path: root/arch
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authorPaul Mundt <lethal@linux-sh.org>2007-11-21 17:58:13 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-01-28 13:18:53 +0900
commit1e1ed39faec635b109ff8c516377310600623674 (patch)
tree2c751c9a642f399e2cf5b03aca64ed57f01700b2 /arch
parentsh: Fix up user_fpu_struct typo for SH-5. (diff)
sh: Copy over special CFLAGS for SH-5 TLB miss.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/sh/mm/Makefile_64 b/arch/sh/mm/Makefile_64
index 5ff83583593e..2731cf1c4e0a 100644
--- a/arch/sh/mm/Makefile_64
+++ b/arch/sh/mm/Makefile_64
@@ -17,3 +17,28 @@ obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_NUMA) += numa.o
+# Special flags for fault_64.o. This puts restrictions on the number of
+# caller-save registers that the compiler can target when building this file.
+# This is required because the code is called from a context in entry.S where
+# very few registers have been saved in the exception handler (for speed
+# reasons).
+# The caller save registers that have been saved and which can be used are
+# r2,r3,r4,r5 : argument passing
+# r15, r18 : SP and LINK
+# tr0-4 : allow all caller-save TR's. The compiler seems to be able to make
+# use of them, so it's probably beneficial to performance to save them
+# and have them available for it.
+# The resources not listed below are callee save, i.e. the compiler is free to
+# use any of them and will spill them to the stack itself.
+CFLAGS_fault_64.o += -ffixed-r7 \
+ -ffixed-r8 -ffixed-r9 -ffixed-r10 -ffixed-r11 -ffixed-r12 \
+ -ffixed-r13 -ffixed-r14 -ffixed-r16 -ffixed-r17 -ffixed-r19 \
+ -ffixed-r20 -ffixed-r21 -ffixed-r22 -ffixed-r23 \
+ -ffixed-r24 -ffixed-r25 -ffixed-r26 -ffixed-r27 \
+ -ffixed-r36 -ffixed-r37 -ffixed-r38 -ffixed-r39 -ffixed-r40 \
+ -ffixed-r41 -ffixed-r42 -ffixed-r43 \
+ -ffixed-r60 -ffixed-r61 -ffixed-r62 \
+ -fomit-frame-pointer