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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- SYSTEM.MACHINE_STATE_OPERATIONS --
+-- --
+-- B o d y --
+-- (Version for IRIX/MIPS) --
+-- --
+-- Copyright (C) 1999-2009, Free Software Foundation, Inc. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 3, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This version of Ada.Exceptions.Machine_State_Operations is for use on
+-- SGI Irix systems. By means of compile time conditional calculations, it
+-- can handle both n32/n64 and o32 modes.
+
+with System.Machine_Code; use System.Machine_Code;
+with System.Memory;
+with System.Soft_Links; use System.Soft_Links;
+with Ada.Unchecked_Conversion;
+
+package body System.Machine_State_Operations is
+
+ use System.Storage_Elements;
+
+ -- The exc_unwind function in libexc operates on a Sigcontext
+
+ -- Type sigcontext_t is defined in /usr/include/sys/signal.h.
+ -- We define an equivalent Ada type here. From the comments in
+ -- signal.h:
+
+ -- sigcontext is not part of the ABI - so this version is used to
+ -- handle 32 and 64 bit applications - it is a constant size regardless
+ -- of compilation mode, and always returns 64 bit register values
+
+ type Uns32 is mod 2 ** 32;
+ type Uns64 is mod 2 ** 64;
+
+ type Uns32_Ptr is access all Uns32;
+ type Uns64_Array is array (Integer range <>) of Uns64;
+
+ type Reg_Array is array (0 .. 31) of Uns64;
+
+ type Sigcontext is record
+ SC_Regmask : Uns32; -- 0
+ SC_Status : Uns32; -- 4
+ SC_PC : Uns64; -- 8
+ SC_Regs : Reg_Array; -- 16
+ SC_Fpregs : Reg_Array; -- 272
+ SC_Ownedfp : Uns32; -- 528
+ SC_Fpc_Csr : Uns32; -- 532
+ SC_Fpc_Eir : Uns32; -- 536
+ SC_Ssflags : Uns32; -- 540
+ SC_Mdhi : Uns64; -- 544
+ SC_Mdlo : Uns64; -- 552
+ SC_Cause : Uns64; -- 560
+ SC_Badvaddr : Uns64; -- 568
+ SC_Triggersave : Uns64; -- 576
+ SC_Sigset : Uns64; -- 584
+ SC_Fp_Rounded_Result : Uns64; -- 592
+ SC_Pancake : Uns64_Array (0 .. 5);
+ SC_Pad : Uns64_Array (0 .. 26);
+ end record;
+
+ type Sigcontext_Ptr is access all Sigcontext;
+
+ SC_Regs_Pos : constant String := "16";
+ SC_Fpregs_Pos : constant String := "272";
+ -- Byte offset of the Integer and Floating Point register save areas
+ -- within the Sigcontext.
+
+ function To_Sigcontext_Ptr is
+ new Ada.Unchecked_Conversion (Machine_State, Sigcontext_Ptr);
+
+ type Addr_Int is mod 2 ** Long_Integer'Size;
+ -- An unsigned integer type whose size is the same as System.Address.
+ -- We rely on the fact that Long_Integer'Size = System.Address'Size in
+ -- all ABIs. Type Addr_Int can be converted to Uns64.
+
+ function To_Code_Loc is
+ new Ada.Unchecked_Conversion (Addr_Int, Code_Loc);
+ function To_Addr_Int is
+ new Ada.Unchecked_Conversion (System.Address, Addr_Int);
+ function To_Uns32_Ptr is
+ new Ada.Unchecked_Conversion (Addr_Int, Uns32_Ptr);
+
+ --------------------------------
+ -- ABI-Dependent Declarations --
+ --------------------------------
+
+ o32 : constant Boolean := System.Word_Size = 32;
+ n32 : constant Boolean := System.Word_Size = 64;
+ o32n : constant Natural := Boolean'Pos (o32);
+ n32n : constant Natural := Boolean'Pos (n32);
+ -- Flags to indicate which ABI is in effect for this compilation. For the
+ -- purposes of this unit, the n32 and n64 ABIs are identical.
