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 # SPDX-License-Identifier: GPL-2.0
 #
 # Makefile for Kernel-based Virtual Machine module, HYP/nVHE part
 #
 
 asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
 
 # Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as
 # there is no way to execute them and any such MMIO access from nVHE KVM
 # will explode instantly (Words of Marc Zyngier). So introduce a generic flag
 # __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM.
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__
 
 hostprogs := gen-hyprel
 HOST_EXTRACFLAGS += -I$(objtree)/include
 
 lib-objs := clear_page.o copy_page.o memcpy.o memset.o
 lib-objs := $(addprefix ../../../lib/, $(lib-objs))
 
 hyp-obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
          hyp-main.o hyp-smp.o psci-relay.o early_alloc.o page_alloc.o \
          cache.o setup.o mm.o mem_protect.o sys_regs.o pkvm.o stacktrace.o
 hyp-obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
          ../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o
 hyp-obj-$(CONFIG_DEBUG_LIST) += list_debug.o
 hyp-obj-y += $(lib-objs)
 
 ##
 ## Build rules for compiling nVHE hyp code
 ## Output of this folder is `kvm_nvhe.o`, a partially linked object
 ## file containing all nVHE hyp code and data.
 ##
 
 hyp-obj := $(patsubst %.o,%.nvhe.o,$(hyp-obj-y))
 obj-y := kvm_nvhe.o
 targets += $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o
 
 # 1) Compile all source files to `.nvhe.o` object files. The file extension
 #    avoids file name clashes for files shared with VHE.
 $(obj)/%.nvhe.o: $(src)/%.c FORCE
         $(call if_changed_rule,cc_o_c)
 $(obj)/%.nvhe.o: $(src)/%.S FORCE
         $(call if_changed_rule,as_o_S)
 
 # 2) Compile linker script.
 $(obj)/hyp.lds: $(src)/hyp.lds.S FORCE
         $(call if_changed_dep,cpp_lds_S)
 
 # 3) Partially link all '.nvhe.o' files and apply the linker script.
 #    Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'.
 #    Note: The following rule assumes that the 'ld' rule puts LDFLAGS before
 #          the list of dependencies to form '-T $(obj)/hyp.lds'. This is to
 #          keep the dependency on the target while avoiding an error from
 #          GNU ld if the linker script is passed to it twice.
 LDFLAGS_kvm_nvhe.tmp.o := -r -T
 $(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
         $(call if_changed,ld)
 
 # 4) Generate list of hyp code/data positions that need to be relocated at
 #    runtime. Because the hypervisor is part of the kernel binary, relocations
 #    produce a kernel VA. We enumerate relocations targeting hyp at build time
 #    and convert the kernel VAs at those positions to hyp VAs.
 $(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE
         $(call if_changed,hyprel)
 
 # 5) Compile hyp-reloc.S and link it into the existing partially linked object.
 #    The object file now contains a section with pointers to hyp positions that
 #    will contain kernel VAs at runtime. These pointers have relocations on them
 #    so that they get updated as the hyp object is linked into `vmlinux`.
 LDFLAGS_kvm_nvhe.rel.o := -r
 $(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE
         $(call if_changed,ld)
 
 # 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
 #    Prefixes names of ELF symbols with '__kvm_nvhe_'.
 $(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE
         $(call if_changed,hypcopy)
 
 # The HYPREL command calls `gen-hyprel` to generate an assembly file with
 # a list of relocations targeting hyp code/data.
 quiet_cmd_hyprel = HYPREL  $@
       cmd_hyprel = $(obj)/gen-hyprel $< > $@
 
 # The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
 # to avoid clashes with VHE code/data.
 quiet_cmd_hypcopy = HYPCOPY $@
       cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@
 
 # Remove ftrace, Shadow Call Stack, and CFI CFLAGS.
 # This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations.
 KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS))
 
 # KVM nVHE code is run at a different exception code with a different map, so
 # compiler instrumentation that inserts callbacks or checks into the code may
 # cause crashes. Just disable it.
 GCOV_PROFILE    := n
 KASAN_SANITIZE  := n
 KCSAN_SANITIZE  := n
 UBSAN_SANITIZE  := n
 KCOV_INSTRUMENT := n
 
 # Skip objtool checking for this directory because nVHE code is compiled with
 # non-standard build rules.
 OBJECT_FILES_NON_STANDARD := y

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