mirror of
https://github.com/danbulant/Cosmos
synced 2026-06-01 22:00:44 +00:00
269 lines
13 KiB
C#
269 lines
13 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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namespace Indy.IL2CPU.Assembler.X86 {
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public class Assembler: Indy.IL2CPU.Assembler.Assembler {
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public const string BreakMethodName = "_CODE_REQUESTED_BREAK_";
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private byte? mComNumber;
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protected int[] mComPortAddress = { 0x3F8, 0x2F8, 0x3E8, 0x2E8 };
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public Assembler(Func<string, string> aGetStreamForGroup, bool aInMetalMode, byte? aComNumber)
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: base(aGetStreamForGroup, aInMetalMode) {
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mComNumber = aComNumber;
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}
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public Assembler(Func<string, string> aGetStreamForGroup)
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: base(aGetStreamForGroup) {
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}
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private static string GetValidGroupName(string aGroup) {
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return aGroup.Replace('-','_').Replace('.', '_');
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}
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protected override void EmitCodeSectionHeader(string aGroup, StreamWriter aOutputWriter) {
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base.EmitCodeSectionHeader(aGroup, aOutputWriter);
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aOutputWriter.WriteLine("section .text");
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("global Kernel_Start");
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aOutputWriter.WriteLine("Kernel_Start: ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("; MultiBoot-compliant loader (e.g. GRUB or X.exe) provides info in registers: ");
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aOutputWriter.WriteLine("; EBX=multiboot_info ");
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aOutputWriter.WriteLine("; EAX=0x2BADB002 - check if it's really Multiboot loader ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine(" ;- copy mb info - some stuff for you ");
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//aOutputWriter.WriteLine(" mov mb_info, ebx");
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aOutputWriter.WriteLine(" add ebx, 4");
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aOutputWriter.WriteLine(" mov dword eax, [ebx]");
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aOutputWriter.WriteLine(" mov dword [MultiBootInfo_Memory_Low], eax");
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aOutputWriter.WriteLine(" add ebx, 4");
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aOutputWriter.WriteLine(" mov dword eax, [ebx]");
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aOutputWriter.WriteLine(" mov dword [MultiBootInfo_Memory_High], eax");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine(" mov esp,Kernel_Stack ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("; some more startups todo");
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aOutputWriter.WriteLine(" cli");
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//aOutputWriter.WriteLine(" push ebx");
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if (mComNumber != null) {
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int xComAddr = mComPortAddress[mComNumber.Value - 1];
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 1).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x00");
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aOutputWriter.WriteLine("out DX, AL"); // disable all interrupts
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 3).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x80");
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aOutputWriter.WriteLine("out DX, AL"); // Enable DLAB (set baud rate divisor)
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 0).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x01");
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aOutputWriter.WriteLine("out DX, AL"); // Set divisor (lo byte)
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 1).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x00");
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aOutputWriter.WriteLine("out DX, AL"); // (hi byte)
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 3).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x03");
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aOutputWriter.WriteLine("out DX, AL"); // 8 bits, no parity, one stop bit
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 2).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0xC7");
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aOutputWriter.WriteLine("out DX, AL"); // Enable FIFO, clear them, with 14-byte threshold
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aOutputWriter.WriteLine("mov dx, 0x{0}", (xComAddr + 4).ToString("X"));
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aOutputWriter.WriteLine("mov al, 0x03");
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aOutputWriter.WriteLine("out DX, AL"); // IRQ-s enabled, RTS/DSR set
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}
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aOutputWriter.WriteLine(" call " + EntryPointName);
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aOutputWriter.WriteLine(" .loop:");
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aOutputWriter.WriteLine(" cli");
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aOutputWriter.WriteLine(" hlt");
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aOutputWriter.WriteLine(" jmp .loop");
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aOutputWriter.WriteLine(" ");
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aOutputWriter.WriteLine(" " + BreakMethodName + ":");
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aOutputWriter.WriteLine(" ret");
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aOutputWriter.WriteLine(" ");
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if (mComNumber != null) {
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int xComAddr = mComPortAddress[mComNumber.Value - 1];
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aOutputWriter.WriteLine("WriteByteToComPort:");
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aOutputWriter.WriteLine(" WriteByteToComPort_Wait:");
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aOutputWriter.WriteLine(" mov dx, " + (xComAddr + 5));
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aOutputWriter.WriteLine(" in al, dx");
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aOutputWriter.WriteLine(" test al, 0x20");
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aOutputWriter.WriteLine(" je WriteByteToComPort_Wait");
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aOutputWriter.WriteLine(" mov dx, " + xComAddr);
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aOutputWriter.WriteLine(" mov eax, [esp + 4]");
