Gen_8 (2#11_010_000# + To_Reg32 (Reg_Helper)); End_Insn; -- Sign extend eax. Gen_Cdq (Sz_32); -- cmp reg_helper, dx Start_Insn; Gen_8 (Opc_Cmpl_Rm_Reg); Gen_8 (2#11_010_000# + To_Reg32 (Reg_Helper)); End_Insn; end if; -- Overflow if extended value is different from initial value. Gen_Ov_Check (R_Eq); when Mode_U8 | Mode_B2 => declare Ubound : Int32; begin if Mode = Mode_B2 then Ubound := 1; else Ubound := 16#ff#; end if; if Flags.M64 then Emit_Load (Reg_Res, Op, Sz_64); Start_Insn; Init_Modrm_Reg (Reg_Res, Sz_64); Gen_Insn_Grp1 (Opc2_Grp1_Cmp, Ubound); End_Insn; else pragma Assert (Reg_Op in Regs_Pair); -- Check MSB = 0 Emit_Tst (Reg_Op, Sz_32h); Gen_Ov_Check (R_Eq); -- Check LSB <= 255 (U8) or LSB <= 1 (B2) if Reg_Op /= Reg_Res then -- Move reg_op -> reg_res -- FIXME: factorize with OE_Mov. Start_Insn; Init_Modrm_Reg (Reg_Op, Sz_32l, Reg_Res); Gen_Insn_Sz (Opc_Mov_Reg_Rm, Sz_32); Gen_Mod_Rm_Reg; End_Insn; end if; Gen_Cmp_Imm (Reg_Res, Ubound, Sz_32); end if; end; Gen_Ov_Check (R_Ule); when Mode_F64 => if Flags.M64 then -- cvtsi2sd Gen_SSE_Prefix (Mode_F64); Init_Modrm_Expr (Op, Sz_64, Reg_Res); Gen_SSE_Opc (Opc_Cvtsi2sd_Xmm_Rm); Gen_Mod_Rm_Reg; End_Insn; else Emit_Push (Op, Sz_32h); Emit_Push (Op, Sz_32l); -- fild (%esp) Start_Insn; Gen_8 (2#11011_111#); Gen_8 (2#00_101_100#); Gen_8 (2#00_100_100#); End_Insn; if Reg_Res in Regs_Xmm then -- fstp (%esp) Start_Insn; Gen_8 (2#11011_00_1# + Mode_Fp_To_Mf (Mode_F64)); Gen_8 (2#00_011_100#); Gen_8 (2#00_100_100#); End_Insn; -- movsd (%esp), %xmm Start_Insn; Gen_SSE_Prefix (Mode_F64); Gen_SSE_Opc (Opc_Movsd_Xmm_M64); Gen_8 (To_Reg_Xmm (Reg_Res) * 8 + 2#00_000_100#); Gen_8 (2#00_100_100#); End_Insn; end if; -- addl %esp, 8 Emit_Addl_Sp_Imm (8); end if; when others => Error_Emit ("gen_conv_I64", Stmt); end case; end Gen_Conv_I64; -- Convert FP to xxx. procedure Gen_Conv_Fp (Stmt : O_Enode) is Mode : constant Mode_Type := Get_Expr_Mode (Stmt); Reg : constant O_Reg := Get_Expr_Reg (Stmt); Reg_Op : constant O_Reg := Get_Expr_Reg (Get_Expr_Operand (Stmt)); Sslot : constant Int32 := -Int32 (Cur_Subprg.Target.Fp_Slot); begin if Abi.Flag_Sse2 and then (Mode = Mode_I32 or (Flags.M64 and Mode = Mode_I64)) then -- cvtsd2si Gen_SSE_Prefix (Mode_F64); Init_Modrm_Reg (Reg_Op, Int_Mode_To_Size (Mode), Reg); Gen_SSE_Opc (Opc_Cvtsd2si_Reg_Xm); Gen_Mod_Rm_Reg; End_Insn; return; end if; if Reg_Op in Regs_Xmm then -- movsd %xmm, (%ebp), Start_Insn; Gen_SSE_Prefix (Mode_F64); Init_Modrm_Offset (R_Bp, Sslot, Sz_Ptr, Reg_Op); Gen_SSE_Opc (Opc_Movsd_M64_Xmm); Gen_Mod_Rm_Reg; End_Insn; -- fldl slot(%ebp) Start_Insn; Init_Modrm_Offset (R_Bp, Sslot, Sz_Ptr); Gen_8 (2#11011_00_1# + Mode_Fp_To_Mf (Mode_F64)); Gen_Mod_Rm_Opc (2#00_000_000#); End_Insn; end if; case Mode is when Mode_I32 => -- fistpl slot(%ebp) Start_Insn; Init_Modrm_Offset (R_Bp, Sslot, Sz_32); Gen_8 (2#11011_011#); Gen_Mod_Rm_Opc (2#00_011_000#); End_Insn; -- movl slot(%ebp), reg Start_Insn; Init_Modrm_Offset (R_Bp, Sslot, Sz_32, Reg); Gen_8 (Opc_Movl_Reg_Rm); Gen_Mod_Rm_Reg; End_Insn; when Mode_I64 => -- fistpq slot(%ebp) Start_Insn; Init_Modrm_Offset (R_Bp, Sslot, Sz_32); Gen_8 (2#11011_111#); Gen_Mod_Rm_Opc (2#00_111_000#); End_Insn; -- movl slot(%ebp), reg for Sz in Sz_32l .. Sz_32h loop Start_Insn; Init_Modrm_Offset (R_Bp, Sslot, Sz, Reg); Gen_8 (Opc_Movl_Reg_Rm); Gen_Mod_Rm_Reg; End_Insn; end loop; when others => Error_Emit ("gen_conv_fp", Stmt); end case; end Gen_Conv_Fp; procedure Gen_Grp1_Insn_Mode (Stmt : O_Enode; Cl : Byte; Ch : Byte) is begin case Get_Expr_Mode (Stmt) is when Mode_U32 | Mode_I32 | Mode_P32 => Gen_Grp1_Insn (Cl, Stmt, Sz_32); when Mode_I64 | Mode_U64 => if Flags.M64 then Gen_Grp1_Insn (Cl, Stmt, Sz_64); else Gen_Grp1_Insn (Cl, Stmt, Sz_32l); Gen_Grp1_Insn (Ch, Stmt, Sz_32h); end if; when Mode_B2 | Mode_I8 | Mode_U8 => Gen_Grp1_Insn (Cl, Stmt, Sz_8); when others => Error_Emit ("gen_grp1_insn_mode", Stmt); end case; end Gen_Grp1_Insn_Mode; procedure Gen_Check_Overflow (Mode : Mode_Type) is begin case Mode is when Mode_I32 | Mode_I64 | Mode_I8 => Gen_Into; when Mode_U64 | Mode_U32 | Mode_U8 => -- FIXME: check no carry. null; when Mode_B2 => null; when others => raise Program_Error; end case; end Gen_Check_Overflow; procedure Gen_Emit_Fp_Op (Stmt : O_Enode; Fp_Op : Byte) is Right : constant O_Enode := Get_Expr_Right (Stmt); Reg : constant O_Reg := Get_Expr_Reg (Right); B_Size : Byte; begin Start_Insn; case Reg is when R_St0 => Gen_8 (2#11011_110#); Gen_8 (2#11_000_001# or Fp_Op); when R_Mem => case Get_Expr_Mode (Stmt) is when Mode_F32 => B_Size := 0; when Mode_F64 => B_Size := 2#100#; when others => raise Program_Error; end case; Init_Modrm_Mem (Right, Sz_Ptr); Gen_8 (2#11011_000# or B_Size); Gen_Mod_Rm_Opc (Fp_Op); when others => raise Program_Error; end case; End_Insn; end Gen_Emit_Fp_Op; procedure Gen_Emit_Fp_Or_Xmm_Op (Stmt : O_Enode; Fp_Op : Byte; Xmm_Op : Byte) is Reg : constant O_Reg := Get_Expr_Reg (Stmt); begin if Reg in Regs_Xmm then declare Mode : constant Mode_Type := Get_Expr_Mode (Stmt); Right : constant O_Enode := Get_Expr_Right (Stmt); begin Start_Insn; Gen_SSE_Prefix (Mode); Init_Modrm_Expr (Right, Sz_32, Reg); Gen_SSE_Opc (Xmm_Op); Gen_Mod_Rm_Reg; End_Insn; end; else Gen_Emit_Fp_Op (Stmt, Fp_Op); end if; end Gen_Emit_Fp_Or_Xmm_Op; procedure Emit_Mod (Stmt : O_Enode; Sz : Insn_Size) is Right : O_Enode; Pc1, Pc2, Pc3: Pc_Type; begin -- a : EAX -- d : EDX -- b : Rm -- d := Rm -- d := d ^ a -- cltd -- if cc < 0 then -- idiv b -- if edx /= 0 then -- edx := edx + b -- end if -- else -- idiv b -- end if Right := Get_Expr_Right (Stmt); -- %edx <- right Emit_Load (R_Dx, Right, Sz); -- xorl %eax -> %edx Start_Insn; Gen_Rex_B (R_None, Sz); Gen_8 (Opc_Xorl_Rm_Reg); Gen_8 (2#11_000_010#); End_Insn; Gen_Cdq (Sz); -- js Gen_2 (Opc_Jcc + 2#1000#, 0); Pc1 := Get_Current_Pc; -- idiv Gen_Grp3_Insn (Opc2_Grp3_Idiv, Right, Sz); -- jmp Gen_2 (Opc_Jmp_Short, 0); Pc2 := Get_Current_Pc; Patch_8 (Pc1 - 1, Unsigned_8 (Get_Current_Pc - Pc1)); -- idiv Gen_Grp3_Insn (Opc2_Grp3_Idiv, Right, Sz); -- tstl %edx,%edx Start_Insn; Gen_Rex_B (R_None, Sz); Gen_8 (Opc_Test_Rm_Reg + 1); Gen_8 (2#11_010_010#); End_Insn; -- jz Gen_2 (Opc_Jcc + 2#0100#, 0); Pc3 := Get_Current_Pc; -- addl b, %edx Start_Insn; Init_Modrm_Expr (Right, Sz, R_Dx); Gen_8 (Opc_Addl_Reg_Rm); Gen_Mod_Rm_Reg; End_Insn; Patch_8 (Pc2 - 1, Unsigned_8 (Get_Current_Pc - Pc2)); Patch_8 (Pc3 - 1, Unsigned_8 (Get_Current_Pc - Pc3)); end Emit_Mod; procedure Emit_Insn (Stmt : O_Enode) is use Ortho_Code.Flags; Kind : constant OE_Kind := Get_Expr_Kind (Stmt); Mode : constant Mode_Type := Get_Expr_Mode (Stmt); Reg : O_Reg; begin case Kind is when OE_Beg => if Flag_Debug /= Debug_None then Decls.Set_Block_Info1 (Get_Block_Decls (Stmt), Int32 (Get_Current_Pc - Subprg_Pc)); end if; when OE_End => if Flag_Debug /= Debug_None then Decls.Set_Block_Info2 (Get_Block_Decls (Get_End_Beg (Stmt)), Int32 (Get_Current_Pc - Subprg_Pc)); end if; when OE_Leave => null; when OE_BB => null; when OE_Add_Ov => if Mode in Mode_Fp then Gen_Emit_Fp_Or_Xmm_Op (Stmt, 2#000_000#, 16#58#); else Gen_Grp1_Insn_Mode (Stmt, Opc2_Grp1_Add, Opc2_Grp1_Adc); Gen_Check_Overflow (Mode); end if; when OE_Or => Gen_Grp1_Insn_Mode (Stmt, Opc2_Grp1_Or, Opc2_Grp1_Or); when OE_And => Gen_Grp1_Insn_Mode (Stmt, Opc2_Grp1_And, Opc2_Grp1_And); when OE_Xor => Gen_Grp1_Insn_Mode (Stmt, Opc2_Grp1_Xor, Opc2_Grp1_Xor); when OE_Sub_Ov => if Mode in Mode_Fp then