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Message-Id: <20241204102904.1863796-3-arnd@kernel.org> Date: Wed, 4 Dec 2024 11:28:51 +0100 From: Arnd Bergmann <arnd@...nel.org> To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org Cc: Arnd Bergmann <arnd@...db.de>, Aaro Koskinen <aaro.koskinen@....fi>, Andrew Lunn <andrew@...n.ch>, Ard Biesheuvel <ardb@...nel.org>, Daniel Mack <daniel@...que.org>, Gregory Clement <gregory.clement@...tlin.com>, Haojian Zhuang <haojian.zhuang@...il.com>, "Jeremy J. Peper" <jeremy@...emypeper.com>, Kristoffer Ericson <kristoffer.ericson@...il.com>, Krzysztof Kozlowski <krzk@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, Mark Brown <broonie@...nel.org>, Ralph Siemsen <ralph.siemsen@...aro.org>, Robert Jarzmik <robert.jarzmik@...e.fr>, Russell King <linux@...linux.org.uk>, Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>, Tony Lindgren <tony@...mide.com> Subject: [PATCH 02/15] ARM: limit OABI support to StrongARM CPUs From: Arnd Bergmann <arnd@...db.de> As discussed on the mailing lists, there is no way to build OABI userspace binaries any more since gcc-4.8, and now support is also getting dropped in binutils, which will make it impossible to build pure OABI kernels at some point in the future. I found no evidence of anyone still sing OABI userspace on embedded systems that keep getting kernel updates, but there are a few desktop-class machines that date back to the 1990s using Intel StrongARM processors that were supported by old versions of Debian, Red Hat or the official Corel Netwinder distribution. Add a much stricter Kconfig dependency for both native OABI and OABI_COMPAT enabled kernels, only allowing either of them to be selected when building a kernel that targets a StrongARM based machine. Link: https://lore.kernel.org/lkml/2831c5a6-cfbf-4fe0-b51c-0396e5b0aeb7@app.fastmail.com/ Signed-off-by: Arnd Bergmann <arnd@...db.de> --- arch/arm/Kconfig | 14 +++++++------- arch/arm/configs/am200epdkit_defconfig | 1 - arch/arm/configs/axm55xx_defconfig | 1 - arch/arm/configs/footbridge_defconfig | 2 +- arch/arm/configs/neponset_defconfig | 2 +- arch/arm/configs/versatile_defconfig | 1 - 6 files changed, 9 insertions(+), 12 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index f8f127650ace..54f5cc12dea4 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1161,8 +1161,7 @@ config ARM_PATCH_IDIV code to do integer division. config AEABI - bool "Use the ARM EABI to compile the kernel" if !CPU_V7 && \ - !CPU_V7M && !CPU_V6 && !CPU_V6K && !CC_IS_CLANG + bool "Use the ARM EABI to compile the kernel" if CPU_SA110 || CPU_SA1100 default y help The Arm EABI is the default ABI on all modern Linux @@ -1172,9 +1171,13 @@ config AEABI Everyone should enable this, as support for OABI user space was dropped in gcc-4.8 and most distributions after ca. 2013. + Support for OABI mode will be removed from the kernel + once Intel StrongARM CPUs are phased out. + config OABI_COMPAT bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" depends on AEABI && !THUMB2_KERNEL + depends on CPU_SA110 || CPU_SA1100 help This option preserves the old syscall interface along with the new (ARM EABI) one. It also