v4.19.13 snapshot.
diff --git a/scripts/decode_stacktrace.sh b/scripts/decode_stacktrace.sh
new file mode 100755
index 0000000..64220e3
--- /dev/null
+++ b/scripts/decode_stacktrace.sh
@@ -0,0 +1,154 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# (c) 2014, Sasha Levin <sasha.levin@oracle.com>
+#set -x
+
+if [[ $# < 2 ]]; then
+ echo "Usage:"
+ echo " $0 [vmlinux] [base path] [modules path]"
+ exit 1
+fi
+
+vmlinux=$1
+basepath=$2
+modpath=$3
+declare -A cache
+declare -A modcache
+
+parse_symbol() {
+ # The structure of symbol at this point is:
+ # ([name]+[offset]/[total length])
+ #
+ # For example:
+ # do_basic_setup+0x9c/0xbf
+
+ if [[ $module == "" ]] ; then
+ local objfile=$vmlinux
+ elif [[ "${modcache[$module]+isset}" == "isset" ]]; then
+ local objfile=${modcache[$module]}
+ else
+ [[ $modpath == "" ]] && return
+ local objfile=$(find "$modpath" -name $module.ko -print -quit)
+ [[ $objfile == "" ]] && return
+ modcache[$module]=$objfile
+ fi
+
+ # Remove the englobing parenthesis
+ symbol=${symbol#\(}
+ symbol=${symbol%\)}
+
+ # Strip the symbol name so that we could look it up
+ local name=${symbol%+*}
+
+ # Use 'nm vmlinux' to figure out the base address of said symbol.
+ # It's actually faster to call it every time than to load it
+ # all into bash.
+ if [[ "${cache[$module,$name]+isset}" == "isset" ]]; then
+ local base_addr=${cache[$module,$name]}
+ else
+ local base_addr=$(nm "$objfile" | grep -i ' t ' | awk "/ $name\$/ {print \$1}" | head -n1)
+ cache[$module,$name]="$base_addr"
+ fi
+ # Let's start doing the math to get the exact address into the
+ # symbol. First, strip out the symbol total length.
+ local expr=${symbol%/*}
+
+ # Now, replace the symbol name with the base address we found
+ # before.
+ expr=${expr/$name/0x$base_addr}
+
+ # Evaluate it to find the actual address
+ expr=$((expr))
+ local address=$(printf "%x\n" "$expr")
+
+ # Pass it to addr2line to get filename and line number
+ # Could get more than one result
+ if [[ "${cache[$module,$address]+isset}" == "isset" ]]; then
+ local code=${cache[$module,$address]}
+ else
+ local code=$(addr2line -i -e "$objfile" "$address")
+ cache[$module,$address]=$code
+ fi
+
+ # addr2line doesn't return a proper error code if it fails, so
+ # we detect it using the value it prints so that we could preserve
+ # the offset/size into the function and bail out
+ if [[ $code == "??:0" ]]; then
+ return
+ fi
+
+ # Strip out the base of the path
+ code=${code//$basepath/""}
+
+ # In the case of inlines, move everything to same line
+ code=${code//$'\n'/' '}
+
+ # Replace old address with pretty line numbers
+ symbol="$name ($code)"
+}
+
+decode_code() {
+ local scripts=`dirname "${BASH_SOURCE[0]}"`
+
+ echo "$1" | $scripts/decodecode
+}
+
+handle_line() {
+ local words
+
+ # Tokenize
+ read -a words <<<"$1"
+
+ # Remove hex numbers. Do it ourselves until it happens in the
+ # kernel
+
+ # We need to know the index of the last element before we
+ # remove elements because arrays are sparse
+ local last=$(( ${#words[@]} - 1 ))
+
+ for i in "${!words[@]}"; do
+ # Remove the address
+ if [[ ${words[$i]} =~ \[\<([^]]+)\>\] ]]; then
+ unset words[$i]
+ fi
+
+ # Format timestamps with tabs
+ if [[ ${words[$i]} == \[ && ${words[$i+1]} == *\] ]]; then
+ unset words[$i]
+ words[$i+1]=$(printf "[%13s\n" "${words[$i+1]}")
+ fi
+ done
+
+ if [[ ${words[$last]} =~ \[([^]]+)\] ]]; then
+ module=${words[$last]}
+ module=${module#\[}
+ module=${module%\]}
+ symbol=${words[$last-1]}
+ unset words[$last-1]
+ else
+ # The symbol is the last element, process it
+ symbol=${words[$last]}
+ module=
+ fi
+
+ unset words[$last]
+ parse_symbol # modifies $symbol
+
+ # Add up the line number to the symbol
+ echo "${words[@]}" "$symbol $module"
+}
+
+while read line; do
+ # Let's see if we have an address in the line
+ if [[ $line =~ \[\<([^]]+)\>\] ]] ||
+ [[ $line =~ [^+\ ]+\+0x[0-9a-f]+/0x[0-9a-f]+ ]]; then
+ # Translate address to line numbers
+ handle_line "$line"
+ # Is it a code line?
+ elif [[ $line == *Code:* ]]; then
+ decode_code "$line"
+ else
+ # Nothing special in this line, show it as is
+ echo "$line"
+ fi
+done