Motorola M68CPU32BUG Manuel d'utilisateur Page 113

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ASSEMBLER/DISASSEMBLER
M68CPU32BUG/D 4-11
4.3.1 Executing the Assembler/Disassembler
The assembler/disassembler is actuated using the ;DI option of the MM (Memory Modify) and
MD (Memory Display) commands:
MM <ADDR >;DI
where
<CR> sequences to next instruction
.<CR> exits command
and
MD[S] <ADDR>[:<count>I<ADDR>];DI
Use the MM (;DI option) to enter and modify the program. When this command is used, the
memory contents at the specified location are disassembled and displayed. A new or modified
line can be entered if desired.
The disassembled line is either an M68300 Family instruction, a SYSCALL, or a DC.W
directive. If the disassembler recognizes a valid form of an instruction, the instruction is returned.
If the disassembler does not recognizes a valid form of an instruction, random data occurs, the
DC.W $XXXX (always hex) is returned. Because the disassembler gives precedence to
instructions, a word of data interpreted as a valid instruction is returned as the instruction.
4.3.2 Entering a Source Line
Enter a new source line immediately following the disassembled line. Use the format discussed
in paragraph 4.2.1.
CPU32Bug>MM 6000;DI <CR>
00006000 2600 MOVE.L D0,D3 ? ADDQ.L #1,A3 <CR>
When a line is terminated with a carriage return, the old source line is erased from the terminal
screen, the new line is assembled and displayed, and the next instruction in memory is
disassembled and displayed:
CPU32Bug>MM 6000;DI<CR>
00006000 528B ADDQ.L #1,A3
00006002 4282 CLR.L D2 ?
Another program line can now be entered. Program entry continues in like manner until all lines
have been entered. A period (.) is used to exit the MM command. If an error occurs during line
assembly, the assembler displays the line unassembled with an error message. The location being
accessed is redisplayed:
CPU32Bug>MM 6000;di <CR>
00006000 528B ADDQ.L #$1,A3? LEA.L 5(A0,D8),A4<CR>
LEA.L 5(A0,D8),A4
BAD COMBINATION OF COMMAND, OPERANDS
00006000 528B ADDQ.L #$1,A3?
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