include/elf/ppc64.h

   1 /* PPC64 ELF support for BFD.
   2    Copyright 2003, 2005, 2009, 2010, 2011 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 #ifndef _ELF_PPC64_H
  22 #define _ELF_PPC64_H
  23
  24 #include "elf/reloc-macros.h"
  25
  26 /* Relocations.  */
  27 START_RELOC_NUMBERS (elf_ppc64_reloc_type)
  28   RELOC_NUMBER (R_PPC64_NONE,                0)
  29   RELOC_NUMBER (R_PPC64_ADDR32,              1)
  30   RELOC_NUMBER (R_PPC64_ADDR24,              2)
  31   RELOC_NUMBER (R_PPC64_ADDR16,              3)
  32   RELOC_NUMBER (R_PPC64_ADDR16_LO,           4)
  33   RELOC_NUMBER (R_PPC64_ADDR16_HI,           5)
  34   RELOC_NUMBER (R_PPC64_ADDR16_HA,           6)
  35   RELOC_NUMBER (R_PPC64_ADDR14,              7)
  36   RELOC_NUMBER (R_PPC64_ADDR14_BRTAKEN,      8)
  37   RELOC_NUMBER (R_PPC64_ADDR14_BRNTAKEN,     9)
  38   RELOC_NUMBER (R_PPC64_REL24,              10)
  39   RELOC_NUMBER (R_PPC64_REL14,              11)
  40   RELOC_NUMBER (R_PPC64_REL14_BRTAKEN,      12)
  41   RELOC_NUMBER (R_PPC64_REL14_BRNTAKEN,     13)
  42   RELOC_NUMBER (R_PPC64_GOT16,              14)
  43   RELOC_NUMBER (R_PPC64_GOT16_LO,           15)
  44   RELOC_NUMBER (R_PPC64_GOT16_HI,           16)
  45   RELOC_NUMBER (R_PPC64_GOT16_HA,           17)
  46   /* 18 unused.  32-bit reloc is R_PPC_PLTREL24.  */
  47   RELOC_NUMBER (R_PPC64_COPY,               19)
  48   RELOC_NUMBER (R_PPC64_GLOB_DAT,           20)
  49   RELOC_NUMBER (R_PPC64_JMP_SLOT,           21)
  50   RELOC_NUMBER (R_PPC64_RELATIVE,           22)
  51   /* 23 unused.  32-bit reloc is R_PPC_LOCAL24PC.  */
  52   RELOC_NUMBER (R_PPC64_UADDR32,            24)
  53   RELOC_NUMBER (R_PPC64_UADDR16,            25)
  54   RELOC_NUMBER (R_PPC64_REL32,              26)
  55   RELOC_NUMBER (R_PPC64_PLT32,              27)
  56   RELOC_NUMBER (R_PPC64_PLTREL32,           28)
  57   RELOC_NUMBER (R_PPC64_PLT16_LO,           29)
  58   RELOC_NUMBER (R_PPC64_PLT16_HI,           30)
  59   RELOC_NUMBER (R_PPC64_PLT16_HA,           31)
  60   /* 32 unused.  32-bit reloc is R_PPC_SDAREL16.  */
  61   RELOC_NUMBER (R_PPC64_SECTOFF,            33)
  62   RELOC_NUMBER (R_PPC64_SECTOFF_LO,         34)
  63   RELOC_NUMBER (R_PPC64_SECTOFF_HI,         35)
  64   RELOC_NUMBER (R_PPC64_SECTOFF_HA,         36)
  65   RELOC_NUMBER (R_PPC64_REL30,              37)
  66   RELOC_NUMBER (R_PPC64_ADDR64,             38)
  67   RELOC_NUMBER (R_PPC64_ADDR16_HIGHER,      39)
  68   RELOC_NUMBER (R_PPC64_ADDR16_HIGHERA,     40)
  69   RELOC_NUMBER (R_PPC64_ADDR16_HIGHEST,     41)
  70   RELOC_NUMBER (R_PPC64_ADDR16_HIGHESTA,    42)
  71   RELOC_NUMBER (R_PPC64_UADDR64,            43)
  72   RELOC_NUMBER (R_PPC64_REL64,              44)
  73   RELOC_NUMBER (R_PPC64_PLT64,              45)
  74   RELOC_NUMBER (R_PPC64_PLTREL64,           46)
  75   RELOC_NUMBER (R_PPC64_TOC16,              47)
  76   RELOC_NUMBER (R_PPC64_TOC16_LO,           48)
  77   RELOC_NUMBER (R_PPC64_TOC16_HI,           49)
  78   RELOC_NUMBER (R_PPC64_TOC16_HA,           50)
  79   RELOC_NUMBER (R_PPC64_TOC,                51)
  80   RELOC_NUMBER (R_PPC64_PLTGOT16,           52)
  81   RELOC_NUMBER (R_PPC64_PLTGOT16_LO,        53)
  82   RELOC_NUMBER (R_PPC64_PLTGOT16_HI,        54)
  83   RELOC_NUMBER (R_PPC64_PLTGOT16_HA,        55)
  84
  85   /* The following relocs were added in the 64-bit PowerPC ELF ABI
  86      revision 1.2. */
  87   RELOC_NUMBER (R_PPC64_ADDR16_DS,          56)
  88   RELOC_NUMBER (R_PPC64_ADDR16_LO_DS,       57)