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aOutputWriter.WriteLine(" out dx, al");
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aOutputWriter.WriteLine(" ret 4");
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aOutputWriter.WriteLine("DebugWriteEIP:");
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aOutputWriter.WriteLine(" mov al, [ebp+3]");
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aOutputWriter.WriteLine(" push eax");
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aOutputWriter.WriteLine(" call WriteByteToComPort");
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aOutputWriter.WriteLine(" mov al, [ebp+2]");
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aOutputWriter.WriteLine(" push eax");
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aOutputWriter.WriteLine(" call WriteByteToComPort");
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aOutputWriter.WriteLine(" mov al, [ebp+1]");
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aOutputWriter.WriteLine(" push eax");
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aOutputWriter.WriteLine(" call WriteByteToComPort");
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aOutputWriter.WriteLine(" mov al, [ebp]");
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aOutputWriter.WriteLine(" push eax");
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aOutputWriter.WriteLine(" call WriteByteToComPort");
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aOutputWriter.WriteLine(" ret");
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aOutputWriter.WriteLine("DebugPoint_WaitCmd:");
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aOutputWriter.WriteLine(" mov dx, " + (xComAddr + 5));
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aOutputWriter.WriteLine(" in al, dx");
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aOutputWriter.WriteLine(" test al, 0x01");
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aOutputWriter.WriteLine(" jz DebugPoint_WaitCmd");
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aOutputWriter.WriteLine(" jmp DebugPoint_ProcessCmd");
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aOutputWriter.WriteLine("DebugPoint__:");
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aOutputWriter.WriteLine(" PUSHAD");
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aOutputWriter.WriteLine(" mov ebp, esp");
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aOutputWriter.WriteLine(" add ebp, 32");
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// Check TraceMode
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aOutputWriter.WriteLine(" mov dword eax, [TraceMode]");
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aOutputWriter.WriteLine(" cmp al, 1"); // if 1, no tracing
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aOutputWriter.WriteLine(" je DebugPoint_NoTrace");
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//
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aOutputWriter.WriteLine(" call DebugWriteEIP");
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//
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aOutputWriter.WriteLine(" mov dword eax, [TraceMode]");
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aOutputWriter.WriteLine(" cmp al, 4");
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aOutputWriter.WriteLine(" je DebugPoint_WaitCmd");
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aOutputWriter.WriteLine(" DebugPoint_NoTrace:");
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//// Is there a new incoming command?
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aOutputWriter.WriteLine(" DebugPoint_CheckCmd:");
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aOutputWriter.WriteLine(" mov dx, " + (xComAddr + 5));
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aOutputWriter.WriteLine(" in al, dx");
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aOutputWriter.WriteLine(" test al, 0x01");
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aOutputWriter.WriteLine(" jz DebugPoint_AfterCmd");
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aOutputWriter.WriteLine("DebugPoint_ProcessCmd:");
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aOutputWriter.WriteLine(" mov dx, " + xComAddr);
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aOutputWriter.WriteLine(" in al, dx");
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aOutputWriter.WriteLine(" cmp al, 1"); // Turn Full Tracing off
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aOutputWriter.WriteLine(" jne DebugPoint_Cmd02");
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aOutputWriter.WriteLine(" mov dword [TraceMode], 1");
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aOutputWriter.WriteLine(" jmp DebugPoint_CheckCmd");
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//
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aOutputWriter.WriteLine("DebugPoint_Cmd02:");
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aOutputWriter.WriteLine(" cmp al, 2"); // Turn Full Tracing on
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aOutputWriter.WriteLine(" jne DebugPoint_Cmd03");
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aOutputWriter.WriteLine(" mov dword [TraceMode], 2");
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aOutputWriter.WriteLine(" jmp DebugPoint_CheckCmd");
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//
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aOutputWriter.WriteLine("DebugPoint_Cmd03:");
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aOutputWriter.WriteLine(" cmp al, 3"); // Step one
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aOutputWriter.WriteLine(" jne DebugPoint_Cmd04");
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aOutputWriter.WriteLine(" mov dword [TraceMode], 4");
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aOutputWriter.WriteLine(" jmp DebugPoint_AfterCmd");
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//
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aOutputWriter.WriteLine("DebugPoint_Cmd04:");
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aOutputWriter.WriteLine(" cmp al, 4"); // Immediate Break
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aOutputWriter.WriteLine(" jne DebugPoint_Cmd05");
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aOutputWriter.WriteLine(" mov dword [TraceMode], 4");
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aOutputWriter.WriteLine(" jmp DebugPoint_WaitCmd");
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//
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aOutputWriter.WriteLine("DebugPoint_Cmd05:");
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// -Evaluate variables
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// -Step to next debug call
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// Break points
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// Immediate break
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aOutputWriter.WriteLine("DebugPoint_AfterCmd:");
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// TraceMode
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// 1 - No tracing
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// 2 - Tracing
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// 3 -
