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-rwxr-xr-xscripts/faddr2line271
1 files changed, 210 insertions, 61 deletions
diff --git a/scripts/faddr2line b/scripts/faddr2line
index 6c6439f69a72..1fa6beef9f97 100755
--- a/scripts/faddr2line
+++ b/scripts/faddr2line
@@ -44,17 +44,6 @@
set -o errexit
set -o nounset
-READELF="${CROSS_COMPILE:-}readelf"
-ADDR2LINE="${CROSS_COMPILE:-}addr2line"
-SIZE="${CROSS_COMPILE:-}size"
-NM="${CROSS_COMPILE:-}nm"
-
-command -v awk >/dev/null 2>&1 || die "awk isn't installed"
-command -v ${READELF} >/dev/null 2>&1 || die "readelf isn't installed"
-command -v ${ADDR2LINE} >/dev/null 2>&1 || die "addr2line isn't installed"
-command -v ${SIZE} >/dev/null 2>&1 || die "size isn't installed"
-command -v ${NM} >/dev/null 2>&1 || die "nm isn't installed"
-
usage() {
echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2
exit 1
@@ -69,19 +58,44 @@ die() {
exit 1
}
+UTIL_SUFFIX=""
+if [[ "${LLVM:-}" == "" ]]; then
+ UTIL_PREFIX=${CROSS_COMPILE:-}
+else
+ UTIL_PREFIX=llvm-
+
+ if [[ "${LLVM}" == *"/" ]]; then
+ UTIL_PREFIX=${LLVM}${UTIL_PREFIX}
+ elif [[ "${LLVM}" == "-"* ]]; then
+ UTIL_SUFFIX=${LLVM}
+ fi
+fi
+
+READELF="${UTIL_PREFIX}readelf${UTIL_SUFFIX}"
+ADDR2LINE="${UTIL_PREFIX}addr2line${UTIL_SUFFIX}"
+AWK="awk"
+GREP="grep"
+
+command -v ${AWK} >/dev/null 2>&1 || die "${AWK} isn't installed"
+command -v ${READELF} >/dev/null 2>&1 || die "${READELF} isn't installed"
+command -v ${ADDR2LINE} >/dev/null 2>&1 || die "${ADDR2LINE} isn't installed"
+
# Try to figure out the source directory prefix so we can remove it from the
# addr2line output. HACK ALERT: This assumes that start_kernel() is in
# init/main.c! This only works for vmlinux. Otherwise it falls back to
# printing the absolute path.
find_dir_prefix() {
- local objfile=$1
-
- local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
+ local start_kernel_addr=$(echo "${ELF_SYMS}" | sed 's/\[.*\]//' |
+ ${AWK} '$8 == "start_kernel" {printf "0x%s", $2}')
[[ -z $start_kernel_addr ]] && return
- local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)
- [[ -z $file_line ]] && return
+ run_addr2line ${start_kernel_addr} ""
+ [[ -z $ADDR2LINE_OUT ]] && return
+ local file_line=${ADDR2LINE_OUT#* at }
+ if [[ -z $file_line ]] || [[ $file_line = $ADDR2LINE_OUT ]]; then
+ return
+ fi
local prefix=${file_line%init/main.c:*}
if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then
return
@@ -91,92 +105,221 @@ find_dir_prefix() {
return 0
}
+run_readelf() {
+ local objfile=$1
+ local out=$(${READELF} --file-header --section-headers --symbols --wide $objfile)
+
+ # This assumes that readelf first prints the file header, then the section headers, then the symbols.
+ # Note: It seems that GNU readelf does not prefix section headers with the "There are X section headers"
+ # line when multiple options are given, so let's also match with the "Section Headers:" line.
+ ELF_FILEHEADER=$(echo "${out}" | sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/q;p')
+ ELF_SECHEADERS=$(echo "${out}" | sed -n '/There are [0-9]* section headers, starting at offset\|Section Headers:/,$p' | sed -n '/Symbol table .* contains [0-9]* entries:/q;p')
+ ELF_SYMS=$(echo "${out}" | sed -n '/Symbol table .* contains [0-9]* entries:/,$p')
+}
+
+check_vmlinux() {
+ # vmlinux uses absolute addresses in the section table rather than
+ # section offsets.
+ IS_VMLINUX=0
+ local file_type=$(echo "${ELF_FILEHEADER}" |
+ ${AWK} '$1 == "Type:" { print $2; exit }')
+ if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then
+ IS_VMLINUX=1
+ fi
+}
+
+init_addr2line() {
+ local objfile=$1
+
+ check_vmlinux
+
+ ADDR2LINE_ARGS="--functions --pretty-print --inlines --addresses --exe=$objfile"
+ if [[ $IS_VMLINUX = 1 ]]; then
+ # If the executable file is vmlinux, we don't pass section names to
+ # addr2line, so we can launch it now as a single long-running process.
