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|
-- Binary file handling.
-- 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 System.Storage_Elements;
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Characters.Latin_1;
with Hex_Images; use Hex_Images;
with Disassemble;
package body Binary_File is
Cur_Sect : Section_Acc := null;
HT : Character renames Ada.Characters.Latin_1.HT;
-- Resize a section to SIZE bytes.
procedure Resize (Sect : Section_Acc; Size : Pc_Type) is
begin
Sect.Data_Max := Size;
Memsegs.Resize (Sect.Seg, Natural (Size));
Sect.Data := To_Byte_Array_Acc (Memsegs.Get_Address (Sect.Seg));
end Resize;
function Get_Scope (Sym : Symbol) return Symbol_Scope is
begin
return Symbols.Table (Sym).Scope;
end Get_Scope;
procedure Set_Scope (Sym : Symbol; Scope : Symbol_Scope) is
begin
Symbols.Table (Sym).Scope := Scope;
end Set_Scope;
function Get_Section (Sym : Symbol) return Section_Acc is
begin
return Symbols.Table (Sym).Section;
end Get_Section;
procedure Set_Section (Sym : Symbol; Sect : Section_Acc) is
begin
Symbols.Table (Sym).Section := Sect;
end Set_Section;
function Get_Number (Sym : Symbol) return Natural is
begin
return Symbols.Table (Sym).Number;
end Get_Number;
procedure Set_Number (Sym : Symbol; Num : Natural) is
begin
Symbols.Table (Sym).Number := Num;
end Set_Number;
function Get_Relocs (Sym : Symbol) return Reloc_Acc is
begin
return Symbols.Table (Sym).Relocs;
end Get_Relocs;
procedure Set_Relocs (Sym : Symbol; Reloc : Reloc_Acc) is
begin
Symbols.Table (Sym).Relocs := Reloc;
end Set_Relocs;
function Get_Name (Sym : Symbol) return O_Ident is
begin
return Symbols.Table (Sym).Name;
end Get_Name;
function Get_Used (Sym : Symbol) return Boolean is
begin
return Symbols.Table (Sym).Used;
end Get_Used;
procedure Set_Used (Sym : Symbol; Val : Boolean) is
begin
Symbols.Table (Sym).Used := Val;
end Set_Used;
function Get_Symbol_Value (Sym : Symbol) return Pc_Type is
begin
return Symbols.Table (Sym).Value;
end Get_Symbol_Value;
procedure Set_Symbol_Value (Sym : Symbol; Val : Pc_Type) is
begin
Symbols.Table (Sym).Value := Val;
end Set_Symbol_Value;
function S_Defined (Sym : Symbol) return Boolean is
begin
return Get_Scope (Sym) /= Sym_Undef;
end S_Defined;
pragma Unreferenced (S_Defined);
function S_Local (Sym : Symbol) return Boolean is
begin
return Get_Scope (Sym) = Sym_Local;
end S_Local;
function Is_Symbol_Code (Sym : Symbol) return Boolean is
begin
return Symbols.Table (Sym).Code;
end Is_Symbol_Code;
procedure Create_Section (Sect : out Section_Acc;
Name : String; Flags : Section_Flags)
is
begin
Sect := new Section_Type'(Next => null,
Flags => Flags,
Name => new String'(Name),
Link => null,
Align => 2,
Esize => 0,
Pc => 0,
Insn_Pc => 0,
Data => null,
Data_Max => 0,
First_Reloc => null,
Last_Reloc => null,
Nbr_Relocs => 0,
Number => 0,
Seg => Memsegs.Create,
Vaddr => 0);
if (Flags and Section_Zero) = 0 then
-- Allocate memory for the segment, unless BSS.
Resize (Sect, 8192);
end if;
if (Flags and Section_Strtab) /= 0 then
Sect.Align := 0;
end if;
if Section_Chain = null then
Section_Chain := Sect;
else
Section_Last.Next := Sect;
end if;
Section_Last := Sect;
Nbr_Sections := Nbr_Sections + 1;
end Create_Section;
procedure Sect_Prealloc (Sect : Section_Acc; L : Pc_Type)
is
New_Max : Pc_Type;
begin
if Sect.Pc + L < Sect.Data_Max then
return;
end if;
New_Max := Sect.Data_Max;
loop
New_Max := New_Max * 2;
exit when Sect.Pc + L < New_Max;
end loop;
Resize (Sect, New_Max);
end Sect_Prealloc;
procedure Merge_Section (Dest : Section_Acc; Src : Section_Acc)
is
Rel : Reloc_Acc;
begin
-- Sanity checks.
if Src = null or else Dest = Src then
raise Program_Error;
end if;
Rel := Src.First_Reloc;
if Rel /= null then
-- Move internal relocs.
