X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=Usermode%2FLibraries%2Fld-acess.so_src%2Floadlib.c;h=2a0830302c923e33b1d1bda9717817d6b9e89070;hb=230612b2efeeb769f1d96193ec01b10bd36d9873;hp=54d4c475f7558e8285308709443caa3897ce23f9;hpb=ed7804028b2b11be0703677aa8eb643a811e5027;p=tpg%2Facess2.git

diff --git a/Usermode/Libraries/ld-acess.so_src/loadlib.c b/Usermode/Libraries/ld-acess.so_src/loadlib.c
index 54d4c475..2a083030 100644
--- a/Usermode/Libraries/ld-acess.so_src/loadlib.c
+++ b/Usermode/Libraries/ld-acess.so_src/loadlib.c
@@ -1,194 +1,318 @@
-/*
- AcessOS 1 - Dynamic Loader
- By thePowersGang
-*/
-#include "common.h"
-
-#define DEBUG	0
-
-#if DEBUG
-# define DEBUGS(v...)	SysDebug(v)
-#else
-# define DEBUGS(v...)	
-#endif
-
-// === PROTOTYPES ===
-Uint	IsFileLoaded(char *file);
- int	GetSymbolFromBase(Uint base, char *name, Uint *ret);
-
-// === GLOABLS ===
-#define	MAX_LOADED_LIBRARIES	64
-#define	MAX_STRINGS_BYTES	4096
-struct {
-	Uint	Base;
-	char	*Name;
-}	gLoadedLibraries[MAX_LOADED_LIBRARIES];
-char	gsLoadedStrings[MAX_STRINGS_BYTES];
-char	*gsNextAvailString = gsLoadedStrings;
-//tLoadLib	*gpLoadedLibraries = NULL;
-
-// === CODE ===
-Uint LoadLibrary(char *filename, char *SearchDir, char **envp)
-{
-	char	sTmpName[1024] = "/Acess/Libs/";
-	Uint	iArg;
-	void	(*fEntry)(int, int, char *[], char**);
-	
-	DEBUGS("LoadLibrary: (filename='%s', envp=0x%x)\n", filename, envp);
-	
-	// Create Temp Name
-	strcpy(&sTmpName[12], filename);
-	DEBUGS(" LoadLibrary: sTmpName='%s'\n", sTmpName);
-	
-	if( (iArg = IsFileLoaded(sTmpName)) )
-		return iArg;
-	
-	// Load Library
-	iArg = SysLoadBin(sTmpName, (Uint*)&fEntry);
-	if(iArg == 0) {
-		DEBUGS("LoadLibrary: RETURN 0\n");
-		return 0;
-	}
-	
-	DEBUGS(" LoadLibrary: iArg=0x%x, iEntry=0x%x\n", iArg, fEntry);
-	
-	// Load Symbols
-	fEntry = (void*)DoRelocate( iArg, envp, sTmpName );
-	
-	// Call Entrypoint
-	DEBUGS(" LoadLibrary: '%s' Entry 0x%x\n", filename, fEntry);
-	fEntry(iArg, 0, NULL, envp);
-	
-	DEBUGS("LoadLibrary: RETURN 1\n");
-	return iArg;
+/*
+ AcessOS 1 - Dynamic Loader
+ By thePowersGang
+*/
+#include "common.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include <acess/sys.h>
+
+#define DEBUG	0
+
+#if DEBUG
+# define DEBUGS(v...)	SysDebug(v)
+#else
+# define DEBUGS(v...)	
