mirror of
https://github.com/torvalds/linux.git
synced 2025-10-31 08:38:45 +02:00
1bfaa37fd3
Commit 0f71dcfb4a ("powerpc/ftrace: Add support for
-fpatchable-function-entry") added a script to check for
-fpatchable-function-entry compiler support. The script expects compiler
to emit the section __patchable_function_entries and few nops after a
function entry.
If the compiler understands and emits the above,
CONFIG_ARCH_USING_PATCHABLE_FUNCTION_ENTRY is set.
So teach dummy-tools' gcc about this.
Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
116 lines
3.3 KiB
Bash
Executable file
116 lines
3.3 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;}; s/__LONG_DOUBLE_128__/1/ 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 "$@" && arg_contain -mprofile-kernel "$@"; then
|
|
if ! test -t 0 && ! grep -q notrace; then
|
|
echo "_mcount"
|
|
fi
|
|
exit 0
|
|
fi
|
|
|
|
# For arch/powerpc/tools/gcc-check-fpatchable-function-entry.sh
|
|
if arg_contain -m64 "$@" && arg_contain -fpatchable-function-entry=2 "$@"; then
|
|
echo "func:"
|
|
echo ".section __patchable_function_entries"
|
|
echo ".localentry"
|
|
echo " nop"
|
|
echo " nop"
|
|
exit 0
|
|
fi
|
|
fi
|
|
|
|
# To set GCC_PLUGINS
|
|
if arg_contain -print-file-name=plugin "$@"; then
|
|
# Use $0 to find the in-tree dummy directory
|
|
echo "$(dirname "$(readlink -f "$0")")/dummy-plugin-dir"
|
|
exit 0
|
|
fi
|
|
|
|
# inverted return value
|
|
if arg_contain -D__SIZEOF_INT128__=0 "$@"; then
|
|
exit 1
|
|
fi
|