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580 lines
20 KiB
580 lines
20 KiB
/* DLX specific support for 32-bit ELF |
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Copyright (C) 2002-2014 Free Software Foundation, Inc. |
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This file is part of BFD, the Binary File Descriptor library. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
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MA 02110-1301, USA. */ |
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|
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#include "sysdep.h" |
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#include "bfd.h" |
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#include "libbfd.h" |
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#include "elf-bfd.h" |
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#include "elf/dlx.h" |
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#define USE_REL 1 |
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#define bfd_elf32_bfd_reloc_type_lookup elf32_dlx_reloc_type_lookup |
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#define bfd_elf32_bfd_reloc_name_lookup elf32_dlx_reloc_name_lookup |
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#define elf_info_to_howto elf32_dlx_info_to_howto |
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#define elf_info_to_howto_rel elf32_dlx_info_to_howto_rel |
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#define elf_backend_check_relocs elf32_dlx_check_relocs |
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/* The gas default behavior is not to preform the %hi modifier so that the |
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GNU assembler can have the lower 16 bits offset placed in the insn, BUT |
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we do like the gas to indicate it is %hi reloc type so when we in the link |
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loader phase we can have the corrected hi16 vale replace the buggous lo16 |
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value that was placed there by gas. */ |
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static int skip_dlx_elf_hi16_reloc = 0; |
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extern int set_dlx_skip_hi16_flag (int); |
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int |
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set_dlx_skip_hi16_flag (int flag) |
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{ |
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skip_dlx_elf_hi16_reloc = flag; |
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return flag; |
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} |
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static bfd_reloc_status_type |
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_bfd_dlx_elf_hi16_reloc (bfd *abfd, |
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arelent *reloc_entry, |
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asymbol *symbol, |
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void * data, |
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asection *input_section, |
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bfd *output_bfd, |
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char **error_message) |
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{ |
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bfd_reloc_status_type ret; |
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bfd_vma relocation; |
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/* If the skip flag is set then we simply do the generic relocating, this |
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is more of a hack for dlx gas/gld, so we do not need to do the %hi/%lo |
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fixup like mips gld did. */ |
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if (skip_dlx_elf_hi16_reloc) |
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return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
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input_section, output_bfd, error_message); |
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/* If we're relocating, and this an external symbol, we don't want |
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to change anything. */ |
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if (output_bfd != (bfd *) NULL |
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&& (symbol->flags & BSF_SECTION_SYM) == 0 |
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&& reloc_entry->addend == 0) |
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{ |
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reloc_entry->address += input_section->output_offset; |
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return bfd_reloc_ok; |
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} |
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ret = bfd_reloc_ok; |
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if (bfd_is_und_section (symbol->section) |
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&& output_bfd == (bfd *) NULL) |
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ret = bfd_reloc_undefined; |
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relocation = (bfd_is_com_section (symbol->section)) ? 0 : symbol->value; |
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relocation += symbol->section->output_section->vma; |
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relocation += symbol->section->output_offset; |
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relocation += reloc_entry->addend; |
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relocation += bfd_get_16 (abfd, (bfd_byte *)data + reloc_entry->address); |
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if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) |
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return bfd_reloc_outofrange; |
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bfd_put_16 (abfd, (short)((relocation >> 16) & 0xFFFF), |
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(bfd_byte *)data + reloc_entry->address); |
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return ret; |
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} |
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/* ELF relocs are against symbols. If we are producing relocatable |
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output, and the reloc is against an external symbol, and nothing |
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has given us any additional addend, the resulting reloc will also |
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be against the same symbol. In such a case, we don't want to |
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change anything about the way the reloc is handled, since it will |
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all be done at final link time. Rather than put special case code |
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into bfd_perform_relocation, all the reloc types use this howto |
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function. It just short circuits the reloc if producing |
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relocatable output against an external symbol. */ |
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static bfd_reloc_status_type |
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elf32_dlx_relocate16 (bfd *abfd, |
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arelent *reloc_entry, |
