9.43.2.2 Register Names

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:

pr

procedure register (holds return address)

pc

program counter

mach

macl

high and low multiply accumulator registers

sr

status register

gbr

global base register

vbr

vector base register (for interrupt vectors)