tjh.dev / kernel
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[ARM] 3112/1: old ABI compat: config option to turn it on

Patch from Nicolas Pitre

Enjoy !

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

authored by Nicolas Pitre and committed by Russell King 6c90c872 8993a44c

+17
unified split
+17
arch/arm/Kconfig
··· 416 416 417 417 To use this you need GCC version 4.0.0 or later. 418 418 419 + config OABI_COMPAT 420 + bool "Allow old ABI binaries to run with this kernel" 421 + depends on AEABI 422 + default y 423 + help 424 + This option preserves the old syscall interface along with the 425 + new (ARM EABI) one. It also provides a compatibility layer to 426 + intercept syscalls that have structure arguments which layout 427 + in memory differs between the legacy ABI and the new ARM EABI 428 + (only for non "thumb" binaries). This option adds a tiny 429 + overhead to all syscalls and produces a slightly larger kernel. 430 + If you know you'll be using only pure EABI user space then you 431 + can say N here. If this option is not selected and you attempt 432 + to execute a legacy ABI binary then the result will be 433 + UNPREDICTABLE (in fact it can be predicted that it won't work 434 + at all). If in doubt say Y. 435 + 419 436 config ARCH_DISCONTIGMEM_ENABLE 420 437 bool 421 438 default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM)