--- /dev/null
+.arch armv7-r
+.syntax unified
+.text
+.thumb
+ .global foo
+foo:
+@ Section A6.1.3 "Use of 0b1101 as a register specifier".
+
+@ R13 as the source or destination register of a mov instruction.
+@ only register to register transfers without shifts are supported,
+@ with no flag setting
+
+mov sp,r0
+mov r0,sp
+
+@ Using the following instructions to adjust r13 up or down by a
+@ multiple of 4:
+
+add sp,sp,#0
+addw sp,sp,#0
+sub sp,sp,#0
+subw sp,sp,#0
+add sp,sp,r0
+add sp,sp,r0,lsl #1
+sub sp,sp,r0
+sub sp,sp,r0,lsl #1
+
+@ R13 as a base register <Rn> of any load/store instruction.
+
+ldr r0, [sp]
+ldr r0, [pc]
+ldr pc, [r0]
+ldr sp, [r0]
+ldr pc, [pc]
+ldr sp, [sp]
+ldr pc, [sp]
+ldr sp, [pc]
+ldr sp, [r0, +pc]
+
+str r0, [sp]
+str r0, [pc]
+str pc, [r0]
+str sp, [r0]
+str pc, [pc]
+str sp, [sp]
+str pc, [sp]
+str sp, [pc]
+str sp, [r0, +pc]
+
+@ R13 as the first operand <Rn> in any add{s}, cmn, cmp, or sub{s} instruction.
+
+add r0, sp, r0
+adds r0, sp, r0
+add r0, sp, r0, lsl #1
+adds r0, sp, r0, lsl #1
+
+cmn sp, #0
+cmn sp, r0
+cmn sp, r0, lsl #1
+cmp sp, #0
+cmp sp, r0
+cmp sp, r0, lsl #1
+
+sub sp, #0
+subs sp, #0
+sub r0, sp, #0
+subs r0, sp, #0
+
+@ ADD (sp plus immediate).
+
+add sp, #4
+add r0, sp, #4
+adds sp, #4
+adds r0, sp, #4
+addw r0, sp, #4
+
+add sp, sp, #4
+adds sp, sp, #4
+addw sp, sp, #4
+
+@ ADD (sp plus register).
+
+add sp, r0
+add r0, sp, r0
+add r0, sp, r0, lsl #1
+adds sp, r0
+adds r0, sp, r0
+adds r0, sp, r0, lsl #1
+
+add sp, sp, r0
+add sp, sp, r0, lsl #1
+adds sp, sp, r0
+adds sp, sp, r0, lsl #1
+
+add sp, sp, sp
+
+@ SUB (sp minus immediate).
+
+sub r0, sp , #0
+subs r0, sp , #0
+subw r0, sp , #0
+
+sub sp, sp , #0
+subs sp, sp , #0
+subw sp, sp , #0
+
+@ SUB (sp minus register).
+
+sub sp, #0
+subs sp, #0
+sub r0, sp, r0, lsl #1
+subs r0, sp, r0, lsl #1
+
+sub sp, sp, r0, lsl #1
+subs sp, sp, r0, lsl #1
+
+@ PC-related insns (equivalent to adr).
+
+add r0, pc, #4
+sub r0, pc, #4
+adds r0, pc, #4
+subs r0, pc, #4
+addw r0, pc, #4
+subw r0, pc, #4
+
+@ nops to pad the section out to an alignment boundary.
+
+nop
+nop
+nop