From patchwork Mon Jun 14 08:08:40 2010
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Subject: [Ada] Set up alternative signal stack for PowerPC Linux
Date: Sun, 13 Jun 2010 22:08:40 -0000
From: Arnaud Charlet <charlet@adacore.com>
X-Patchwork-Id: 55484
Message-Id: <20100614080840.GA30803@adacore.com>
To: gcc-patches@gcc.gnu.org
Cc: Jose Ruiz <ruiz@adacore.com>

This patch initializes the alternative signal stack for PowerPC Linux.

Tested on powerpc-linux, committed on trunk.

2010-06-14  Jose Ruiz  <ruiz@adacore.com>

	* init.c (__gnat_alternate_stack): Define this space for PowerPC linux
	(__gnat_install_handler, PowerPC linux): Activate the alternative
	signal stack.


Index: init.c
===================================================================
--- init.c	(revision 160705)
+++ init.c	(working copy)
@@ -706,7 +706,7 @@ __gnat_error_handler (int sig,
   Raise_From_Signal_Handler (exception, msg);
 }
 
-#if defined (i386) || defined (__x86_64__)
+#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
 /* This must be in keeping with System.OS_Interface.Alternate_Stack_Size.  */
 char __gnat_alternate_stack[16 * 1024]; /* 2 * SIGSTKSZ */
 #endif
@@ -747,7 +747,7 @@ __gnat_install_handler (void)
      handled properly, avoiding a SEGV generation from stack usage by the
      handler itself.  */
 
-#if defined (i386) || defined (__x86_64__)
+#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
   stack_t stack;
   stack.ss_sp = __gnat_alternate_stack;
   stack.ss_size = sizeof (__gnat_alternate_stack);
@@ -768,7 +768,7 @@ __gnat_install_handler (void)
     sigaction (SIGILL,  &act, NULL);
   if (__gnat_get_interrupt_state (SIGBUS) != 's')
     sigaction (SIGBUS,  &act, NULL);
-#if defined (i386) || defined (__x86_64__)
+#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
   act.sa_flags |= SA_ONSTACK;
 #endif
   if (__gnat_get_interrupt_state (SIGSEGV) != 's')