By David Seal
Produced via the architects which are actively engaged on the ARM specification, this booklet comprises certain information regarding all types of the ARM and ThumbTM guide units, the reminiscence administration and cache services, and optimized code examples. either an architectural review and programmer's version are awarded. assurance additionally comprises 26-bit architectures and the approach keep an eye on Coprocessor.
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Extra resources for ARM Architecture Reference Manual (2nd Edition)
More generally, there is no point in changing the configured endianness of an ARM processor to be different from that of the memory system it is attached to, because no additional architecturally defined operations become available as a result of doing so. So normally, the only time the configured endianness is changed is at reset to make it match the memory system endianness. ARM DDI 0100E Copyright © 1996-2000 ARM Limited. All rights reserved. 3 Unaligned memory accesses The ARM architecture normally expects all memory accesses to be suitably aligned.
These registers are 32 bits wide and are described in General-purpose registers on page A2-5. • 6 status registers. These registers are also 32 bits wide, but only 12 of the 32 bits are allocated or need to be implemented. These are described in Program status registers on page A2-9. Registers are arranged in partially overlapping banks, with a different register bank for each processor mode, as shown in Figure 2-1. At any time, 15 general-purpose registers (R0 to R14), one or two status registers and the program counter are visible.
These are described in Program status registers on page A2-9. Registers are arranged in partially overlapping banks, with a different register bank for each processor mode, as shown in Figure 2-1. At any time, 15 general-purpose registers (R0 to R14), one or two status registers and the program counter are visible. Each column of Figure 2-1 shows which general-purpose and status registers are visible in the indicated processor mode. Modes Privileged modes Exception modes User System Supervisor Abort Undefined R0 R0 R0 R0 R0 R0 R0 R1 R1 R1 R1 R1 R1 R1 R2 R2 R2 R2 R2 R2 R2 R3 R3 R3 R3 R3 R3 R3 R4 R4 R4 R4 R4 R4 R4 R5 R5 R5 R5 R5 R5 R5 R6 R6 R6 R6 R6 R6 R6 R7 R7 R7 R7 R7 R7 R7 R8 R8 R8 R8 R8 R8 R8_fiq R9 R9 R9 R9 R9 R9 R9_fiq R10 R10 R10 R10 R10 R10 R10_fiq R11 R11 R11 R11 R11 R11 R11_fiq R12 R12 R12 R12 R12 R12 R12_fiq R13 R13 R13_svc R13_abt R13_und R13_irq R13_fiq R14 R14 R14_svc R14_abt R14_und R14_irq R14_fiq PC PC CPSR CPSR PC PC CPSR CPSR SPSR_svc SPSR_abt PC CPSR SPSR_und Interrupt PC Fast interrupt PC CPSR CPSR SPSR_irq SPSR_fiq indicates that the normal register used by User or System mode has been replaced by an alternative register specific to the exception mode Figure 2-1 Register organization A2-4 Copyright © 1996-2000 ARM Limited.