source: trunk/kLdr/kLdr.h@ 2852

/* $Id: kLdr.h 2851 2006-11-02 03:21:54Z bird $ */
/** @file
 *
 * kLdr - The Dynamic Loader.
 *
 * Copyright (c) 2006 knut st. osmundsen <bird@anduin.net>
 *
 *
 * This file is part of kLdr.
 *
 * kLdr 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 2 of the License, or
 * (at your option) any later version.
 *
 * kLdr 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 kLdr; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef __kLdr_h__
#define __kLdr_h__

#ifdef __cplusplus
extern "C" {
#endif

/* kLdr depend on size_t, [u]intNN_t, [u]intptr_t and some related constants. */
#include <sys/types.h>
#include <stddef.h>
#ifdef _MSC_VER
typedef signed char         int8_t;
typedef unsigned char       uint8_t;
typedef signed short        int16_t;
typedef unsigned short      uint16_t;
typedef signed int          int32_t;
typedef unsigned int        uint32_t;
typedef signed __int64      int64_t;
typedef unsigned __int64    uint64_t;
typedef int64_t             intmax_t;
typedef uint64_t            uintmax_t;
#else
# include <stdint.h>
#endif


/** @defgroup grp_kLdrRdr   kLdrRdr - The file provider
 * @{ */

/** The kLdr address type. */
typedef uint64_t KLDRADDR;
/** Pointer to a kLdr address. */
typedef KLDRADDR *PKLDRADDR;
/** Pointer to a const kLdr address. */
typedef const KLDRADDR *PCKLDRADDR;

/** NIL address. */
#define NIL_KLDRADDR    (~(uint64_t)0)

/** The kLdr size type. */
typedef uint64_t KLDRSIZE;
/** Pointer to a kLdr size. */
typedef KLDRSIZE *PKLDRSIZE;
/** Pointer to a const kLdr size. */
typedef const KLDRSIZE *PCKLDRSIZE;



/**
 * Memory Mapping Protections.
 *
 * @remark Shared segments can be mapped using the non copy-on-write variant.
 *         (Normally the copy-on-write variant is used because changes must
 *         be private and not shared with other processes mapping the file.)
 */
typedef enum KLDRPROT
{
    /** The usual invalid 0. */
    KLDRPROT_INVALID = 0,
    /** No access (page not present). */
    KLDRPROT_NOACCESS,
    /** Read only. */
    KLDRPROT_READONLY,
    /** Read & write. */
    KLDRPROT_READWRITE,
    /** Read & copy on write. */
    KLDRPROT_WRITECOPY,
    /** Execute only. */
    KLDRPROT_EXECUTE,
    /** Execute & read. */
    KLDRPROT_EXECUTE_READ,
    /** Execute, read & write. */
    KLDRPROT_EXECUTE_READWRITE,
    /** Execute, read & copy on write. */
    KLDRPROT_EXECUTE_WRITECOPY,
    /** The usual end value. (exclusive) */
    KLDRPROT_END,
    /** Blow the type up to 32-bits. */
    KLDRPROT_32BIT_HACK = 0x7fffffff
} KLDRPROT;


/** Pointer to a file provider instance core. */
typedef struct KLDRRDR *PKLDRRDR;
/** Pointer to a file provider instance core pointer. */
typedef struct KLDRRDR **PPKLDRRDR;

/**
 * File provider instance operations.
 */
typedef struct KLDRRDROPS
{
    /** The name of this file provider. */
    const char *pszName;
    /** Pointer to the next file provider. */
    const struct KLDRRDROPS *pNext;

