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-rw-r--r--tools/testing/selftests/nolibc/Makefile135
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diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
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index 000000000..69ea659ca
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+++ b/tools/testing/selftests/nolibc/Makefile
@@ -0,0 +1,135 @@
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for nolibc tests
+include ../../../scripts/Makefile.include
+
+# we're in ".../tools/testing/selftests/nolibc"
+ifeq ($(srctree),)
+srctree := $(patsubst %/tools/testing/selftests/,%,$(dir $(CURDIR)))
+endif
+
+ifeq ($(ARCH),)
+include $(srctree)/scripts/subarch.include
+ARCH = $(SUBARCH)
+endif
+
+# kernel image names by architecture
+IMAGE_i386 = arch/x86/boot/bzImage
+IMAGE_x86 = arch/x86/boot/bzImage
+IMAGE_arm64 = arch/arm64/boot/Image
+IMAGE_arm = arch/arm/boot/zImage
+IMAGE_mips = vmlinuz
+IMAGE_riscv = arch/riscv/boot/Image
+IMAGE = $(IMAGE_$(ARCH))
+IMAGE_NAME = $(notdir $(IMAGE))
+
+# default kernel configurations that appear to be usable
+DEFCONFIG_i386 = defconfig
+DEFCONFIG_x86 = defconfig
+DEFCONFIG_arm64 = defconfig
+DEFCONFIG_arm = multi_v7_defconfig
+DEFCONFIG_mips = malta_defconfig
+DEFCONFIG_riscv = defconfig
+DEFCONFIG = $(DEFCONFIG_$(ARCH))
+
+# optional tests to run (default = all)
+TEST =
+
+# QEMU_ARCH: arch names used by qemu
+QEMU_ARCH_i386 = i386
+QEMU_ARCH_x86 = x86_64
+QEMU_ARCH_arm64 = aarch64
+QEMU_ARCH_arm = arm
+QEMU_ARCH_mips = mipsel # works with malta_defconfig
+QEMU_ARCH_riscv = riscv64
+QEMU_ARCH = $(QEMU_ARCH_$(ARCH))
+
+# 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 = -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_mips = -M malta -append "panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS_riscv = -M virt -append "console=ttyS0 panic=-1 $(TEST:%=NOLIBC_TEST=%)"
+QEMU_ARGS = $(QEMU_ARGS_$(ARCH))
+
+# 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 ?= -Os -fno-ident -fno-asynchronous-unwind-tables
+LDFLAGS := -s
+
+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 " initramfs prepare the initramfs with nolibc-test"
+ @echo " defconfig create a fresh new default config (uses \$$ARCH)"
+ @echo " kernel (re)build the kernel with the initramfs (uses \$$ARCH)"
+ @echo " run runs the kernel in QEMU after building it (uses \$$ARCH, \$$TEST)"
+ @echo " rerun runs a previously prebuilt kernel in QEMU (uses \$$ARCH, \$$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 " 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 \$$ARCH]"
+ @echo " IMAGE_NAME = $(if $(IMAGE_NAME),$(IMAGE_NAME),UNKNOWN_ARCH) [determined from \$$ARCH]"
+ @echo ""
+
+all: run
+
+sysroot: sysroot/$(ARCH)/include
+
+sysroot/$(ARCH)/include:
+ $(QUIET_MKDIR)mkdir -p sysroot
+ $(Q)$(MAKE) -C ../../../include/nolibc ARCH=$(ARCH) OUTPUT=$(CURDIR)/sysroot/ headers_standalone
+ $(Q)mv sysroot/sysroot sysroot/$(ARCH)
+
+nolibc-test: nolibc-test.c sysroot/$(ARCH)/include
+ $(QUIET_CC)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ \
+ -nostdlib -static -Isysroot/$(ARCH)/include $< -lgcc
+
+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) mrproper $(DEFCONFIG) prepare
+
+kernel: initramfs
+ $(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) $(IMAGE_NAME) CONFIG_INITRAMFS_SOURCE=$(CURDIR)/initramfs
+
+# run the tests after building the kernel
+run: kernel
+ $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
+ $(Q)grep -w FAIL "$(CURDIR)/run.out" && echo "See all results in $(CURDIR)/run.out" || echo "$$(grep -c ^[0-9].*OK $(CURDIR)/run.out) test(s) passed."
+
+# re-run the tests from an existing kernel
+rerun:
+ $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
+ $(Q)grep -w FAIL "$(CURDIR)/run.out" && echo "See all results in $(CURDIR)/run.out" || echo "$$(grep -c ^[0-9].*OK $(CURDIR)/run.out) test(s) passed."
+
+clean:
+ $(call QUIET_CLEAN, sysroot)
+ $(Q)rm -rf sysroot
+ $(call QUIET_CLEAN, nolibc-test)
+ $(Q)rm -f nolibc-test
+ $(call QUIET_CLEAN, initramfs)
+ $(Q)rm -rf initramfs
+ $(call QUIET_CLEAN, run.out)
+ $(Q)rm -rf run.out