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authorSverker Eriksson <[email protected]>2014-09-17 17:25:37 +0200
committerSverker Eriksson <[email protected]>2014-09-17 17:25:37 +0200
commitf175f46b74efc2419fab09cfe4c09d741bcebf67 (patch)
tree3eee8a5f451c72faf8c95f84b6637731cc9c5778 /erts/etc
parent56715334380680c1466d2a9165ea2f7affc93a78 (diff)
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erts: Add gdb command etp-address-to-beam-opcode
Diffstat (limited to 'erts/etc')
-rw-r--r--erts/etc/unix/etp-commands.in33
1 files changed, 33 insertions, 0 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