    /** Try create a new file provider instance.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   ppRdr       Where to store the file provider instance.
     * @param   pszFilename The filename to open.
     */
    int     (* pfnCreate)(  PPKLDRRDR ppRdr, const char *pszFilename);
    /** Destroy the file provider instance.
     *
     * @returns 0 on success, OS specific error code on failure.
     *          On failure, the file provider instance will be in an indeterminate state - don't touch it!
     * @param   pRdr        The file provider instance.
     */
    int     (* pfnDestroy)( PKLDRRDR pRdr);
    /** Read bits from the file.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   pvBuf       Where to put the bits.
     * @param   cb          The number of bytes to read.
     * @param   off         Where to start reading.
     */
    int     (* pfnRead)(    PKLDRRDR pRdr, void *pvBuf, size_t cb, off_t off);
    /** Map all the file bits into memory (read only).
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   ppvBits     Where to store the address of the mapping.
     *                      The size can be obtained using pfnSize.
     */
    int     (* pfnAllMap)(  PKLDRRDR pRdr, const void **ppvBits);
    /** Unmap a file bits mapping obtained by KLDRRDROPS::pfnAllMap.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   pvBits      The mapping address.
     */
    int     (* pfnAllUnmap)(PKLDRRDR pRdr, const void *pvBits);
    /** Get the file size.
     *
     * @returns The file size. Returns -1 on failure.
     * @param   pRdr        The file provider instance.
     */
    off_t   (* pfnSize)(    PKLDRRDR pRdr);
    /** Get the file pointer offset.
     *
     * @returns The file pointer offset. Returns -1 on failure.
     * @param   pRdr        The file provider instance.
     */
    off_t   (* pfnTell)(    PKLDRRDR pRdr);
    /** Get the file name.
     *
     * @returns The file size. Returns -1 on failure.
     * @param   pRdr        The file provider instance.
     */
    const char * (* pfnName)(PKLDRRDR pRdr);
    /**
     * Prepares a memory region to map file sections into.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   ppv         If fFixed is set, *ppv contains the memory location which
     *                      the region should be based at. If fFixed is clear the OS
     *                      is free to choose the location.
     *                      On successful return *ppv contains address of the prepared
     *                      memory region.
     * @param   cb          The size of the memory region to prepare.
     * @param   fFixed      When set *ppv will contain the desired region address.
     *
     */
    int     (* pfnPrepare)(PKLDRRDR pRdr, void **ppv, size_t cb, unsigned fFixed);
    /**
     * Maps a section of the file into the memory region reserved by pfnPrepare.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   pv          The address in the prepared region.
     * @param   cb          The size of the memory mapping.
     * @param   enmProt     The desired memory protection.
     * @param   offFile     The start of the raw file bytes.
     * @param   cbFile      The number of raw file bytes. This must be less or equal to cb.
     */
    int     (* pfnMap)(PKLDRRDR pRdr, void *pv, size_t cb, KLDRPROT enmProt, off_t offFile, size_t cbFile);
    /**
     * Changes the page protection of a section mapped using pfnMap.
     *
     * This is typically used for applying fixups and similar.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   pv          The address passed to pfnMap.
     * @param   cb          The size passed to pfnMap.
     * @param   enmProt     The desired memory protection.
     */
    int     (* pfnProtect)(PKLDRRDR pRdr, void *pv, size_t cb, KLDRPROT enmProt);
    /**
     * Unmaps a section of the file previously mapped using pfnMap.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   pv          The address passed to pfnMap.
     * @param   cb          The size passed to pfnMap.
     */
    int     (* pfnUnmap)(PKLDRRDR pRdr, void *pv, size_t cb);
    /**
     * Releases the memory region prepared by pfnPrepare().
     *
     * Before calling this function, all sections mapped by pfnMap must first be unmapped by calling pfnUnmap.
     *
     * @returns 0 on success, OS specific error code on failure.
     * @param   pRdr        The file provider instance.
     * @param   pv          The address of the prepared region.
     * @param   cb          The size of the prepared region.
     */
    int     (* pfnUnprepare)(PKLDRRDR pRdr, void *pv, size_t cb);
    /**
     * We're done reading from the file but would like to keep file mappings.
     *
     * If the OS support closing the file handle while the file is mapped,
     * the reader should do so.
     *
     * @param   pRdr        The file provider instance.
     */
    void    (* pfnDone)(PKLDRRDR pRdr);
    /** The usual non-zero dummy that makes sure we've initialized all members. */
    uint32_t u32Dummy;
} KLDRRDROPS;
/** Pointer to file provider operations. */
typedef KLDRRDROPS *PKLDRRDROPS;
/** Pointer to const file provider operations. */
typedef const KLDRRDROPS *PCKLDRRDROPS;


/**
 * File provider instance core.
 */
typedef struct KLDRRDR
{
    /** Pointer to the file provider operations. */
    PCKLDRRDROPS pOps;
} KLDRRDR;

void    kLdrRdrAddProvider(PKLDRRDROPS pAdd);

int     kLdrRdrOpen(    PPKLDRRDR ppRdr, const char *pszFilename);
int     kLdrRdrClose(   PKLDRRDR pRdr);
int     kLdrRdrRead(    PKLDRRDR pRdr, void *pvBuf, size_t cb, off_t off);
int     kLdrRdrAllMap(  PKLDRRDR pRdr, const void **ppvBits);
int     kLdrRdrAllUnmap(PKLDRRDR pRdr, const void *pvBits);
off_t   kLdrRdrSize(    PKLDRRDR pRdr);
off_t   kLdrRdrTell(    PKLDRRDR pRdr);
const char *kLdrRdrName(PKLDRRDR pRdr);

/** @} */



/** @defgroup grp_kLdrMod   kLdrMod - The executable image intepreter
 * @{ */


/**
 * Debug info type (from the loader point of view).
 */
typedef enum KLDRDBGINFOTYPE
{
    /** The usual invalid enum value. */
    KLDRDBGINFOTYPE_INVALID = 0,
    /** Stabs. */
    KLDRDBGINFOTYPE_STABS,
    /** Debug With Arbitrary Record Format (DWARF). */
    KLDRDBGINFOTYPE_DWARF,
    /** Microsoft Codeview debug info. */
    KLDRDBGINFOTYPE_CODEVIEW,
    /** Watcom debug info. */
    KLDRDBGINFOTYPE_WATCOM,
    /** IBM High Level Language debug info.. */
    KLDRDBGINFOTYPE_HLL,
    /** The end of the valid debug info values (exclusive). */
    KLDRDBGINFOTYPE_END,
    /** Blow the type up to 32-bit. */
    KLDRDBGINFOTYPE_32BIT_HACK = 0x7fffffff
} KLDRDBGINFOTYPE;
/** Pointer to a kLdr debug info type. */
typedef KLDRDBGINFOTYPE *PKLDRDBGINFOTYPE;


/**
 * Stack information.
 */
typedef struct KLDRSTACKINFO
{
    /** The base address of the stack (sub) segment.
     * Set this to NIL_KLDRADDR if the module doesn't include any stack segment. */
    KLDRADDR        Address;
    /** The base address of the stack (sub) segment, link address.
     * Set this to NIL_KLDRADDR if the module doesn't include any stack (sub)segment. */
    KLDRADDR        LinkAddress;
    /** The stack size of the main thread.
     * If no stack (sub)segment in the module, this is the stack size of the main thread.
     * If the module doesn't contain this kind of information this field will be set to 0. */
    KLDRSIZE        cbStack;
    /** The stack size of non-main threads.
     * If the module doesn't contain this kind of information this field will be set to 0. */
    KLDRSIZE        cbStackThread;
} KLDRSTACKINFO;
/** Pointer to stack information. */
typedef KLDRSTACKINFO *PKLDRSTACKINFO;
/** Pointer to const stack information. */
typedef const KLDRSTACKINFO *PCKLDRSTACKINFO;


