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linux/tools/testing/selftests/nolibc/Makefile.nolibc
Thomas Weißschuh b9e5036317 selftests/nolibc: add x32 test configuration 
Nolibc supports the x32 ABI on x86.
Add a testcase to make sure the support stays functional.

QEMU user does not have support for x32, so skip the test there.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Link: https://lore.kernel.org/r/20250712-nolibc-x32-v1-2-6d81cb798710@weissschuh.net
2025-07-13 16:58:41 +02:00

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# SPDX-License-Identifier: GPL-2.0
# Makefile for nolibc tests
# we're in ".../tools/testing/selftests/nolibc"
ifeq ($(srctree),)
srctree := $(patsubst %/tools/testing/selftests/,%,$(dir $(CURDIR)))
endif
include $(srctree)/tools/scripts/utilities.mak
# We need this for the "__cc-option" macro.
include $(srctree)/scripts/Makefile.compiler
ifneq ($(O),)
ifneq ($(call is-absolute,$(O)),y)
$(error Only absolute O= parameters are supported)
endif
objtree := $(O)
else
objtree ?= $(srctree)
endif
ifeq ($(ARCH),)
include $(srctree)/scripts/subarch.include
ARCH = $(SUBARCH)
endif
cc-option = $(call __cc-option, $(CC),$(CLANG_CROSS_FLAGS),$(1),$(2))
# XARCH extends the kernel's ARCH with a few variants of the same
# architecture that only differ by the configuration, the toolchain
# and the Qemu program used. It is copied as-is into ARCH except for
# a few specific values which are mapped like this:
#
# XARCH | ARCH | config
# -------------|-----------|-------------------------
# ppc | powerpc | 32 bits
# ppc64 | powerpc | 64 bits big endian
# ppc64le | powerpc | 64 bits little endian
#
# It is recommended to only use XARCH, though it does not harm if
# ARCH is already set. For simplicity, ARCH is sufficient for all
# architectures where both are equal.
# configure default variants for target kernel supported architectures
XARCH_powerpc = ppc
XARCH_mips = mips32le
XARCH_riscv = riscv64
XARCH = $(or $(XARCH_$(ARCH)),$(ARCH))
# map from user input variants to their kernel supported architectures
ARCH_x32 = x86
ARCH_armthumb = arm
ARCH_ppc = powerpc
ARCH_ppc64 = powerpc
ARCH_ppc64le = powerpc
ARCH_mips32le = mips
ARCH_mips32be = mips
ARCH_mipsn32le = mips
ARCH_mipsn32be = mips
ARCH_mips64le = mips
ARCH_mips64be = mips
ARCH_riscv32 = riscv
ARCH_riscv64 = riscv
ARCH_s390x = s390
ARCH_sparc32 = sparc
ARCH_sparc64 = sparc
ARCH_sh4 = sh
ARCH := $(or $(ARCH_$(XARCH)),$(XARCH))
# kernel image names by architecture
IMAGE_i386 = arch/x86/boot/bzImage
IMAGE_x86_64 = arch/x86/boot/bzImage
IMAGE_x32 = arch/x86/boot/bzImage
IMAGE_x86 = arch/x86/boot/bzImage
IMAGE_arm64 = arch/arm64/boot/Image
IMAGE_arm = arch/arm/boot/zImage
IMAGE_armthumb = arch/arm/boot/zImage
IMAGE_mips32le = vmlinuz
IMAGE_mips32be = vmlinuz
IMAGE_mipsn32le = vmlinuz
IMAGE_mipsn32be = vmlinuz
IMAGE_mips64le = vmlinuz
IMAGE_mips64be = vmlinuz
IMAGE_ppc = vmlinux
IMAGE_ppc64 = vmlinux
IMAGE_ppc64le = arch/powerpc/boot/zImage
IMAGE_riscv = arch/riscv/boot/Image
IMAGE_riscv32 = arch/riscv/boot/Image
IMAGE_riscv64 = arch/riscv/boot/Image
IMAGE_s390x = arch/s390/boot/bzImage
IMAGE_s390 = arch/s390/boot/bzImage
IMAGE_loongarch = arch/loongarch/boot/vmlinuz.efi
IMAGE_sparc32 = arch/sparc/boot/image
IMAGE_sparc64 = arch/sparc/boot/image
IMAGE_m68k = vmlinux
IMAGE_sh4 = arch/sh/boot/zImage
IMAGE = $(objtree)/$(IMAGE_$(XARCH))
IMAGE_NAME = $(notdir $(IMAGE))
# default kernel configurations that appear to be usable
DEFCONFIG_i386 = defconfig
DEFCONFIG_x86_64 = defconfig
DEFCONFIG_x32 = defconfig
DEFCONFIG_x86 = defconfig
DEFCONFIG_arm64 = defconfig
DEFCONFIG_arm = multi_v7_defconfig
DEFCONFIG_armthumb = multi_v7_defconfig
DEFCONFIG_mips32le = malta_defconfig
DEFCONFIG_mips32be = malta_defconfig generic/eb.config
DEFCONFIG_mipsn32le = malta_defconfig generic/64r2.config
DEFCONFIG_mipsn32be = malta_defconfig generic/64r6.config generic/eb.config
DEFCONFIG_mips64le = malta_defconfig generic/64r6.config
DEFCONFIG_mips64be = malta_defconfig generic/64r2.config generic/eb.config
DEFCONFIG_ppc = pmac32_defconfig
DEFCONFIG_ppc64 = powernv_be_defconfig
DEFCONFIG_ppc64le = powernv_defconfig
