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Re: [Gcl-devel] Re: ACL2 Version 4.0
From: |
Matt Kaufmann |
Subject: |
Re: [Gcl-devel] Re: ACL2 Version 4.0 |
Date: |
Tue, 27 Jul 2010 09:06:12 -0500 |
Hi, Camm --
I've attached a log showing those files (on my Intel-based Mac running
Mac OS 10.6.4).
-- Matt
Cc: Matt Kaufmann <address@hidden>, address@hidden
From: Camm Maguire <address@hidden>
Date: Tue, 27 Jul 2010 10:00:52 -0400
X-SpamAssassin-Status: No, hits=-0.4 required=5.0
X-UTCS-Spam-Status: No, hits=-189 required=165
Thank you so much! But after reviewing the below, it appears I now
need:
/usr/include/mach-o/nlist.h
/usr/include/nlist.h
Take care,
"George W. Dinolt" <address@hidden> writes:
> Camm:
> I have been a lurker on the list for several years. Time for a small
> contribution.
>
> I tried the same test as Matt on a Snow Leopard MAC and got the same
> result. I also have access to a Mac running Leopard. I was able to
> compile gcl on that (after making sure that tcl/tk was not in the
> path). I checked the differences between Leopard and Snow Leopard with
> the files you suggested we look at, they are in /usr/include.
>
> The one that is different in Snow Leopard is "loader.h". It is
> included below.
>
> Unfortunately, I am unable to make a machine available to you. My
> machines are relatively hidden behind U.S. gov't firewalls.
>
> I hope this will be of some help.
>
> Regards,
> George Dinolt
> ----------------------------------------
> loader.h from Snow Leopard
> ----------------------------------------
> /*
> * Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
> *
> * @APPLE_LICENSE_HEADER_START@
> *
> * This file contains Original Code and/or Modifications of Original Code
> * as defined in and that are subject to the Apple Public Source License
> * Version 2.0 (the 'License'). You may not use this file except in
> * compliance with the License. Please obtain a copy of the License at
> * http://www.opensource.apple.com/apsl/ and read it before using this
> * file.
> *
> * The Original Code and all software distributed under the License are
> * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
> * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
> * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
> * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
> * Please see the License for the specific language governing rights and
> * limitations under the License.
> *
> * @APPLE_LICENSE_HEADER_END@
> */
> #ifndef _MACHO_LOADER_H_
> #define _MACHO_LOADER_H_
>
> /*
> * This file describes the format of mach object files.
> */
> #include <stdint.h>
>
> /*
> * <mach/machine.h> is needed here for the cpu_type_t and
> cpu_subtype_t types
> * and contains the constants for the possible values of these types.
> */
> #include <mach/machine.h>
>
> /*
> * <mach/vm_prot.h> is needed here for the vm_prot_t type and contains the
> * constants that are or'ed together for the possible values of this type.
> */
> #include <mach/vm_prot.h>
>
> /*
> * <machine/thread_status.h> is expected to define the flavors of the
> thread
> * states and the structures of those flavors for each machine.
> */
> #include <mach/machine/thread_status.h>
> #include <architecture/byte_order.h>
>
> /*
> * The 32-bit mach header appears at the very beginning of the object
> file for
> * 32-bit architectures.
> */
> struct mach_header {
> uint32_t magic; /* mach magic number identifier */
> cpu_type_t cputype; /* cpu specifier */
> cpu_subtype_t cpusubtype; /* machine specifier */
> uint32_t filetype; /* type of file */
> uint32_t ncmds; /* number of load commands */
> uint32_t sizeofcmds; /* the size of all the load commands */
> uint32_t flags; /* flags */
> };
>
> /* Constant for the magic field of the mach_header (32-bit architectures)
*/
> #define MH_MAGIC 0xfeedface /* the mach magic number */
> #define MH_CIGAM 0xcefaedfe /* NXSwapInt(MH_MAGIC) */
>
> /*
> * The 64-bit mach header appears at the very beginning of object files for
> * 64-bit architectures.
> */
> struct mach_header_64 {
> uint32_t magic; /* mach magic number identifier */
> cpu_type_t cputype; /* cpu specifier */
> cpu_subtype_t cpusubtype; /* machine specifier */
> uint32_t filetype; /* type of file */
> uint32_t ncmds; /* number of load commands */
> uint32_t sizeofcmds; /* the size of all the load commands */
> uint32_t flags; /* flags */
> uint32_t reserved; /* reserved */
> };
>
> /* Constant for the magic field of the mach_header_64 (64-bit
> architectures) */
> #define MH_MAGIC_64 0xfeedfacf /* the 64-bit mach magic number */
> #define MH_CIGAM_64 0xcffaedfe /* NXSwapInt(MH_MAGIC_64) */
>
> /*
> * The layout of the file depends on the filetype. For all but the
> MH_OBJECT
> * file type the segments are padded out and aligned on a segment alignment
> * boundary for efficient demand pageing. The MH_EXECUTE, MH_FVMLIB,
> MH_DYLIB,
> * MH_DYLINKER and MH_BUNDLE file types also have the headers included
> as part
> * of their first segment.
> *
> * The file type MH_OBJECT is a compact format intended as output of the
> * assembler and input (and possibly output) of the link editor (the .o
> * format). All sections are in one unnamed segment with no segment
> padding.
> * This format is used as an executable format when the file is so
> small the
> * segment padding greatly increases its size.
> *
> * The file type MH_PRELOAD is an executable format intended for
> things that
> * are not executed under the kernel (proms, stand alones, kernels,
> etc). The
> * format can be executed under the kernel but may demand paged it and not
> * preload it before execution.
> *
> * A core file is in MH_CORE format and can be any in an arbritray legal
> * Mach-O file.
> *
> * Constants for the filetype field of the mach_header
> */
> #define MH_OBJECT 0x1 /* relocatable object file */
> #define MH_EXECUTE 0x2 /* demand paged executable file */
> #define MH_FVMLIB 0x3 /* fixed VM shared library file */
> #define MH_CORE 0x4 /* core file */
> #define MH_PRELOAD 0x5 /* preloaded executable file */
> #define MH_DYLIB 0x6 /* dynamically bound shared library */
> #define MH_DYLINKER 0x7 /* dynamic link editor */
> #define MH_BUNDLE 0x8 /* dynamically bound bundle file */
> #define MH_DYLIB_STUB 0x9 /* shared library stub for static */
> /* linking only, no section contents */
> #define MH_DSYM 0xa /* companion file with only debug */
> /* sections */
> #define MH_KEXT_BUNDLE 0xb /* x86_64 kexts */
>
> /* Constants for the flags field of the mach_header */
> #define MH_NOUNDEFS 0x1 /* the object file has no undefined
> references */
> #define MH_INCRLINK 0x2 /* the object file is the output of an
> incremental link against a base file
> and can't be link edited again */
> #define MH_DYLDLINK 0x4 /* the object file is input for the
> dynamic linker and can't be staticly
> link edited again */
> #define MH_BINDATLOAD 0x8 /* the object file's undefined
> references are bound by the dynamic
> linker when loaded. */
> #define MH_PREBOUND 0x10 /* the file has its dynamic undefined
> references prebound. */
> #define MH_SPLIT_SEGS 0x20 /* the file has its read-only and
> read-write segments split */
> #define MH_LAZY_INIT 0x40 /* the shared library init routine is
> to be run lazily via catching memory
> faults to its writeable segments
> (obsolete) */
> #define MH_TWOLEVEL 0x80 /* the image is using two-level name
> space bindings */
> #define MH_FORCE_FLAT 0x100 /* the executable is forcing all
> images
> to use flat name space bindings */
> #define MH_NOMULTIDEFS 0x200 /* this umbrella guarantees no
> multiple
> defintions of symbols in its
> sub-images so the two-level namespace
> hints can always be used. */
> #define MH_NOFIXPREBINDING 0x400 /* do not have dyld notify the
> prebinding agent about this
> executable */
> #define MH_PREBINDABLE 0x800 /* the binary is not prebound
> but can
> have its prebinding redone. only used
> when MH_PREBOUND is not set. */
> #define MH_ALLMODSBOUND 0x1000 /* indicates that this binary binds
to
> all two-level namespace
> modules of
> its dependent libraries. only used
> when MH_PREBINDABLE and MH_TWOLEVEL
> are both set. */
> #define MH_SUBSECTIONS_VIA_SYMBOLS 0x2000/* safe to divide up the
> sections into
> sub-sections via symbols for dead
> code stripping */
> #define MH_CANONICAL 0x4000 /* the binary has been canonicalized
> via the unprebind operation */
> #define MH_WEAK_DEFINES 0x8000 /* the final linked image contains
> external weak symbols */
> #define MH_BINDS_TO_WEAK 0x10000 /* the final linked image uses
> weak symbols */
>
> #define MH_ALLOW_STACK_EXECUTION 0x20000/* When this bit is set, all stacks
> in the task will be given stack
> execution privilege. Only used in
> MH_EXECUTE filetypes. */
> #define MH_DEAD_STRIPPABLE_DYLIB 0x400000 /* Only for use on
> dylibs. When
> linking against a dylib that
> has this bit set, the static linker
> will automatically not create a
> LC_LOAD_DYLIB load command to the
> dylib if no symbols are being
> referenced from the dylib. */
> #define MH_ROOT_SAFE 0x40000 /* When this bit is set, the binary
> declares it is safe for use in
> processes with uid zero */
>
> #define MH_SETUID_SAFE 0x80000 /* When this bit is set, the binary
> declares it is safe for use in
> processes when issetugid() is true */
>
> #define MH_NO_REEXPORTED_DYLIBS 0x100000 /* When this bit is set on a
> dylib,
> the static linker does not need to
> examine dependent dylibs to see
> if any are re-exported */
> #define MH_PIE 0x200000 /* When this bit is set, the OS will
> load the main executable at a
> random address. Only used in
> MH_EXECUTE filetypes. */
>
> /*
> * The load commands directly follow the mach_header. The total size
> of all
> * of the commands is given by the sizeofcmds field in the
> mach_header. All
> * load commands must have as their first two fields cmd and cmdsize.
