with System.Memory;
with System.Aux_DEC; use System.Aux_DEC;
with Unchecked_Conversion;
package body System.Machine_State_Operations is
use System.Exceptions;
subtype Cond_Value_Type is Unsigned_Longword;
type ICB_Fflags_Bits_Type is record
Exception_Frame : Boolean;
Ast_Frame : Boolean;
Bottom_Of_Stack : Boolean;
Base_Frame : Boolean;
Filler_1 : Unsigned_20;
end record;
for ICB_Fflags_Bits_Type use record
Exception_Frame at 0 range 0 .. 0;
Ast_Frame at 0 range 1 .. 1;
Bottom_Of_Stack at 0 range 2 .. 2;
Base_Frame at 0 range 3 .. 3;
Filler_1 at 0 range 4 .. 23;
end record;
for ICB_Fflags_Bits_Type'Size use 24;
ICB_Fflags_Bits_Type_Init : constant ICB_Fflags_Bits_Type :=
(ExceptIon_Frame => False,
Ast_Frame => False,
Bottom_Of_STACK => False,
Base_Frame => False,
Filler_1 => 0);
type ICB_Hdr_Quad_Type is record
Context_Length : Unsigned_Longword;
Fflags_Bits : ICB_Fflags_Bits_Type;
Block_Version : Unsigned_Byte;
end record;
for ICB_Hdr_Quad_Type use record
Context_Length at 0 range 0 .. 31;
Fflags_Bits at 4 range 0 .. 23;
Block_Version at 7 range 0 .. 7;
end record;
for ICB_Hdr_Quad_Type'Size use 64;
ICB_Hdr_Quad_Type_Init : constant ICB_Hdr_Quad_Type :=
(Context_Length => 0,
Fflags_Bits => ICB_Fflags_Bits_Type_Init,
Block_Version => 0);
type Invo_Context_Blk_Type is record
Hdr_Quad : ICB_Hdr_Quad_Type;
Procedure_Descriptor : Unsigned_Quadword;
Program_Counter : Integer_64;
Processor_Status : Integer_64;
Ireg : Unsigned_Quadword_Array (0 .. 30);
Freg : Unsigned_Quadword_Array (0 .. 30);
System_Defined : Unsigned_Quadword_Array (0 .. 1);
Filler_1 : String (1 .. 0);
end record;
for Invo_Context_Blk_Type use record
Hdr_Quad at 0 range 0 .. 63;
Procedure_Descriptor at 8 range 0 .. 63;
Program_Counter at 16 range 0 .. 63;
Processor_Status at 24 range 0 .. 63;
Ireg at 32 range 0 .. 1983;
Freg at 280 range 0 .. 1983;
System_Defined at 528 range 0 .. 127;
Filler_1 at 544 range 0 .. -1;
end record;
for Invo_Context_Blk_Type'Size use 4352;
Invo_Context_Blk_Type_Init : constant Invo_Context_Blk_Type :=
(Hdr_Quad => ICB_Hdr_Quad_Type_Init,
Procedure_Descriptor => (0, 0),
Program_Counter => 0,
Processor_Status => 0,
Ireg => (others => (0, 0)),
Freg => (others => (0, 0)),
System_Defined => (others => (0, 0)),
Filler_1 => (others => ASCII.NUL));
subtype Invo_Handle_Type is Unsigned_Longword;
type Invo_Handle_Access_Type is access all Invo_Handle_Type;
function Fetch is new Fetch_From_Address (Code_Loc);
function To_Invo_Handle_Access is new Unchecked_Conversion
(Machine_State, Invo_Handle_Access_Type);
function To_Machine_State is new Unchecked_Conversion
(System.Address, Machine_State);
function To_Code_Loc is new Unchecked_Conversion
(Unsigned_Longword, Code_Loc);
function Allocate_Machine_State return Machine_State is
begin
return To_Machine_State
(Memory.Alloc (Invo_Handle_Type'Max_Size_In_Storage_Elements));
end Allocate_Machine_State;
procedure Enter_Handler (M : Machine_State; Handler : Handler_Loc) is
procedure Get_Invo_Context (
Result : out Unsigned_Longword; Invo_Handle : in Invo_Handle_Type;
Invo_Context : out Invo_Context_Blk_Type);
pragma Interface (External, Get_Invo_Context);
pragma Import_Valued_Procedure (Get_Invo_Context, "LIB$GET_INVO_CONTEXT",
(Unsigned_Longword, Invo_Handle_Type, Invo_Context_Blk_Type),
(Value, Value, Reference));
ICB : Invo_Context_Blk_Type;
procedure Goto_Unwind (
Status : out Cond_Value_Type; Target_Invo : in Address := Address_Zero;
