scripts/faddr2line: extend usage on generic arch

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@intel.com>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: NeilBrown <neilb@suse.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/faddr2line b/scripts/faddr2line
index 1f5ce959f5965b0249f70786e44f472581625955..39e07d8574dd787c2af71937852156abb9b1a7fb 100755 (executable)
--- 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