> The cmd
> * field is filled in with a constant for that command type. Each
> command type
> * has a structure specifically for it. The cmdsize field is the size
> in bytes
> * of the particular load command structure plus anything that follows
> it that
> * is a part of the load command (i.e. section structures, strings,
> etc.). To
> * advance to the next load command the cmdsize can be added to the
> offset or
> * pointer of the current load command. The cmdsize for 32-bit
> architectures
> * MUST be a multiple of 4 bytes and for 64-bit architectures MUST be
> a multiple
> * of 8 bytes (these are forever the maximum alignment of any load
> commands).
> * The padded bytes must be zero. All tables in the object file must also
> * follow these rules so the file can be memory mapped. Otherwise the
> pointers
> * to these tables will not work well or at all on some machines. With all
> * padding zeroed like objects will compare byte for byte.
> */
> struct load_command {
> uint32_t cmd; /* type of load command */
> uint32_t cmdsize; /* total size of command in bytes */
> };
>
> /*
> * After MacOS X 10.1 when a new load command is added that is
> required to be
> * understood by the dynamic linker for the image to execute properly the
> * LC_REQ_DYLD bit will be or'ed into the load command constant. If
> the dynamic
> * linker sees such a load command it it does not understand will issue a
> * "unknown load command required for execution" error and refuse to
> use the
> * image. Other load commands without this bit that are not
> understood will
> * simply be ignored.
> */
> #define LC_REQ_DYLD 0x80000000
>
> /* Constants for the cmd field of all load commands, the type */
> #define LC_SEGMENT 0x1 /* segment of this file to be mapped */
> #define LC_SYMTAB 0x2 /* link-edit stab symbol table info */
> #define LC_SYMSEG 0x3 /* link-edit gdb symbol table info
> (obsolete) */
> #define LC_THREAD 0x4 /* thread */
> #define LC_UNIXTHREAD 0x5 /* unix thread (includes a stack) */
> #define LC_LOADFVMLIB 0x6 /* load a specified fixed VM shared
> library */
> #define LC_IDFVMLIB 0x7 /* fixed VM shared library
> identification */
> #define LC_IDENT 0x8 /* object identification info (obsolete) */
> #define LC_FVMFILE 0x9 /* fixed VM file inclusion (internal use) */
> #define LC_PREPAGE 0xa /* prepage command (internal use) */
> #define LC_DYSYMTAB 0xb /* dynamic link-edit symbol table info */
> #define LC_LOAD_DYLIB 0xc /* load a dynamically linked shared
> library */
> #define LC_ID_DYLIB 0xd /* dynamically linked shared lib ident */
> #define LC_LOAD_DYLINKER 0xe /* load a dynamic linker */
> #define LC_ID_DYLINKER 0xf /* dynamic linker identification */
> #define LC_PREBOUND_DYLIB 0x10 /* modules prebound for a
> dynamically */
> /* linked shared library */
> #define LC_ROUTINES 0x11 /* image routines */
> #define LC_SUB_FRAMEWORK 0x12 /* sub framework */
> #define LC_SUB_UMBRELLA 0x13 /* sub umbrella */
> #define LC_SUB_CLIENT 0x14 /* sub client */
> #define LC_SUB_LIBRARY 0x15 /* sub library */
> #define LC_TWOLEVEL_HINTS 0x16 /* two-level namespace lookup hints */
> #define LC_PREBIND_CKSUM 0x17 /* prebind checksum */
>
> /*
> * load a dynamically linked shared library that is allowed to be missing
> * (all symbols are weak imported).
> */
> #define LC_LOAD_WEAK_DYLIB (0x18 | LC_REQ_DYLD)
>
> #define LC_SEGMENT_64 0x19 /* 64-bit segment of this file to be
> mapped */
> #define LC_ROUTINES_64 0x1a /* 64-bit image routines */
> #define LC_UUID 0x1b /* the uuid */
> #define LC_RPATH (0x1c | LC_REQ_DYLD) /* runpath additions */
> #define LC_CODE_SIGNATURE 0x1d /* local of code signature */
> #define LC_SEGMENT_SPLIT_INFO 0x1e /* local of info to split segments */
> #define LC_REEXPORT_DYLIB (0x1f | LC_REQ_DYLD) /* load and re-export
> dylib */
> #define LC_LAZY_LOAD_DYLIB 0x20 /* delay load of dylib until
> first use */
> #define LC_ENCRYPTION_INFO 0x21 /* encrypted segment information */
> #define LC_DYLD_INFO 0x22 /* compressed dyld information */
> #define LC_DYLD_INFO_ONLY (0x22|LC_REQ_DYLD) /* compressed dyld
> information only */
>
> /*
> * A variable length string in a load command is represented by an lc_str
> * union. The strings are stored just after the load command structure and
> * the offset is from the start of the load command structure. The size
> * of the string is reflected in the cmdsize field of the load command.
> * Once again any padded bytes to bring the cmdsize field to a multiple
> * of 4 bytes must be zero.
> */
> union lc_str {
> uint32_t offset; /* offset to the string */
> #ifndef __LP64__
> char *ptr; /* pointer to the string */
> #endif
> };
>
> /*
> * The segment load command indicates that a part of this file is to be
> * mapped into the task's address space. The size of this segment in
> memory,
> * vmsize, maybe equal to or larger than the amount to map from this file,
> * filesize. The file is mapped starting at fileoff to the beginning of
> * the segment in memory, vmaddr. The rest of the memory of the segment,
> * if any, is allocated zero fill on demand. The segment's maximum virtual
> * memory protection and initial virtual memory protection are specified
> * by the maxprot and initprot fields. If the segment has sections
> then the
> * section structures directly follow the segment command and their size is
> * reflected in cmdsize.
> */
> struct segment_command { /* for 32-bit architectures */
> uint32_t cmd; /* LC_SEGMENT */
> uint32_t cmdsize; /* includes sizeof section structs */
> char segname[16]; /* segment name */
> uint32_t vmaddr; /* memory address of this segment */
> uint32_t vmsize; /* memory size of this segment */
> uint32_t fileoff; /* file offset of this segment */
> uint32_t filesize; /* amount to map from the file */
> vm_prot_t maxprot; /* maximum VM protection */
> vm_prot_t initprot; /* initial VM protection */
> uint32_t nsects; /* number of sections in segment */
> uint32_t flags; /* flags */
> };
>
> /*
> * The 64-bit segment load command indicates that a part of this file
> is to be
> * mapped into a 64-bit task's address space. If the 64-bit segment has
> * sections then section_64 structures directly follow the 64-bit segment
> * command and their size is reflected in cmdsize.
> */
> struct segment_command_64 { /* for 64-bit architectures */
> uint32_t cmd; /* LC_SEGMENT_64 */
> uint32_t cmdsize; /* includes sizeof section_64 structs */
> char segname[16]; /* segment name */
> uint64_t vmaddr; /* memory address of this segment */
> uint64_t vmsize; /* memory size of this segment */
> uint64_t fileoff; /* file offset of this segment */
> uint64_t filesize; /* amount to map from the file */
> vm_prot_t maxprot; /* maximum VM protection */
> vm_prot_t initprot; /* initial VM protection */
> uint32_t nsects; /* number of sections in segment */
> uint32_t flags; /* flags */
> };
>
> /* Constants for the flags field of the segment_command */
> #define SG_HIGHVM 0x1 /* the file contents for this segment is for
> the high part of the VM space, the low part
> is zero filled (for stacks in core files) */
> #define SG_FVMLIB 0x2 /* this segment is the VM that is
> allocated by
> a fixed VM library, for overlap checking in
> the link editor */
> #define SG_NORELOC 0x4 /* this segment has nothing that was
> relocated
> in it and nothing relocated to it, that is
> it maybe safely replaced without relocation*/
> #define SG_PROTECTED_VERSION_1 0x8 /* This segment is protected. If the
> segment starts at file offset 0, the
> first page of the segment is not
> protected. All other pages of the
> segment are protected. */
>
> /*
> * A segment is made up of zero or more sections. Non-MH_OBJECT files have
> * all of their segments with the proper sections in each, and padded
> to the
> * specified segment alignment when produced by the link editor. The first
> * segment of a MH_EXECUTE and MH_FVMLIB format file contains the
> mach_header
> * and load commands of the object file before its first section. The zero
> * fill sections are always last in their segment (in all formats). This
> * allows the zeroed segment padding to be mapped into memory where
> zero fill
> * sections might be. The gigabyte zero fill sections, those with the
> section
> * type S_GB_ZEROFILL, can only be in a segment with sections of this type.
> * These segments are then placed after all other segments.
> *
> * The MH_OBJECT format has all of its sections in one segment for
> * compactness. There is no padding to a specified segment boundary
> and the
> * mach_header and load commands are not part of the segment.
