x32: Allow x32 to be configured
At this point, one should be able to build an x32 kernel. Note that for now we depend on CONFIG_IA32_EMULATION. Long term, x32 and IA32 should be detangled. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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@ -2165,9 +2165,9 @@ config IA32_EMULATION
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depends on X86_64
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select COMPAT_BINFMT_ELF
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---help---
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Include code to run 32-bit programs under a 64-bit kernel. You should
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likely turn this on, unless you're 100% sure that you don't have any
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32-bit programs left.
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Include code to run legacy 32-bit programs under a
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64-bit kernel. You should likely turn this on, unless you're
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100% sure that you don't have any 32-bit programs left.
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config IA32_AOUT
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tristate "IA32 a.out support"
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@ -2175,9 +2175,22 @@ config IA32_AOUT
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---help---
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Support old a.out binaries in the 32bit emulation.
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config X86_X32_ABI
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bool "x32 ABI for 64-bit mode (EXPERIMENTAL)"
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depends on X86_64 && IA32_EMULATION && EXPERIMENTAL
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---help---
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Include code to run binaries for the x32 native 32-bit ABI
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for 64-bit processors. An x32 process gets access to the
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full 64-bit register file and wide data path while leaving
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pointers at 32 bits for smaller memory footprint.
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You will need a recent binutils (2.22 or later) with
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elf32_x86_64 support enabled to compile a kernel with this
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option set.
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config COMPAT
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def_bool y
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depends on IA32_EMULATION
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depends on IA32_EMULATION || X86_X32_ABI
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config COMPAT_FOR_U64_ALIGNMENT
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def_bool COMPAT
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