castleberrysam

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports = [ ./hardware-configuration.nix ];

  # Use the systemd-boot EFI boot loader.

castleberrysam

	;; compiled with -O0
	ldr	r2, .L14+56
	ldr	r3, [r7, #52]
	ldr	r3, [r2, r3, lsl #2]
	lsrs	r3, r3, #2
	str	r3, [r7, #28]

	ldr	r0, [r7, #28]
	bl	__aeabi_ui2d

castleberrysam

ARM_FUNC_ALIAS aeabi_ui2d floatunsidf
        CFI_START_FUNCTION

        teq     r0, #0
        do_it   eq, t
        moveq   r1, #0
        RETc(eq)

        do_push {r4, r5, lr}        @ sp -= 12
        .cfi_adjust_cfa_offset 12   @ CFA is now sp + previousOffset + 12

castleberrysam

--[[
  Generates a diagram for bitfields in a register, data type, or data structure.
  The single arg is a comma separated list.
  A normal entry is two elements, the first is the field name and the second is the bit width.
  There are also directives, starting with !, to change the table formatting.

  !SEP:
  Inserts a visual break in the row, for grouping fields together into larger objects.

  !WIDTH <N>:

castleberrysam

rows and column numbers start at the bottom left

P0.2: USB pin D+
P0.3: USB pin D-
P0.4: USB pin D+ pulldown (used during reset)
P2.0: USB pin D- pullup (used during reset)

P0.5: switch row 6 drive
P0.6: switch row 5 drive
P0.7: switch row 4 drive

castleberrysam

#include <stdio.h>

extern char *fw_data;
extern int fw_len;

// used to hold the RunOnlyOneUpdateTools mutex
extern HANDLE dword_458908;

// used to hold the first byte pair after the firmware header
extern int dword_45868c;

castleberrysam

#!/usr/bin/env python3

import sys
from struct import *

def decrypt8(int0, int1, key):
    garbage = 0xc6ed3720
    for i in range(32):
        edi = (key[3] + (int0 >> 5)) & 0xffffffff
        ebx = (key[2] + (int0 << 4)) & 0xffffffff

castleberrysam

(mov %r4 0)               ; zero KEY input buffer count
(mov (@+ %r4 #xffe0) %r4)

(mov (@+ %r4 #x8014) %r4) ; zero end of CONTEXT

(mov %r5 (@+ %r4 |FORTH-PTR|)) ; initialize FORTH dictionary
(mov (@+ %r4 #x8018) %r5)

(mov %r5 (@+ %r4 |ROOT-PTR|)) ; initialize ROOT dictionary
(mov (@+ %r4 #x801a) %r5)

castleberrysam

uint16_t fibonacci(uint16_t n)
{
  uint16_t first = 1;
  uint16_t second = 1;
  
  while(n > 1) {
    uint16_t tmp = first + second;
    second = first;
    first = tmp;

castleberrysam

16 registers
R0-R15
R0: program counter
R1: stack pointer
R15: link register

PUSH R           0000rrrr
CALL R, C        1001rrrr cccccccc cccccccc
POP  R           0001rrrr