/**
 * Loader segment.
 */
typedef struct KLDRSEG
{
    /** Variable free to use for the kLdr user. */
    void           *pvUser;
    /** The segment name. */
    const char     *pszName;
    /** The size of the segment. */
    KLDRSIZE        cb;
    /** The link time load address. */
    KLDRADDR        LinkAddress;
    /** The address the segment was mapped at by kLdrModMap().
     * Set to NIL_KLDRADDR if not mapped. */
    KLDRADDR        MapAddress;
    /** The segment protection. */
    KLDRPROT        enmProt;
} KLDRSEG;
/** Pointer to a loader segment. */
typedef KLDRSEG *PKLDRSEG;
/** Pointer to a loader segment. */
typedef const KLDRSEG *PCKLDRSEG;


/**
 * Loader module format.
 */
typedef enum KLDRFMT
{
    /** The usual invalid 0 format. */
    KLDRFMT_INVALID = 0,
    /** The native OS loader. */
    KLDRFMT_NATIVE,
    /** The AOUT loader. */
    KLDRFMT_AOUT,
    /** The ELF loader. */
    KLDRFMT_ELF,
    /** The LX loader. */
    KLDRFMT_LX,
    /** The mach-o loader. */
    KLDRFMT_MACHO,
    /** The LX loader. */
    KLDRFMT_PE,
    /** The end of the valid format values (exclusive). */
    KLDRFMT_END,
    /** Hack to blow the type up to 32-bit. */
    KLDRFMT_32BIT_HACK = 0x7fffffff
} KLDRFMT;


/**
 * Loader module type.
 */
typedef enum KLDRTYPE
{
    /** The usual invalid 0 type. */
    KLDRTYPE_INVALID = 0,
    /** Object file. */
    KLDRTYPE_OBJECT,
    /** Executable module, fixed load address. */
    KLDRTYPE_EXECUTABLE_FIXED,
    /** Executable module, relocatable, non-fixed load address. */
    KLDRTYPE_EXECUTABLE_RELOCATABLE,
    /** Executable module, position independent code, non-fixed load address. */
    KLDRTYPE_EXECUTABLE_PIC,
    /** Shared library, fixed load address.
     * Typically a system library. */
    KLDRTYPE_SHARED_LIBRARY_FIXED,
    /** Shared library, relocatable, non-fixed load address. */
    KLDRTYPE_SHARED_LIBRARY_RELOCATABLE,
    /** Shared library, position independent code, non-fixed load address. */
    KLDRTYPE_SHARED_LIBRARY_PIC,
    /** DLL that contains no code or data only imports and exports. (Chiefly OS/2.) */
    KLDRTYPE_FORWARDER_DLL,
    /** Core or dump. */
    KLDRTYPE_CORE,
    /** The end of the valid types values (exclusive). */
    KLDRTYPE_END,
    /** Hack to blow the type up to 32-bit. */
    KLDRTYPE_32BIT_HACK = 0x7fffffff
} KLDRTYPE;


/**
 * CPU Architecture.
 * @todo Double check the non intel architectures.
 */
typedef enum KLDRARCH
{
    /** The usual invalid one. */
    KLDRARCH_INVALID = 0,
    /** Clone or Intel 16-bit x86. */
    KLDRARCH_X86_16,
    /** Clone or Intel 32-bit x86. */
    KLDRARCH_X86_32,
    /** AMD64 (including clones). */
    KLDRARCH_AMD64,
    /** Itanic (64-bit). */
    KLDRARCH_IA64,
    /** ALPHA (64-bit). */
    KLDRARCH_ALPHA,
    /** ALPHA limited to 32-bit. */
    KLDRARCH_ALPHA_32,
    /** 32-bit ARM. */
    KLDRARCH_ARM_32,
    /** 64-bit ARM. */
    KLDRARCH_ARM_64,
    /** 32-bit MIPS. */
    KLDRARCH_MIPS_32,
    /** 64-bit MIPS. */
    KLDRARCH_MIPS_64,
    /** 32-bit PowerPC. */
    KLDRARCH_POWERPC_32,
    /** 64-bit PowerPC. */
    KLDRARCH_POWERPC_64,
    /** 32-bit SPARC. */
    KLDRARCH_SPARC_32,
    /** 64-bit SPARC. */
    KLDRARCH_SPARC_64,
    /** The end of the valid architecture values (exclusive). */
    KLDRARCH_END,
    /** Hack to blow the type up to 32-bit. */
    KLDRARCH_32BIT_HACK = 0x7fffffff
} KLDRARCH;


/**
 * CPU models.
 */
typedef enum KLDRCPU
{
    /** The usual invalid cpu. */
    KLDRCPU_INVALID = 0,
    /** @name KLDRARCH_X86_16
     * @{ */
    KLDRCPU_I8086,
    KLDRCPU_I8088,
    KLDRCPU_I80186,
    KLDRCPU_I80286,
    KLDRCPU_I386_16,
    KLDRCPU_I486_16,
    KLDRCPU_I486SX_16,
    KLDRCPU_I586_16,
    KLDRCPU_I686_16,
    KLDRCPU_K6_16,
    KLDRCPU_K7_16,
    KLDRCPU_K8_16,
    /** @} */

    /** @name KLDRARCH_X86_32
     * @{ */
    KLDRCPU_I386,
    KLDRCPU_I486,
    KLDRCPU_I486SX,
    KLDRCPU_I586,
    KLDRCPU_I686,
    KLDRCPU_P4,
    KLDRCPU_CORE2_32,
    KLDRCPU_K6,
    KLDRCPU_K7,
    KLDRCPU_K8_32,
    /** @} */

