aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.8.3/gcc/ada/s-atocou-x86.adb
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.8.3/gcc/ada/s-atocou-x86.adb')
-rw-r--r--gcc-4.8.3/gcc/ada/s-atocou-x86.adb86
1 files changed, 86 insertions, 0 deletions
diff --git a/gcc-4.8.3/gcc/ada/s-atocou-x86.adb b/gcc-4.8.3/gcc/ada/s-atocou-x86.adb
new file mode 100644
index 000000000..bd02c3569
--- /dev/null
+++ b/gcc-4.8.3/gcc/ada/s-atocou-x86.adb
@@ -0,0 +1,86 @@
+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . A T O M I C _ C O U N T E R S --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2011, AdaCore --
+-- --
+-- 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 implementation of the package for x86 processor. GCC can't generate
+-- code for atomic builtins for 386 CPU. Only increment/decrement instructions
+-- are supported, thus this implementaton uses machine code insertions to
+-- access the necessary instructions.
+
+with System.Machine_Code;
+
+package body System.Atomic_Counters is
+
+ -- Add comments showing in normal asm language what we generate???
+
+ ---------------
+ -- Decrement --
+ ---------------
+
+ function Decrement (Item : in out Atomic_Counter) return Boolean is
+ Aux : Boolean;
+
+ begin
+ System.Machine_Code.Asm
+ (Template =>
+ "lock%; decl" & ASCII.HT & "%0" & ASCII.LF & ASCII.HT
+ & "sete %1",
+ Outputs =>
+ (Unsigned_32'Asm_Output ("=m", Item.Value),
+ Boolean'Asm_Output ("=qm", Aux)),
+ Inputs => Unsigned_32'Asm_Input ("m", Item.Value),
+ Volatile => True);
+
+ return Aux;
+ end Decrement;
+
+ ---------------
+ -- Increment --
+ ---------------
+
+ procedure Increment (Item : in out Atomic_Counter) is
+ begin
+ System.Machine_Code.Asm
+ (Template => "lock%; incl" & ASCII.HT & "%0",
+ Outputs => Unsigned_32'Asm_Output ("=m", Item.Value),
+ Inputs => Unsigned_32'Asm_Input ("m", Item.Value),
+ Volatile => True);
+ end Increment;
+
+ ------------
+ -- Is_One --
+ ------------
+
+ function Is_One (Item : Atomic_Counter) return Boolean is
+ begin
+ return Item.Value = 1;
+ end Is_One;
+
+end System.Atomic_Counters;