projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| b0d623f7 A |
1 | /* |
| 2 | * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * This file contains Original Code and/or Modifications of Original Code | |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | /* | |
| 24 | * Relocation types used in the ppc implementation. Relocation entries for | |
| 25 | * things other than instructions use the same generic relocation as discribed | |
| 26 | * above and their r_type is RELOC_VANILLA. The rest of the relocation types | |
| 27 | * are for instructions. Since they are for instructions the r_address field | |
| 28 | * indicates the 32 bit instruction that the relocation is to be preformed on. | |
| 29 | * The fields r_pcrel and r_length are ignored for non-RELOC_VANILLA r_types | |
| 30 | * except for PPC_RELOC_BR14. | |
| 31 | * | |
| 32 | * For PPC_RELOC_BR14 if the r_length is the unused value 3, then the branch was | |
| 33 | * statically predicted setting or clearing the Y-bit based on the sign of the | |
| 34 | * displacement or the opcode. If this is the case the static linker must flip | |
| 35 | * the value of the Y-bit if the sign of the displacement changes for non-branch | |
| 36 | * always conditions. | |
| 37 | */ | |
| 38 | enum reloc_type_ppc | |
| 39 | { | |
| 40 | PPC_RELOC_VANILLA, /* generic relocation as discribed above */ | |
| 41 | PPC_RELOC_PAIR, /* the second relocation entry of a pair */ | |
| 42 | PPC_RELOC_BR14, /* 14 bit branch displacement (to a word address) */ | |
| 43 | PPC_RELOC_BR24, /* 24 bit branch displacement (to a word address) */ | |
| 44 | PPC_RELOC_HI16, /* a PAIR follows with the low half */ | |
| 45 | PPC_RELOC_LO16, /* a PAIR follows with the high half */ | |
| 46 | PPC_RELOC_HA16, /* Same as the RELOC_HI16 except the low 16 bits and the | |
| 47 | * high 16 bits are added together with the low 16 bits | |
| 48 | * sign extened first. This means if bit 15 of the low | |
| 49 | * 16 bits is set the high 16 bits stored in the | |
| 50 | * instruction will be adjusted. | |
| 51 | */ | |
| 52 | PPC_RELOC_LO14, /* Same as the LO16 except that the low 2 bits are not | |
| 53 | * stored in the instruction and are always zero. This | |
| 54 | * is used in double word load/store instructions. | |
| 55 | */ | |
| 56 | PPC_RELOC_SECTDIFF, /* a PAIR follows with subtract symbol value */ | |
| 57 | PPC_RELOC_PB_LA_PTR,/* prebound lazy pointer */ | |
| 58 | PPC_RELOC_HI16_SECTDIFF, /* section difference forms of above. a PAIR */ | |
| 59 | PPC_RELOC_LO16_SECTDIFF, /* follows these with subtract symbol value */ | |
| 60 | PPC_RELOC_HA16_SECTDIFF, | |
| 61 | PPC_RELOC_JBSR, | |
| 62 | PPC_RELOC_LO14_SECTDIFF, | |
| 63 | PPC_RELOC_LOCAL_SECTDIFF /* like PPC_RELOC_SECTDIFF, but the symbol | |
| 64 | referenced was local. */ | |
| 65 | }; |