Certain systems such as BREW take advantage of this to avoid the need for an MMU. A beneficial feature of the ARM architecture is that instructions can be made to execute conditionally. It’s important to use bx (branch + … ARM branch instructions This section contains the following subsections: B and BL Branch, and Branch with Link. The condition is tested against the current processor flags and if not met the instruction … This will cause a switch to Thumb state, because the LSB (least significant bit) is 1 and therefore not 4 byte aligned. B, BL, BX, BLX, and BXJ Branch, Branch with Link, Branch and exchange instruction set, Branch with Link and exchange instruction set, Branch and change to Jazelle state. 4.8. Branches are PC-relative. ARM Instruction Reference This chapter describes the ARM instructions that … This is common in other architectures’ branch or jump instructions but ARM allows its use with most mnemonics.

Since ARM’s branch instructions are PC-relative the code produced is position independent — it can execute from any address in memory. Upon encountering a B instruction, the ARM processor will jump immediately to the address given, and resume execution from there. BX Branch and exchange instruction set.

+/-32M range (24 bits × 4 bytes). The first instruction adds the address specified in PC plus 1 to R3 and then branches to the address in R3. Branching instructions refer to the act of switching execution to a different instruction sequence as a result of executing a branch instruction. Branching instructions in 8085 microprocessor. The condition is specified with a two-letter suffix, such as EQ or CC, appended to the mnemonic. B is the simplest branch. BL Branch with link. BLX Branch with link, and exchange BXJ Branch and change instruction set to Java. Chapter 4. Syntax op1{cond}{.W} label op2{cond} Rm where:op1 is one of:B Branch. Note that the actual value stored in the branch instruction is an offset from the current value of R15; rather than an absolute address.
This example code starts in ARM state. The three types of branching instructions are: Jump (unconditional and conditional) BLX Branch with Link and exchange instruction set.

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