DEFCONFIG_riscv = defconfig
DEFCONFIG_riscv32 = rv32_defconfig
DEFCONFIG_riscv64 = defconfig
DEFCONFIG_s390x = defconfig
DEFCONFIG_s390 = defconfig compat.config
DEFCONFIG_loongarch = defconfig
DEFCONFIG_sparc32 = sparc32_defconfig
DEFCONFIG_sparc64 = sparc64_defconfig
DEFCONFIG_m68k = virt_defconfig
DEFCONFIG_sh4 = rts7751r2dplus_defconfig
DEFCONFIG = $(DEFCONFIG_$(XARCH))
EXTRACONFIG_x32 = -e CONFIG_X86_X32_ABI
EXTRACONFIG_arm = -e CONFIG_NAMESPACES
EXTRACONFIG_armthumb = -e CONFIG_NAMESPACES
EXTRACONFIG_m68k = -e CONFIG_BLK_DEV_INITRD
EXTRACONFIG_sh4 = -e CONFIG_BLK_DEV_INITRD -e CONFIG_CMDLINE_FROM_BOOTLOADER
EXTRACONFIG = $(EXTRACONFIG_$(XARCH))
# optional tests to run (default = all)
TEST =
# QEMU_ARCH: arch names used by qemu
QEMU_ARCH_i386 = i386
QEMU_ARCH_x86_64 = x86_64
QEMU_ARCH_x32 = x86_64
QEMU_ARCH_x86 = x86_64
QEMU_ARCH_arm64 = aarch64
QEMU_ARCH_arm = arm
QEMU_ARCH_armthumb = arm
QEMU_ARCH_mips32le = mipsel # works with malta_defconfig
QEMU_ARCH_mips32be = mips
QEMU_ARCH_mipsn32le = mips64el
QEMU_ARCH_mipsn32be = mips64
QEMU_ARCH_mips64le = mips64el
QEMU_ARCH_mips64be = mips64
QEMU_ARCH_ppc = ppc
QEMU_ARCH_ppc64 = ppc64
QEMU_ARCH_ppc64le = ppc64
QEMU_ARCH_riscv = riscv64
QEMU_ARCH_riscv32 = riscv32
QEMU_ARCH_riscv64 = riscv64
QEMU_ARCH_s390x = s390x
QEMU_ARCH_s390 = s390x
QEMU_ARCH_loongarch = loongarch64
QEMU_ARCH_sparc32 = sparc
QEMU_ARCH_sparc64 = sparc64
QEMU_ARCH_m68k = m68k
QEMU_ARCH_sh4 = sh4
QEMU_ARCH = $(QEMU_ARCH_$(XARCH))
QEMU_ARCH_USER_ppc64le = ppc64le
QEMU_ARCH_USER_mipsn32le = mipsn32el
QEMU_ARCH_USER_mipsn32be = mipsn32
QEMU_ARCH_USER = $(or $(QEMU_ARCH_USER_$(XARCH)),$(QEMU_ARCH_$(XARCH)))
QEMU_BIOS_DIR = /usr/share/edk2/
QEMU_BIOS_loongarch = $(QEMU_BIOS_DIR)/loongarch64/OVMF_CODE.fd
ifneq ($(QEMU_BIOS_$(XARCH)),)
QEMU_ARGS_BIOS = -bios $(QEMU_BIOS_$(XARCH))
endif
# QEMU_ARGS : some arch-specific args to pass to qemu
QEMU_ARGS_i386 = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_x86_64 = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_x32 = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_x86 = -M pc -append "console=ttyS0,9600 i8042.noaux panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_arm64 = -M virt -cpu cortex-a53 -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_arm = -M virt -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_armthumb = -M virt -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips32le = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips32be = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mipsn32le = -M malta -cpu 5KEc -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mipsn32be = -M malta -cpu I6400 -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips64le = -M malta -cpu I6400 -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_mips64be = -M malta -cpu 5KEc -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_ppc = -M g3beige -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_ppc64 = -M powernv -append "console=hvc0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_ppc64le = -M powernv -append "console=hvc0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_riscv = -M virt -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_riscv32 = -M virt -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_riscv64 = -M virt -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_s390x = -M s390-ccw-virtio -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_s390 = -M s390-ccw-virtio -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_loongarch = -M virt -append "console=ttyS0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_sparc32 = -M SS-5 -m 256M -append "console=ttyS0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_sparc64 = -M sun4u -append "console=ttyS0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_m68k = -M virt -append "console=ttyGF0,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS_sh4 = -M r2d -serial file:/dev/stdout -append "console=ttySC1,115200 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
QEMU_ARGS = -m 1G $(QEMU_ARGS_$(XARCH)) $(QEMU_ARGS_BIOS) $(QEMU_ARGS_EXTRA)