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asymbol *symbol, |
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void * data, |
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asection *input_section, |
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bfd *output_bfd, |
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char **error_message ATTRIBUTE_UNUSED) |
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{ |
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unsigned long insn, vallo, allignment; |
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int val; |
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/* HACK: I think this first condition is necessary when producing |
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relocatable output. After the end of HACK, the code is identical |
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to bfd_elf_generic_reloc(). I would _guess_ the first change |
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belongs there rather than here. martindo 1998-10-23. */ |
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if (skip_dlx_elf_hi16_reloc) |
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return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
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input_section, output_bfd, error_message); |
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/* Check undefined section and undefined symbols. */ |
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if (bfd_is_und_section (symbol->section) |
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&& output_bfd == (bfd *) NULL) |
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return bfd_reloc_undefined; |
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/* Can not support a long jump to sections other then .text. */ |
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if (strcmp (input_section->name, symbol->section->output_section->name) != 0) |
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{ |
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(*_bfd_error_handler) (_("BFD Link Error: branch (PC rel16) to section (%s) not supported"), |
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symbol->section->output_section->name); |
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return bfd_reloc_undefined; |
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} |
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insn = bfd_get_32 (abfd, (bfd_byte *)data + reloc_entry->address); |
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allignment = 1 << (input_section->output_section->alignment_power - 1); |
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vallo = insn & 0x0000FFFF; |
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if (vallo & 0x8000) |
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vallo = ~(vallo | 0xFFFF0000) + 1; |
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/* vallo points to the vma of next instruction. */ |
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vallo += (((unsigned long)(input_section->output_section->vma + |
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input_section->output_offset) + |
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allignment) & ~allignment); |
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/* val is the displacement (PC relative to next instruction). */ |
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val = (symbol->section->output_offset + |
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symbol->section->output_section->vma + |
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symbol->value) - vallo; |
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if (abs ((int) val) > 0x00007FFF) |
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return bfd_reloc_outofrange; |
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insn = (insn & 0xFFFF0000) | (val & 0x0000FFFF); |
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bfd_put_32 (abfd, insn, |
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(bfd_byte *) data + reloc_entry->address); |
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return bfd_reloc_ok; |
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} |
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static bfd_reloc_status_type |
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elf32_dlx_relocate26 (bfd *abfd, |
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arelent *reloc_entry, |
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asymbol *symbol, |
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void * data, |
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asection *input_section, |
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bfd *output_bfd, |
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char **error_message ATTRIBUTE_UNUSED) |
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{ |
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unsigned long insn, vallo, allignment; |
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int val; |
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/* HACK: I think this first condition is necessary when producing |
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relocatable output. After the end of HACK, the code is identical |
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to bfd_elf_generic_reloc(). I would _guess_ the first change |
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belongs there rather than here. martindo 1998-10-23. */ |
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if (skip_dlx_elf_hi16_reloc) |
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return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
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input_section, output_bfd, error_message); |
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/* Check undefined section and undefined symbols. */ |
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if (bfd_is_und_section (symbol->section) |
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&& output_bfd == (bfd *) NULL) |
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return bfd_reloc_undefined; |
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/* Can not support a long jump to sections other then .text */ |
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if (strcmp (input_section->name, symbol->section->output_section->name) != 0) |
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{ |
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(*_bfd_error_handler) (_("BFD Link Error: jump (PC rel26) to section (%s) not supported"), |
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symbol->section->output_section->name); |
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return bfd_reloc_undefined; |
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} |
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insn = bfd_get_32 (abfd, (bfd_byte *)data + reloc_entry->address); |
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allignment = 1 << (input_section->output_section->alignment_power - 1); |
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vallo = insn & 0x03FFFFFF; |
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if (vallo & 0x03000000) |
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vallo = ~(vallo | 0xFC000000) + 1; |
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/* vallo is the vma for the next instruction. */ |
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vallo += (((unsigned long) (input_section->output_section->vma + |
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input_section->output_offset) + |