    /** @name KLDRARCH_AMD64
     * @{ */
    KLDRCPU_K8,
    KLDRCPU_P4_64,
    KLDRCPU_CORE2,
    /** @} */

    /** The end of the valid cpu values (exclusive). */
    KLDRCPU_END,
    /** Hack to blow the type up to 32-bit. */
    KLDRCPU_32BIT_HACK = 0x7fffffff
} KLDRCPU;


/**
 * Loader endian indicator.
 */
typedef enum KLDRENDIAN
{
    /** The usual invalid endian. */
    KLDRENDIAN_INVALID,
    /** Little endian. */
    KLDRENDIAN_LITTLE,
    /** Bit endian. */
    KLDRENDIAN_BIG,
    /** Endianness doesn't have a meaning in the context. */
    KLDRENDIAN_NA,
    /** The end of the valid endian values (exclusive). */
    KLDRENDIAN_END,
    /** Hack to blow the type up to 32-bit. */
    KLDRENDIAN_32BIT_HACK = 0x7fffffff
} KLDRENDIAN;


/** Pointer to a module interpreter method table. */
typedef struct KLDRMODOPS *PKLDRMODOPS;
/** Pointer to const module interpreter methods table. */
typedef const struct KLDRMODOPS *PCKLDRMODOPS;

/**
 * Module interpreter instance.
 * All members are read only unless you're kLdrMod or the module interpreter.
 */
typedef struct KLDRMOD
{
    /** Magic number. */
    uint32_t            u32Magic;
    /** The format of this module. */
    KLDRFMT             enmFmt;
    /** The type of module. */
    KLDRTYPE            enmType;
    /** The architecture this module was built for. */
    KLDRARCH            enmArch;
    /** The minium cpu this module was built for.
     * This might not be accurate, so use kLdrModCanExecuteOn() to check. */
    KLDRARCH            enmCpu;
    /** The endian used by the module. */
    KLDRENDIAN          enmEndian;
    /** The filename length (bytes). */
    uint32_t            cchFilename;
    /** The filename. */
    const char         *pszFilename;
    /** The module name. */
    const char         *pszName;
    /** The module name length (bytes). */
    uint32_t            cchName;
    /** The number of segments in the module. */
    uint32_t            cSegments;
    /** Pointer to the loader methods.
     * Not meant for calling directly thru! */
    PCKLDRMODOPS        pOps;
    /** The module data. */
    void               *pvData;
    /** Segments. (variable size, can be zero) */
    KLDRSEG             aSegments[1];
} KLDRMOD, *PKLDRMOD, **PPKLDRMOD;

/** The magic for KLDRMOD::u32Magic. (Kosuke Fujishima) */
#define KLDRMOD_MAGIC   0x19640707


/** Special base address value alias for the link address. */
#define KLDRMOD_BASEADDRESS_LINK            (~(KLDRADDR)1)
/** Special base address value alias for the actual load address (must be mapped). */
#define KLDRMOD_BASEADDRESS_MAP             (~(KLDRADDR)2)

/** Special import module ordinal value used to indicate that there is no
 * specific module associated with the requested symbol. */
#define NIL_KLDRMOD_IMPORT                 (~(uint32_t)0)

/** Special symbol ordinal value used to indicate that the symbol
 * only has a string name. */
#define NIL_KLDRMOD_SYM_ORDINAL            (~(uint32_t)0)


/** @name Load symbol kind flags.
 * @{ */
/** The bitness doesn't matter. */
#define KLDRSYMKIND_NO_BIT                  0x00000000
/** 16-bit symbol. */
#define KLDRSYMKIND_16BIT                   0x00000001
/** 32-bit symbol. */
#define KLDRSYMKIND_32BIT                   0x00000002
/** 64-bit symbol. */
#define KLDRSYMKIND_64BIT                   0x00000003
/** Mask out the bit.*/
#define KLDRSYMKIND_BIT_MASK                0x00000003
/** We don't know the type of symbol. */
#define KLDRSYMKIND_NO_TYPE                 0x00000000
/** The symbol is a code object (method/function/procedure/whateveryouwannacallit). */
#define KLDRSYMKIND_CODE                    0x00000010
/** The symbol is a data object. */
#define KLDRSYMKIND_DATA                    0x00000020
/** Mask out the symbol type. */
#define KLDRSYMKIND_TYPE_MASK               0x00000030
/** Valid symbol kind mask. */
#define KLDRSYMKIND_MASK                    0x00000033
/** Weak symbol. */
#define KLDRSYMKIND_WEAK                    0x00000100
/** @} */

/** @name kLdrModEnumSymbols flags.
 * @{ */
/** Returns ALL kinds of symbols. The default is to only return public/exported symbols. */
#define KLDRMOD_ENUM_SYMS_FLAGS_ALL         0x00000001
/** @} */


/**
 * Callback for resolving imported symbols when applying fixups.
 *
 * @returns 0 on success and *pValue and *pfKind filled.
 * @returns Non-zero OS specific or kLdr status code on failure.
 *
 * @param   pMod        The module which fixups are begin applied.
 * @param   iImport     The import module ordinal number or NIL_KLDRMOD_IMPORT.
 * @param   uSymbol     The symbol ordinal number or NIL_KLDRMOD_SYM_ORDINAL.
 * @param   pszSymbol   The symbol name. Can be NULL if uSymbol isn't nil.
 * @param   puValue     Where to store the symbol value.
 * @param   pfKind      Where to store the symbol kind flags.
 * @param   pvUser      The user parameter specified to the relocation function.
 */
typedef int FNKLDRMODGETIMPORT(PKLDRMOD pMod, uint32_t iImport, uint32_t uSymbol, const char *pszSymbol,
                               PKLDRADDR puValue, uint32_t *pfKind, void *pvUser);
/** Pointer to a import callback. */
typedef FNKLDRMODGETIMPORT *PFNKLDRMODGETIMPORT;

