[thirdparty/kernel/linux.git] / scripts / faddr2line

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Translate stack dump function offsets.
#
# addr2line doesn't work with KASLR addresses.  This works similarly to
# addr2line, but instead takes the 'func+0x123' format as input:
#
#   $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568
#   meminfo_proc_show+0x5/0x568:
#   meminfo_proc_show at fs/proc/meminfo.c:27
#
# If the address is part of an inlined function, the full inline call chain is
# printed:
#
#   $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27
#   native_write_msr+0x6/0x27:
#   arch_static_branch at arch/x86/include/asm/msr.h:121
#    (inlined by) static_key_false at include/linux/jump_label.h:125
#    (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125
#
# The function size after the '/' in the input is optional, but recommended.
# It's used to help disambiguate any duplicate symbol names, which can occur
# rarely.  If the size is omitted for a duplicate symbol then it's possible for
# multiple code sites to be printed:
#
#   $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5
#   raw_ioctl+0x5/0x20:
#   raw_ioctl at drivers/char/raw.c:122
#
#   raw_ioctl+0x5/0xb1:
#   raw_ioctl at net/ipv4/raw.c:876
#
# Multiple addresses can be specified on a single command line:
#
#   $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90
#   type_show+0x10/0x2d:
#   type_show at drivers/video/backlight/backlight.c:213
#
#   free_reserved_area+0x90/0x123:
#   free_reserved_area at mm/page_alloc.c:6429 (discriminator 2)


set -o errexit
set -o nounset

usage() {
	echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2
	exit 1
}

warn() {
	echo "$1" >&2
}

die() {
	echo "ERROR: $1" >&2
	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} --symbols --wide $objfile | 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

	local prefix=${file_line%init/main.c:*}
	if [[ -z $prefix ]] || [[ $prefix = $file_line ]]; then
		return
	fi

	DIR_PREFIX=$prefix
	return 0
}

__faddr2line() {
	local objfile=$1
	local func_addr=$2
	local dir_prefix=$3
	local print_warnings=$4

	local sym_name=${func_addr%+*}
	local func_offset=${func_addr#*+}
	func_offset=${func_offset%/*}
	local user_size=
	local file_type
	local is_vmlinux=0
	[[ $func_addr =~ "/" ]] && user_size=${func_addr#*/}

	if [[ -z $sym_name ]] || [[ -z $func_offset ]] || [[ $sym_name = $func_addr ]]; then
		warn "bad func+offset $func_addr"
		DONE=1
		return
	fi

	# vmlinux uses absolute addresses in the section table rather than
	# section offsets.
	local file_type=$(${READELF} --file-header $objfile |
		${AWK} '$1 == "Type:" { print $2; exit }')
	if [[ $file_type = "EXEC" ]] || [[ $file_type == "DYN" ]]; then
		is_vmlinux=1
	fi

	# Go through each of the object's symbols which match the func name.
	# 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=$(${READELF} --section-headers --wide $objfile |
			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=$(${READELF} --section-headers --wide $objfile |
			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 $sym_elf_size ]] && continue;
				found=2
				break
			fi
		done < <(${READELF} --symbols --wide $objfile | 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: sym_addr: $sym_addr cur_sym_addr: $cur_sym_addr"
			DONE=1
			return
		fi

		sym_size=0x$(printf %x $sym_size)

		# Calculate the address from user-supplied offset:
		local addr=$(($sym_addr + $func_offset))
		if [[ -z $addr ]] || [[ $addr = 0 ]]; then
			warn "bad address: $sym_addr + $func_offset"
			DONE=1
			return
		fi
		addr=0x$(printf %x $addr)

		# 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 $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 [[ $func_offset -gt $sym_size ]]; then
			[[ $print_warnings = 1 ]] &&
				echo "skipping $sym_name address at $addr due to size mismatch ($func_offset > $sym_size)"
			continue
		fi

		# In case of duplicates or multiple addresses specified on the
		# cmdline, separate multiple entries with a blank line:
		[[ $FIRST = 0 ]] && echo
		FIRST=0

		echo "$sym_name+$func_offset/$sym_size:"