Target_PC : in Address := Address_Zero;
New_R0 : in Unsigned_Quadword
:= Unsigned_Quadword'Null_Parameter;
New_R1 : in Unsigned_Quadword
:= Unsigned_Quadword'Null_Parameter);
pragma Interface (External, Goto_Unwind);
pragma Import_Valued_Procedure
(Goto_Unwind, "SYS$GOTO_UNWIND",
(Cond_Value_Type, Address, Address,
Unsigned_Quadword, Unsigned_Quadword),
(Value, Reference, Reference,
Reference, Reference));
Status : Cond_Value_Type;
begin
Get_Invo_Context (Status, To_Invo_Handle_Access (M).all, ICB);
Goto_Unwind
(Status, System.Address (To_Invo_Handle_Access (M).all), Handler);
end Enter_Handler;
function Fetch_Code (Loc : Code_Loc) return Code_Loc is
begin
return Fetch (System.Aux_DEC."+" (Loc, 8));
end Fetch_Code;
procedure Free_Machine_State (M : in out Machine_State) is
procedure Gnat_Free (M : in Invo_Handle_Access_Type);
pragma Import (C, Gnat_Free, "__gnat_free");
begin
Gnat_Free (To_Invo_Handle_Access (M));
M := Machine_State (Null_Address);
end Free_Machine_State;
function Get_Code_Loc (M : Machine_State) return Code_Loc is
procedure Get_Invo_Context (
Result : out Unsigned_Longword; Invo_Handle : in Invo_Handle_Type;
Invo_Context : out Invo_Context_Blk_Type);
pragma Interface (External, Get_Invo_Context);
pragma Import_Valued_Procedure (Get_Invo_Context, "LIB$GET_INVO_CONTEXT",
(Unsigned_Longword, Invo_Handle_Type, Invo_Context_Blk_Type),
(Value, Value, Reference));
Asm_Call_Size : constant := 4;
ICB : Invo_Context_Blk_Type;
Status : Cond_Value_Type;
begin
Get_Invo_Context (Status, To_Invo_Handle_Access (M).all, ICB);
if (Status and 1) /= 1 then
return Code_Loc (System.Null_Address);
end if;
return Code_Loc (ICB.Program_Counter - Asm_Call_Size);
end Get_Code_Loc;
function Machine_State_Length
return System.Storage_Elements.Storage_Offset
is
use System.Storage_Elements;
begin
return Invo_Handle_Type'Size / 8;
end Machine_State_Length;
procedure Pop_Frame
(M : Machine_State;
Info : Subprogram_Info_Type)
is
procedure Get_Prev_Invo_Handle (
Result : out Invo_Handle_Type; ICB : in Invo_Handle_Type);
pragma Interface (External, Get_Prev_Invo_Handle);
pragma Import_Valued_Procedure
(Get_Prev_Invo_Handle, "LIB$GET_PREV_INVO_HANDLE",
(Invo_Handle_Type, Invo_Handle_Type),
(Value, Value));
Prev_Handle : aliased Invo_Handle_Type;
begin
Get_Prev_Invo_Handle (Prev_Handle, To_Invo_Handle_Access (M).all);
To_Invo_Handle_Access (M).all := Prev_Handle;
end Pop_Frame;
procedure Set_Machine_State (M : Machine_State) is
procedure Get_Curr_Invo_Context
(Invo_Context : out Invo_Context_Blk_Type);
pragma Interface (External, Get_Curr_Invo_Context);
pragma Import_Valued_Procedure
(Get_Curr_Invo_Context, "LIB$GET_CURR_INVO_CONTEXT",
(Invo_Context_Blk_Type),
(Reference));
procedure Get_Invo_Handle (
Result : out Invo_Handle_Type; Invo_Context : in Invo_Context_Blk_Type);
pragma Interface (External, Get_Invo_Handle);
pragma Import_Valued_Procedure (Get_Invo_Handle, "LIB$GET_INVO_HANDLE",
(Invo_Handle_Type, Invo_Context_Blk_Type),
(Value, Reference));
ICB : Invo_Context_Blk_Type;
Invo_Handle : aliased Invo_Handle_Type;
begin
Get_Curr_Invo_Context (ICB);
Get_Invo_Handle (Invo_Handle, ICB);
To_Invo_Handle_Access (M).all := Invo_Handle;
Pop_Frame (M, System.Null_Address);
end Set_Machine_State;
procedure Set_Signal_Machine_State
(M : Machine_State;
Context : System.Address) is
begin
null;
end Set_Signal_Machine_State;
end System.Machine_State_Operations;