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authorMarcin Juszkiewicz <hrw@openedhand.com>2007-12-19 12:01:17 +0000
committerMarcin Juszkiewicz <hrw@openedhand.com>2007-12-19 12:01:17 +0000
commit994be9eaf4ff1c4911451ccdea9346f2a4d345af (patch)
tree32e99ff59c5887790015d00d2a6caefab1c62478 /meta/conf
parent2f039d93e367e94e7c1f4d729dcd93abf6a3b9d2 (diff)
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tune-thumb: switch ARM/Thumb instruction set (from OE)
git-svn-id: https://svn.o-hand.com/repos/poky/trunk@3356 311d38ba-8fff-0310-9ca6-ca027cbcb966
Diffstat (limited to 'meta/conf')
-rw-r--r--meta/conf/machine/include/tune-thumb.inc32
1 files changed, 32 insertions, 0 deletions
diff --git a/meta/conf/machine/include/tune-thumb.inc b/meta/conf/machine/include/tune-thumb.inc
new file mode 100644
index 000000000..a25cb5320
--- /dev/null
+++ b/meta/conf/machine/include/tune-thumb.inc
@@ -0,0 +1,32 @@
+#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 ?= "yes"
+# "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 .= "${OVERRIDE_THUMB}${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 += "${ARM_INTERWORK_M_OPT} ${ARM_THUMB_M_OPT}"
+TARGET_CC_KERNEL_ARCH += "-mno-thumb-interwork -mno-thumb"
+