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<HTML> <HEAD> <TITLE>Assembler Short Reference</TITLE> </HEAD> <BODY> <H2> ECO32 Instruction Set Architecture </H2> <TABLE BORDER=1> <TR><TH> Format </TH><TH> Description </TH></TR> <TR><TD> N </TD><TD> no operands </TD></TR> <TR><TD> RH </TD><TD> one register and the lower 16 bits of a word </TD></TR> <TR><TD> RHH </TD><TD> one register and the upper 16 bits of a word </TD></TR> <TR><TD> RRH </TD><TD> two registers and a zero-extended halfword </TD></TR> <TR><TD> RRS </TD><TD> two registers and a sign-extended halfword </TD></TR> <TR><TD> RRR </TD><TD> three registers </TD></TR> <TR><TD> RRX </TD><TD> three registers, or two registers and a zero-extended halfword </TD></TR> <TR><TD> RRY </TD><TD> three registers, or two registers and a sign-extended halfword </TD></TR> <TR><TD> RRB </TD><TD> two registers and a sign-extended 16 bit offset </TD></TR> <TR><TD> J </TD><TD> no registers and a sign-extended 26 bit offset </TD></TR> <TR><TD> JR </TD><TD> one register </TD></TR> </TABLE> <BR> <TABLE BORDER=1> <TR><TH> Mnemonic </TH><TH> Operands </TH><TH> Description </TH><TH> Format </TH></TR> <TR><TD> add </TD><TD> dst, op1, op2 </TD><TD> dst := op1 + op2 </TD><TD> RRY </TD></TR> <TR><TD> sub </TD><TD> dst, op1, op2 </TD><TD> dst := op1 - op2 </TD><TD> RRY </TD></TR> <TR><TD> mul </TD><TD> dst, op1, op2 </TD><TD> dst := op1 * op2, signed </TD><TD> RRY </TD></TR> <TR><TD> mulu </TD><TD> dst, op1, op2 </TD><TD> dst := op1 * op2, unsigned </TD><TD> RRX </TD></TR> <TR><TD> div </TD><TD> dst, op1, op2 </TD><TD> dst := op1 / op2, signed </TD><TD> RRY </TD></TR> <TR><TD> divu </TD><TD> dst, op1, op2 </TD><TD> dst := op1 / op2, unsigned </TD><TD> RRX </TD></TR> <TR><TD> rem </TD><TD> dst, op1, op2 </TD><TD> dst := remainder of op1/op2, signed </TD><TD> RRY </TD></TR> <TR><TD> remu </TD><TD> dst, op1, op2 </TD><TD> dst := remainder of op1/op2, unsigned </TD><TD> RRX </TD></TR> <TR><TD> and </TD><TD> dst, op1, op2 </TD><TD> dst := bitwise AND of op1 and op2 </TD><TD> RRX </TD></TR> <TR><TD> or </TD><TD> dst, op1, op2 </TD><TD> dst := bitwise OR of op1 and op2 </TD><TD> RRX </TD></TR> <TR><TD> xor </TD><TD> dst, op1, op2 </TD><TD> dst := bitwise XOR of op1 and op2 </TD><TD> RRX </TD></TR> <TR><TD> xnor </TD><TD> dst, op1, op2 </TD><TD> dst := bitwise XNOR of op1 and op2 </TD><TD> RRX </TD></TR> <TR><TD> sll </TD><TD> dst, op1, op2 </TD><TD> dst := shift op1 logically left by op2 </TD><TD> RRX </TD></TR> <TR><TD> slr </TD><TD> dst, op1, op2 </TD><TD> dst := shift op1 logically right by op2 </TD><TD> RRX </TD></TR> <TR><TD> sar </TD><TD> dst, op1, op2 </TD><TD> dst := shift op1 arithmetically right by op2 </TD><TD> RRX </TD></TR> <TR><TD> ldhi </TD><TD> dst, op1 </TD><TD> dst := op1 shifted left by 16 bits </TD><TD> RHH </TD></TR> <TR><TD> beq </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 == op2 </TD><TD> RRB </TD></TR> <TR><TD> bne </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 != op2 </TD><TD> RRB </TD></TR> <TR><TD> ble </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 <= op2 (signed) </TD><TD> RRB </TD></TR> <TR><TD> bleu </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 <= op2 (unsigned) </TD><TD> RRB </TD></TR> <TR><TD> blt </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 < op2 (signed) </TD><TD> RRB </TD></TR> <TR><TD> bltu </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 < op2 (unsigned) </TD><TD> RRB </TD></TR> <TR><TD> bge </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 >= op2 (signed) </TD><TD> RRB </TD></TR> <TR><TD> bgeu </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 >= op2 (unsigned) </TD><TD> RRB </TD></TR> <TR><TD> bgt </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 > op2 (signed) </TD><TD> RRB </TD></TR> <TR><TD> bgtu </TD><TD> op1, op2, offset </TD><TD> branch to PC+4+offset*4 if op1 > op2 (unsigned) </TD><TD> RRB </TD></TR> <TR><TD> j </TD><TD> offset </TD><TD> jump to PC+4+offset*4 </TD><TD> J </TD></TR> <TR><TD> jr </TD><TD> register </TD><TD> jump to register </TD><TD> JR </TD></TR> <TR><TD> jal </TD><TD> offset </TD><TD> jump to PC+4+offset*4, store PC+4 in $31 </TD><TD> J </TD></TR> <TR><TD> jalr </TD><TD> register </TD><TD> jump to register, store PC+4 in $31 </TD><TD> JR </TD></TR> <TR><TD> trap </TD><TD> -/- </TD><TD> cause a trap, store PC in $30 </TD><TD> N </TD></TR> <TR><TD> rfx </TD><TD> -/- </TD><TD> return from exception, restore PC from $30 </TD><TD> N </TD></TR> <TR><TD> ldw </TD><TD> dst, reg, offset </TD><TD> dst := word @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> ldh </TD><TD> dst, reg, offset </TD><TD> dst := sign-extended halfword @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> ldhu </TD><TD> dst, reg, offset </TD><TD> dst := zero-extended halfword @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> ldb </TD><TD> dst, reg, offset </TD><TD> dst := sign-extended byte @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> ldbu </TD><TD> dst, reg, offset </TD><TD> dst := zero-extended byte @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> stw </TD><TD> src, reg, offset </TD><TD> store src word @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> sth </TD><TD> src, reg, offset </TD><TD> store src halfword @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> stb </TD><TD> src, reg, offset </TD><TD> store src byte @ (reg+offset) </TD><TD> RRS </TD></TR> <TR><TD> mvfs </TD><TD> dst, special </TD><TD> dst := contents of special register </TD><TD> RH </TD></TR> <TR><TD> mvts </TD><TD> src, special </TD><TD> contents of special register := src </TD><TD> RH </TD></TR> <TR><TD> tbs </TD><TD> -/- </TD><TD> TLB search </TD><TD> N </TD></TR> <TR><TD> tbwr </TD><TD> -/- </TD><TD> TLB write random </TD><TD> N </TD></TR> <TR><TD> tbri </TD><TD> -/- </TD><TD> TLB read index </TD><TD> N </TD></TR> <TR><TD> tbwi </TD><TD> -/- </TD><TD> TLB write index </TD><TD> N </TD></TR> </TABLE> <BR> <TABLE BORDER=1> <TR><TH COLSPAN=8> Integer Registers </TH></TR> <TR> <TD> $0 </TD> <TD> always zero </TD> <TD> $8 </TD> <TD> temporary register (caller-save) </TD> <TD> $16 </TD> <TD> register variable (callee-save) </TD> <TD> $24 </TD> <TD> temporary register (caller-save) </TD> </TR> <TR> <TD> $1 </TD> <TD> reserved for assembler </TD> <TD> $9 </TD> <TD> temporary register (caller-save) </TD> <TD> $17 </TD> <TD> register variable (callee-save) </TD> <TD> $25 </TD> <TD> temporary register (caller-save) </TD> </TR> <TR> <TD> $2 </TD> <TD> func return value </TD> <TD> $10 </TD> <TD> temporary register (caller-save) </TD> <TD> $18 </TD> <TD> register variable (callee-save) </TD> <TD> $26 </TD> <TD> reserved for OS kernel </TD> </TR> <TR> <TD> $3 </TD> <TD> func return value </TD> <TD> $11 </TD> <TD> temporary register (caller-save) </TD> <TD> $19 </TD> <TD> register variable (callee-save) </TD> <TD> $27 </TD> <TD> reserved for OS kernel </TD> </TR> <TR> <TD> $4 </TD> <TD> proc/func argument </TD> <TD> $12 </TD> <TD> temporary register (caller-save) </TD> <TD> $20 </TD> <TD> register variable (callee-save) </TD> <TD> $28 </TD> <TD> reserved for OS kernel </TD> </TR> <TR> <TD> $5 </TD> <TD> proc/func argument </TD> <TD> $13 </TD> <TD> temporary register (caller-save) </TD> <TD> $21 </TD> <TD> register variable (callee-save) </TD> <TD> $29 </TD> <TD> stack pointer </TD> </TR> <TR> <TD> $6 </TD> <TD> proc/func argument </TD> <TD> $14 </TD> <TD> temporary register (caller-save) </TD> <TD> $22 </TD> <TD> register variable (callee-save) </TD> <TD> $30 </TD> <TD> interrupt return address </TD> </TR> <TR> <TD> $7 </TD> <TD> proc/func argument </TD> <TD> $15 </TD> <TD> temporary register (caller-save) </TD> <TD> $23 </TD> <TD> register variable (callee-save) </TD> <TD> $31 </TD> <TD> proc/func return address </TD> </TR> </TABLE> <BR> <TABLE BORDER=1> <TR><TH COLSPAN=8> Special Registers </TH></TR> <TR> <TD>0</TD><TD> Processor Status </TD> </TR> <TR> <TD>1</TD><TD> TLB Index </TD> <TD>2</TD><TD> TLB Entry High </TD> <TD>3</TD><TD> TLB Entry Low </TD> <TD>4</TD><TD> TLB Bad Address </TD> </TR> </TABLE> <BR> <TABLE BORDER=1> <TR> <TH COLSPAN=9> Processor Status Register </TH> </TR><TR> <TD> 31 .. 27 </TD> <TD> 26 </TD><TD> 25 </TD><TD> 24 </TD> <TD> 23 </TD><TD> 22 </TD><TD> 21 </TD> <TD> 20 .. 16 </TD> <TD> 15 .. 0 </TD> </TR><TR> <TD></TD> <TD COLSPAN=3> User Mode </TD> <TD COLSPAN=3> Interrupt Enable </TD> <TD> Priority </TD> <TD> Interupt Mask </TD> </TR><TR> <TD></TD> <TD> Cur </TD><TD> Prv </TD><TD> Old </TD> <TD> Cur </TD><TD> Prv </TD><TD> Old </TD> <TD> 0 .. 31 </TD> <TD></TD> </TR> </TABLE> </BODY> </HTML>