+ coproc ADDR2LINE_PROC (${ADDR2LINE} ${ADDR2LINE_ARGS})
+ fi
+}
+
+run_addr2line() {
+ local addr=$1
+ local sec_name=$2
+
+ if [[ $IS_VMLINUX = 1 ]]; then
+ # We send to the addr2line process: (1) the address, then (2) a sentinel
+ # value, i.e., something that can't be interpreted as a valid address
+ # (i.e., ","). This causes addr2line to write out: (1) the answer for
+ # our address, then (2) either "?? ??:0" or "0x0...0: ..." (if
+ # using binutils' addr2line), or "," (if using LLVM's addr2line).
+ echo ${addr} >& "${ADDR2LINE_PROC[1]}"
+ echo "," >& "${ADDR2LINE_PROC[1]}"
+ local first_line
+ read -r first_line <& "${ADDR2LINE_PROC[0]}"
+ ADDR2LINE_OUT=$(echo "${first_line}" | sed 's/^0x[0-9a-fA-F]*: //')
+ while read -r line <& "${ADDR2LINE_PROC[0]}"; do
+ if [[ "$line" == "?? ??:0" ]] || [[ "$line" == "," ]] || [[ $(echo "$line" | ${GREP} "^0x00*: ") ]]; then
+ break
+ fi
+ ADDR2LINE_OUT+=$'\n'$(echo "$line" | sed 's/^0x[0-9a-fA-F]*: //')
+ done
+ else
+ # Run addr2line as a single invocation.
+ local sec_arg
+ [[ -z $sec_name ]] && sec_arg="" || sec_arg="--section=${sec_name}"
+ ADDR2LINE_OUT=$(${ADDR2LINE} ${ADDR2LINE_ARGS} ${sec_arg} ${addr} | sed 's/^0x[0-9a-fA-F]*: //')
+ fi
+}
+
__faddr2line() {
local objfile=$1
local func_addr=$2
local dir_prefix=$3
local print_warnings=$4
- local func=${func_addr%+*}
- local offset=${func_addr#*+}
- offset=${offset%/*}
- local size=
- [[ $func_addr =~ "/" ]] && size=${func_addr#*/}
+ local sym_name=${func_addr%+*}
+ local func_offset=${func_addr#*+}
+ func_offset=${func_offset%/*}
+ local user_size=
+ [[ $func_addr =~ "/" ]] && user_size=${func_addr#*/}
- if [[ -z $func ]] || [[ -z $offset ]] || [[ $func = $func_addr ]]; then
+ if [[ -z $sym_name ]] || [[ -z $func_offset ]] || [[ $sym_name = $func_addr ]]; then
warn "bad func+offset $func_addr"
DONE=1
return
fi
# Go through each of the object's symbols which match the func name.
- # In rare cases there might be duplicates.
- file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}')
- while read symbol; do
- local fields=($symbol)
- local sym_base=0x${fields[0]}
- local sym_type=${fields[1]}
- local sym_end=${fields[3]}
-
- # calculate the size
- local sym_size=$(($sym_end - $sym_base))
+ # In rare cases there might be duplicates, in which case we print all
+ # matches.
+ while read line; do
+ local fields=($line)
+ local sym_addr=0x${fields[1]}
+ local sym_elf_size=${fields[2]}
+ local sym_sec=${fields[6]}
+ local sec_size
+ local sec_name
+
+ # Get the section size:
+ sec_size=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |
+ ${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }')
+
+ if [[ -z $sec_size ]]; then
+ warn "bad section size: section: $sym_sec"
+ DONE=1
+ return
+ fi
+
+ # Get the section name:
+ sec_name=$(echo "${ELF_SECHEADERS}" | sed 's/\[ /\[/' |
+ ${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print $2; exit }')
+
+ if [[ -z $sec_name ]]; then
+ warn "bad section name: section: $sym_sec"
+ DONE=1
+ return
+ fi
+
+ # Calculate the symbol size.
+ #
+ # Unfortunately we can't use the ELF size, because kallsyms
+ # also includes the padding bytes in its size calculation. For
+ # kallsyms, the size calculation is the distance between the
+ # symbol and the next symbol in a sorted list.
+ local sym_size
+ local cur_sym_addr
+ local found=0
+ while read line; do
+ local fields=($line)
+ cur_sym_addr=0x${fields[1]}
+ local cur_sym_elf_size=${fields[2]}
+ local cur_sym_name=${fields[7]:-}
+
+ # is_mapping_symbol(cur_sym_name)
+ if [[ ${cur_sym_name} =~ ^(\.L|L0|\$) ]]; then
+ continue
+ fi
+
+ if [[ $cur_sym_addr = $sym_addr ]] &&
+ [[ $cur_sym_elf_size = $sym_elf_size ]] &&
+ [[ $cur_sym_name = $sym_name ]]; then
+ found=1
+ continue
+ fi
+
+ if [[ $found = 1 ]]; then
+ sym_size=$(($cur_sym_addr - $sym_addr))
+ [[ $sym_size -lt $sym_elf_size ]] && continue;
+ found=2
+ break
+ fi
+ done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v sec=$sym_sec '$7 == sec' | sort --key=2)
+
+ if [[ $found = 0 ]]; then
+ warn "can't find symbol: sym_name: $sym_name sym_sec: $sym_sec sym_addr: $sym_addr sym_elf_size: $sym_elf_size"
+ DONE=1
+ return
+ fi
+
+ # If nothing was found after the symbol, assume it's the last
+ # symbol in the section.