provides a compatibility layer to @@ -1187,11 +1190,8 @@ config OABI_COMPAT selected, since there is no way yet to sensibly distinguish between calling conventions during filtering. - If you know you'll be using only pure EABI user space then you - can say N here. If this option is not selected and you attempt - to execute a legacy ABI binary then the result will be - UNPREDICTABLE (in fact it can be predicted that it won't work - at all). If in doubt say N. + Support for OABI_COMPAT will be removed from the kernel + once Intel StrongARM CPUs are phased out. config ARCH_SELECT_MEMORY_MODEL def_bool y diff --git a/arch/arm/configs/am200epdkit_defconfig b/arch/arm/configs/am200epdkit_defconfig index 22397d45f4a0..55c5c08a5f96 100644 --- a/arch/arm/configs/am200epdkit_defconfig +++ b/arch/arm/configs/am200epdkit_defconfig @@ -7,7 +7,6 @@ CONFIG_EXPERT=y # CONFIG_ARCH_MULTI_V7 is not set CONFIG_ARCH_PXA=y CONFIG_ARCH_GUMSTIX=y -# CONFIG_OABI_COMPAT is not set CONFIG_CMDLINE="console=ttyS0,115200n8 root=1f01 rootfstype=jffs2" CONFIG_MODULES=y CONFIG_MODULE_UNLOAD=y diff --git a/arch/arm/configs/axm55xx_defconfig b/arch/arm/configs/axm55xx_defconfig index 39b06d59d87a..9d14b987ee94 100644 --- a/arch/arm/configs/axm55xx_defconfig +++ b/arch/arm/configs/axm55xx_defconfig @@ -38,7 +38,6 @@ CONFIG_PCIE_AXXIA=y CONFIG_SMP=y CONFIG_NR_CPUS=16 CONFIG_HOTPLUG_CPU=y -CONFIG_OABI_COMPAT=y CONFIG_HIGHMEM=y CONFIG_ARM_APPENDED_DTB=y CONFIG_ARM_ATAG_DTB_COMPAT=y diff --git a/arch/arm/configs/footbridge_defconfig b/arch/arm/configs/footbridge_defconfig index 589b7b1df8c6..e8bf9847d35d 100644 --- a/arch/arm/configs/footbridge_defconfig +++ b/arch/arm/configs/footbridge_defconfig @@ -9,9 +9,9 @@ CONFIG_ARCH_MULTI_V4=y CONFIG_ARCH_FOOTBRIDGE=y CONFIG_ARCH_EBSA285_HOST=y CONFIG_ARCH_NETWINDER=y +# CONFIG_AEABI is not set CONFIG_FPE_NWFPE=y CONFIG_FPE_NWFPE_XP=y -# CONFIG_AEABI is not set CONFIG_MODULES=y CONFIG_PARTITION_ADVANCED=y CONFIG_ACORN_PARTITION=y diff --git a/arch/arm/configs/neponset_defconfig b/arch/arm/configs/neponset_defconfig index a8833b2ce335..7a7b6a896f85 100644 --- a/arch/arm/configs/neponset_defconfig +++ b/arch/arm/configs/neponset_defconfig @@ -6,12 +6,12 @@ CONFIG_ARCH_MULTI_V4=y CONFIG_ARCH_SA1100=y CONFIG_SA1100_ASSABET=y CONFIG_ASSABET_NEPONSET=y +# CONFIG_AEABI is not set CONFIG_ZBOOT_ROM_TEXT=0x80000 CONFIG_ZBOOT_ROM_BSS=0xc1000000 CONFIG_ZBOOT_ROM=y CONFIG_CMDLINE="console=ttySA0,38400n8 cpufreq=221200 rw root=/dev/mtdblock2 mtdparts=sa1100:512K(boot),1M(kernel),2560K(initrd),4M(root) load_ramdisk=1 prompt_ramdisk=0 mem=32M noinitrd initrd=0xc0800000,3M" CONFIG_FPE_NWFPE=y -# CONFIG_AEABI is not set CONFIG_PM=y CONFIG_MODULES=y CONFIG_MODULE_UNLOAD=y diff --git a/arch/arm/configs/versatile_defconfig b/arch/arm/configs/versatile_defconfig index 8e89debb5a5b..bb9eb9ccbbde 100644 --- a/arch/arm/configs/versatile_defconfig +++ b/arch/arm/configs/versatile_defconfig @@ -6,7 +6,6 @@ CONFIG_LOG_BUF_SHIFT=14 CONFIG_BLK_DEV_INITRD=y # CONFIG_ARCH_MULTI_V7 is not set CONFIG_ARCH_VERSATILE=y -CONFIG_OABI_COMPAT=y CONFIG_CMDLINE="root=1f03 mem=32M" CONFIG_FPE_NWFPE=y CONFIG_VFP=y -- 2.39.5
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