fyrenmoo@3129: /**
fyrenmoo@3129:  * vim: set ts=4 sw=4 tw=99 noet :
fyrenmoo@3129:  * =============================================================================
fyrenmoo@3129:  * SourceMod
fyrenmoo@3129:  * Copyright (C) 2004-2010 AlliedModders LLC.  All rights reserved.
fyrenmoo@3129:  * =============================================================================
fyrenmoo@3129:  *
fyrenmoo@3129:  * This program is free software; you can redistribute it and/or modify it under
fyrenmoo@3129:  * the terms of the GNU General Public License, version 3.0, as published by the
fyrenmoo@3129:  * Free Software Foundation.
fyrenmoo@3129:  * 
fyrenmoo@3129:  * This program is distributed in the hope that it will be useful, but WITHOUT
fyrenmoo@3129:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
fyrenmoo@3129:  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
fyrenmoo@3129:  * details.
fyrenmoo@3129:  *
fyrenmoo@3129:  * You should have received a copy of the GNU General Public License along with
fyrenmoo@3129:  * this program.  If not, see <http://www.gnu.org/licenses/>.
fyrenmoo@3129:  *
fyrenmoo@3129:  * As a special exception, AlliedModders LLC gives you permission to link the
fyrenmoo@3129:  * code of this program (as well as its derivative works) to "Half-Life 2," the
fyrenmoo@3129:  * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
fyrenmoo@3129:  * by the Valve Corporation.  You must obey the GNU General Public License in
fyrenmoo@3129:  * all respects for all other code used.  Additionally, AlliedModders LLC grants
fyrenmoo@3129:  * this exception to all derivative works.  AlliedModders LLC defines further
fyrenmoo@3129:  * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
fyrenmoo@3129:  * or <http://www.sourcemod.net/license.php>.
fyrenmoo@3129:  */
fyrenmoo@3129: 
fyrenmoo@3129: #include "MemoryUtils.h"
fyrenmoo@3129: #ifdef PLATFORM_LINUX
fyrenmoo@3129: #include <fcntl.h>
fyrenmoo@3129: #include <link.h>
fyrenmoo@3129: #include <sys/mman.h>
fyrenmoo@3129: 
fyrenmoo@3129: #define PAGE_SIZE			4096
fyrenmoo@3129: #define PAGE_ALIGN_UP(x)	((x + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1))
fyrenmoo@3129: #endif
fyrenmoo@3129: #ifdef PLATFORM_APPLE
fyrenmoo@3129: #include <mach-o/dyld_images.h>
fyrenmoo@3129: #include <mach-o/loader.h>
fyrenmoo@3129: #include <mach-o/nlist.h>
fyrenmoo@3129: #endif
fyrenmoo@3129: 
fyrenmoo@3129: //MemoryUtils g_MemUtils;
fyrenmoo@3129: 
fyrenmoo@3129: MemoryUtils::MemoryUtils()
fyrenmoo@3129: {
fyrenmoo@3129: #ifdef PLATFORM_APPLE
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Get pointer to struct that describes all loaded mach-o images in process */
fyrenmoo@3129: 	struct nlist list[2];
fyrenmoo@3129: 	memset(list, 0, sizeof(list));
fyrenmoo@3129: 	list[0].n_un.n_name = (char *)"_dyld_all_image_infos";
fyrenmoo@3129: 	nlist("/usr/lib/dyld", list);
fyrenmoo@3129: 	m_ImageList = (struct dyld_all_image_infos *)list[0].n_value;
fyrenmoo@3129: 
fyrenmoo@3129: #endif
fyrenmoo@3129: }
fyrenmoo@3129: 
fyrenmoo@3129: MemoryUtils::~MemoryUtils()
fyrenmoo@3129: {
fyrenmoo@3129: #if defined PLATFORM_LINUX || defined PLATFORM_APPLE
fyrenmoo@3129: 	for (size_t i = 0; i < m_SymTables.size(); i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		delete m_SymTables[i];
fyrenmoo@3129: 	}
fyrenmoo@3129: 	m_SymTables.clear();
fyrenmoo@3129: #endif
fyrenmoo@3129: }
fyrenmoo@3129: 
fyrenmoo@3129: /*void MemoryUtils::OnSourceModAllInitialized()
fyrenmoo@3129: {
fyrenmoo@3129: 	sharesys->AddInterface(NULL, this);
fyrenmoo@3129: }*/
fyrenmoo@3129: 
