1# SPDX-License-Identifier: GPL-2.0 2 3purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o 4ifeq ($(CONFIG_KASAN_GENERIC)$(CONFIG_KASAN_SW_TAGS),) 5purgatory-y += strcmp.o strlen.o strncmp.o strnlen.o strchr.o strrchr.o 6endif 7 8targets += $(purgatory-y) 9PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y)) 10 11$(obj)/string.o: $(srctree)/lib/string.c FORCE 12 $(call if_changed_rule,cc_o_c) 13 14$(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE 15 $(call if_changed_rule,cc_o_c) 16 17$(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE 18 $(call if_changed_rule,as_o_S) 19 20$(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE 21 $(call if_changed_rule,as_o_S) 22 23$(obj)/strcmp.o: $(srctree)/arch/riscv/lib/strcmp.S FORCE 24 $(call if_changed_rule,as_o_S) 25 26$(obj)/strlen.o: $(srctree)/arch/riscv/lib/strlen.S FORCE 27 $(call if_changed_rule,as_o_S) 28 29$(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE 30 $(call if_changed_rule,as_o_S) 31 32$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE 33 $(call if_changed_rule,cc_o_c) 34 35$(obj)/strnlen.o: $(srctree)/arch/riscv/lib/strnlen.S FORCE 36 $(call if_changed_rule,as_o_S) 37 38$(obj)/strchr.o: $(srctree)/arch/riscv/lib/strchr.S FORCE 39 $(call if_changed_rule,as_o_S) 40 41$(obj)/strrchr.o: $(srctree)/arch/riscv/lib/strrchr.S FORCE 42 $(call if_changed_rule,as_o_S) 43 44CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY 45CFLAGS_string.o := -D__DISABLE_EXPORTS 46CFLAGS_ctype.o := -D__DISABLE_EXPORTS 47 48# When profile-guided optimization is enabled, llvm emits two different 49# overlapping text sections, which is not supported by kexec. Remove profile 50# optimization flags. 51KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS)) 52 53# When linking purgatory.ro with -r unresolved symbols are not checked, 54# also link a purgatory.chk binary without -r to check for unresolved symbols. 55PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib 56LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS) 57LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS) 58targets += purgatory.ro purgatory.chk 59 60# These are adjustments to the compiler flags used for objects that 61# make up the standalone purgatory.ro 62 63PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 64PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss 65PURGATORY_CFLAGS += $(DISABLE_KSTACK_ERASE) -DDISABLE_BRANCH_PROFILING 66PURGATORY_CFLAGS += -fno-stack-protector -g0 67 68# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That 69# in turn leaves some undefined symbols like __fentry__ in purgatory and not 70# sure how to relocate those. 71ifdef CONFIG_FUNCTION_TRACER 72PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE) 73endif 74 75ifdef CONFIG_STACKPROTECTOR 76PURGATORY_CFLAGS_REMOVE += -fstack-protector 77endif 78 79ifdef CONFIG_STACKPROTECTOR_STRONG 80PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong 81endif 82 83ifdef CONFIG_CFI 84PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_CFI) 85endif 86 87ifdef CONFIG_RELOCATABLE 88PURGATORY_CFLAGS_REMOVE += -fPIE 89endif 90 91ifdef CONFIG_SHADOW_CALL_STACK 92PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_SCS) 93endif 94 95CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE) 96CFLAGS_purgatory.o += $(PURGATORY_CFLAGS) 97 98CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE) 99CFLAGS_sha256.o += $(PURGATORY_CFLAGS) 100 101CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE) 102CFLAGS_string.o += $(PURGATORY_CFLAGS) 103 104CFLAGS_REMOVE_ctype.o += $(PURGATORY_CFLAGS_REMOVE) 105CFLAGS_ctype.o += $(PURGATORY_CFLAGS) 106 107asflags-remove-y += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x)) 108 109$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE 110 $(call if_changed,ld) 111 112$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE 113 $(call if_changed,ld) 114 115$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk 116 117obj-y += kexec-purgatory.o 118