+#endif
+
+#define MAX_QUEUED_ENTRYPOINTS	8
+
+// === IMPORTS ===
+extern const tLocalExport	caLocalExports[];
+extern const int	ciNumLocalExports;
+extern char	**gEnvP;
+extern char	gLinkedBase[];
+
+// === TYPES ===
+typedef void	tLibEntry(void *, int, char *[], char**);
+
+// === PROTOTYPES ===
+void	*IsFileLoaded(const char *file);
+
+// === GLOABLS ===
+tLoadedLib	gLoadedLibraries[MAX_LOADED_LIBRARIES];
+char	gsLoadedStrings[MAX_STRINGS_BYTES];
+char	*gsNextAvailString = gsLoadedStrings;
+struct sQueuedEntry {
+	void	*Base;
+	tLibEntry	*Entry;
+}	gaQueuedEntrypoints[MAX_QUEUED_ENTRYPOINTS];
+ int	giNumQueuedEntrypoints;
+//tLoadLib	*gpLoadedLibraries = NULL;
+
+// === CODE ===
+void ldacess_DumpLoadedLibraries(void)
+{
+	for( int i = 0; i < MAX_LOADED_LIBRARIES; i ++ )
+	{
+		const tLoadedLib* ll = &gLoadedLibraries[i];
+		if(ll->Base == 0)	break;	// Last entry has Base set to NULL
+		_SysDebug("%p: %s", ll->Base, ll->Name);
+	}
+}
+
+/**
+ * \brief Call queued up entry points (after relocations completed) 
+ */
+void CallQueuedEntrypoints(char **EnvP)
+{
+	while( giNumQueuedEntrypoints )
+	{
+		giNumQueuedEntrypoints --;
+		const struct sQueuedEntry	*qe = &gaQueuedEntrypoints[giNumQueuedEntrypoints];
+		DEBUGS("Calling EP %p for %p", qe->Entry, qe->Base);
+		qe->Entry(qe->Base, 0, NULL, EnvP);
+	}
+}
+
+const char *FindLibrary(char *DestBuf, const char *SoName, const char *ExtraSearchDir)
+{	
+	// -- #1: Executable Specified
+	if(ExtraSearchDir)
+	{
+		strcpy(DestBuf, ExtraSearchDir);
+		strcat(DestBuf, "/");
+		strcat(DestBuf, SoName);
+		if(file_exists(DestBuf))	return DestBuf;
+	}
+	
+	// -- #2: System
+	strcpy(DestBuf, SYSTEM_LIB_DIR);
+	strcat(DestBuf, SoName);
+	if(file_exists(DestBuf))	return DestBuf;
+	
+	// -- #3: Current Directory
+	if(file_exists(SoName))	return SoName;
+	
+	return NULL;
 }
-
-/**
- * \fn Uint IsFileLoaded(char *file)
- * \brief Determine if a file is already loaded
- */
-Uint IsFileLoaded(char *file)
-{
-	 int	i;
-	DEBUGS("IsFileLoaded: (file='%s')\n", file);
-	for( i = 0; i < MAX_LOADED_LIBRARIES; i++ )
-	{
-		if(gLoadedLibraries[i].Base == 0)	break;	// Last entry has Base set to NULL
-		if(strcmp(gLoadedLibraries[i].Name, file) == 0) {
-			DEBUGS("IsFileLoaded: Found %i (0x%x)\n", i, gLoadedLibraries[i].Base);
-			return gLoadedLibraries[i].Base;
-		}
-	}
-	DEBUGS("IsFileLoaded: Not Found\n");
-	return 0;
-}
-
-/**
- * \fn void AddLoaded(char *File, Uint base)
- * \brief Add a file to the loaded list
+
+/**
  */
-void AddLoaded(char *File, Uint base)
-{
-	 int	i, length;
-	char	*name = gsNextAvailString;
-	
-	DEBUGS("AddLoaded: (File='%s', base=0x%x)", File, base);
-	
-	// Find a free slot
