ARMv8AArch32保留了ARMv7定义的privilege,AArch64的privilege level由Exception level决定,因此ELn对应PLn。在AArch32状态,Trusted OS软件运行在Secure EL3,在AArch64状态,其运行在Secure EL1。 图3-3ARMv8AArch64和AArch32的Exception level 3.2改变Exc
文档介绍:Armv8-A 编程指南(Cortex_-A Series Programmer's Guide for ARMv8-A) 现在下载 VIP会员,AET专家下载不扣分;重复下载不扣分,本人上传资源不扣分。ARMv8 相关资源Armv8(64)指令集(ARMv8_ISA_Overview_PRD0 Armv8-A 编程指南(Cortex_-A Series Progr...
ARM Cortex-A Series Version: 1.0 Programmer’s Guide for ARMv8-A 简介 32-bit到64-bit的变化: A64指令集提供了一些显著的性能优势,包括一个更大的寄存器池。在函数调用必须传递大于四个寄存器时,额外的寄存器以及ARM Architecture Procedure Call Standard (AAPCS)便可提升性能。在ARMv7中,这将使用堆栈,而AAr...
Neon vector shifts are very similar to shifts in scalar Arm code. A shift moves the bits in each element of a vector left or right. Bits that fall off the left or right of each element are discarded. These discarded bits are not shifted to adjacent elements. The number of bits to shif...