arm: lib: add __gnu_thumb1_case_si
The assembly for __gnu_thumb1_case_si was taken from upstream gcc and adapted
as width suffix was removed for the add instruction [1].
Signed-off-by: Francis Laniel <francis.laniel@amarulasolutions.com>
Tested-by: Tony Dinh <mibodhi@gmail.com>
[1] https://github.com/gcc-mirror/gcc/blob/4f181f9c7ee3efc509d185fdfda33be9018f1611/libgcc/config/arm/lib1funcs.S#L2156
Acked-by: Pali Rohár <pali@kernel.org>
Acked-by: Tony Dinh <mibodhi@gmail.com>
diff --git a/arch/arm/lib/lib1funcs.S b/arch/arm/lib/lib1funcs.S
index de15d09e..a1f44d9 100644
--- a/arch/arm/lib/lib1funcs.S
+++ b/arch/arm/lib/lib1funcs.S
@@ -419,4 +419,21 @@
ret lr
ENDPROC(__gnu_thumb1_case_uhi)
.popsection
+
+/* Taken and adapted from: https://github.com/gcc-mirror/gcc/blob/4f181f9c7ee3efc509d185fdfda33be9018f1611/libgcc/config/arm/lib1funcs.S#L2156 */
+.pushsection .text.__gnu_thumb1_case_si, "ax"
+ENTRY(__gnu_thumb1_case_si)
+ push {r0, r1}
+ mov r1, lr
+ adds r1, r1, #2 /* Align to word. */
+ lsrs r1, r1, #2
+ lsls r0, r0, #2
+ lsls r1, r1, #2
+ ldr r0, [r1, r0]
+ adds r0, r0, r1
+ mov lr, r0
+ pop {r0, r1}
+ mov pc, lr /* We know we were called from thumb code. */
+ENDPROC(__gnu_thumb1_case_si)
+.popsection
#endif