Processes now remember the memory segments it has loaded.

sortix/Makefile

@@ -44,7 +44,7 @@ DEFINES:=$(DEFINES) -DINITRD
 CPPFLAGSRELEASE=-s -O3
 CPPFLAGSDEBUG=
 CPPFLAGS=-I.. -I. $(CPUDEFINES) $(CPUFLAGS) -std=gnu++0x -Wall -Wextra -nostdlib -fno-builtin -nostartfiles -nodefaultlibs -fno-exceptions -fno-rtti -fno-stack-protector $(DEFINES) $(CPPFLAGSRELEASE)
-OBJS=$(CPUOBJS) kernel.o descriptor_tables.o isr.o time.o log.o iprintable.o panic.o keyboard.o memorymanagement.o scheduler.o syscall.o application.o pong.o sound.o pci.o uart.o conway.o test.o http.o vgaterminal.o serialterminal.o descriptors.o device.o vga.o elf.o ../libmaxsi/libmaxsi-sortix.a
+OBJS=$(CPUOBJS) kernel.o descriptor_tables.o isr.o time.o log.o iprintable.o panic.o keyboard.o memorymanagement.o scheduler.o syscall.o application.o pong.o sound.o pci.o uart.o conway.o test.o http.o vgaterminal.o serialterminal.o descriptors.o device.o vga.o elf.o process.o ../libmaxsi/libmaxsi-sortix.a
 JSOBJS:=$(subst .o,-js.o,$(OBJS))
 
 all: sortix.bin

sortix/elf.cpp

@@ -27,6 +27,7 @@
 #include "elf.h"
 #include "memorymanagement.h"
 #include "panic.h"
+#include "process.h"
 
 using namespace Maxsi;
 
@@ -34,7 +35,7 @@ namespace Sortix
 {
 	namespace ELF
 	{
-		addr_t Construct32(const void* file, size_t filelen)
+		addr_t Construct32(Process* process, const void* file, size_t filelen)
 		{
 			if ( filelen < sizeof(Header32) ) { return 0; }
 			const Header32* header = (const Header32*) file;
@@ -55,7 +56,10 @@ namespace Sortix
 			// Validate that all program headers are present.
 			uint16_t numprogheaders = header->numprogramheaderentries;
 			size_t neededfilelen = phtbloffset + numprogheaders * phsize;
-			if ( filelen < neededfilelen ) { return 0; } 
+			if ( filelen < neededfilelen ) { return 0; }
+
+			// Reset the current address space.
+			process->ResetAddressSpace();
 
 			// Create all the segments in the final process.
 			// TODO: Handle errors on bad/malicious input or out-of-mem!
@@ -70,11 +74,28 @@ namespace Sortix
 				ASSERT(pht->offset + pht->filesize < filelen);
 				ASSERT(pht->filesize <= pht->memorysize);
 
+				ProcessSegment* segment = new ProcessSegment;
+				if ( segment == NULL ) { return 0; }
+				segment->position = mapto;
+				segment->size = Page::AlignUp(mapbytes);
+
+				if ( segment->Intersects(process->segments) )
+				{
+					delete segment;
+					return 0;
+				}
+
 				if ( !VirtualMemory::MapRangeUser(mapto, mapbytes) )
 				{
-					PanicF("Could not user-map at %p and %zu bytes onwards", mapto, mapbytes);
+					return 0;
 				}
 
+				// Insert our newly allocated memory into the processes segment
+				// list such that it can be reclaimed later.
+				if ( process->segments ) { process->segments->prev = segment;}
+				segment->next = process->segments;
+				process->segments = segment;
+
 				// Copy as much data as possible and memset the rest to 0.
 				byte* memdest = (byte*) virtualaddr;
 				byte* memsource = (byte*) ( (addr_t)file + pht->offset);
@@ -82,18 +103,15 @@ namespace Sortix
 				Memory::Set(memdest + pht->filesize, 0, pht->memorysize - pht->filesize);
 			}
 
-			// MEMORY LEAK: There is no system in place to delete the sections
-			// once the process has terminated.
-
 			return entry;
 		}
 
-		addr_t Construct64(const void* /*file*/, size_t /*filelen*/)
+		addr_t Construct64(Process* /*process*/, const void* /*file*/, size_t /*filelen*/)
 		{
 			return 0;
 		}
 
-		addr_t Construct(const void* file, size_t filelen)
+		addr_t Construct(Process* process, const void* file, size_t filelen)
 		{
 			if ( filelen < sizeof(Header) ) { return 0; }
 			const Header* header = (const Header*) file;
@@ -107,9 +125,9 @@ namespace Sortix
 			switch ( header->fileclass )
 			{
 				case CLASS32:
-					return Construct32(file, filelen);
+					return Construct32(process, file, filelen);
 				case CLASS64:
-					return Construct64(file, filelen);
+					return Construct64(process, file, filelen);
 				default:
 					return 0;
 			}		

sortix/elf.h

@@ -27,6 +27,8 @@
 
 namespace Sortix
 {
+	class Process;
+
 	namespace ELF
 	{
 		struct Header
@@ -117,7 +119,7 @@ namespace Sortix
 
