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Kbuild puts the objects listed in head-y at the head of vmlinux. Conventionally, we do this for head*.S, which contains the kernel entry point. A counter approach is to control the section order by the linker script. Actually, the code marked as __HEAD goes into the ".head.text" section, which is placed before the normal ".text" section. I do not know if both of them are needed. From the build system perspective, head-y is not mandatory. If you can achieve the proper code placement by the linker script only, it would be cleaner. I collected the current head-y objects into head-object-list.txt. It is a whitelist. My hope is it will be reduced in the long run. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
54 lines
1.6 KiB
Plaintext
54 lines
1.6 KiB
Plaintext
# Head objects
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#
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# The objects listed here are placed at the head of vmlinux. A typical use-case
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# is an object that contains the entry point. This is kept for compatibility
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# with head-y, which Kbuild used to support.
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#
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# A counter approach is to control the section placement by the linker script.
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# The code marked as __HEAD goes into the ".head.text" section, which is placed
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# before the normal ".text" section.
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#
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# If you can achieve the correct code ordering by linker script, please delete
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# the entry from this file.
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#
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arch/alpha/kernel/head.o
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arch/arc/kernel/head.o
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arch/arm/kernel/head-nommu.o
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arch/arm/kernel/head.o
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arch/arm64/kernel/head.o
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arch/csky/kernel/head.o
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arch/hexagon/kernel/head.o
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arch/ia64/kernel/head.o
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arch/loongarch/kernel/head.o
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arch/m68k/68000/head.o
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arch/m68k/coldfire/head.o
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arch/m68k/kernel/head.o
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arch/m68k/kernel/sun3-head.o
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arch/microblaze/kernel/head.o
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arch/mips/kernel/head.o
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arch/nios2/kernel/head.o
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arch/openrisc/kernel/head.o
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arch/parisc/kernel/head.o
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arch/powerpc/kernel/head_40x.o
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arch/powerpc/kernel/head_44x.o
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arch/powerpc/kernel/head_64.o
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arch/powerpc/kernel/head_8xx.o
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arch/powerpc/kernel/head_book3s_32.o
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arch/powerpc/kernel/head_fsl_booke.o
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arch/powerpc/kernel/entry_64.o
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arch/powerpc/kernel/fpu.o
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arch/powerpc/kernel/vector.o
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arch/powerpc/kernel/prom_init.o
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arch/riscv/kernel/head.o
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arch/s390/kernel/head64.o
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arch/sh/kernel/head_32.o
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arch/sparc/kernel/head_32.o
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arch/sparc/kernel/head_64.o
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arch/x86/kernel/head_32.o
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arch/x86/kernel/head_64.o
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arch/x86/kernel/head32.o
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arch/x86/kernel/head64.o
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arch/x86/kernel/ebda.o
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arch/x86/kernel/platform-quirks.o
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arch/xtensa/kernel/head.o
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