1# SPDX-License-Identifier: GPL-2.0 2 3purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o 4purgatory-y += strcmp.o strlen.o strncmp.o 5 6targets += $(purgatory-y) 7PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y)) 8 9$(obj)/string.o: $(srctree)/lib/string.c FORCE 10 $(call if_changed_rule,cc_o_c) 11 12$(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE 13 $(call if_changed_rule,cc_o_c) 14 15$(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE 16 $(call if_changed_rule,as_o_S) 17 18$(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE 19 $(call if_changed_rule,as_o_S) 20 21$(obj)/strcmp.o: $(srctree)/arch/riscv/lib/strcmp.S FORCE 22 $(call if_changed_rule,as_o_S) 23 24$(obj)/strlen.o: $(srctree)/arch/riscv/lib/strlen.S FORCE 25 $(call if_changed_rule,as_o_S) 26 27$(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE 28 $(call if_changed_rule,as_o_S) 29 30$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE 31 $(call if_changed_rule,cc_o_c) 32 33CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY 34CFLAGS_string.o := -D__DISABLE_EXPORTS 35CFLAGS_ctype.o := -D__DISABLE_EXPORTS 36 37# When profile-guided optimization is enabled, llvm emits two different 38# overlapping text sections, which is not supported by kexec. Remove profile 39# optimization flags. 40KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS)) 41 42# When linking purgatory.ro with -r unresolved symbols are not checked, 43# also link a purgatory.chk binary without -r to check for unresolved symbols. 44PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib 45LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS) 46LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS) 47targets += purgatory.ro purgatory.chk 48 49# These are adjustments to the compiler flags used for objects that 50# make up the standalone purgatory.ro 51 52PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 53PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss 54PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING 55PURGATORY_CFLAGS += -fno-stack-protector -g0 56 57# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That 58# in turn leaves some undefined symbols like __fentry__ in purgatory and not 59# sure how to relocate those. 60ifdef CONFIG_FUNCTION_TRACER 61PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE) 62endif 63 64ifdef CONFIG_STACKPROTECTOR 65PURGATORY_CFLAGS_REMOVE += -fstack-protector 66endif 67 68ifdef CONFIG_STACKPROTECTOR_STRONG 69PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong 70endif 71 72ifdef CONFIG_CFI_CLANG 73PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_CFI) 74endif 75 76ifdef CONFIG_RELOCATABLE 77PURGATORY_CFLAGS_REMOVE += -fPIE 78endif 79 80ifdef CONFIG_SHADOW_CALL_STACK 81PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_SCS) 82endif 83 84CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE) 85CFLAGS_purgatory.o += $(PURGATORY_CFLAGS) 86 87CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE) 88CFLAGS_sha256.o += $(PURGATORY_CFLAGS) 89 90CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE) 91CFLAGS_string.o += $(PURGATORY_CFLAGS) 92 93CFLAGS_REMOVE_ctype.o += $(PURGATORY_CFLAGS_REMOVE) 94CFLAGS_ctype.o += $(PURGATORY_CFLAGS) 95 96asflags-remove-y += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x)) 97 98$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE 99 $(call if_changed,ld) 100 101$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE 102 $(call if_changed,ld) 103 104$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk 105 106obj-y += kexec-purgatory.o 107