TODO

Currently implemented instructions:

    ADCS  Rd, Rm
    ADD   Rd, SP, #imm8
    ADD   Rd, PC, #imm8
    ADD   SP, SP, #imm7
    ADD   Rd, Rm
    ADDS  Rd, Rn, #imm3
    ADDS  Rd, #imm8
    ADDS  Rd, Rn, Rm
    ANDS  Rd, Rm
    ASRS  Rd, Rm, #imm5
    ASRS  Rd, Rm
    B     label
    B<c>  label
    BICS  Rd, Rm
    BKPT  #imm8
    BL    label
    BLX   Rm
    BX    Rm
    CMN   Rn, Rm
    CMP   Rn, #imm8
    CMP   Rn, Rm
    DMB   #option
    DSB   #option
    EORS  Rn, Rm
    ISB   #option
    LDMIA Rn!, {...}
    LDR   Rt, [PC, #imm8]
    LDR   Rt, [SP, #imm8]
    LDR   Rt, [Rn, #imm5]
    LDR   Rt, [Rn, Rm]
    LDRB  Rt, [Rn, #imm5]
    LDRB  Rt, [Rn, Rm]
    LDRH  Rt, [Rn, #imm5]
    LDRH  Rt, [Rn, Rm]
    LDRSB Rt, [Rn, Rm]
    LDRSH Rt, [Rn, Rm]
    LSLS  Rd, Rm, #imm5
    LSLS  Rd, Rm
    LSRS  Rd, Rm, #imm5
    LSRS  Rd, Rm
    MOV   Rd, Rm
    MOVS  Rd, #imm8
    MOVS  Rd, Rm
    MRS   Rd, spec_reg
    MULS  Rd, Rm
    MVNS  Rd, Rm
    NOP
    ORRS  Rd, Rm
    POP   {...}
    PUSH  {...}
    REV   Rd, Rm
    REV16 Rd, Rm
    REVSH Rd, Rm
    RORS  Rd, Rm
    RSBS  Rd, Rm, #0
    SEV
    SBCS  Rd, Rm
    STMIA Rn!, {...}
    STR   Rt, [SP, #imm8]
    STR   Rt, [Rn, #imm5]
    STR   Rt, [Rn, Rm]
    STRB  Rt, [Rn, #imm5]
    STRB  Rt, [Rn, Rm]
    STRH  Rt, [Rn, #imm5]
    STRH  Rt, [Rn, Rm]
    SUB   SP, SP, #imm7
    SUBS  Rd, Rn, #imm3
    SUBS  Rd, #imm8
    SUBS  Rd, Rn, Rm
    SXTB  Rd, Rm
    SXTH  Rd, Rm
    TST   Rn, Rm
    UDF   #imm8
    UXTB  Rd, Rm
    UXTH  Rd, Rm
    WFE
    WFI
    YIELD

Currently implemented escape hatches:

    0xb700 terminate emulation
    0xb701 dump registers
    0xb702 console output
    0xb703 console input
    0xb704 check input status

Other items to be done:

 - check if there is sufficient memory before loading the image.
 - provide more escape hatches and functionality to interact with the host
 - implement interrupt handlinig
 - implement basic ARM peripherals