-	for( i = 0; i < MAX_LOADED_LIBRARIES; i ++ )
-	{
-		if(gLoadedLibraries[i].Base == 0)	break;
-	}
-	if(i == MAX_LOADED_LIBRARIES) {
-		SysDebug("ERROR - ld-acess.so has run out of load slots!");
-		return;
-	}
-	
-	// Check space in string buffer
-	length = strlen(File);
-	if(&name[length+1] >= &gsLoadedStrings[MAX_STRINGS_BYTES]) {
-		SysDebug("ERROR - ld-acess.so has run out of string buffer memory!");
-		return;
-	}
-	
-	// Set information
-	gLoadedLibraries[i].Base = base;
-	strcpy(name, File);
-	gLoadedLibraries[i].Name = name;
-	gsNextAvailString = &name[length+1];
-	DEBUGS("'%s' (0x%x) loaded as %i\n", name, base, i);
+void *LoadLibrary(const char *SoName, const char *SearchDir, char **envp)
+{
+	char	sTmpName[1024];
+	void	*base;
+	
+	DEBUGS("LoadLibrary: (SoName='%s', SearchDir='%s', envp=%p)", SoName, SearchDir, envp);
+	
+	// Create Temp Name
+	const char *filename = FindLibrary(sTmpName, SoName, SearchDir);
+	if(filename == NULL) {
+		DEBUGS("LoadLibrary: RETURN 0");
+		return 0;
+	}
+	DEBUGS(" LoadLibrary: filename='%s'", filename);
+	
+	if( (base = IsFileLoaded(filename)) )
+		return base;
+
+	DEBUGS(" LoadLibrary: SysLoadBin()");	
+	// Load Library
+	tLibEntry	*fEntry;
+	base = _SysLoadBin(filename, (void**)&fEntry);
+	if(!base) {
+		DEBUGS("LoadLibrary: RETURN 0");
+		return 0;
+	}
+	
+	DEBUGS(" LoadLibrary: iArg=%p, fEntry=%p", base, fEntry);
+	
+	// Load Symbols
+	fEntry = DoRelocate( base, envp, filename );
+	if( !fEntry ) {
+		return 0;
+	}
+	
+	// Call Entrypoint
+	// - TODO: Queue entrypoint calls
+	if( giNumQueuedEntrypoints >= MAX_QUEUED_ENTRYPOINTS ) {
+		SysDebug("ERROR - Maximum number of queued entrypoints exceeded on %p '%s'",
+			base, SoName);
+		return 0;
+	}
+	gaQueuedEntrypoints[giNumQueuedEntrypoints].Base  = base;
+	gaQueuedEntrypoints[giNumQueuedEntrypoints].Entry = fEntry;
+	giNumQueuedEntrypoints ++;
+	
+	DEBUGS("LoadLibrary: RETURN success");
+	return base;
+}
+
+/**
+ * \fn Uint IsFileLoaded(char *file)
+ * \brief Determine if a file is already loaded
+ */
+void *IsFileLoaded(const char *file)
+{
+	DEBUGS("IsFileLoaded: (file='%s')", file);
+
+	// Applications link against either libld-acess.so or ld-acess.so
+	if( strcmp(file, "/Acess/Libs/libld-acess.so") == 0
+	 || strcmp(file, "/Acess/Libs/ld-acess.so") == 0 )
+	{
+		DEBUGS("IsFileLoaded: Found local (%p)", &gLinkedBase);
+		return &gLinkedBase;
+	}
+
+	for( int i = 0; i < MAX_LOADED_LIBRARIES; i++ )
+	{
+		if(gLoadedLibraries[i].Base == 0)	break;	// Last entry has Base set to NULL
+		DEBUGS(" strcmp('%s', '%s')", gLoadedLibraries[i].Name, file);
+		if(strcmp(gLoadedLibraries[i].Name, file) == 0) {
+			DEBUGS("IsFileLoaded: Found %i (%p)", i, gLoadedLibraries[i].Base);
