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 29KCOV_INSTRUMENT := n 30 31# These are adjustments to the compiler flags used for objects that 32# make up the standalone purgatory.ro 33 34PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 35PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0 36PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING 37PURGATORY_CFLAGS += -fno-stack-protector 38 39# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That 40# in turn leaves some undefined symbols like __fentry__ in purgatory and not 41# sure how to relocate those. 42ifdef CONFIG_FUNCTION_TRACER 43PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE) 44endif 45 46ifdef CONFIG_STACKPROTECTOR 47PURGATORY_CFLAGS_REMOVE += -fstack-protector 48endif 49 50ifdef CONFIG_STACKPROTECTOR_STRONG 51PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong 52endif 53 54ifdef CONFIG_RETPOLINE 55PURGATORY_CFLAGS_REMOVE += $(RETPOLINE_CFLAGS) 56endif 57 58CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE) 59CFLAGS_purgatory.o += $(PURGATORY_CFLAGS) 60 61CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE) 62CFLAGS_sha256.o += $(PURGATORY_CFLAGS) 63 64CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE) 65CFLAGS_string.o += $(PURGATORY_CFLAGS) 66 67AFLAGS_REMOVE_setup-x86_$(BITS).o += -Wa,-gdwarf-2 68AFLAGS_REMOVE_entry64.o += -Wa,-gdwarf-2 69 70$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE 71 $(call if_changed,ld) 72 73$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE 74 $(call if_changed,ld) 75 76$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk 77 78obj-y += kexec-purgatory.o 79