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5e52c28397
On some CPU architecures it's possible to use MMU pages of different sizes, for example on ARC or ARM. And while for user-space applications the page size is supposed to be transparent, there's still some use of that extra information. In particular it's possible to align data structures or code/data sections on page boundary, etc. For these tricks to become possible tools which pack data (think of the linker, like GNU "ld") need to be informed of the page size to be considered. Obviously, there're some sane defaults which are being used most of the time, so we even think about that peculiarity, but when non-default value needs to be used, GNU "ld" accepts 2 properties related to page size: -z common-page-size=XXX -z max-page-size=YYY And while in thery those might be different (but always "common" <= "max"), and that might make sense if we build for some unknown platfrom, in case of Buildroot when we build entire target's filesystem and so know exactly the configuration we're targeting to, we may safely assume "common-page-size"="max-page-size". See a lengthy discussion in this thread [1]. Fixes: http://autobuild.buildroot.net/results/c8b2f331c98453670cd982558144c4fd84674a3d/ (uclibc) http://autobuild.buildroot.net/results/3a22f7aac38145b26c549254b819f87329e7a77e/ (glibc) And while at it, recover use of "XX-page-size" for ARC, as with [2] moving page size selection in the generic code we've got unexpected override for ARC (note "=", but not "+="): --------------------->8-------------------- ARCH_TOOLCHAIN_WRAPPER_OPTS = -matomic --------------------->8-------------------- [1] https://lists.buildroot.org/pipermail/buildroot/2022-July/646176.html [2] https://git.buildroot.net/buildroot/commit/?id=dcb74db89e74e512e36b32cea6f574a1a1ca84c4 Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
34 lines
1.5 KiB
Makefile
34 lines
1.5 KiB
Makefile
################################################################################
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#
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# Architecture-specific definitions
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#
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################################################################################
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# Allow GCC target configuration settings to be optionally
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# overwritten by architecture specific makefiles.
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# Makefiles must use the GCC_TARGET_* variables below instead
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# of the BR2_GCC_TARGET_* versions.
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GCC_TARGET_ARCH := $(call qstrip,$(BR2_GCC_TARGET_ARCH))
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GCC_TARGET_ABI := $(call qstrip,$(BR2_GCC_TARGET_ABI))
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GCC_TARGET_NAN := $(call qstrip,$(BR2_GCC_TARGET_NAN))
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GCC_TARGET_FP32_MODE := $(call qstrip,$(BR2_GCC_TARGET_FP32_MODE))
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GCC_TARGET_CPU := $(call qstrip,$(BR2_GCC_TARGET_CPU))
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GCC_TARGET_FPU := $(call qstrip,$(BR2_GCC_TARGET_FPU))
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GCC_TARGET_FLOAT_ABI := $(call qstrip,$(BR2_GCC_TARGET_FLOAT_ABI))
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GCC_TARGET_MODE := $(call qstrip,$(BR2_GCC_TARGET_MODE))
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# Explicitly set LD's "max-page-size" instead of relying on some defaults
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ifeq ($(BR2_ARC_PAGE_SIZE_4K)$(BR2_ARM64_PAGE_SIZE_4K),y)
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ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
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else ifeq ($(BR2_ARC_PAGE_SIZE_8K),y)
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ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=8192 -Wl,-z,common-page-size=8192
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else ifeq ($(BR2_ARC_PAGE_SIZE_16K),y)
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ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=16384 -Wl,-z,common-page-size=16384
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else ifeq ($(BR2_ARM64_PAGE_SIZE_64K),y)
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ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=65536 -Wl,-z,common-page-size=65536
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endif
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# Include any architecture specific makefiles.
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-include $(sort $(wildcard arch/arch.mk.*))
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