/**
 * Symbol enumerator callback.
 *
 * @returns 0 if enumeration should continue.
 * @returns non-zero if the enumeration should stop. This status code will then be returned by kLdrModEnumSymbols().
 *
 * @param   pMod        The module which symbols are being enumerated.s
 * @param   uSymbol     The symbol ordinal number or NIL_KLDRMOD_SYM_ORDINAL.
 * @param   pszSymbol   The symbol name. This can be NULL if there is a symbol ordinal.
 *                      This can also be an empty string if the symbol doesn't have a name
 *                      or it's name has been stripped.
 * @param   uValue      The symbol value.
 * @param   fKind       The symbol kind flags.
 * @param   pvUser      The user parameter specified to kLdrModEnumSymbols().
 */
typedef int FNKLDRMODENUMSYMS(PKLDRMOD pMod, uint32_t uSymbol, const char *pszSymbol,
                              KLDRADDR uValue, uint32_t fKind, void *pvUser);
/** Pointer to a symbol enumerator callback. */
typedef FNKLDRMODENUMSYMS *PFNKLDRMODENUMSYMS;

/**
 * Debug info enumerator callback.
 *
 * @returns 0 to continue the enumeration.
 * @returns non-zero if the enumeration should stop. This status code will then be returned by kLdrModEnumDbgInfo().
 *
 * @param   pMod        The module.
 * @param   enmType     The debug info type.
 * @param   iDbgInfo    The debug info ordinal number / id.
 * @param   offFile     The file offset *if* this type has one specific location in the executable image file.
 *                      This is -1 if there isn't any specific file location.
 * @param   cbFile      The file size.
 *                      This is 0 if there isn't any specific file location.
 * @param   pszExtFile  This points to the name of an external file containing the debug info.
 *                      This is NULL if there isn't any external file.
 * @param   pvUser      The user parameter specified to kLdrModEnumDbgInfo.
 */
typedef int FNKLDRENUMDBG(PKLDRMOD pMod, KLDRDBGINFOTYPE enmType, uint32_t iDbgInfo, off_t offFile, off_t cbFile,
                          const char *pszExtFile, void *pvUser);

int     kLdrModOpen(const char *pszFilename, PPKLDRMOD ppMod);
int     kLdrModOpenFromRdr(PKLDRRDR pRdr, PPKLDRMOD ppMod);
int     kLdrModOpenNative(const char *pszFilename, PPKLDRMOD ppMod);
int     kLdrModClose(PKLDRMOD pMod);

int     kLdrModQuerySymbol(PKLDRMOD pMod, const void *pvBits, KLDRADDR BaseAddress, uint32_t uSymbol,
                           const char *pszSymbol, PKLDRADDR puValue, uint32_t *pfKind);
int     kLdrModEnumSymbols(PKLDRMOD pMod, uint32_t fFlags, const void *pvBits, KLDRADDR BaseAddress,
                           PFNKLDRMODENUMSYMS pfnCallback, void *pvUser);
int     kLdrModGetImport(PKLDRMOD pMod, void *pvBits, uint32_t iImport, const char *pszName, size_t cchName);
int32_t kLdrModNumberOfImports(PKLDRMOD pMod, void *pvBits);
int     kLdrModCanExecuteOn(PKLDRMOD pMod, void *pvBits, KLDRARCH enmArch, KLDRCPU enmCpu);
int     kLdrModGetStackInfo(PKLDRMOD pMod, void *pvBits, KLDRADDR BaseAddress, PKLDRSTACKINFO pStackInfo);
int     kLdrModQueryMainEntrypoint(PKLDRMOD pMod, void *pvBits, KLDRADDR BaseAddress, PKLDRADDR pMainEPAddress);
/** Pointer to a debug info enumberator callback. */
typedef FNKLDRENUMDBG *PFNKLDRENUMDBG;
int     kLdrModEnumDbgInfo(PKLDRMOD pMod, void *pvBits, PFNKLDRENUMDBG pfnCallback, void *pvUser);
int     kLdrModHasDbgInfo(PKLDRMOD pMod, void *pvBits);

/** @name Operations On The Internally Managed Mapping
 * @{ */
int     kLdrModMap(PKLDRMOD pMod);
int     kLdrModUnmap(PKLDRMOD pMod);
int     kLdrModAllocTLS(PKLDRMOD pMod);
void    kLdrModFreeTLS(PKLDRMOD pMod);
int     kLdrModReload(PKLDRMOD pMod);
int     kLdrModFixupMapping(PKLDRMOD pMod, PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
int     kLdrModCallInit(PKLDRMOD pMod);
int     kLdrModCallTerm(PKLDRMOD pMod);
int     kLdrModCallThread(PKLDRMOD pMod, unsigned fAttachingOrDetaching);
/** @} */

/** @name Operations On The Externally Managed Mappings
 * @{ */
size_t  kLdrModSize(PKLDRMOD pMod);
int     kLdrModGetBits(PKLDRMOD pMod, void *pvBits, KLDRADDR BaseAddress, PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
int     kLdrModRelocateBits(PKLDRMOD pMod, void *pvBits, KLDRADDR NewBaseAddress, KLDRADDR OldBaseAddress,
                            PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
/** @} */


/**
 * The loader module operation.
 */
typedef struct KLDRMODOPS
{
    /** The name of this module interpreter. */
    const char         *pszName;
    /** Pointer to the next module interpreter. */
    PCKLDRMODOPS        pNext;

