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| /* | ||
| * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | ||
| * | ||
| * @APPLE_LICENSE_HEADER_START@ | ||
| * | ||
| * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights | ||
| * Reserved. 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 1.1 (the "License"). You may not use this file | ||
| * except in compliance with the License. Please obtain a copy of the | ||
| * License at http://www.apple.com/publicsource 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 OR NON- INFRINGEMENT. Please see the | ||
| * License for the specific language governing rights and limitations | ||
| * under the License. | ||
| * | ||
| * @APPLE_LICENSE_HEADER_END@ | ||
| */ | ||
| /* $NetBSD: exec.h,v 1.6 1994/10/27 04:16:05 cgd Exp $ */ | ||
|
|
||
| /* | ||
| * Copyright (c) 1993 Christopher G. Demetriou | ||
| * All rights reserved. | ||
| * | ||
| * 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. The name of the author may not be used to endorse or promote products | ||
| * derived from this software without specific prior written permission | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. | ||
| */ | ||
|
|
||
| #ifndef _MACHO_RELOC_H_ | ||
| #define _MACHO_RELOC_H_ | ||
|
|
||
| /* | ||
| * Format of a relocation entry of a Mach-O file. Modified from the 4.3BSD | ||
| * format. The modifications from the original format were changing the value | ||
| * of the r_symbolnum field for "local" (r_extern == 0) relocation entries. | ||
| * This modification is required to support symbols in an arbitrary number of | ||
| * sections not just the three sections (text, data and bss) in a 4.3BSD file. | ||
| * Also the last 4 bits have had the r_type tag added to them. | ||
| */ | ||
| struct relocation_info { | ||
| long r_address; /* offset in the section to what is being | ||
| relocated */ | ||
| unsigned int r_symbolnum:24, /* symbol index if r_extern == 1 or section | ||
| ordinal if r_extern == 0 */ | ||
| r_pcrel:1, /* was relocated pc relative already */ | ||
| r_length:2, /* 0=byte, 1=word, 2=long */ | ||
| r_extern:1, /* does not include value of sym referenced */ | ||
| r_type:4; /* if not 0, machine specific relocation type */ | ||
| }; | ||
| #define R_ABS 0 /* absolute relocation type for Mach-O files */ | ||
|
|
||
| /* | ||
| * The r_address is not really the address as it's name indicates but an offset. | ||
| * In 4.3BSD a.out objects this offset is from the start of the "segment" for | ||
| * which relocation entry is for (text or data). For Mach-O object files it is | ||
| * also an offset but from the start of the "section" for which the relocation | ||
| * entry is for. See comments in <mach-o/loader.h> about the r_address feild | ||
| * in images for used with the dynamic linker. | ||
| * | ||
| * In 4.3BSD a.out objects if r_extern is zero then r_symbolnum is an ordinal | ||
| * for the segment the symbol being relocated is in. These ordinals are the | ||
| * symbol types N_TEXT, N_DATA, N_BSS or N_ABS. In Mach-O object files these | ||
| * ordinals refer to the sections in the object file in the order their section | ||
| * structures appear in the headers of the object file they are in. The first | ||
| * section has the ordinal 1, the second 2, and so on. This means that the | ||
| * same ordinal in two different object files could refer to two different | ||
| * sections. And further could have still different ordinals when combined | ||
| * by the link-editor. The value R_ABS is used for relocation entries for | ||
| * absolute symbols which need no further relocation. | ||
| */ | ||
|
|
||
| /* | ||
| * For RISC machines some of the references are split across two instructions | ||
| * and the instruction does not contain the complete value of the reference. | ||
| * In these cases a second, or paired relocation entry, follows each of these | ||
| * relocation entries, using a PAIR r_type, which contains the other part of the | ||
| * reference not contained in the instruction. This other part is stored in the | ||
| * pair's r_address field. The exact number of bits of the other part of the | ||
| * reference store in the r_address field is dependent on the particular | ||
| * relocation type for the particular architecture. | ||
| */ | ||
|
|
||
| /* | ||
| * To make scattered loading by the link editor work correctly "local" | ||
| * relocation entries can't be used when the item to be relocated is the value | ||
| * of a symbol plus an offset (where the resulting expresion is outside the | ||
| * block the link editor is moving, a blocks are divided at symbol addresses). | ||
| * In this case. where the item is a symbol value plus offset, the link editor | ||
| * needs to know more than just the section the symbol was defined. What is | ||
| * needed is the actual value of the symbol without the offset so it can do the | ||
| * relocation correctly based on where the value of the symbol got relocated to | ||
| * not the value of the expression (with the offset added to the symbol value). | ||
| * So for the NeXT 2.0 release no "local" relocation entries are ever used when | ||
| * there is a non-zero offset added to a symbol. The "external" and "local" | ||
| * relocation entries remain unchanged. | ||
| * | ||
| * The implemention is quite messy given the compatibility with the existing | ||
