libbacktrace: support ASLR on Windows

Patch from Björn Schäpers.

	* pecoff.c: Include <windows.h> if available.
	(coff_add): On Windows call GetModuleHandle to get base address.

diff --git a/libbacktrace/pecoff.c b/libbacktrace/pecoff.c
index 56af4828e27b803d0632d357288d5da364461554..f976a963bf3aa0173685eebc53bc61ed443a2125 100644 (file)
--- a/libbacktrace/pecoff.c
+++ b/libbacktrace/pecoff.c
@@ -39,6 +39,18 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include "backtrace.h"
 #include "internal.h"
 
+#ifdef HAVE_WINDOWS_H
+#ifndef WIN32_MEAN_AND_LEAN
+#define WIN32_MEAN_AND_LEAN
+#endif
+
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
+
+#include <windows.h>
+#endif
+
 /* Coff file header.  */
 
 typedef struct {
@@ -610,6 +622,7 @@ coff_add (struct backtrace_state *state, int descriptor,
   int debug_view_valid;
   int is_64;
   uintptr_t image_base;
+  uintptr_t base_address = 0;
   struct dwarf_sections dwarf_sections;
 
   *found_sym = 0;
@@ -856,7 +869,16 @@ coff_add (struct backtrace_state *state, int descriptor,
                                  + (sections[i].offset - min_offset));
     }
 
-  if (!backtrace_dwarf_add (state, /* base_address */ 0, &dwarf_sections,
+#ifdef HAVE_WINDOWS_H
+  {
+    uintptr_t module_handle;
+
+    module_handle = (uintptr_t) GetModuleHandle (NULL);
+    base_address = module_handle - image_base;
+  }
+#endif
+
+  if (!backtrace_dwarf_add (state, base_address, &dwarf_sections,
                            0, /* FIXME: is_bigendian */
                            NULL, /* altlink */
                            error_callback, data, fileline_fn,