fyrenmoo@3129: void *MemoryUtils::FindPattern(const void *libPtr, const char *pattern, size_t len)
fyrenmoo@3129: {
fyrenmoo@3129: 	DynLibInfo lib;
fyrenmoo@3129: 	bool found;
fyrenmoo@3129: 	char *ptr, *end;
fyrenmoo@3129: 
fyrenmoo@3129: 	memset(&lib, 0, sizeof(DynLibInfo));
fyrenmoo@3129: 
fyrenmoo@3129: 	if (!GetLibraryInfo(libPtr, lib))
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return NULL;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	ptr = reinterpret_cast<char *>(lib.baseAddress);
fyrenmoo@3129: 	end = ptr + lib.memorySize;
fyrenmoo@3129: 
fyrenmoo@3129: 	while (ptr < end)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		found = true;
fyrenmoo@3129: 		for (register size_t i = 0; i < len; i++)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			if (pattern[i] != '\x2A' && pattern[i] != ptr[i])
fyrenmoo@3129: 			{
fyrenmoo@3129: 				found = false;
fyrenmoo@3129: 				break;
fyrenmoo@3129: 			}
fyrenmoo@3129: 		}
fyrenmoo@3129: 
fyrenmoo@3129: 		if (found)
fyrenmoo@3129: 			return ptr;
fyrenmoo@3129: 
fyrenmoo@3129: 		ptr++;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	return NULL;
fyrenmoo@3129: }
fyrenmoo@3129: 
fyrenmoo@3129: void *MemoryUtils::ResolveSymbol(void *handle, const char *symbol)
fyrenmoo@3129: {
fyrenmoo@3129: #ifdef PLATFORM_WINDOWS
fyrenmoo@3129: 
fyrenmoo@3129: 	return GetProcAddress((HMODULE)handle, symbol);
fyrenmoo@3129: 	
fyrenmoo@3129: #elif defined PLATFORM_LINUX
fyrenmoo@3129: 
fyrenmoo@3129: 	struct link_map *dlmap;
fyrenmoo@3129: 	struct stat dlstat;
fyrenmoo@3129: 	int dlfile;
fyrenmoo@3129: 	uintptr_t map_base;
fyrenmoo@3129: 	Elf32_Ehdr *file_hdr;
fyrenmoo@3129: 	Elf32_Shdr *sections, *shstrtab_hdr, *symtab_hdr, *strtab_hdr;
fyrenmoo@3129: 	Elf32_Sym *symtab;
fyrenmoo@3129: 	const char *shstrtab, *strtab;
fyrenmoo@3129: 	uint16_t section_count;
fyrenmoo@3129: 	uint32_t symbol_count;
fyrenmoo@3129: 	LibSymbolTable *libtable;
fyrenmoo@3129: 	SymbolTable *table;
fyrenmoo@3129: 	AddrTable *table2;
fyrenmoo@3129: 	Symbol *symbol_entry;
fyrenmoo@3129: 
fyrenmoo@3129: 	dlmap = (struct link_map *)handle;
fyrenmoo@3129: 	symtab_hdr = NULL;
fyrenmoo@3129: 	strtab_hdr = NULL;
fyrenmoo@3129: 	table = NULL;
fyrenmoo@3129: 	table2 = NULL;
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* See if we already have a symbol table for this library */
fyrenmoo@3129: 	for (size_t i = 0; i < m_SymTables.size(); i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		libtable = m_SymTables[i];
fyrenmoo@3129: 		if (libtable->lib_base == dlmap->l_addr)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			table = &libtable->table;
fyrenmoo@3129: 			table2 = &libtable->table2;
fyrenmoo@3129: 			break;
fyrenmoo@3129: 		}
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* If we don't have a symbol table for this library, then create one */
fyrenmoo@3129: 	if (table == NULL)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		libtable = new LibSymbolTable();
fyrenmoo@3129: 		libtable->table.Initialize();
fyrenmoo@3129: 		libtable->table2.Initialize();
fyrenmoo@3129: 		libtable->lib_base = dlmap->l_addr;
fyrenmoo@3129: 		libtable->last_pos = 0;
fyrenmoo@3129: 		table = &libtable->table;
fyrenmoo@3129: 		table2 = &libtable->table2;
fyrenmoo@3129: 		m_SymTables.push_back(libtable);
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* See if the symbol is already cached in our table */
fyrenmoo@3129: 	symbol_entry = table->FindSymbol(symbol, strlen(symbol));
fyrenmoo@3129: 	if (symbol_entry != NULL)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return symbol_entry->address;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* If symbol isn't in our table, then we have open the actual library */
