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9.32.2.2 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)