xref: /linux/arch/s390/purgatory/Makefile (revision cd59f1d80a6d01326e37318218a072a46899d237)
1# SPDX-License-Identifier: GPL-2.0
2
3purgatory-y := head.o purgatory.o string.o sha256.o mem.o
4
5targets += $(purgatory-y) purgatory.lds purgatory purgatory.chk purgatory.ro
6PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
7
8$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
9	$(call if_changed_rule,cc_o_c)
10
11CFLAGS_sha256.o := -D__NO_FORTIFY
12
13$(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S FORCE
14	$(call if_changed_rule,as_o_S)
15
16KBUILD_CFLAGS := -std=gnu11 -fno-strict-aliasing -Wall -Wstrict-prototypes
17KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
18KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
19KBUILD_CFLAGS += -Os -m64 -msoft-float -fno-common
20KBUILD_CFLAGS += -fno-stack-protector
21KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
22KBUILD_CFLAGS += -D__DISABLE_EXPORTS
23KBUILD_CFLAGS += $(CLANG_FLAGS)
24KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
25KBUILD_AFLAGS := $(filter-out -DCC_USING_EXPOLINE,$(KBUILD_AFLAGS))
26KBUILD_AFLAGS += -D__DISABLE_EXPORTS
27
28# Since we link purgatory with -r unresolved symbols are not checked, so we
29# also link a purgatory.chk binary without -r to check for unresolved symbols.
30PURGATORY_LDFLAGS := -nostdlib -z nodefaultlib
31LDFLAGS_purgatory := -r $(PURGATORY_LDFLAGS) -T
32LDFLAGS_purgatory.chk := -e purgatory_start $(PURGATORY_LDFLAGS)
33$(obj)/purgatory: $(obj)/purgatory.lds $(PURGATORY_OBJS) FORCE
34		$(call if_changed,ld)
35
36$(obj)/purgatory.chk: $(obj)/purgatory FORCE
37		$(call if_changed,ld)
38
39OBJCOPYFLAGS_purgatory.ro := -O elf64-s390
40OBJCOPYFLAGS_purgatory.ro += --remove-section='*debug*'
41OBJCOPYFLAGS_purgatory.ro += --remove-section='.comment'
42OBJCOPYFLAGS_purgatory.ro += --remove-section='.note.*'
43$(obj)/purgatory.ro: $(obj)/purgatory $(obj)/purgatory.chk FORCE
44		$(call if_changed,objcopy)
45
46$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro
47
48obj-y += kexec-purgatory.o
49