1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 2c0dd6716SJosh PoimboeufOBJECT_FILES_NON_STANDARD := y 3c0dd6716SJosh Poimboeuf 48fc5b4d4SVivek Goyalpurgatory-y := purgatory.o stack.o setup-x86_$(BITS).o sha256.o entry64.o string.o 58fc5b4d4SVivek Goyal 68fc5b4d4SVivek Goyaltargets += $(purgatory-y) 78fc5b4d4SVivek GoyalPURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y)) 88fc5b4d4SVivek Goyal 94ce97317SNick Desaulniers$(obj)/string.o: $(srctree)/arch/x86/boot/compressed/string.c FORCE 104ce97317SNick Desaulniers $(call if_changed_rule,cc_o_c) 114ce97317SNick Desaulniers 12ad767ee8SHans de Goede$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE 13df6f2801SPhilipp Rudo $(call if_changed_rule,cc_o_c) 14df6f2801SPhilipp Rudo 1501d3aee8SHans de GoedeCFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY 1601d3aee8SHans de Goede 17e4160b2eSHans de Goede# When profile-guided optimization is enabled, llvm emits two different 18e4160b2eSHans de Goede# overlapping text sections, which is not supported by kexec. Remove profile 199102fa34SMasahiro Yamada# optimization flags. 20e4160b2eSHans de GoedeKBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS)) 21e4160b2eSHans de Goede 22e4160b2eSHans de Goede# When LTO is enabled, llvm emits many text sections, which is not supported 238fc5b4d4SVivek Goyal# by kexec. Remove -flto=* flags. 24e2ac07c0SHans de GoedeKBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO),$(KBUILD_CFLAGS)) 25e2ac07c0SHans de Goede 2613a6798eSMike Galbraith# When linking purgatory.ro with -r unresolved symbols are not checked, 27e2ac07c0SHans de Goede# also link a purgatory.chk binary without -r to check for unresolved symbols. 2840d04110SMarco ElverPURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib 29*42855f58SAlexander PotapenkoLDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS) 30543c37cbSEmese RevfyLDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS) 31543c37cbSEmese Revfytargets += purgatory.ro purgatory.chk 32e16c2983SSteve Wahl 33e16c2983SSteve Wahl# Sanitizer, etc. runtimes are unavailable and cannot be linked here. 34e16c2983SSteve WahlGCOV_PROFILE := n 35e16c2983SSteve WahlKASAN_SANITIZE := n 3652416ffcSPingfan LiuUBSAN_SANITIZE := n 37e2ac07c0SHans de GoedeKCSAN_SANITIZE := n 38893ab004SMasahiro YamadaKMSAN_SANITIZE := n 39e16c2983SSteve WahlKCOV_INSTRUMENT := n 408fc5b4d4SVivek Goyal 418fc5b4d4SVivek Goyal# These are adjustments to the compiler flags used for objects that 42b059f801SNick Desaulniers# make up the standalone purgatory.ro 43b059f801SNick Desaulniers 44e16c2983SSteve WahlPURGATORY_CFLAGS_REMOVE := -mcmodel=kernel 45b059f801SNick DesaulniersPURGATORY_CFLAGS := -mcmodel=small -ffreestanding -fno-zero-initialized-in-bss -g0 468fc5b4d4SVivek GoyalPURGATORY_CFLAGS += -fpic -fvisibility=hidden 47b059f801SNick DesaulniersPURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING 48e16c2983SSteve WahlPURGATORY_CFLAGS += -fno-stack-protector 49b059f801SNick Desaulniers 50b059f801SNick Desaulniers# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That 51b059f801SNick Desaulniers# in turn leaves some undefined symbols like __fentry__ in purgatory and not 52e16c2983SSteve Wahl# sure how to relocate those. 53b059f801SNick Desaulniersifdef CONFIG_FUNCTION_TRACER 54b059f801SNick DesaulniersPURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE) 55b059f801SNick Desaulniersendif 56e16c2983SSteve Wahl 57b059f801SNick Desaulniersifdef CONFIG_STACKPROTECTOR 588fc5b4d4SVivek GoyalPURGATORY_CFLAGS_REMOVE += -fstack-protector 59a4b7a12cSSami Tolvanenendif 60a4b7a12cSSami Tolvanen 61a4b7a12cSSami Tolvanenifdef CONFIG_STACKPROTECTOR_STRONG 62a4b7a12cSSami TolvanenPURGATORY_CFLAGS_REMOVE += -fstack-protector-strong 63e16c2983SSteve Wahlendif 64e16c2983SSteve Wahl 65e16c2983SSteve Wahlifdef CONFIG_RETPOLINE 66e16c2983SSteve WahlPURGATORY_CFLAGS_REMOVE += $(RETPOLINE_CFLAGS) 67e16c2983SSteve Wahlendif 68e16c2983SSteve Wahl 69e16c2983SSteve Wahlifdef CONFIG_CFI_CLANG 70e16c2983SSteve WahlPURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_CFI) 71e16c2983SSteve Wahlendif 7252416ffcSPingfan Liu 7352416ffcSPingfan LiuCFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE) 7452416ffcSPingfan LiuCFLAGS_purgatory.o += $(PURGATORY_CFLAGS) 758fc5b4d4SVivek Goyal 768fc5b4d4SVivek GoyalCFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE) 778fc5b4d4SVivek GoyalCFLAGS_sha256.o += $(PURGATORY_CFLAGS) 78e4160b2eSHans de Goede 79e4160b2eSHans de GoedeCFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE) 80e4160b2eSHans de GoedeCFLAGS_string.o += $(PURGATORY_CFLAGS) 812d17bd24SMasahiro Yamada 828fc5b4d4SVivek Goyalasflags-remove-y += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x)) 8361922d3fSMasahiro Yamada 84$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE 85 $(call if_changed,ld) 86 87$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE 88 $(call if_changed,ld) 89 90$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk 91 92obj-y += kexec-purgatory.o 93