    /**
     * Create a loader module instance interpreting the executable image found
     * in the specified file provider instance.
     *
     * @returns 0 on success and *ppMod pointing to a module instance.
     *          On failure, a non-zero OS specific error code is returned.
     * @param   pOps            Pointer to the registered method table.
     * @param   pRdr            The file provider instance to use.
     * @param   offNewHdr       The offset of the new header in MZ files. -1 if not found.
     * @param   ppMod           Where to store the module instance pointer.
     */
    int (* pfnCreate)(PCKLDRMODOPS pOps, PKLDRRDR pRdr, off_t offNewHdr, PPKLDRMOD ppMod);
    /**
     * Destroys an loader module instance.
     *
     * The caller is responsible for calling kLdrModUnmap() and kLdrFreeTLS() first.
     *
     * @returns 0 on success, non-zero on failure. The module instance state
     *          is unknown on failure, it's best not to touch it.
     * @param   pMod    The module.
     */
    int (* pfnDestroy)(PKLDRMOD pMod);

    /** @copydoc kLdrModQuerySymbol */
    int (* pfnQuerySymbol)(PKLDRMOD pMod, const void *pvBits, KLDRADDR BaseAddress, uint32_t uSymbol,
                           const char *pszSymbol, PKLDRADDR puValue, uint32_t *pfKind);
    /** @copydoc kLdrModEnumSymbols */
    int (* pfnEnumSymbols)(PKLDRMOD pMod, uint32_t fFlags, const void *pvBits, KLDRADDR BaseAddress,
                           PFNKLDRMODENUMSYMS pfnCallback, void *pvUser);
    /** @copydoc kLdrModGetImport */
    int (* pfnGetImport)(PKLDRMOD pMod, void *pvBits, uint32_t iImport, const char *pszName, size_t cchName);
    /** @copydoc kLdrModNumberOfImports */
    int32_t (* pfnNumberOfImports)(PKLDRMOD pMod, void *pvBits);
    /** @copydoc kLdrModCanExecuteOn */
    int (* pfnCanExecuteOn)(PKLDRMOD pMod, void *pvBits, KLDRARCH enmArch, KLDRCPU enmCpu);
    /** @copydoc kLdrModGetStackInfo */
    int (* pfnGetStackInfo)(PKLDRMOD pMod, void *pvBits, KLDRADDR BaseAddress, PKLDRSTACKINFO pStackInfo);
    /** @copydoc kLdrModQueryMainEntrypoint */
    int (* pfnQueryMainEntrypoint)(PKLDRMOD pMod, void *pvBits, KLDRADDR BaseAddress, PKLDRADDR pMainEPAddress);
    /** @copydoc kLdrModEnumDbgInfo */
    int (* pfnEnumDbgInfo)(PKLDRMOD pMod, void *pvBits, PFNKLDRENUMDBG pfnCallback, void *pvUser);
    /** @copydoc kLdrModHasDbgInfo */
    int (* pfnHasDbgInfo)(PKLDRMOD pMod, void *pvBits);
    /** @copydoc kLdrModMap */
    int (* pfnMap)(PKLDRMOD pMod);
    /** @copydoc kLdrModUnmap */
    int (* pfnUnmap)(PKLDRMOD pMod);
    /** @copydoc kLdrModAllocTLS */
    int (* pfnAllocTLS)(PKLDRMOD pMod);
    /** @copydoc kLdrModFreeTLS */
    void (* pfnFreeTLS)(PKLDRMOD pMod);
    /** @copydoc kLdrModReload */
    int (* pfnReload)(PKLDRMOD pMod);
    /** @copydoc kLdrModFixupMapping */
    int (* pfnFixupMapping)(PKLDRMOD pMod, PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
    /** @copydoc kLdrModCallInit */
    int (* pfnCallInit)(PKLDRMOD pMod);
    /** @copydoc kLdrModCallTerm */
    int (* pfnCallTerm)(PKLDRMOD pMod);
    /** @copydoc kLdrModCallThread */
    int (* pfnCallThread)(PKLDRMOD pMod, unsigned fAttachingOrDetaching);
    /** @copydoc kLdrModSize */
    size_t (* pfnSize)(PKLDRMOD pMod);
    /** @copydoc kLdrModGetBits */
    int (* pfnGetBits)(PKLDRMOD pMod, void *pvBits, KLDRADDR BaseAddress, PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
    /** @copydoc kLdrModRelocateBits */
    int (* pfnRelocateBits)(PKLDRMOD pMod, void *pvBits, KLDRADDR NewBaseAddress, KLDRADDR OldBaseAddress,
                            PFNKLDRMODGETIMPORT pfnGetImport, void *pvUser);
    /** Dummy which should be assigned a non-zero value. */
    uint32_t uEndOfStructure;
} KLDRMODOPS;


/** @} */




/** @defgroup grp_kLdrDyld   kLdrDyld - The dynamic loader
 * @{ */

/** The handle to a dynamic loader module. */
typedef struct KLDRDYLDMOD *HKLDRMOD;
/** Pointer to the handle to a dynamic loader module. */
typedef HKLDRMOD *PHKLDRMOD;
/** NIL handle value. */
#define NIL_HKLDRMOD    ((HKLDRMOD)0)