		# Pass section address to addr2line and strip absolute paths
		# from the output:
		local args="--functions --pretty-print --inlines --exe=$objfile"
		[[ $is_vmlinux = 0 ]] && args="$args --section=$sec_name"
		local output=$(${ADDR2LINE} $args $addr | sed "s; $dir_prefix\(\./\)*; ;")
		[[ -z $output ]] && continue

		# Default output (non --list):
		if [[ $LIST = 0 ]]; then
			echo "$output" | while read -r line
			do
				echo $line
			done
			DONE=1;
			continue
		fi

		# For --list, show each line with its corresponding source code:
		echo "$output" | while read -r line
		do
			echo
			echo $line
			n=$(echo $line | sed 's/.*:\([0-9]\+\).*/\1/g')
			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
		done

		DONE=1

	done < <(${READELF} --symbols --wide $objfile | sed 's/\[.*\]//' | ${AWK} -v fn=$sym_name '$8 == fn')
}

[[ $# -lt 2 ]] && usage

objfile=$1

LIST=0
[[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1

[[ ! -f $objfile ]] && die "can't find objfile $objfile"
shift

${READELF} --section-headers --wide $objfile | ${GREP} -q '\.debug_info' || die "CONFIG_DEBUG_INFO not enabled"

DIR_PREFIX=supercalifragilisticexpialidocious
find_dir_prefix $objfile

FIRST=1
while [[ $# -gt 0 ]]; do
	func_addr=$1
	shift

	# print any matches found
	DONE=0
	__faddr2line $objfile $func_addr $DIR_PREFIX 0

	# if no match was found, print warnings
	if [[ $DONE = 0 ]]; then
		__faddr2line $objfile $func_addr $DIR_PREFIX 1
		warn "no match for $func_addr"
	fi
done
Commit	Line	Data
67326666	1	#!/bin/bash
b2441318	2	# SPDX-License-Identifier: GPL-2.0
67326666 JP	3	#
	4	# Translate stack dump function offsets.
	5	#
	6	# addr2line doesn't work with KASLR addresses. This works similarly to
	7	# addr2line, but instead takes the 'func+0x123' format as input:
	8	#
	9	# $ ./scripts/faddr2line ~/k/vmlinux meminfo_proc_show+0x5/0x568
	10	# meminfo_proc_show+0x5/0x568:
	11	# meminfo_proc_show at fs/proc/meminfo.c:27
	12	#
	13	# If the address is part of an inlined function, the full inline call chain is
	14	# printed:
	15	#
	16	# $ ./scripts/faddr2line ~/k/vmlinux native_write_msr+0x6/0x27
	17	# native_write_msr+0x6/0x27:
	18	# arch_static_branch at arch/x86/include/asm/msr.h:121
	19	# (inlined by) static_key_false at include/linux/jump_label.h:125
	20	# (inlined by) native_write_msr at arch/x86/include/asm/msr.h:125
	21	#
	22	# The function size after the '/' in the input is optional, but recommended.
	23	# It's used to help disambiguate any duplicate symbol names, which can occur
	24	# rarely. If the size is omitted for a duplicate symbol then it's possible for
	25	# multiple code sites to be printed:
	26	#
	27	# $ ./scripts/faddr2line ~/k/vmlinux raw_ioctl+0x5
	28	# raw_ioctl+0x5/0x20:
	29	# raw_ioctl at drivers/char/raw.c:122
	30	#
	31	# raw_ioctl+0x5/0xb1:
	32	# raw_ioctl at net/ipv4/raw.c:876
	33	#
	34	# Multiple addresses can be specified on a single command line:
	35	#
	36	# $ ./scripts/faddr2line ~/k/vmlinux type_show+0x10/45 free_reserved_area+0x90
	37	# type_show+0x10/0x2d:
	38	# type_show at drivers/video/backlight/backlight.c:213
	39	#