> *
> * Sections with the same section name, sectname, going into the same
> segment,
> * segname, are combined by the link editor. The resulting section is
> aligned
> * to the maximum alignment of the combined sections and is the new
> section's
> * alignment. The combined sections are aligned to their original
> alignment in
> * the combined section. Any padded bytes to get the specified
> alignment are
> * zeroed.
> *
> * The format of the relocation entries referenced by the reloff and nreloc
> * fields of the section structure for mach object files is described
> in the
> * header file <reloc.h>.
> */
> struct section { /* for 32-bit architectures */
> char sectname[16]; /* name of this section */
> char segname[16]; /* segment this section goes in */
> uint32_t addr; /* memory address of this section */
> uint32_t size; /* size in bytes of this section */
> uint32_t offset; /* file offset of this section */
> uint32_t align; /* section alignment (power of 2) */
> uint32_t reloff; /* file offset of relocation entries */
> uint32_t nreloc; /* number of relocation entries */
> uint32_t flags; /* flags (section type and attributes)*/
> uint32_t reserved1; /* reserved (for offset or index) */
> uint32_t reserved2; /* reserved (for count or sizeof) */
> };
>
> struct section_64 { /* for 64-bit architectures */
> char sectname[16]; /* name of this section */
> char segname[16]; /* segment this section goes in */
> uint64_t addr; /* memory address of this section */
> uint64_t size; /* size in bytes of this section */
> uint32_t offset; /* file offset of this section */
> uint32_t align; /* section alignment (power of 2) */
> uint32_t reloff; /* file offset of relocation entries */
> uint32_t nreloc; /* number of relocation entries */
> uint32_t flags; /* flags (section type and attributes)*/
> uint32_t reserved1; /* reserved (for offset or index) */
> uint32_t reserved2; /* reserved (for count or sizeof) */
> uint32_t reserved3; /* reserved */
> };
>
> /*
> * The flags field of a section structure is separated into two parts
> a section
> * type and section attributes. The section types are mutually
> exclusive (it
> * can only have one type) but the section attributes are not (it may
> have more
> * than one attribute).
> */
> #define SECTION_TYPE 0x000000ff /* 256 section types */
> #define SECTION_ATTRIBUTES 0xffffff00 /* 24 section attributes */
>
> /* Constants for the type of a section */
> #define S_REGULAR 0x0 /* regular section */
> #define S_ZEROFILL 0x1 /* zero fill on demand section */
> #define S_CSTRING_LITERALS 0x2 /* section with only literal C
> strings*/
> #define S_4BYTE_LITERALS 0x3 /* section with only 4 byte
> literals */
> #define S_8BYTE_LITERALS 0x4 /* section with only 8 byte
> literals */
> #define S_LITERAL_POINTERS 0x5 /* section with only pointers to */
> /* literals */
> /*
> * For the two types of symbol pointers sections and the symbol stubs
> section
> * they have indirect symbol table entries. For each of the entries in the
> * section the indirect symbol table entries, in corresponding order in the
> * indirect symbol table, start at the index stored in the reserved1 field
> * of the section structure. Since the indirect symbol table entries
> * correspond to the entries in the section the number of indirect
> symbol table
> * entries is inferred from the size of the section divided by the
> size of the
> * entries in the section. For symbol pointers sections the size of
> the entries
> * in the section is 4 bytes and for symbol stubs sections the byte
> size of the
> * stubs is stored in the reserved2 field of the section structure.
> */
> #define S_NON_LAZY_SYMBOL_POINTERS 0x6 /* section with only
> non-lazy
> symbol pointers */
> #define S_LAZY_SYMBOL_POINTERS 0x7 /* section with only
> lazy symbol
> pointers */
> #define S_SYMBOL_STUBS 0x8 /* section with only symbol
> stubs, byte size of stub in
> the reserved2 field */
> #define S_MOD_INIT_FUNC_POINTERS 0x9 /* section with only function
> pointers for initialization*/
> #define S_MOD_TERM_FUNC_POINTERS 0xa /* section with only function
> pointers for termination */
> #define S_COALESCED 0xb /* section contains symbols that
> are to be coalesced */
> #define S_GB_ZEROFILL 0xc /* zero fill on demand section
> (that can be larger than 4
> gigabytes) */
> #define S_INTERPOSING 0xd /* section with only pairs of
> function pointers for
> interposing */
> #define S_16BYTE_LITERALS 0xe /* section with only 16 byte
> literals */
> #define S_DTRACE_DOF 0xf /* section contains
> DTrace Object Format */
> #define S_LAZY_DYLIB_SYMBOL_POINTERS 0x10 /* section with only
lazy
> symbol pointers to lazy
> loaded dylibs */
> /*
> * Constants for the section attributes part of the flags field of a
> section
> * structure.
> */
> #define SECTION_ATTRIBUTES_USR 0xff000000 /* User setable
> attributes */
> #define S_ATTR_PURE_INSTRUCTIONS 0x80000000 /* section contains only
true
> machine instructions */
> #define S_ATTR_NO_TOC 0x40000000 /* section contains coalesced
> symbols that are not to be
> in a ranlib table of
> contents */
> #define S_ATTR_STRIP_STATIC_SYMS 0x20000000 /* ok to strip static
symbols
> in this section in files
> with the MH_DYLDLINK flag */
> #define S_ATTR_NO_DEAD_STRIP 0x10000000 /* no dead stripping */
> #define S_ATTR_LIVE_SUPPORT 0x08000000 /* blocks are live if they
> reference live blocks */
> #define S_ATTR_SELF_MODIFYING_CODE 0x04000000 /* Used with i386
> code stubs
> written on by dyld */
> /*
> * If a segment contains any sections marked with S_ATTR_DEBUG then all
> * sections in that segment must have this attribute. No section
> other than
> * a section marked with this attribute may reference the contents of this
> * section. A section with this attribute may contain no symbols and
> must have
> * a section type S_REGULAR. The static linker will not copy section
> contents
> * from sections with this attribute into its output file. These sections
> * generally contain DWARF debugging info.
> */
> #define S_ATTR_DEBUG 0x02000000 /* a debug section */
> #define SECTION_ATTRIBUTES_SYS 0x00ffff00 /* system setable
> attributes */
> #define S_ATTR_SOME_INSTRUCTIONS 0x00000400 /* section contains some
> machine instructions */
> #define S_ATTR_EXT_RELOC 0x00000200 /* section has external
> relocation entries */
> #define S_ATTR_LOC_RELOC 0x00000100 /* section has local
> relocation entries */
>
>
> /*
> * The names of segments and sections in them are mostly meaningless to the
> * link-editor. But there are few things to support traditional UNIX
> * executables that require the link-editor and assembler to use some names
> * agreed upon by convention.
> *
> * The initial protection of the "__TEXT" segment has write protection
> turned
> * off (not writeable).
> *
> * The link-editor will allocate common symbols at the end of the
> "__common"
> * section in the "__DATA" segment. It will create the section and segment
> * if needed.
> */
>
> /* The currently known segment names and the section names in those
> segments */
>
> #define SEG_PAGEZERO "__PAGEZERO" /* the pagezero segment
> which has no */
> /* protections and catches NULL */
> /* references for MH_EXECUTE files */
>
>
> #define SEG_TEXT "__TEXT" /* the tradition UNIX text segment */
> #define SECT_TEXT "__text" /* the real text part of the text */
> /* section no headers, and no padding */
> #define SECT_FVMLIB_INIT0 "__fvmlib_init0" /* the fvmlib
> initialization */
> /* section */
> #define SECT_FVMLIB_INIT1 "__fvmlib_init1" /* the section following
> the */
> /* fvmlib initialization */
> /* section */
>
> #define SEG_DATA "__DATA" /* the tradition UNIX data segment */
> #define SECT_DATA "__data" /* the real initialized data section */
> /* no padding, no bss overlap */
> #define SECT_BSS "__bss" /* the real uninitialized data
> section*/
> /* no padding */
> #define SECT_COMMON "__common" /* the section common symbols are */
> /* allocated in by the link editor */
>
> #define SEG_OBJC "__OBJC" /* objective-C runtime segment */
> #define SECT_OBJC_SYMBOLS "__symbol_table" /* symbol table */
> #define SECT_OBJC_MODULES "__module_info" /* module information */
> #define SECT_OBJC_STRINGS "__selector_strs" /* string table */
> #define SECT_OBJC_REFS "__selector_refs" /* string table */
>
> #define SEG_ICON "__ICON" /* the icon segment */
> #define SECT_ICON_HEADER "__header" /* the icon headers */
> #define SECT_ICON_TIFF "__tiff" /* the icons in tiff format */
>
> #define SEG_LINKEDIT "__LINKEDIT" /* the segment containing
> all structs */
> /* created and maintained by the link */
> /* editor. Created with -seglinkedit */
> /* option to ld(1) for MH_EXECUTE and */
> /* FVMLIB file types only */
>
> #define SEG_UNIXSTACK "__UNIXSTACK" /* the unix stack segment */
>
> #define SEG_IMPORT "__IMPORT" /* the segment for the self (dyld) */
> /* modifing code stubs that has read, */
> /* write and execute permissions */
>
> /*
> * Fixed virtual memory shared libraries are identified by two things. The
> * target pathname (the name of the library as found for execution),
> and the
> * minor version number. The address of where the headers are loaded is in
> * header_addr. (THIS IS OBSOLETE and no longer supported).
> */
> struct fvmlib {
> union lc_str name; /* library's target pathname */
> uint32_t minor_version; /* library's minor version number */
> uint32_t header_addr; /* library's header address */
> };
>
> /*
> * A fixed virtual shared library (filetype == MH_FVMLIB in the mach
> header)
> * contains a fvmlib_command (cmd == LC_IDFVMLIB) to identify the library.
