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# SPDX-License-Identifier: GPL-2.0

purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o
ifeq ($(CONFIG_KASAN_GENERIC)$(CONFIG_KASAN_SW_TAGS),)
purgatory-y += strcmp.o strlen.o strncmp.o
endif

targets += $(purgatory-y)
PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))

$(obj)/string.o: $(srctree)/lib/string.c FORCE
 $(call if_changed_rule,cc_o_c)

$(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE
 $(call if_changed_rule,cc_o_c)

$(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE
 $(call if_changed_rule,as_o_S)

$(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE
 $(call if_changed_rule,as_o_S)

$(obj)/strcmp.o: $(srctree)/arch/riscv/lib/strcmp.S FORCE
 $(call if_changed_rule,as_o_S)

$(obj)/strlen.o: $(srctree)/arch/riscv/lib/strlen.S FORCE
 $(call if_changed_rule,as_o_S)

$(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE
 $(call if_changed_rule,as_o_S)

$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
 $(call if_changed_rule,cc_o_c)

CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
CFLAGS_string.o := -D__DISABLE_EXPORTS
CFLAGS_ctype.o := -D__DISABLE_EXPORTS

# When profile-guided optimization is enabled, llvm emits two different
# overlapping text sections, which is not supported by kexec. Remove profile
# optimization flags.
KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))

# When linking purgatory.ro with -r unresolved symbols are not checked,
# also link a purgatory.chk binary without -r to check for unresolved symbols.
PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
targets += purgatory.ro purgatory.chk

# These are adjustments to the compiler flags used for objects that
# make up the standalone purgatory.ro

PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss
PURGATORY_CFLAGS += $(DISABLE_KSTACK_ERASE) -DDISABLE_BRANCH_PROFILING
PURGATORY_CFLAGS += -fno-stack-protector -g0

# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
# in turn leaves some undefined symbols like __fentry__ in purgatory and not
# sure how to relocate those.
ifdef CONFIG_FUNCTION_TRACER
PURGATORY_CFLAGS_REMOVE  += $(CC_FLAGS_FTRACE)
endif

ifdef CONFIG_STACKPROTECTOR
PURGATORY_CFLAGS_REMOVE  += -fstack-protector
endif

ifdef CONFIG_STACKPROTECTOR_STRONG
PURGATORY_CFLAGS_REMOVE  += -fstack-protector-strong
endif

ifdef CONFIG_CFI_CLANG
PURGATORY_CFLAGS_REMOVE  += $(CC_FLAGS_CFI)
endif

ifdef CONFIG_RELOCATABLE
PURGATORY_CFLAGS_REMOVE  += -fPIE
endif

ifdef CONFIG_SHADOW_CALL_STACK
PURGATORY_CFLAGS_REMOVE  += $(CC_FLAGS_SCS)
endif

CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE)
CFLAGS_purgatory.o  += $(PURGATORY_CFLAGS)

CFLAGS_REMOVE_sha256.o  += $(PURGATORY_CFLAGS_REMOVE)
CFLAGS_sha256.o   += $(PURGATORY_CFLAGS)

CFLAGS_REMOVE_string.o  += $(PURGATORY_CFLAGS_REMOVE)
CFLAGS_string.o   += $(PURGATORY_CFLAGS)

CFLAGS_REMOVE_ctype.o  += $(PURGATORY_CFLAGS_REMOVE)
CFLAGS_ctype.o   += $(PURGATORY_CFLAGS)

asflags-remove-y  += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))

$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
  $(call if_changed,ld)

$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
  $(call if_changed,ld)

$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk

obj-y += kexec-purgatory.o