Merge branch 'topic/kliemann/bb-runtimes-74-native-light-tasking' int…

…o 'master'

Implement light-tasking on Linux

See merge request eng/toolchain/bb-runtimes!127

linux/__init__.py

@@ -5,6 +5,7 @@ class Linux(DFBBTarget):
  def __init__(self):
  super().__init__()
  self.add_gnat_sources("src/s-macres__native.adb")
+ self.add_gnarl_sources("linux/adaint.c")
 
  def has_libc(self, profile):
  return True
@@ -34,7 +35,10 @@ def target(self):
 
  @property
  def system_ads(self):
- return {"light": "system-native-x86-light.ads"}
+ return {
+ "light": "system-native-x86-light.ads",
+ "light-tasking": "system-native-x86-light-tasking.ads",
+ }
 
 
 class X8664Linux(Linux):
@@ -48,7 +52,10 @@ def is_64bit(self):
 
  @property
  def system_ads(self):
- return {"light": "system-native-x86-light.ads"}
+ return {
+ "light": "system-native-x86-light.ads",
+ "light-tasking": "system-native-x86-light-tasking.ads",
+ }
 
 
 class Aarch64Linux(Linux):
@@ -62,4 +69,7 @@ def is_64bit(self):
 
  @property
  def system_ads(self):
- return {"light": "system-native-arm-light.ads"}
+ return {
+ "light": "system-native-arm-light.ads",
+ "light-tasking": "system-native-arm-light-tasking.ads",
+ }

linux/adaint.c

@@ -0,0 +1,44 @@
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <sys/syscall.h>
+#include <unistd.h>
+#include <sched.h>
+
+void *
+__gnat_lwp_self (void)
+{
+ return (void *) syscall (__NR_gettid);
+}
+
+cpu_set_t *
+__gnat_cpu_alloc (size_t count)
+{
+ return CPU_ALLOC (count);
+}
+
+size_t
+__gnat_cpu_alloc_size (size_t count)
+{
+ return CPU_ALLOC_SIZE (count);
+}
+
+void
+__gnat_cpu_free (cpu_set_t *set)
+{
+ CPU_FREE (set);
+}
+
+void
+__gnat_cpu_zero (size_t count, cpu_set_t *set)
+{
+ CPU_ZERO_S (count, set);
+}
+
+void
+__gnat_cpu_set (int cpu, size_t count, cpu_set_t *set)
+{
+ /* Ada handles CPU numbers starting from 1, while C identifies the first
+ CPU by a 0, so we need to adjust. */
+ CPU_SET_S (cpu - 1, count, set);
+}

