3216484550
The objects placed at the head of vmlinux need special treatments: - arch/$(SRCARCH)/Makefile adds them to head-y in order to place them before other archives in the linker command line. - arch/$(SRCARCH)/kernel/Makefile adds them to extra-y instead of obj-y to avoid them going into built-in.a. This commit gets rid of the latter. Create vmlinux.a to collect all the objects that are unconditionally linked to vmlinux. The objects listed in head-y are moved to the head of vmlinux.a by using 'ar m'. With this, arch/$(SRCARCH)/kernel/Makefile can consistently use obj-y for builtin objects. There is no *.o that is directly linked to vmlinux. Drop unneeded code in scripts/clang-tools/gen_compile_commands.py. $(AR) mPi needs 'T' to workaround the llvm-ar bug. The fix was suggested by Nathan Chancellor [1]. [1]: https://lore.kernel.org/llvm/YyjjT5gQ2hGMH0ni@dev-arch.thelio-3990X/ Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
112 lines
3.5 KiB
Makefile
112 lines
3.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the linux kernel.
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#
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CPPFLAGS_vmlinux.lds := -DTEXT_OFFSET=$(TEXT_OFFSET)
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AFLAGS_head.o := -DTEXT_OFFSET=$(TEXT_OFFSET)
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_ftrace.o = -pg
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CFLAGS_REMOVE_insn.o = -pg
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CFLAGS_REMOVE_patch.o = -pg
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CFLAGS_REMOVE_unwind.o = -pg
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endif
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CFLAGS_REMOVE_return_address.o = -pg
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# Object file lists.
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obj-y := elf.o entry-common.o irq.o opcodes.o \
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process.o ptrace.o reboot.o io.o \
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setup.o signal.o sigreturn_codes.o \
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stacktrace.o sys_arm.o time.o traps.o
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KASAN_SANITIZE_stacktrace.o := n
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KASAN_SANITIZE_traps.o := n
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ifneq ($(CONFIG_ARM_UNWIND),y)
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obj-$(CONFIG_FRAME_POINTER) += return_address.o
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endif
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obj-$(CONFIG_ATAGS) += atags_parse.o
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obj-$(CONFIG_ATAGS_PROC) += atags_proc.o
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obj-$(CONFIG_DEPRECATED_PARAM_STRUCT) += atags_compat.o
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ifeq ($(CONFIG_CPU_V7M),y)
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obj-y += entry-v7m.o v7m.o
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else
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obj-y += entry-armv.o
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endif
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obj-$(CONFIG_MMU) += bugs.o
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obj-$(CONFIG_CPU_IDLE) += cpuidle.o
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obj-$(CONFIG_ISA_DMA_API) += dma.o
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obj-$(CONFIG_FIQ) += fiq.o fiqasm.o
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obj-$(CONFIG_MODULES) += armksyms.o module.o
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obj-$(CONFIG_ARM_MODULE_PLTS) += module-plts.o
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obj-$(CONFIG_ISA_DMA) += dma-isa.o
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obj-$(CONFIG_PCI) += bios32.o isa.o
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obj-$(CONFIG_ARM_CPU_SUSPEND) += sleep.o suspend.o
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obj-$(CONFIG_HIBERNATION) += hibernate.o
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obj-$(CONFIG_SMP) += smp.o
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ifdef CONFIG_MMU
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obj-$(CONFIG_SMP) += smp_tlb.o
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endif
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obj-$(CONFIG_HAVE_ARM_SCU) += smp_scu.o
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obj-$(CONFIG_HAVE_ARM_TWD) += smp_twd.o
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obj-$(CONFIG_ARM_ARCH_TIMER) += arch_timer.o
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obj-$(CONFIG_FUNCTION_TRACER) += entry-ftrace.o
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obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o insn.o patch.o
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obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o insn.o patch.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o insn.o patch.o
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obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
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# Main staffs in KPROBES are in arch/arm/probes/ .
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obj-$(CONFIG_KPROBES) += patch.o insn.o
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obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o
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obj-$(CONFIG_ARM_THUMBEE) += thumbee.o
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obj-$(CONFIG_KGDB) += kgdb.o patch.o
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obj-$(CONFIG_ARM_UNWIND) += unwind.o
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obj-$(CONFIG_HAVE_TCM) += tcm.o
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obj-$(CONFIG_OF) += devtree.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_SWP_EMULATE) += swp_emulate.o
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CFLAGS_swp_emulate.o := -Wa,-march=armv7-a
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obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
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obj-$(CONFIG_CPU_XSCALE) += xscale-cp0.o
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obj-$(CONFIG_CPU_XSC3) += xscale-cp0.o
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obj-$(CONFIG_CPU_MOHAWK) += xscale-cp0.o
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obj-$(CONFIG_CPU_PJ4) += pj4-cp0.o
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obj-$(CONFIG_CPU_PJ4B) += pj4-cp0.o
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obj-$(CONFIG_IWMMXT) += iwmmxt.o
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obj-$(CONFIG_PERF_EVENTS) += perf_regs.o perf_callchain.o
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obj-$(CONFIG_HW_PERF_EVENTS) += perf_event_xscale.o perf_event_v6.o \
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perf_event_v7.o
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AFLAGS_iwmmxt.o := -Wa,-mcpu=iwmmxt
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obj-$(CONFIG_ARM_CPU_TOPOLOGY) += topology.o
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obj-$(CONFIG_VDSO) += vdso.o
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obj-$(CONFIG_EFI) += efi.o
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obj-$(CONFIG_PARAVIRT) += paravirt.o
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obj-y += head$(MMUEXT).o
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obj-$(CONFIG_DEBUG_LL) += debug.o
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_ARM_PATCH_PHYS_VIRT) += phys2virt.o
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# This is executed very early using a temporary stack when no memory allocator
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# nor global data is available. Everything has to be allocated on the stack.
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CFLAGS_head-inflate-data.o := $(call cc-option,-Wframe-larger-than=10240)
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obj-$(CONFIG_XIP_DEFLATED_DATA) += head-inflate-data.o
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obj-$(CONFIG_ARM_VIRT_EXT) += hyp-stub.o
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AFLAGS_hyp-stub.o :=-Wa,-march=armv7-a
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ifeq ($(CONFIG_ARM_PSCI),y)
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obj-$(CONFIG_SMP) += psci_smp.o
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endif
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obj-$(CONFIG_HAVE_ARM_SMCCC) += smccc-call.o
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obj-$(CONFIG_GENERIC_CPU_VULNERABILITIES) += spectre.o
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extra-y := vmlinux.lds
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