cpucache_invalidate: use bx reg instead of mov pc, reg to return

Using BX has the effect to set the T bit, so it can return to a thumb
function

With this change, rockbox runs fine on Clipv2 built with -mthumb (for
most files which don't use inline 32 bits ARM assembly)

Some other places use code which change the T bit on armv5 but not on
armv4 so armv4 won't run

See FS#6734

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26386 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/target/arm/mmu-arm.S b/firmware/target/arm/mmu-arm.S
index 2ffc834a0c..e8482a8d94 100644
--- a/firmware/target/arm/mmu-arm.S
+++ b/firmware/target/arm/mmu-arm.S
@@ -396,5 +396,5 @@ cpucache_invalidate:
     mov     r2, lr                  @ save lr to r1, call uses r0 only
     bl      invalidate_dcache       @ Clean and invalidate entire DCache
     mcr     p15, 0, r1, c7, c5, 0   @ Invalidate ICache (r1=0 from call)
-    mov     pc, r2                  @
+    bx      r2
     .size   invalidate_idcache, .-invalidate_idcache