mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-24 20:54:10 +08:00
c93db682cf
Commit3fb0fdb3bb("x86/stackprotector/32: Make the canary into a regular percpu variable") modified the stackprotector check on 32-bit x86 to check if gcc supports using %fs as canary. Adjust dummy-tools gcc script to pass this new test by returning "%fs" rather than "%gs" if it detects -mstack-protector-guard-reg=fs on command line. Fixes:3fb0fdb3bb("x86/stackprotector/32: Make the canary into a regular percpu variable") Signed-off-by: Michal Kubecek <mkubecek@suse.cz> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
112 lines
3.0 KiB
Bash
Executable File
112 lines
3.0 KiB
Bash
Executable File
#!/bin/sh
|
|
# SPDX-License-Identifier: GPL-2.0-only
|
|
#
|
|
# Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG
|
|
# options your compiler does not support. This works well if you configure and
|
|
# build the kernel on the same host machine.
|
|
#
|
|
# It is inconvenient if you prepare the .config that is carried to a different
|
|
# build environment (typically this happens when you package the kernel for
|
|
# distros) because using a different compiler potentially produces different
|
|
# CONFIG options than the real build environment. So, you probably want to make
|
|
# as many options visible as possible. In other words, you need to create a
|
|
# super-set of CONFIG options that cover any build environment. If some of the
|
|
# CONFIG options turned out to be unsupported on the build machine, they are
|
|
# automatically disabled by the nature of Kconfig.
|
|
#
|
|
# However, it is not feasible to get a full-featured compiler for every arch.
|
|
# Hence these dummy toolchains to make all compiler tests pass.
|
|
#
|
|
# Usage:
|
|
#
|
|
# From the top directory of the source tree, run
|
|
#
|
|
# $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig
|
|
#
|
|
# Most of compiler features are tested by cc-option, which simply checks the
|
|
# exit code of $(CC). This script does nothing and just exits with 0 in most
|
|
# cases. So, $(cc-option, ...) is evaluated as 'y'.
|
|
#
|
|
# This scripts caters to more checks; handle --version and pre-process __GNUC__
|
|
# etc. to pretend to be GCC, and also do right things to satisfy some scripts.
|
|
|
|
# Check if the first parameter appears in the rest. Succeeds if found.
|
|
# This helper is useful if a particular option was passed to this script.
|
|
# Typically used like this:
|
|
# arg_contain <word-you-are-searching-for> "$@"
|
|
arg_contain ()
|
|
{
|
|
search="$1"
|
|
shift
|
|
|
|
while [ $# -gt 0 ]
|
|
do
|
|
if [ "$search" = "$1" ]; then
|
|
return 0
|
|
fi
|
|
shift
|
|
done
|
|
|
|
return 1
|
|
}
|
|
|
|
# To set CONFIG_CC_IS_GCC=y
|
|
if arg_contain --version "$@"; then
|
|
echo "gcc (scripts/dummy-tools/gcc)"
|
|
exit 0
|
|
fi
|
|
|
|
if arg_contain -E "$@"; then
|
|
# For scripts/cc-version.sh; This emulates GCC 20.0.0
|
|
if arg_contain - "$@"; then
|
|
sed -n '/^GCC/{s/__GNUC__/20/; s/__GNUC_MINOR__/0/; s/__GNUC_PATCHLEVEL__/0/; p;}'
|
|
exit 0
|
|
else
|
|
echo "no input files" >&2
|
|
exit 1
|
|
fi
|
|
fi
|
|
|
|
# To set CONFIG_AS_IS_GNU
|
|
if arg_contain -Wa,--version "$@"; then
|
|
echo "GNU assembler (scripts/dummy-tools) 2.50"
|
|
exit 0
|
|
fi
|
|
|
|
if arg_contain -S "$@"; then
|
|
# For scripts/gcc-x86-*-has-stack-protector.sh
|
|
if arg_contain -fstack-protector "$@"; then
|
|
if arg_contain -mstack-protector-guard-reg=fs "$@"; then
|
|
echo "%fs"
|
|
else
|
|
echo "%gs"
|
|
fi
|
|
exit 0
|
|
fi
|
|
|
|
# For arch/powerpc/tools/gcc-check-mprofile-kernel.sh
|
|
if arg_contain -m64 "$@" && arg_contain -mlittle-endian "$@" &&
|
|
arg_contain -mprofile-kernel "$@"; then
|
|
if ! test -t 0 && ! grep -q notrace; then
|
|
echo "_mcount"
|
|
fi
|
|
exit 0
|
|
fi
|
|
fi
|
|
|
|
# To set GCC_PLUGINS
|
|
if arg_contain -print-file-name=plugin "$@"; then
|
|
plugin_dir=$(mktemp -d)
|
|
|
|
mkdir -p $plugin_dir/include
|
|
touch $plugin_dir/include/plugin-version.h
|
|
|
|
echo $plugin_dir
|
|
exit 0
|
|
fi
|
|
|
|
# inverted return value
|
|
if arg_contain -D__SIZEOF_INT128__=0 "$@"; then
|
|
exit 1
|
|
fi
|