/**
 * File search method.
 *
 * In addition to it's own way of finding files, kLdr emulates
 * the methods employed by the most popular systems.
 */
typedef enum KLDRDYLDSEARCH
{
    /** The usual invalid file search method. */
    KLDRDYLD_SEARCH_INVALID = 0,
    /** Uses the kLdr file search method.
     * @todo invent me. */
    KLDRDYLD_SEARCH_KLDR,
    /** Use the emulation closest to the host system. */
    KLDRDYLD_SEARCH_HOST,
    /** Emulate the OS/2 file search method.
     * On non-OS/2 systems, BEGINLIBPATH, LIBPATH, ENDLIBPATH and LIBPATHSTRICT are
     * taken form the environment. */
    KLDRDYLD_SEARCH_OS2,
    /** Emulate the standard window file search method. */
    KLDRDYLD_SEARCH_WINDOWS,
    /** Emulate the alternative window file search method. */
    KLDRDYLD_SEARCH_WINDOWS_ALTERED,
    /** Emulate the most common UNIX file search method. */
    KLDRDYLD_SEARCH_UNIX_COMMON,
    /** End of the valid file search method values. */
    KLDRDYLD_SEARCH_END,
    /** Hack to blow the type up to 32-bit. */
    KLDRDYLD_SEARCH_32BIT_HACK = 0x7fffffff
} KLDRDYLDSEARCH;

/** @name kLdrDyldLoad and kLdrDyldFindByName flags.
 * @{ */
/** The symbols in the module should be loaded into the global unix namespace.
 * If not specified, the symbols are local and can only be referenced directly. */
#define KLDRYDLD_LOAD_FLAGS_GLOBAL_SYMBOLS      0x00000001
/** The module shouldn't be found by a global module search.
 * If not specified, the module can be found by unspecified module searches,
 * typical used when loading import/dep modules. */
#define KLDRYDLD_LOAD_FLAGS_SPECIFIC_MODULE     0x00000002
/** Do a recursive initialization calls instead of defering them to the outermost call. */
#define KLDRDYLD_LOAD_FLAGS_RECURSIVE_INIT      0x00000004
/** We're loading the executable module.
 * Internal flag which will be rejected by kLdrDyldLoad. */
#define KLDRDYLD_LOAD_FLAGS_EXECUTABLE          0x40000000
/** @} */


int     kLdrDyldLoad(const char *pszDll, const char *pszPrefix, const char *pszSuffix, KLDRDYLDSEARCH enmSearch,
                     unsigned fFlags, PHKLDRMOD phMod, char *pszErr, size_t cchErr);
int     kLdrDyldUnload(HKLDRMOD hMod);
int     kLdrDyldFindByName(const char *pszDll, const char *pszPrefix, const char *pszSuffix, KLDRDYLDSEARCH enmSearch,
                           unsigned fFlags, PHKLDRMOD phMod);
int     kLdrDyldFindByAddress(uintptr_t Address, PHKLDRMOD phMod, uint32_t *piSegment, uintptr_t *poffSegment);
int     kLdrDyldGetName(HKLDRMOD hMod, char *pszName, size_t cchName);
int     kLdrDyldGetFilename(HKLDRMOD hMod, char *pszFilename, size_t cchFilename);
int     kLdrDyldQuerySymbol(HKLDRMOD hMod, uint32_t uSymbolOrdinal, const char *pszSymbolName, uintptr_t *pValue, uint32_t *pfKind);

/** @name OS/2 like API
 * @{ */
int     kLdrDosLoadModule(char *pszObject, size_t cbObject, const char *pszModule, PHKLDRMOD phMod);
int     kLdrDosFreeModule(HKLDRMOD hMod);
int     kLdrDosQueryModuleHandle(const char *pszModname, PHKLDRMOD phMod);
int     kLdrDosQueryModuleName(HKLDRMOD hMod, size_t cchName, char *pszName);
int     kLdrDosQueryProcAddr(HKLDRMOD hMod, uint32_t iOrdinal, const char *pszProcName, void **ppvProcAddr);
int     kLdrDosQueryProcType(HKLDRMOD hMod, uint32_t iOrdinal, const char *pszProcName, uint32_t *pfProcType);
int     kLdrDosQueryModFromEIP(PHKLDRMOD phMod, uint32_t *piObject, size_t cbName, char *pszName, uintptr_t *poffObject, uintptr_t ulEIP);
int     kLdrDosReplaceModule(const char *pszOldModule, const char *pszNewModule, const char *pszBackupModule);
int     kLdrDosGetResource(HKLDRMOD hMod, uint32_t idType, uint32_t idName, void **pvResAddr);
int     kLdrDosQueryResourceSize(HKLDRMOD hMod, uint32_t idTypeID, uint32_t idName, uint32_t *pcb);
int     kLdrDosFreeResource(void *pvResAddr);
/** @} */

/** @name POSIX like API
 * @{ */
HKLDRMOD    kLdrDlOpen(const char *pszLibrary, int fFlags);
const char *kLdrDlError(void);
void *      kLdrDlSym(HKLDRMOD hMod, const char *pszSymbol);
int         kLdrDlClose(HKLDRMOD hMod);
/** @} */

/** @name Win32 like API
 * @{ */
HKLDRMOD    kLdrWLoadLibrary(const char *pszFilename);
HKLDRMOD    kLdrWLoadLibraryEx(const char *pszFilename, void *hFileReserved, uint32_t fFlags);
uint32_t    kLdrWGetModuleFileName(HKLDRMOD hMod, char *pszModName, size_t cchModName);
HKLDRMOD    kLdrWGetModuleHandle(const char *pszFilename);
int         kLdrWGetModuleHandleEx(uint32_t fFlags, const char *pszFilename, HKLDRMOD hMod);
void *      kLdrWGetProcAddress(HKLDRMOD hMod, const char *pszProcName);
uint32_t    kLdrWGetDllDirectory(size_t cchDir, char *pszDir);
int         kLdrWSetDllDirectory(const char *pszDir);
int         kLdrWFreeLibrary(HKLDRMOD hMod);
int         kLdrWDisableThreadLibraryCalls(HKLDRMOD hMod);

