| 1 | /* Freescale S12Z-specific support for 32-bit ELF |
| 2 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
| 3 | (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com)) |
| 4 | |
| 5 | This file is part of BFD, the Binary File Descriptor library. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program; if not, write to the Free Software |
| 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 20 | MA 02110-1301, USA. */ |
| 21 | |
| 22 | #include "sysdep.h" |
| 23 | #include "bfd.h" |
| 24 | #include "bfdlink.h" |
| 25 | #include "libbfd.h" |
| 26 | #include "elf-bfd.h" |
| 27 | |
| 28 | #include "elf/s12z.h" |
| 29 | |
| 30 | /* Relocation functions. */ |
| 31 | static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup |
| 32 | (bfd *, bfd_reloc_code_real_type); |
| 33 | static bfd_boolean s12z_info_to_howto_rel |
| 34 | (bfd *, arelent *, Elf_Internal_Rela *); |
| 35 | |
| 36 | static bfd_reloc_status_type |
| 37 | opru18_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol, |
| 38 | void *data, asection *input_section ATTRIBUTE_UNUSED, |
| 39 | bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED) |
| 40 | { |
| 41 | /* This reloc is used for 18 bit General Operand Addressing Postbyte in the |
| 42 | INST opru18 form. This is an 18 bit reloc, but the most significant bit |
| 43 | is shifted one place to the left of where it would normally be. See |
| 44 | Appendix A.4 of the S12Z reference manual. */ |
| 45 | |
| 46 | bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd); |
| 47 | bfd_vma result = bfd_get_24 (abfd, (unsigned char *) data + octets); |
| 48 | bfd_vma val = bfd_asymbol_value (symbol); |
| 49 | |
| 50 | /* Keep the wanted bits and discard the rest. */ |
| 51 | result &= 0xFA0000; |
| 52 | |
| 53 | val += symbol->section->output_section->vma; |
| 54 | val += symbol->section->output_offset; |
| 55 | |
| 56 | /* The lowest 17 bits are copied verbatim. */ |
| 57 | result |= val & 0x1FFFF; |
| 58 | |
| 59 | /* The 18th bit is put into the 19th position. */ |
| 60 | result |= (val & 0x020000) << 1; |
| 61 | |
| 62 | bfd_put_24 (abfd, result, (unsigned char *) data + octets); |
| 63 | |
| 64 | return bfd_reloc_ok; |
| 65 | } |
| 66 | |
| 67 | |
| 68 | static bfd_reloc_status_type |
| 69 | shift_addend_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol ATTRIBUTE_UNUSED, |
| 70 | void *data ATTRIBUTE_UNUSED, asection *input_section ATTRIBUTE_UNUSED, |
| 71 | bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED) |
| 72 | { |
| 73 | /* This is a really peculiar reloc, which is done for compatibility |
| 74 | with the Freescale toolchain. |
| 75 | |
| 76 | That toolchain appears to (ab)use the lowest 15 bits of the addend for |
| 77 | the purpose of holding flags. The purpose of these flags are unknown. |
| 78 | So in this function, when writing the bfd we left shift the addend by |
| 79 | 15, and when reading we right shift it by 15 (discarding the lower bits). |
| 80 | |
| 81 | This allows the linker to work with object files generated by Freescale, |
| 82 | as well as by Gas. */ |
| 83 | |
| 84 | if (abfd->is_linker_input) |
| 85 | reloc_entry->addend >>= 15; |
| 86 | else |
| 87 | reloc_entry->addend <<= 15; |
| 88 | |
| 89 | return bfd_reloc_continue; |
| 90 | } |
| 91 | |
| 92 | #define USE_REL 0 |
| 93 | |
| 94 | static reloc_howto_type elf_s12z_howto_table[] = |
| 95 | { |
| 96 | /* This reloc does nothing. */ |
| 97 | HOWTO (R_S12Z_NONE, /* type */ |
| 98 | 0, /* rightshift */ |
| 99 | 3, /* size (0 = byte, 1 = short, 2 = long) */ |
| 100 | 0, /* bitsize */ |
| 101 | FALSE, /* pc_relative */ |
| 102 | 0, /* bitpos */ |
| 103 | complain_overflow_dont,/* complain_on_overflow */ |
| 104 | bfd_elf_generic_reloc, /* special_function */ |
| 105 | "R_S12Z_NONE", /* name */ |
| 106 | FALSE, /* partial_inplace */ |
