From f175f46b74efc2419fab09cfe4c09d741bcebf67 Mon Sep 17 00:00:00 2001
From: Sverker Eriksson <sverker@erlang.org>
Date: Wed, 17 Sep 2014 17:25:37 +0200
Subject: erts: Add gdb command etp-address-to-beam-opcode

---
 erts/etc/unix/etp-commands.in | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'erts/etc/unix/etp-commands.in')

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
-- 
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