  89   RELOC_NUMBER (R_PPC64_GOT16_DS,           58)
  90   RELOC_NUMBER (R_PPC64_GOT16_LO_DS,        59)
  91   RELOC_NUMBER (R_PPC64_PLT16_LO_DS,        60)
  92   RELOC_NUMBER (R_PPC64_SECTOFF_DS,         61)
  93   RELOC_NUMBER (R_PPC64_SECTOFF_LO_DS,      62)
  94   RELOC_NUMBER (R_PPC64_TOC16_DS,           63)
  95   RELOC_NUMBER (R_PPC64_TOC16_LO_DS,        64)
  96   RELOC_NUMBER (R_PPC64_PLTGOT16_DS,        65)
  97   RELOC_NUMBER (R_PPC64_PLTGOT16_LO_DS,     66)
  98
  99   /* Relocs added to support TLS.  PowerPC64 ELF ABI revision 1.5.  */
 100   RELOC_NUMBER (R_PPC64_TLS,                67)
 101   RELOC_NUMBER (R_PPC64_DTPMOD64,           68)
 102   RELOC_NUMBER (R_PPC64_TPREL16,            69)
 103   RELOC_NUMBER (R_PPC64_TPREL16_LO,         70)
 104   RELOC_NUMBER (R_PPC64_TPREL16_HI,         71)
 105   RELOC_NUMBER (R_PPC64_TPREL16_HA,         72)
 106   RELOC_NUMBER (R_PPC64_TPREL64,            73)
 107   RELOC_NUMBER (R_PPC64_DTPREL16,           74)
 108   RELOC_NUMBER (R_PPC64_DTPREL16_LO,        75)
 109   RELOC_NUMBER (R_PPC64_DTPREL16_HI,        76)
 110   RELOC_NUMBER (R_PPC64_DTPREL16_HA,        77)
 111   RELOC_NUMBER (R_PPC64_DTPREL64,           78)
 112   RELOC_NUMBER (R_PPC64_GOT_TLSGD16,        79)
 113   RELOC_NUMBER (R_PPC64_GOT_TLSGD16_LO,     80)
 114   RELOC_NUMBER (R_PPC64_GOT_TLSGD16_HI,     81)
 115   RELOC_NUMBER (R_PPC64_GOT_TLSGD16_HA,     82)
 116   RELOC_NUMBER (R_PPC64_GOT_TLSLD16,        83)
 117   RELOC_NUMBER (R_PPC64_GOT_TLSLD16_LO,     84)
 118   RELOC_NUMBER (R_PPC64_GOT_TLSLD16_HI,     85)
 119   RELOC_NUMBER (R_PPC64_GOT_TLSLD16_HA,     86)
 120   RELOC_NUMBER (R_PPC64_GOT_TPREL16_DS,     87)
 121   RELOC_NUMBER (R_PPC64_GOT_TPREL16_LO_DS,  88)
 122   RELOC_NUMBER (R_PPC64_GOT_TPREL16_HI,     89)
 123   RELOC_NUMBER (R_PPC64_GOT_TPREL16_HA,     90)
 124   RELOC_NUMBER (R_PPC64_GOT_DTPREL16_DS,    91)
 125   RELOC_NUMBER (R_PPC64_GOT_DTPREL16_LO_DS, 92)
 126   RELOC_NUMBER (R_PPC64_GOT_DTPREL16_HI,    93)
 127   RELOC_NUMBER (R_PPC64_GOT_DTPREL16_HA,    94)
 128   RELOC_NUMBER (R_PPC64_TPREL16_DS,         95)
 129   RELOC_NUMBER (R_PPC64_TPREL16_LO_DS,      96)
 130   RELOC_NUMBER (R_PPC64_TPREL16_HIGHER,     97)
 131   RELOC_NUMBER (R_PPC64_TPREL16_HIGHERA,    98)
 132   RELOC_NUMBER (R_PPC64_TPREL16_HIGHEST,    99)
 133   RELOC_NUMBER (R_PPC64_TPREL16_HIGHESTA,  100)
 134   RELOC_NUMBER (R_PPC64_DTPREL16_DS,       101)
 135   RELOC_NUMBER (R_PPC64_DTPREL16_LO_DS,    102)
 136   RELOC_NUMBER (R_PPC64_DTPREL16_HIGHER,   103)
 137   RELOC_NUMBER (R_PPC64_DTPREL16_HIGHERA,  104)
 138   RELOC_NUMBER (R_PPC64_DTPREL16_HIGHEST,  105)
 139   RELOC_NUMBER (R_PPC64_DTPREL16_HIGHESTA, 106)
 140   RELOC_NUMBER (R_PPC64_TLSGD,             107)
 141   RELOC_NUMBER (R_PPC64_TLSLD,             108)
 142   RELOC_NUMBER (R_PPC64_TOCSAVE,           109)
 143
 144 /* Added when HA and HI relocs were changed to report overflows.  */
 145   RELOC_NUMBER (R_PPC64_ADDR16_HIGH,       110)
 146   RELOC_NUMBER (R_PPC64_ADDR16_HIGHA,      111)
 147   RELOC_NUMBER (R_PPC64_TPREL16_HIGH,      112)
 148   RELOC_NUMBER (R_PPC64_TPREL16_HIGHA,     113)
 149   RELOC_NUMBER (R_PPC64_DTPREL16_HIGH,     114)
 150   RELOC_NUMBER (R_PPC64_DTPREL16_HIGHA,    115)
 151
 152 #ifndef RELOC_MACROS_GEN_FUNC
 153 /* Fake relocation only used internally by ld.  */
 154   RELOC_NUMBER (R_PPC64_LO_DS_OPT,         128)
 155 #endif
 156 /* Support STT_GNU_IFUNC plt calls.  */
 157   RELOC_NUMBER (R_PPC64_JMP_IREL,          247)
 158   RELOC_NUMBER (R_PPC64_IRELATIVE,         248)
 159
