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#tune file for thumb instructions
ARM_INSTRUCTION_SET ?= "arm"
# "arm" "thumb"
# 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.
THUMB_INTERWORK ?= "no"
# "yes" "no"
# 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.
OVERRIDE_THUMB = "${@['', 'thumb:'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) == 'thumb']}"
OVERRIDE_INTERWORK = "${@['', 'thumb-interwork:'][bb.data.getVar('THUMB_INTERWORK', d, 1) == 'yes']}"
OVERRIDES_prepend_arm =. "${OVERRIDE_THUMB}${OVERRIDE_INTERWORK}"
# Compiler and linker options for application code and kernel code. These
# options ensure that the compiler has the correct settings for the selected
# instruction set and interworking.
ARM_INTERWORK_M_OPT = "${@['-mno-thumb-interwork', '-mthumb-interwork'][bb.data.getVar('THUMB_INTERWORK', d, 1) == 'yes']}"
ARM_THUMB_M_OPT = "${@['-mno-thumb', '-mthumb'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) == 'thumb']}"
TARGET_CC_ARCH_append_arm =. " ${ARM_INTERWORK_M_OPT} ${ARM_THUMB_M_OPT}"
TARGET_CC_KERNEL_ARCH_append_arm =. " -mno-thumb-interwork -mno-thumb"
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