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 -D__NO_FORTIFY 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 linking purgatory.ro with -r unresolved symbols are not checked, 23# also link a purgatory.chk binary without -r to check for unresolved symbols. 24PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib 25LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS) 26LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS) 27targets += purgatory.ro purgatory.chk 28 29# Sanitizer, etc. runtimes are unavailable and cannot be linked here. 30GCOV_PROFILE := n 31KASAN_SANITIZE := n 32UBSAN_SANITIZE := n 33KCSAN_SANITIZE := n 34KMSAN_SANITIZE := n 35KCOV_INSTRUMENT := n 36 37# These are adjustments to the compiler flags used for objects that 38# make up the standalone purgatory.ro 39 40PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 41PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0 42PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING 43PURGATORY_CFLAGS += -fno-stack-protector 44 45# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That 46# in turn leaves some undefined symbols like __fentry__ in purgatory and not 47# sure how to relocate those. 48ifdef CONFIG_FUNCTION_TRACER 49PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE) 50endif 51 52ifdef CONFIG_STACKPROTECTOR 53PURGATORY_CFLAGS_REMOVE += -fstack-protector 54endif 55 56ifdef CONFIG_STACKPROTECTOR_STRONG 57PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong 58endif 59 60ifdef CONFIG_RETPOLINE 61PURGATORY_CFLAGS_REMOVE += $(RETPOLINE_CFLAGS) 62endif 63 64ifdef CONFIG_CFI_CLANG 65PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_CFI) 66endif 67 68CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE) 69CFLAGS_purgatory.o += $(PURGATORY_CFLAGS) 70 71CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE) 72CFLAGS_sha256.o += $(PURGATORY_CFLAGS) 73 74CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE) 75CFLAGS_string.o += $(PURGATORY_CFLAGS) 76 77asflags-remove-y += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x)) 78 79$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE 80 $(call if_changed,ld) 81 82$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE 83 $(call if_changed,ld) 84 85$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk 86 87obj-y += kexec-purgatory.o 88