 160 /* These are GNU extensions used in PIC code sequences.  */
 161   RELOC_NUMBER (R_PPC64_REL16,             249)
 162   RELOC_NUMBER (R_PPC64_REL16_LO,          250)
 163   RELOC_NUMBER (R_PPC64_REL16_HI,          251)
 164   RELOC_NUMBER (R_PPC64_REL16_HA,          252)
 165
 166   /* These are GNU extensions to enable C++ vtable garbage collection.  */
 167   RELOC_NUMBER (R_PPC64_GNU_VTINHERIT,     253)
 168   RELOC_NUMBER (R_PPC64_GNU_VTENTRY,       254)
 169
 170 END_RELOC_NUMBERS (R_PPC64_max)
 171
 172 #define IS_PPC64_TLS_RELOC(R)                                           \
 173   (((R) >= R_PPC64_TLS && (R) <= R_PPC64_DTPREL16_HIGHESTA)             \
 174    || ((R) >= R_PPC64_TPREL16_HIGH && (R) <= R_PPC64_DTPREL16_HIGHA))
 175
 176
 177 /* e_flags bits specifying ABI.
 178    1 for original function descriptor using ABI,
 179    2 for revised ABI without function descriptors,
 180    0 for unspecified or not using any features affected by the differences.  */
 181 #define EF_PPC64_ABI    3
 182
 183 /* The ELFv2 ABI uses three bits in the symbol st_other field of a
 184    function definition to specify the number of instructions between a
 185    function's global entry point and local entry point.
 186    The global entry point is used when it is necessary to set up the
 187    toc pointer (r2) for the function.  Callers must enter the global
 188    entry point with r12 set to the global entry point address.  On
 189    return from the function, r2 may have a different value to that
 190    which it had on entry.
 191    The local entry point is used when r2 is known to already be valid
 192    for the function.  There is no requirement on r12 when using the
 193    local entry point, and on return r2 will contain the same value as
 194    at entry.
 195    A value of zero in these bits means that the function has a single
 196    entry point with no requirement on r12 or r2, and that on return r2
 197    will contain the same value as at entry.
 198    Values of one and seven are reserved.  */
 199 #define STO_PPC64_LOCAL_BIT             5
 200 #define STO_PPC64_LOCAL_MASK            (7 << STO_PPC64_LOCAL_BIT)
 201
 202 // 3 bit other field to bytes.
 203 static inline unsigned int
 204 ppc64_decode_local_entry(unsigned int other)
 205 {
 206   return ((1 << other) >> 2) << 2;
 207 }
 208
 209 // bytes to field value.
 210 static inline unsigned int
 211 ppc64_encode_local_entry(unsigned int val)
 212 {
 213   return (val >= 4 * 4
 214           ? (val >= 8 * 4
 215              ? (val >= 16 * 4 ? 6 : 5)
 216              : 4)
 217           : (val >= 2 * 4
 218              ? 3
 219              : (val >= 1 * 4 ? 2 : 0)));
 220 }
 221
 222 /* st_other to number of bytes.  */
 223 #define PPC64_LOCAL_ENTRY_OFFSET(other)                         \
 224   ppc64_decode_local_entry (((other) & STO_PPC64_LOCAL_MASK)    \
 225                             >> STO_PPC64_LOCAL_BIT)
 226 /* number of bytes to st_other.  */
 227 #define PPC64_SET_LOCAL_ENTRY_OFFSET(val)               \
 228   ppc64_encode_local_entry (val) << STO_PPC64_LOCAL_BIT
 229
 230 /* Specify the start of the .glink section.  */
 231 #define DT_PPC64_GLINK          DT_LOPROC
 232
 233 /* Specify the start and size of the .opd section.  */
 234 #define DT_PPC64_OPD            (DT_LOPROC + 1)
 235 #define DT_PPC64_OPDSZ          (DT_LOPROC + 2)
 236
 237 /* Specify that tls descriptors should be optimized.  */
 238 #define DT_PPC64_TLSOPT         (DT_LOPROC + 3)
 239
 240 #endif /* _ELF_PPC64_H */