Instructions

• m68k16 - Motorola M68000 (16-bit bus)
• ALU - ALU
• alphabetically

m68k16 ALU - ALU

• exg-addr - exchange address registers
• exg-data - exchange data registers
• exg-data-addr - exchange data and address register
• illegal - illegal instruction
• moveq - move quick
• nop - no operation
• reset - reset external devices
• rte - return from exception
• rtr - return and restore condition codes
• rts - return from subroutine
• trap - trap
• trapv - trap on overflow
• unlk - unlink

m68k16 m68k16 - Motorola M68000 (16-bit bus)

• exg-addr - exchange address registers
• exg-data - exchange data registers
• exg-data-addr - exchange data and address register
• illegal - illegal instruction
• moveq - move quick
• nop - no operation
• reset - reset external devices
• rte - return from exception
• rtr - return and restore condition codes
• rts - return from subroutine
• trap - trap
• trapv - trap on overflow
• unlk - unlink

Individual instructions descriptions

exg-addr - exchange address registers

• machines: base


• syntax: FIXME


• format:

  15 14 13 12	11 10 9	8	7 6 5 4 3	2 1 0
  f-15-4	f-rx	f-8-1	f-opmode	f-ry
  0xc	rx	0x1	0x9	ry



• semantics:

  (sequence
    ((SI temp))
    (set temp (reg SI h-ar rx))
    (set (reg SI h-ar rx) (reg SI h-ar ry))
    (set (reg SI h-ar ry) temp))
  

exg-data - exchange data registers

• machines: base


• syntax: FIXME


• format:

  15 14 13 12	11 10 9	8	7 6 5 4 3	2 1 0
  f-15-4	f-rx	f-8-1	f-opmode	f-ry
  0xc	rx	0x1	0x8	ry



• semantics:

  (sequence
    ((SI temp))
    (set temp (reg SI h-dr rx))
    (set (reg SI h-dr rx) (reg SI h-dr ry))
    (set (reg SI h-dr ry) temp))
  

exg-data-addr - exchange data and address register

• machines: base


• syntax: FIXME


• format:

  15 14 13 12	11 10 9	8	7 6 5 4 3	2 1 0
  f-15-4	f-rx	f-8-1	f-opmode	f-ry
  0xc	rx	0x1	0x11	ry



• semantics:

  (sequence
    ((SI temp))
    (set temp (reg SI h-dr rx))
    (set (reg SI h-dr rx) (reg SI h-ar ry))
    (set (reg SI h-ar ry) temp))
  

illegal - illegal instruction

• machines: base


• syntax: FIXME


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

  f-15-16

  0x4afc



• semantics:

  (nop)
  

moveq - move quick

• machines: base


• syntax: FIXME


• format:

  15 14 13 12	11 10 9	8	7 6 5 4 3 2 1 0
  f-15-4	f-rx	f-8-1	f-imm8
  0x7	reg-@2	0x0	imm8



• semantics:

  (sequence
    ()
    (set (reg SI h-dr reg-@2) (ext SI imm8)))
  

nop - no operation

• machines: base


• syntax: nop


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

  f-15-16

  0x4e71



• semantics:

  (nop)
  

reset - reset external devices

• machines: base


• syntax: FIXME


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

  f-15-16

  0x4e70



• semantics:

  (nop)
  

rte - return from exception

• machines: base


• syntax: FIXME


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

  f-15-16

  0x4e73



• semantics:

  (nop)
  

rtr - return and restore condition codes

• machines: base


• syntax: FIXME


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

  f-15-16

  0x4e77



• semantics:

  (nop)
  

rts - return from subroutine

• machines: base


• syntax: RTS


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

  f-15-16

  0x4e75



• semantics:

  (nop)
  

trap - trap

• machines: base


• syntax: FIXME


• format:

  15 14 13 12 11 10 9 8 7 6 5 4	3 2 1 0
  f-15-12	f-vector
  0x4e4	vector



• semantics:

  (nop)
  

trapv - trap on overflow

• machines: base


• syntax: FIXME


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

  f-15-16

  0x4e76



• semantics:

  (nop)
  

unlk - unlink

• machines: base


• syntax: FIXME


• format:

  15 14 13 12 11 10 9 8 7 6 5 4 3	2 1 0
  f-15-13	f-rx
  0x9cb	reg-@2



• semantics:

  (nop)
  

Macro Instructions

• m68k16 - Motorola M68000 (16-bit bus)

m68k16 - Motorola M68000 (16-bit bus)

Individual macro-instructions descriptions

This documentation was machine generated from the cgen cpu description files for this architecture.
https://sourceware.org/cgen/