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allignment) & ~allignment); |
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/* val is the displacement (PC relative to next instruction). */ |
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val = (symbol->section->output_offset + |
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symbol->section->output_section->vma + symbol->value) |
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- vallo; |
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if (abs ((int) val) > 0x01FFFFFF) |
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return bfd_reloc_outofrange; |
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insn = (insn & 0xFC000000) | (val & 0x03FFFFFF); |
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bfd_put_32 (abfd, insn, |
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(bfd_byte *) data + reloc_entry->address); |
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return bfd_reloc_ok; |
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} |
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static reloc_howto_type dlx_elf_howto_table[]= |
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{ |
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/* No relocation. */ |
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HOWTO (R_DLX_NONE, /* Type. */ |
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0, /* Rightshift. */ |
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0, /* size (0 = byte, 1 = short, 2 = long). */ |
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0, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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bfd_elf_generic_reloc, /* Special_function. */ |
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"R_DLX_NONE", /* Name. */ |
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FALSE, /* Partial_inplace. */ |
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0, /* Src_mask. */ |
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0, /* Dst_mask. */ |
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FALSE), /* PCrel_offset. */ |
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/* 8 bit relocation. */ |
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HOWTO (R_DLX_RELOC_8, /* Type. */ |
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0, /* Rightshift. */ |
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0, /* Size (0 = byte, 1 = short, 2 = long). */ |
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8, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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bfd_elf_generic_reloc, /* Special_function. */ |
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"R_DLX_RELOC_8", /* Name. */ |
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TRUE, /* Partial_inplace. */ |
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0xff, /* Src_mask. */ |
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0xff, /* Dst_mask. */ |
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FALSE), /* PCrel_offset. */ |
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/* 16 bit relocation. */ |
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HOWTO (R_DLX_RELOC_16, /* Type. */ |
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0, /* Rightshift. */ |
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1, /* Size (0 = byte, 1 = short, 2 = long). */ |
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16, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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bfd_elf_generic_reloc, /* Special_function. */ |
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"R_DLX_RELOC_16", /* Name. */ |
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TRUE, /* Partial_inplace. */ |
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0xffff, /* Src_mask. */ |
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0xffff, /* Dst_mask. */ |
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FALSE), /* PCrel_offset. */ |
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/* 32 bit relocation. */ |
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HOWTO (R_DLX_RELOC_32, /* Type. */ |
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0, /* Rightshift. */ |
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2, /* Size (0 = byte, 1 = short, 2 = long). */ |
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32, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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bfd_elf_generic_reloc, /* Special_function. */ |
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"R_DLX_RELOC_32", /* Name. */ |
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TRUE, /* Partial_inplace. */ |
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0xffffffff, /* Src_mask. */ |
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0xffffffff, /* Dst_mask. */ |
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FALSE), /* PCrel_offset. */ |
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/* GNU extension to record C++ vtable hierarchy. */ |
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HOWTO (R_DLX_GNU_VTINHERIT, /* Type. */ |
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0, /* Rightshift. */ |
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2, /* Size (0 = byte, 1 = short, 2 = long). */ |
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0, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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NULL, /* Special_function. */ |
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"R_DLX_GNU_VTINHERIT", /* Name. */ |
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FALSE, /* Partial_inplace. */ |
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0, /* Src_mask. */ |
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0, /* Dst_mask. */ |
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FALSE), /* PCrel_offset. */ |
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/* GNU extension to record C++ vtable member usage. */ |
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HOWTO (R_DLX_GNU_VTENTRY, /* Type. */ |
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0, /* Rightshift. */ |
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2, /* Size (0 = byte, 1 = short, 2 = long). */ |
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0, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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_bfd_elf_rel_vtable_reloc_fn,/* Special_function. */ |
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"R_DLX_GNU_VTENTRY", /* Name. */ |
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FALSE, /* Partial_inplace. */ |
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0, /* Src_mask. */ |
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0, /* Dst_mask. */ |
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FALSE) /* PCrel_offset. */ |
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}; |
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|
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/* 16 bit offset for pc-relative branches. */ |
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static reloc_howto_type elf_dlx_gnu_rel16_s2 = |
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HOWTO (R_DLX_RELOC_16_PCREL, /* Type. */ |
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0, /* Rightshift. */ |
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1, /* Size (0 = byte, 1 = short, 2 = long). */ |
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16, /* Bitsize. */ |
