ada: Set correct minimum stack size for aarch64-linux

The minimum stack size defined by PTHREAD_STACK_MIN defined on
AArch64 Linux is 131072 bytes. Add a separate version for this
target to reflect that value. Previously the x86-64 value of 16384
bytes was used.

gcc/ada/ChangeLog:

	* Makefile.rtl: Use libgnat/s-parame__aarch64-linux.adb for
	s-parame.adb on aarch64-linux.
	* libgnat/s-parame__aarch64-linux.adb: Add file.

2 files changed, 83 insertions, 0 deletions

diff --git a/gcc/ada/Makefile.rtl b/gcc/ada/Makefile.rtl
index 4d32bc4..d686a30 100644
--- a/gcc/ada/Makefile.rtl
+++ b/gcc/ada/Makefile.rtl
@@ -2496,6 +2496,7 @@ ifeq ($(strip $(filter-out aarch64% linux%,$(target_cpu) $(target_os))),)
   s-osinte.adb<libgnarl/s-osinte__posix.adb \
   s-oslock.ads<libgnat/s-oslock__posix.ads \
   s-osprim.adb<libgnat/s-osprim__posix.adb \
+  s-parame.adb<libgnat/s-parame__aarch64-linux.adb \
   s-taprop.adb<libgnarl/s-taprop__linux.adb \
   s-tasinf.ads<libgnarl/s-tasinf__linux.ads \
   s-tasinf.adb<libgnarl/s-tasinf__linux.adb \
diff --git a/gcc/ada/libgnat/s-parame__aarch64-linux.adb b/gcc/ada/libgnat/s-parame__aarch64-linux.adb
new file mode 100644
index 0000000..3985b41
--- /dev/null
+++ b/gcc/ada/libgnat/s-parame__aarch64-linux.adb
@@ -0,0 +1,82 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                    S Y S T E M . P A R A M E T E R S                     --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          Copyright (C) 1995-2024, 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 is the version for AArch64 Linux
+
+package body System.Parameters is
+
+   -------------------------
+   -- Adjust_Storage_Size --
+   -------------------------
+
+   function Adjust_Storage_Size (Size : Size_Type) return Size_Type is
+   begin
+      if Size = Unspecified_Size then
+         return Default_Stack_Size;
+      elsif Size < Minimum_Stack_Size then
+         return Minimum_Stack_Size;
+      else
+         return Size;
+      end if;
+   end Adjust_Storage_Size;
+
+   ------------------------
+   -- Default_Stack_Size --
+   ------------------------
+
+   function Default_Stack_Size return Size_Type is
+      Default_Stack_Size : constant Integer;
+      pragma Import (C, Default_Stack_Size, "__gl_default_stack_size");
+   begin
+      if Default_Stack_Size = -1 then
+         return 2 * 1024 * 1024;
+      elsif Size_Type (Default_Stack_Size) < Minimum_Stack_Size then
+         return Minimum_Stack_Size;
+      else
+         return Size_Type (Default_Stack_Size);
+      end if;
+   end Default_Stack_Size;
+
+   ------------------------
+   -- Minimum_Stack_Size --
+   ------------------------
+
+   function Minimum_Stack_Size return Size_Type is
+   begin
+      --  12K is required for stack-checking to work reliably on most platforms
+      --  when using the GCC scheme to propagate an exception in the ZCX case.
+      --  131K is the value of PTHREAD_STACK_MIN under AArch64 Linux, so is a
+      --  reasonable default.
+
+      return 128 * 1024;
+   end Minimum_Stack_Size;
+
+end System.Parameters;