fyrenmoo@3129: 	dlfile = open(dlmap->l_name, O_RDONLY);
fyrenmoo@3129: 	if (dlfile == -1 || fstat(dlfile, &dlstat) == -1)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		close(dlfile);
fyrenmoo@3129: 		return NULL;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Map library file into memory */
fyrenmoo@3129: 	file_hdr = (Elf32_Ehdr *)mmap(NULL, dlstat.st_size, PROT_READ, MAP_PRIVATE, dlfile, 0);
fyrenmoo@3129: 	map_base = (uintptr_t)file_hdr;
fyrenmoo@3129: 	if (file_hdr == MAP_FAILED)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		close(dlfile);
fyrenmoo@3129: 		return NULL;
fyrenmoo@3129: 	}
fyrenmoo@3129: 	close(dlfile);
fyrenmoo@3129: 
fyrenmoo@3129: 	if (file_hdr->e_shoff == 0 || file_hdr->e_shstrndx == SHN_UNDEF)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		munmap(file_hdr, dlstat.st_size);
fyrenmoo@3129: 		return NULL;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	sections = (Elf32_Shdr *)(map_base + file_hdr->e_shoff);
fyrenmoo@3129: 	section_count = file_hdr->e_shnum;
fyrenmoo@3129: 	/* Get ELF section header string table */
fyrenmoo@3129: 	shstrtab_hdr = &sections[file_hdr->e_shstrndx];
fyrenmoo@3129: 	shstrtab = (const char *)(map_base + shstrtab_hdr->sh_offset);
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Iterate sections while looking for ELF symbol table and string table */
fyrenmoo@3129: 	for (uint16_t i = 0; i < section_count; i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		Elf32_Shdr &hdr = sections[i];
fyrenmoo@3129: 		const char *section_name = shstrtab + hdr.sh_name;
fyrenmoo@3129: 
fyrenmoo@3129: 		if (strcmp(section_name, ".symtab") == 0)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			symtab_hdr = &hdr;
fyrenmoo@3129: 		}
fyrenmoo@3129: 		else if (strcmp(section_name, ".strtab") == 0)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			strtab_hdr = &hdr;
fyrenmoo@3129: 		}
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Uh oh, we don't have a symbol table or a string table */
fyrenmoo@3129: 	if (symtab_hdr == NULL || strtab_hdr == NULL)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		munmap(file_hdr, dlstat.st_size);
fyrenmoo@3129: 		return NULL;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	symtab = (Elf32_Sym *)(map_base + symtab_hdr->sh_offset);
fyrenmoo@3129: 	strtab = (const char *)(map_base + strtab_hdr->sh_offset);
fyrenmoo@3129: 	symbol_count = symtab_hdr->sh_size / symtab_hdr->sh_entsize;
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Iterate symbol table starting from the position we were at last time */
fyrenmoo@3129: 	for (uint32_t i = libtable->last_pos; i < symbol_count; i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		Elf32_Sym &sym = symtab[i];
fyrenmoo@3129: 		unsigned char sym_type = ELF32_ST_TYPE(sym.st_info);
fyrenmoo@3129: 		const char *sym_name = strtab + sym.st_name;
fyrenmoo@3129: 		Symbol *cur_sym;
fyrenmoo@3129: 
fyrenmoo@3129: 		/* Skip symbols that are undefined or do not refer to functions or objects */
fyrenmoo@3129: 		if (sym.st_shndx == SHN_UNDEF || (sym_type != STT_FUNC && sym_type != STT_OBJECT))
fyrenmoo@3129: 		{
fyrenmoo@3129: 			continue;
fyrenmoo@3129: 		}
fyrenmoo@3129: 
fyrenmoo@3129: 		/* Caching symbols as we go along */
fyrenmoo@3129: 		cur_sym = table->InternSymbol(sym_name, strlen(sym_name), (void *)(dlmap->l_addr + sym.st_value));
fyrenmoo@3129: 		table2->InternSymbol(sym_name, strlen(sym_name), (void *)(dlmap->l_addr + sym.st_value));
fyrenmoo@3129: 		if (strcmp(symbol, sym_name) == 0)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			symbol_entry = cur_sym;