+			return gLoadedLibraries[i].Base;
+		}
+	}
+	DEBUGS("IsFileLoaded: Not Found");
+	return 0;
+}
+
+/**
+ * \fn void AddLoaded(char *File, Uint base)
+ * \brief Add a file to the loaded list
+ */
+void AddLoaded(const char *File, void *base)
+{
+	 int	i, length;
+	char	*name = gsNextAvailString;
+	
+	DEBUGS("AddLoaded: (File='%s', base=%p)", File, base);
+	
+	// Find a free slot
+	for( i = 0; i < MAX_LOADED_LIBRARIES; i ++ )
+	{
+		if(gLoadedLibraries[i].Base == 0)	break;
+	}
+	if(i == MAX_LOADED_LIBRARIES) {
+		SysDebug("ERROR - ld-acess.so has run out of load slots!");
+		return;
+	}
+	
+	// Check space in string buffer
+	length = strlen(File);
+	if(&name[length+1] >= &gsLoadedStrings[MAX_STRINGS_BYTES]) {
+		SysDebug("ERROR - ld-acess.so has run out of string buffer memory!");
+		return;
+	}
+	
+	// Set information
+	gLoadedLibraries[i].Base = base;
+	strcpy(name, File);
+	gLoadedLibraries[i].Name = name;
+	gsNextAvailString = &name[length+1];
+	DEBUGS("'%s' (%p) loaded as %i", name, base, i);
 	return;
-}
-
-/**
- * \fn void Unload(Uint Base)
- */
-void Unload(Uint Base)
-{	
-	 int	i, j;
-	 int	id;
-	char	*str;
-	for( id = 0; id < MAX_LOADED_LIBRARIES; id++ )
-	{
-		if(gLoadedLibraries[id].Base == Base)	break;
-	}
-	if(id == MAX_LOADED_LIBRARIES)	return;
-	
-	// Unload Binary
-	SysUnloadBin( Base );
-	// Save String Pointer
-	str = gLoadedLibraries[id].Name;
-	
-	// Compact Loaded List
-	j = id;
-	for( i = j + 1; i < MAX_LOADED_LIBRARIES; i++, j++ )
-	{
-		if(gLoadedLibraries[i].Base == 0)	break;
-		// Compact String
-		strcpy(str, gLoadedLibraries[i].Name);
-		str += strlen(str)+1;
-		// Compact Entry
-		gLoadedLibraries[j].Base = gLoadedLibraries[i].Base;
-		gLoadedLibraries[j].Name = str;
-	}
-	
-	// NULL Last Entry
-	gLoadedLibraries[j].Base = 0;
-	gLoadedLibraries[j].Name = NULL;
-	// Save next string
-	gsNextAvailString = str;
-}
-
+}
+
+/**
+ * \fn void Unload(Uint Base)
+ */
+void Unload(void *Base)
+{	
+	 int	id;
+	char	*str;
+	for( id = 0; id < MAX_LOADED_LIBRARIES; id++ )
+	{
+		if(gLoadedLibraries[id].Base == Base)	break;
+	}
+	if(id == MAX_LOADED_LIBRARIES)	return;
+	
+	// Unload Binary
+	_SysUnloadBin( Base );
+	// Save String Pointer
+	str = gLoadedLibraries[id].Name;
+	
+	// Compact Loaded List
+	int j = id;
+	for( int i = j + 1; i < MAX_LOADED_LIBRARIES; i++, j++ )
+	{
+		if(gLoadedLibraries[i].Base == 0)	break;
+		// Compact String
+		strcpy(str, gLoadedLibraries[i].Name);
+		str += strlen(str)+1;
+		// Compact Entry
+		gLoadedLibraries[j].Base = gLoadedLibraries[i].Base;
+		gLoadedLibraries[j].Name = str;
+	}
+	
+	// NULL Last Entry
+	gLoadedLibraries[j].Base = 0;
+	gLoadedLibraries[j].Name = NULL;
