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| author | H. J. Lu <hjl.tools@gmail.com> | 2012-02-19 19:40:03 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2012-02-20 21:52:06 +0100 |
| commit | 5fd92e65a68b813667bc8739f5fa463e5bfcd66d (patch) | |
| tree | a80efcac66b412d0792646182dcffdf6426607ed /arch | |
| parent | x32: If configured, add x32 system calls to system call tables (diff) | |
| download | linux-5fd92e65a68b813667bc8739f5fa463e5bfcd66d.tar.xz linux-5fd92e65a68b813667bc8739f5fa463e5bfcd66d.zip | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5bed94e189fa..c9d6c9ed27e5 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2165,9 +2165,9 @@ config IA32_EMULATION depends on X86_64 select COMPAT_BINFMT_ELF ---help--- - Include code to run 32-bit programs under a 64-bit kernel. You should - likely turn this on, unless you're 100% sure that you don't have any - 32-bit programs left. + Include code to run legacy 32-bit programs under a + 64-bit kernel. You should likely turn this on, unless you're + 100% sure that you don't have any 32-bit programs left. config IA32_AOUT tristate "IA32 a.out support" @@ -2175,9 +2175,22 @@ config IA32_AOUT ---help--- Support old a.out binaries in the 32bit emulation. +config X86_X32_ABI + bool "x32 ABI for 64-bit mode (EXPERIMENTAL)" + depends on X86_64 && IA32_EMULATION && EXPERIMENTAL + ---help--- + Include code to run binaries for the x32 native 32-bit ABI + for 64-bit processors. An x32 process gets access to the + full 64-bit register file and wide data path while leaving + pointers at 32 bits for smaller memory footprint. + + You will need a recent binutils (2.22 or later) with + elf32_x86_64 support enabled to compile a kernel with this + option set. + config COMPAT def_bool y - depends on IA32_EMULATION + depends on IA32_EMULATION || X86_X32_ABI config COMPAT_FOR_U64_ALIGNMENT def_bool COMPAT |