Chameleon

Chameleon Commit Details

Date:2010-08-09 05:12:50 (13 years 8 months ago)
Author:Evan Lojewski
Commit:333
Parents: 332
Message:Initial version of the module system. Basic at the moment, needs a lot of work. Modules (should) be able to link with any function or global variable exported by chameleon. Modules currently *cannot* lonk with each other, if you try to, bad things might happen. Lots fo verbose / debugging information is int modules.c. If you write a module that doesn't load properly, upload a copy of the module, the source, and the issues you are having to the issue tracker and I'll try to fix the bug.
Changes:
A/branches/meklort/i386/boot2/modules.c
A/branches/meklort/i386/boot2/modules.h
M/branches/meklort/i386/boot2/boot.c
M/branches/meklort/i386/libsaio/table.c
M/branches/meklort/i386/modules/Symbols/Makefile
M/branches/meklort/i386/modules/HelloWorld/Makefile
M/branches/meklort/i386/boot2/Makefile

File differences

branches/meklort/i386/libsaio/table.c
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␊
/* 0x8 : boot protected mode 32-bit code segment␊
byte granularity, 1MB limit, MEMBASE offset */␊
{0xFFFF, MEMBASE, 0x00, 0x9E, 0x4F, 0x00}, ␊
␊
//{0xFFFF, MEMBASE, 0x00, 0x9E, 0x4F, 0x00}, ␊
␉{0xFFFF, 0x0000, 0x00, 0x9E, 0xCF, 0x00},␊
␉// TODO: Restore the correct GDT 0x8 entry before exiting the bootloader␊
␊
/* 0x10 : boot protected mode data segment␊
page granularity, 4GB limit, MEMBASE offset */␊
{0xFFFF, MEMBASE, 0x00, 0x92, 0xCF, 0x00},␊
branches/meklort/i386/boot2/Makefile
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# The ordering is important;␊
# boot2.o must be first.␊
OBJS = boot2.o boot.o graphics.o drivers.o prompt.o options.o lzss.o mboot.o \␊
␉ramdisk.o kernel_patcher.o picopng.o resume.o bmdecompress.o graphic_utils.o gui.o␊
␉ramdisk.o picopng.o resume.o bmdecompress.o graphic_utils.o gui.o modules.o kernel_patcher.o␊
# button.o browser.o scrollbar.o == NOTYET␉␊
␊
UTILDIR = ../util␊
branches/meklort/i386/boot2/boot.c
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#include "gui.h"␊
#include "platform.h"␊
#include "resolution.h"␊
#include "modules.h"␊
␊
long gBootMode; /* defaults to 0 == kBootModeNormal */␊
bool gOverrideKernel;␊
// Loading preboot ramdisk if exists.␊
loadPrebootRAMDisk();␊
␊
␉// Intialize module system␊
␉load_module(SYMBOLS_MODULE);␊
␉load_module("HelloWorld");␊
␉␊
// Disable rescan option by default␊
gEnableCDROMRescan = false;␊
␊
branches/meklort/i386/boot2/modules.c
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/*␊
* Copyright 2009 Evan Lojewski. All rights reserved.␊
*␊
*/␊
␊
#include "boot.h"␊
#include "bootstruct.h"␊
#include "multiboot.h"␊
#include "modules.h"␊
␊
␊
unsigned int (*lookup_symbol)(const char*) = NULL;␊
␊
␊
void rebase_macho(void* base, char* rebase_stream, UInt32 size);␊
void bind_macho(void* base, char* bind_stream, UInt32 size);␊
␊
int load_module(const char* module)␊
{␊
␉char modString[128];␊
␉int fh = -1;␊
␉sprintf(modString, "/Extra/modules/%s.dylib", module);␊
␉fh = open(modString, 0);␊
␉if(fh < 0)␊
␉{␊
␉␉printf("Unable to locate module %s\n", modString);␊
␉␉getc();␊
␉␉return ERROR;␊
␉}␊
␉␊
␉unsigned int moduleSize = file_size(fh);␊
␉char* module_base = (char*) malloc(moduleSize);␊
␉if (read(fh, module_base, moduleSize) == moduleSize)␊
␉{␊
