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