Mention PR gdb/17096 in ChangeLog

[deliverable/binutils-gdb.git] / gdb / main.c

diff --git a/gdb/main.c b/gdb/main.c
index a9fc378136e140b04d972671d454ba014003c34f..0d4d5122f2e4ced9fe399ed4b70fe51b58536914 100644 (file)
--- a/gdb/main.c
+++ b/gdb/main.c
@@ -45,6 +45,7 @@
 
 #include "filenames.h"
 #include "filestuff.h"
+#include <signal.h>
 
 /* The selected interpreter.  This will be used as a set command
    variable, so it should always be malloc'ed - since
@@ -288,6 +289,27 @@ get_init_files (const char **system_gdbinit,
   *local_gdbinit = localinit;
 }
 
+/* Try to set up an alternate signal stack for SIGSEGV handlers.
+   This allows us to handle SIGSEGV signals generated when the
+   normal process stack is exhausted.  If this stack is not set
+   up (sigaltstack is unavailable or fails) and a SIGSEGV is
+   generated when the normal stack is exhausted then the program
+   will behave as though no SIGSEGV handler was installed.  */
+
+static void
+setup_alternate_signal_stack (void)
+{
+#ifdef HAVE_SIGALTSTACK
+  stack_t ss;
+
+  ss.ss_sp = xmalloc (SIGSTKSZ);
+  ss.ss_size = SIGSTKSZ;
+  ss.ss_flags = 0;
+
+  sigaltstack(&ss, NULL);
+#endif
+}
+
 /* Call command_loop.  If it happens to return, pass that through as a
    non-zero return status.  */
 
@@ -785,6 +807,9 @@ captured_main (void *data)
       quiet = 1;
   }
 
+  /* Try to set up an alternate signal stack for SIGSEGV handlers.  */
+  setup_alternate_signal_stack ();
+
   /* Initialize all files.  Give the interpreter a chance to take
      control of the console via the deprecated_init_ui_hook ().  */
   gdb_init (gdb_program_name);
@@ -1173,7 +1198,8 @@ Output and user interface control:\n\n\
   fputs_unfiltered (_("\
   --dbx              DBX compatibility mode.\n\
   --xdb              XDB compatibility mode.\n\
-  --quiet            Do not print version number on startup.\n\n\
+  -q, --quiet, --silent\n\
+                     Do not print version number on startup.\n\n\
 "), stream);
   fputs_unfiltered (_("\
 Operating modes:\n\n\