-- Note: external relocs are not modified, so they can still refer
-- to this SRC section.
if Dest.Last_Reloc = null then
Dest.First_Reloc := Rel;
Dest.Last_Reloc := Rel;
else
Dest.Last_Reloc.Sect_Next := Rel;
Dest.Last_Reloc := Rel;
end if;
Dest.Nbr_Relocs := Dest.Nbr_Relocs + Src.Nbr_Relocs;
-- Reloc reloc, since the pc has changed.
while Rel /= null loop
Rel.Addr := Rel.Addr + Dest.Pc;
Rel := Rel.Sect_Next;
end loop;
end if;
if Src.Pc > 0 then
-- Alignment is assumed to be compatible...
Sect_Prealloc (Dest, Src.Pc);
Dest.Data (Dest.Pc .. Dest.Pc + Src.Pc - 1) :=
Src.Data (0 .. Src.Pc - 1);
Dest.Pc := Dest.Pc + Src.Pc;
end if;
Memsegs.Delete (Src.Seg);
Src.Pc := 0;
Src.Data_Max := 0;
Src.Data := null;
Src.First_Reloc := null;
Src.Last_Reloc := null;
Src.Nbr_Relocs := 0;
-- Remove from section_chain.
if Section_Chain = Src then
Section_Chain := Src.Next;
else
declare
Sect : Section_Acc;
begin
Sect := Section_Chain;
while Sect.Next /= Src loop
Sect := Sect.Next;
end loop;
Sect.Next := Src.Next;
if Section_Last = Src then
Section_Last := Sect;
end if;
end;
end if;
Nbr_Sections := Nbr_Sections - 1;
end Merge_Section;
procedure Set_Section_Info (Sect : Section_Acc;
Link : Section_Acc;
Align : Natural;
Esize : Natural)
is
begin
Sect.Link := Link;
Sect.Align := Align;
Sect.Esize := Esize;
end Set_Section_Info;
procedure Set_Current_Section (Sect : Section_Acc) is
begin
-- If the current section does not change, this is a no-op.
if Cur_Sect = Sect then
return;
end if;
if Dump_Asm then
Put_Line (HT & ".section """ & Sect.Name.all & """");
end if;
Cur_Sect := Sect;
end Set_Current_Section;
function Get_Current_Pc return Pc_Type is
begin
return Cur_Sect.Pc;
end Get_Current_Pc;
function Get_Pc (Sect : Section_Acc) return Pc_Type is
begin
return Sect.Pc;
end Get_Pc;
procedure Prealloc (L : Pc_Type) is
begin
Sect_Prealloc (Cur_Sect, L);
end Prealloc;
-- Reloc to be adjusted at end_insn.
Pcrel_Reloc : Reloc_Acc := null;
procedure Start_Insn is
begin
-- Check there is enough memory for the next instruction.
Sect_Prealloc (Cur_Sect, 16);
if Cur_Sect.Insn_Pc /= 0 then
-- end_insn was not called.
raise Program_Error;
end if;
Cur_Sect.Insn_Pc := Cur_Sect.Pc;
end Start_Insn;
procedure Get_Symbol_At_Addr (Addr : System.Address;
Line : in out String;
Line_Len : in out Natural)
is
use System;
use System.Storage_Elements;
Off : Pc_Type;
Reloc : Reloc_Acc;
begin
-- Check if addr is in the current section.
if Addr < Cur_Sect.Data (0)'Address
or else Addr > Cur_Sect.Data (Cur_Sect.Pc)'Address
then
raise Program_Error;
--return;
end if;
Off := Pc_Type
(To_Integer (Addr) - To_Integer (Cur_Sect.Data (0)'Address));
-- Find a relocation at OFF.
