1 files changed, 6 insertions, 2 deletions

diff --git a/arch/arm/lib/backtrace.S b/arch/arm/lib/backtrace.S
index b0951d0e8b2..aaf7220d9e3 100644
--- a/arch/arm/lib/backtrace.S
+++ b/arch/arm/lib/backtrace.S
@@ -38,7 +38,9 @@ ENDPROC(c_backtrace)
                 beq     no_frame                @ we have no stack frames
 
                 tst     r1, #0x10               @ 26 or 32-bit mode?
-                moveq   mask, #0xfc000003       @ mask for 26-bit
+ ARM(           moveq   mask, #0xfc000003       )
+ THUMB(         moveq   mask, #0xfc000000       )
+ THUMB(         orreq   mask, #0x03             )
                 movne   mask, #0                @ mask for 32-bit
 
 1:              stmfd   sp!, {pc}               @ calculate offset of PC stored
@@ -126,7 +128,9 @@ ENDPROC(c_backtrace)
                 mov     reg, #10
                 mov     r7, #0
 1:              mov     r3, #1
-                tst     instr, r3, lsl reg
+ ARM(           tst     instr, r3, lsl reg      )
+ THUMB(         lsl     r3, reg                 )
+ THUMB(         tst     instr, r3               )
                 beq     2f
                 add     r7, r7, #1
                 teq     r7, #6