Gen_Emit_Fp_Or_Xmm_Op (Stmt, 2#100_000#, 16#5c#); else Gen_Grp1_Insn_Mode (Stmt, Opc2_Grp1_Sub, Opc2_Grp1_Sbb); Gen_Check_Overflow (Mode); end if; when OE_Mul_Ov | OE_Mul => case Mode is when Mode_U8 => Gen_Umul (Stmt, Sz_8); when Mode_U16 => Gen_Umul (Stmt, Sz_16); when Mode_U32 => Gen_Mul (Stmt, Sz_32); when Mode_I32 => Gen_Grp3_Insn (Opc2_Grp3_Imul, Get_Expr_Right (Stmt), Sz_32); if Kind = OE_Mul_Ov then Gen_Check_Overflow (Mode); end if; when Mode_I64 => Gen_Grp3_Insn (Opc2_Grp3_Imul, Get_Expr_Right (Stmt), Sz_64); if Kind = OE_Mul_Ov then Gen_Check_Overflow (Mode); end if; when Mode_U64 => pragma Assert (Flags.M64); Gen_Mul (Stmt, Sz_64); when Mode_F32 | Mode_F64 => Gen_Emit_Fp_Or_Xmm_Op (Stmt, 2#001_000#, 16#59#); when others => Error_Emit ("emit_insn: mul_ov", Stmt); end case; when OE_Shl => declare Right : O_Enode; Sz : Insn_Size; Val : Uns32; begin case Mode is when Mode_U32 => Sz := Sz_32; when others => Error_Emit ("emit_insn: shl", Stmt); end case; Right := Get_Expr_Right (Stmt); if Get_Expr_Kind (Right) = OE_Const then Val := Get_Expr_Low (Right); Start_Insn; Init_Modrm_Expr (Get_Expr_Left (Stmt), Sz); if Val = 1 then Gen_Insn_Sz (2#1101000_0#, Sz); Gen_Mod_Rm_Opc (2#100_000#); else Gen_Insn_Sz (2#1100000_0#, Sz); Gen_Mod_Rm_Opc (2#100_000#); Gen_8 (Byte (Val and 31)); end if; End_Insn; else pragma Assert (Get_Expr_Reg (Right) = R_Cx); Start_Insn; Init_Modrm_Expr (Get_Expr_Left (Stmt), Sz); Gen_Insn_Sz (2#1101001_0#, Sz); Gen_Mod_Rm_Opc (2#100_000#); End_Insn; end if; end; when OE_Mod | OE_Rem | OE_Div_Ov => case Mode is when Mode_U32 | Mode_U64 => Gen_Clear_Edx; Gen_Grp3_Insn (Opc2_Grp3_Div, Get_Expr_Right (Stmt), Int_Mode_To_Size (Mode)); when Mode_I32 | Mode_I64 => declare Sz : constant Insn_Size := Int_Mode_To_Size (Mode); begin if Kind = OE_Mod then Emit_Mod (Stmt, Sz); else Gen_Cdq (Sz); Gen_Grp3_Insn (Opc2_Grp3_Idiv, Get_Expr_Right (Stmt), Sz); end if; end; when Mode_F32 | Mode_F64 => -- No Mod or Rem for fp types. pragma Assert (Kind = OE_Div_Ov); Gen_Emit_Fp_Or_Xmm_Op (Stmt, 2#110_000#, 16#5e#); when others => Error_Emit ("emit_insn: mod_ov", Stmt); end case; when OE_Not => case Mode is when Mode_B2 => -- Xor VAL, $1 Start_Insn; Init_Modrm_Expr (Stmt, Sz_8); Gen_8 (Opc_Grp1v_Rm_Imm8); Gen_Mod_Rm_Opc (Opc2_Grp1_Xor); Gen_8 (16#01#); End_Insn; when Mode_U8 => Gen_Grp3_Insn_Stmt (Opc2_Grp3_Not, Stmt, Sz_8); when Mode_U16 => Gen_Grp3_Insn_Stmt (Opc2_Grp3_Not, Stmt, Sz_16); when Mode_U32 => Gen_Grp3_Insn_Stmt (Opc2_Grp3_Not, Stmt, Sz_32); when Mode_U64 => if Flags.M64 then Gen_Grp3_Insn_Stmt (Opc2_Grp3_Not, Stmt, Sz_64); else Gen_Grp3_Insn_Stmt (Opc2_Grp3_Not, Stmt, Sz_32l); Gen_Grp3_Insn_Stmt (Opc2_Grp3_Not, Stmt, Sz_32h); end if; when others => Error_Emit ("emit_insn: not", Stmt); end case; when OE_Neg_Ov => case Mode is when Mode_I8 => Gen_Grp3_Insn_Stmt (Opc2_Grp3_Neg, Stmt, Sz_8); --Gen_Into; when Mode_I16 => Gen_Grp3_Insn_Stmt (Opc2_Grp3_Neg, Stmt, Sz_16); --Gen_Into; when Mode_I32 => Gen_Grp3_Insn_Stmt (Opc2_Grp3_Neg, Stmt, Sz_32); --Gen_Into; when Mode_I64 => if Flags.M64 then Gen_Grp3_Insn_Stmt (Opc2_Grp3_Neg, Stmt, Sz_64); else Gen_Grp3_Insn_Stmt (Opc2_Grp3_Neg, Stmt, Sz_32l); -- adcl 0, high Start_Insn; Init_Modrm_Expr (Get_Expr_Operand (Stmt), Sz_32h); Gen_8 (Opc_Grp1v_Rm_Imm8); Gen_Mod_Rm_Opc (Opc2_Grp1_Adc); Gen_8 (0); End_Insn; Gen_Grp3_Insn_Stmt (Opc2_Grp3_Neg, Stmt, Sz_32h); --Gen_Into; end if; when Mode_F32 | Mode_F64 => Reg := Get_Expr_Reg (Stmt); if Reg in Regs_Xmm then -- Xorp{sd} reg, cst Start_Insn; Init_Modrm_Sym (Get_Xmm_Sign_Constant (Mode), Sz_32, Reg); Gen_SSE_D16_Opc (Mode, Opc2_0f_Xorp); Gen_Mod_Rm_Reg; End_Insn; else -- fchs Gen_2 (2#11011_001#, 2#1110_0000#); end if; when others => Error_Emit ("emit_insn: neg_ov", Stmt); end case; when OE_Abs_Ov => case Mode is when Mode_I32 | Mode_I64 => Emit_Abs (Get_Expr_Operand (Stmt), Mode); when Mode_F32 | Mode_F64 => Reg := Get_Expr_Reg (Stmt); if Reg in Regs_Xmm then -- Andp{sd} reg, cst Start_Insn; Init_Modrm_Sym (Get_Xmm_Mask_Constant (Mode), Sz_32, Reg); Gen_SSE_D16_Opc (Mode, Opc2_0f_Andp); Gen_Mod_Rm_Reg; End_Insn; else -- fabs Gen_2 (2#11011_001#, 2#1110_0001#); end if; when others => Error_Emit ("emit_insn: abs_ov", Stmt); end case; when OE_Kind_Cmp => declare Left : constant O_Enode := Get_Expr_Left (Stmt); Op_Mode : constant Mode_Type := Get_Expr_Mode (Left); begin case Op_Mode is when Mode_U32 | Mode_I32 | Mode_P32 => Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_32); when Mode_B2 | Mode_I8 | Mode_U8 => Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_8); when Mode_U64 | Mode_P64 => if Flags.M64 then Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_64); else declare Pc : Pc_Type; begin Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_32h); -- jne Gen_2 (Opc_Jcc + 2#0101#, 0); Pc := Get_Current_Pc; Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_32l); Patch_8 (Pc - 1, Unsigned_8 (Get_Current_Pc - Pc)); end; end if; when Mode_I64 => if Flags.M64 then Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_64); else declare Pc : Pc_Type; begin Reg := Get_Expr_Reg (Stmt); Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_32h); -- Note: this does not clobber a reg due to care in -- insns. Emit_Setcc_Reg (Reg, Insns.Ekind_Signed_To_Cc (Kind)); -- jne Gen_2 (Opc_Jcc + 2#0101#, 0); Pc := Get_Current_Pc; Gen_Grp1_Insn (Opc2_Grp1_Cmp, Stmt, Sz_32l); Emit_Setcc_Reg (Reg, Insns.Ekind_Unsigned_To_Cc (Kind)); Patch_8 (Pc - 1, Unsigned_8 (Get_Current_Pc - Pc)); return; end; end if; when Mode_F32 | Mode_F64 => if Abi.Flag_Sse2 then -- comisd %xmm, rm Start_Insn; Init_Modrm_Expr (Get_Expr_Right (Stmt), Sz_32, Get_Expr_Reg (Left)); Gen_SSE_D16_Opc (Op_Mode, 16#2f#); Gen_Mod_Rm_Reg; End_Insn; else -- fcomip st, st(1) Start_Insn; Gen_8 (2#11011_111#); Gen_8 (2#1111_0001#); End_Insn; -- fstp st, st (0) Start_Insn; Gen_8 (2#11011_101#); Gen_8 (2#11_011_000#); End_Insn; end if; when others => Error_Emit ("emit_insn: cmp", Stmt); end case; -- Result is in eflags. pragma Assert (Get_Expr_Reg (Stmt) in Regs_Cc); end; when OE_Addrd => pragma Assert (Mode = Abi.Mode_Ptr); if Flags.M64 and then not Insns.Is_External_Object (Get_Addr_Decl (Stmt)) then -- Use RIP relative to load an address. Emit_Lea (Stmt); else Emit_Load_Imm (Stmt, Sz_Ptr); end if; when OE_Const => case Mode is when Mode_B2 | Mode_U8 | Mode_I8 => Emit_Load_Imm (Stmt, Sz_8); when Mode_U32 | Mode_I32 | Mode_P32 => Emit_Load_Imm (Stmt, Sz_32); when Mode_I64 | Mode_U64 | Mode_P64 => if Flags.M64 then Emit_Load_Imm (Stmt, Sz_64); else pragma Assert (Mode /= Mode_P64); Emit_Load_Imm (Stmt, Sz_32l); Emit_Load_Imm (Stmt, Sz_32h); end if; when Mode_Fp => Emit_Load_Fp (Stmt, Mode); when others => Error_Emit ("emit_insn: const", Stmt); end case; when OE_Indir => case Mode is when Mode_U32 | Mode_I32 | Mode_P32 => Emit_Load_Mem (Stmt, Sz_32); when Mode_B2 | Mode_U8 | Mode_I8 => Emit_Load_Mem (Stmt, Sz_8); when Mode_U64 | Mode_I64 | Mode_P64 => if Flags.M64 then Emit_Load_Mem (Stmt, Sz_64); else pragma Assert (Mode /= Mode_P64); Emit_Load_Mem (Stmt, Sz_32l); Emit_Load_Mem (Stmt, Sz_32h); end if; when Mode_Fp => Emit_Load_Fp_Mem (Stmt, Mode); when others => Error_Emit ("emit_insn: indir", Stmt); end case; when OE_Conv => -- Call Gen_Conv_FROM case Get_Expr_Mode (Get_Expr_Operand (Stmt)) is when Mode_U32 => Gen_Conv_U32 (Stmt); when Mode_I32 => Gen_Conv_I32 (Stmt); when Mode_U8 => Gen_Conv_U8 (Stmt); when Mode_B2 => Gen_Conv_B2 (Stmt); when Mode_I64 => Gen_Conv_I64 (Stmt); when Mode_F32 | Mode_F64 => Gen_Conv_Fp (Stmt); when others => Error_Emit ("emit_insn: conv", Stmt); end case; when OE_Asgn => case Mode is when Mode_U32 | Mode_I32 | Mode_P32 => Emit_Store (Stmt, Sz_32); when Mode_B2 | Mode_U8 | Mode_I8 => Emit_Store (Stmt, Sz_8); when Mode_U64 | Mode_I64 | Mode_P64 => if Flags.M64 then Emit_Store (Stmt, Sz_64); else Emit_Store (Stmt, Sz_32l); Emit_Store (Stmt, Sz_32h); end if; when Mode_Fp => if Abi.Flag_Sse2 then Emit_Store_Xmm (Stmt, Mode); else Emit_Store_Fp (Stmt, Mode); end if; when others => Error_Emit ("emit_insn: move", Stmt); end case; when OE_Jump_F => Reg := Get_Expr_Reg (Get_Expr_Operand (Stmt)); if Reg not in Regs_Cc then Error_Emit ("emit_insn/jmp_f: not cc", Stmt); end if; Emit_Jmp_T (Stmt, Inverse_Cc (Reg)); when OE_Jump_T => Reg := Get_Expr_Reg (Get_Expr_Operand (Stmt)); if Reg not in Regs_Cc then Error_Emit ("emit_insn/jmp_t: not cc", Stmt); end if; Emit_Jmp_T (Stmt, Reg); when OE_Jump => Emit_Jmp (Stmt); when OE_Label => Emit_Label (Stmt); when OE_Ret => -- Value already set. null; when OE_Arg => -- Only arguments passed on the stack are represented by OE_Arg. -- Arguments passed by registers (for x86-64) are simply -- pre-computed. case Mode is when Mode_U32 | Mode_I32 | Mode_P32 => Emit_Push (Get_Expr_Operand (Stmt), Sz_32); when Mode_U64 | Mode_I64 | Mode_P64 => if Flags.M64 then Emit_Push (Get_Expr_Operand (Stmt), Sz_64); else Emit_Push (Get_Expr_Operand (Stmt), Sz_32h); Emit_Push (Get_Expr_Operand (Stmt), Sz_32l); end if; when Mode_Fp => Emit_Push_Fp (Get_Expr_Operand (Stmt), Mode); when others => Error_Emit ("emit_insn: oe_arg", Stmt); end case; when OE_Stack_Adjust => Emit_Stack_Adjust (Stmt); when OE_Call => Emit_Call (Stmt); when OE_Intrinsic => Emit_Intrinsic (Stmt); when OE_Move => declare Operand : constant O_Enode := Get_Expr_Operand (Stmt); Op_Reg : constant O_Reg := Get_Expr_Reg (Operand); begin Reg := Get_Expr_Reg (Stmt); case Mode is when Mode_B2 => if Reg in Regs_R64 and then Op_Reg in Regs_Cc then Emit_Setcc (Stmt, Op_Reg); elsif (Reg = R_Eq or Reg = R_Ne) and then Op_Reg in Regs_R64 then Emit_Tst (Op_Reg, Sz_8); else Error_Emit ("emit_insn: move/b2", Stmt); end if; when Mode_U32 | Mode_I32 => Emit_Move (Operand, Sz_32, Reg); when Mode_U64 | Mode_I64 | Mode_P64 => pragma Assert (Flags.M64); Emit_Move (Operand, Sz_64, Reg); when Mode_F64 | Mode_F32 => Emit_Move_Xmm (Operand, Mode, Reg); when others => Error_Emit ("emit_insn: move", Stmt); end case; end; when OE_Alloca => pragma Assert (Mode = Abi.Mode_Ptr); Gen_Alloca (Stmt); when OE_Set_Stack => Emit_Load_Mem (Stmt, Sz_Ptr); when OE_Add | OE_Addrl => case Mode is when Mode_U32 | Mode_I32 | Mode_P32 => Emit_Lea (Stmt); when Mode_U64 | Mode_I64 | Mode_P64 => pragma Assert (Flags.M64); Emit_Lea (Stmt); when others => Error_Emit ("emit_insn: oe_add", Stmt); end case; when OE_Spill => case Mode is when Mode_B2 | Mode_U8 | Mode_I8 => Emit_Spill (Stmt, Sz_8); when Mode_U32 | Mode_I32 | Mode_P32 => Emit_Spill (Stmt, Sz_32); when Mode_U64 | Mode_I64 | Mode_P64 => if Flags.M64 then Emit_Spill (Stmt, Sz_64); else Emit_Spill (Stmt, Sz_32l); Emit_Spill (Stmt, Sz_32h); end if; when Mode_F32 | Mode_F64 => Emit_Spill_Xmm (Stmt, Mode); when others => Error_Emit ("emit_insn: spill", Stmt); end case; when OE_Reload => declare Expr : constant O_Enode := Get_Expr_Operand (Stmt); begin Reg := Get_Expr_Reg (Stmt); case Mode is when Mode_B2 | Mode_U8 | Mode_I8 => Emit_Load (Reg, Expr, Sz_8); when Mode_U32 | Mode_I32 | Mode_P32 => Emit_Load (Reg, Expr, Sz_32); when Mode_U64 | Mode_I64 | Mode_P64 => if Flags.M64 then Emit_Load (Reg, Expr, Sz_64); else Emit_Load (Reg, Expr, Sz_32l); Emit_Load (Reg, Expr, Sz_32h); end if; when Mode_F32 | Mode_F64 => pragma Assert (Reg in Regs_Xmm); -- movsd Start_Insn; Gen_SSE_Prefix (Mode_F64); Init_Modrm_Mem (Expr, Sz_Fp, Reg); Gen_SSE_Opc (Opc_Movsd_Xmm_M64); Gen_Mod_Rm_Reg; End_Insn; when others => Error_Emit ("emit_insn: reload", Stmt); end case; end; when OE_Reg => Reg_Helper := Get_Expr_Reg (Stmt); when OE_Case_Expr | OE_Case => null; when OE_Line => if Flag_Debug /= Debug_None then Dwarf.Set_Line_Stmt (Get_Expr_Line_Number (Stmt)); Set_Current_Section (Sect_Text); end if; when others => Error_Emit ("cannot handle insn", Stmt); end case; end Emit_Insn; function Get_Preserved_Regs return O_Reg_Bitmap is begin if Flags.M64 then if Flags.Win64 then return Preserved_Regs_Win64; else return Preserved_Regs_Lin64; end if; else return Preserved_Regs_32; end if; end Get_Preserved_Regs; -- List of registers preserved accross calls. Preserved_Regs : constant O_Reg_Bitmap := Get_Preserved_Regs; procedure Push_Reg (Reg : Regs_R64) is begin Gen_Push_Pop_Reg (Opc_Push_Reg, Reg, Sz_Ptr); end Push_Reg; procedure Pop_Reg (Reg : Regs_R64) is begin Gen_Push_Pop_Reg (Opc_Pop_Reg, Reg, Sz_Ptr); end Pop_Reg; procedure Gen_Sub_Sp (Imm : Int32) is begin Start_Insn; Init_Modrm_Reg (R_Sp, Sz_Ptr); Gen_Insn_Grp1 (Opc2_Grp1_Sub, Imm); End_Insn; end Gen_Sub_Sp; procedure Emit_Prologue (Subprg : Subprogram_Data_Acc) is use Ortho_Code.Decls; use Ortho_Code.Flags; use Ortho_Code.X86.Insns; Sym : Symbol; Subprg_Decl : O_Dnode; Is_Global : Boolean; Frame_Size : Unsigned_32; Saved_Regs_Size : Unsigned_32; Has_Fp_Inter : Boolean; begin -- Switch to .text section and align the function (to avoid the nested -- function trick and for performance). Set_Current_Section (Sect_Text); Gen_Pow_Align (2); -- Set symbol. Subprg_Decl := Subprg.D_Decl; Sym := Get_Decl_Symbol (Subprg_Decl); case Get_Decl_Storage (Subprg_Decl) is when O_Storage_Public | O_Storage_External => -- FIXME: should not accept the external case. Is_Global := True; when others => Is_Global := False; end case; Set_Symbol_Pc (Sym, Is_Global); Subprg_Pc := Get_Current_Pc; -- Return address and saved frame pointer are preserved. Saved_Regs_Size := 2; for R in Preserved_Regs'Range loop if Preserved_Regs (R) and Reg_Used (R) then Saved_Regs_Size := Saved_Regs_Size + 1; end if; end loop; if Flags.M64 then Saved_Regs_Size := Saved_Regs_Size * 8; else Saved_Regs_Size := Saved_Regs_Size * 4; end if; -- Compute frame size. -- Saved_Regs_Size must be added and substracted as the stack boundary -- can be larger than a reg size. Frame_Size := Unsigned_32 (Subprg.Stack_Max) + Saved_Regs_Size; -- Align. Frame_Size := (Frame_Size + X86.Flags.Stack_Boundary - 1) and not (X86.Flags.Stack_Boundary - 1); -- The bytes for saved regs are already allocated. Frame_Size := Frame_Size - Saved_Regs_Size; -- Emit prolog. -- push %ebp / push %rbp Push_Reg (R_Bp); -- movl %esp, %ebp / movl %rsp, %rbp Start_Insn; Gen_Rex (16#48#); Gen_8 (Opc_Mov_Rm_Reg + 1); Gen_8 (2#11_100_101#); End_Insn; -- Save int arguments (only on x86-64). Has_Fp_Inter := False; if Flags.M64 then declare Inter : O_Dnode; R : O_Reg; begin Inter := Get_Subprg_Interfaces (Subprg.D_Decl); while Inter /= O_Dnode_Null loop R := Get_Decl_Reg (Inter); if R in Regs_R64 then Push_Reg (R); -- Space for arguments was already counted in frame size. -- As the space is allocated by the push, don't allocate it -- later. Frame_Size := Frame_Size - 8; elsif R in Regs_Xmm then -- Need to save Xmm registers, but later. Has_Fp_Inter := True; else pragma Assert (R = R_None); null; end if; Inter := Get_Interface_Chain (Inter); end loop; end; end if; -- subl XXX, %esp / subl XXX, %rsp if Frame_Size /= 0 then if not