␉␉void (*module_start)(void) = NULL;␊
␊
␉␉printf("Module %s read in.\n", modString);␊
␊
␉␉// Module loaded into memory, parse it␊
␉␉module_start = parse_mach(module_base);␊
␊
␉␉if(module_start)␊
␉␉{␊
␉␉␉(*module_start)();␉// Start the module␊
␉␉␉printf("Module started\n");␊
␉␉}␊
␉␉else {␊
␉␉␉printf("Unabel to locate module start\n");␊
␉␉}␊
␊
␉␉␊
␉␉getc();␊
␉␉␊
␉␉// TODO: Add module to loaded list if loaded successfuly␊
␉␉␊
␉}␊
␉else␊
␉{␊
␉␉printf("Unable to read in module %s.dylib\n.", module);␊
␉␉getc();␊
␉}␊
␉return 1;␊
}␊
␊
␊
void* parse_mach(void* binary)␊
{␊
␉int (*module_init)(void) = NULL;␊
␉void (*module_start)(void) = NULL;␊
␊
␊
␉char* moduleName = NULL;␊
␉UInt32 moduleVersion = 0;␊
␉UInt32 moduleCompat = 0;␊
␉␊
␉char* symbolStub = NULL;␊
␉char* nonlazy = NULL;␊
␉char* nonlazy_variables = NULL;␊
␊
␉char* symbolTable = NULL;␊
␉// TODO convert all of the structs a union␊
␉struct load_command *loadCommand;␊
␉struct dylib_command* dylibCommand;␊
␉struct dyld_info_command* dyldInfoCommand;␊
␉struct symtab_command* symtabCommand;␊
␉struct segment_command* segmentCommand;␊
␉struct dysymtab_command* dysymtabCommand;␊
␉struct section* section;␊
␉UInt32 binaryIndex = sizeof(struct mach_header);␊
␉UInt16 cmd = 0;␊
␊
␉// Parse hthrough th eload commands␊
␉if(((struct mach_header*)binary)->magic != MH_MAGIC)␊
␉{␊
␉␉printf("Module is not 32bit\n");␊
␉␉return NULL;␉// 32bit only␊
␉}␊
␉␊
␉if(((struct mach_header*)binary)->filetype != MH_DYLIB)␊
␉{␊
␉␉printf("Module is not a dylib. Unable to load.\n");␊
␉␉return NULL; // Module is in the incorrect format␊
␉}␊
␉␊
␉while(cmd < ((struct mach_header*)binary)->ncmds)␉// TODO: for loop instead␊
␉{␊
␉␉cmd++;␊
␉␉␊
␉␉loadCommand = binary + binaryIndex;␊
␉␉UInt32 cmdSize = loadCommand->cmdsize;␊
␊
␉␉␊
␉␉switch ((loadCommand->cmd & 0x7FFFFFFF))␊
␉␉{␊
␉␉␉case LC_SYMTAB:␊
␉␉␉␉symtabCommand = binary + binaryIndex;␊
␊
␉␉␉␉UInt32 symbolIndex = 0;␊
␉␉␉␉char* symbolString = (UInt32)binary + (char*)symtabCommand->stroff;␊
␉␉␉␉symbolTable = binary + symtabCommand->symoff;␊
␉␉␉␉␊
␉␉␉␉int externalIndex = 0;␊
␉␉␉␉while(symbolIndex < symtabCommand->nsyms)␊
␉␉␉␉{␊
␉␉␉␉␉␊
␉␉␉␉␉struct nlist* symbolEntry = binary + symtabCommand->symoff + (symbolIndex * sizeof(struct nlist));␊
␉␉␉␉␉␊
␉␉␉␉␉// If the symbol is exported by this module␊
␉␉␉␉␉if(symbolEntry->n_value)␊
␉␉␉␉␉{␊
␉␉␉␉␉␉if(strcmp(symbolString + symbolEntry->n_un.n_strx, "_start") == 0)␊
␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉// Module init located. Don't register it, only called once␊
␉␉␉␉␉␉␉module_init = binary + symbolEntry->n_value;␊
␉␉␉␉␉␉}␊
␉␉␉␉␉␉else if(strcmp(symbolString + symbolEntry->n_un.n_strx, "start") == 0)␊
␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉// Module start located. Start is an alias so don't register it␊
␉␉␉␉␉␉␉module_start = binary + symbolEntry->n_value;␊
␉␉␉␉␉␉}␊
␉␉␉␉␉␉else␊
␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉add_symbol(symbolString + symbolEntry->n_un.n_strx, binary + symbolEntry->n_value); ␊
␉␉␉␉␉␉}␊
␉␉␉␉␉}␊
␉␉␉␉␉// External symbol␊
␉␉␉␉␉else if(symbolEntry->n_type & 0x01 && symbolStub)␊
␉␉␉␉␉{␊
␉␉␉␉␉␉printf("Located external symbol %s", symbolString + symbolEntry->n_un.n_strx);␊
␉␉␉␉␉␉printf(" stub at 0x%X, (0x%X)\n", symbolStub + STUB_ENTRY_SIZE * externalIndex - (UInt32)binary, symbolStub + STUB_ENTRY_SIZE * externalIndex);␊
