forked from Minki/linux
e71a4e1beb
Currently, dynamic ftrace support in the arm64 kernel assumes that all core kernel code is within range of ordinary branch instructions that occur in module code, which is usually the case, but is no longer guaranteed now that we have support for module PLTs and address space randomization. Since on arm64, all patching of branch instructions involves function calls to the same entry point [ftrace_caller()], we can emit the modules with a trampoline that has unlimited range, and patch both the trampoline itself and the branch instruction to redirect the call via the trampoline. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [will: minor clarification to smp_wmb() comment] Signed-off-by: Will Deacon <will.deacon@arm.com>
68 lines
2.5 KiB
Makefile
68 lines
2.5 KiB
Makefile
#
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# Makefile for the linux kernel.
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#
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CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET)
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AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
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CFLAGS_armv8_deprecated.o := -I$(src)
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CFLAGS_REMOVE_ftrace.o = -pg
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CFLAGS_REMOVE_insn.o = -pg
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CFLAGS_REMOVE_return_address.o = -pg
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CFLAGS_setup.o = -DUTS_MACHINE='"$(UTS_MACHINE)"'
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# Object file lists.
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arm64-obj-y := debug-monitors.o entry.o irq.o fpsimd.o \
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entry-fpsimd.o process.o ptrace.o setup.o signal.o \
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sys.o stacktrace.o time.o traps.o io.o vdso.o \
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hyp-stub.o psci.o cpu_ops.o insn.o \
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return_address.o cpuinfo.o cpu_errata.o \
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cpufeature.o alternative.o cacheinfo.o \
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smp.o smp_spin_table.o topology.o smccc-call.o
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extra-$(CONFIG_EFI) := efi-entry.o
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OBJCOPYFLAGS := --prefix-symbols=__efistub_
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$(obj)/%.stub.o: $(obj)/%.o FORCE
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$(call if_changed,objcopy)
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arm64-obj-$(CONFIG_COMPAT) += sys32.o kuser32.o signal32.o \
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sys_compat.o entry32.o
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arm64-obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o
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arm64-obj-$(CONFIG_MODULES) += arm64ksyms.o module.o
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arm64-obj-$(CONFIG_ARM64_MODULE_PLTS) += module-plts.o
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arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o
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arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
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arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
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arm64-obj-$(CONFIG_CPU_PM) += sleep.o suspend.o
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arm64-obj-$(CONFIG_CPU_IDLE) += cpuidle.o
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arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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arm64-obj-$(CONFIG_KGDB) += kgdb.o
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arm64-obj-$(CONFIG_EFI) += efi.o efi-entry.stub.o
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arm64-obj-$(CONFIG_PCI) += pci.o
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arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o
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arm64-obj-$(CONFIG_ACPI) += acpi.o
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arm64-obj-$(CONFIG_ACPI_NUMA) += acpi_numa.o
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arm64-obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL) += acpi_parking_protocol.o
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arm64-obj-$(CONFIG_PARAVIRT) += paravirt.o
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arm64-obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
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arm64-obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate-asm.o
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arm64-obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o \
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cpu-reset.o
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arm64-obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o
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arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o
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arm64-obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-y += $(arm64-obj-y) vdso/ probes/
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obj-m += $(arm64-obj-m)
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head-y := head.o
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extra-y += $(head-y) vmlinux.lds
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ifeq ($(CONFIG_DEBUG_EFI),y)
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AFLAGS_head.o += -DVMLINUX_PATH="\"$(realpath $(objtree)/vmlinux)\""
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endif
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# will be included by each individual module but not by the core kernel itself
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extra-$(CONFIG_DYNAMIC_FTRACE) += ftrace-mod.o
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