+
+ LSC : constant Character := Character'Val (o32n * Character'Pos ('w') +
+ n32n * Character'Pos ('d'));
+ -- This is 'w' for o32, and 'd' for n32/n64, used for constructing the
+ -- load/store instructions used to save/restore machine instructions.
+
+ Roff : constant Character := Character'Val (o32n * Character'Pos ('4') +
+ n32n * Character'Pos ('0'));
+ -- Offset from first byte of a __uint64 register save location where
+ -- the register value is stored. For n32/64 we store the entire 64
+ -- bit register into the uint64. For o32, only 32 bits are stored
+ -- at an offset of 4 bytes. This is used as part of expressions with
+ -- '+' signs on both sides, so a null offset has to be '0' and not ' '
+ -- to avoid assembler syntax errors on "X + + Y" in the latter case.
+
+ procedure Update_GP (Scp : Sigcontext_Ptr);
+
+ ---------------
+ -- Update_GP --
+ ---------------
+
+ procedure Update_GP (Scp : Sigcontext_Ptr) is
+
+ type F_op is mod 2 ** 6;
+ type F_reg is mod 2 ** 5;
+ type F_imm is new Short_Integer;
+
+ type I_Type is record
+ op : F_op;
+ rs : F_reg;
+ rt : F_reg;
+ imm : F_imm;
+ end record;
+
+ pragma Pack (I_Type);
+ for I_Type'Size use 32;
+
+ type I_Type_Ptr is access all I_Type;
+
+ LW : constant F_op := 2#100011#;
+ Reg_GP : constant := 28;
+
+ type Address_Int is mod 2 ** Standard'Address_Size;
+ function To_I_Type_Ptr is new
+ Ada.Unchecked_Conversion (Address_Int, I_Type_Ptr);
+
+ Ret_Ins : constant I_Type_Ptr := To_I_Type_Ptr (Address_Int (Scp.SC_PC));
+ GP_Ptr : Uns32_Ptr;
+
+ begin
+ if Ret_Ins.op = LW and then Ret_Ins.rt = Reg_GP then
+ GP_Ptr := To_Uns32_Ptr
+ (Addr_Int (Scp.SC_Regs (Integer (Ret_Ins.rs)))
+ + Addr_Int (Ret_Ins.imm));
+ Scp.SC_Regs (Reg_GP) := Uns64 (GP_Ptr.all);
+ end if;
+ end Update_GP;
+
+ ----------------------------
+ -- Allocate_Machine_State --
+ ----------------------------
+
+ function Allocate_Machine_State return Machine_State is
+ begin
+ return Machine_State
+ (Memory.Alloc (Sigcontext'Max_Size_In_Storage_Elements));
+ end Allocate_Machine_State;
+
+ ----------------
+ -- Fetch_Code --
+ ----------------
+
+ function Fetch_Code (Loc : Code_Loc) return Code_Loc is
+ begin
+ return Loc;
+ end Fetch_Code;
+
+ ------------------------
+ -- Free_Machine_State --
+ ------------------------
+
+ procedure Free_Machine_State (M : in out Machine_State) is
+ begin
+ Memory.Free (Address (M));
+ M := Machine_State (Null_Address);
+ end Free_Machine_State;
+
+ ------------------
+ -- Get_Code_Loc --
+ ------------------
+
+ function Get_Code_Loc (M : Machine_State) return Code_Loc is
+ SC : constant Sigcontext_Ptr := To_Sigcontext_Ptr (M);
+ begin
+ return To_Code_Loc (Addr_Int (SC.SC_PC));
+ end Get_Code_Loc;
+
+ --------------------------
+ -- Machine_State_Length --
+ --------------------------
+
+ function Machine_State_Length return Storage_Offset is
+ begin
+ return Sigcontext'Max_Size_In_Storage_Elements;
+ end Machine_State_Length;
+
+ ---------------
+ -- Pop_Frame --
+ ---------------
+
+ procedure Pop_Frame (M : Machine_State) is
+ Scp : constant Sigcontext_Ptr := To_Sigcontext_Ptr (M);
+
+ procedure Exc_Unwind (Scp : Sigcontext_Ptr; Fde : Long_Integer := 0);
+ pragma Import (C, Exc_Unwind, "exc_unwind");
+
+ pragma Linker_Options ("-lexc");
+
+ begin
+ -- exc_unwind is apparently not thread-safe under IRIX, so protect it
+ -- against race conditions within the GNAT run time.
