include/elf/ppc64.h

   1 /* PPC64 ELF support for BFD.
   2    Copyright (C) 2003-2017 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 /* Added for ELFv2.  */
 153   RELOC_NUMBER (R_PPC64_REL24_NOTOC,       116)
 154   RELOC_NUMBER (R_PPC64_ADDR64_LOCAL,      117)
 155   RELOC_NUMBER (R_PPC64_ENTRY,             118)
 156
 157 #ifndef RELOC_MACROS_GEN_FUNC
 158 /* Relocation only used internally by ld.  If you need to use these
 159    reloc numbers, you can change them to some other unused value
 160    without affecting the ABI.  They will never appear in object files.  */
 161   RELOC_NUMBER (R_PPC64_LO_DS_OPT,         128)
 162 /* Reloc only used internally by gas.  As above, value is unimportant.  */
 163   RELOC_NUMBER (R_PPC64_16DX_HA,           129)
 164 #endif
 165
 166 /* Power9 split rel16 for addpcis.  */
 167   RELOC_NUMBER (R_PPC64_REL16DX_HA,        246)
 168
 169 /* Support STT_GNU_IFUNC plt calls.  */
 170   RELOC_NUMBER (R_PPC64_JMP_IREL,          247)
 171   RELOC_NUMBER (R_PPC64_IRELATIVE,         248)
 172
 173 /* These are GNU extensions used in PIC code sequences.  */
 174   RELOC_NUMBER (R_PPC64_REL16,             249)
 175   RELOC_NUMBER (R_PPC64_REL16_LO,          250)
 176   RELOC_NUMBER (R_PPC64_REL16_HI,          251)
 177   RELOC_NUMBER (R_PPC64_REL16_HA,          252)
 178
 179   /* These are GNU extensions to enable C++ vtable garbage collection.  */
 180   RELOC_NUMBER (R_PPC64_GNU_VTINHERIT,     253)
 181   RELOC_NUMBER (R_PPC64_GNU_VTENTRY,       254)
 182
 183 END_RELOC_NUMBERS (R_PPC64_max)
 184
 185 #define IS_PPC64_TLS_RELOC(R)                                           \
 186   (((R) >= R_PPC64_TLS && (R) <= R_PPC64_DTPREL16_HIGHESTA)             \
 187    || ((R) >= R_PPC64_TPREL16_HIGH && (R) <= R_PPC64_DTPREL16_HIGHA))
 188
 189
 190 /* e_flags bits specifying ABI.
 191    1 for original function descriptor using ABI,
 192    2 for revised ABI without function descriptors,
 193    0 for unspecified or not using any features affected by the differences.  */
 194 #define EF_PPC64_ABI    3
 195
 196 /* The ELFv2 ABI uses three bits in the symbol st_other field of a
 197    function definition to specify the number of instructions between a
 198    function's global entry point and local entry point.
 199    The global entry point is used when it is necessary to set up the
 200    toc pointer (r2) for the function.  Callers must enter the global
 201    entry point with r12 set to the global entry point address.  On
 202    return from the function, r2 may have a different value to that
 203    which it had on entry.
 204    The local entry point is used when r2 is known to already be valid
 205    for the function.  There is no requirement on r12 when using the
 206    local entry point, and on return r2 will contain the same value as
 207    at entry.
 208    A value of zero in these bits means that the function has a single
 209    entry point with no requirement on r12 or r2, and that on return r2
 210    will contain the same value as at entry.
 211    Values of one and seven are reserved.  */
 212 #define STO_PPC64_LOCAL_BIT             5
 213 #define STO_PPC64_LOCAL_MASK            (7 << STO_PPC64_LOCAL_BIT)
 214
 215 // 3 bit other field to bytes.
 216 static inline unsigned int
 217 ppc64_decode_local_entry(unsigned int other)
 218 {
 219   return ((1 << other) >> 2) << 2;
 220 }
 221
 222 // bytes to field value.
 223 static inline unsigned int
 224 ppc64_encode_local_entry(unsigned int val)
 225 {
 226   return (val >= 4 * 4
 227           ? (val >= 8 * 4
 228              ? (val >= 16 * 4 ? 6 : 5)
 229              : 4)
 230           : (val >= 2 * 4
 231              ? 3
 232              : (val >= 1 * 4 ? 2 : 0)));
 233 }
 234
 235 /* st_other to number of bytes.  */
 236 #define PPC64_LOCAL_ENTRY_OFFSET(other)                         \
 237   ppc64_decode_local_entry (((other) & STO_PPC64_LOCAL_MASK)    \
 238                             >> STO_PPC64_LOCAL_BIT)
 239 /* number of bytes to st_other.  */
 240 #define PPC64_SET_LOCAL_ENTRY_OFFSET(val)               \
 241   ppc64_encode_local_entry (val) << STO_PPC64_LOCAL_BIT
 242
 243 /* Specify the start of the .glink section.  */
 244 #define DT_PPC64_GLINK          DT_LOPROC
 245
 246 /* Specify the start and size of the .opd section.  */
 247 #define DT_PPC64_OPD            (DT_LOPROC + 1)
 248 #define DT_PPC64_OPDSZ          (DT_LOPROC + 2)
 249
 250 /* Specify whether various optimisations are possible.  */
 251 #define DT_PPC64_OPT            (DT_LOPROC + 3)
 252 #define PPC64_OPT_TLS           1
 253 #define PPC64_OPT_MULTI_TOC     2
 254 #define PPC64_OPT_LOCALENTRY    4
 255
 256 #endif /* _ELF_PPC64_H */