mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 17:08:10 +00:00
469169803d
Some instructions are only available on the 64-bit architecture.
Bi-arch compilers that default to -m32 need the explicit -m64 option
to evaluate them properly.
Fixes: 18e66b695e ("x86/shstk: Add Kconfig option for shadow stack")
Closes: https://lore.kernel.org/all/20240612-as-instr-opt-wrussq-v2-1-bd950f7eead7@gmail.com/
Reported-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Dmitry Safonov <0x7f454c46@gmail.com>
Link: https://lore.kernel.org/r/20240612050257.3670768-1-masahiroy@kernel.org
66 lines
2.6 KiB
Text
66 lines
2.6 KiB
Text
# SPDX-License-Identifier: GPL-2.0-only
|
|
# Kconfig helper macros
|
|
|
|
# Convenient variables
|
|
comma := ,
|
|
quote := "
|
|
squote := '
|
|
empty :=
|
|
space := $(empty) $(empty)
|
|
dollar := $
|
|
right_paren := )
|
|
left_paren := (
|
|
|
|
# $(if-success,<command>,<then>,<else>)
|
|
# Return <then> if <command> exits with 0, <else> otherwise.
|
|
if-success = $(shell,{ $(1); } >/dev/null 2>&1 && echo "$(2)" || echo "$(3)")
|
|
|
|
# $(success,<command>)
|
|
# Return y if <command> exits with 0, n otherwise
|
|
success = $(if-success,$(1),y,n)
|
|
|
|
# $(failure,<command>)
|
|
# Return n if <command> exits with 0, y otherwise
|
|
failure = $(if-success,$(1),n,y)
|
|
|
|
# $(cc-option,<flag>)
|
|
# Return y if the compiler supports <flag>, n otherwise
|
|
cc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(CC) -Werror $(CLANG_FLAGS) $(1) -c -x c /dev/null -o .tmp_$$/tmp.o)
|
|
|
|
# $(ld-option,<flag>)
|
|
# Return y if the linker supports <flag>, n otherwise
|
|
ld-option = $(success,$(LD) -v $(1))
|
|
|
|
# $(as-instr,<instr>)
|
|
# Return y if the assembler supports <instr>, n otherwise
|
|
as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) $(2) -Wa$(comma)--fatal-warnings -c -x assembler-with-cpp -o /dev/null -)
|
|
as-instr64 = $(as-instr,$(1),$(m64-flag))
|
|
|
|
# check if $(CC) and $(LD) exist
|
|
$(error-if,$(failure,command -v $(CC)),C compiler '$(CC)' not found)
|
|
$(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found)
|
|
|
|
# Get the C compiler name, version, and error out if it is not supported.
|
|
cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC))
|
|
$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this C compiler is not supported.)
|
|
cc-name := $(shell,set -- $(cc-info) && echo $1)
|
|
cc-version := $(shell,set -- $(cc-info) && echo $2)
|
|
|
|
# Get the assembler name, version, and error out if it is not supported.
|
|
as-info := $(shell,$(srctree)/scripts/as-version.sh $(CC) $(CLANG_FLAGS))
|
|
$(error-if,$(success,test -z "$(as-info)"),Sorry$(comma) this assembler is not supported.)
|
|
as-name := $(shell,set -- $(as-info) && echo $1)
|
|
as-version := $(shell,set -- $(as-info) && echo $2)
|
|
|
|
# Get the linker name, version, and error out if it is not supported.
|
|
ld-info := $(shell,$(srctree)/scripts/ld-version.sh $(LD))
|
|
$(error-if,$(success,test -z "$(ld-info)"),Sorry$(comma) this linker is not supported.)
|
|
ld-name := $(shell,set -- $(ld-info) && echo $1)
|
|
ld-version := $(shell,set -- $(ld-info) && echo $2)
|
|
|
|
# machine bit flags
|
|
# $(m32-flag): -m32 if the compiler supports it, or an empty string otherwise.
|
|
# $(m64-flag): -m64 if the compiler supports it, or an empty string otherwise.
|
|
cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$(1))
|
|
m32-flag := $(cc-option-bit,-m32)
|
|
m64-flag := $(cc-option-bit,-m64)
|