add Assembler instructions

[Key-Real]

The PS1 has a coprocessor 2, it has extra instructions. The SDK tells me:

Code: C  [Select][+][-]

1. #define gte_ldv0( r0 ) __asm__ volatile (                       \
2.         "lwc2   $0, 0( %0 );"                                   \
3.         "lwc2   $1, 4( %0 )"                                    \
4.         :                                                       \
5.         : "r"( r0 ) )
6.  

a) I'm not shure how to translate this
     the first operand is a register, the second is the parameter r0


b)
 1)
I added

Code: Pascal  [Select][+][-]

1. A_LWC2

to ./compiler/mips/opcode.inc
and

Code: Pascal  [Select][+][-]

1. 'lwc2'

to ./compiler/mips/strinst.inc

now he recodnizes the Instruction, is it enough? Pls help me with a) because I don't knew how to do the operands the right way and when we will see if the instruction has the correct implementation