␉␉␉␉␉␉getc();␊
␉␉␉␉␉␉// Patch stub␊
␉␉␉␉␉␉if(lookup_symbol == NULL)␊
␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉printf("Symbol.dylib not loaded. Module loader not setup.\n");␊
␉␉␉␉␉␉␉return NULL;␊
␉␉␉␉␉␉}␊
␉␉␉␉␉␉else␊
␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉void* symbolAddress = (void*)lookup_symbol(symbolString + symbolEntry->n_un.n_strx);␊
␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉if((0xFFFFFFFF == (UInt32)symbolAddress) && ␊
␉␉␉␉␉␉␉ strcmp(symbolString + symbolEntry->n_un.n_strx, SYMBOL_DYLD_STUB_BINDER) != 0)␊
␉␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉␉printf("Unable to locate symbol %s\n", symbolString + symbolEntry->n_un.n_strx);␊
␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉}␊
␉␉␉␉␉␉␉else ␊
␉␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉␉char* patchLocation = symbolStub + STUB_ENTRY_SIZE * externalIndex;␊
␉␉␉␉␉␉␉␉//patch with far jump ;␊
␉␉␉␉␉␉␉␉/*␊
␉␉␉␉␉␉␉␉printf("0x%X 0x%X 0x%X 0x%X 0x%X 0x%X\n", ␊
␉␉␉␉␉␉␉␉␉ patchLocation[0],␊
␉␉␉␉␉␉␉␉␉ patchLocation[1],␊
␉␉␉␉␉␉␉␉␉ patchLocation[2],␊
␉␉␉␉␉␉␉␉␉ patchLocation[3],␊
␉␉␉␉␉␉␉␉␉ patchLocation[4],␊
␉␉␉␉␉␉␉␉␉ patchLocation[5]);␊
␉␉␉␉␉␉␉␉*/␊
␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉␉// Point the symbol stub to the nonlazy pointers␊
␉␉␉␉␉␉␉␉patchLocation[0] = 0xFF;␉// Should already be this␊
␉␉␉␉␉␉␉␉patchLocation[1] = 0x25;␉// Should already be this␊
␉␉␉␉␉␉␉␉patchLocation[2] = ((UInt32)(nonlazy + externalIndex * 4) & 0x000000FF) >> 0;␊
␉␉␉␉␉␉␉␉patchLocation[3] = ((UInt32)(nonlazy + externalIndex * 4) & 0x0000FF00) >> 8;␊
␉␉␉␉␉␉␉␉patchLocation[4] = ((UInt32)(nonlazy + externalIndex * 4) & 0x00FF0000) >> 16;␊
␉␉␉␉␉␉␉␉patchLocation[5] = ((UInt32)(nonlazy + externalIndex * 4) & 0xFF000000) >> 24;␊
␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉␉// Set the nonlazy pointer to the correct address␊
␉␉␉␉␉␉␉␉patchLocation = (nonlazy + externalIndex*4);␊
␉␉␉␉␉␉␉␉patchLocation[0] =((UInt32)symbolAddress & 0x000000FF) >> 0;␊
␉␉␉␉␉␉␉␉patchLocation[1] =((UInt32)symbolAddress & 0x0000FF00) >> 8;␊
␉␉␉␉␉␉␉␉patchLocation[2] =((UInt32)symbolAddress & 0x00FF0000) >> 16;␊
␉␉␉␉␉␉␉␉patchLocation[3] =((UInt32)symbolAddress & 0xFF000000) >> 24;␊
␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉␉externalIndex++;␊
␊
␉␉␉␉␉␉␉}␊
␊
␉␉␉␉␉␉␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉}␊
␉␉␉␉␉␉␉␉␉␉␉ ␊
␉␉␉␉␉}␊
␊
␉␉␉␉␉symbolEntry+= sizeof(struct nlist);␊
␉␉␉␉␉symbolIndex++;␉// TODO remove␊
␉␉␉␉}␊
␉␉␉␉break;␊
␊
␉␉␉case LC_SEGMENT:␊
␉␉␉␉segmentCommand = binary + binaryIndex;␊
␊
␉␉␉␉UInt32 sections = segmentCommand->nsects;␊
␉␉␉␉section = binary + binaryIndex + sizeof(struct segment_command);␊
␉␉␉␉while(sections)␊
␉␉␉␉{␊
␉␉␉␉␉// Look for the __symbol_stub section␊
␉␉␉␉␉if(strcmp(section->sectname, "__nl_symbol_ptr") == 0)␊
␉␉␉␉␉{␊
␉␉␉␉␉␉/*printf("\tSection non lazy pointers at 0x%X, %d symbols\n",␊
␉␉␉␉␉␉␉ section->offset, ␊
␉␉␉␉␉␉␉ section->size / 4);␊
␉␉␉␉␉␉*/␊
␉␉␉␉␉␉switch(section->flags)␊
␉␉␉␉␉␉{␊
␉␉␉␉␉␉␉case S_NON_LAZY_SYMBOL_POINTERS:␊
␉␉␉␉␉␉␉␉nonlazy_variables = binary + section->offset;␊
␉␉␉␉␉␉␉␉␉break;␊
␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉case S_LAZY_SYMBOL_POINTERS:␊
␉␉␉␉␉␉␉␉nonlazy = binary + section->offset;␊
␉␉␉␉␉␉␉␉// Fucntions␊
␉␉␉␉␉␉␉␉break;␊
␉␉␉␉␉␉␉␉␊
␉␉␉␉␉␉␉default:␊
␉␉␉␉␉␉␉␉printf("Unhandled __nl_symbol_ptr section\n");␊
