mirror of
https://github.com/danbulant/Cosmos
synced 2026-06-03 14:50:42 +00:00
152 lines
No EOL
6.9 KiB
C#
152 lines
No EOL
6.9 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.Native {
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public class Assembler: X86.Assembler {
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public const string BreakMethodName = "_CODE_REQUESTED_BREAK_";
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public Assembler(Func<string, string> aGetStreamForGroup, bool aInMetalMode)
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: base(aGetStreamForGroup, aInMetalMode) {
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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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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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aOutputWriter.WriteLine(" xchg bx, bx");
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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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}
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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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}
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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 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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base.EmitFooter(aGroup, aOutputWriter);
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}
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protected override void EmitHeader(string aGroup, StreamWriter aOutputWriter) {
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base.EmitHeader(aGroup, 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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//mOutputWriter.WriteLine("use32 ; the kernel will be run in 32-bit protected mode, ");
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aOutputWriter.WriteLine("");
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// List<string> xTheLabels = new List<string>();
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// string mLastRealLabel = "";
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// foreach (IL2CPU.Assembler.Instruction x in mInstructions) {
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// Label xLabel = x as Label;
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// if (xLabel != null) {
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// if (!xLabel.Name.StartsWith(".")) {
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// mLastRealLabel = xLabel.Name;
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// xTheLabels.Add(xLabel.Name);
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// } else {
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// xTheLabels.Add(mLastRealLabel + "@@" + xLabel.Name.Substring(1));
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// }
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// }
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// }
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// if (xTheLabels.Count > 0) {
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// mOutputWriter.WriteLine("include 'export.inc'");
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// mOutputWriter.WriteLine("section '.edata' export data readable");
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// mOutputWriter.WriteLine("");
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// mOutputWriter.WriteLine("\texport 'OUTPUT.dll', \\");
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// for (int i = 0; i < xTheLabels.Count; i++) {
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// if (i == (xTheLabels.Count - 1)) {
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// mOutputWriter.WriteLine("\t\t {0},'{1}'", xTheLabels[i].Replace("@@", "."), xTheLabels[i]);
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// } else {
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// mOutputWriter.WriteLine("\t\t{0},'{1}', \\", xTheLabels[i].Replace("@@", "."), xTheLabels[i]);
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// }
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// public entry as 'entry'
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//mOutputWriter.WriteLine("\tpublic {0} as '{0}'", xTheLabels[i].Replace("@@", "."), xTheLabels[i]);
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// }
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// }
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//mOutputWriter.WriteLine("section '.code' code readable executable");
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aOutputWriter.WriteLine("");
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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 external libraries in OS kernels");
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}
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}
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}
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} |