src/system/system-native-arm-light-tasking.ads

@@ -0,0 +1,184 @@
+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M --
+-- --
+-- S p e c --
+-- (x86-64 Version) --
+-- --
+-- Copyright (C) 1992-2023, Free Software Foundation, Inc. --
+-- --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the contents of the part following the private keyword. --
+-- --
+-- 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. --
+-- --
+------------------------------------------------------------------------------
+
+pragma Restrictions (No_Exception_Propagation);
+-- Only local exception handling is supported in this profile
+
+pragma Restrictions (No_Exception_Registration);
+-- Disable exception name registration. This capability is not used because
+-- it is only required by exception stream attributes which are not supported
+-- in this run time.
+
+pragma Restrictions (No_Implicit_Dynamic_Code);
+-- Pointers to nested subprograms are not allowed in this run time, in order
+-- to prevent the compiler from building "trampolines".
+
+pragma Restrictions (No_Finalization);
+-- Controlled types are not supported in this run time
+
+pragma Restrictions (No_Use_Of_Pragma => Attach_Handler);
+pragma Restrictions (No_Specification_Of_Aspect => Attach_Handler);
+-- This pragma is not supported by the Ravenscar Cert profile
+
+pragma Profile (Jorvik);
+-- This is a bare metal tasking runtime
+
+package System is
+ pragma Pure;
+ -- Note that we take advantage of the implementation permission to make
+ -- this unit Pure instead of Preelaborable; see RM 13.7.1(15). In Ada
+ -- 2005, this is Pure in any case (AI-362).
+
+ pragma No_Elaboration_Code_All;
+ -- Allow the use of that restriction in units that WITH this unit
+
+ type Name is (SYSTEM_NAME_GNAT);
+ System_Name : constant Name := SYSTEM_NAME_GNAT;
+
+ -- System-Dependent Named Numbers
+
+ Min_Int : constant := -2 ** (Standard'Max_Integer_Size - 1);
+ Max_Int : constant := 2 ** (Standard'Max_Integer_Size - 1) - 1;
+
+ Max_Binary_Modulus : constant := 2 ** Standard'Max_Integer_Size;
+ Max_Nonbinary_Modulus : constant := 2 ** Integer'Size - 1;
+
+ Max_Base_Digits : constant := Long_Long_Float'Digits;
+ Max_Digits : constant := Long_Long_Float'Digits;
+
+ Max_Mantissa : constant := Standard'Max_Integer_Size - 1;
+ Fine_Delta : constant := 2.0 ** (-Max_Mantissa);
+
+ Tick : constant := 0.000_001;
+
+ -- Storage-related Declarations
+
+ type Address is private;
+ pragma Preelaborable_Initialization (Address);
+ Null_Address : constant Address;
+
+ Storage_Unit : constant := 8;
+ Word_Size : constant := Standard'Word_Size;
+ Memory_Size : constant := 2 ** Word_Size;
+
+ -- Address comparison
+
+ function "<" (Left, Right : Address) return Boolean;
+ function "<=" (Left, Right : Address) return Boolean;
+ function ">" (Left, Right : Address) return Boolean;
+ function ">=" (Left, Right : Address) return Boolean;
+ function "=" (Left, Right : Address) return Boolean;
+
+ pragma Import (Intrinsic, "<");
+ pragma Import (Intrinsic, "<=");
+ pragma Import (Intrinsic, ">");
+ pragma Import (Intrinsic, ">=");
+ pragma Import (Intrinsic, "=");
+
+ -- Other System-Dependent Declarations
+
+ type Bit_Order is (High_Order_First, Low_Order_First);
+ Default_Bit_Order : constant Bit_Order :=
+ Bit_Order'Val (Standard'Default_Bit_Order);
+ pragma Warnings (Off, Default_Bit_Order); -- kill constant condition warning
+
+ -- Priority-related Declarations (RM D.1)
+
+ -- 0 .. 98 corresponds to the system priority range 1 .. 99.
+ --
+ -- If the scheduling policy is SCHED_FIFO or SCHED_RR the runtime makes use
+ -- of the entire range provided by the system.
+ --
+ -- If the scheduling policy is SCHED_OTHER the only valid system priority
+ -- is 1 and other values are simply ignored.
+
+ Max_Priority : constant Positive := 97;
+ Max_Interrupt_Priority : constant Positive := 98;
+
+ subtype Any_Priority is Integer range 0 .. 98;
+ subtype Priority is Any_Priority range 0 .. 97;
+ subtype Interrupt_Priority is Any_Priority range 98 .. 98;
+
+ Default_Priority : constant Priority := 48;
+ -- By default, the priority assigned is the one in the middle of the
+ -- Priority range.
+
+private
+
+ type Address is mod Memory_Size;
+ for Address'Size use Standard'Address_Size;
+
+ Null_Address : constant Address := 0;
+
+ --------------------------------------
+ -- System Implementation Parameters --
+ --------------------------------------
+
+ -- These parameters provide information about the target that is used
+ -- by the compiler. They are in the private part of System, where they
+ -- can be accessed using the special circuitry in the Targparm unit
+ -- whose source should be consulted for more detailed descriptions
+ -- of the individual switch values.
+
+ Atomic_Sync_Default : constant Boolean := False;
+ Backend_Divide_Checks : constant Boolean := False;
+ Backend_Overflow_Checks : constant Boolean := True;
+ Command_Line_Args : constant Boolean := False;
+ Configurable_Run_Time : constant Boolean := True;
+ Denorm : constant Boolean := True;
+ Duration_32_Bits : constant Boolean := False;
+ Exit_Status_Supported : constant Boolean := True;
+ Fractional_Fixed_Ops : constant Boolean := False;
+ Frontend_Layout : constant Boolean := False;
+ Machine_Overflows : constant Boolean := False;
+ Machine_Rounds : constant Boolean := True;
+ Preallocated_Stacks : constant Boolean := False;
+ Signed_Zeros : constant Boolean := True;
+ Stack_Check_Default : constant Boolean := False;
+ Stack_Check_Probes : constant Boolean := False;
+ Stack_Check_Limits : constant Boolean := False;
+ Support_Aggregates : constant Boolean := True;
+ Support_Atomic_Primitives : constant Boolean := True;
+ Support_Composite_Assign : constant Boolean := True;
+ Support_Composite_Compare : constant Boolean := True;
+ Support_Long_Shifts : constant Boolean := True;
+ Always_Compatible_Rep : constant Boolean := True;
+ Suppress_Standard_Library : constant Boolean := True;
+ Use_Ada_Main_Program_Name : constant Boolean := False;
+ Frontend_Exceptions : constant Boolean := False;
+ ZCX_By_Default : constant Boolean := True;
+
+end System;

src/system/system-native-arm-light.ads

@@ -157,6 +157,7 @@ private
  Stack_Check_Probes : constant Boolean := False;
  Stack_Check_Limits : constant Boolean := False;
  Support_Aggregates : constant Boolean := True;
+ Support_Atomic_Primitives : constant Boolean := True;
  Support_Composite_Assign : constant Boolean := True;
  Support_Composite_Compare : constant Boolean := True;
  Support_Long_Shifts : constant Boolean := True;