Sandeep Mistry sandeepmistry

Foreward

This document was originally written several years ago. At the time I was working as an execution core verification engineer at Arm. The following points are coloured heavily by working in and around the execution cores of various processors. Apply a pinch of salt; points contain varying degrees of opinion.

It is still my opinion that RISC-V could be much better designed; though I will also say that if I was building a 32 or 64-bit CPU today I'd likely implement the architecture to benefit from the existing tooling.

Mostly based upon the RISC-V ISA spec v2.0. Some updates have been made for v2.2

Original Foreword: Some Opinion

The RISC-V ISA has pursued minimalism to a fault. There is a large emphasis on minimizing instruction count, normalizing encoding, etc. This pursuit of minimalism has resulted in false orthogonalities (such as reusing the same instruction for branches, calls and returns) and a requirement for superfluous instructions which impacts code density both in terms of size and

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

	#!/usr/bin/env python3

	import os
	import paramiko

	ssh_key_filename = os.getenv('HOME') + '/.ssh/id_rsa'

	jumpbox_public_addr = '168.128.52.199'
	jumpbox_private_addr = '10.0.5.10'
	target_addr = '10.0.5.20'

	#!/usr/bin/env bash

	set -Eeuo pipefail
	trap cleanup SIGINT SIGTERM ERR EXIT

	script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P)

	usage() {
	cat <<EOF
	Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...]

	# IDA (disassembler) and Hex-Rays (decompiler) plugin for Apple AMX
	#
	# WIP research. (This was edited to add more info after someone posted it to
	# Hacker News. Click "Revisions" to see full changes.)
	#
	# Copyright (c) 2020 dougallj


	# Based on Python port of VMX intrinsics plugin:
	# Copyright (c) 2019 w4kfu - Synacktiv