ARM: use BX when branch to an address in register

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26432 a1c6a512-1295-4272-9138-f99709370657

apps/codecs/lib/mdct_arm.S

@@ -60,7 +60,7 @@ mdct_butterfly_8:
     add     r11, r12, r7                @ y7 = (x7 + x3) + (x5 + x1)
     stmia   r0!, {r1, r2, r3, r4, r5, r6, r10, r11}
 
-    mov     pc, lr
+    bx      lr
 
 mdct_butterfly_16:
 @ inputs: r0,r1   &lr

firmware/target/arm/crt0-pp.S

@@ -163,7 +163,7 @@ remap_start:
     str    r2, [r1]
     str    r4, [r3]
     ldr    r1, L_post_remap
-    mov    pc, r1
+    bx     r1
 L_post_remap:
     .word remap_end
 remap_end:

firmware/target/arm/imx31/crt0.S

@@ -67,7 +67,7 @@ newstart:
     strhi   r4, [r1], #4
     bhi     1b
 
-    mov     pc, r6
+    bx      r6
 
     /* Remapping stub. No absolute addresses may be used until after the
      * remapping is complete. */

firmware/target/arm/s3c2440/crt0.S

@@ -486,7 +486,7 @@ skipreset:
     ldr     r1, =donecopy
     ldr     r2, =0x30000000
     add     r1, r1, r2
-    mov     pc, r1           /* The code is located where we want it so jump */
+    bx      r1               /* The code is located where we want it so jump */
 
 donecopy: