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mips: add a tune for using MIPS16e ASE instructions 

The MIPS16e instruction set still has to be enabled by setting
MIPS_INSTRUCTION_SET = 'mips16e'
in e.g. distro.conf and can be disabled on a per-recipe basis as
needed.

This is a similar approach as is available on ARM for Thumb support.

Note that contrary to the ARM Thumb support in OE, we do add a new
OVERRIDE (mips16e), as there are some recipes in OE that need to be
compiled slightly differently if mips16e mode is requested.

(From OE-Core rev: e9d8b02a42eb08802e202770409cb5378b79b281)

Signed-off-by: André Draszik <adraszik@tycoint.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
André Draszik 2016-06-10 16:12:38 +01:00 committed by Richard Purdie
parent ef35facd96
commit 7acb3db0b1
1 changed files with 17 additions and 0 deletions
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17
meta/conf/machine/include/mips/feature-mips-mips16e.inc Normal file
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TUNEVALID[mips16e] = "Build target packages with MIPS16e ASE instructions"
MIPS_MIPS16E_OPT = "${@['mno-mips16', 'mips16'][d.getVar('MIPS_INSTRUCTION_SET', True) == 'mips16e']}"
TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'mips16e', ' -${MIPS_MIPS16E_OPT}', '', d)}"
MIPSPKGSFX_MIPS16E .= "${@bb.utils.contains('TUNE_FEATURES', 'mips16e', '-m16', '', d) if d.getVar('MIPS_MIPS16E_OPT', True) == 'mips16' else ''}"
# Whether to compile with code to allow interworking between the two
# instruction sets. This allows mips16e code to be executed on a primarily
# mips32/64 system and vice versa. It is strongly recommended that DISTROs not
# turn this off - the actual cost is very small.
TUNEVALID[no-interlink-compressed] = "Disable mixing of standard and MIPS16e code"
MIPS16_TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'no-interlink-compressed', ' -mno-interlink-compressed', ' -minterlink-compressed', d)}"
TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'mips16e', ' ${MIPS16_TUNE_CCARGS}', '', d)}"
OVERRIDES .= "${@bb.utils.contains('TUNE_FEATURES', 'mips16e', ':mips16e', '', d)}"
# show status (if compiling in MIPS16e mode)
BUILDCFG_VARS += "${@['', 'MIPS_INSTRUCTION_SET'][d.getVar('MIPS_INSTRUCTION_SET', True) == 'mips16e']}"