Reloc := Cur_Sect.First_Reloc;
while Reloc /= null loop
if Reloc.Addr = Off then
declare
Str : constant String := Get_Symbol_Name (Reloc.Sym);
begin
Line (Line'First .. Line'First + Str'Length - 1) := Str;
Line_Len := Line_Len + Str'Length;
return;
end;
end if;
Reloc := Reloc.Sect_Next;
end loop;
end Get_Symbol_At_Addr;
procedure End_Insn
is
Str : String (1 .. 256);
Len : Natural;
Insn_Len : Natural;
begin
if Pcrel_Reloc /= null then
Pcrel_Reloc.Neg_Addend := Cur_Sect.Pc - Pcrel_Reloc.Addr;
Pcrel_Reloc := null;
end if;
--if Insn_Pc = 0 then
-- -- start_insn was not called.
-- raise Program_Error;
--end if;
if Debug_Hex then
Put (HT);
Put ('#');
for I in Cur_Sect.Insn_Pc .. Cur_Sect.Pc - 1 loop
Put (' ');
Put (Hex_Image (Unsigned_8 (Cur_Sect.Data (I))));
end loop;
New_Line;
end if;
if Dump_Asm then
Disassemble.Disassemble_Insn
(Cur_Sect.Data (Cur_Sect.Insn_Pc)'Address,
Unsigned_32 (Cur_Sect.Insn_Pc),
Str, Len, Insn_Len,
Get_Symbol_At_Addr'Access);
Put (HT);
Put_Line (Str (1 .. Len));
end if;
--if Natural (Cur_Pc - Insn_Pc) /= Insn_Len then
-- raise Program_Error;
--end if;
Cur_Sect.Insn_Pc := 0;
end End_Insn;
procedure Gen_8 (B : Byte) is
begin
Cur_Sect.Data (Cur_Sect.Pc) := B;
Cur_Sect.Pc := Cur_Sect.Pc + 1;
end Gen_8;
procedure Gen_8 (B0, B1 : Byte) is
begin
Cur_Sect.Data (Cur_Sect.Pc + 0) := B0;
Cur_Sect.Data (Cur_Sect.Pc + 1) := B1;
Cur_Sect.Pc := Cur_Sect.Pc + 2;
end Gen_8;
procedure Write_8 (Sect : Section_Acc; Pc : Pc_Type; V : Unsigned_8) is
begin
Sect.Data (Pc) := Byte (V);
end Write_8;
procedure Write_16 (Sect : Section_Acc; Pc : Pc_Type; B : Unsigned_32)
is
subtype B2 is Byte_Array_Base (0 .. 1);
function To_B2 is new Ada.Unchecked_Conversion
(Source => Unsigned_16, Target => B2);
begin
Sect.Data (Pc + 0 .. Pc + 1) := To_B2 (Unsigned_16 (B));
end Write_16;
procedure Write_32 (Sect : Section_Acc; Pc : Pc_Type; B : Unsigned_32)
is
subtype B4 is Byte_Array_Base (0 .. 3);
function To_B4 is new Ada.Unchecked_Conversion
(Source => Unsigned_32, Target => B4);
begin
Sect.Data (Pc + 0 .. Pc + 3) := To_B4 (B);
end Write_32;
procedure Write_64 (Sect : Section_Acc; Pc : Pc_Type; B : Unsigned_64)
is
subtype B8 is Byte_Array_Base (0 .. 7);
function To_B8 is new Ada.Unchecked_Conversion
(Source => Unsigned_64, Target => B8);
begin
Sect.Data (Pc + 0 .. Pc + 7) := To_B8 (B);
end Write_64;
procedure Write_Addr (Sect : Section_Acc; Pc : Pc_Type; B : Pc_Type)
is
subtype BPC is Byte_Array_Base (0 .. Pc_Type_Sizeof - 1);
function To_BPC is new Ada.Unchecked_Conversion
(Source => Pc_Type, Target => BPC);
begin
Sect.Data (Pc + 0 .. Pc + Pc_Type_Sizeof - 1) := To_BPC (B);
end Write_Addr;
procedure Gen_16 (B : Unsigned_32) is
begin
Write_16 (Cur_Sect, Cur_Sect.Pc, B);
Cur_Sect.Pc := Cur_Sect.Pc + 2;
end Gen_16;
procedure Gen_32 (B : Unsigned_32) is
begin
Write_32 (Cur_Sect, Cur_Sect.Pc, B);
Cur_Sect.Pc := Cur_Sect.Pc + 4;
end Gen_32;