␉␉␉␉␉␉␉␉getc();␊
␉␉␉␉␉␉␉␉break;␊
␉␉␉␉␉␉}␊
␉␉␉␉␉␉//getc();␊
␉␉␉␉␉}␊
␉␉␉␉␉else if(strcmp(section->sectname, "__symbol_stub") == 0)␊
␉␉␉␉␉{␊
␉␉␉␉␉␉/*printf("\tSection __symbol_stub at 0x%X (0x%X), %d symbols\n",␊
␉␉␉␉␉␉␉ section->offset, ␊
␉␉␉␉␉␉␉ section->size / 6);*/␊
␉␉␉␉␉␉symbolStub = binary + section->offset;␊
␉␉␉␉␉␉//getc();␊
␉␉␉␉␉}␊
␊
␉␉␉␉␉␊
␉␉␉␉␉sections--;␊
␉␉␉␉␉section++;␊
␉␉␉␉}␊
␉␉␉␉␉␉ ␊
␉␉␉␉␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case LC_DYSYMTAB:␊
␉␉␉␉dysymtabCommand = binary + binaryIndex;␊
␉␉␉␉//printf("Unhandled loadcommand LC_DYSYMTAB\n");␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case LC_LOAD_DYLIB:␊
␉␉␉␉//printf("Unhandled loadcommand LC_LOAD_DYLIB\n");␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case LC_ID_DYLIB:␊
␉␉␉␉dylibCommand = binary + binaryIndex;␊
␉␉␉␉moduleName =␉binary + binaryIndex + ((UInt32)*((UInt32*)&dylibCommand->dylib.name));␊
␉␉␉␉moduleVersion =␉dylibCommand->dylib.current_version;␊
␉␉␉␉moduleCompat =␉dylibCommand->dylib.compatibility_version;␊
␉␉␉␉break;␊
␊
␉␉␉case LC_DYLD_INFO:␊
␉␉␉␉dyldInfoCommand = binary + binaryIndex;␊
␉␉␉␉/*␊
␉␉␉␉ printf("LC_DYLD_INFO:\n"␊
␉␉␉␉␉ "\tRebase Offset: 0x%X\n"␊
␉␉␉␉␉ "\tBind Offset: 0x%X\n"␊
␉␉␉␉␉ "\tWeak Bind Offset: 0x%X\n"␊
␉␉␉␉␉ "\tLazy Bind Offset: 0x%X\n"␊
␉␉␉␉␉ "\tExport Offset: 0x%X\n",␊
␉␉␉␉␉ dyldInfoCommand->rebase_off,␊
␉␉␉␉␉ dyldInfoCommand->bind_off,␊
␉␉␉␉␉ dyldInfoCommand->weak_bind_off,␊
␉␉␉␉␉ dyldInfoCommand->lazy_bind_off,␊
␉␉␉␉␉ dyldInfoCommand->export_off);␊
␉␉␉␉*/␊
␉␉␉␉if(dyldInfoCommand->bind_off)␊
␉␉␉␉{␊
␉␉␉␉␉bind_macho(binary, (char*)dyldInfoCommand->bind_off, dyldInfoCommand->bind_size);␊
␉␉␉␉}␊
␉␉␉␉␊
␉␉␉␉/*␊
␉␉␉␉ // This is done later on using the __symbol_stub instead␊
␉␉␉␉if(dyldInfoCommand->lazy_bind_off)␊
␉␉␉␉{␊
␉␉␉␉␉bind_macho(binary, (char*)dyldInfoCommand->lazy_bind_off, dyldInfoCommand->lazy_bind_size);␊
␉␉␉␉␉␊
␉␉␉␉}*/␊
␉␉␉␉␊
␉␉␉␉if(dyldInfoCommand->rebase_off)␊
␉␉␉␉{␊
␉␉␉␉␉rebase_macho(binary, (char*)dyldInfoCommand->rebase_off, dyldInfoCommand->rebase_size);␊
␉␉␉␉}␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉break;␊
␊
␉␉␉case LC_UUID:␊
␉␉␉␉// We don't care about the UUID at the moment␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉default:␊
␉␉␉␉printf("Unhandled loadcommand 0x%X\n", loadCommand->cmd & 0x7FFFFFFF);␊
␉␉␉␉break;␊
␉␉␊
␉␉}␊
␊
␉␉binaryIndex += cmdSize;␊
␉}␊
␉if(!moduleName) return NULL;␊
␉␊
␉␊
␉// TODO: Initialize the module.␊
␉printf("Calling _start\n");␊
␉␊
␉getc();␊
␉if(module_init) ␊
␉{␊
␉␉jump_pointer(module_init);␊
␉ }␊
␉module_loaded(moduleName, moduleVersion, moduleCompat);␊
␉getc();␊
␉ //*/␊
␉return module_start; // TODO populate w/ address of _start␊
␉␊
}␊
␊
␊
// This is for debugging, remove the jump_pointer funciton later␊
int jump_pointer(int (*pointer)())␊
{␊
␉printf("Jumping to function at 0x%X\n", pointer);␊
␊
␉getc();␊
␉return (*pointer)();␊
}␊
␊
// Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊
void rebase_macho(void* base, char* rebase_stream, UInt32 size)␊
{␊
␉rebase_stream += (UInt32)base;␊
␉␊
␉UInt8 immediate = 0;␊
␉UInt8 opcode = 0;␊
␉UInt8 type = 0;␊
␉␊
␉UInt32 segmentAddress = 0;␊
␉UInt32 address = 0;␊
␉␊
␉␊
␉␊
␉UInt32 tmp = 0;␊
␉UInt32 tmp2 = 0;␊
␉UInt8 bits = 0;␊
␉int index = 0;␊
␉␊
␉int done = 0;␊
␉unsigned int i = 0;␊
␉␊
␉while(/*!done &&*/ i < size)␊
