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cmp 68k
ibm 360 assembly language instruction set
mainframe assembler instructions list
z os assembler language reference
68k assembly
z/architecture principles of operation
ibm 370 instruction set
68k opcodes
8 Apr 2013 The instruction set is usually in there with examples. BRA is a relative jump, e.g. "jump forward 20 instructions" or "jump back 80 instructions". All three are written the same way in assembler, it's the assembler program's job to translate "bra some_label" into the actual relative jump once everything is
BRA. Operation: If (condition true) then PC + d -->; PC. Compatibility: 68000 Family. Assembler Syntax: BRA <label>. Attributes: Size = (Byte, Word, Long*) *(MC68020, MC68030, MC68040 only). Description: Program execution continues at location (PC) + displacement. The PC contains the address of the instruction
IBM reserves the right to change those plans at its discretion. Any reliance on such a disclosure is solely at your own risk. IBM makes no commitment to provide additional information in the future. Orlando, Florida. April 2002. New and Not-So-New. Assembler Instructions. Instructions Your Mother Never Told. You About.
Assembler directives g Assembler directives n are instructions to the assembler program g and they appear in the mnemonic (opcode) field of the source code .. BRA. BRA (branch always) implements an unconditional branch, relative to the PC. The offset is expressed as an 8- or 16-bit signed integer. If the destination is
The BRAS is nothing but BRANH RELATIVE AND SAVE. Relative Branch Addressing : An operand address that refers to storage is derived from an intermediate value, which either is contained in a register designated by an R field in the instruction or is calculated from the sum of three binary numbers:
28 Feb 2011 The use of (based) branch instructions requires that nearly every line of subroutine). • For historical reasons, many experienced assembler . BRAS R1,I2. [RI]. • RI and RSI format. • Offset from current instruction address is signed number of halfwords, represented by the immediate value. • Maximum valid
Introduction. BRA – BRanch Always. The destination operand is added to the PC, the 68k will continue reading at the new offset held in PC. Examples. This is similar to JMP with a few minor differences. Below is the same list of instructions that the JMP had, except this time the JMP instruction has been replaced with a BRA
"HERE BRA Jump" and the explain is. Befor Instruction PC = address(HERE), After Instruction PC = address(Jump)". it seems that the "Jump" is absolut address, not a actual number to point out a relative address. I just want to know, if the "n" in the instruction is calculated by the Assembler or should I do it by
Attempts to create an instruction at an odd address will be flagged as an error by the assembler; an attempt to branch to an odd address will result in an address exception. There are four classes of instructions. 360 instructions are those which were part of the original IBM 360 mainframe instruction set, they are shown on
10 Aug 2011 MEnd. • The generated instruction is. MVC Target(L'&Source),&Source. Just what you wanted! - - -. MVC2 Buffer,=C'A long message' MVC2 handles everything. ? It automatically uses the length attribute of the second operand. SHARE 117, Session 9281. Upgrading Assembler Programs
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