1 #tune file for thumb instructions
3 ARM_INSTRUCTION_SET ?= "arm"
5 # The instruction set the compiler should use when generating application
6 # code. The kernel is always compiled with arm code at present. arm code
7 # is the original 32 bit ARM instruction set, thumb code is the 16 bit
8 # encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size)
9 # but requires more instructions (140% for 70% smaller code) so may be
12 THUMB_INTERWORK ?= "no"
14 # Whether to compile with code to allow interworking between the two
15 # instruction sets. This allows thumb code to be executed on a primarily
16 # arm system and vice versa. It is strongly recommended that DISTROs not
17 # turn this off - the actual cost is very small.
19 OVERRIDE_THUMB = "${@['', ':thumb'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) == 'thumb']}"
20 OVERRIDE_INTERWORK = "${@['', ':thumb-interwork'][bb.data.getVar('THUMB_INTERWORK', d, 1) == 'yes']}"
21 OVERRIDES .= "${OVERRIDE_THUMB}${OVERRIDE_INTERWORK}"
23 # Compiler and linker options for application code and kernel code. These
24 # options ensure that the compiler has the correct settings for the selected
25 # instruction set and interworking.
26 ARM_INTERWORK_M_OPT = "${@['-mno-thumb-interwork', '-mthumb-interwork'][bb.data.getVar('THUMB_INTERWORK', d, 1) == 'yes']}"
27 ARM_THUMB_M_OPT = "${@['-mno-thumb', '-mthumb'][bb.data.getVar('ARM_INSTRUCTION_SET', d, 1) == 'thumb']}"
30 TARGET_CC_ARCH += "${ARM_INTERWORK_M_OPT} ${ARM_THUMB_M_OPT}"
31 TARGET_CC_KERNEL_ARCH += "-mno-thumb-interwork -mno-thumb"