 		// Reads the elf file into the current address space and returns the
 		// entry address of the program, or 0 upon failure.
-		addr_t Construct(const void* file, size_t filelen);
+		addr_t Construct(Process* process, const void* file, size_t filelen);
 	}
 }
 

sortix/kernel.cpp

@@ -252,7 +252,7 @@ namespace Sortix
 
 		if ( initrd != NULL )
 		{
-			initstart = (Thread::Entry) ELF::Construct(initrd, initrdsize);
+			initstart = (Thread::Entry) ELF::Construct(process, initrd, initrdsize);
 			if ( initstart == NULL )
 			{
 				Panic("kernel.cpp: Could not construct ELF program");

sortix/process.cpp

@@ -0,0 +1,78 @@
+/******************************************************************************
+
+	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
+
+	This file is part of Sortix.
+
+	Sortix is free software: you can redistribute it and/or modify it under the
+	terms of the GNU General Public License as published by the Free Software
+	Foundation, either version 3 of the License, or (at your option) any later
+	version.
+
+	Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
+	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+	FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+	details.
+
+	You should have received a copy of the GNU General Public License along
+	with Sortix. If not, see <http://www.gnu.org/licenses/>.
+
+	process.cpp
+	Describes a process belonging to a subsystem.
+
+******************************************************************************/
+
+#include "platform.h"
+#include <libmaxsi/memory.h>
+#include "process.h"
+#include "memorymanagement.h"
+
+namespace Sortix
+{
+	bool ProcessSegment::Intersects(ProcessSegment* segments)
+	{
+		for ( ProcessSegment* tmp = segments; tmp != NULL; tmp = tmp->next )
+		{
+			if ( tmp->position < position + size &&
+			     position < tmp->position + tmp->size )
+			{
+				return true;
+			}
+		}
+
+		if ( next ) { return next->Intersects(segments); }
+
+		return false;
+	}
+
+	Process::Process(addr_t addrspace)
+	{
+		_addrspace = addrspace;
+		_endcodesection = 0x400000UL;
+		segments = NULL;
+	}
+
+	Process::~Process()
+	{
+		ResetAddressSpace();
+
+		// Avoid memory leaks.
+		ASSERT(segments == NULL);
+
+		// TODO: Delete address space!
+	}
+
+	void Process::ResetAddressSpace()
+	{
+		ProcessSegment* tmp = segments;
+		while ( tmp != NULL )
+		{
+			VirtualMemory::UnmapRangeUser(tmp->position, tmp->size);
+			ProcessSegment* todelete = tmp;
+			tmp = tmp->next;
+			delete todelete;
+		}
+
+		segments = NULL;
+	}
+}

sortix/process.h

@@ -31,40 +31,50 @@ namespace Sortix
 {
 	class Thread;
 	class Process;
-	class MountPoint;
-	class User;
-	class System;
-	class DevBuffer;
+	struct ProcessSegment;
+
+	struct ProcessSegment
+	{
+	public:
+		ProcessSegment() : prev(NULL), next(NULL) { }
+
+	public:
+		ProcessSegment* prev;
+		ProcessSegment* next;
+		addr_t position;
+		size_t size;
+
+	public:
+		 bool Intersects(ProcessSegment* segments);
+
+	};
 
 	class Process
 	{
 	public:
-		// TODO: Make this possible from an async syscall!
-		//bool CreateProcess(System* system, DevBuffer* image);
+		Process(addr_t addrspace);
+		~Process();
+
+	private:
+		addr_t _addrspace;
 
 	public:
-		DescriptorTable _descs;
-
-	private:
-		MountPoint* _rootFS;
-		User* _user;
-		System* _system;
+		DescriptorTable descriptors;
+		ProcessSegment* segments;
 
 	public:
-		MountPoint* GetRootFS() { _rootFS; }
-		User* GetUser() { _user; }
-		System* GetSystem() { _system; }
+		addr_t _endcodesection; // HACK
 
-	private:
-		Process* _parent;
-		Process* _child;
-		Process* _prevSibling;
-		Process* _nextSibling;
+	public:
+		addr_t GetAddressSpace() { return _addrspace; }
+		void ResetAddressSpace();
 
-	private:
-		Thread* _firstThread;
+	public:
+		bool IsSane() { return _addrspace != 0; }
 
 	};
+
+	Process* CurrentProcess();
 }
 
 #endif

sortix/scheduler.cpp

@@ -38,17 +38,6 @@ namespace Sortix
 {
 	const bool LOG_SWITCHING = false;
 
-	Process::Process(addr_t addrspace)
-	{
-		_addrspace = addrspace;
-		_endcodesection = 0x400000UL;
-	}
-
-	Process::~Process()
-	{
-		// TODO: Delete address space!
-	}
-
 	namespace Scheduler
 	{
 		// This is a very small thread that does absoluting nothing!

sortix/scheduler.h

@@ -25,35 +25,12 @@
 #ifndef SORTIX_SCHEDULER_H
 #define SORTIX_SCHEDULER_H
 
+#include "process.h"
 #include "descriptors.h"
 
 namespace Sortix
 {
 	class Thread;
-	class Process;
-
-	class Process
-	{
-	public:
-		Process(addr_t addrspace);
-		~Process();
-
-	private:
-		addr_t _addrspace;
-
-	public:
-		DescriptorTable descriptors;
-
-	public:
-		addr_t _endcodesection; // HACK
-
-	public:
-		addr_t GetAddressSpace() { return _addrspace; }
-
-	public:
-		bool IsSane() { return _addrspace != 0; }
-
-	};
 
 	class Thread
 	{
@@ -138,7 +115,6 @@ namespace Sortix
 
 	// Scheduling
 	Thread* CurrentThread();
-	Process* CurrentProcess();
 }
 
 #endif