␉{␊
␉␉immediate = rebase_stream[i] & REBASE_IMMEDIATE_MASK;␊
␉␉opcode = rebase_stream[i] & REBASE_OPCODE_MASK;␊
␊
␉␉␊
␉␉switch(opcode)␊
␉␉{␊
␉␉␉case REBASE_OPCODE_DONE:␊
␉␉␉␉// Rebase complete.␊
␉␉␉␉done = 1;␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_SET_TYPE_IMM:␊
␉␉␉␉// Set rebase type (pointer, absolute32, pcrel32)␊
␉␉␉␉//printf("Rebase type = 0x%X\n", immediate);␊
␉␉␉␉// NOTE: This is currently NOT used␊
␉␉␉␉type = immediate;␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊
␉␉␉␉// Locate address to begin rebasing␊
␉␉␉␉segmentAddress = 0;␊
␊
␉␉␉␉struct segment_command* segCommand = NULL;␊
␉␉␉␉␊
␉␉␉␉unsigned int binIndex = 0;␊
␉␉␉␉index = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊
␉␉␉␉␉␊
␉␉␉␉␉␊
␉␉␉␉␉binIndex += segCommand->cmdsize;␊
␉␉␉␉␉index++;␊
␉␉␉␉}␊
␉␉␉␉while(index <= immediate);␊
␊
␊
␉␉␉␉segmentAddress = segCommand->fileoff;␊
␉␉␉␉␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(rebase_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉segmentAddress += tmp;␊
␉␉␉␉␊
␉␉␉␉//printf("Address = 0x%X\n", segmentAddress);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_ADD_ADDR_ULEB:␊
␉␉␉␉// Add value to rebase address␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp <<= bits;␊
␉␉␉␉␉tmp |= rebase_stream[++i] & 0x7f;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(rebase_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉address +=␉tmp; ␊
␉␉␉␉//printf("Address (add) = 0x%X\n", address);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_ADD_ADDR_IMM_SCALED:␊
␉␉␉␉address += immediate * sizeof(void*);␊
␉␉␉␉//printf("Address (immscaled) = 0x%X\n", address);␊
␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_DO_REBASE_IMM_TIMES:␊
␉␉␉␉//printf("Rebase %d time(s)\n", immediate);␊
␉␉␉␉index = 0;␊
␉␉␉␉for (index = 0; index < immediate; ++index) {␊
␉␉␉␉␉//printf("\tRebasing 0x%X\n", segmentAddress);␊
␉␉␉␉␉␊
␉␉␉␉␉UInt32* addr = base + segmentAddress;␊
␉␉␉␉␉addr[0] += (UInt32)base;␊
␉␉␉␉␉␊
␉␉␉␉␉␊
␉␉␉␉␉segmentAddress += sizeof(void*);␊
␉␉␉␉}␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES:␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(rebase_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉//printf("Rebase %d time(s)\n", tmp);␊
␉␉␉␉␊
␉␉␉␉index = 0;␊
␉␉␉␉for (index = 0; index < tmp; ++index) {␊
␉␉␉␉␉//printf("\tRebasing 0x%X\n", segmentAddress);␊
␉␉␉␉␉␊
␉␉␉␉␉UInt32* addr = base + segmentAddress;␊
␉␉␉␉␉addr[0] += (UInt32)base;␊
␉␉␉␉␉␊
␉␉␉␉␉segmentAddress += sizeof(void*);␊
␉␉␉␉}␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB:␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(rebase_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉//printf("Rebase and add 0x%X\n", tmp);␊
␉␉␉␉//printf("\tRebasing 0x%X\n", segmentAddress);␊
␉␉␉␉UInt32* addr = base + segmentAddress;␊
␉␉␉␉addr[0] += (UInt32)base;␊
␉␉␉␉␊
␉␉␉␉segmentAddress += tmp + sizeof(void*);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB:␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (rebase_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(rebase_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉tmp2 = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp2 |= (rebase_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(rebase_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉//printf("Rebase 0x%X times, skiping 0x%X\n",tmp, tmp2);␊
