35 lines
1.3 KiB
Diff
35 lines
1.3 KiB
Diff
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2014-04-22 Richard Henderson <rth@redhat.com>
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* init.c [__linux__] (HAVE_GNAT_ALTERNATE_STACK): New define.
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(__gnat_alternate_stack): Enable for all linux except ia64.
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--- gcc/ada/init.c
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+++ gcc/ada/init.c
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@@ -556,9 +556,14 @@ __gnat_error_handler (int sig, siginfo_t *si ATTRIBUTE_UNUSED, void *ucontext)
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Raise_From_Signal_Handler (exception, msg);
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}
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-#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
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-/* This must be in keeping with System.OS_Interface.Alternate_Stack_Size. */
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-char __gnat_alternate_stack[16 * 1024]; /* 2 * SIGSTKSZ */
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+#ifndef __ia64__
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+#define HAVE_GNAT_ALTERNATE_STACK 1
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+/* This must be in keeping with System.OS_Interface.Alternate_Stack_Size.
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+ It must be larger than MINSIGSTKSZ and hopefully near 2 * SIGSTKSZ. */
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+# if 16 * 1024 < MINSIGSTKSZ
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+# error "__gnat_alternate_stack too small"
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+# endif
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+char __gnat_alternate_stack[16 * 1024];
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#endif
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#ifdef __XENO__
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@@ -612,7 +617,7 @@ __gnat_install_handler (void)
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sigaction (SIGBUS, &act, NULL);
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if (__gnat_get_interrupt_state (SIGSEGV) != 's')
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{
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-#if defined (i386) || defined (__x86_64__) || defined (__powerpc__)
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+#ifdef HAVE_GNAT_ALTERNATE_STACK
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/* Setup an alternate stack region for the handler execution so that
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stack overflows can be handled properly, avoiding a SEGV generation
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from stack usage by the handler itself. */
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