You can use the predefined symbols ‘r0’, ‘r1’, ‘r2’, ‘r3’, ‘r4’, ‘r5’, ‘r6’, ‘r7’, ‘r8’, ‘r9’, ‘r10’, ‘r11’, ‘r12’, ‘r13’, ‘r14’, and ‘r15’ to refer to the SH registers.
The SH also has these control registers:
prprocedure register (holds return address)
pcprogram counter
machmaclhigh and low multiply accumulator registers
srstatus register
gbrglobal base register
vbrvector base register (for interrupt vectors)