fyrenmoo@3129: 			libtable->last_pos = ++i;
fyrenmoo@3129: 	//		break;
fyrenmoo@3129: 		}
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	libtable->last_pos = symbol_count;
fyrenmoo@3129: 
fyrenmoo@3129: 	munmap(file_hdr, dlstat.st_size);
fyrenmoo@3129: 	return symbol_entry ? symbol_entry->address : NULL;
fyrenmoo@3129: 
fyrenmoo@3129: #elif defined PLATFORM_APPLE
fyrenmoo@3129: 	
fyrenmoo@3129: 	uintptr_t dlbase, linkedit_addr;
fyrenmoo@3129: 	uint32_t image_count;
fyrenmoo@3129: 	struct mach_header *file_hdr;
fyrenmoo@3129: 	struct load_command *loadcmds;
fyrenmoo@3129: 	struct segment_command *linkedit_hdr;
fyrenmoo@3129: 	struct symtab_command *symtab_hdr;
fyrenmoo@3129: 	struct nlist *symtab;
fyrenmoo@3129: 	const char *strtab;
fyrenmoo@3129: 	uint32_t loadcmd_count;
fyrenmoo@3129: 	uint32_t symbol_count;
fyrenmoo@3129: 	LibSymbolTable *libtable;
fyrenmoo@3129: 	SymbolTable *table;
fyrenmoo@3129: 	Symbol *symbol_entry;
fyrenmoo@3129: 	
fyrenmoo@3129: 	dlbase = 0;
fyrenmoo@3129: 	image_count = m_ImageList->infoArrayCount;
fyrenmoo@3129: 	linkedit_hdr = NULL;
fyrenmoo@3129: 	symtab_hdr = NULL;
fyrenmoo@3129: 	table = NULL;
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* Loop through mach-o images in process.
fyrenmoo@3129: 	 * We can skip index 0 since that is just the executable.
fyrenmoo@3129: 	 */
fyrenmoo@3129: 	for (uint32_t i = 1; i < image_count; i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		const struct dyld_image_info &info = m_ImageList->infoArray[i];
fyrenmoo@3129: 		
fyrenmoo@3129: 		/* "Load" each one until we get a matching handle */
fyrenmoo@3129: 		void *h = dlopen(info.imageFilePath, RTLD_NOLOAD);
fyrenmoo@3129: 		if (h == handle)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			dlbase = (uintptr_t)info.imageLoadAddress;
fyrenmoo@3129: 			dlclose(h);
fyrenmoo@3129: 			break;
fyrenmoo@3129: 		}
fyrenmoo@3129: 		
fyrenmoo@3129: 		dlclose(h);
fyrenmoo@3129: 	}
fyrenmoo@3129: 	
fyrenmoo@3129: 	if (!dlbase)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		/* Uh oh, we couldn't find a matching handle */
fyrenmoo@3129: 		return NULL;
fyrenmoo@3129: 	}
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* See if we already have a symbol table for this library */
fyrenmoo@3129: 	for (size_t i = 0; i < m_SymTables.size(); i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		libtable = m_SymTables[i];
fyrenmoo@3129: 		if (libtable->lib_base == dlbase)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			table = &libtable->table;
fyrenmoo@3129: 			break;
fyrenmoo@3129: 		}
fyrenmoo@3129: 	}
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* If we don't have a symbol table for this library, then create one */
fyrenmoo@3129: 	if (table == NULL)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		libtable = new LibSymbolTable();
fyrenmoo@3129: 		libtable->table.Initialize();
fyrenmoo@3129: 		libtable->lib_base = dlbase;
fyrenmoo@3129: 		libtable->last_pos = 0;
fyrenmoo@3129: 		table = &libtable->table;
fyrenmoo@3129: 		m_SymTables.push_back(libtable);
fyrenmoo@3129: 	}
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* See if the symbol is already cached in our table */
fyrenmoo@3129: 	symbol_entry = table->FindSymbol(symbol, strlen(symbol));
fyrenmoo@3129: 	if (symbol_entry != NULL)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return symbol_entry->address;
fyrenmoo@3129: 	}
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* If symbol isn't in our table, then we have to locate it in memory */
fyrenmoo@3129: 	
fyrenmoo@3129: 	file_hdr = (struct mach_header *)dlbase;