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TRUE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_signed, /* Complain_on_overflow. */ |
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elf32_dlx_relocate16, /* Special_function. */ |
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"R_DLX_RELOC_16_PCREL",/* Name. */ |
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TRUE, /* Partial_inplace. */ |
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0xffff, /* Src_mask. */ |
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0xffff, /* Dst_mask. */ |
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TRUE); /* PCrel_offset. */ |
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|
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/* 26 bit offset for pc-relative branches. */ |
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static reloc_howto_type elf_dlx_gnu_rel26_s2 = |
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HOWTO (R_DLX_RELOC_26_PCREL, /* Type. */ |
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0, /* Rightshift. */ |
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2, /* Size (0 = byte, 1 = short, 2 = long). */ |
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26, /* Bitsize. */ |
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TRUE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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elf32_dlx_relocate26, /* Special_function. */ |
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"R_DLX_RELOC_26_PCREL",/* Name. */ |
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TRUE, /* Partial_inplace. */ |
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0xffff, /* Src_mask. */ |
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0xffff, /* Dst_mask. */ |
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TRUE); /* PCrel_offset. */ |
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|
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/* High 16 bits of symbol value. */ |
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static reloc_howto_type elf_dlx_reloc_16_hi = |
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HOWTO (R_DLX_RELOC_16_HI, /* Type. */ |
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16, /* Rightshift. */ |
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2, /* Size (0 = byte, 1 = short, 2 = long). */ |
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32, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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_bfd_dlx_elf_hi16_reloc,/* Special_function. */ |
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"R_DLX_RELOC_16_HI", /* Name. */ |
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TRUE, /* Partial_inplace. */ |
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0xFFFF, /* Src_mask. */ |
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0xffff, /* Dst_mask. */ |
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FALSE); /* PCrel_offset. */ |
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|
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/* Low 16 bits of symbol value. */ |
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static reloc_howto_type elf_dlx_reloc_16_lo = |
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HOWTO (R_DLX_RELOC_16_LO, /* Type. */ |
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0, /* Rightshift. */ |
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1, /* Size (0 = byte, 1 = short, 2 = long). */ |
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16, /* Bitsize. */ |
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FALSE, /* PC_relative. */ |
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0, /* Bitpos. */ |
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complain_overflow_dont,/* Complain_on_overflow. */ |
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bfd_elf_generic_reloc, /* Special_function. */ |
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"R_DLX_RELOC_16_LO", /* Name. */ |
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TRUE, /* Partial_inplace. */ |
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0xffff, /* Src_mask. */ |
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0xffff, /* Dst_mask. */ |
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FALSE); /* PCrel_offset. */ |
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|
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/* A mapping from BFD reloc types to DLX ELF reloc types. |
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Stolen from elf32-mips.c. |
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|
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More about this table - for dlx elf relocation we do not really |
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need this table, if we have a rtype defined in this table will |
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caused tc_gen_relocate confused and die on us, but if we remove |
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this table it will caused more problem, so for now simple solution |
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is to remove those entries which may cause problem. */ |
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struct elf_reloc_map |
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{ |
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bfd_reloc_code_real_type bfd_reloc_val; |
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enum elf_dlx_reloc_type elf_reloc_val; |
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}; |
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|
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static const struct elf_reloc_map dlx_reloc_map[] = |
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{ |
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{ BFD_RELOC_NONE, R_DLX_NONE }, |
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{ BFD_RELOC_16, R_DLX_RELOC_16 }, |
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{ BFD_RELOC_32, R_DLX_RELOC_32 }, |
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{ BFD_RELOC_DLX_HI16_S, R_DLX_RELOC_16_HI }, |
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{ BFD_RELOC_DLX_LO16, R_DLX_RELOC_16_LO }, |
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{ BFD_RELOC_VTABLE_INHERIT, R_DLX_GNU_VTINHERIT }, |
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{ BFD_RELOC_VTABLE_ENTRY, R_DLX_GNU_VTENTRY } |
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}; |
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|
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/* Look through the relocs for a section during the first phase. |
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Since we don't do .gots or .plts, we just need to consider the |
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virtual table relocs for gc. */ |
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|
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static bfd_boolean |
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elf32_dlx_check_relocs (bfd *abfd, |
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struct bfd_link_info *info, |
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asection *sec, |
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const Elf_Internal_Rela *relocs) |
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{ |
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Elf_Internal_Shdr *symtab_hdr; |
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struct elf_link_hash_entry **sym_hashes; |
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const Elf_Internal_Rela *rel; |