function Read_32 (Sect : Section_Acc; Pc : Pc_Type) return Unsigned_32
is
subtype B4 is Byte_Array_Base (0 .. 3);
function From_B4 is new Ada.Unchecked_Conversion
(Source => B4, Target => Unsigned_32);
begin
return From_B4 (Sect.Data (Pc + 0 .. Pc + 3));
end Read_32;
function Read_Addr (Sect : Section_Acc; Pc : Pc_Type) return Pc_Type
is
subtype BPC is Byte_Array_Base (0 .. Pc_Type_Sizeof - 1);
function From_BPC is new Ada.Unchecked_Conversion
(Source => BPC, Target => Pc_Type);
begin
return From_BPC (Sect.Data (Pc + 0 .. Pc + Pc_Type_Sizeof - 1));
end Read_Addr;
procedure Add_32 (Sect : Section_Acc; Pc : Pc_Type; V : Unsigned_32) is
begin
Write_32 (Sect, Pc, V + Read_32 (Sect, Pc));
end Add_32;
procedure Add_Addr (Sect : Section_Acc; Pc : Pc_Type; V : Pc_Type) is
begin
Write_Addr (Sect, Pc, V + Read_Addr (Sect, Pc));
end Add_Addr;
procedure Patch_32 (Pc : Pc_Type; V : Unsigned_32) is
begin
pragma Assert (Pc + 4 <= Get_Current_Pc);
Write_32 (Cur_Sect, Pc, V);
end Patch_32;
procedure Patch_16 (Pc : Pc_Type; V : Unsigned_32) is
begin
pragma Assert (Pc + 2 <= Get_Current_Pc);
Write_16 (Cur_Sect, Pc, V);
end Patch_16;
procedure Patch_8 (Pc : Pc_Type; V : Unsigned_8) is
begin
pragma Assert (Pc + 1 <= Get_Current_Pc);
Write_8 (Cur_Sect, Pc, V);
end Patch_8;
procedure Gen_64 (B : Unsigned_64) is
begin
Write_64 (Cur_Sect, Cur_Sect.Pc, B);
Cur_Sect.Pc := Cur_Sect.Pc + 8;
end Gen_64;
procedure Gen_Data_8 (B : Unsigned_8) is
begin
if Dump_Asm then
Put_Line (HT & ".byte 0x" & Hex_Image (B));
end if;
Gen_8 (Byte (B));
end Gen_Data_8;
procedure Gen_Data_16 (B : Unsigned_32) is
begin
if Dump_Asm then
Put_Line (HT & ".half 0x" & Hex_Image (Unsigned_16 (B)));
end if;
Gen_16 (B);
end Gen_Data_16;
procedure Gen_Data_32 (Sym : Symbol; Offset : Integer_32) is
begin
if Dump_Asm then
if Sym = Null_Symbol then
Put_Line (HT & ".word 0x" & Hex_Image (Offset));
else
if Offset = 0 then
Put_Line (HT & ".word " & Get_Symbol_Name (Sym));
else
Put_Line (HT & ".word " & Get_Symbol_Name (Sym) & " + "
& Hex_Image (Offset));
end if;
end if;
end if;
case Arch is
when Arch_X86 =>
Gen_X86_32 (Sym, Offset);
when Arch_Sparc =>
Gen_Sparc_32 (Sym, Offset);
when others =>
raise Program_Error;
end case;
end Gen_Data_32;
function To_Unsigned_32 (Off : Pc_Type) return Unsigned_32 is
begin
-- if Off >= 16#8000_0000# and Off < 16#ffff_ffff_8000_0000# then
-- raise Constraint_Error;
-- end if;
return Unsigned_32 (Off and 16#ffff_ffff#);
end To_Unsigned_32;
function Create_Symbol (Name : O_Ident; Code : Boolean) return Symbol
is
begin
Symbols.Append (Symbol_Type'(Section => null,
Value => 0,
Scope => Sym_Undef,
Used => False,
Code => Code,
Name => Name,
Relocs => null,
Number => 0));
return Symbols.Last;
end Create_Symbol;
Last_Label : Natural := 1;
function Create_Local_Symbol return Symbol is
begin
Symbols.Append (Symbol_Type'(Section => Cur_Sect,
Value => 0,
Scope => Sym_Local,
Used => False,
Code => False, -- Don't care.