> * An object that uses a fixed virtual shared library also contains a
> * fvmlib_command (cmd == LC_LOADFVMLIB) for each library it uses.
> * (THIS IS OBSOLETE and no longer supported).
> */
> struct fvmlib_command {
> uint32_t cmd; /* LC_IDFVMLIB or LC_LOADFVMLIB */
> uint32_t cmdsize; /* includes pathname string */
> struct fvmlib fvmlib; /* the library identification */
> };
>
> /*
> * Dynamicly linked shared libraries are identified by two things. The
> * pathname (the name of the library as found for execution), and the
> * compatibility version number. The pathname must match and the
> compatibility
> * number in the user of the library must be greater than or equal to the
> * library being used. The time stamp is used to record the time a
> library was
> * built and copied into user so it can be use to determined if the
> library used
> * at runtime is exactly the same as used to built the program.
> */
> struct dylib {
> union lc_str name; /* library's path name */
> uint32_t timestamp; /* library's build time stamp */
> uint32_t current_version; /* library's current version number */
> uint32_t compatibility_version; /* library's compatibility vers
> number*/
> };
>
> /*
> * A dynamically linked shared library (filetype == MH_DYLIB in the
> mach header)
> * contains a dylib_command (cmd == LC_ID_DYLIB) to identify the library.
> * An object that uses a dynamically linked shared library also contains a
> * dylib_command (cmd == LC_LOAD_DYLIB, LC_LOAD_WEAK_DYLIB, or
> * LC_REEXPORT_DYLIB) for each library it uses.
> */
> struct dylib_command {
> uint32_t cmd; /* LC_ID_DYLIB, LC_LOAD_{,WEAK_}DYLIB,
> LC_REEXPORT_DYLIB */
> uint32_t cmdsize; /* includes pathname string */
> struct dylib dylib; /* the library identification */
> };
>
> /*
> * A dynamically linked shared library may be a subframework of an umbrella
> * framework. If so it will be linked with "-umbrella umbrella_name" where
> * Where "umbrella_name" is the name of the umbrella framework. A
> subframework
> * can only be linked against by its umbrella framework or other
> subframeworks
> * that are part of the same umbrella framework. Otherwise the static link
> * editor produces an error and states to link against the umbrella
> framework.
> * The name of the umbrella framework for subframeworks is recorded in the
> * following structure.
> */
> struct sub_framework_command {
> uint32_t cmd; /* LC_SUB_FRAMEWORK */
> uint32_t cmdsize; /* includes umbrella string */
> union lc_str umbrella; /* the umbrella framework name */
> };
>
> /*
> * For dynamically linked shared libraries that are subframework of an
> umbrella
> * framework they can allow clients other than the umbrella framework
> or other
> * subframeworks in the same umbrella framework. To do this the
> subframework
> * is built with "-allowable_client client_name" and an LC_SUB_CLIENT load
> * command is created for each -allowable_client flag. The client_name is
> * usually a framework name. It can also be a name used for bundles
> clients
> * where the bundle is built with "-client_name client_name".
> */
> struct sub_client_command {
> uint32_t cmd; /* LC_SUB_CLIENT */
> uint32_t cmdsize; /* includes client string */
> union lc_str client; /* the client name */
> };
>
> /*
> * A dynamically linked shared library may be a sub_umbrella of an umbrella
> * framework. If so it will be linked with "-sub_umbrella
> umbrella_name" where
> * Where "umbrella_name" is the name of the sub_umbrella framework. When
> * staticly linking when -twolevel_namespace is in effect a twolevel
> namespace
> * umbrella framework will only cause its subframeworks and those
> frameworks
> * listed as sub_umbrella frameworks to be implicited linked in. Any other
> * dependent dynamic libraries will not be linked it when
> -twolevel_namespace
> * is in effect. The primary library recorded by the static linker when
> * resolving a symbol in these libraries will be the umbrella framework.
> * Zero or more sub_umbrella frameworks may be use by an umbrella
> framework.
> * The name of a sub_umbrella framework is recorded in the following
> structure.
> */
> struct sub_umbrella_command {
> uint32_t cmd; /* LC_SUB_UMBRELLA */
> uint32_t cmdsize; /* includes sub_umbrella string */
> union lc_str sub_umbrella; /* the sub_umbrella framework name */
> };
>
> /*
> * A dynamically linked shared library may be a sub_library of another
> shared
> * library. If so it will be linked with "-sub_library library_name" where
> * Where "library_name" is the name of the sub_library shared library.
> When
> * staticly linking when -twolevel_namespace is in effect a twolevel
> namespace
> * shared library will only cause its subframeworks and those frameworks
> * listed as sub_umbrella frameworks and libraries listed as
> sub_libraries to
> * be implicited linked in. Any other dependent dynamic libraries
> will not be
> * linked it when -twolevel_namespace is in effect. The primary library
> * recorded by the static linker when resolving a symbol in these libraries
> * will be the umbrella framework (or dynamic library). Zero or more
> sub_library
> * shared libraries may be use by an umbrella framework or (or dynamic
> library).
> * The name of a sub_library framework is recorded in the following
> structure.
> * For example /usr/lib/libobjc_profile.A.dylib would be recorded as
> "libobjc".
> */
> struct sub_library_command {
> uint32_t cmd; /* LC_SUB_LIBRARY */
> uint32_t cmdsize; /* includes sub_library string */
> union lc_str sub_library; /* the sub_library name */
> };
>
> /*
> * A program (filetype == MH_EXECUTE) that is
> * prebound to its dynamic libraries has one of these for each library that
> * the static linker used in prebinding. It contains a bit vector for the
> * modules in the library. The bits indicate which modules are bound
> (1) and
> * which are not (0) from the library. The bit for module 0 is the low bit
> * of the first byte. So the bit for the Nth module is:
> * (linked_modules[N/8] >> N%8) & 1
> */
> struct prebound_dylib_command {
> uint32_t cmd; /* LC_PREBOUND_DYLIB */
> uint32_t cmdsize; /* includes strings */
> union lc_str name; /* library's path name */
> uint32_t nmodules; /* number of modules in library */
> union lc_str linked_modules; /* bit vector of linked modules */
> };
>
> /*
> * A program that uses a dynamic linker contains a dylinker_command to
> identify
> * the name of the dynamic linker (LC_LOAD_DYLINKER). And a dynamic linker
> * contains a dylinker_command to identify the dynamic linker
> (LC_ID_DYLINKER).
> * A file can have at most one of these.
> */
> struct dylinker_command {
> uint32_t cmd; /* LC_ID_DYLINKER or LC_LOAD_DYLINKER */
> uint32_t cmdsize; /* includes pathname string */
> union lc_str name; /* dynamic linker's path name */
> };
>
> /*
> * Thread commands contain machine-specific data structures suitable for
> * use in the thread state primitives. The machine specific data
> structures
> * follow the struct thread_command as follows.
> * Each flavor of machine specific data structure is preceded by an
> unsigned
> * long constant for the flavor of that data structure, an uint32_t
> * that is the count of longs of the size of the state data structure
> and then
> * the state data structure follows. This triple may be repeated for many
> * flavors. The constants for the flavors, counts and state data structure
> * definitions are expected to be in the header file
> <machine/thread_status.h>.
> * These machine specific data structures sizes must be multiples of
> * 4 bytes The cmdsize reflects the total size of the thread_command
> * and all of the sizes of the constants for the flavors, counts and state
> * data structures.
> *
> * For executable objects that are unix processes there will be one
> * thread_command (cmd == LC_UNIXTHREAD) created for it by the link-editor.
> * This is the same as a LC_THREAD, except that a stack is automatically
> * created (based on the shell's limit for the stack size). Command
> arguments
> * and environment variables are copied onto that stack.
> */
> struct thread_command {
> uint32_t cmd; /* LC_THREAD or LC_UNIXTHREAD */
> uint32_t cmdsize; /* total size of this command */
> /* uint32_t flavor flavor of thread state */
> /* uint32_t count count of longs in thread state */
> /* struct XXX_thread_state state thread state for this flavor */
> /* ... */
> };
>
> /*
> * The routines command contains the address of the dynamic shared library
> * initialization routine and an index into the module table for the module
> * that defines the routine. Before any modules are used from the
> library the
> * dynamic linker fully binds the module that defines the
> initialization routine
> * and then calls it. This gets called before any module initialization
> * routines (used for C++ static constructors) in the library.
> */
> struct routines_command { /* for 32-bit architectures */
> uint32_t cmd; /* LC_ROUTINES */
> uint32_t cmdsize; /* total size of this command */
> uint32_t init_address; /* address of initialization routine */
> uint32_t init_module; /* index into the module table that */
> /* the init routine is defined in */
> uint32_t reserved1;
> uint32_t reserved2;
> uint32_t reserved3;
> uint32_t reserved4;
> uint32_t reserved5;
> uint32_t reserved6;
> };
>
> /*
> * The 64-bit routines command. Same use as above.
> */
> struct routines_command_64 { /* for 64-bit architectures */
> uint32_t cmd; /* LC_ROUTINES_64 */
> uint32_t cmdsize; /* total size of this command */
> uint64_t init_address; /* address of initialization routine */
> uint64_t init_module; /* index into the module table that */
> /* the init routine is defined in */
> uint64_t reserved1;
> uint64_t reserved2;
> uint64_t reserved3;
> uint64_t reserved4;
> uint64_t reserved5;
> uint64_t reserved6;
> };
>
> /*
> * The symtab_command contains the offsets and sizes of the link-edit
> 4.3BSD
> * "stab" style symbol table information as described in the header files
> * <nlist.h> and <stab.h>.
