summaryrefslogtreecommitdiffstats
path: root/meta/conf/machine/include/arm/feature-arm-thumb.inc
diff options
context:
space:
mode:
Diffstat (limited to 'meta/conf/machine/include/arm/feature-arm-thumb.inc')
-rw-r--r--meta/conf/machine/include/arm/feature-arm-thumb.inc25
1 files changed, 25 insertions, 0 deletions
diff --git a/meta/conf/machine/include/arm/feature-arm-thumb.inc b/meta/conf/machine/include/arm/feature-arm-thumb.inc
new file mode 100644
index 0000000..fa3a4e5
--- /dev/null
+++ b/meta/conf/machine/include/arm/feature-arm-thumb.inc
@@ -0,0 +1,25 @@
1# The instruction set the compiler should use when generating application
2# code. The kernel is always compiled with arm code at present. arm code
3# is the original 32 bit ARM instruction set, thumb code is the 16 bit
4# encoded RISC sub-set. Thumb code is smaller (maybe 70% of the ARM size)
5# but requires more instructions (140% for 70% smaller code) so may be
6# slower.
7TUNEVALID[thumb] = "Use thumb instructions instead of ARM"
8ARM_THUMB_M_OPT = "${@['-marm', '-mthumb'][d.getVar('ARM_INSTRUCTION_SET', True) == 'thumb']}"
9TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "thumb", " ${ARM_THUMB_M_OPT}", "", d)}"
10OVERRIDES .= "${@bb.utils.contains("TUNE_FEATURES", "thumb", ":thumb", "", d)}"
11
12ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv4", "thumb" ], "t", "", d)}"
13ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv5", "thumb" ], "t", "", d)}"
14ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv6", "thumb" ], "t", "", d)}"
15ARMPKGSFX_THUMB .= "${@bb.utils.contains("TUNE_FEATURES", [ "armv7a", "thumb" ], "t2", "", d)}"
16
17# Whether to compile with code to allow interworking between the two
18# instruction sets. This allows thumb code to be executed on a primarily
19# arm system and vice versa. It is strongly recommended that DISTROs not
20# turn this off - the actual cost is very small.
21TUNEVALID[no-thumb-interwork] = "Disable mixing of thumb and ARM functions"
22TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "no-thumb-interwork", " -mno-thumb-interwork", " -mthumb-interwork", d)}"
23OVERRIDES .= "${@bb.utils.contains("TUNE_FEATURES", "no-thumb-interwork", ":thumb-interwork", "", d)}"
24
25TARGET_CC_KERNEL_ARCH += "-mno-thumb-interwork -marm"