+ -- ??? Note that we might want to use a fine grained lock here since
+ -- Lock_Task is used in many other places.
+
+ Lock_Task.all;
+
+ Exc_Unwind (Scp);
+
+ Unlock_Task.all;
+
+ if Scp.SC_PC = 0 or else Scp.SC_PC = 1 then
+
+ -- A return value of 0 or 1 means exc_unwind couldn't find a parent
+ -- frame. Propagate_Exception expects a zero return address to
+ -- indicate TOS.
+
+ Scp.SC_PC := 0;
+
+ else
+ -- Set the GP to restore to the caller value (not callee value)
+ -- This is done only in o32 mode. In n32/n64 mode, GP is a normal
+ -- callee save register
+
+ if o32 then
+ Update_GP (Scp);
+ end if;
+
+ -- Adjust the return address to the call site, not the
+ -- instruction following the branch delay slot. This may
+ -- be necessary if the last instruction of a pragma No_Return
+ -- subprogram is a call. The first instruction following the
+ -- delay slot may be the start of another subprogram. We back
+ -- off the address by 8, which points safely into the middle
+ -- of the generated subprogram code, avoiding end effects.
+
+ Scp.SC_PC := Scp.SC_PC - 8;
+ end if;
+ end Pop_Frame;
+
+ -----------------------
+ -- Set_Machine_State --
+ -----------------------
+
+ procedure Set_Machine_State (M : Machine_State) is
+
+ SI : constant String (1 .. 2) := 's' & LSC;
+ -- This is "sw" in o32 mode, and "sd" in n32 mode
+
+ SF : constant String (1 .. 4) := 's' & LSC & "c1";
+ -- This is "swc1" in o32 mode and "sdc1" in n32 mode
+
+ PI : String renames SC_Regs_Pos;
+ PF : String renames SC_Fpregs_Pos;
+
+ Scp : Sigcontext_Ptr;
+
+ begin
+ -- Save the integer registers. Note that we know that $4 points
+ -- to M, since that is where the first parameter is passed.
+ -- Restore integer registers from machine state. Note that we know
+ -- that $4 points to M since this is the standard calling sequence
+
+ <<Past_Prolog>>
+
+ Asm (SI & " $16, 16*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $17, 17*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $18, 18*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $19, 19*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $20, 20*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $21, 21*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $22, 22*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $23, 23*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $24, 24*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $25, 25*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $26, 26*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $27, 27*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $28, 28*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $29, 29*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $30, 30*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+ Asm (SI & " $31, 31*8+" & Roff & "+" & PI & "($4)", Volatile => True);
+
+ -- Restore floating-point registers from machine state
+
+ Asm (SF & " $f16, 16*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f17, 17*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f18, 18*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f19, 19*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f20, 20*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f21, 21*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f22, 22*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f23, 23*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f24, 24*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f25, 25*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f26, 26*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f27, 27*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f28, 28*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f29, 29*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f30, 30*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+ Asm (SF & " $f31, 31*8+" & Roff & "+" & PF & "($4)", Volatile => True);
+
+ -- Set the PC value for the context to a location after the
+ -- prolog has been executed.
+
+ Scp := To_Sigcontext_Ptr (M);
+ Scp.SC_PC := Uns64 (To_Addr_Int (Past_Prolog'Address));
+
+ -- We saved the state *inside* this routine, but what we want is
+ -- the state at the call site. So we need to do one pop operation.
+ -- This pop operation will properly set the PC value in the machine
+ -- state, so there is no need to save PC in the above code.
+
+ Pop_Frame (M);
+ end Set_Machine_State;
+
+end System.Machine_State_Operations;