1 # SPDX-License-Identifier: GPL-2.0
2 OBJECT_FILES_NON_STANDARD := y
4 purgatory-y := purgatory.o stack.o setup-x86_$(BITS).o sha256.o entry64.o string.o
6 targets += $(purgatory-y)
7 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
9 $(obj)/string.o: $(srctree)/arch/x86/boot/compressed/string.c FORCE
10 $(call if_changed_rule,cc_o_c)
12 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
13 $(call if_changed_rule,cc_o_c)
15 CFLAGS_sha256.o := -D__DISABLE_EXPORTS
17 # When profile-guided optimization is enabled, llvm emits two different
18 # overlapping text sections, which is not supported by kexec. Remove profile
20 KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
22 # When linking purgatory.ro with -r unresolved symbols are not checked,
23 # also link a purgatory.chk binary without -r to check for unresolved symbols.
24 PURGATORY_LDFLAGS := -e purgatory_start -nostdlib -z nodefaultlib
25 LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
26 LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
27 targets += purgatory.ro purgatory.chk
29 # Sanitizer, etc. runtimes are unavailable and cannot be linked here.
36 # These are adjustments to the compiler flags used for objects that
37 # make up the standalone purgatory.ro
39 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
40 PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss -g0
41 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
42 PURGATORY_CFLAGS += -fno-stack-protector
44 # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
45 # in turn leaves some undefined symbols like __fentry__ in purgatory and not
46 # sure how to relocate those.
47 ifdef CONFIG_FUNCTION_TRACER
48 PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE)
51 ifdef CONFIG_STACKPROTECTOR
52 PURGATORY_CFLAGS_REMOVE += -fstack-protector
55 ifdef CONFIG_STACKPROTECTOR_STRONG
56 PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong
59 ifdef CONFIG_RETPOLINE
60 PURGATORY_CFLAGS_REMOVE += $(RETPOLINE_CFLAGS)
63 CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE)
64 CFLAGS_purgatory.o += $(PURGATORY_CFLAGS)
66 CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE)
67 CFLAGS_sha256.o += $(PURGATORY_CFLAGS)
69 CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE)
70 CFLAGS_string.o += $(PURGATORY_CFLAGS)
72 asflags-remove-y += -g -Wa,-gdwarf-2
74 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
77 $(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
80 targets += kexec-purgatory.c
82 quiet_cmd_bin2c = BIN2C $@
83 cmd_bin2c = $(objtree)/scripts/bin2c kexec_purgatory < $< > $@
85 $(obj)/kexec-purgatory.c: $(obj)/purgatory.ro $(obj)/purgatory.chk FORCE
86 $(call if_changed,bin2c)
88 obj-$(CONFIG_KEXEC_FILE) += kexec-purgatory.o