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# The instruction set the compiler should use when generating application
# code. The kernel is always compiled with arm code at present. arm code
# is the original 32 bit ARM instruction set, thumb code is the 16 bit
# encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size)
# but requires more instructions (140% for 70% smaller code) so may be
# slower.
TUNEVALID[thumb] = "Use thumb instructions instead of ARM"
ARM_THUMB_M_OPT = "${@['-marm', '-mthumb'][d.getVar('ARM_INSTRUCTION_SET', True) == 'thumb']}"
TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ' ${ARM_THUMB_M_OPT}', '', d)}"
OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'thumb', ':thumb', '', d)}"
ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', [ 'armv4', 'thumb' ], 't', '', d)}"
ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', [ 'armv5', 'thumb' ], 't', '', d)}"
ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', [ 'armv6', 'thumb' ], 't', '', d)}"
ARMPKGSFX_THUMB .= "${@bb.utils.contains('TUNE_FEATURES', [ 'armv7a', 'thumb' ], 't2', '', d)}"
# Whether to compile with code to allow interworking between the two
# instruction sets. This allows thumb code to be executed on a primarily
# arm system and vice versa. It is strongly recommended that DISTROs not
# turn this off - the actual cost is very small.
TUNEVALID[no-thumb-interwork] = "Disable mixing of thumb and ARM functions"
TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'no-thumb-interwork', ' -mno-thumb-interwork', ' -mthumb-interwork', d)}"
OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'no-thumb-interwork', ':thumb-interwork', '', d)}"
TARGET_CC_KERNEL_ARCH += "-mno-thumb-interwork -marm"
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