scripts: fix faddr2line to work on last symbol

If faddr2line is given a function name which is the last one listed by
"nm -n", it will fail because it never finds the next symbol.

So teach the awk script to catch that possibility, and use 'size' to
provide the end point of the last function.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/faddr2line b/scripts/faddr2line
index 29df825..2f6ce80 100755 (executable)
--- a/scripts/faddr2line
+++ b/scripts/faddr2line
@@ -103,11 +103,12 @@ __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 $2}')
        while read symbol; do
                local fields=($symbol)
                local sym_base=0x${fields[0]}
                local sym_type=${fields[1]}
-               local sym_end=0x${fields[3]}
+               local sym_end=${fields[3]}
 
                # calculate the size
                local sym_size=$(($sym_end - $sym_base))
@@ -157,7 +158,7 @@ __faddr2line() {
                addr2line -fpie $objfile $addr | sed "s; $dir_prefix\(\./\)*; ;"
                DONE=1
 
-       done < <(nm -n $objfile | awk -v fn=$func '$3 == fn { found=1; line=$0; start=$1; next } found == 1 { found=0; print line, $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; }')
 }
 
 [[ $# -lt 2 ]] && usage