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// 4 - Break and wait
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aOutputWriter.WriteLine(" POPAD");
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aOutputWriter.WriteLine(" ret");
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}
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}
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}
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protected override void EmitDataSectionHeader(string aGroup, StreamWriter aOutputWriter) {
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base.EmitDataSectionHeader(aGroup, aOutputWriter);
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("section .data");
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aOutputWriter.WriteLine("_start: ");
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aOutputWriter.WriteLine("; multiboot header ");
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aOutputWriter.WriteLine("MBFLAGS equ 0x03 ; 4KB aligned modules etc., full memory info, ");
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aOutputWriter.WriteLine(" ; use special header (see below) ");
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aOutputWriter.WriteLine("dd 0x1BADB002 ; multiboot signature ");
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aOutputWriter.WriteLine("dd MBFLAGS ; 4kb page aligment for modules, supply memory info ");
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aOutputWriter.WriteLine("dd -0x1BADB002-MBFLAGS ; checksum=-(FLAGS+0x1BADB002) ");
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aOutputWriter.WriteLine("; other data - that is the additional (optional) header which helps to load ");
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aOutputWriter.WriteLine("; the kernel. ");
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//aOutputWriter.WriteLine(" dd _start ; header_addr ");
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//aOutputWriter.WriteLine(" dd _start ; load_addr ");
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//aOutputWriter.WriteLine(" dd _end_data ; load_end_addr ");
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//aOutputWriter.WriteLine(" dd _end ; bss_end_addr ");
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//aOutputWriter.WriteLine(" dd Kernel_Start ; entry ");
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aOutputWriter.WriteLine("; end of header ");
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//aOutputWriter.WriteLine("mb_info multiboot_info");
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aOutputWriter.WriteLine("MultiBootInfo_Memory_High dd 0");
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aOutputWriter.WriteLine("MultiBootInfo_Memory_Low dd 0");
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if (Signature != null && Signature.Length > 0) {
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aOutputWriter.WriteLine("{0} db {1}", SignatureLabelName, Signature.Aggregate<byte, string>("", (r, b) => r + b + ",") + "0");
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}
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aOutputWriter.WriteLine("TraceMode dd 1");
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}
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}
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protected override void EmitIDataSectionHeader(string aGroup, StreamWriter aOutputWriter) {
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}
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protected override void EmitDataSectionFooter(string aGroup, StreamWriter aOutputWriter) {
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base.EmitDataSectionFooter(aGroup, aOutputWriter);
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine(";--- bss --- place r*, d* ? directives here, so that you'll have a BSS. ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("Before_Kernel_Stack:");
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//aOutputWriter.WriteLine("times 50000 resb 0 ; our own stack ");
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aOutputWriter.WriteLine("TIMES 0x50000 db 0");
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aOutputWriter.WriteLine("Kernel_Stack: ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("_end: ; end of BSS - here's the virtual and logical end.");
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}
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}
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protected override void EmitHeader(string aGroup, StreamWriter aOutputWriter) {
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//mOutputWriter.WriteLine("format ms coff ");
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//mOutputWriter.WriteLine("org 0220000h ; the best place to load our kernel to. ");
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aOutputWriter.WriteLine("use32 ; the kernel will be run in 32-bit protected mode, ");
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aOutputWriter.WriteLine("");
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aOutputWriter.WriteLine("%ifdef {0}", GetValidGroupName(aGroup));
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aOutputWriter.WriteLine("%else");
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aOutputWriter.WriteLine(" %define {0} 1", GetValidGroupName(aGroup));
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aOutputWriter.WriteLine("");
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}
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protected override void EmitIncludes(string aGroup, StreamWriter aOutputWriter) {
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foreach (string xInclude in (from item in Includes
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where String.Equals(item.Key, aGroup, StringComparison.InvariantCultureIgnoreCase)
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select item.Value).Distinct(StringComparer.InvariantCultureIgnoreCase)) {
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aOutputWriter.WriteLine("%include '{0}'", xInclude);
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}
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}
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protected override void EmitFooter(string aGroup, StreamWriter aOutputWriter) {
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if (aGroup == MainGroup) {
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aOutputWriter.WriteLine("_end_data: ; -- end of CODE+DATA ");
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}
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aOutputWriter.WriteLine("%endif");
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}
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protected override void EmitImportMembers(string aGroup, StreamWriter aOutputWriter) {
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if (ImportMembers.Count > 0) {
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throw new Exception("You can't use P/Invoke in OS kernels");
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}
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}
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}
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}
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