X86.Flags.Flag_Alloca_Call or else Frame_Size <= 4096 then Gen_Sub_Sp (Int32 (Frame_Size)); else pragma Assert (not Flags.M64); -- mov stack_size,%eax Start_Insn; Gen_8 (Opc_Movl_Imm_Reg + To_Reg32 (R_Ax)); Gen_32 (Frame_Size); End_Insn; Gen_Call (Chkstk_Symbol); end if; end if; -- Save XMM arguments. if Flags.M64 and Has_Fp_Inter then declare Inter : O_Dnode; R : O_Reg; begin Inter := Get_Subprg_Interfaces (Subprg.D_Decl); while Inter /= O_Dnode_Null loop R := Get_Decl_Reg (Inter); if R in Regs_Xmm then Start_Insn; Gen_SSE_Prefix (Mode_F64); Init_Modrm_Offset (R_Bp, Get_Local_Offset (Inter), Sz_Fp, R); Gen_SSE_Opc (Opc_Movsd_M64_Xmm); Gen_Mod_Rm_Reg; End_Insn; -- No need to adjust frame_size, it was already allocated. end if; Inter := Get_Interface_Chain (Inter); end loop; end; end if; if Flag_Profile then Gen_Call (Mcount_Symbol); end if; -- Save preserved registers that are used in the function. for R in Preserved_Regs'Range loop if Preserved_Regs (R) and Reg_Used (R) then Push_Reg (R); end if; end loop; end Emit_Prologue; procedure Emit_Epilogue (Subprg : Subprogram_Data_Acc) is use Ortho_Code.Decls; use Ortho_Code.Types; use Ortho_Code.Flags; use Ortho_Code.X86.Insns; Decl : O_Dnode; Mode : Mode_Type; begin -- Restore registers. for R in reverse Preserved_Regs'Range loop if Preserved_Regs (R) and Reg_Used (R) then Pop_Reg (R); end if; end loop; Decl := Subprg.D_Decl; if Get_Decl_Kind (Decl) = OD_Function then Mode := Get_Type_Mode (Get_Decl_Type (Decl)); case Mode is when Mode_U8 | Mode_B2 => -- movzx %al,%eax Start_Insn; Gen_8 (Opc_0f); Gen_8 (Opc2_0f_Movzx); Gen_8 (2#11_000_000#); End_Insn; when Mode_U32 | Mode_I32 | Mode_U64 | Mode_I64 | Mode_P32 | Mode_P64 => null; when Mode_F32 | Mode_F64 => if Abi.Flag_Sse2 and not Flags.M64 then -- movsd %xmm0, slot(%ebp) Start_Insn; Gen_SSE_Prefix (Mode); Init_Modrm_Offset (R_Bp, -Int32 (Cur_Subprg.Target.Fp_Slot), Sz_32); Gen_SSE_Opc (Opc_Movsd_M64_Xmm); Gen_Mod_Rm_Opc (2#00_000_000#); End_Insn; -- fldl slot(%ebp) [keep same modrm parameters] Start_Insn; Gen_8 (2#11011_001# + Mode_Fp_To_Mf (Mode)); Gen_Mod_Rm_Opc (2#00_000_000#); End_Insn; end if; when others => raise Program_Error; end case; end if; -- leave; ret; Gen_1 (Opc_Leave); Gen_1 (Opc_Ret); if Flag_Debug /= Debug_None then Set_Body_Info (Subprg.D_Body, Int32 (Get_Current_Pc - Subprg_Pc)); end if; end Emit_Epilogue; procedure Emit_Subprg (Subprg : Subprogram_Data_Acc) is pragma Assert (Subprg = Cur_Subprg); Stmt : O_Enode; begin if Debug.Flag_Debug_Code2 then Abi.Disp_Subprg_Decl (Subprg.D_Decl); end if; Emit_Prologue (Subprg); Stmt := Subprg.E_Entry; loop Stmt := Get_Stmt_Link (Stmt); if Debug.Flag_Debug_Code2 then Abi.Disp_Stmt (Stmt); end if; Emit_Insn (Stmt); exit when Get_Expr_Kind (Stmt) = OE_Leave; end loop; Emit_Epilogue (Subprg); end Emit_Subprg; procedure Emit_Var_Decl (Decl : O_Dnode) is use Decls; Sym : Symbol; begin Sym := Create_Symbol (Get_Decl_Ident (Decl), False); Set_Decl_Info (Decl, To_Int32 (Uns32 (Sym))); end Emit_Var_Decl; procedure Emit_Var_Zero (Decl : O_Dnode) is use Decls; use Types; Sym : constant Symbol := Symbol (To_Uns32 (Get_Decl_Info (Decl))); Storage : constant O_Storage := Get_Decl_Storage (Decl); Dtype : constant O_Tnode := Get_Decl_Type (Decl); begin Set_Current_Section (Sect_Bss); pragma Assert (Storage = O_Storage_Public or Storage = O_Storage_Private); Gen_Pow_Align (Get_Type_Align (Dtype)); Set_Symbol_Pc (Sym, Storage = O_Storage_Public); Gen_Space (Integer_32 (Get_Type_Size (Dtype))); Set_Current_Section (Sect_Text); end Emit_Var_Zero; procedure Emit_Const_Decl (Decl : O_Dnode) is use Decls; Sym : Symbol; begin Set_Current_Section (Sect_Rodata); Sym := Create_Symbol (Get_Decl_Ident (Decl), False); Set_Decl_Info (Decl, To_Int32 (Uns32 (Sym))); Set_Current_Section (Sect_Text); end Emit_Const_Decl; procedure Emit_Const (Val : O_Cnode) is use Consts; use Types; H, L : Uns32; begin case Get_Const_Kind (Val) is when OC_Signed | OC_Unsigned | OC_Float | OC_Null | OC_Lit => Get_Const_Bytes (Val, H, L); case Get_Type_Mode (Get_Const_Type (Val)) is when Mode_U8 | Mode_I8 | Mode_B2 => Gen_8 (Byte (L)); when Mode_U32 | Mode_I32 | Mode_F32 | Mode_P32 => Gen_32 (Unsigned_32 (L)); when Mode_F64 | Mode_I64 | Mode_U64 | Mode_P64 => Gen_32 (Unsigned_32 (L)); Gen_32 (Unsigned_32 (H)); when others => raise Program_Error; end case; when OC_Address => declare Decl : O_Dnode; Off : Uns32; begin Get_Global_Decl_Offset (Get_Const_Global (Val), Decl, Off); Gen_Abs (Get_Decl_Symbol (Decl), Integer_32 (To_Int32 (Off))); end; when OC_Subprg_Address => Gen_Abs (Get_Decl_Symbol (Get_Const_Decl (Val)), 0); when OC_Array => for I in 0 .. Get_Const_Aggr_Length (Val) - 1 loop Emit_Const (Get_Const_Aggr_Element (Val, I)); end loop; when OC_Record => declare E : O_Cnode; begin for I in 0 .. Get_Const_Aggr_Length (Val) - 1 loop E := Get_Const_Aggr_Element (Val, I); Gen_Pow_Align (Get_Type_Align (Get_Const_Type (E))); Emit_Const (E); end loop; end; when OC_Zero => for I in 1 .. Get_Type_Size (Get_Const_Type (Val)) loop Gen_8 (0); end loop; when OC_Sizeof | OC_Alignof | OC_Union => raise Program_Error; end case; end Emit_Const; procedure Emit_Init_Value (Decl : O_Dnode; Val : O_Cnode) is use Decls; use Types; Sym : constant Symbol := Get_Decl_Symbol (Decl); Dtype : constant O_Tnode := Get_Decl_Type (Decl); begin case Get_Decl_Kind (Decl) is when OD_Const => Set_Current_Section (Sect_Rodata); when OD_Var => Set_Current_Section (Sect_Rodata); when others => raise Syntax_Error; end case; Gen_Pow_Align (Get_Type_Align (Dtype)); Set_Symbol_Pc (Sym, Get_Decl_Storage (Decl) = O_Storage_Public); Prealloc (Pc_Type (Get_Type_Size (Dtype))); Emit_Const (Val); Set_Current_Section (Sect_Text); end Emit_Init_Value; procedure Init is use Ortho_Ident; use Ortho_Code.Flags; begin if Flags.M64 then Arch := Arch_X86_64; else Arch := Arch_X86; end if; Create_Section (Sect_Text, ".text", Section_Exec + Section_Read); Create_Section (Sect_Rodata, ".rodata", Section_Read); Create_Section (Sect_Bss, ".bss", Section_Read + Section_Write + Section_Zero); Set_Current_Section (Sect_Text); if Flag_Profile then Mcount_Symbol := Create_Symbol (Get_Identifier ("mcount"), True); end if; if X86.Flags.Flag_Alloca_Call then Chkstk_Symbol := Create_Symbol (Get_Identifier ("___chkstk"), True); end if; if not Flags.M64 then Intrinsics_Symbol (Intrinsic_Mul_Ov_U64) := Create_Symbol (Get_Identifier ("__muldi3"), True); Intrinsics_Symbol (Intrinsic_Div_Ov_U64) := Create_Symbol (Get_Identifier ("__mcode_div_ov_u64"), True); Intrinsics_Symbol (Intrinsic_Mod_Ov_U64) := Create_Symbol (Get_Identifier ("__mcode_mod_ov_u64"), True); Intrinsics_Symbol (Intrinsic_Mul_Ov_I64) := Create_Symbol (Get_Identifier ("__muldi3"), True); Intrinsics_Symbol (Intrinsic_Div_Ov_I64) := Create_Symbol (Get_Identifier ("__divdi3"), True); Intrinsics_Symbol (Intrinsic_Mod_Ov_I64) := Create_Symbol (Get_Identifier ("__mcode_mod_ov_i64"), True); Intrinsics_Symbol (Intrinsic_Rem_Ov_I64) := Create_Symbol (Get_Identifier ("__mcode_rem_ov_i64"), True); end if; if Debug.Flag_Debug_Asm then Dump_Asm := True; end if; if Debug.Flag_Debug_Hex then Debug_Hex := True; end if; if Flag_Debug /= Debug_None then Dwarf.Init; Set_Current_Section (Sect_Text); end if; end Init; procedure Finish is use Ortho_Code.Flags; begin if Flag_Debug /= Debug_None then Set_Current_Section (Sect_Text); Dwarf.Finish; end if; end Finish; end Ortho_Code.X86.Emits;