1# SPDX-License-Identifier: GPL-2.0 2OBJECT_FILES_NON_STANDARD := y 3 4purgatory-y := purgatory.o stack.o setup-x86_$(BITS).o sha256.o entry64.o string.o 5 6targets += $(purgatory-y) 7PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y)) 8 9$(obj)/string.o: $(srctree)/arch/x86/boot/compressed/string.c FORCE 10 $(call if_changed_rule,cc_o_c) 11 12$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE 13 $(call if_changed_rule,cc_o_c) 14 15CFLAGS_sha256.o := -D__DISABLE_EXPORTS 16 17# When profile-guided optimization is enabled, llvm emits two different 18# overlapping text sections, which is not supported by kexec. Remove profile 19# optimization flags. 20KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS)) 21 22# When LTO is enabled, llvm emits many text sections, which is not supported 23# by kexec. Remove -flto=* flags. 24KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO),$(KBUILD_CFLAGS)) 25 26# When linking purgatory.ro with -r unresolved symbols are not checked, 27# also link a purgatory.chk binary without -r to check for unresolved symbols. 28PURGATORY_LDFLAGS := -e purgatory_start -nostdlib -z nodefaultlib 29LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS) 30LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS) 31targets += purgatory.ro purgatory.chk 32 33# Sanitizer, etc. runtimes are unavailable and cannot be linked here. 34GCOV_PROFILE := n 35KASAN_SANITIZE := n 36UBSAN_SANITIZE := n 37KCSAN_SANITIZE := n 38KCOV_INSTRUMENT := n 39 40# These are adjustments to the compiler flags used for objects that 41# make up the standalone purgatory.ro 42 43PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 44PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0 45PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING 46PURGATORY_CFLAGS += -fno-stack-protector 47 48# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That 49# in turn leaves some undefined symbols like __fentry__ in purgatory and not 50# sure how to relocate those. 51ifdef CONFIG_FUNCTION_TRACER 52PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE) 53endif 54 55ifdef CONFIG_STACKPROTECTOR 56PURGATORY_CFLAGS_REMOVE += -fstack-protector 57endif 58 59ifdef CONFIG_STACKPROTECTOR_STRONG 60PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong 61endif 62 63ifdef CONFIG_RETPOLINE 64PURGATORY_CFLAGS_REMOVE += $(RETPOLINE_CFLAGS) 65endif 66 67CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE) 68CFLAGS_purgatory.o += $(PURGATORY_CFLAGS) 69 70CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE) 71CFLAGS_sha256.o += $(PURGATORY_CFLAGS) 72 73CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE) 74CFLAGS_string.o += $(PURGATORY_CFLAGS) 75 76asflags-remove-y += -g -Wa,-gdwarf-2 77 78$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE 79 $(call if_changed,ld) 80 81$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE 82 $(call if_changed,ld) 83 84targets += kexec-purgatory.c 85 86quiet_cmd_bin2c = BIN2C $@ 87 cmd_bin2c = $(objtree)/scripts/bin2c kexec_purgatory < $< > $@ 88 89$(obj)/kexec-purgatory.c: $(obj)/purgatory.ro $(obj)/purgatory.chk FORCE 90 $(call if_changed,bin2c) 91 92obj-$(CONFIG_KEXEC_FILE) += kexec-purgatory.o 93