linux-kernel - [PATCH AUTOSEL for 4.14 076/100] scripts/faddr2line: extend usage on generic arch

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Message-ID: <20180124041414.32065-76-alexander.levin@microsoft.com>
Date:   Wed, 24 Jan 2018 04:15:04 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     "Liu, Changcheng" <changcheng.liu@...el.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        NeilBrown <neilb@...e.com>, Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 076/100] scripts/faddr2line: extend usage on
 generic arch

From: "Liu, Changcheng" <changcheng.liu@...el.com>

[ Upstream commit 95a87982541932503d3f59aba4c30b0bde0a6294 ]

When cross-compiling, fadd2line should use the binary tool used for the
target system, rather than that of the host.

Link: http://lkml.kernel.org/r/20171121092911.GA150711@sofia
Signed-off-by: Liu Changcheng <changcheng.liu@...el.com>
Cc: Kate Stewart <kstewart@...uxfoundation.org>
Cc: NeilBrown <neilb@...e.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 scripts/faddr2line | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/scripts/faddr2line b/scripts/faddr2line
index 1f5ce959f596..39e07d8574dd 100755
--- a/scripts/faddr2line
+++ b/scripts/faddr2line
@@ -44,9 +44,16 @@
 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 ${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 <object file> <func+offset> <func+offset>..." >&2
@@ -69,10 +76,10 @@ die() {
 find_dir_prefix() {
 	local objfile=$1
 
-	local start_kernel_addr=$(readelf -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
+	local start_kernel_addr=$(${READELF} -sW $objfile | awk '$8 == "start_kernel" {printf "0x%s", $2}')
 	[[ -z $start_kernel_addr ]] && return
 
-	local file_line=$(addr2line -e $objfile $start_kernel_addr)
+	local file_line=$(${ADDR2LINE} -e $objfile $start_kernel_addr)
 	[[ -z $file_line ]] && return
 
 	local prefix=${file_line%init/main.c:*}
@@ -104,7 +111,7 @@ __faddr2line() {
 
 	# 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 $2}')
+	file_end=$(${SIZE} -Ax $objfile | awk '$1 == ".text" {print $2}')
 	while read symbol; do
 		local fields=($symbol)
 		local sym_base=0x${fields[0]}
@@ -156,10 +163,10 @@ __faddr2line() {
 
 		# pass real address to addr2line
 		echo "$func+$offset/$sym_size:"
-		addr2line -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;"
+		${ADDR2LINE} -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;"
 		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"$1 } END {if (found == 1) print line, end; }')
+	done < <(${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; }')
 }
 
 [[ $# -lt 2 ]] && usage
-- 
2.11.0