[fasmg] Renesas RX v3 ISA

The following file 'rx.inc' contains calminstructions to assemble the RX v3 instruction set.
The optional double precision floating point coprocessor instructions are included.

This assembler was for personal use but I thought I should share it.

The syntax is not the same as in the official ISA. I have altered it to be similar to the usual fasm x86 syntax.
Mostly chaging from src,dst --> dst,src
e.g.

Code:

Official: mov.B    R2, 123[R1]
Altered : mov      byte [R1+123], R2

Official: mov      [R1+], R2
Altered : mov      R2, [R1]+

Official: mov      R1, [R3,R2]         ;index,base 
Altered : mov      [R2+R3], R1      ;base+index

Official: dpopm.D  DR1-DR5
Altered : dpopm    DR1, DR5

Official: bfmov    #5, #10, #3, R1, R2
Altered : bfmov    R2, R1, 3, 10, 5

Official: add      R1, R2, R3         ;src,src2,dst
Altered : add      R3, R1, R2        ;dst,src,src2

The syntax is different due to personal preference and ease of implementation.
The macros themselves owe a great deal to the lovely 'x86-2.inc' from fasm2, of which I have pilfered the main operand parsing.

This was the first experience I've had with macros so expect a good amount of kludge.
The assembler has been lightly tested for accuracy against the GNU rx-elf-as assembler. Do not assume it is 100% correct.

The reference document for the ISA is "RX Family RXv3 Instruction Set Architecture User’s Manual: Software".
Do note that the document has several errors which have been corrected in this assembler via crossreference with rx-elf-as.
e.g. STNZ and STZ encoding, note.1 pg 237 vs pg 368.

-Reed-