ucpuemu emulates a microcoded CPU architecture I developed for FPGA.
The assembler supports 29 instructions including call/ret, push/pop, arithmetic, and jumps, as well as named variables.
Build a program ROM using the assembler, uasm:
uasm/build/uasm prog.asm prog.rom
Run the CPU emulator:
ucpu/build/ucpu
Result: 0xA in R0
Example prog.asm:
ldi a 7 ; literals can be 0x7, 0b111, or 7
push a ; save the contents of register A
call fun
pop a ; restore the contents of register A
ld b myvar ; read B from memory at myvar
add a b ; add B into A
halt ; result: A = 10, B = 3
fun:
ldi a 3 ; interfere with register A to demonstrate push/pop after returning
store myvar a ; write A into memory at myvar
ret
myvar:
word 0xDEADBEEF ; allocate 32 bits at a named location