/** @} */


/** @name Process Bootstrapping
 * @{ */

/**
 * Argument package from the stub.
 */
typedef struct KLDREXEARGS
{
    /** Flags. (Currently unused, MBZ.) */
    uint32_t        fFlags;
    /** The search method to use when loading this executable. */
    KLDRDYLDSEARCH  enmSearch;
    /** The executable file that the stub is supposed to load. */
    char            szExecutable[260];
    /** The default prefix used when searching for DLLs. */
    char            szDefPrefix[16];
    /** The default suffix used when searching for DLLs. */
    char            szDefSuffix[16];
    /** The LD_LIBRARY_PATH prefix for the process.. */
    char            szLibPath[4096 - sizeof(uint32_t) - sizeof(KLDRDYLDSEARCH) - 16 - 16 - 260];
} KLDREXEARGS, *PKLDREXEARGS;

void kLdrLoadExe(PKLDREXEARGS pArgs, void *pvOS);

/** @} */

/** @} */


/** @defgroup grp_kLdrErr   kLdr Status Codes
 * kLdr uses a mix of native status codes and it's own status codes.
 * A status code of 0 means success, all other status codes means failure.
 * @{
 */
#ifdef __OS2__
# define KLDR_ERR_BASE          0x7face000
#elif defined(__WIN__)
# define KLDR_ERR_BASE          0x7face000
#else
# error "port me"
#endif
/** The image format is unknown. */
#define KLDR_ERR_UNKNOWN_FORMAT         (KLDR_ERR_BASE + 0)
/** The MZ image format isn't supported by this kLdr build. */
#define KLDR_ERR_MZ_NOT_SUPPORTED       (KLDR_ERR_BASE + 1)
/** The NE image format isn't supported by this kLdr build. */
#define KLDR_ERR_NE_NOT_SUPPORTED       (KLDR_ERR_BASE + 2)
/** The LX image format isn't supported by this kLdr build. */
#define KLDR_ERR_LX_NOT_SUPPORTED       (KLDR_ERR_BASE + 3)
/** The LE image format isn't supported by this kLdr build. */
#define KLDR_ERR_LE_NOT_SUPPORTED       (KLDR_ERR_BASE + 4)
/** The PE image format isn't supported by this kLdr build. */
#define KLDR_ERR_PE_NOT_SUPPORTED       (KLDR_ERR_BASE + 5)
/** The ELF image format isn't supported by this kLdr build. */
#define KLDR_ERR_ELF_NOT_SUPPORTED      (KLDR_ERR_BASE + 6)
/** The mach-o image format isn't supported by this kLdr build. */
#define KLDR_ERR_MACHO_NOT_SUPPORTED    (KLDR_ERR_BASE + 7)
/** The mach-o image format isn't supported by this kLdr build. */
#define KLDR_ERR_AOUT_NOT_SUPPORTED     (KLDR_ERR_BASE + 8)

/** Invalid parameter to a kLdr API. */
#define KLDR_ERR_INVALID_PARAMETER                          (KLDR_ERR_BASE + 32)
/** Invalid handle parameter to a kLdr API. */
#define KLDR_ERR_INVALID_HANDLE                             (KLDR_ERR_BASE + 33)
/** The module wasn't loaded dynamically. */
#define KLDR_ERR_NOT_LOADED_DYNAMICALLY                     (KLDR_ERR_BASE + 34)
/** The module wasn't found. */
#define KLDR_ERR_MODULE_NOT_FOUND                           (KLDR_ERR_BASE + 35)
/** A prerequisit module wasn't found. */
#define KLDR_ERR_PREREQUISITE_MODULE_NOT_FOUND              (KLDR_ERR_BASE + 36)
/** The module is being terminated and can therefore not be loaded. */
#define KLDR_ERR_MODULE_TERMINATING                         (KLDR_ERR_BASE + 37)
/** A prerequisit module is being terminated and can therefore not be loaded. */
#define KLDR_ERR_PREREQUISITE_MODULE_TERMINATING            (KLDR_ERR_BASE + 38)
/** The module initialization failed. */
#define KLDR_ERR_MODULE_INIT_FAILED                         (KLDR_ERR_BASE + 39)
/** The initialization of a prerequisite module failed. */
#define KLDR_ERR_PREREQUISITE_MODULE_INIT_FAILED            (KLDR_ERR_BASE + 40)
/** The module has already failed initialization and can't be attempted reloaded until
 * after we've finished garbage collection. */
#define KLDR_ERR_MODULE_INIT_FAILED_ALREADY                 (KLDR_ERR_BASE + 41)
/** A prerequisite module has already failed initialization and can't be attempted
 * reloaded until after we've finished garbage collection. */
#define KLDR_ERR_PREREQUISITE_MODULE_INIT_FAILED_ALREADY    (KLDR_ERR_BASE + 42)
/** Prerequisite recursed too deeply. */
#define KLDR_ERR_PREREQUISITE_RECURSED_TOO_DEEPLY           (KLDR_ERR_BASE + 43)
/** Failed to allocate the main stack. */
#define KLDR_ERR_MAIN_STACK_ALLOC_FAILED                    (KLDR_ERR_BASE + 44)
/** Buffer overflow. */
#define KLDR_ERR_BUFFER_OVERFLOW                            (KLDR_ERR_BASE + 45)
/** The specified ARCH+CPU isn't compatible with image. */
#define KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE                    (KLDR_ERR_BASE + 45)
/** Symbol not found. */
#define KLDR_ERR_SYMBOL_NOT_FOUND                           (KLDR_ERR_BASE + 46)

/** Encountered a bad fixup. */
#define KLDR_ERR_BAD_FIXUP                                  (KLDR_ERR_BASE + 48)

/** A memory allocation failed. */
#define KLDR_ERR_NO_MEMORY                                  (KLDR_ERR_BASE + 64)

/** @} */


#ifdef __cplusplus
}
#endif

#endif