Bug 906860: Ignore segfaults handled by AsmJSFaultHandler in gdb; r=jimb,gps

js/src/shell/Makefile.in

@@ -50,6 +50,10 @@ INSTALL_TARGETS += SHELL_INSTALL_AUTOLOAD
 SHELL_INSTALL_AUTOLOAD_FILES := $(CURDIR)/js-gdb.py
 SHELL_INSTALL_AUTOLOAD_DEST := $(DIST)/bin
 
+INSTALL_TARGETS += SHELL_INSTALL_AUTOLOAD_SCRIPT
+SHELL_INSTALL_AUTOLOAD_SCRIPT_FILES := js-gdb.gdb
+SHELL_INSTALL_AUTOLOAD_SCRIPT_DEST := $(CURDIR)
+
 include $(topsrcdir)/config/rules.mk
 
 # People expect the js shell to wind up in the top-level JS dir.

js/src/shell/js-gdb.gdb

@@ -0,0 +1,18 @@
+define hookpost-run
+    if ($sigaction)
+        call free($sigaction)
+        set $sigaction = 0
+    end
+end
+
+catch signal SIGSEGV
+commands
+    if !$sigaction
+        set $sigaction = malloc(sizeof(sigaction))
+    end
+    set $ignored = __GI___sigaction(11, 0, $sigaction)
+    set $handler = ((struct sigaction *)$sigaction)->__sigaction_handler.sa_handler
+    if $handler == AsmJSFaultHandler
+        continue
+    end
+end