Jump Assembly Free UPDATED Download

I want to jump to specific section of my main procedure from another procedure. Basically I have an intro part of my main proc, and the rest of it I want to loop through, but from another procedure. Is this possible?

This is performed by a set of jump instructions j depending upon the condition. The conditional instructions transfer the control by breaking the sequential flow and they do it by changing the offset value in IP.

Jump Assembly Free Download

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The CMP instruction compares two operands. It is generally used in conditional execution. This instruction basically subtracts one operand from the other for comparing whether the operands are equal or not. It does not disturb the destination or source operands. It is used along with the conditional jump instruction for decision making.

If some specified condition is satisfied in conditional jump, the control flow is transferred to a target instruction. There are numerous conditional jump instructions depending upon the condition and data.

A SHORT jump is a jump to a particular offset from the current instruction pointer address. A NEAR jump can use a larger offset value, and so can jump further away from the current instruction pointer address. Both of these jump types are usually relative - that is, the operand is an offset from the current instruction pointer (though in assembly source, you normally provide the target label - the assembler or linker then computes the offset). Neither of them jump to a different code segment.

A FAR jump specifies both a segment and offset, which are both absolute in the sense that they specify the required code segment and instruction pointer, rather than an offset relative to the current code segment / instruction pointer.

To summarise, there are three types of direct jump: short and near, which are both jumps capable of jumping different relative distances with the same code segment, and far (or long), which can jump to any absolute address (segment and offset).

(Note that it is also possible to perform an indirect absolute jump, where you specify an operand that holds the absolute address that you wish to jump to. In this case the jump can either be near or far - i.e. it can include or not include the required code segment).

If you don't specify the jump 'distance', it is up to the assembler whether you get a short, near or far jump. Most modern assemblers are "two-pass" and will use a short jump if possible, or a near or far jump otherwise - the latter only if required.

Direct (except in 64-bit mode) or memory-indirect, but always absolute. Interestingly, x86's only absolute direct jump.

No conditional far jumps, only jmp or call / retf

Syntax details depend on the assembler, but often something like jmp 0x10:foo or jmp far [eax] work in NASM, the latter loading 6 bytes from [DS:EAX] into CS:EIP if run in 32-bit mode.

In 16 and 32-bit mode, jmp rel16/rel32 can reach any other IP/EIP value, but in 64-bit mode the +-2GiB range is only a small fraction of the virtual address space. Still, it's normal for code for a single executable to assume that it fits in 2GiB so any code can reach any other code in the same library or main executable with a relative near jump/call. A "large" code model would require mov reg, imm64 / jmp reg or something inefficient like that. Or even worse to make it position-independent.

LONG is unusual terminology. In most assemblers, the encoding overrides are short (rel8) or near (rel16 or rel32 depending on mode) to force the length (and thus how far you can jump) for near jumps (cs unchanged, just adding an offset to IP/EIP/RIP)

Historically, some assemblers are not as smart as NASM, and always needed manual hinting if you wanted the short encoding for jumps. Especially for forward jumps, to a label the assembler hasn't seen yet. (If you're working with 16-bit code using old tools from that era, you may run into this.) Even NASM used to default to optimization disabled in old versions, which would make it choose the long encoding.

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If you have a question you can start a new discussionHow to create jump-tables in Armv8 Arm32 assembly language?AnthonyPaulOover 6 years agoI've been learning Arm32 assembly on my Raspberry Pi recently and all is going well but I would like to create a jump table and have no idea how. The bl (branch and link) instruction needs an address label, but I would like to simulate a switch statement by creating a jump table of addresses that can be jumped to but I don't know how to do this. As I'm emulating an 8-bit computer with 256 possible opcodes I need to be able to define 256 opcode handlers and set up a jump table containing the address of these handlers so I can bl to them based on the opcode as an index. How may I accomplish this task? 2351a5e196