␉␉␉␉index = 0;␊
␉␉␉␉for (index = 0; index < tmp; ++index) {␊
␉␉␉␉␉//printf("\tRebasing 0x%X\n", segmentAddress);␊
␊
␉␉␉␉␉UInt32* addr = base + segmentAddress;␊
␉␉␉␉␉addr[0] += (UInt32)base;␊
␉␉␉␉␉␊
␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊
␉␉␉␉}␊
␉␉␉␉break;␊
␉␉}␊
␉␉i++;␊
␉}␊
}␊
␊
// Based on code from dylibinfo.cpp and ImageLoaderMachOCompressed.cpp␊
// NOTE: this uses 32bit values, and not 64bit values. ␊
// There is apossibility that this could cause issues,␊
// however the macho file is 32 bit, so it shouldn't matter too much␊
void bind_macho(void* base, char* bind_stream, UInt32 size)␊
{␉␊
␉␊
␉␊
␉bind_stream += (UInt32)base;␊
␉␊
␉UInt8 immediate = 0;␊
␉UInt8 opcode = 0;␊
␉UInt8 type = 0;␊
␉␊
␉UInt32 segmentAddress = 0;␊
␉␊
␉UInt32 address = 0;␊
␉␊
␉SInt32 addend = 0;␊
␉SInt32 libraryOrdinal = 0;␊
␊
␉const char* symbolName = NULL;␊
␉UInt8 symboFlags = 0;␊
␉UInt32 symbolAddr = 0xFFFFFFFF;␊
␉// Temperary variables␊
␉UInt8 bits = 0;␊
␉UInt32 tmp = 0;␊
␉UInt32 tmp2 = 0;␊
␉␊
␉UInt32 index = 0;␊
␉int done = 0;␊
␉unsigned int i = 0;␊
␉␊
␉while(/*!done &&*/ i < size)␊
␉{␊
␉␉immediate = bind_stream[i] & BIND_IMMEDIATE_MASK;␊
␉␉opcode = bind_stream[i] & BIND_OPCODE_MASK;␊
␉␉␊
␉␉␊
␉␉switch(opcode)␊
␉␉{␊
␉␉␉case BIND_OPCODE_DONE:␊
␉␉␉␉done = 1; ␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_IMM:␊
␉␉␉␉libraryOrdinal = immediate;␊
␉␉␉␉//printf("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: %d\n", libraryOrdinal);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB:␊
␉␉␉␉libraryOrdinal = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉libraryOrdinal |= (bind_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(bind_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉//printf("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: %d\n", libraryOrdinal);␊
␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_SET_DYLIB_SPECIAL_IMM:␊
␉␉␉␉// NOTE: this is wrong, fortunately we don't use it␊
␉␉␉␉libraryOrdinal = -immediate;␊
␉␉␉␉//printf("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: %d\n", libraryOrdinal);␊
␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM:␊
␉␉␉␉symboFlags = immediate;␊
␉␉␉␉symbolName = (char*)&bind_stream[++i];␊
␉␉␉␉i += strlen((char*)&bind_stream[i]);␊
␉␉␉␉//printf("BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: %s, 0x%X\n", symbolName, symboFlags);␊
␊
␉␉␉␉symbolAddr = lookup_symbol(symbolName);␊
␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_SET_TYPE_IMM:␊
␉␉␉␉// Set bind type (pointer, absolute32, pcrel32)␊
␉␉␉␉type = immediate;␊
␉␉␉␉//printf("BIND_OPCODE_SET_TYPE_IMM: %d\n", type);␊
␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_SET_ADDEND_SLEB:␊
␉␉␉␉addend = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉addend |= (bind_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(bind_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉if(!(bind_stream[i-1] & 0x40)) addend *= -1;␊
␉␉␉␉␊
␉␉␉␉//printf("BIND_OPCODE_SET_ADDEND_SLEB: %d\n", addend);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB:␊
␉␉␉␉segmentAddress = 0;␊
␊
␉␉␉␉// Locate address␊
␉␉␉␉struct segment_command* segCommand = NULL;␊
␉␉␉␉␊
␉␉␉␉unsigned int binIndex = 0;␊
␉␉␉␉index = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉segCommand = base + sizeof(struct mach_header) + binIndex;␊