fyrenmoo@3129: 	loadcmds = (struct load_command *)(dlbase + sizeof(struct mach_header));
fyrenmoo@3129: 	loadcmd_count = file_hdr->ncmds;
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* Loop through load commands until we find the ones for the symbol table */
fyrenmoo@3129: 	for (uint32_t i = 0; i < loadcmd_count; i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		if (loadcmds->cmd == LC_SEGMENT && !linkedit_hdr)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			struct segment_command *seg = (struct segment_command *)loadcmds;
fyrenmoo@3129: 			if (strcmp(seg->segname, "__LINKEDIT") == 0)
fyrenmoo@3129: 			{
fyrenmoo@3129: 				linkedit_hdr = seg;
fyrenmoo@3129: 				if (symtab_hdr)
fyrenmoo@3129: 				{
fyrenmoo@3129: 					break;
fyrenmoo@3129: 				}
fyrenmoo@3129: 			}
fyrenmoo@3129: 		}
fyrenmoo@3129: 		else if (loadcmds->cmd == LC_SYMTAB)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			symtab_hdr = (struct symtab_command *)loadcmds;
fyrenmoo@3129: 			if (linkedit_hdr)
fyrenmoo@3129: 			{
fyrenmoo@3129: 				break;
fyrenmoo@3129: 			}
fyrenmoo@3129: 		}
fyrenmoo@3129: 
fyrenmoo@3129: 		/* Load commands are not of a fixed size which is why we add the size */
fyrenmoo@3129: 		loadcmds = (struct load_command *)((uintptr_t)loadcmds + loadcmds->cmdsize);
fyrenmoo@3129: 	}
fyrenmoo@3129: 	
fyrenmoo@3129: 	if (!linkedit_hdr || !symtab_hdr || !symtab_hdr->symoff || !symtab_hdr->stroff)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		/* Uh oh, no symbol table */
fyrenmoo@3129: 		return NULL;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	linkedit_addr = dlbase + linkedit_hdr->vmaddr;
fyrenmoo@3129: 	symtab = (struct nlist *)(linkedit_addr + symtab_hdr->symoff - linkedit_hdr->fileoff);
fyrenmoo@3129: 	strtab = (const char *)(linkedit_addr + symtab_hdr->stroff - linkedit_hdr->fileoff);
fyrenmoo@3129: 	symbol_count = symtab_hdr->nsyms;
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* Iterate symbol table starting from the position we were at last time */
fyrenmoo@3129: 	for (uint32_t i = libtable->last_pos; i < symbol_count; i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		struct nlist &sym = symtab[i];
fyrenmoo@3129: 		/* Ignore the prepended underscore on all symbols, so +1 here */
fyrenmoo@3129: 		const char *sym_name = strtab + sym.n_un.n_strx + 1;
fyrenmoo@3129: 		Symbol *cur_sym;
fyrenmoo@3129: 		
fyrenmoo@3129: 		/* Skip symbols that are undefined */
fyrenmoo@3129: 		if (sym.n_sect == NO_SECT)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			continue;
fyrenmoo@3129: 		}
fyrenmoo@3129: 		
fyrenmoo@3129: 		/* Caching symbols as we go along */
fyrenmoo@3129: 		cur_sym = table->InternSymbol(sym_name, strlen(sym_name), (void *)(dlbase + sym.n_value));
fyrenmoo@3129: 		if (strcmp(symbol, sym_name) == 0)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			symbol_entry = cur_sym;
fyrenmoo@3129: 			libtable->last_pos = ++i;
fyrenmoo@3129: 			break;
fyrenmoo@3129: 		}
fyrenmoo@3129: 	}
fyrenmoo@3129: 	
fyrenmoo@3129: 	return symbol_entry ? symbol_entry->address : NULL;
fyrenmoo@3129: 
fyrenmoo@3129: #endif
fyrenmoo@3129: }
fyrenmoo@3129: 
fyrenmoo@3129: bool MemoryUtils::GetLibraryInfo(const void *libPtr, DynLibInfo &lib)
fyrenmoo@3129: {
fyrenmoo@3129: 	uintptr_t baseAddr;
fyrenmoo@3129: 
fyrenmoo@3129: 	if (libPtr == NULL)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: #ifdef PLATFORM_WINDOWS
fyrenmoo@3129: 
fyrenmoo@3129: 	MEMORY_BASIC_INFORMATION info;
fyrenmoo@3129: 	IMAGE_DOS_HEADER *dos;
fyrenmoo@3129: 	IMAGE_NT_HEADERS *pe;
fyrenmoo@3129: 	IMAGE_FILE_HEADER *file;
