opcode not supported on this processor

[mao ye]

I compile the rtems.But I meet a trouble:
in the cpu_asm.s
other code can be compilede,but there are some errors:
opcode not supported on this processor:mips1(mips1) 'dmfc0 $8,$14'
opcode not supported on this processor:mips1(mips1) 'dadd $5,$4,$0'
opcode not supported on this processor:mips1(mips1) 'dsll $9,$9,2'
opcode not supported on this processor:mips1(mips1) 'eret'

why?

Thanks.
                     ye mao
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