␉␉␉␉␉binIndex += segCommand->cmdsize;␊
␉␉␉␉␉index++;␊
␉␉␉␉}␊
␉␉␉␉while(index <= immediate);␊
␉␉␉␉␊
␉␉␉␉segmentAddress = segCommand->fileoff;␊
␉␉␉␉␊
␉␉␉␉// Read in offset␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(bind_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉segmentAddress += tmp;␊
␉␉␉␉␊
␉␉␉␉//printf("BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 0x%X\n", segmentAddress);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_ADD_ADDR_ULEB:␊
␉␉␉␉// Read in offset␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(bind_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉segmentAddress += tmp;␊
␉␉␉␉//printf("BIND_OPCODE_ADD_ADDR_ULEB: 0x%X\n", segmentAddress);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_DO_BIND:␊
␉␉␉␉//printf("BIND_OPCODE_DO_BIND\n");␊
␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊
␉␉␉␉{␊
␉␉␉␉␉address = segmentAddress + (UInt32)base;␊
␉␉␉␉␉␊
␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊
␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊
␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊
␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊
␉␉␉␉}␊
␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊
␉␉␉␉{␊
␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊
␉␉␉␉}␊
␉␉␉␉␊
␉␉␉␉segmentAddress += sizeof(void*);␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB:␊
␉␉␉␉//printf("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB\n");␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉// Read in offset␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(bind_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊
␉␉␉␉{␊
␉␉␉␉␉address = segmentAddress + (UInt32)base;␊
␉␉␉␉␉␊
␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊
␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊
␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊
␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊
␉␉␉␉}␊
␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊
␉␉␉␉{␊
␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊
␉␉␉␉}␊
␉␉␉␉segmentAddress += tmp + sizeof(void*);␊
␊
␉␉␉␉␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED:␊
␉␉␉␉//printf("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED\n");␊
␉␉␉␉␊
␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊
␉␉␉␉{␊
␉␉␉␉␉address = segmentAddress + (UInt32)base;␊
␉␉␉␉␉␊
␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊
␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊
␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊
␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊
␉␉␉␉}␊
␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊
␉␉␉␉{␊
␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊
␉␉␉␉}␊
␉␉␉␉segmentAddress += (immediate * sizeof(void*)) + sizeof(void*);␊
␊
␉␉␉␉␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉␉case BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB:␊
␊
␉␉␉␉tmp = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp |= (bind_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(bind_stream[i] & 0x80);␊
␊
␉␉␉␉␊
␉␉␉␉tmp2 = 0;␊
␉␉␉␉bits = 0;␊
␉␉␉␉do␊
␉␉␉␉{␊
␉␉␉␉␉tmp2 |= (bind_stream[++i] & 0x7f) << bits;␊
␉␉␉␉␉bits += 7;␊
␉␉␉␉}␊
␉␉␉␉while(bind_stream[i] & 0x80);␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉//printf("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0x%X 0x%X\n", tmp, tmp2);␊
