ARM Assembly

Line-by-Line Interpretation of Armv8-A Assembly SMP Boot Code

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Line-by-Line Interpretation of Armv8-A Assembly SMP Boot Code

This article provides a line-by-line explanation of the Armv8-A assembly code sourced from Arm® Development Studio. It focuses on the boot sequence of the AArch64 MPCore processor. This code initializes the system from Exception Level 3 (EL3, typically the Secure Monitor mode) and transitions to Exception Level 1 (EL1, typically the OS mode), during which … Read more

Control Transfer in ARM Assembly

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Control Transfer in ARM Assembly

1. Direct Transfer (Simple Jump) After executing the current instruction, the next instruction is not executed in sequence; instead, it jumps to execute other instructions. ① B Instruction <span>B LABEL</span> This transfers execution to the instruction at the label LABEL (PC) = LABEL Commonly used for branching, for example: B LABEL ; Unconditional jump to … Read more