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-rw-r--r--arch/x86/Kconfig21
1 files changed, 17 insertions, 4 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index abfb953c131d..1d14cc6b79ad 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2163,9 +2163,9 @@ 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"
@@ -2173,9 +2173,22 @@ config IA32_AOUT
---help---
Support old a.out binaries in the 32bit emulation.
+config X86_X32
+ 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
select ARCH_WANT_OLD_COMPAT_IPC
config COMPAT_FOR_U64_ALIGNMENT