3 files changed, 35 insertions, 2 deletions
diff --git a/erts/etc/unix/etp-commands.in b/erts/etc/unix/etp-commands.in
index bf6eb00314..e22771c582 100644
--- a/erts/etc/unix/etp-commands.in
+++ b/erts/etc/unix/etp-commands.in
@@ -3552,6 +3552,39 @@ document etp-carrier-blocks
 %---------------------------------------------------------------------------
 end
 
+define etp-address-to-beam-opcode
+  set $etp_i = 0
+  set $etp_min_diff = ((UWord)1 << (sizeof(UWord)*8 - 1))
+  set $etp_min_opcode = -1
+  set $etp_addr = (UWord) ($arg0)
+
+  while $etp_i < num_instructions && $etp_min_diff > 0
+    if ($etp_addr - (UWord)beam_ops[$etp_i]) < $etp_min_diff
+      set $etp_min_diff = $etp_addr - (UWord)beam_ops[$etp_i]
+      set $etp_min_opcode = $etp_i
+    end
+    set $etp_i = $etp_i + 1
+  end
+  if $etp_min_diff == 0
+    printf "Address %p is start of '%s'\n", $etp_addr, opc[$etp_min_opcode].name
+  else
+    if $etp_min_opcode >= 0
+      printf "Address is %ld bytes into opcode '%s' at %p\n", $etp_min_diff, opc[$etp_min_opcode].name, beam_ops[$etp_min_opcode]
+    else
+      printf "Invalid opcode address\n"
+    end
+  end
+end
+
+document etp-address-to-beam-opcode
+%---------------------------------------------------------------------------
+% Get beam opcode from a native instruction address (within process_main())
+% Arg: Instructon pointer value
+%
+% Does not work with NO_JUMP_TABLE
+%---------------------------------------------------------------------------
+end
+
 
 ############################################################################
 # Toolbox parameter handling
diff --git a/erts/etc/win32/Install.c b/erts/etc/win32/Install.c
index 500fd166f8..9d85d642ab 100644
--- a/erts/etc/win32/Install.c
+++ b/erts/etc/win32/Install.c
@@ -80,7 +80,7 @@ int wmain(int argc, wchar_t **argv)
 	}
     }
     if (root == NULL) {
-	if (module = NULL) {
+	if (module == NULL) {
 	    fprintf(stderr, "Cannot GetModuleHandle()\n");
 	    exit(1);
 	}
diff --git a/erts/etc/win32/erl.c b/erts/etc/win32/erl.c
index 1d116bf36e..772b668586 100644
--- a/erts/etc/win32/erl.c
+++ b/erts/etc/win32/erl.c
@@ -264,7 +264,7 @@ static void get_parameters(void)
     int len;
 
 
-    if (module = NULL) {
+    if (module == NULL) {
         error("Cannot GetModuleHandle()");
     }