fyrenmoo@3129: 	IMAGE_OPTIONAL_HEADER *opt;
fyrenmoo@3129: 
fyrenmoo@3129: 	if (!VirtualQuery(libPtr, &info, sizeof(MEMORY_BASIC_INFORMATION)))
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	baseAddr = reinterpret_cast<uintptr_t>(info.AllocationBase);
fyrenmoo@3129: 
fyrenmoo@3129: 	/* All this is for our insane sanity checks :o */
fyrenmoo@3129: 	dos = reinterpret_cast<IMAGE_DOS_HEADER *>(baseAddr);
fyrenmoo@3129: 	pe = reinterpret_cast<IMAGE_NT_HEADERS *>(baseAddr + dos->e_lfanew);
fyrenmoo@3129: 	file = &pe->FileHeader;
fyrenmoo@3129: 	opt = &pe->OptionalHeader;
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Check PE magic and signature */
fyrenmoo@3129: 	if (dos->e_magic != IMAGE_DOS_SIGNATURE || pe->Signature != IMAGE_NT_SIGNATURE || opt->Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Check architecture, which is 32-bit/x86 right now
fyrenmoo@3129: 	 * Should change this for 64-bit if Valve gets their act together
fyrenmoo@3129: 	 */
fyrenmoo@3129: 	if (file->Machine != IMAGE_FILE_MACHINE_I386)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* For our purposes, this must be a dynamic library */
fyrenmoo@3129: 	if ((file->Characteristics & IMAGE_FILE_DLL) == 0)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Finally, we can do this */
fyrenmoo@3129: 	lib.memorySize = opt->SizeOfImage;
fyrenmoo@3129: 
fyrenmoo@3129: #elif defined PLATFORM_LINUX
fyrenmoo@3129: 
fyrenmoo@3129: 	Dl_info info;
fyrenmoo@3129: 	Elf32_Ehdr *file;
fyrenmoo@3129: 	Elf32_Phdr *phdr;
fyrenmoo@3129: 	uint16_t phdrCount;
fyrenmoo@3129: 
fyrenmoo@3129: 	if (!dladdr(libPtr, &info))
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	if (!info.dli_fbase || !info.dli_fname)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* This is for our insane sanity checks :o */
fyrenmoo@3129: 	baseAddr = reinterpret_cast<uintptr_t>(info.dli_fbase);
fyrenmoo@3129: 	file = reinterpret_cast<Elf32_Ehdr *>(baseAddr);
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Check ELF magic */
fyrenmoo@3129: 	if (memcmp(ELFMAG, file->e_ident, SELFMAG) != 0)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Check ELF version */
fyrenmoo@3129: 	if (file->e_ident[EI_VERSION] != EV_CURRENT)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Check ELF architecture, which is 32-bit/x86 right now
fyrenmoo@3129: 	 * Should change this for 64-bit if Valve gets their act together
fyrenmoo@3129: 	 */
fyrenmoo@3129: 	if (file->e_ident[EI_CLASS] != ELFCLASS32 || file->e_machine != EM_386 || file->e_ident[EI_DATA] != ELFDATA2LSB)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* For our purposes, this must be a dynamic library/shared object */
fyrenmoo@3129: 	if (file->e_type != ET_DYN)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	phdrCount = file->e_phnum;
fyrenmoo@3129: 	phdr = reinterpret_cast<Elf32_Phdr *>(baseAddr + file->e_phoff);
fyrenmoo@3129: 
fyrenmoo@3129: 	for (uint16_t i = 0; i < phdrCount; i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		Elf32_Phdr &hdr = phdr[i];
fyrenmoo@3129: 
fyrenmoo@3129: 		/* We only really care about the segment with executable code */
fyrenmoo@3129: 		if (hdr.p_type == PT_LOAD && hdr.p_flags == (PF_X|PF_R))
fyrenmoo@3129: 		{
fyrenmoo@3129: 			/* From glibc, elf/dl-load.c:
fyrenmoo@3129: 			 * c->mapend = ((ph->p_vaddr + ph->p_filesz + GLRO(dl_pagesize) - 1) 
fyrenmoo@3129: 			 *             & ~(GLRO(dl_pagesize) - 1));
fyrenmoo@3129: 			 *
fyrenmoo@3129: 			 * In glibc, the segment file size is aligned up to the nearest page size and
fyrenmoo@3129: 			 * added to the virtual address of the segment. We just want the size here.
