Arm

The ARM Application Binary Interface (ABI) and Embedded ABI (EABI) define standards for how executable code interacts with the ARM processor architecture and underlying system software. The ABI and EABI enable compatibility between various software components in an ARM system by standardizing areas like function calling conventions, register usage, stack layout, exception handling, and OS…

EABI stands for Embedded Application Binary Interface. It is a specification that defines how executables, libraries, and startup code interact with the ARM processor architecture. The EABI helps ensure compatibility and interoperability between different software components running on ARM-based devices. The ABI or Application Binary Interface is basically a set of rules that govern how…

A fault exception in the ARM Cortex-M3 is an unexpected event that occurs during program execution which transfers control to the fault handler. This allows the system to gracefully handle issues and continue normal operation. Fault exceptions are synchronous events generated by the processor in response to an instruction execution error. Overview of Exceptions in…

The ARM Cortex-M0 is an ultra low power 32-bit RISC processor core designed for microcontroller applications. It implements the ARMv6-M architecture and includes built-in exception handling for faults and interrupts. The Cortex-M0 handles exceptions through the use of the Nested Vectored Interrupt Controller (NVIC) and the processor’s exception model. ARMv6-M Exception Model The ARMv6-M architecture…

The ARM architecture defines a set of exceptions that can occur during program execution. These exceptions, also known as interrupts, allow the processor to handle events and transfer control to specific software routines to deal with these events. Some key things to know about exceptions in ARM architecture: Types of Exceptions There are several different…

The Cortex-M is a family of ARM processor cores designed specifically for microcontroller applications. One of the key features of Cortex-M cores is their support for exceptions and interrupts. An exception is an unexpected event that disrupts the normal flow of instruction execution in a processor. When an exception occurs, the processor immediately stops what…

Big endian and little endian are two different byte ordering methods used in computing. Specifically, big endian and little endian refer to the order in which bytes are stored in computer memory. The terms come from Jonathan Swift’s 1726 satirical novel Gulliver’s Travels, in which a war breaks out over whether soft boiled eggs should…

Little endian is a memory architecture where the least significant byte of a word is stored at the smallest memory address and the most significant byte at the largest memory address. In little endian architecture, data is stored in memory from the least significant byte to the most significant byte. Byte Ordering in Memory In…

The ARM Cortex-M33 is a little endian processor. This means that in memory, it stores the least significant byte of a multi-byte value in the lowest byte address and the most significant byte in the highest byte address. So for a 32-bit integer like 0x12345678, it would be stored in memory as 0x78563412. Understanding Endianness…

Endianness refers to the byte ordering and memory layout convention used by a processor architecture to store data in memory. It determines how sequence of bytes are interpreted as larger data types like words, double words etc. The ARM processor supports both big-endian and little-endian memory layouts. By default, ARM uses little-endian format. Big Endian…