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arch-arm64 is the base tune file for aarch64. Update this to allow the system to work with both aarch32 and aarch64 (multilib). arch-armv8 is for compatibility, it simply uses the base config for now. feature-arm-thumb was updated, since aarch64 mode does NOT have thumb support. We should only be processing warnings and additional arguments if thumb support is enabled on the processor core. (From OE-Core rev: 03d2f5646485b565cc14a0009b7d5224ab298f4c) Signed-off-by: Mark Hatle <mark.hatle@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
49 lines
2.9 KiB
HTML
49 lines
2.9 KiB
HTML
# The instruction set the compiler should use when generating application
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# code. The kernel is always compiled with arm code at present. arm code
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# is the original 32 bit ARM instruction set, thumb code is the 16 bit
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# encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size)
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# but requires more instructions (140% for 70% smaller code) so may be
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# slower.
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TUNEVALID[thumb] = "Use thumb instructions instead of ARM"
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ARM_THUMB_OPT = "${@['arm', 'thumb'][d.getVar('ARM_INSTRUCTION_SET', True) == 'thumb']}"
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ARM_THUMB_SUFFIX .= "${@bb.utils.contains('TUNE_FEATURES', 'armv4', 't', '', d)}"
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ARM_THUMB_SUFFIX .= "${@bb.utils.contains('TUNE_FEATURES', 'armv5', 't', '', d)}"
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ARM_THUMB_SUFFIX .= "${@bb.utils.contains('TUNE_FEATURES', 'armv6', 't', '', d)}"
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ARM_THUMB_SUFFIX .= "${@bb.utils.contains('TUNE_FEATURES', 'armv7a', 't2', '', d)}"
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ARM_THUMB_SUFFIX .= "${@bb.utils.contains('TUNE_FEATURES', 'armv7r', 't2', '', d)}"
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ARM_THUMB_SUFFIX .= "${@bb.utils.contains('TUNE_FEATURES', 'armv7m', 't2', '', d)}"
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# If the device supports ARM, then respect ARM_THUMB_OPT (which can be "arm" or "thumb")
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# If the defice doesn't support ARM, then always set "thumb" even when
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# some recipe explicitly sets ARM_INSTRUCTION_SET to "arm"
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ARM_M_OPT = "${@bb.utils.contains('TUNE_FEATURES', 'arm', '${ARM_THUMB_OPT}', 'thumb', d)}"
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python () {
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if bb.utils.contains('TUNE_FEATURES', 'thumb', 'False', 'True', d):
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return
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selected = d.getVar('ARM_INSTRUCTION_SET', True)
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if selected == None:
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return
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used = d.getVar('ARM_M_OPT', True)
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if selected != used:
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pn = d.getVar('PN', True)
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bb.warn("Recipe '%s' selects ARM_INSTRUCTION_SET to be '%s', but tune configuration overrides it to '%s'" % (pn, selected, used))
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}
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TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' -m${ARM_M_OPT}', '', d)}"
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OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ':thumb', '', d)}"
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ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '${ARM_THUMB_SUFFIX}', '', d)}"
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# Whether to compile with code to allow interworking between the two
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# instruction sets. This allows thumb code to be executed on a primarily
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# arm system and vice versa. It is strongly recommended that DISTROs not
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# turn this off - the actual cost is very small.
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TUNEVALID[no-thumb-interwork] = "Disable mixing of thumb and ARM functions"
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THUMB_TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'no-thumb-interwork', ' -mno-thumb-interwork', ' -mthumb-interwork', d)}"
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THUMB_OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'no-thumb-interwork', ':thumb-interwork', '', d)}"
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TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' ${THUMB_TUNE_CCARGS}', '', d)}"
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OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' ${THUMB_OVERRIDES}', '', d)}"
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# what about armv7m devices which don't support -marm (e.g. Cortex-M3)?
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TARGET_CC_KERNEL_ARCH += "${@bb.utils.contains('TUNE_FEATURES', 'thumb', '-mno-thumb-interwork -marm', '', d)}"
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