fyrenmoo@3129: 			 */
fyrenmoo@3129: 			lib.memorySize = PAGE_ALIGN_UP(hdr.p_filesz);
fyrenmoo@3129: 			break;
fyrenmoo@3129: 		}
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: #elif defined PLATFORM_APPLE
fyrenmoo@3129: 
fyrenmoo@3129: 	Dl_info info;
fyrenmoo@3129: 	struct mach_header *file;
fyrenmoo@3129: 	struct segment_command *seg;
fyrenmoo@3129: 	uint32_t cmd_count;
fyrenmoo@3129: 
fyrenmoo@3129: 	if (!dladdr(libPtr, &info))
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	if (!info.dli_fbase || !info.dli_fname)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* This is for our insane sanity checks :o */
fyrenmoo@3129: 	baseAddr = (uintptr_t)info.dli_fbase;
fyrenmoo@3129: 	file = (struct mach_header *)baseAddr;
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Check Mach-O magic */
fyrenmoo@3129: 	if (file->magic != MH_MAGIC)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* Check architecture (32-bit/x86) */
fyrenmoo@3129: 	if (file->cputype != CPU_TYPE_I386 || file->cpusubtype != CPU_SUBTYPE_I386_ALL)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	/* For our purposes, this must be a dynamic library */
fyrenmoo@3129: 	if (file->filetype != MH_DYLIB)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		return false;
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	cmd_count = file->ncmds;
fyrenmoo@3129: 	seg = (struct segment_command *)(baseAddr + sizeof(struct mach_header));
fyrenmoo@3129: 	
fyrenmoo@3129: 	/* Add up memory sizes of mapped segments */
fyrenmoo@3129: 	for (uint32_t i = 0; i < cmd_count; i++)
fyrenmoo@3129: 	{		
fyrenmoo@3129: 		if (seg->cmd == LC_SEGMENT)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			lib.memorySize += seg->vmsize;
fyrenmoo@3129: 		}
fyrenmoo@3129: 		
fyrenmoo@3129: 		seg = (struct segment_command *)((uintptr_t)seg + seg->cmdsize);
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: #endif
fyrenmoo@3129: 
fyrenmoo@3129: 	lib.baseAddress = reinterpret_cast<void *>(baseAddr);
fyrenmoo@3129: 
fyrenmoo@3129: 	return true;
fyrenmoo@3129: }
fyrenmoo@3129: 
fyrenmoo@3129: const char* MemoryUtils::ResolveAddr(void *handle, void* addr)
fyrenmoo@3129: {
fyrenmoo@3129: 	struct link_map *dlmap;
fyrenmoo@3129: 	dlmap = (struct link_map *)handle;
fyrenmoo@3129: 
fyrenmoo@3129: 	LibSymbolTable *libtable;
fyrenmoo@3129: 	AddrTable *table2;
fyrenmoo@3129: 
fyrenmoo@3129: 	for (size_t i = 0; i < m_SymTables.size(); i++)
fyrenmoo@3129: 	{
fyrenmoo@3129: 		libtable = m_SymTables[i];
fyrenmoo@3129: 		if (libtable->lib_base == dlmap->l_addr)
fyrenmoo@3129: 		{
fyrenmoo@3129: 			table2 = &libtable->table2;
fyrenmoo@3129: 			break;
fyrenmoo@3129: 		}
fyrenmoo@3129: 	}
fyrenmoo@3129: 
fyrenmoo@3129: 	if (table2 == NULL) return NULL;
fyrenmoo@3129: 	Symbol *sym = table2->FindAddr(addr);
fyrenmoo@3129: 	return sym ? sym->buffer() : NULL;
fyrenmoo@3129: }