From 1acd66057d369a56fa9fa0a91ad68ee89356a9e3 Mon Sep 17 00:00:00 2001
From: Manuel Coenen <manuel@duet3d.com>
Date: Mon, 30 Nov 2020 15:27:17 +0100
Subject: Add README.md to stackanalyzer

---
 Tools/stackanalyzer/README.md | 48 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Tools/stackanalyzer/README.md

(limited to 'Tools')

diff --git a/Tools/stackanalyzer/README.md b/Tools/stackanalyzer/README.md
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+# stackanalyzer
+Small CLI tool to extract information about failure locations.
+
+To use this tool one needs to provide the output of `M122` (at least the line starting with "Stack:")
+as well as the map file created by the linker at build time. `stackanalyzer` will then search
+the location the error has happened and output the information extracted from the map file.
+
+## Usage
+```
+$ stackanalyzer --help
+Usage of linux/stackanalyzer:
+  -m122 string
+        Path to file with M122 output (even partial) or "-" for stdin (default "-")
+  -mapFile string
+        Path to .map file
+```
+
+## Examples
+### `AssertionFailed`
+Note that for failures of this type the line starting with "Last software reset at " has to be present in the input.
+
+```
+$ stackanalyzer -m122 m122AssertionFailed.txt -mapFile Duet3Firmware_MB6HC.map
+Faulted at:
+.rodata.prvTaskExitError.str1.4
+                0x004886b0        0xf C:\Eclipse\Firmware\FreeRTOS\SAME70\libFreeRTOS.a(queue.o)
+Error is at line: 1433
+```
+The stack above showed that an assertion failed in `queue.c` located (somewhere) in project `FreeRTOS`
+at line 1433. The user needs to look up that location and check which assertion failed.
+
+### `MemoryProtectionFault`
+
+```
+$ linux/stackanalyzer -m122 m122MemoryProtectionFault.txt -mapFile ../../Duet3/Duet3Firmware_MB6HC.map
+Faulted at:
+.text._ZN9FileStore5StoreEPKcjPj
+                0x0000000000404bb8       0xe8 ./src/Storage/FileStore.o
+                0x0000000000404bb8                FileStore::Write(char const*, unsigned int)
+Error is at offset: 0x5e
+```
+This stack analysis leads to the method `FileStore::Write()`. The user then needs to open the corrsponding
+`.s` file that is usually located next to the `.map` file search for the beginning of the method (use the
+first line after "Faulted at:") and then search for offset `0x5e`.
+
+## Building
+This tool is writting in Go and can be simply built by `go build stackanalyzer.go`. For convenience
+there are pre-built binaries for x86_64 Windows/Linux/MacOS in sub directories.
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