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97 lines
4.0 KiB
97 lines
4.0 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Makefile for Kernel-based Virtual Machine module, HYP/nVHE part |
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# |
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asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS |
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ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS |
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hostprogs := gen-hyprel |
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HOST_EXTRACFLAGS += -I$(objtree)/include |
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lib-objs := clear_page.o copy_page.o memcpy.o memset.o |
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lib-objs := $(addprefix ../../../lib/, $(lib-objs)) |
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obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \ |
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hyp-main.o hyp-smp.o psci-relay.o early_alloc.o stub.o page_alloc.o \ |
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cache.o setup.o mm.o mem_protect.o |
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obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ |
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../fpsimd.o ../hyp-entry.o ../exception.o ../pgtable.o |
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obj-y += $(lib-objs) |
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## |
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## Build rules for compiling nVHE hyp code |
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## Output of this folder is `kvm_nvhe.o`, a partially linked object |
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## file containing all nVHE hyp code and data. |
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## |
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hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y)) |
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obj-y := kvm_nvhe.o |
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extra-y := $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o |
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# 1) Compile all source files to `.nvhe.o` object files. The file extension |
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# avoids file name clashes for files shared with VHE. |
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$(obj)/%.nvhe.o: $(src)/%.c FORCE |
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$(call if_changed_rule,cc_o_c) |
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$(obj)/%.nvhe.o: $(src)/%.S FORCE |
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$(call if_changed_rule,as_o_S) |
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# 2) Compile linker script. |
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$(obj)/hyp.lds: $(src)/hyp.lds.S FORCE |
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$(call if_changed_dep,cpp_lds_S) |
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# 3) Partially link all '.nvhe.o' files and apply the linker script. |
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# Prefixes names of ELF sections with '.hyp', eg. '.hyp.text'. |
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# Note: The following rule assumes that the 'ld' rule puts LDFLAGS before |
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# the list of dependencies to form '-T $(obj)/hyp.lds'. This is to |
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# keep the dependency on the target while avoiding an error from |
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# GNU ld if the linker script is passed to it twice. |
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LDFLAGS_kvm_nvhe.tmp.o := -r -T |
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$(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE |
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$(call if_changed,ld) |
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# 4) Generate list of hyp code/data positions that need to be relocated at |
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# runtime. Because the hypervisor is part of the kernel binary, relocations |
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# produce a kernel VA. We enumerate relocations targeting hyp at build time |
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# and convert the kernel VAs at those positions to hyp VAs. |
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$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel FORCE |
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$(call if_changed,hyprel) |
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# 5) Compile hyp-reloc.S and link it into the existing partially linked object. |
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# The object file now contains a section with pointers to hyp positions that |
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# will contain kernel VAs at runtime. These pointers have relocations on them |
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# so that they get updated as the hyp object is linked into `vmlinux`. |
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LDFLAGS_kvm_nvhe.rel.o := -r |
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$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE |
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$(call if_changed,ld) |
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# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'. |
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# Prefixes names of ELF symbols with '__kvm_nvhe_'. |
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$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE |
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$(call if_changed,hypcopy) |
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# The HYPREL command calls `gen-hyprel` to generate an assembly file with |
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# a list of relocations targeting hyp code/data. |
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quiet_cmd_hyprel = HYPREL $@ |
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cmd_hyprel = $(obj)/gen-hyprel $< > $@ |
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# The HYPCOPY command uses `objcopy` to prefix all ELF symbol names |
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# to avoid clashes with VHE code/data. |
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quiet_cmd_hypcopy = HYPCOPY $@ |
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cmd_hypcopy = $(OBJCOPY) --prefix-symbols=__kvm_nvhe_ $< $@ |
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# Remove ftrace, Shadow Call Stack, and CFI CFLAGS. |
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# This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations. |
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KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS)) |
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# KVM nVHE code is run at a different exception code with a different map, so |
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# compiler instrumentation that inserts callbacks or checks into the code may |
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# cause crashes. Just disable it. |
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GCOV_PROFILE := n |
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KASAN_SANITIZE := n |
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UBSAN_SANITIZE := n |
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KCOV_INSTRUMENT := n |
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# Skip objtool checking for this directory because nVHE code is compiled with |
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# non-standard build rules. |
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OBJECT_FILES_NON_STANDARD := y
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