From 06e2e88292e9ea6f5a23ead2e9c5ccf8bbd99e93 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Fri, 14 Feb 2014 17:55:18 +0000 Subject: [PATCH] MIPS: mark O32+FP64 experimental for now Commit 597ce1723e0f "MIPS: Support for 64-bit FP with O32 binaries" introduced support for setting Status.FR=1 for O32 binaries with the EF_MIPS_FP64 ELF header flag set. Whilst this flag is currently supported by binutils it does introduce an ABI break within userland. Objects built with EF_MIPS_FP64 cannot be safely linked with those built without it since code in either object may assume behaviour specific to a value of FR. More recently there has been discussion around avoiding further fragmentation of the O32 ABI whilst still allowing the use of FR=1 and features such as MSA which depend upon it. Details of the plan to allow this are still being worked on, and whilst the kernel will need the ability to handle FR=1 with O32 tasks it is unclear what else it may need to provide to a userland which seeks to avoid another ABI break. In order to prevent the proliferation of userland which may rely upon the current EF_MIPS_FP64 behaviour this patch marks the kernel support for it experimental & disables it by default. Under current proposals it is likely that this support can simply be enabled again later, but possibly after the introduction of further interfaces with userland and support for the MIPS R5 UFR feature. Signed-off-by: Paul Burton Cc: Matthew Fortune Cc: linux-mips@linux-mips.org Cc: Paul Burton Patchwork: https://patchwork.linux-mips.org/patch/6549/ Signed-off-by: Ralf Baechle --- arch/mips/Kconfig | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index dcae3a7..1534474 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2353,9 +2353,8 @@ config SECCOMP If unsure, say Y. Only embedded should say N here. config MIPS_O32_FP64_SUPPORT - bool "Support for O32 binaries using 64-bit FP" + bool "Support for O32 binaries using 64-bit FP (EXPERIMENTAL)" depends on 32BIT || MIPS32_O32 - default y help When this is enabled, the kernel will support use of 64-bit floating point registers with binaries using the O32 ABI along with the @@ -2367,7 +2366,14 @@ config MIPS_O32_FP64_SUPPORT of your kernel & potentially improve FP emulation performance by saying N here. - If unsure, say Y. + Although binutils currently supports use of this flag the details + concerning its effect upon the O32 ABI in userland are still being + worked on. In order to avoid userland becoming dependant upon current + behaviour before the details have been finalised, this option should + be considered experimental and only enabled by those working upon + said details. + + If unsure, say N. config USE_OF bool -- 2.7.4