	40	# free_reserved_area+0x90/0x123:
	41	# free_reserved_area at mm/page_alloc.c:6429 (discriminator 2)
	42
	43
	44	set -o errexit
	45	set -o nounset
	46
67326666	47	usage() {
689135f0	48	echo "usage: faddr2line [--list] <object file> <func+offset> <func+offset>..." >&2
67326666 JP	49	exit 1
	50	}
	51
	52	warn() {
	53	echo "$1" >&2
	54	}
	55
	56	die() {
	57	echo "ERROR: $1" >&2
	58	exit 1
	59	}
	60
86bf86e1 WD	61	UTIL_SUFFIX=""
	62	if [[ "${LLVM:-}" == "" ]]; then
	63	UTIL_PREFIX=${CROSS_COMPILE:-}
	64	else
	65	UTIL_PREFIX=llvm-
	66
	67	if [[ "${LLVM}" == *"/" ]]; then
	68	UTIL_PREFIX=${LLVM}${UTIL_PREFIX}
	69	elif [[ "${LLVM}" == "-"* ]]; then
	70	UTIL_SUFFIX=${LLVM}
	71	fi
	72	fi
	73
	74	READELF="${UTIL_PREFIX}readelf${UTIL_SUFFIX}"
	75	ADDR2LINE="${UTIL_PREFIX}addr2line${UTIL_SUFFIX}"
1d1a0e7c	76	AWK="awk"
a41a2e2e	77	GREP="grep"
1d1a0e7c JP	78
	79	command -v ${AWK} >/dev/null 2>&1 \|\| die "${AWK} isn't installed"
	80	command -v ${READELF} >/dev/null 2>&1 \|\| die "${READELF} isn't installed"
	81	command -v ${ADDR2LINE} >/dev/null 2>&1 \|\| die "${ADDR2LINE} isn't installed"
	82
67326666 JP	83	# Try to figure out the source directory prefix so we can remove it from the
67326666 JP	84	# addr2line output. HACK ALERT: This assumes that start_kernel() is in
f5f67cc0	85	# init/main.c! This only works for vmlinux. Otherwise it falls back to
67326666 JP	86	# printing the absolute path.
	87	find_dir_prefix() {
	88	local objfile=$1
	89
2d77de15 SD	90	local start_kernel_addr=$(${READELF} --symbols --wide $objfile \| sed 's/\[.*\]//' \|
2d77de15 SD	91	${AWK} '$8 == "start_kernel" {printf "0x%s", $2}')
67326666 JP	92	[[ -z $start_kernel_addr ]] && return
67326666 JP	93
95a87982	94	local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)
67326666 JP	95	[[ -z $file_line ]] && return
	96
	97	local prefix=${file_line%init/main.c:*}
	98	if [[ -z $prefix ]] \|\| [[ $prefix = $file_line ]]; then
	99	return
	100	fi
	101
	102	DIR_PREFIX=$prefix
	103	return 0
	104	}
	105
	106	__faddr2line() {
	107	local objfile=$1
	108	local func_addr=$2
	109	local dir_prefix=$3
	110	local print_warnings=$4
	111
1d1a0e7c	112	local sym_name=${func_addr%+*}
dcea997b JP	113	local func_offset=${func_addr#*+}
dcea997b JP	114	func_offset=${func_offset%/*}
1d1a0e7c	115	local user_size=
dcea997b JP	116	local file_type
dcea997b JP	117	local is_vmlinux=0
1d1a0e7c	118	[[ $func_addr =~ "/" ]] && user_size=${func_addr#*/}
67326666	119
dcea997b	120	if [[ -z $sym_name ]] \|\| [[ -z $func_offset ]] \|\| [[ $sym_name = $func_addr ]]; then
67326666 JP	121	warn "bad func+offset $func_addr"
	122	DONE=1
	123	return
	124	fi
	125
dcea997b JP	126	# vmlinux uses absolute addresses in the section table rather than
	127	# section offsets.
	128	local file_type=$(${READELF} --file-header $objfile \|
	129	${AWK} '$1 == "Type:" { print $2; exit }')
b6a50688 JP	130	if [[ $file_type = "EXEC" ]] \|\| [[ $file_type == "DYN" ]]; then
	131	is_vmlinux=1
	132	fi
dcea997b	133
67326666	134	# Go through each of the object's symbols which match the func name.
1d1a0e7c JP	135	# In rare cases there might be duplicates, in which case we print all
	136	# matches.
	137	while read line; do
	138	local fields=($line)
	139	local sym_addr=0x${fields[1]}
	140	local sym_elf_size=${fields[2]}
	141	local sym_sec=${fields[6]}
dcea997b JP	142	local sec_size
dcea997b JP	143	local sec_name
1d1a0e7c JP	144
1d1a0e7c JP	145	# Get the section size:
dcea997b	146	sec_size=$(${READELF} --section-headers --wide $objfile \|
1d1a0e7c JP	147	sed 's/\[ /\[/' \|
	148	${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print "0x" $6; exit }')
	149
	150	if [[ -z $sec_size ]]; then
	151	warn "bad section size: section: $sym_sec"
	152	DONE=1
	153	return
	154	fi
	155
dcea997b JP	156	# Get the section name:
	157	sec_name=$(${READELF} --section-headers --wide $objfile \|
	158	sed 's/\[ /\[/' \|
	159	${AWK} -v sec=$sym_sec '$1 == "[" sec "]" { print $2; exit }')
	160
	161	if [[ -z $sec_name ]]; then
	162	warn "bad section name: section: $sym_sec"
	163	DONE=1
	164	return
	165	fi
	166
1d1a0e7c JP	167	# Calculate the symbol size.
	168	#
	169	# Unfortunately we can't use the ELF size, because kallsyms
	170	# also includes the padding bytes in its size calculation. For
	171	# kallsyms, the size calculation is the distance between the
	172	# symbol and the next symbol in a sorted list.
	173	local sym_size
	174	local cur_sym_addr
	175	local found=0
	176	while read line; do
	177	local fields=($line)
	178	cur_sym_addr=0x${fields[1]}
	179	local cur_sym_elf_size=${fields[2]}
	180	local cur_sym_name=${fields[7]:-}
	181
60fd39af WD	182	# is_mapping_symbol(cur_sym_name)
	183	if [[ ${cur_sym_name} =~ ^(\.L\|L0\|\$) ]]; then
	184	continue
	185	fi
	186
1d1a0e7c JP	187	if [[ $cur_sym_addr = $sym_addr ]] &&
	188	[[ $cur_sym_elf_size = $sym_elf_size ]] &&
	189	[[ $cur_sym_name = $sym_name ]]; then
	190	found=1
	191	continue
	192	fi
	193
	194	if [[ $found = 1 ]]; then
	195	sym_size=$(($cur_sym_addr - $sym_addr))
	196	[[ $sym_size -lt $sym_elf_size ]] && continue;
	197	found=2
	198	break
	199	fi
2d77de15	200	done < <(${READELF} --symbols --wide $objfile \| sed 's/\[.*\]//' \| ${AWK} -v sec=$sym_sec '$7 == sec' \| sort --key=2)
1d1a0e7c JP	201
	202	if [[ $found = 0 ]]; then
	203	warn "can't find symbol: sym_name: $sym_name sym_sec: $sym_sec sym_addr: $sym_addr sym_elf_size: $sym_elf_size"
	204	DONE=1
	205	return
	206	fi
	207
	208	# If nothing was found after the symbol, assume it's the last
	209	# symbol in the section.
	210	[[ $found = 1 ]] && sym_size=$(($sec_size - $sym_addr))
	211
efdb4167	212	if [[ -z $sym_size ]] \|\| [[ $sym_size -le 0 ]]; then
1d1a0e7c	213	warn "bad symbol size: sym_addr: $sym_addr cur_sym_addr: $cur_sym_addr"
efdb4167 JP	214	DONE=1
	215	return
	216	fi
1d1a0e7c	217
efdb4167	218	sym_size=0x$(printf %x $sym_size)
67326666	219
dcea997b JP	220	# Calculate the address from user-supplied offset:
dcea997b JP	221	local addr=$(($sym_addr + $func_offset))
67326666	222	if [[ -z $addr ]] \|\| [[ $addr = 0 ]]; then
dcea997b	223	warn "bad address: $sym_addr + $func_offset"
67326666 JP	224	DONE=1
	225	return
	226	fi
efdb4167	227	addr=0x$(printf %x $addr)
67326666	228
