xref: /openbmc/linux/arch/arm64/kvm/hyp/nvhe/Makefile (revision 842ed298)
1# SPDX-License-Identifier: GPL-2.0
2#
3# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part
4#
5
6asflags-y := -D__KVM_NVHE_HYPERVISOR__
7ccflags-y := -D__KVM_NVHE_HYPERVISOR__
8
9obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
10	 hyp-main.o hyp-smp.o psci-relay.o
11obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
12	 ../fpsimd.o ../hyp-entry.o ../exception.o
13
14##
15## Build rules for compiling nVHE hyp code
16## Output of this folder is `kvm_nvhe.o`, a partially linked object
17## file containing all nVHE hyp code and data.
18##
19
20hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y))
21obj-y := kvm_nvhe.o
22extra-y := $(hyp-obj) kvm_nvhe.tmp.o hyp.lds
23
24# 1) Compile all source files to `.nvhe.o` object files. The file extension
25#    avoids file name clashes for files shared with VHE.
26$(obj)/%.nvhe.o: $(src)/%.c FORCE
27	$(call if_changed_rule,cc_o_c)
28$(obj)/%.nvhe.o: $(src)/%.S FORCE
29	$(call if_changed_rule,as_o_S)
30
31# 2) Compile linker script.
32$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE
33	$(call if_changed_dep,cpp_lds_S)
34
35# 3) Partially link all '.nvhe.o' files and apply the linker script.
36#    Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'.
37#    Note: The following rule assumes that the 'ld' rule puts LDFLAGS before
38#          the list of dependencies to form '-T $(obj)/hyp.lds'. This is to
39#          keep the dependency on the target while avoiding an error from
40#          GNU ld if the linker script is passed to it twice.
41LDFLAGS_kvm_nvhe.tmp.o := -r -T
42$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
43	$(call if_changed,ld)
44
45# 4) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
46#    Prefixes names of ELF symbols with '__kvm_nvhe_'.
47$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.tmp.o FORCE
48	$(call if_changed,hypcopy)
49
50# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
51# to avoid clashes with VHE code/data.
52quiet_cmd_hypcopy = HYPCOPY $@
53      cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@
54
55# Remove ftrace and Shadow Call Stack CFLAGS.
56# This is equivalent to the 'notrace' and '__noscs' annotations.
57KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
58
59# KVM nVHE code is run at a different exception code with a different map, so
60# compiler instrumentation that inserts callbacks or checks into the code may
61# cause crashes. Just disable it.
62GCOV_PROFILE	:= n
63KASAN_SANITIZE	:= n
64UBSAN_SANITIZE	:= n
65KCOV_INSTRUMENT	:= n
66
67# Skip objtool checking for this directory because nVHE code is compiled with
68# non-standard build rules.
69OBJECT_FILES_NON_STANDARD := y
70