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