gcc-check-fpatchable-function-entry.sh

 1#!/bin/bash
 2# SPDX-License-Identifier: GPL-2.0
 3
 4set -e
 5
 6# To debug, uncomment the following line
 7# set -x
 8
 9# Output from -fpatchable-function-entry can only vary on ppc64 elfv2, so this
10# should not be invoked for other targets. Therefore we can pass in -m64 and
11# -mabi explicitly, to take care of toolchains defaulting to other targets.
12
13# Test whether the compile option -fpatchable-function-entry exists and
14# generates appropriate code
15echo "int func() { return 0; }" | \
16    $* -m64 -mabi=elfv2 -S -x c -O2 -fpatchable-function-entry=2 - -o - 2> /dev/null | \
17    grep -q "__patchable_function_entries"
18
19# Test whether nops are generated after the local entry point
20echo "int x; int func() { return x; }" | \
21    $* -m64 -mabi=elfv2 -S -x c -O2 -fpatchable-function-entry=2 - -o - 2> /dev/null | \
22    awk 'BEGIN { RS = ";" } /\.localentry.*nop.*\n[[:space:]]*nop/ { print $0 }' | \
23    grep -q "func:"
24
25exit 0