Name => O_Ident_Nul,
Relocs => null,
Number => Last_Label));
Last_Label := Last_Label + 1;
return Symbols.Last;
end Create_Local_Symbol;
function Get_Symbol_Name (Sym : Symbol) return String
is
Res : String (1 .. 10);
N : Natural;
P : Natural;
begin
if S_Local (Sym) then
N := Get_Number (Sym);
P := Res'Last;
loop
Res (P) := Character'Val ((N mod 10) + Character'Pos ('0'));
N := N / 10;
P := P - 1;
exit when N = 0;
end loop;
Res (P) := 'L';
Res (P - 1) := '.';
return Res (P - 1 .. Res'Last);
else
if Is_Nul (Get_Name (Sym)) then
return "ANON";
else
return Get_String (Get_Name (Sym));
end if;
end if;
end Get_Symbol_Name;
function Get_Symbol_Name_Length (Sym : Symbol) return Natural
is
N : Natural;
begin
if S_Local (Sym) then
N := 10;
for I in 1 .. 8 loop
if Get_Number (Sym) < N then
return I + 2;
end if;
N := N * 10;
end loop;
raise Program_Error;
else
return Get_String_Length (Get_Name (Sym));
end if;
end Get_Symbol_Name_Length;
function Get_Symbol (Name : String) return Symbol is
begin
for I in Symbols.First .. Symbols.Last loop
if Get_Symbol_Name (I) = Name then
return I;
end if;
end loop;
return Null_Symbol;
end Get_Symbol;
function Pow_Align (V : Pc_Type; Align : Natural) return Pc_Type
is
Mask : constant Pc_Type := (2 ** Align) - 1;
begin
return (V + Mask) and not Mask;
end Pow_Align;
procedure Gen_Pow_Align (Align : Natural) is
begin
if Align = 0 then
return;
end if;
if Dump_Asm then
Put_Line (HT & ".align" & Natural'Image (Align));
end if;
Cur_Sect.Pc := Pow_Align (Cur_Sect.Pc, Align);
end Gen_Pow_Align;
-- Generate LENGTH bytes set to 0.
procedure Gen_Space (Length : Integer_32) is
begin
if Dump_Asm then
Put_Line (HT & ".space" & Integer_32'Image (Length));
end if;
Cur_Sect.Pc := Cur_Sect.Pc + Pc_Type (Length);
end Gen_Space;
procedure Set_Symbol_Pc (Sym : Symbol; Export : Boolean) is
begin
case Get_Scope (Sym) is
when Sym_Local =>
if Export then
raise Program_Error;
end if;
when Sym_Private
| Sym_Global =>
raise Program_Error;
when Sym_Undef =>
if Export then
Set_Scope (Sym, Sym_Global);
else
Set_Scope (Sym, Sym_Private);
end if;
end case;
-- Set value/section.
Set_Symbol_Value (Sym, Cur_Sect.Pc);
Set_Section (Sym, Cur_Sect);
if Dump_Asm then
if Export then
Put_Line (HT & ".globl " & Get_Symbol_Name (Sym));
end if;
Put (Get_Symbol_Name (Sym));
Put_Line (":");
end if;
end Set_Symbol_Pc;
function Add_Reloc (Sym : Symbol; Kind : Reloc_Kind) return Reloc_Acc
is
Reloc : Reloc_Acc;
begin
Reloc := new Reloc_Type'(Kind => Kind,
Done => False,
Neg_Addend => 0,
Sym_Next => Get_Relocs (Sym),
Sect_Next => null,
Addr => Cur_Sect.Pc,
Sym => Sym);
-- Add reloc to the relocations list of SYM.
Set_Relocs (Sym, Reloc);
-- Add reloc to the relocations list of CUR_SECT.
if Cur_Sect.First_Reloc = null then
Cur_Sect.First_Reloc := Reloc;
else
Cur_Sect.Last_Reloc.Sect_Next := Reloc;
end if;
Cur_Sect.Last_Reloc := Reloc;
Cur_Sect.Nbr_Relocs := Cur_Sect.Nbr_Relocs + 1;
return Reloc;
end Add_Reloc;
procedure Add_Reloc (Sym : Symbol; Kind : Reloc_Kind)
is
Res : Reloc_Acc;
pragma Unreferenced (Res);
begin
Res := Add_Reloc (Sym, Kind);
end Add_Reloc;
function Conv is new Ada.Unchecked_Conversion
(Source => Integer_32, Target => Unsigned_32);
procedure Gen_X86_Pc32 (Sym : Symbol; Off : Unsigned_32) is
begin
-- On X86, displacements (EIP/RIP relative offsets) are relative to the
-- PC of the following instruction. For jmp or jcc, the instruction
-- ends just after the disp32, but for x86-64 RIP relative addressing,
-- the length of the instruction is not known. So this relocation will
-- be adjusted at the end of the instruction.