| 107 | 0, /* src_mask */ |
| 108 | 0, /* dst_mask */ |
| 109 | FALSE), /* pcrel_offset */ |
| 110 | |
| 111 | /* A 24 bit absolute relocation emitted by the OPR mode operands */ |
| 112 | HOWTO (R_S12Z_OPR, /* type */ |
| 113 | 0, /* rightshift */ |
| 114 | 5, /* size (0 = byte, 1 = short, 2 = long) */ |
| 115 | 24, /* bitsize */ |
| 116 | FALSE, /* pc_relative */ |
| 117 | 0, /* bitpos */ |
| 118 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 119 | shift_addend_reloc, |
| 120 | "R_S12Z_OPR", /* name */ |
| 121 | FALSE, /* partial_inplace */ |
| 122 | 0x00ffffff, /* src_mask */ |
| 123 | 0x00ffffff, /* dst_mask */ |
| 124 | FALSE), /* pcrel_offset */ |
| 125 | |
| 126 | /* The purpose of this reloc is not known */ |
| 127 | HOWTO (R_S12Z_UKNWN_2, /* type */ |
| 128 | 0, /* rightshift */ |
| 129 | 3, /* size (0 = byte, 1 = short, 2 = long) */ |
| 130 | 0, /* bitsize */ |
| 131 | FALSE, /* pc_relative */ |
| 132 | 0, /* bitpos */ |
| 133 | complain_overflow_dont,/* complain_on_overflow */ |
| 134 | bfd_elf_generic_reloc, /* special_function */ |
| 135 | "R_S12Z_UKNWN_2", /* name */ |
| 136 | FALSE, /* partial_inplace */ |
| 137 | 0, /* src_mask */ |
| 138 | 0, /* dst_mask */ |
| 139 | FALSE), /* pcrel_offset */ |
| 140 | |
| 141 | /* A 15 bit PC-rel relocation */ |
| 142 | HOWTO (R_S12Z_PCREL_7_15, /* type */ |
| 143 | 0, /* rightshift */ |
| 144 | 1, /* size (0 = byte, 1 = short, 2 = long) */ |
| 145 | 15, /* bitsize */ |
| 146 | TRUE, /* pc_relative */ |
| 147 | 0, /* bitpos */ |
| 148 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 149 | shift_addend_reloc, |
| 150 | "R_S12Z_PCREL_7_15", /* name */ |
| 151 | FALSE, /* partial_inplace */ |
| 152 | 0x00, /* src_mask */ |
| 153 | 0x007fff, /* dst_mask */ |
| 154 | TRUE), /* pcrel_offset */ |
| 155 | |
| 156 | /* A 24 bit absolute relocation emitted by EXT24 mode operands */ |
| 157 | HOWTO (R_S12Z_EXT24, /* type */ |
| 158 | 0, /* rightshift */ |
| 159 | 5, /* size (0 = byte, 1 = short, 2 = long) */ |
| 160 | 24, /* bitsize */ |
| 161 | FALSE, /* pc_relative */ |
| 162 | 0, /* bitpos */ |
| 163 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 164 | bfd_elf_generic_reloc, /* special_function */ |
| 165 | "R_S12Z_EXT24", /* name */ |
| 166 | FALSE, /* partial_inplace */ |
| 167 | 0x00000000, /* src_mask */ |
| 168 | 0x00ffffff, /* dst_mask */ |
| 169 | FALSE), /* pcrel_offset */ |
| 170 | |
| 171 | /* An 18 bit absolute relocation */ |
| 172 | HOWTO (R_S12Z_EXT18, /* type */ |
| 173 | 0, /* rightshift */ |
| 174 | 5, /* size (0 = byte, 1 = short, 2 = long) */ |
| 175 | 18, /* bitsize */ |
| 176 | FALSE, /* pc_relative */ |
| 177 | 0, /* bitpos */ |
| 178 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 179 | opru18_reloc, /* special_function */ |
| 180 | "R_S12Z_EXT18", /* name */ |
| 181 | FALSE, /* partial_inplace */ |
| 182 | 0x00000000, /* src_mask */ |
| 183 | 0x0005ffff, /* dst_mask */ |
| 184 | FALSE), /* pcrel_offset */ |
| 185 | |
| 186 | /* A 32 bit absolute relocation. This kind of relocation is |
| 187 | schizophrenic - Although they appear in sections named .rela.debug.* |
| 188 | in some sections they behave as RELA relocs, but in others they have |
| 189 | an added of zero and behave as REL. |
| 190 | |
| 191 | It is not recommended that new code emits this reloc. It is here |
| 192 | only to support existing elf files generated by third party |
| 193 | applications. */ |
| 194 | |
| 195 | HOWTO (R_S12Z_CW32, /* type */ |
| 196 | 0, /* rightshift */ |
| 197 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 198 | 32, /* bitsize */ |
| 199 | FALSE, /* pc_relative */ |
| 200 | 0, /* bitpos */ |
| 201 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 202 | bfd_elf_generic_reloc, /* special_function */ |
| 203 | "R_S12Z_CW32", /* name */ |
| 204 | FALSE, /* partial_inplace */ |
