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 linking purgatory.ro with -r unresolved symbols are not checked, 18# also link a purgatory.chk binary without -r to check for unresolved symbols. 19PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib 20LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS) 21LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS) 22targets += purgatory.ro purgatory.chk 23 24# Sanitizer, etc. runtimes are unavailable and cannot be linked here. 25GCOV_PROFILE := n 26KASAN_SANITIZE := n 27UBSAN_SANITIZE := n 28KCSAN_SANITIZE := n 29KMSAN_SANITIZE := n 30KCOV_INSTRUMENT := n 31 32# These are adjustments to the compiler flags used for objects that 33# make up the standalone purgatory.ro 34 35PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 36PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0 37PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING 38PURGATORY_CFLAGS += -fno-stack-protector 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_RETPOLINE 56PURGATORY_CFLAGS_REMOVE += $(RETPOLINE_CFLAGS) 57endif 58 59ifdef CONFIG_CFI_CLANG 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