-- Handle only one PCrel relocation per instruction.
pragma Assert (Pcrel_Reloc = null);
Pcrel_Reloc := Add_Reloc (Sym, Reloc_Pc32);
Gen_32 (Off);
end Gen_X86_Pc32;
procedure Gen_Sparc_Disp22 (W : Unsigned_32; Sym : Symbol)
is
begin
Add_Reloc (Sym, Reloc_Disp22);
Gen_32 (W);
end Gen_Sparc_Disp22;
procedure Gen_Sparc_Disp30 (W : Unsigned_32; Sym : Symbol)
is
begin
Add_Reloc (Sym, Reloc_Disp30);
Gen_32 (W);
end Gen_Sparc_Disp30;
procedure Gen_Sparc_Hi22 (W : Unsigned_32;
Sym : Symbol; Off : Unsigned_32)
is
pragma Unreferenced (Off);
begin
Add_Reloc (Sym, Reloc_Hi22);
Gen_32 (W);
end Gen_Sparc_Hi22;
procedure Gen_Sparc_Lo10 (W : Unsigned_32;
Sym : Symbol; Off : Unsigned_32)
is
pragma Unreferenced (Off);
begin
Add_Reloc (Sym, Reloc_Lo10);
Gen_32 (W);
end Gen_Sparc_Lo10;
procedure Gen_Addr (Offset : Integer_32) is
begin
pragma Warnings (Off); -- Avoid warning on constant condition.
if Pc_Type'Size = 32 then
Gen_32 (Conv (Offset));
elsif Pc_Type'Size = 64 then
Gen_64 (Unsigned_64 (Conv (Offset)));
else
raise Program_Error;
end if;
pragma Warnings (On);
end Gen_Addr;
procedure Gen_Abs (Sym : Symbol; Offset : Integer_32) is
begin
if Sym /= Null_Symbol then
Add_Reloc (Sym, Reloc_Abs);
end if;
Gen_Addr (Offset);
end Gen_Abs;
procedure Gen_X86_32 (Sym : Symbol; Offset : Integer_32) is
begin
pragma Assert (Arch = Arch_X86);
if Sym /= Null_Symbol then
Add_Reloc (Sym, Reloc_32);
end if;
Gen_32 (Conv (Offset));
end Gen_X86_32;
procedure Gen_Sparc_32 (Sym : Symbol; Offset : Integer_32) is
begin
if Sym /= Null_Symbol then
Add_Reloc (Sym, Reloc_32);
end if;
Gen_32 (Conv (Offset));
end Gen_Sparc_32;
procedure Gen_Ua_32 (Sym : Symbol) is
begin
if Sym /= Null_Symbol then
Add_Reloc (Sym, Reloc_Ua_32);
end if;
Gen_32 (0);
end Gen_Ua_32;
procedure Gen_Ua_Addr (Sym : Symbol; Offset : Integer_32) is
begin
if Sym /= Null_Symbol then
Add_Reloc (Sym, Reloc_Ua_Addr);
end if;
Gen_Addr (Offset);
end Gen_Ua_Addr;
procedure Gen_Ppc_24 (V : Unsigned_32; Sym : Symbol)
is
begin
Add_Reloc (Sym, Reloc_Ppc_Addr24);
Gen_32 (V);
end Gen_Ppc_24;
function Get_Symbol_Vaddr (Sym : Symbol) return Pc_Type is
begin
return Get_Section (Sym).Vaddr + Get_Symbol_Value (Sym);
end Get_Symbol_Vaddr;
procedure Write_Left_32 (Sect : Section_Acc;
Addr : Pc_Type;
Size : Natural;
Val : Unsigned_32)
is
W : Unsigned_32;
Mask : Unsigned_32;
begin
-- Write value.
Mask := Shift_Left (1, Size) - 1;
W := Read_32 (Sect, Addr);
Write_32 (Sect, Addr, (W and not Mask) or (Val and Mask));
end Write_Left_32;
procedure Set_Wdisp (Sect : Section_Acc;
Addr : Pc_Type;
Sym : Symbol;
Size : Natural)
is
D : Unsigned_32;
Mask : Unsigned_32;
begin
D := Unsigned_32 (Get_Symbol_Vaddr (Sym) - (Sect.Vaddr + Addr));
-- Check overflow.