# OUTPUT is only set when run from the main makefile, otherwise
# it defaults to this nolibc directory.
OUTPUT ?= $(CURDIR)/
ifeq ($(V),1)
Q=
else
Q=@
endif
CFLAGS_i386 = $(call cc-option,-m32)
CFLAGS_x32 = -mx32
CFLAGS_arm = -marm
CFLAGS_armthumb = -mthumb -march=armv6t2
CFLAGS_ppc = -m32 -mbig-endian -mno-vsx $(call cc-option,-mmultiple)
CFLAGS_ppc64 = -m64 -mbig-endian -mno-vsx $(call cc-option,-mmultiple)
CFLAGS_ppc64le = -m64 -mlittle-endian -mno-vsx $(call cc-option,-mabi=elfv2)
CFLAGS_s390x = -m64
CFLAGS_s390 = -m31
CFLAGS_mips32le = -EL -mabi=32 -fPIC
CFLAGS_mips32be = -EB -mabi=32
CFLAGS_mipsn32le = -EL -mabi=n32 -fPIC -march=mips64r2
CFLAGS_mipsn32be = -EB -mabi=n32 -march=mips64r6
CFLAGS_mips64le = -EL -mabi=64 -march=mips64r6
CFLAGS_mips64be = -EB -mabi=64 -march=mips64r2
CFLAGS_sparc32 = $(call cc-option,-m32)
CFLAGS_sh4 = -ml -m4
ifeq ($(origin XARCH),command line)
CFLAGS_XARCH = $(CFLAGS_$(XARCH))
endif
include Makefile.include
CFLAGS ?= $(CFLAGS_NOLIBC_TEST) $(CFLAGS_XARCH) $(CFLAGS_EXTRA)
LDFLAGS :=
LIBGCC := -lgcc
ifeq ($(ARCH),x86)
# Not needed on x86, probably not present for x32
LIBGCC :=
endif
ifneq ($(LLVM),)
# Not needed for clang
LIBGCC :=
endif
# Modify CFLAGS based on LLVM=
include $(srctree)/tools/scripts/Makefile.include
REPORT ?= awk '/\[OK\][\r]*$$/{p++} /\[FAIL\][\r]*$$/{if (!f) printf("\n"); f++; print;} /\[SKIPPED\][\r]*$$/{s++} \
/^Total number of errors:/{done++} \
END{ printf("\n%3d test(s): %3d passed, %3d skipped, %3d failed => status: ", p+s+f, p, s, f); \
if (f || !p || !done) printf("failure\n"); else if (s) printf("warning\n"); else printf("success\n");; \
printf("\nSee all results in %s\n", ARGV[1]); }'
help:
@echo "Supported targets under selftests/nolibc:"
@echo " all call the \"run\" target below"
@echo " help this help"
@echo " sysroot create the nolibc sysroot here (uses \$$ARCH)"
@echo " nolibc-test build the executable (uses \$$CC and \$$CROSS_COMPILE)"
@echo " libc-test build an executable using the compiler's default libc instead"
@echo " run-user runs the executable under QEMU (uses \$$XARCH, \$$TEST)"
@echo " initramfs.cpio prepare the initramfs archive with nolibc-test"
@echo " initramfs prepare the initramfs tree with nolibc-test"
@echo " defconfig create a fresh new default config (uses \$$XARCH)"
@echo " kernel (re)build the kernel (uses \$$XARCH)"
@echo " kernel-standalone (re)build the kernel with the initramfs (uses \$$XARCH)"
@echo " run runs the kernel in QEMU after building it (uses \$$XARCH, \$$TEST)"
@echo " rerun runs a previously prebuilt kernel in QEMU (uses \$$XARCH, \$$TEST)"
@echo " clean clean the sysroot, initramfs, build and output files"
@echo ""
@echo "The output file is \"run.out\". Test ranges may be passed using \$$TEST."
