xref: /openbmc/linux/arch/riscv/purgatory/Makefile (revision 3ddc8b84) 
1# SPDX-License-Identifier: GPL-2.0
2OBJECT_FILES_NON_STANDARD := y
3
4purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o
5purgatory-y += strcmp.o strlen.o strncmp.o
6
7targets += $(purgatory-y)
8PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
9
10$(obj)/string.o: $(srctree)/lib/string.c FORCE
11	$(call if_changed_rule,cc_o_c)
12
13$(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE
14	$(call if_changed_rule,cc_o_c)
15
16$(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE
17	$(call if_changed_rule,as_o_S)
18
19$(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE
20	$(call if_changed_rule,as_o_S)
21
22$(obj)/strcmp.o: $(srctree)/arch/riscv/lib/strcmp.S FORCE
23	$(call if_changed_rule,as_o_S)
24
25$(obj)/strlen.o: $(srctree)/arch/riscv/lib/strlen.S FORCE
26	$(call if_changed_rule,as_o_S)
27
28$(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE
29	$(call if_changed_rule,as_o_S)
30
31$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
32	$(call if_changed_rule,cc_o_c)
33
34CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
35CFLAGS_string.o := -D__DISABLE_EXPORTS
36CFLAGS_ctype.o := -D__DISABLE_EXPORTS
37
38# When profile-guided optimization is enabled, llvm emits two different
39# overlapping text sections, which is not supported by kexec. Remove profile
40# optimization flags.
41KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
42
43# When linking purgatory.ro with -r unresolved symbols are not checked,
44# also link a purgatory.chk binary without -r to check for unresolved symbols.
45PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
46LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
47LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
48targets += purgatory.ro purgatory.chk
49
50# Sanitizer, etc. runtimes are unavailable and cannot be linked here.
51GCOV_PROFILE	:= n
52KASAN_SANITIZE	:= n
53UBSAN_SANITIZE	:= n
54KCSAN_SANITIZE	:= n
55KCOV_INSTRUMENT := n
56
57# These are adjustments to the compiler flags used for objects that
58# make up the standalone purgatory.ro
59
60PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
61PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss
62PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
63PURGATORY_CFLAGS += -fno-stack-protector -g0
64
65# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
66# in turn leaves some undefined symbols like __fentry__ in purgatory and not
67# sure how to relocate those.
68ifdef CONFIG_FUNCTION_TRACER
69PURGATORY_CFLAGS_REMOVE		+= $(CC_FLAGS_FTRACE)
70endif
71
72ifdef CONFIG_STACKPROTECTOR
73PURGATORY_CFLAGS_REMOVE		+= -fstack-protector
74endif
75
76ifdef CONFIG_STACKPROTECTOR_STRONG
77PURGATORY_CFLAGS_REMOVE		+= -fstack-protector-strong
78endif
79
80ifdef CONFIG_CFI_CLANG
81PURGATORY_CFLAGS_REMOVE		+= $(CC_FLAGS_CFI)
82endif
83
84CFLAGS_REMOVE_purgatory.o	+= $(PURGATORY_CFLAGS_REMOVE)
85CFLAGS_purgatory.o		+= $(PURGATORY_CFLAGS)
86
87CFLAGS_REMOVE_sha256.o		+= $(PURGATORY_CFLAGS_REMOVE)
88CFLAGS_sha256.o			+= $(PURGATORY_CFLAGS)
89
90CFLAGS_REMOVE_string.o		+= $(PURGATORY_CFLAGS_REMOVE)
91CFLAGS_string.o			+= $(PURGATORY_CFLAGS)
92
93CFLAGS_REMOVE_ctype.o		+= $(PURGATORY_CFLAGS_REMOVE)
94CFLAGS_ctype.o			+= $(PURGATORY_CFLAGS)
95
96asflags-remove-y		+= $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
97
98$(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
99		$(call if_changed,ld)
100
101$(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
102		$(call if_changed,ld)
103
104$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk
105
106obj-y += kexec-purgatory.o
107