1d1a0e7c JP	229	# If the user provided a size, make sure it matches the symbol's size:
1d1a0e7c JP	230	if [[ -n $user_size ]] && [[ $user_size -ne $sym_size ]]; then
67326666	231	[[ $print_warnings = 1 ]] &&
1d1a0e7c	232	echo "skipping $sym_name address at $addr due to size mismatch ($user_size != $sym_size)"
67326666 JP	233	continue;
	234	fi
	235
1d1a0e7c	236	# Make sure the provided offset is within the symbol's range:
dcea997b	237	if [[ $func_offset -gt $sym_size ]]; then
67326666	238	[[ $print_warnings = 1 ]] &&
dcea997b	239	echo "skipping $sym_name address at $addr due to size mismatch ($func_offset > $sym_size)"
67326666 JP	240	continue
	241	fi
	242
1d1a0e7c JP	243	# In case of duplicates or multiple addresses specified on the
1d1a0e7c JP	244	# cmdline, separate multiple entries with a blank line:
67326666 JP	245	[[ $FIRST = 0 ]] && echo
	246	FIRST=0
	247
dcea997b	248	echo "$sym_name+$func_offset/$sym_size:"
6870c016	249
1d1a0e7c JP	250	# Pass section address to addr2line and strip absolute paths
1d1a0e7c JP	251	# from the output:
dcea997b JP	252	local args="--functions --pretty-print --inlines --exe=$objfile"
	253	[[ $is_vmlinux = 0 ]] && args="$args --section=$sec_name"
	254	local output=$(${ADDR2LINE} $args $addr \| sed "s; $dir_prefix\(\./\)*; ;")
1d1a0e7c JP	255	[[ -z $output ]] && continue
	256
	257	# Default output (non --list):
689135f0	258	if [[ $LIST = 0 ]]; then
1d1a0e7c	259	echo "$output" \| while read -r line
689135f0 PZI	260	do
	261	echo $line
	262	done
	263	DONE=1;
1d1a0e7c	264	continue
689135f0 PZI	265	fi
689135f0 PZI	266
1d1a0e7c JP	267	# For --list, show each line with its corresponding source code:
1d1a0e7c JP	268	echo "$output" \| while read -r line
6870c016	269	do
689135f0	270	echo
6870c016	271	echo $line
78eb0c63 CD	272	n=$(echo $line \| sed 's/.:\([0-9]\+\)./\1/g')
	273	n1=$[$n-5]
	274	n2=$[$n+5]
	275	f=$(echo $line \| sed 's/.at \(.\+\):./\1/g')
1d1a0e7c	276	${AWK} 'NR>=strtonum("'$n1'") && NR<=strtonum("'$n2'") { if (NR=='$n') printf(">%d<", NR); else printf(" %d ", NR); printf("\t%s\n", $0)}' $f
6870c016 CD	277	done
6870c016 CD	278
67326666 JP	279	DONE=1
67326666 JP	280
180af1a5	281	done < <(${READELF} --symbols --wide $objfile \| sed 's/\[.*\]//' \| ${AWK} -v fn=$sym_name '$8 == fn')
67326666 JP	282	}
	283
	284	[[ $# -lt 2 ]] && usage
	285
	286	objfile=$1
689135f0 PZI	287
	288	LIST=0
	289	[[ "$objfile" == "--list" ]] && LIST=1 && shift && objfile=$1
	290
67326666 JP	291	[[ ! -f $objfile ]] && die "can't find objfile $objfile"
	292	shift
	293
a41a2e2e JP	294	${READELF} --section-headers --wide $objfile \| ${GREP} -q '\.debug_info' \|\| die "CONFIG_DEBUG_INFO not enabled"
a41a2e2e JP	295
67326666 JP	296	DIR_PREFIX=supercalifragilisticexpialidocious
	297	find_dir_prefix $objfile
	298
	299	FIRST=1
	300	while [[ $# -gt 0 ]]; do
	301	func_addr=$1
	302	shift
	303
	304	# print any matches found
	305	DONE=0
	306	__faddr2line $objfile $func_addr $DIR_PREFIX 0
	307
	308	# if no match was found, print warnings
	309	if [[ $DONE = 0 ]]; then
	310	__faddr2line $objfile $func_addr $DIR_PREFIX 1
	311	warn "no match for $func_addr"
	312	fi
	313	done