@echo ""
@echo "Currently using the following variables:"
@echo " ARCH = $(ARCH)"
@echo " XARCH = $(XARCH)"
@echo " CROSS_COMPILE = $(CROSS_COMPILE)"
@echo " CC = $(CC)"
@echo " OUTPUT = $(OUTPUT)"
@echo " TEST = $(TEST)"
@echo " QEMU_ARCH = $(if $(QEMU_ARCH),$(QEMU_ARCH),UNKNOWN_ARCH) [determined from \$$XARCH]"
@echo " IMAGE_NAME = $(if $(IMAGE_NAME),$(IMAGE_NAME),UNKNOWN_ARCH) [determined from \$$XARCH]"
@echo ""
all: run
sysroot: sysroot/$(ARCH)/include
sysroot/$(ARCH)/include:
$(Q)rm -rf sysroot/$(ARCH) sysroot/sysroot
$(QUIET_MKDIR)mkdir -p sysroot
$(Q)$(MAKE) -C $(srctree) outputmakefile
$(Q)$(MAKE) -C $(srctree)/tools/include/nolibc ARCH=$(ARCH) OUTPUT=$(CURDIR)/sysroot/ headers_standalone headers_check
$(Q)mv sysroot/sysroot sysroot/$(ARCH)
ifneq ($(NOLIBC_SYSROOT),0)
nolibc-test: nolibc-test.c nolibc-test-linkage.c sysroot/$(ARCH)/include
$(QUIET_CC)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ \
-nostdlib -nostdinc -static -Isysroot/$(ARCH)/include nolibc-test.c nolibc-test-linkage.c $(LIBGCC)
else
nolibc-test: nolibc-test.c nolibc-test-linkage.c
$(QUIET_CC)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ \
-nostdlib -static -include $(srctree)/tools/include/nolibc/nolibc.h nolibc-test.c nolibc-test-linkage.c $(LIBGCC)
endif
libc-test: nolibc-test.c nolibc-test-linkage.c
$(QUIET_CC)$(HOSTCC) -o $@ nolibc-test.c nolibc-test-linkage.c
# local libc-test
run-libc-test: libc-test
$(Q)./libc-test > "$(CURDIR)/run.out" || :
$(Q)$(REPORT) $(CURDIR)/run.out
# local nolibc-test
run-nolibc-test: nolibc-test
$(Q)./nolibc-test > "$(CURDIR)/run.out" || :
$(Q)$(REPORT) $(CURDIR)/run.out
# qemu user-land test
run-user: nolibc-test
$(Q)qemu-$(QEMU_ARCH_USER) ./nolibc-test > "$(CURDIR)/run.out" || :
$(Q)$(REPORT) $(CURDIR)/run.out
initramfs.cpio: kernel nolibc-test
$(QUIET_GEN)echo 'file /init nolibc-test 755 0 0' | $(objtree)/usr/gen_init_cpio - > initramfs.cpio
initramfs: nolibc-test
$(QUIET_MKDIR)mkdir -p initramfs
$(call QUIET_INSTALL, initramfs/init)
$(Q)cp nolibc-test initramfs/init
defconfig:
$(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) $(DEFCONFIG)
$(Q)if [ -n "$(EXTRACONFIG)" ]; then \
$(srctree)/scripts/config --file $(objtree)/.config $(EXTRACONFIG); \
$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) olddefconfig < /dev/null; \
fi
kernel:
$(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) $(IMAGE_NAME) < /dev/null
kernel-standalone: initramfs
$(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) $(IMAGE_NAME) CONFIG_INITRAMFS_SOURCE=$(CURDIR)/initramfs < /dev/null
# run the tests after building the kernel
run: kernel initramfs.cpio
$(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(IMAGE)" -initrd initramfs.cpio -serial file:/dev/stdout $(QEMU_ARGS) > "$(CURDIR)/run.out"
$(Q)$(REPORT) $(CURDIR)/run.out
# re-run the tests from an existing kernel
rerun:
$(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(IMAGE)" -initrd initramfs.cpio -serial file:/dev/stdout $(QEMU_ARGS) > "$(CURDIR)/run.out"
$(Q)$(REPORT) $(CURDIR)/run.out
# report with existing test log
report:
$(Q)$(REPORT) $(CURDIR)/run.out
clean:
$(call QUIET_CLEAN, sysroot)
$(Q)rm -rf sysroot
$(call QUIET_CLEAN, nolibc-test)
$(Q)rm -f nolibc-test
$(call QUIET_CLEAN, libc-test)
$(Q)rm -f libc-test
$(call QUIET_CLEAN, initramfs.cpio)
$(Q)rm -rf initramfs.cpio
$(call QUIET_CLEAN, initramfs)
$(Q)rm -rf initramfs
$(call QUIET_CLEAN, run.out)
$(Q)rm -rf run.out
.PHONY: sysroot/$(ARCH)/include
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