+	// Save next string
+	gsNextAvailString = str;
+}
+
 /**
- \fn Uint GetSymbol(char *name)
+ \fn Uint GetSymbol(const char *name)
  \brief Gets a symbol value from a loaded library
 */
-Uint GetSymbol(char *name)
-{
-	 int	i;
-	Uint	ret;
-	for(i=0;i<sizeof(gLoadedLibraries)/sizeof(gLoadedLibraries[0]);i++)
-	{
-		if(gLoadedLibraries[i].Base == 0)	break;
+int GetSymbol(const char *name, void **Value, size_t *Size, void *IgnoreBase)
+{
+	ASSERT(name);
+	ASSERT(Value);
+	ASSERT(Size);
+	//SysDebug("GetSymbol: (%s)");
+	for( int i = 0; i < ciNumLocalExports; i ++ )
+	{
+		const tLocalExport* le = &caLocalExports[i];
+		if( strcmp(le->Name, name) == 0 ) {
+			*Value = le->Value;
+			if(Size)
+				*Size = 0;
+			DEBUGS("'%s' = Local %p+%#x", name, le->Value, 0);
+			return 1;
+		}
+	}
+
+	bool have_weak = false;	
+	for(int i = 0; i < MAX_LOADED_LIBRARIES && gLoadedLibraries[i].Base != 0; i ++)
+	{
+		const tLoadedLib* ll = &gLoadedLibraries[i];
+		// Allow ignoring the current module
+		if( ll->Base == IgnoreBase ) {
+			//SysDebug("GetSymbol: Ignore %p", gLoadedLibraries[i].Base);
+			continue ;
+		}
 		
-		SysDebug(" GetSymbol: Trying 0x%x, '%s'\n",
-			gLoadedLibraries[i].Base, gLoadedLibraries[i].Name);
-		if(GetSymbolFromBase(gLoadedLibraries[i].Base, name, &ret))	return ret;
-	}
-	SysDebug("GetSymbol: === Symbol '%s' not found ===\n", name);
-	return 0;
+		//SysDebug(" GetSymbol: Trying 0x%x, '%s'", ll->Base, ll->Name);
+		void	*tmpval;
+		size_t	tmpsize;
+		int rv = GetSymbolFromBase(ll->Base, name, &tmpval, &tmpsize);
+		if(rv)
+		{
+			*Value = tmpval;
+			*Size = tmpsize;
+			if( rv == 1 ) {
+				DEBUGS("'%s' = %p '%s' Strong %p+%#x", name, ll->Base, ll->Name, *Value, *Size);
+				return 1;
+			}
+			have_weak = true;
+		}
+	}
+	if(have_weak) {
+		DEBUGS("'%s' = Weak %p+%#x", name, *Value, *Size);
+		return 2;
+	}
+	else {
+		DEBUGS("'%s' = ?", name);
+		return 0;
+	}
 }
 
 /**
  \fn int GetSymbolFromBase(Uint base, char *name, Uint *ret)
  \breif Gets a symbol from a specified library
 */
-int GetSymbolFromBase(Uint base, char *name, Uint *ret)
+int GetSymbolFromBase(void *base, const char *name, void **ret, size_t *Size)
 {
-	if(*(Uint32*)base == (0x7F|('E'<<8)|('L'<<16)|('F'<<24)))
-		return ElfGetSymbol(base, name, ret);
-	if(*(Uint16*)base == ('M'|('Z'<<8)))
-		return PE_GetSymbol(base, name, ret);
+	uint8_t	*hdr = base;
+	if(hdr[0] == 0x7F && hdr[1] == 'E' && hdr[2] == 'L' && hdr[3] == 'F')
+		return ElfGetSymbol(base, name, ret, Size);
+	if(hdr[0] == 'M' && hdr[1] == 'Z')
+		return PE_GetSymbol(base, name, ret, Size);
+	SysDebug("Unknown type at %p (%02x %02x %02x %02x)", base,
+		hdr[0], hdr[1], hdr[2], hdr[3]);
 	return 0;
 }