Mask := Shift_Left (1, Size + 2) - 1;
if (D and Shift_Left (1, Size + 1)) = 0 then
if (D and not Mask) /= 0 then
raise Program_Error;
end if;
else
if (D and not Mask) /= not Mask then
raise Program_Error;
end if;
end if;
-- Write value.
Write_Left_32 (Sect, Addr, Size, D / 4);
end Set_Wdisp;
procedure Apply_Reloc (Sect : Section_Acc; Reloc : Reloc_Acc)
is
Addr : constant Pc_Type := Reloc.Addr;
Sym : constant Symbol := Reloc.Sym;
begin
pragma Assert (Get_Scope (Sym) /= Sym_Undef);
case Reloc.Kind is
when Reloc_32 =>
Add_32 (Sect, Addr, Unsigned_32 (Get_Symbol_Vaddr (Sym)));
when Reloc_Abs
| Reloc_Ua_Addr =>
Add_Addr (Sect, Addr, Get_Symbol_Vaddr (Sym));
when Reloc_Pc32 =>
Add_32 (Sect, Addr,
To_Unsigned_32 (Get_Symbol_Vaddr (Sym)
- (Sect.Vaddr + Addr)
- Reloc.Neg_Addend));
when Reloc_Disp22 =>
Set_Wdisp (Sect, Addr, Sym, 22);
when Reloc_Disp30 =>
Set_Wdisp (Sect, Addr, Sym, 30);
when Reloc_Hi22 =>
Write_Left_32 (Sect, Addr, 22,
Unsigned_32 (Get_Symbol_Vaddr (Sym) / 1024));
when Reloc_Lo10 =>
Write_Left_32 (Sect, Addr, 10,
Unsigned_32 (Get_Symbol_Vaddr (Sym)));
when Reloc_Ua_32 =>
Write_32 (Sect, Addr, Unsigned_32 (Get_Symbol_Vaddr (Sym)));
when Reloc_Ppc_Addr24 =>
raise Program_Error;
end case;
end Apply_Reloc;
function Is_Reloc_Relative (Reloc : Reloc_Acc) return Boolean is
begin
case Reloc.Kind is
when Reloc_Pc32
| Reloc_Disp22
| Reloc_Disp30 =>
return True;
when others =>
return False;
end case;
end Is_Reloc_Relative;
procedure Do_Intra_Section_Reloc (Sect : Section_Acc)
is
Prev : Reloc_Acc;
Rel : Reloc_Acc;
Next : Reloc_Acc;
begin
Rel := Sect.First_Reloc;
Prev := null;
while Rel /= null loop
Next := Rel.Sect_Next;
if Get_Scope (Rel.Sym) /= Sym_Undef then
Apply_Reloc (Sect, Rel);
Rel.Done := True;
if Get_Section (Rel.Sym) = Sect
and then Is_Reloc_Relative (Rel)
then
-- Remove reloc.
Sect.Nbr_Relocs := Sect.Nbr_Relocs - 1;
if Prev = null then
Sect.First_Reloc := Next;
else
Prev.Sect_Next := Next;
end if;
if Next = null then
Sect.Last_Reloc := Prev;
end if;
Free (Rel);
else
Prev := Rel;
end if;
else
Set_Used (Rel.Sym, True);
Prev := Rel;
end if;
Rel := Next;
end loop;
end Do_Intra_Section_Reloc;
-- Return VAL rounded up to 2 ^ POW.
-- function Align_Pow (Val : Integer; Pow : Natural) return Integer
-- is
-- N : Integer;
-- Tmp : Integer;
-- begin
-- N := 2 ** Pow;
-- Tmp := Val + N - 1;
-- return Tmp - (Tmp mod N);
-- end Align_Pow;
procedure Disp_Stats is
begin
Put_Line ("Number of Symbols: " & Symbol'Image (Symbols.Last));
end Disp_Stats;
procedure Finish
is
Sect : Section_Acc;
Rel, N_Rel : Reloc_Acc;
begin
Symbols.Free;
Sect := Section_Chain;
while Sect /= null loop
-- Free relocs.
Rel := Sect.First_Reloc;
while Rel /= null loop
N_Rel := Rel.Sect_Next;
Free (Rel);
Rel := N_Rel;
end loop;
Sect.First_Reloc := null;
Sect.Last_Reloc := null;
Sect := Sect.Next;
end loop;
end Finish;
end Binary_File;
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