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