ARM. Access user R13 and R14 from Supervisor mode

Question

How do I access the user R13 and R14 which are saved when supervisor mode is entered? I am using an ARM7TDMI.

I.E. I do not want to access supervisor R14 which now

Answer 1

I've discovered a better way: -

When doing a STM, if r15 isn't one of the operands then ^ gives access to user-mode registers. However, autoincrementing doesn't seem to work within the instruction, and a nop is required afterwards if you want to access the register bank.

Something like

stmfd r13, {r13-r14}^ ;store r13 and r14 usermode
nop
sub r13, r13, #8      ;update stack pointer