␊
␉␉␉␉␊
␉␉␉␉if(symbolAddr != 0xFFFFFFFF)␊
␉␉␉␉{␊
␉␉␉␉␉for(index = 0; index < tmp; index++)␊
␉␉␉␉␉{␊
␉␉␉␉␉␉␊
␉␉␉␉␉␉address = segmentAddress + (UInt32)base;␊
␉␉␉␉␉␉␊
␉␉␉␉␉␉((char*)address)[0] = (symbolAddr & 0x000000FF) >> 0;␊
␉␉␉␉␉␉((char*)address)[1] = (symbolAddr & 0x0000FF00) >> 8;␊
␉␉␉␉␉␉((char*)address)[2] = (symbolAddr & 0x00FF0000) >> 16;␊
␉␉␉␉␉␉((char*)address)[3] = (symbolAddr & 0xFF000000) >> 24;␊
␉␉␉␉␉␉␊
␉␉␉␉␉␉segmentAddress += tmp2 + sizeof(void*);␊
␉␉␉␉␉}␊
␉␉␉␉}␊
␉␉␉␉else if(strcmp(symbolName, SYMBOL_DYLD_STUB_BINDER) != 0)␊
␉␉␉␉{␊
␉␉␉␉␉printf("Unable to bind symbol %s\n", symbolName);␊
␉␉␉␉}␊
␉␉␉␉␊
␉␉␉␉␊
␉␉␉␉break;␊
␉␉␉␉␊
␉␉}␊
␉␉i++;␊
␉}␊
}␊
␊
/*␊
* add_symbol␊
* This function adds a symbol from a module to the list of known symbols ␊
* TODO: actualy do something... ␊
* possibly change to a pointer and add this to the Symbol module␊
*/␊
void add_symbol(const char* symbol, void* addr)␊
{␊
␉printf("Adding symbol %s at 0x%X\n", symbol, addr);␊
␉␊
␉//hack␊
␉if(strcmp(symbol, "_lookup_symbol") == 0)␊
␉{␊
␉␉printf("Initializing lookup symbol function\n");␊
␉␉lookup_symbol = addr;␊
␉}␊
}␊
␊
␊
/*␊
* print out the information about the loaded module␊
* In the future, add to a list of laoded modules␊
* so that if another module depends on it we don't␊
* try to reload the same module.␊
*/␊
void module_loaded(const char* name, UInt32 version, UInt32 compat)␊
{␊
␉printf("\%s.dylib Version %d.%d.%d oaded\n"␊
␉␉ "\tCompatibility Version: %d.%d.%d\n",␊
␉␉ name,␊
␉␉ (version >> 16) & 0xFFFF,␊
␉␉ (version >> 8) & 0x00FF,␊
␉␉ (version >> 0) & 0x00FF,␊
␉␉ (compat >> 16) & 0xFFFF,␊
␉␉ (compat >> 8) & 0x00FF,␊
␉␉ (compat >> 0) & 0x00FF);␉␉␊
␉␊
}␊
branches/meklort/i386/boot2/modules.h
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/*␊
* Module Loading functionality␊
* Copyright 2009 Evan Lojewski. All rights reserved.␊
*␊
*/␊
␊
#include <mach-o/loader.h>␊
#include <mach-o/nlist.h>␊
␊
␊
#ifndef __BOOT_MODULES_H␊
#define __BOOT_MODULES_H␊
␊
#define SYMBOLS_MODULE "Symbols"␊
#define SYMBOL_DYLD_STUB_BINDER␉"dyld_stub_binder"␊
#define STUB_ENTRY_SIZE␉6␊
␊
#define SUCCESS␉1␊
#define␉ERROR␉0␊
␊
␊
␊
int jump_pointer(int (*pointer)());␊
␊
int load_module(const char* module);␊
void module_loaded(const char* name, UInt32 version, UInt32 compat);␊
void add_symbol(const char* symbol, void* addr);␊
void* parse_mach(void* binary);␊
␊
#endif /* __BOOT_MODULES_H */
branches/meklort/i386/modules/Symbols/Makefile
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␉-dylib -read_only_relocs suppress \␊
␉-S -x -dead_strip_dylibs \␊
␉-no_uuid \␊
␉-bind_at_load \␊
␉-current_version $(MODULE_VERSION) -compatibility_version `svn info ../../ | grep Revision | awk '{print $$2}'` \␊
␉-final_output $(MODULE_NAME) \␊
␉$(OBJROOT)/$(MODULE_NAME)Init.o $(OBJROOT)/Symbols.o -o $(SYMROOT)/$(MODULE_NAME).dylib \␊
branches/meklort/i386/modules/HelloWorld/Makefile
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␉-dylib -read_only_relocs suppress \␊
␉-S -x -dead_strip_dylibs \␊
␉-no_uuid \␊
␉-bind_at_load \␊
␉-current_version $(MODULE_VERSION) -compatibility_version $(MODULE_COMPAT_VERSION) \␊
␉-final_output $(MODULE_NAME) \␊
␉$(OBJROOT)/$(MODULE_NAME)Init.o \␊

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