> */
> struct symtab_command {
> uint32_t cmd; /* LC_SYMTAB */
> uint32_t cmdsize; /* sizeof(struct symtab_command) */
> uint32_t symoff; /* symbol table offset */
> uint32_t nsyms; /* number of symbol table entries */
> uint32_t stroff; /* string table offset */
> uint32_t strsize; /* string table size in bytes */
> };
>
> /*
> * This is the second set of the symbolic information which is used to
> support
> * the data structures for the dynamically link editor.
> *
> * The original set of symbolic information in the symtab_command
> which contains
> * the symbol and string tables must also be present when this load
> command is
> * present. When this load command is present the symbol table is
> organized
> * into three groups of symbols:
> * local symbols (static and debugging symbols) - grouped by module
> * defined external symbols - grouped by module (sorted by name if
> not lib)
> * undefined external symbols (sorted by name if MH_BINDATLOAD is
> not set,
> * and in order the were seen by the static
> * linker if MH_BINDATLOAD is set)
> * In this load command there are offsets and counts to each of the
> three groups
> * of symbols.
> *
> * This load command contains a the offsets and sizes of the following new
> * symbolic information tables:
> * table of contents
> * module table
> * reference symbol table
> * indirect symbol table
> * The first three tables above (the table of contents, module table and
> * reference symbol table) are only present if the file is a
> dynamically linked
> * shared library. For executable and object modules, which are files
> * containing only one module, the information that would be in these three
> * tables is determined as follows:
> * table of contents - the defined external symbols are sorted by name
> * module table - the file contains only one module so everything in the
> * file is part of the module.
> * reference symbol table - is the defined and undefined external
> symbols
> *
> * For dynamically linked shared library files this load command also
> contains
> * offsets and sizes to the pool of relocation entries for all sections
> * separated into two groups:
> * external relocation entries
> * local relocation entries
> * For executable and object modules the relocation entries continue
> to hang
> * off the section structures.
> */
> struct dysymtab_command {
> uint32_t cmd; /* LC_DYSYMTAB */
> uint32_t cmdsize; /* sizeof(struct dysymtab_command) */
>
> /*
> * The symbols indicated by symoff and nsyms of the LC_SYMTAB load
> command
> * are grouped into the following three groups:
> * local symbols (further grouped by the module they are from)
> * defined external symbols (further grouped by the module they
> are from)
> * undefined symbols
> *
> * The local symbols are used only for debugging. The dynamic binding
> * process may have to use them to indicate to the debugger the local
> * symbols for a module that is being bound.
> *
> * The last two groups are used by the dynamic binding process to
> do the
> * binding (indirectly through the module table and the reference
> symbol
> * table when this is a dynamically linked shared library file).
> */
> uint32_t ilocalsym; /* index to local symbols */
> uint32_t nlocalsym; /* number of local symbols */
>
> uint32_t iextdefsym;/* index to externally defined symbols */
> uint32_t nextdefsym;/* number of externally defined symbols */
>
> uint32_t iundefsym; /* index to undefined symbols */
> uint32_t nundefsym; /* number of undefined symbols */
>
> /*
> * For the for the dynamic binding process to find which module a
> symbol
> * is defined in the table of contents is used (analogous to the ranlib
> * structure in an archive) which maps defined external symbols to
> modules
> * they are defined in. This exists only in a dynamically linked
> shared
> * library file. For executable and object modules the defined
> external
> * symbols are sorted by name and is use as the table of contents.
> */
> uint32_t tocoff; /* file offset to table of contents */
> uint32_t ntoc; /* number of entries in table of contents */
>
> /*
> * To support dynamic binding of "modules" (whole object files)
> the symbol
> * table must reflect the modules that the file was created from.
> This is
> * done by having a module table that has indexes and counts into
> the merged
> * tables for each module. The module structure that these two entries
> * refer to is described below. This exists only in a dynamically
> linked
> * shared library file. For executable and object modules the
> file only
> * contains one module so everything in the file belongs to the module.
> */
> uint32_t modtaboff; /* file offset to module table */
> uint32_t nmodtab; /* number of module table entries */
>
> /*
> * To support dynamic module binding the module structure for each
> module
> * indicates the external references (defined and undefined) each
> module
> * makes. For each module there is an offset and a count into the
> * reference symbol table for the symbols that the module references.
> * This exists only in a dynamically linked shared library file. For
> * executable and object modules the defined external symbols and the
> * undefined external symbols indicates the external references.
> */
> uint32_t extrefsymoff; /* offset to referenced symbol table */
> uint32_t nextrefsyms; /* number of referenced symbol table
> entries */
>
> /*
> * The sections that contain "symbol pointers" and "routine stubs" have
> * indexes and (implied counts based on the size of the section
> and fixed
> * size of the entry) into the "indirect symbol" table for each pointer
> * and stub. For every section of these two types the index into the
> * indirect symbol table is stored in the section header in the field
> * reserved1. An indirect symbol table entry is simply a 32bit
> index into
> * the symbol table to the symbol that the pointer or stub is
> referring to.
> * The indirect symbol table is ordered to match the entries in
> the section.
> */
> uint32_t indirectsymoff; /* file offset to the indirect symbol table */
> uint32_t nindirectsyms; /* number of indirect symbol table entries */
>
> /*
> * To support relocating an individual module in a library file
> quickly the
> * external relocation entries for each module in the library need
> to be
> * accessed efficiently. Since the relocation entries can't be
> accessed
> * through the section headers for a library file they are
> separated into
> * groups of local and external entries further grouped by module.
> In this
> * case the presents of this load command who's extreloff, nextrel,
> * locreloff and nlocrel fields are non-zero indicates that the
> relocation
> * entries of non-merged sections are not referenced through the
> section
> * structures (and the reloff and nreloc fields in the section
> headers are
> * set to zero).
> *
> * Since the relocation entries are not accessed through the
> section headers
> * this requires the r_address field to be something other than a
> section
> * offset to identify the item to be relocated. In this case
> r_address is
> * set to the offset from the vmaddr of the first LC_SEGMENT command.
> * For MH_SPLIT_SEGS images r_address is set to the the offset from the
> * vmaddr of the first read-write LC_SEGMENT command.
> *
> * The relocation entries are grouped by module and the module table
> * entries have indexes and counts into them for the group of external
> * relocation entries for that the module.
> *
> * For sections that are merged across modules there must not be any
> * remaining external relocation entries for them (for merged sections
> * remaining relocation entries must be local).
> */
> uint32_t extreloff; /* offset to external relocation entries */
> uint32_t nextrel; /* number of external relocation entries */
>
> /*
> * All the local relocation entries are grouped together (they are not
> * grouped by their module since they are only used if the object
> is moved
> * from it staticly link edited address).
> */
> uint32_t locreloff; /* offset to local relocation entries */
> uint32_t nlocrel; /* number of local relocation entries */
>
> };
>
> /*
> * An indirect symbol table entry is simply a 32bit index into the
> symbol table
> * to the symbol that the pointer or stub is refering to. Unless it
> is for a
> * non-lazy symbol pointer section for a defined symbol which strip(1) as
> * removed. In which case it has the value INDIRECT_SYMBOL_LOCAL. If the
> * symbol was also absolute INDIRECT_SYMBOL_ABS is or'ed with that.
> */
> #define INDIRECT_SYMBOL_LOCAL 0x80000000
> #define INDIRECT_SYMBOL_ABS 0x40000000
>
>
> /* a table of contents entry */
> struct dylib_table_of_contents {
> uint32_t symbol_index; /* the defined external symbol
> (index into the symbol table) */
> uint32_t module_index; /* index into the module table this symbol
> is defined in */
> };
>
> /* a module table entry */
> struct dylib_module {
> uint32_t module_name; /* the module name (index into string
> table) */
>
> uint32_t iextdefsym; /* index into externally defined symbols */
> uint32_t nextdefsym; /* number of externally defined symbols */
> uint32_t irefsym; /* index into reference symbol table */
> uint32_t nrefsym; /* number of reference symbol table entries */
> uint32_t ilocalsym; /* index into symbols for local symbols */
> uint32_t nlocalsym; /* number of local symbols */
>
> uint32_t iextrel; /* index into external relocation entries */
> uint32_t nextrel; /* number of external relocation entries */
>
> uint32_t iinit_iterm; /* low 16 bits are the index into the init
> section, high 16 bits are the index into
> the term section */
> uint32_t ninit_nterm; /* low 16 bits are the number of init section
> entries, high 16 bits are the number of
> term section entries */
>
> uint32_t /* for this module address of the start of */
> objc_module_info_addr; /* the (__OBJC,__module_info) section */
> uint32_t /* for this module size of */
> objc_module_info_size; /* the (__OBJC,__module_info) section */
> };
>
> /* a 64-bit module table entry */
> struct dylib_module_64 {
> uint32_t module_name; /* the module name (index into string
> table) */
>
> uint32_t iextdefsym; /* index into externally defined symbols */
> uint32_t nextdefsym; /* number of externally defined symbols */
> uint32_t irefsym; /* index into reference symbol table */
> uint32_t nrefsym; /* number of reference symbol table entries */
> uint32_t ilocalsym; /* index into symbols for local symbols */
> uint32_t nlocalsym; /* number of local symbols */
>
> uint32_t iextrel; /* index into external relocation entries */
> uint32_t nextrel; /* number of external relocation entries */
>
> uint32_t iinit_iterm; /* low 16 bits are the index into the init
> section, high 16 bits are the index into
> the term section */
> uint32_t ninit_nterm; /* low 16 bits are the number of init
> section
> entries, high 16 bits are the number of
> term section entries */
>
> uint32_t /* for this module size of */
> objc_module_info_size; /* the (__OBJC,__module_info) section */
> uint64_t /* for this module address of the start of */
> objc_module_info_addr; /* the (__OBJC,__module_info) section */
> };
>
> /*
> * The entries in the reference symbol table are used when loading the
> module
> * (both by the static and dynamic link editors) and if the module is
> unloaded
> * or replaced. Therefore all external symbols (defined and undefined) are
> * listed in the module's reference table. The flags describe the type of
> * reference that is being made. The constants for the flags are
> defined in
> * <mach-o/nlist.h> as they are also used for symbol table entries.
