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9.33.2.2 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)