1 # SPDX-License-Identifier: GPL-2.0
2
3 purgatory-y := purgatory.o stack.o setup-x86_$
4
5 targets += $(purgatory-y)
6 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgato
7
8 $(obj)/string.o: $(srctree)/arch/x86/boot/comp
9 $(call if_changed_rule,cc_o_c)
10
11 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.
12 $(call if_changed_rule,cc_o_c)
13
14 CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_
15
16 # When profile-guided optimization is enabled,
17 # overlapping text sections, which is not supp
18 # optimization flags.
19 KBUILD_CFLAGS := $(filter-out -fprofile-sample
20
21 # When LTO is enabled, llvm emits many text se
22 # by kexec. Remove -flto=* flags.
23 KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO),
24
25 # When linking purgatory.ro with -r unresolved
26 # also link a purgatory.chk binary without -r
27 PURGATORY_LDFLAGS := -e purgatory_start -z nod
28 LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS
29 LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
30 targets += purgatory.ro purgatory.chk
31
32 # These are adjustments to the compiler flags
33 # make up the standalone purgatory.ro
34
35 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
36 PURGATORY_CFLAGS := -mcmodel=small -ffreestand
37 PURGATORY_CFLAGS += -fpic -fvisibility=hidden
38 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN
39 PURGATORY_CFLAGS += -fno-stack-protector
40
41 # Default KBUILD_CFLAGS can have -pg option se
42 # in turn leaves some undefined symbols like _
43 # sure how to relocate those.
44 ifdef CONFIG_FUNCTION_TRACER
45 PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_
46 endif
47
48 ifdef CONFIG_STACKPROTECTOR
49 PURGATORY_CFLAGS_REMOVE += -fstack-pro
50 endif
51
52 ifdef CONFIG_STACKPROTECTOR_STRONG
53 PURGATORY_CFLAGS_REMOVE += -fstack-pro
54 endif
55
56 ifdef CONFIG_MITIGATION_RETPOLINE
57 PURGATORY_CFLAGS_REMOVE += $(RETPOLINE
58 endif
59
60 ifdef CONFIG_CFI_CLANG
61 PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_
62 endif
63
64 CFLAGS_REMOVE_purgatory.o += $(PURGATORY
65 CFLAGS_purgatory.o += $(PURGATORY
66
67 CFLAGS_REMOVE_sha256.o += $(PURGATORY
68 CFLAGS_sha256.o += $(PURGATORY
69
70 CFLAGS_REMOVE_string.o += $(PURGATORY
71 CFLAGS_string.o += $(PURGATORY
72
73 asflags-remove-y += $(foreach x
74
75 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
76 $(call if_changed,ld)
77
78 $(obj)/purgatory.chk: $(obj)/purgatory.ro FORC
79 $(call if_changed,ld)
80
81 $(obj)/kexec-purgatory.o: $(obj)/purgatory.ro
82
83 obj-y += kexec-purgatory.o
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