using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Text; namespace Indy.IL2CPU.Assembler.X86 { public class Assembler : Indy.IL2CPU.Assembler.Assembler { public const string BreakMethodName = "DebugStub_Break"; protected byte mComNumber = 0; protected UInt16[] mComPortAddresses = { 0x3F8, 0x2F8, 0x3E8, 0x2E8 }; public Assembler(Func aGetStreamForGroup, bool aInMetalMode, byte aComNumber) : base(aGetStreamForGroup, aInMetalMode) { mComNumber = aComNumber; } public Assembler(Func aGetStreamForGroup) : base(aGetStreamForGroup) { } private static string GetValidGroupName(string aGroup) { return aGroup.Replace('-','_').Replace('.', '_'); } protected override void EmitCodeSectionHeader(string aGroup, TextWriter aOutputWriter) { base.EmitCodeSectionHeader(aGroup, aOutputWriter); using (var xAsm = new RawAssembler()) { aOutputWriter.WriteLine("section .text"); if (aGroup == MainGroup) { aOutputWriter.WriteLine("global Kernel_Start"); aOutputWriter.WriteLine("Kernel_Start: "); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine("; MultiBoot-compliant loader (e.g. GRUB or X.exe) provides info in registers: "); aOutputWriter.WriteLine("; EBX=multiboot_info "); aOutputWriter.WriteLine("; EAX=0x2BADB002 - check if it's really Multiboot loader "); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine(" ;- copy mb info - some stuff for you "); //aOutputWriter.WriteLine(" mov mb_info, ebx"); aOutputWriter.WriteLine(" add ebx, 4"); aOutputWriter.WriteLine(" mov dword eax, [ebx]"); aOutputWriter.WriteLine(" mov dword [MultiBootInfo_Memory_Low], eax"); aOutputWriter.WriteLine(" add ebx, 4"); aOutputWriter.WriteLine(" mov dword eax, [ebx]"); aOutputWriter.WriteLine(" mov dword [MultiBootInfo_Memory_High], eax"); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine(" mov esp,Kernel_Stack "); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine("; some more startups todo"); aOutputWriter.WriteLine(" cli"); //aOutputWriter.WriteLine(" push ebx"); if (mComNumber > 0) { UInt16 xComAddr = mComPortAddresses[mComNumber - 1]; aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 1).ToString("X")); aOutputWriter.WriteLine("mov al, 0x00"); aOutputWriter.WriteLine("out DX, AL"); // disable all interrupts aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 3).ToString("X")); aOutputWriter.WriteLine("mov al, 0x80"); aOutputWriter.WriteLine("out DX, AL"); // Enable DLAB (set baud rate divisor) aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 0).ToString("X")); aOutputWriter.WriteLine("mov al, 0x01"); aOutputWriter.WriteLine("out DX, AL"); // Set divisor (lo byte) aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 1).ToString("X")); aOutputWriter.WriteLine("mov al, 0x00"); aOutputWriter.WriteLine("out DX, AL"); // (hi byte) aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 3).ToString("X")); aOutputWriter.WriteLine("mov al, 0x03"); aOutputWriter.WriteLine("out DX, AL"); // 8 bits, no parity, one stop bit aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 2).ToString("X")); aOutputWriter.WriteLine("mov al, 0xC7"); aOutputWriter.WriteLine("out DX, AL"); // Enable FIFO, clear them, with 14-byte threshold aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 4).ToString("X")); aOutputWriter.WriteLine("mov al, 0x03"); aOutputWriter.WriteLine("out DX, AL"); // IRQ-s enabled, RTS/DSR set } aOutputWriter.WriteLine(" call " + EntryPointName); aOutputWriter.WriteLine(" .loop:"); aOutputWriter.WriteLine(" cli"); aOutputWriter.WriteLine(" hlt"); aOutputWriter.WriteLine(" jmp .loop"); aOutputWriter.WriteLine(" "); if (mComNumber > 0) { var xStub = new DebugStub(); xStub.Main(mComPortAddresses[mComNumber - 1]); } } aOutputWriter.WriteLine(xAsm.GetContents()); } } protected override void EmitDataSectionHeader(string aGroup, TextWriter