| 205 | 0xffffffff, /* src_mask */ |
| 206 | 0xffffffff, /* dst_mask */ |
| 207 | FALSE), /* pcrel_offset */ |
| 208 | |
| 209 | /* A 32 bit absolute relocation */ |
| 210 | HOWTO (R_S12Z_EXT32, /* type */ |
| 211 | 0, /* rightshift */ |
| 212 | 2, /* size (0 = byte, 1 = short, 2 = long) */ |
| 213 | 32, /* bitsize */ |
| 214 | FALSE, /* pc_relative */ |
| 215 | 0, /* bitpos */ |
| 216 | complain_overflow_bitfield, /* complain_on_overflow */ |
| 217 | bfd_elf_generic_reloc, /* special_function */ |
| 218 | "R_S12Z_EXT32", /* name */ |
| 219 | FALSE, /* partial_inplace */ |
| 220 | 0x00000000, /* src_mask */ |
| 221 | 0xffffffff, /* dst_mask */ |
| 222 | FALSE), /* pcrel_offset */ |
| 223 | }; |
| 224 | |
| 225 | /* Map BFD reloc types to S12Z ELF reloc types. */ |
| 226 | |
| 227 | struct s12z_reloc_map |
| 228 | { |
| 229 | bfd_reloc_code_real_type bfd_reloc_val; |
| 230 | unsigned char elf_reloc_val; |
| 231 | }; |
| 232 | |
| 233 | static const struct s12z_reloc_map s12z_reloc_map[] = |
| 234 | { |
| 235 | /* bfd reloc val */ /* elf reloc val */ |
| 236 | {BFD_RELOC_NONE, R_S12Z_NONE}, |
| 237 | {BFD_RELOC_32, R_S12Z_EXT32}, |
| 238 | {BFD_RELOC_24, R_S12Z_EXT24}, |
| 239 | {BFD_RELOC_16_PCREL, R_S12Z_PCREL_7_15}, |
| 240 | {BFD_RELOC_S12Z_OPR, R_S12Z_OPR} |
| 241 | }; |
| 242 | |
| 243 | static reloc_howto_type * |
| 244 | bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 245 | bfd_reloc_code_real_type code) |
| 246 | { |
| 247 | unsigned int i; |
| 248 | |
| 249 | for (i = 0; |
| 250 | i < sizeof (s12z_reloc_map) / sizeof (struct s12z_reloc_map); |
| 251 | i++) |
| 252 | { |
| 253 | if (s12z_reloc_map[i].bfd_reloc_val == code) |
| 254 | { |
| 255 | return &elf_s12z_howto_table[s12z_reloc_map[i].elf_reloc_val]; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | printf ("%s:%d Not found type %d\n", __FILE__, __LINE__, code); |
| 260 | |
| 261 | return NULL; |
| 262 | } |
| 263 | |
| 264 | static reloc_howto_type * |
| 265 | bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
| 266 | const char *r_name) |
| 267 | { |
| 268 | unsigned int i; |
| 269 | |
| 270 | for (i = 0; |
| 271 | i < (sizeof (elf_s12z_howto_table) |
| 272 | / sizeof (elf_s12z_howto_table[0])); |
| 273 | i++) |
| 274 | if (elf_s12z_howto_table[i].name != NULL |
| 275 | && strcasecmp (elf_s12z_howto_table[i].name, r_name) == 0) |
| 276 | return &elf_s12z_howto_table[i]; |
| 277 | |
| 278 | return NULL; |
| 279 | } |
| 280 | |
| 281 | /* Set the howto pointer for an S12Z ELF reloc. */ |
| 282 | |
| 283 | static bfd_boolean |
| 284 | s12z_info_to_howto_rel (bfd *abfd, |
| 285 | arelent *cache_ptr, Elf_Internal_Rela *dst) |
| 286 | { |
| 287 | unsigned int r_type = ELF32_R_TYPE (dst->r_info); |
| 288 | |
| 289 | if (r_type >= (unsigned int) R_S12Z_max) |
| 290 | { |
| 291 | /* xgettext:c-format */ |
| 292 | _bfd_error_handler (_("%pB: unsupported relocation type %#x"), |
| 293 | abfd, r_type); |
| 294 | bfd_set_error (bfd_error_bad_value); |
| 295 | return FALSE; |
| 296 | } |
| 297 | |
| 298 | cache_ptr->howto = &elf_s12z_howto_table[r_type]; |
| 299 | return TRUE; |
| 300 | } |
| 301 | |
| 302 | static bfd_boolean |
| 303 | s12z_elf_set_mach_from_flags (bfd *abfd) |
| 304 | { |
| 305 | bfd_default_set_arch_mach (abfd, bfd_arch_s12z, 0); |
| 306 | |
| 307 | return TRUE; |
| 308 | } |
| 309 | |
| 310 | #define ELF_ARCH bfd_arch_s12z |
| 311 | #define ELF_MACHINE_CODE EM_S12Z |
| 312 | #define ELF_MAXPAGESIZE 0x1000 |
| 313 | |
| 314 | #define TARGET_BIG_SYM s12z_elf32_vec |
| 315 | #define TARGET_BIG_NAME "elf32-s12z" |
| 316 | |
| 317 | #define elf_info_to_howto NULL |
| 318 | #define elf_info_to_howto_rel s12z_info_to_howto_rel |
| 319 | #define elf_backend_object_p s12z_elf_set_mach_from_flags |
| 320 | #define elf_backend_final_write_processing NULL |
| 321 | |
| 322 | #include "elf32-target.h" |