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