From 5247fa62ed2d68076c63c6e7260a3a35dd88101f Mon Sep 17 00:00:00 2001
From: Bernhard Urban <bernhard.urban@xamarin.com>
Date: Wed, 14 Dec 2016 13:11:14 +0100
Subject: [PATCH] [exception] print process map when crashing on Linux

---
 mono/mini/mini-exceptions.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/mono/mini/mini-exceptions.c b/mono/mini/mini-exceptions.c
index b258a6cbfc9..00e6addd578 100644
--- a/mono/mini/mini-exceptions.c
+++ b/mono/mini/mini-exceptions.c
@@ -2422,6 +2422,34 @@ print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer d
 
 #ifndef MONO_CROSS_COMPILE
 
+static void print_process_map ()
+{
+#ifdef __linux__
+	FILE *fp = fopen ("/proc/self/maps", "r");
+	char line [256];
+
+	if (fp == NULL) {
+		mono_runtime_printf_err ("no /proc/self/maps, not on linux?\n");
+		return;
+	}
+
+	mono_runtime_printf_err ("/proc/self/maps:");
+
+	while (fgets (line, sizeof (line), fp)) {
+		// strip newline
+		size_t len = strlen (line) - 1;
+		if (len >= 0 && line [len] == '\n')
+			line [len] = '\0';
+
+		mono_runtime_printf_err ("%s", line);
+	}
+
+	fclose (fp);
+#else
+	/* do nothing */
+#endif
+}
+
 static gboolean handling_sigsegv = FALSE;
 
 /*
@@ -2464,6 +2492,8 @@ mono_handle_native_crash (const char *signal, void *ctx, MONO_SIG_HANDLER_INFO_T
 		mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
 	}
 
+	print_process_map ();
+
 #ifdef HAVE_BACKTRACE_SYMBOLS
  {
 	void *array [256];
-- 
2.25.1