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118 lines
3.5 KiB
Plaintext
118 lines
3.5 KiB
Plaintext
# ARM specific configuration file
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## no-package
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## select ARCH_SUPPORTS_32
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## select ARCH_SUPPORTS_64
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## select ARCH_DEFAULT_32
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## select ARCH_SUPPORTS_BOTH_MMU
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## select ARCH_DEFAULT_HAS_MMU
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## select ARCH_SUPPORTS_FLAT_FORMAT
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## select ARCH_SUPPORTS_EITHER_ENDIAN
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## select ARCH_DEFAULT_LE
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## select ARCH_SUPPORTS_WITH_ARCH
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## select ARCH_SUPPORTS_WITH_CPU
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## select ARCH_EXCLUSIVE_WITH_CPU
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## select ARCH_SUPPORTS_WITH_TUNE
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## select ARCH_SUPPORTS_WITH_FLOAT if ARCH_32
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## select ARCH_SUPPORTS_WITH_FPU if ARCH_32
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## select ARCH_SUPPORTS_SOFTFP if ARCH_32
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## select LINUX_REQUIRE_3_7_or_later if ARCH_64 && KERNEL_LINUX
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## help The ARM architecture, as defined by:
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## help http://www.arm.com/
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if ARCH_32
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config ARCH_ARM_MODE
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string
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default "arm" if ARCH_ARM_MODE_ARM
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default "thumb" if ARCH_ARM_MODE_THUMB
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choice
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bool
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prompt "Default instruction set mode"
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default ARCH_ARM_MODE_ARM
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config ARCH_ARM_MODE_ARM
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bool
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prompt "arm"
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help
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Defaults to emitting instructions in the ARM mode.
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config ARCH_ARM_MODE_THUMB
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bool
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prompt "thumb"
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help
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Defaults to emitting instructions in the THUMB mode.
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endchoice
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config ARCH_ARM_INTERWORKING
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bool
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prompt "Use Thumb-interworking (READ HELP)"
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help
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Excerpt from the gcc manual:
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> Generate code which supports calling between the ARM and Thumb
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> instruction sets. Without this option the two instruction sets
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> cannot be reliably used inside one program. The default is
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> [not to use interwork], since slightly larger code is generated
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> when [interwork] is specified.
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NOTE: Interworking in crosstool-NG is not well-tested. Use at your
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own risks, and report success and/or failure.
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# Until we only support EABI:
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config ARCH_ARM_ABI_OK
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def_bool y
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depends on ! ARCH_ARM_EABI
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select ARCH_SUPPORTS_WITH_ABI
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# Little trick to force EABI *and* always show the prompt
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config ARCH_ARM_EABI_FORCE
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bool
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default y if ! OBSOLETE
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select ARCH_ARM_EABI
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config ARCH_ARM_EABI
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bool
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prompt "Use EABI"
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default y
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help
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Set up the toolchain so that it generates EABI-compliant binaries.
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If you say 'n' here, then the toolchain will generate OABI binaries.
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OABI has long been deprecated, and is now considered legacy.
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config ARCH_ARM_TUPLE_USE_EABIHF
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bool
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prompt "append 'hf' to the tuple (EXPERIMENTAL)"
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depends on ARCH_FLOAT_HW
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depends on ARCH_ARM_EABI # Until we only support that...
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default y
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help
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Is you say 'y' here, then the tuple for the toolchain will end
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up with *eabihf, instead of the usual *eabi.
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*eabihf is used to denote that the toolchain *is* using the
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hard-float ABI, while *eabi is just an indication of using the
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soft-float ABI.
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Ie. all one can say is: *eabihf ⊢ hard-float ABI
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Saying 'n' here does *not* impact the ability of the toolchain to
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generate hard-float instructions with the hard-float ABI. It is a
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purely cosmetic thing, used by distros to differentiate their
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hard-float-ABI-using ports from their soft-float-ABI-using ports.
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(eg. Debian Wheezy and above).
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This is an option, as not all versions of gcc/binutils do support
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such tuple, and fail to build with *eabihf. Stock gcc version up
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to, and including 4.7.2 have an issue or another with *eabihf.
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This option is here for the future.
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Say 'n', unless you are trying to fix gcc to properly recognise
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the *eabihf tuples.
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endif
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