> */
> struct dylib_reference {
> uint32_t isym:24, /* index into the symbol table */
> flags:8; /* flags to indicate the type of reference */
> };
>
> /*
> * The twolevel_hints_command contains the offset and number of hints
> in the
> * two-level namespace lookup hints table.
> */
> struct twolevel_hints_command {
> uint32_t cmd; /* LC_TWOLEVEL_HINTS */
> uint32_t cmdsize; /* sizeof(struct twolevel_hints_command) */
> uint32_t offset; /* offset to the hint table */
> uint32_t nhints; /* number of hints in the hint table */
> };
>
> /*
> * The entries in the two-level namespace lookup hints table are
> twolevel_hint
> * structs. These provide hints to the dynamic link editor where to start
> * looking for an undefined symbol in a two-level namespace image. The
> * isub_image field is an index into the sub-images (sub-frameworks and
> * sub-umbrellas list) that made up the two-level image that the undefined
> * symbol was found in when it was built by the static link editor. If
> * isub-image is 0 the the symbol is expected to be defined in library
> and not
> * in the sub-images. If isub-image is non-zero it is an index into
> the array
> * of sub-images for the umbrella with the first index in the
> sub-images being
> * 1. The array of sub-images is the ordered list of sub-images of the
> umbrella
> * that would be searched for a symbol that has the umbrella recorded
> as its
> * primary library. The table of contents index is an index into the
> * library's table of contents. This is used as the starting point of the
> * binary search or a directed linear search.
> */
> struct twolevel_hint {
> uint32_t
> isub_image:8, /* index into the sub images */
> itoc:24; /* index into the table of contents */
> };
>
> /*
> * The prebind_cksum_command contains the value of the original check
> sum for
> * prebound files or zero. When a prebound file is first created or
> modified
> * for other than updating its prebinding information the value of the
> check sum
> * is set to zero. When the file has it prebinding re-done and if the
> value of
> * the check sum is zero the original check sum is calculated and stored in
> * cksum field of this load command in the output file. If when the
> prebinding
> * is re-done and the cksum field is non-zero it is left unchanged from the
> * input file.
> */
> struct prebind_cksum_command {
> uint32_t cmd; /* LC_PREBIND_CKSUM */
> uint32_t cmdsize; /* sizeof(struct prebind_cksum_command) */
> uint32_t cksum; /* the check sum or zero */
> };
>
> /*
> * The uuid load command contains a single 128-bit unique random
> number that
> * identifies an object produced by the static link editor.
> */
> struct uuid_command {
> uint32_t cmd; /* LC_UUID */
> uint32_t cmdsize; /* sizeof(struct uuid_command) */
> uint8_t uuid[16]; /* the 128-bit uuid */
> };
>
> /*
> * The rpath_command contains a path which at runtime should be added to
> * the current run path used to find @rpath prefixed dylibs.
> */
> struct rpath_command {
> uint32_t cmd; /* LC_RPATH */
> uint32_t cmdsize; /* includes string */
> union lc_str path; /* path to add to run path */
> };
>
> /*
> * The linkedit_data_command contains the offsets and sizes of a blob
> * of data in the __LINKEDIT segment.
> */
> struct linkedit_data_command {
> uint32_t cmd; /* LC_CODE_SIGNATURE or
> LC_SEGMENT_SPLIT_INFO */
> uint32_t cmdsize; /* sizeof(struct linkedit_data_command) */
> uint32_t dataoff; /* file offset of data in __LINKEDIT segment */
> uint32_t datasize; /* file size of data in __LINKEDIT segment */
> };
>
> /*
> * The encryption_info_command contains the file offset and size of an
> * of an encrypted segment.
> */
> struct encryption_info_command {
> uint32_t cmd; /* LC_ENCRYPTION_INFO */
> uint32_t cmdsize; /* sizeof(struct encryption_info_command) */
> uint32_t cryptoff; /* file offset of encrypted range */
> uint32_t cryptsize; /* file size of encrypted range */
> uint32_t cryptid; /* which enryption system,
> 0 means not-encrypted yet */
> };
>
> /*
> * The dyld_info_command contains the file offsets and sizes of
> * the new compressed form of the information dyld needs to
> * load the image. This information is used by dyld on Mac OS X
> * 10.6 and later. All information pointed to by this command
> * is encoded using byte streams, so no endian swapping is needed
> * to interpret it.
> */
> struct dyld_info_command {
> uint32_t cmd; /* LC_DYLD_INFO or LC_DYLD_INFO_ONLY */
> uint32_t cmdsize; /* sizeof(struct dyld_info_command) */
>
> /*
> * Dyld rebases an image whenever dyld loads it at an address different
> * from its preferred address. The rebase information is a stream
> * of byte sized opcodes whose symbolic names start with
> REBASE_OPCODE_.
> * Conceptually the rebase information is a table of tuples:
> * <seg-index, seg-offset, type>
> * The opcodes are a compressed way to encode the table by only
> * encoding when a column changes. In addition simple patterns
> * like "every n'th offset for m times" can be encoded in a few
> * bytes.
> */
> uint32_t rebase_off; /* file offset to rebase info */
> uint32_t rebase_size; /* size of rebase info */
>
> /*
> * Dyld binds an image during the loading process, if the image
> * requires any pointers to be initialized to symbols in other images.
> * The rebase information is a stream of byte sized
> * opcodes whose symbolic names start with BIND_OPCODE_.
> * Conceptually the bind information is a table of tuples:
> * <seg-index, seg-offset, type, symbol-library-ordinal,
> symbol-name, addend>
> * The opcodes are a compressed way to encode the table by only
> * encoding when a column changes. In addition simple patterns
> * like for runs of pointers initialzed to the same value can be
> * encoded in a few bytes.
> */
> uint32_t bind_off; /* file offset to binding info */
> uint32_t bind_size; /* size of binding info */
>
> /*
> * Some C++ programs require dyld to unique symbols so that all
> * images in the process use the same copy of some code/data.
> * This step is done after binding. The content of the weak_bind
> * info is an opcode stream like the bind_info. But it is sorted
> * alphabetically by symbol name. This enable dyld to walk
> * all images with weak binding information in order and look
> * for collisions. If there are no collisions, dyld does
> * no updating. That means that some fixups are also encoded
> * in the bind_info. For instance, all calls to "operator new"
> * are first bound to libstdc++.dylib using the information
> * in bind_info. Then if some image overrides operator new
> * that is detected when the weak_bind information is processed
> * and the call to operator new is then rebound.
> */
> uint32_t weak_bind_off; /* file offset to weak binding info */
> uint32_t weak_bind_size; /* size of weak binding info */
>
> /*
> * Some uses of external symbols do not need to be bound immediately.
> * Instead they can be lazily bound on first use. The lazy_bind
> * are contains a stream of BIND opcodes to bind all lazy symbols.
> * Normal use is that dyld ignores the lazy_bind section when
> * loading an image. Instead the static linker arranged for the
> * lazy pointer to initially point to a helper function which
> * pushes the offset into the lazy_bind area for the symbol
> * needing to be bound, then jumps to dyld which simply adds
> * the offset to lazy_bind_off to get the information on what
> * to bind.
> */
> uint32_t lazy_bind_off; /* file offset to lazy binding info */
> uint32_t lazy_bind_size; /* size of lazy binding infs */
>
> /*
> * The symbols exported by a dylib are encoded in a trie. This
> * is a compact representation that factors out common prefixes.
> * It also reduces LINKEDIT pages in RAM because it encodes all
> * information (name, address, flags) in one small, contiguous range.
> * The export area is a stream of nodes. The first node sequentially
> * is the start node for the trie.
> *
> * Nodes for a symbol start with a byte that is the length of
> * the exported symbol information for the string so far.
> * If there is no exported symbol, the byte is zero. If there
> * is exported info, it follows the length byte. The exported
> * info normally consists of a flags and offset both encoded
> * in uleb128. The offset is location of the content named
> * by the symbol. It is the offset from the mach_header for
> * the image.
> *
> * After the initial byte and optional exported symbol information
> * is a byte of how many edges (0-255) that this node has leaving
> * it, followed by each edge.
> * Each edge is a zero terminated cstring of the addition chars
> * in the symbol, followed by a uleb128 offset for the node that
> * edge points to.
