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