| * relocation entry format. The ASSUMPTION is that a section will never be | ||
| * bigger than 2**24 - 1 (0x00ffffff or 16,777,215) bytes. This assumption | ||
| * allows the r_address (which is really an offset) to fit in 24 bits and high | ||
| * bit of the r_address field in the relocation_info structure to indicate | ||
| * it is really a scattered_relocation_info structure. Since these are only | ||
| * used in places where "local" relocation entries are used and not where | ||
| * "external" relocation entries are used the r_extern field has been removed. | ||
| * | ||
| * For scattered loading to work on a RISC machine where some of the references | ||
| * are split across two instructions the link editor needs to be assured that | ||
| * each reference has a unique 32 bit reference (that more than one reference is | ||
| * NOT sharing the same high 16 bits for example) so it move each referenced | ||
| * item independent of each other. Some compilers guarantees this but the | ||
| * compilers don't so scattered loading can be done on those that do guarantee | ||
| * this. | ||
| */ | ||
| #if defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__) | ||
| /* | ||
| * The reason for the ifdef's of __BIG_ENDIAN__ and __LITTLE_ENDIAN__ are that | ||
| * when stattered relocation entries were added the mistake of using a mask | ||
| * against a structure that is made up of bit fields was used. To make this | ||
| * design work this structure must be laid out in memory the same way so the | ||
| * mask can be applied can check the same bit each time (r_scattered). | ||
| */ | ||
| #endif /* defined(__BIG_ENDIAN__) || defined(__LITTLE_ENDIAN__) */ | ||
| #define R_SCATTERED 0x80000000 /* mask to be applied to the r_address field | ||
| of a relocation_info structure to tell that | ||
| is is really a scattered_relocation_info | ||
| stucture */ | ||
| struct scattered_relocation_info { | ||
| #ifdef __BIG_ENDIAN__ | ||
| unsigned int r_scattered:1, /* 1=scattered, 0=non-scattered (see above) */ | ||
| r_pcrel:1, /* was relocated pc relative already */ | ||
| r_length:2, /* 0=byte, 1=word, 2=long */ | ||
| r_type:4, /* if not 0, machine specific relocation type */ | ||
| r_address:24; /* offset in the section to what is being | ||
| relocated */ | ||
| long r_value; /* the value the item to be relocated is | ||
| refering to (without any offset added) */ | ||
| #endif /* __BIG_ENDIAN__ */ | ||
| #ifdef __LITTLE_ENDIAN__ | ||
| unsigned int | ||
| r_address:24, /* offset in the section to what is being | ||
| relocated */ | ||
| r_type:4, /* if not 0, machine specific relocation type */ | ||
| r_length:2, /* 0=byte, 1=word, 2=long */ | ||
| r_pcrel:1, /* was relocated pc relative already */ | ||
| r_scattered:1; /* 1=scattered, 0=non-scattered (see above) */ | ||
| long r_value; /* the value the item to be relocated is | ||
| refering to (without any offset added) */ | ||
| #endif /* __LITTLE_ENDIAN__ */ | ||
| }; | ||
|
|
||
| /* | ||
| * Relocation types used in a generic implementation. Relocation entries for | ||
| * nornal things use the generic relocation as discribed above and their r_type | ||
| * is GENERIC_RELOC_VANILLA (a value of zero). | ||
| * | ||
| * Another type of generic relocation, GENERIC_RELOC_SECTDIFF, is to support | ||
| * the difference of two symbols defined in different sections. That is the | ||
| * expression "symbol1 - symbol2 + constant" is a relocatable expression when | ||
| * both symbols are defined in some section. For this type of relocation the | ||
| * both relocations entries are scattered relocation entries. The value of | ||
| * symbol1 is stored in the first relocation entry's r_value field and the | ||
| * value of symbol2 is stored in the pair's r_value field. | ||
| * | ||
| * A special case for a prebound lazy pointer is needed to beable to set the | ||
| * value of the lazy pointer back to its non-prebound state. This is done | ||
| * using the GENERIC_RELOC_PB_LA_PTR r_type. This is a scattered relocation | ||
| * entry where the r_value feild is the value of the lazy pointer not prebound. | ||
| */ | ||
| enum reloc_type_generic | ||
| { | ||
| GENERIC_RELOC_VANILLA, /* generic relocation as discribed above */ | ||
| GENERIC_RELOC_PAIR, /* Only follows a GENRIC_RELOC_SECTDIFF */ | ||
| GENERIC_RELOC_SECTDIFF, | ||
| GENERIC_RELOC_PB_LA_PTR /* prebound lazy pointer */ | ||
| }; | ||
|
|
||
| #endif /* _MACHO_RELOC_H_ */ |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1 +1 @@ | ||
| 0 | ||
| 1 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +0,0 @@ | ||
| 7 | ||
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@@ -8,6 +8,7 @@ include $(MakeInc_cmd) | |
| include $(MakeInc_def) | ||
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| INSTINC_SUBDIRS = \ | ||
| random | ||
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| INSTINC_SUBDIRS_PPC = \ | ||
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| Original file line number | Diff line number | Diff line change |
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@@ -154,3 +154,7 @@ bsd_bufferinit() | |
| bufinit(); | ||
| } | ||
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| void | ||
| md_prepare_for_shutdown(int paniced, int howto, char * command) | ||
| { | ||
| } | ||
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