> *
> */
> uint32_t export_off; /* file offset to lazy binding info */
> uint32_t export_size; /* size of lazy binding infs */
> };
>
> /*
> * The following are used to encode rebasing information
> */
> #define REBASE_TYPE_POINTER 1
> #define REBASE_TYPE_TEXT_ABSOLUTE32 2
> #define REBASE_TYPE_TEXT_PCREL32 3
>
> #define REBASE_OPCODE_MASK 0xF0
> #define REBASE_IMMEDIATE_MASK 0x0F
> #define REBASE_OPCODE_DONE 0x00
> #define REBASE_OPCODE_SET_TYPE_IMM 0x10
> #define REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x20
> #define REBASE_OPCODE_ADD_ADDR_ULEB 0x30
> #define REBASE_OPCODE_ADD_ADDR_IMM_SCALED 0x40
> #define REBASE_OPCODE_DO_REBASE_IMM_TIMES 0x50
> #define REBASE_OPCODE_DO_REBASE_ULEB_TIMES 0x60
> #define REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB 0x70
> #define REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB 0x80
>
>
> /*
> * The following are used to encode binding information
> */
> #define BIND_TYPE_POINTER 1
> #define BIND_TYPE_TEXT_ABSOLUTE32 2
> #define BIND_TYPE_TEXT_PCREL32 3
>
> #define BIND_SPECIAL_DYLIB_SELF 0
> #define BIND_SPECIAL_DYLIB_MAIN_EXECUTABLE -1
> #define BIND_SPECIAL_DYLIB_FLAT_LOOKUP -2
>
> #define BIND_SYMBOL_FLAGS_WEAK_IMPORT 0x1
> #define BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION 0x8
>
> #define BIND_OPCODE_MASK 0xF0
> #define BIND_IMMEDIATE_MASK 0x0F
> #define BIND_OPCODE_DONE 0x00
> #define BIND_OPCODE_SET_DYLIB_ORDINAL_IMM 0x10
> #define BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB 0x20
> #define BIND_OPCODE_SET_DYLIB_SPECIAL_IMM 0x30
> #define BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM 0x40
> #define BIND_OPCODE_SET_TYPE_IMM 0x50
> #define BIND_OPCODE_SET_ADDEND_SLEB 0x60
> #define BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB 0x70
> #define BIND_OPCODE_ADD_ADDR_ULEB 0x80
> #define BIND_OPCODE_DO_BIND 0x90
> #define BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB 0xA0
> #define BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED 0xB0
> #define BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB 0xC0
>
>
> /*
> * The following are used on the flags byte of a terminal node
> * in the export information.
> */
> #define EXPORT_SYMBOL_FLAGS_KIND_MASK 0x03
> #define EXPORT_SYMBOL_FLAGS_KIND_REGULAR 0x00
> #define EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL 0x01
> #define EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION 0x04
> #define EXPORT_SYMBOL_FLAGS_INDIRECT_DEFINITION 0x08
> #define EXPORT_SYMBOL_FLAGS_HAS_SPECIALIZATIONS 0x10
>
> /*
> * The symseg_command contains the offset and size of the GNU style
> * symbol table information as described in the header file <symseg.h>.
> * The symbol roots of the symbol segments must also be aligned properly
> * in the file. So the requirement of keeping the offsets aligned to a
> * multiple of a 4 bytes translates to the length field of the symbol
> * roots also being a multiple of a long. Also the padding must again be
> * zeroed. (THIS IS OBSOLETE and no longer supported).
> */
> struct symseg_command {
> uint32_t cmd; /* LC_SYMSEG */
> uint32_t cmdsize; /* sizeof(struct symseg_command) */
> uint32_t offset; /* symbol segment offset */
> uint32_t size; /* symbol segment size in bytes */
> };
>
> /*
> * The ident_command contains a free format string table following the
> * ident_command structure. The strings are null terminated and the
> size of
> * the command is padded out with zero bytes to a multiple of 4 bytes/
> * (THIS IS OBSOLETE and no longer supported).
> */
> struct ident_command {
> uint32_t cmd; /* LC_IDENT */
> uint32_t cmdsize; /* strings that follow this command */
> };
>
> /*
> * The fvmfile_command contains a reference to a file to be loaded at the
> * specified virtual address. (Presently, this command is reserved for
> * internal use. The kernel ignores this command when loading a
> program into
> * memory).
> */
> struct fvmfile_command {
> uint32_t cmd; /* LC_FVMFILE */
> uint32_t cmdsize; /* includes pathname string */
> union lc_str name; /* files pathname */
> uint32_t header_addr; /* files virtual address */
> };
>
> #endif /* _MACHO_LOADER_H_ */
>
>
> On 07/26/10 15:21, Camm Maguire wrote:
>> Greetings1
>>
>> Matt Kaufmann<address@hidden> writes:
>>
>>
>>> Hi, Camm --
>>>
>>> I'd be very happy to give you access to my laptop, which is the Intel
>>> box in question (which is running Mac OS 10.6.4, by the way). But I
>>> don't know how to do it. I think could create an account, but how do
>>>
>> Well, this looks difficult. It would be great if you could send me
>> these files:
>>
>> #include<mach-o/loader.h>
>> #include<mach-o/nlist.h>
>>
>> #include<mach/mach.h>
>>
>> Separately, if you are interested, I can send you a small patch that
>> steps around rsym_macosx all together. Of course, if you are still on
>> vacation, please don't bother about this until you get home! If there
>> is a machine at ut you could point me to, that of course would be
>> great, but if you'd have to ask David Ranger, perhaps I could just
>> email him myself.
>>
>> Last update, gcl can now run cross compiled for windows on Linux under
>> wine. maxima just passed all its tests. Checking acl2 .... The idea
>> being to get one tree verified on both these seldom used machines (mac
>> and windows) and then finalize gcl 2.6.8.
>>
>> Take care,
>>
>>
>>> -- Matt
>>> From: Camm Maguire<address@hidden>
>>> Date: Mon, 26 Jul 2010 11:07:47 -0400
>>> X-SpamAssassin-Status: No, hits=0.2 required=5.0
>>> X-UTCS-Spam-Status: No, hits=-180 required=165
>>>
>>> Greetings! Sigh. I was afraid of this. There are multiple versions
>>> of mac os x out there which apparently differ in significant ways.
>>> Not sure of the versioning system, but 10.4, 10.5, and 10.6 sound
>>> familiar. This code was well tested on the axiom intel mac box.
Could
>>> you please provide access to the box in question?
>>>
>>> Take care,
>>> --
>>> Camm Maguire address@hidden
>>>
==========================================================================
>>> "The earth is but one country, and mankind its citizens." --
Baha'u'llah
>>>
>>>
>>>
>>>
>>>
>>
>
>
>
>
--
Camm Maguire address@hidden
==========================================================================
"The earth is but one country, and mankind its citizens." -- Baha'u'llah
/$ cat /usr/include/mach-o/nlist.h
/*
* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#ifndef _MACHO_NLIST_H_
#define _MACHO_NLIST_H_
/* $NetBSD: nlist.h,v 1.5 1994/10/26 00:56:11 cgd Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nlist.h 8.2 (Berkeley) 1/21/94
*/
#include <stdint.h>
/*
* Format of a symbol table entry of a Mach-O file for 32-bit architectures.
* Modified from the BSD format. The modifications from the original format
* were changing n_other (an unused field) to n_sect and the addition of the
* N_SECT type. These modifications are required to support symbols in a larger
* number of sections not just the three sections (text, data and bss) in a BSD
* file.
*/
struct nlist {
union {
#ifndef __LP64__
char *n_name; /* for use when in-core */
#endif
int32_t n_strx; /* index into the string table */
} n_un;
uint8_t n_type; /* type flag, see below */
uint8_t n_sect; /* section number or NO_SECT */
int16_t n_desc; /* see <mach-o/stab.h> */
uint32_t n_value; /* value of this symbol (or stab offset) */
};
/*
* This is the symbol table entry structure for 64-bit architectures.
*/
struct nlist_64 {
union {
uint32_t n_strx; /* index into the string table */
} n_un;
uint8_t n_type; /* type flag, see below */
uint8_t n_sect; /* section number or NO_SECT */
uint16_t n_desc; /* see <mach-o/stab.h> */
uint64_t n_value; /* value of this symbol (or stab offset) */
};
/*
* Symbols with a index into the string table of zero (n_un.n_strx == 0) are
* defined to have a null, "", name. Therefore all string indexes to non null
* names must not have a zero string index. This is bit historical information
* that has never been well documented.
*/
/*
* The n_type field really contains four fields:
* unsigned char N_STAB:3,
* N_PEXT:1,
* N_TYPE:3,
* N_EXT:1;
* which are used via the following masks.
*/
#define N_STAB 0xe0 /* if any of these bits set, a symbolic debugging entry */
#define N_PEXT 0x10 /* private external symbol bit */
#define N_TYPE 0x0e /* mask for the type bits */
#define N_EXT 0x01 /* external symbol bit, set for external symbols */
/*
* Only symbolic debugging entries have some of the N_STAB bits set and if any
* of these bits are set then it is a symbolic debugging entry (a stab). In
* which case then the values of the n_type field (the entire field) are given
* in <mach-o/stab.h>
*/
/*
* Values for N_TYPE bits of the n_type field.
*/
#define N_UNDF 0x0 /* undefined, n_sect == NO_SECT */
#define N_ABS 0x2 /* absolute, n_sect == NO_SECT */
#define N_SECT 0xe /* defined in section number n_sect */
#define N_PBUD 0xc /* prebound undefined (defined in a dylib) */
#define N_INDR 0xa /* indirect */
/*
* If the type is N_INDR then the symbol is defined to be the same as another
* symbol. In this case the n_value field is an index into the string table
* of the other symbol's name. When the other symbol is defined then they both
* take on the defined type and value.
