[src/trunk]: src/sys/arch/arm/include Add KMODTRAMPOLINE(name)

[matt <matt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4de282a992d5
branches:  trunk
changeset: 789120:4de282a992d5
user:      matt <matt%NetBSD.org@localhost>
date:      Wed Aug 07 17:09:50 2013 +0000

description:
Add KMODTRAMPOLINE(name)
There are 3 variations:
one for armv7 using movw ip,#:lower16:func; movt ip,#:upper16:func; bx ip
one for armv4t+ using ldr ip, pc; bx ip; .word func
one for everything else using ldr pc, [pc, #-4]; .word func

diffstat:

 sys/arch/arm/include/asm.h |  21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)

diffs (33 lines):

diff -r 9ed36259b204 -r 4de282a992d5 sys/arch/arm/include/asm.h
--- a/sys/arch/arm/include/asm.h        Wed Aug 07 17:06:22 2013 +0000
+++ b/sys/arch/arm/include/asm.h        Wed Aug 07 17:09:50 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: asm.h,v 1.17 2013/01/28 23:47:38 matt Exp $    */
+/*     $NetBSD: asm.h,v 1.18 2013/08/07 17:09:50 matt Exp $    */
 
 /*
  * Copyright (c) 1990 The Regents of the University of California.
@@ -178,4 +178,23 @@
 # define RETc(c)       __CONCAT(mov,c) pc, lr
 #endif
 
+#ifdef _ARM_ARCH_7
+#define KMODTRAMPOLINE(n)                      \
+_ENTRY(__wrap_ ## n)                           \
+       movw    ip, #:lower16:n;        \
+       movt    ip, #:upper16:n;        \
+       bx      ip
+#elif defined(_ARM_ARCH_4T)
+#define KMODTRAMPOLINE(n)      \
+_ENTRY(__wrap_ ## n)           \
+       ldr     ip, [pc];       \
+       bx      ip;             \
+       .word   n
+#else
+#define KMODTRAMPOLINE(n)      \
+_ENTRY(__wrap_ ## n)           \
+       ldr     pc, [pc, #-4];  \
+       .word   n
+#endif
+
 #endif /* !_ARM_ASM_H_ */