1 # SPDX-License-Identifier: GPL-2.0
2 OBJECT_FILES_NON_STANDARD := y
4 purgatory-y := purgatory.o sha256.o entry.o string.o ctype.o memcpy.o memset.o
5 purgatory-y += strcmp.o strlen.o strncmp.o
7 targets += $(purgatory-y)
8 PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
10 $(obj)/string.o: $(srctree)/lib/string.c FORCE
11 $(call if_changed_rule,cc_o_c)
13 $(obj)/ctype.o: $(srctree)/lib/ctype.c FORCE
14 $(call if_changed_rule,cc_o_c)
16 $(obj)/memcpy.o: $(srctree)/arch/riscv/lib/memcpy.S FORCE
17 $(call if_changed_rule,as_o_S)
19 $(obj)/memset.o: $(srctree)/arch/riscv/lib/memset.S FORCE
20 $(call if_changed_rule,as_o_S)
22 $(obj)/strcmp.o: $(srctree)/arch/riscv/lib/strcmp.S FORCE
23 $(call if_changed_rule,as_o_S)
25 $(obj)/strlen.o: $(srctree)/arch/riscv/lib/strlen.S FORCE
26 $(call if_changed_rule,as_o_S)
28 $(obj)/strncmp.o: $(srctree)/arch/riscv/lib/strncmp.S FORCE
29 $(call if_changed_rule,as_o_S)
31 $(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
32 $(call if_changed_rule,cc_o_c)
34 CFLAGS_sha256.o := -D__DISABLE_EXPORTS -D__NO_FORTIFY
35 CFLAGS_string.o := -D__DISABLE_EXPORTS
36 CFLAGS_ctype.o := -D__DISABLE_EXPORTS
38 # When profile-guided optimization is enabled, llvm emits two different
39 # overlapping text sections, which is not supported by kexec. Remove profile
41 KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%,$(KBUILD_CFLAGS))
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.
45 PURGATORY_LDFLAGS := -e purgatory_start -z nodefaultlib
46 LDFLAGS_purgatory.ro := -r $(PURGATORY_LDFLAGS)
47 LDFLAGS_purgatory.chk := $(PURGATORY_LDFLAGS)
48 targets += purgatory.ro purgatory.chk
50 # Sanitizer, etc. runtimes are unavailable and cannot be linked here.
57 # These are adjustments to the compiler flags used for objects that
58 # make up the standalone purgatory.ro
60 PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
61 PURGATORY_CFLAGS := -mcmodel=medany -ffreestanding -fno-zero-initialized-in-bss
62 PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN) -DDISABLE_BRANCH_PROFILING
63 PURGATORY_CFLAGS += -fno-stack-protector -g0
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.
68 ifdef CONFIG_FUNCTION_TRACER
69 PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_FTRACE)
72 ifdef CONFIG_STACKPROTECTOR
73 PURGATORY_CFLAGS_REMOVE += -fstack-protector
76 ifdef CONFIG_STACKPROTECTOR_STRONG
77 PURGATORY_CFLAGS_REMOVE += -fstack-protector-strong
80 ifdef CONFIG_CFI_CLANG
81 PURGATORY_CFLAGS_REMOVE += $(CC_FLAGS_CFI)
84 CFLAGS_REMOVE_purgatory.o += $(PURGATORY_CFLAGS_REMOVE)
85 CFLAGS_purgatory.o += $(PURGATORY_CFLAGS)
87 CFLAGS_REMOVE_sha256.o += $(PURGATORY_CFLAGS_REMOVE)
88 CFLAGS_sha256.o += $(PURGATORY_CFLAGS)
90 CFLAGS_REMOVE_string.o += $(PURGATORY_CFLAGS_REMOVE)
91 CFLAGS_string.o += $(PURGATORY_CFLAGS)
93 CFLAGS_REMOVE_ctype.o += $(PURGATORY_CFLAGS_REMOVE)
94 CFLAGS_ctype.o += $(PURGATORY_CFLAGS)
96 asflags-remove-y += $(foreach x, -g -gdwarf-4 -gdwarf-5, $(x) -Wa,$(x))
98 $(obj)/purgatory.ro: $(PURGATORY_OBJS) FORCE
101 $(obj)/purgatory.chk: $(obj)/purgatory.ro FORCE
102 $(call if_changed,ld)
104 $(obj)/kexec-purgatory.o: $(obj)/purgatory.ro $(obj)/purgatory.chk
106 obj-y += kexec-purgatory.o