Makefile

  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
  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
 35CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
 36CFLAGS_string.o := -D__DISABLE_EXPORTS
 37CFLAGS_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.
 42KBUILD_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.
 46PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
 47LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
 48LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
 49targets += 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
 54PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
 55PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss
 56PURGATORY_CFLAGS += $(DISABLE_KSTACK_ERASE) -DDISABLE_BRANCH_PROFILING
 57PURGATORY_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.
 62ifdef CONFIG_FUNCTION_TRACER
 63PURGATORY_CFLAGS_REMOVE		+= $(CC_FLAGS_FTRACE)
 64endif
 65
 66ifdef CONFIG_STACKPROTECTOR
 67PURGATORY_CFLAGS_REMOVE		+= -fstack-protector
 68endif
 69
 70ifdef CONFIG_STACKPROTECTOR_STRONG
 71PURGATORY_CFLAGS_REMOVE		+= -fstack-protector-strong
 72endif
 73
 74ifdef CONFIG_CFI
 75PURGATORY_CFLAGS_REMOVE		+= $(CC_FLAGS_CFI)
 76endif
 77
 78ifdef CONFIG_RELOCATABLE
 79PURGATORY_CFLAGS_REMOVE		+= -fPIE
 80endif
 81
 82ifdef CONFIG_SHADOW_CALL_STACK
 83PURGATORY_CFLAGS_REMOVE		+= $(CC_FLAGS_SCS)
 84endif
 85
 86CFLAGS_REMOVE_purgatory.o	+= $(PURGATORY_CFLAGS_REMOVE)
 87CFLAGS_purgatory.o		+= $(PURGATORY_CFLAGS)
 88
 89CFLAGS_REMOVE_sha256.o		+= $(PURGATORY_CFLAGS_REMOVE)
 90CFLAGS_sha256.o			+= $(PURGATORY_CFLAGS)
 91
 92CFLAGS_REMOVE_string.o		+= $(PURGATORY_CFLAGS_REMOVE)
 93CFLAGS_string.o			+= $(PURGATORY_CFLAGS)
 94
 95CFLAGS_REMOVE_ctype.o		+= $(PURGATORY_CFLAGS_REMOVE)
 96CFLAGS_ctype.o			+= $(PURGATORY_CFLAGS)
 97
 98asflags-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
108obj-y += kexec-purgatory.o