+ [[ $found = 1 ]] && sym_size=$(($sec_size - $sym_addr))
+
if [[ -z $sym_size ]] || [[ $sym_size -le 0 ]]; then
- warn "bad symbol size: base: $sym_base end: $sym_end"
+ warn "bad symbol size: sym_addr: $sym_addr cur_sym_addr: $cur_sym_addr"
DONE=1
return
fi
+
sym_size=0x$(printf %x $sym_size)
- # calculate the address
- local addr=$(($sym_base + $offset))
+ # Calculate the address from user-supplied offset:
+ local addr=$(($sym_addr + $func_offset))
if [[ -z $addr ]] || [[ $addr = 0 ]]; then
- warn "bad address: $sym_base + $offset"
+ warn "bad address: $sym_addr + $func_offset"
DONE=1
return
fi
addr=0x$(printf %x $addr)
- # weed out non-function symbols
- if [[ $sym_type != t ]] && [[ $sym_type != T ]]; then
- [[ $print_warnings = 1 ]] &&
- echo "skipping $func address at $addr due to non-function symbol of type '$sym_type'"
- continue
- fi
-
- # if the user provided a size, make sure it matches the symbol's size
- if [[ -n $size ]] && [[ $size -ne $sym_size ]]; then
+ # If the user provided a size, make sure it matches the symbol's size:
+ if [[ -n $user_size ]] && [[ $user_size -ne $sym_size ]]; then
[[ $print_warnings = 1 ]] &&
- echo "skipping $func address at $addr due to size mismatch ($size != $sym_size)"
+ echo "skipping $sym_name address at $addr due to size mismatch ($user_size != $sym_size)"
continue;
fi
- # make sure the provided offset is within the symbol's range
- if [[ $offset -gt $sym_size ]]; then
+ # Make sure the provided offset is within the symbol's range:
+ if [[ $func_offset -gt $sym_size ]]; then
[[ $print_warnings = 1 ]] &&
- echo "skipping $func address at $addr due to size mismatch ($offset > $sym_size)"
+ echo "skipping $sym_name address at $addr due to size mismatch ($func_offset > $sym_size)"
continue
fi
- # separate multiple entries with a blank line
+ # In case of duplicates or multiple addresses specified on the
+ # cmdline, separate multiple entries with a blank line:
[[ $FIRST = 0 ]] && echo
FIRST=0
- # pass real address to addr2line
- echo "$func+$offset/$sym_size:"
- local file_lines=$(${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;")
- [[ -z $file_lines ]] && return
+ echo "$sym_name+$func_offset/$sym_size:"
+ # Pass section address to addr2line and strip absolute paths
+ # from the output:
+ run_addr2line $addr $sec_name
+ local output=$(echo "${ADDR2LINE_OUT}" | sed "s; $dir_prefix\(\./\)*; ;")
+ [[ -z $output ]] && continue
+
+ # Default output (non --list):
if [[ $LIST = 0 ]]; then
- echo "$file_lines" | while read -r line
+ echo "$output" | while read -r line
do
echo $line
done
DONE=1;
- return
+ continue
fi
- # show each line with context
- echo "$file_lines" | while read -r line
+ # For --list, show each line with its corresponding source code:
+ echo "$output" | while read -r line
do
echo
echo $line
@@ -184,12 +327,12 @@ __faddr2line() {
n1=$[$n-5]
n2=$[$n+5]
f=$(echo $line | sed 's/.*at \(.\+\):.*/\1/g')
- awk 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f
+ ${AWK} 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f
done
DONE=1
- done < <(${NM} -n $objfile | awk -v fn=$func -v end=$file_end '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, "0x"$1 } END {if (found == 1) print line, end; }')
+ done < <(echo "${ELF_SYMS}" | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')
}
[[ $# -lt 2 ]] && usage
@@ -202,8 +345,14 @@ LIST=0
[[ ! -f $objfile ]] && die "can't find objfile $objfile"
shift
+run_readelf $objfile
+
+echo "${ELF_SECHEADERS}" | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled"
+
+init_addr2line $objfile
+
DIR_PREFIX=supercalifragilisticexpialidocious
-find_dir_prefix $objfile
+find_dir_prefix
FIRST=1
while [[ $# -gt 0 ]]; do
generated by cgit (git 2.34.1) at 2025-07-25 18:58:55 +0000