[GitHub] [incubator-nuttx] yamt commented on a change in pull request #2673: esp32: Add a gdb script to show backtrace

[GitBox <gi...@apache.org>]

yamt commented on a change in pull request #2673:
URL: https://github.com/apache/incubator-nuttx/pull/2673#discussion_r556923243



##########
File path: tools/esp32/backtrace.gdbscript
##########
@@ -0,0 +1,85 @@
+############################################################################
+# tools/esp32/backtrace.gdbscript
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+# Usage:
+#
+#   -------
+#       xtensa_registerdump:    PC: 400d5775    PS: 00060e33
+#       xtensa_registerdump:    A0: 800d504c    A1: 3ffd8080    A2: 3ffdfb28    A3: 00000001
+#   -------
+#       (gdb) esp32_bt 0x400d5775 0x800d504c 0x3ffd8080
+#   -------
+#
+# References:
+#
+#   Xtensa(R) Instruction Set Architecture (ISA) Reference Manual
+#   4.7.1.4 Call, Entry, and Return Mechanism
+#   4.7.1.5 Windowed Procedure-Call Protocol
+
+define esp32_bt
+    set $pc = $arg0
+    set $a0 = $arg1
+    set $a1 = $arg2
+    set $pc_topbits = (int)$pc & 0xc0000000
+    # The return address from xtensa_sig_deliver to _xtensa_sig_trampoline
+    set $sig_tramp_ra = (int)(_xtensa_sig_trampoline + 2 * 3)
+    print/a $pc
+    while (1)
+        # Note: "- 3" to workaround the case where "call" is
+        # the last instruction in the calling function.
+        set $next_pc = (($a0 & 0x3fffffff) | $pc_topbits) - 3
+        print/a $next_pc

Review comment:
       do you mean CONFIG_XTENSA_DUMPBT_ON_ASSERT?
   
   * CONFIG_XTENSA_DUMPBT_ON_ASSERT dumps the fault handler stack but not user's
   * this version deals with signal trampoline
   * ability to specify pc/a0/a1 is handy for me




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