aOutputWriter) { base.EmitDataSectionHeader(aGroup, aOutputWriter); if (aGroup == MainGroup) { aOutputWriter.WriteLine("section .data"); aOutputWriter.WriteLine("_start: "); aOutputWriter.WriteLine("; multiboot header "); aOutputWriter.WriteLine("MBFLAGS equ 0x03 ; 4KB aligned modules etc., full memory info, "); aOutputWriter.WriteLine(" ; use special header (see below) "); aOutputWriter.WriteLine("dd 0x1BADB002 ; multiboot signature "); aOutputWriter.WriteLine("dd MBFLAGS ; 4kb page aligment for modules, supply memory info "); aOutputWriter.WriteLine("dd -0x1BADB002-MBFLAGS ; checksum=-(FLAGS+0x1BADB002) "); aOutputWriter.WriteLine("; other data - that is the additional (optional) header which helps to load "); aOutputWriter.WriteLine("; the kernel. "); //aOutputWriter.WriteLine(" dd _start ; header_addr "); //aOutputWriter.WriteLine(" dd _start ; load_addr "); //aOutputWriter.WriteLine(" dd _end_data ; load_end_addr "); //aOutputWriter.WriteLine(" dd _end ; bss_end_addr "); //aOutputWriter.WriteLine(" dd Kernel_Start ; entry "); aOutputWriter.WriteLine("; end of header "); //aOutputWriter.WriteLine("mb_info multiboot_info"); aOutputWriter.WriteLine("MultiBootInfo_Memory_High dd 0"); aOutputWriter.WriteLine("MultiBootInfo_Memory_Low dd 0"); if (Signature != null && Signature.Length > 0) { aOutputWriter.WriteLine("{0} db {1}", SignatureLabelName, Signature.Aggregate("", (r, b) => r + b + ",") + "0"); } aOutputWriter.WriteLine("DebugTraceMode dd 1"); // Tracing: On, Off aOutputWriter.WriteLine("DebugStatus dd 0"); // Run, Break, Stepping aOutputWriter.WriteLine("DebugRunning dd 0"); // 0 = Not in, 1 = already running aOutputWriter.WriteLine("DebugSuspendLevel dd 0"); // Nesting control for non steppable routines aOutputWriter.WriteLine("DebugResumeLevel dd 0"); // Nesting control for non steppable routines aOutputWriter.WriteLine("DebugEIP dd 0"); // Last EIP value aOutputWriter.WriteLine("InterruptsEnabledFlag dd 0"); aOutputWriter.WriteLine("DebugTraceSent dd 0"); } } protected override void EmitIDataSectionHeader(string aGroup, TextWriter aOutputWriter) { } protected override void EmitDataSectionFooter(string aGroup, TextWriter aOutputWriter) { base.EmitDataSectionFooter(aGroup, aOutputWriter); if (aGroup == MainGroup) { aOutputWriter.WriteLine(""); aOutputWriter.WriteLine(";--- bss --- place r*, d* ? directives here, so that you'll have a BSS. "); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine("Before_Kernel_Stack:"); //aOutputWriter.WriteLine("times 50000 resb 0 ; our own stack "); aOutputWriter.WriteLine("TIMES 0x50000 db 0"); aOutputWriter.WriteLine("Kernel_Stack: "); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine("_end: ; end of BSS - here's the virtual and logical end."); } } protected override void EmitHeader(string aGroup, TextWriter aOutputWriter) { //mOutputWriter.WriteLine("format ms coff "); //mOutputWriter.WriteLine("org 0220000h ; the best place to load our kernel to. "); aOutputWriter.WriteLine("use32 ; the kernel will be run in 32-bit protected mode, "); aOutputWriter.WriteLine(""); aOutputWriter.WriteLine("%ifdef {0}", GetValidGroupName(aGroup)); aOutputWriter.WriteLine("%else"); aOutputWriter.WriteLine(" %define {0} 1", GetValidGroupName(aGroup)); aOutputWriter.WriteLine(""); } protected override void EmitIncludes(string aGroup, TextWriter aOutputWriter) { foreach (string xInclude in (from item in Includes where String.Equals(item.Key, aGroup, StringComparison.InvariantCultureIgnoreCase) select item.Value).Distinct(StringComparer.InvariantCultureIgnoreCase)) { aOutputWriter.WriteLine("%include '{0}'", xInclude); } } protected override void EmitFooter(string aGroup, TextWriter aOutputWriter) { if (aGroup == MainGroup) { aOutputWriter.WriteLine("_end_data: ; -- end of CODE+DATA "); } aOutputWriter.WriteLine("%endif"); } } }