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const Elf_Internal_Rela *rel_end; |
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|
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if (info->relocatable) |
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return TRUE; |
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symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
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sym_hashes = elf_sym_hashes (abfd); |
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rel_end = relocs + sec->reloc_count; |
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for (rel = relocs; rel < rel_end; rel++) |
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{ |
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struct elf_link_hash_entry *h; |
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unsigned long r_symndx; |
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|
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r_symndx = ELF32_R_SYM (rel->r_info); |
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if (r_symndx < symtab_hdr->sh_info) |
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h = NULL; |
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else |
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{ |
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h = sym_hashes[r_symndx - symtab_hdr->sh_info]; |
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while (h->root.type == bfd_link_hash_indirect |
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|| h->root.type == bfd_link_hash_warning) |
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h = (struct elf_link_hash_entry *) h->root.u.i.link; |
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|
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/* PR15323, ref flags aren't set for references in the same |
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object. */ |
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h->root.non_ir_ref = 1; |
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} |
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|
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switch (ELF32_R_TYPE (rel->r_info)) |
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{ |
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/* This relocation describes the C++ object vtable hierarchy. |
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Reconstruct it for later use during GC. */ |
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case R_DLX_GNU_VTINHERIT: |
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if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) |
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return FALSE; |
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break; |
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|
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/* This relocation describes which C++ vtable entries are actually |
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used. Record for later use during GC. */ |
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case R_DLX_GNU_VTENTRY: |
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BFD_ASSERT (h != NULL); |
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if (h != NULL |
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&& !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) |
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return FALSE; |
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break; |
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} |
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} |
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|
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return TRUE; |
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} |
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|
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/* Given a BFD reloc type, return a howto structure. */ |
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|
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static reloc_howto_type * |
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elf32_dlx_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
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bfd_reloc_code_real_type code) |
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{ |
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unsigned int i; |
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|
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for (i = 0; i < sizeof (dlx_reloc_map) / sizeof (struct elf_reloc_map); i++) |
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if (dlx_reloc_map[i].bfd_reloc_val == code) |
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return &dlx_elf_howto_table[(int) dlx_reloc_map[i].elf_reloc_val]; |
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|
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switch (code) |
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{ |
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default: |
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bfd_set_error (bfd_error_bad_value); |
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return NULL; |
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case BFD_RELOC_16_PCREL_S2: |
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return &elf_dlx_gnu_rel16_s2; |
|
case BFD_RELOC_DLX_JMP26: |
|
return &elf_dlx_gnu_rel26_s2; |
|
case BFD_RELOC_HI16_S: |
|
return &elf_dlx_reloc_16_hi; |
|
case BFD_RELOC_LO16: |
|
return &elf_dlx_reloc_16_lo; |
|
} |
|
} |
|
|
|
static reloc_howto_type * |
|
elf32_dlx_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED, |
|
const char *r_name) |
|
{ |
|
unsigned int i; |
|
|
|
for (i = 0; |
|
i < sizeof (dlx_elf_howto_table) / sizeof (dlx_elf_howto_table[0]); |
|
i++) |
|
if (dlx_elf_howto_table[i].name != NULL |
|
&& strcasecmp (dlx_elf_howto_table[i].name, r_name) == 0) |
|
return &dlx_elf_howto_table[i]; |
|
|
|
if (strcasecmp (elf_dlx_gnu_rel16_s2.name, r_name) == 0) |
|
return &elf_dlx_gnu_rel16_s2; |
|
if (strcasecmp (elf_dlx_gnu_rel26_s2.name, r_name) == 0) |
|
return &elf_dlx_gnu_rel26_s2; |
|
if (strcasecmp (elf_dlx_reloc_16_hi.name, r_name) == 0) |
|
return &elf_dlx_reloc_16_hi; |
|
if (strcasecmp (elf_dlx_reloc_16_lo.name, r_name) == 0) |
|
return &elf_dlx_reloc_16_lo; |
|
|
|
return NULL; |
|
} |
|
|
|
static reloc_howto_type * |
|
dlx_rtype_to_howto (unsigned int r_type) |
|
{ |
|
switch (r_type) |
|
{ |
|
case R_DLX_RELOC_16_PCREL: |
|
return & elf_dlx_gnu_rel16_s2; |
|
case R_DLX_RELOC_26_PCREL: |
|
return & elf_dlx_gnu_rel26_s2; |
|
case R_DLX_RELOC_16_HI: |
|
return & elf_dlx_reloc_16_hi; |
|
case R_DLX_RELOC_16_LO: |
|
return & elf_dlx_reloc_16_lo; |
|
default: |
|
BFD_ASSERT (r_type < (unsigned int) R_DLX_max); |
|
return & dlx_elf_howto_table[r_type]; |
|
} |
|
} |
|
|
|
static void |
|
elf32_dlx_info_to_howto (bfd * abfd ATTRIBUTE_UNUSED, |
|
arelent * cache_ptr ATTRIBUTE_UNUSED, |
|
Elf_Internal_Rela * dst ATTRIBUTE_UNUSED) |
|
{ |
|
abort (); |
|
} |
|
|
|
static void |
|
elf32_dlx_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
|
arelent *cache_ptr, |
|
Elf_Internal_Rela *dst) |
|
{ |
|
unsigned int r_type; |
|
|
|
r_type = ELF32_R_TYPE (dst->r_info); |
|
cache_ptr->howto = dlx_rtype_to_howto (r_type); |
|
return; |
|
} |
|
|
|
#define TARGET_BIG_SYM dlx_elf32_be_vec |
|
#define TARGET_BIG_NAME "elf32-dlx" |
|
#define ELF_ARCH bfd_arch_dlx |
|
#define ELF_MACHINE_CODE EM_DLX |
|
#define ELF_MAXPAGESIZE 1 /* FIXME: This number is wrong, It should be the page size in bytes. */ |
|
|
|
#include "elf32-target.h"
|
|
|