*/
/*
* If the type is N_SECT then the n_sect field contains an ordinal of the
* section the symbol is defined in. The sections are numbered from 1 and
* refer to sections in order they appear in the load commands for the file
* they are in. This means the same ordinal may very well refer to different
* sections in different files.
*
* The n_value field for all symbol table entries (including N_STAB's) gets
* updated by the link editor based on the value of it's n_sect field and where
* the section n_sect references gets relocated. If the value of the n_sect
* field is NO_SECT then it's n_value field is not changed by the link editor.
*/
#define NO_SECT 0 /* symbol is not in any section */
#define MAX_SECT 255 /* 1 thru 255 inclusive */
/*
* Common symbols are represented by undefined (N_UNDF) external (N_EXT) types
* who's values (n_value) are non-zero. In which case the value of the n_value
* field is the size (in bytes) of the common symbol. The n_sect field is set
* to NO_SECT. The alignment of a common symbol may be set as a power of 2
* between 2^1 and 2^15 as part of the n_desc field using the macros below. If
* the alignment is not set (a value of zero) then natural alignment based on
* the size is used.
*/
#define GET_COMM_ALIGN(n_desc) (((n_desc) >> 8) & 0x0f)
#define SET_COMM_ALIGN(n_desc,align) \
(n_desc) = (((n_desc) & 0xf0ff) | (((align) & 0x0f) << 8))
/*
* To support the lazy binding of undefined symbols in the dynamic link-editor,
* the undefined symbols in the symbol table (the nlist structures) are marked
* with the indication if the undefined reference is a lazy reference or
* non-lazy reference. If both a non-lazy reference and a lazy reference is
* made to the same symbol the non-lazy reference takes precedence. A reference
* is lazy only when all references to that symbol are made through a symbol
* pointer in a lazy symbol pointer section.
*
* The implementation of marking nlist structures in the symbol table for
* undefined symbols will be to use some of the bits of the n_desc field as a
* reference type. The mask REFERENCE_TYPE will be applied to the n_desc field
* of an nlist structure for an undefined symbol to determine the type of
* undefined reference (lazy or non-lazy).
*
* The constants for the REFERENCE FLAGS are propagated to the reference table
* in a shared library file. In that case the constant for a defined symbol,
* REFERENCE_FLAG_DEFINED, is also used.
*/
/* Reference type bits of the n_desc field of undefined symbols */
#define REFERENCE_TYPE 0x7
/* types of references */
#define REFERENCE_FLAG_UNDEFINED_NON_LAZY 0
#define REFERENCE_FLAG_UNDEFINED_LAZY 1
#define REFERENCE_FLAG_DEFINED 2
#define REFERENCE_FLAG_PRIVATE_DEFINED 3
#define REFERENCE_FLAG_PRIVATE_UNDEFINED_NON_LAZY 4
#define REFERENCE_FLAG_PRIVATE_UNDEFINED_LAZY 5
/*
* To simplify stripping of objects that use are used with the dynamic link
* editor, the static link editor marks the symbols defined an object that are
* referenced by a dynamicly bound object (dynamic shared libraries, bundles).
* With this marking strip knows not to strip these symbols.
*/
#define REFERENCED_DYNAMICALLY 0x0010
/*
* For images created by the static link editor with the -twolevel_namespace
* option in effect the flags field of the mach header is marked with
* MH_TWOLEVEL. And the binding of the undefined references of the image are
* determined by the static link editor. Which library an undefined symbol is
* bound to is recorded by the static linker in the high 8 bits of the n_desc
* field using the SET_LIBRARY_ORDINAL macro below. The ordinal recorded
* references the libraries listed in the Mach-O's LC_LOAD_DYLIB load commands
* in the order they appear in the headers. The library ordinals start from 1.
* For a dynamic library that is built as a two-level namespace image the
* undefined references from module defined in another use the same nlist struct
* an in that case SELF_LIBRARY_ORDINAL is used as the library ordinal. For
* defined symbols in all images they also must have the library ordinal set to
* SELF_LIBRARY_ORDINAL. The EXECUTABLE_ORDINAL refers to the executable
* image for references from plugins that refer to the executable that loads
* them.
*
* The DYNAMIC_LOOKUP_ORDINAL is for undefined symbols in a two-level namespace
* image that are looked up by the dynamic linker with flat namespace semantics.
* This ordinal was added as a feature in Mac OS X 10.3 by reducing the
* value of MAX_LIBRARY_ORDINAL by one. So it is legal for existing binaries
* or binaries built with older tools to have 0xfe (254) dynamic libraries. In
* this case the ordinal value 0xfe (254) must be treated as a library ordinal
* for compatibility.
*/
#define GET_LIBRARY_ORDINAL(n_desc) (((n_desc) >> 8) & 0xff)
#define SET_LIBRARY_ORDINAL(n_desc,ordinal) \
(n_desc) = (((n_desc) & 0x00ff) | (((ordinal) & 0xff) << 8))
#define SELF_LIBRARY_ORDINAL 0x0
#define MAX_LIBRARY_ORDINAL 0xfd
#define DYNAMIC_LOOKUP_ORDINAL 0xfe
#define EXECUTABLE_ORDINAL 0xff
/*
* The bit 0x0020 of the n_desc field is used for two non-overlapping purposes
* and has two different symbolic names, N_NO_DEAD_STRIP and N_DESC_DISCARDED.
*/
/*
* The N_NO_DEAD_STRIP bit of the n_desc field only ever appears in a
* relocatable .o file (MH_OBJECT filetype). And is used to indicate to the
* static link editor it is never to dead strip the symbol.
*/
#define N_NO_DEAD_STRIP 0x0020 /* symbol is not to be dead stripped */
/*
* The N_DESC_DISCARDED bit of the n_desc field never appears in linked image.
* But is used in very rare cases by the dynamic link editor to mark an in
* memory symbol as discared and longer used for linking.
*/
#define N_DESC_DISCARDED 0x0020 /* symbol is discarded */
/*
* The N_WEAK_REF bit of the n_desc field indicates to the dynamic linker that
* the undefined symbol is allowed to be missing and is to have the address of
* zero when missing.
*/
#define N_WEAK_REF 0x0040 /* symbol is weak referenced */
/*
* The N_WEAK_DEF bit of the n_desc field indicates to the static and dynamic
* linkers that the symbol definition is weak, allowing a non-weak symbol to
* also be used which causes the weak definition to be discared. Currently this
* is only supported for symbols in coalesed sections.
*/
#define N_WEAK_DEF 0x0080 /* coalesed symbol is a weak definition */
/*
* The N_REF_TO_WEAK bit of the n_desc field indicates to the dynamic linker
* that the undefined symbol should be resolved using flat namespace searching.
*/
#define N_REF_TO_WEAK 0x0080 /* reference to a weak symbol */
/*
* The N_ARM_THUMB_DEF bit of the n_desc field indicates that the symbol is
* a defintion of a Thumb function.
*/
#define N_ARM_THUMB_DEF 0x0008 /* symbol is a Thumb function (ARM) */
#ifndef __STRICT_BSD__
#if __cplusplus
extern "C" {
#endif /* __cplusplus */
/*
* The function nlist(3) from the C library.
*/
extern int nlist (const char *filename, struct nlist *list);
#if __cplusplus
}
#endif /* __cplusplus */
#endif /* __STRICT_BSD__ */
#endif /* _MACHO_LIST_H_ */
/$ cat /usr/include/nlist.h
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nlist.h 8.2 (Berkeley) 1/21/94
*/
#ifndef _NLIST_H_
#define _NLIST_H_
/*
* Symbol table entry format. The #ifdef's are so that programs including
* nlist.h can initialize nlist structures statically.
*/
struct nlist {
#ifdef _AOUT_INCLUDE_
union {
char *n_name; /* symbol name (in memory) */
long n_strx; /* file string table offset (on disk) */
} n_un;
#else
char *n_name; /* symbol name (in memory) */
#endif
#define N_UNDF 0x00 /* undefined */
#define N_ABS 0x02 /* absolute address */
#define N_TEXT 0x04 /* text segment */
#define N_DATA 0x06 /* data segment */
#define N_BSS 0x08 /* bss segment */
#define N_COMM 0x12 /* common reference */
#define N_FN 0x1e /* file name */
#define N_EXT 0x01 /* external (global) bit, OR'ed in */
#define N_TYPE 0x1e /* mask for all the type bits */
unsigned char n_type; /* type defines */
char n_other; /* spare */
#define n_hash n_desc /* used internally by ld(1); XXX */
short n_desc; /* used by stab entries */
unsigned long n_value; /* address/value of the symbol */
};
#define N_FORMAT "%08x" /* namelist value format; XXX */
#define N_STAB 0x0e0 /* mask for debugger symbols -- stab(5) */
#include <sys/cdefs.h>
__BEGIN_DECLS
int nlist(const char *, struct nlist *);
__END_DECLS
#endif /* !_NLIST_H_ */
/$
- [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/08
- [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/08
- Message not available
- Message not available
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- [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/25
- [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/25
- [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/25
- [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/26
- Message not available
- Message not available
- Message not available
- [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/26
- [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/26
- Re: [Gcl-devel] Re: ACL2 Version 4.0, George W. Dinolt, 2010/07/26
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0,
Matt Kaufmann <=
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Matt Kaufmann, 2010/07/27
- Re: [Gcl-devel] Re: ACL2 Version 4.0, Camm Maguire, 2010/07/27