/* MSP430-specific support for 32-bit ELF Copyright (C) 2002 Free Software Foundation, Inc. Contributed by Dmitry Diky This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "bfd.h" #include "sysdep.h" #include "libiberty.h" #include "libbfd.h" #include "elf-bfd.h" #include "elf/msp430.h" static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup PARAMS ((bfd *, bfd_reloc_code_real_type)); static void msp430_info_to_howto_rela PARAMS ((bfd *, arelent *, Elf_Internal_Rela *)); static asection *elf32_msp430_gc_mark_hook PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *, struct elf_link_hash_entry *, Elf_Internal_Sym *)); static bfd_boolean elf32_msp430_gc_sweep_hook PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static bfd_boolean elf32_msp430_check_relocs PARAMS ((bfd *, struct bfd_link_info *, asection *, const Elf_Internal_Rela *)); static bfd_reloc_status_type msp430_final_link_relocate PARAMS ((reloc_howto_type *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, bfd_vma)); static bfd_boolean elf32_msp430_relocate_section PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *, Elf_Internal_Rela *, Elf_Internal_Sym *, asection **)); static void bfd_elf_msp430_final_write_processing PARAMS ((bfd *, bfd_boolean)); static bfd_boolean elf32_msp430_object_p PARAMS ((bfd *)); static void elf32_msp430_post_process_headers PARAMS ((bfd *, struct bfd_link_info *)); /* Use RELA instead of REL. */ #undef USE_REL static reloc_howto_type elf_msp430_howto_table[] = { HOWTO (R_MSP430_NONE, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_MSP430_NONE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MSP430_32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_MSP430_32", /* name */ FALSE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 13 bit PC relative relocation. */ HOWTO (R_MSP430_10_PCREL, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 10, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_MSP430_13_PCREL", /* name */ FALSE, /* partial_inplace */ 0xfff, /* src_mask */ 0xfff, /* dst_mask */ TRUE), /* pcrel_offset */ /* A 16 bit absolute relocation. */ HOWTO (R_MSP430_16, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_MSP430_16", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 16 bit absolute relocation for command address. */ HOWTO (R_MSP430_16_PCREL, /* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_MSP430_16_PCREL", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ TRUE), /* pcrel_offset */ /* A 16 bit absolute relocation, byte operations. */ HOWTO (R_MSP430_16_BYTE, /* type */ 0, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_MSP430_16_BYTE", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 16 bit absolute relocation for command address. */ HOWTO (R_MSP430_16_PCREL_BYTE,/* type */ 1, /* rightshift */ 1, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont,/* complain_on_overflow */ bfd_elf_generic_reloc, /* special_function */ "R_MSP430_16_PCREL_BYTE", /* name */ FALSE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ TRUE) /* pcrel_offset */ }; /* Map BFD reloc types to MSP430 ELF reloc types. */ struct msp430_reloc_map { bfd_reloc_code_real_type bfd_reloc_val; unsigned int elf_reloc_val; }; static const struct msp430_reloc_map msp430_reloc_map[] = { {BFD_RELOC_NONE, R_MSP430_NONE}, {BFD_RELOC_32, R_MSP430_32}, {BFD_RELOC_MSP430_10_PCREL, R_MSP430_10_PCREL}, {BFD_RELOC_16, R_MSP430_16_BYTE}, {BFD_RELOC_MSP430_16_PCREL, R_MSP430_16_PCREL}, {BFD_RELOC_MSP430_16, R_MSP430_16}, {BFD_RELOC_MSP430_16_PCREL_BYTE, R_MSP430_16_PCREL_BYTE}, {BFD_RELOC_MSP430_16_BYTE, R_MSP430_16_BYTE} }; static reloc_howto_type * bfd_elf32_bfd_reloc_type_lookup (abfd, code) bfd *abfd ATTRIBUTE_UNUSED; bfd_reloc_code_real_type code; { unsigned int i; for (i = 0; i < ARRAY_SIZE (msp430_reloc_map); i++) if (msp430_reloc_map[i].bfd_reloc_val == code) return &elf_msp430_howto_table[msp430_reloc_map[i].elf_reloc_val]; return NULL; } /* Set the howto pointer for an MSP430 ELF reloc. */ static void msp430_info_to_howto_rela (abfd, cache_ptr, dst) bfd *abfd ATTRIBUTE_UNUSED; arelent *cache_ptr; Elf_Internal_Rela *dst; { unsigned int r_type; r_type = ELF32_R_TYPE (dst->r_info); BFD_ASSERT (r_type < (unsigned int) R_MSP430_max); cache_ptr->howto = &elf_msp430_howto_table[r_type]; } static asection * elf32_msp430_gc_mark_hook (sec, info, rel, h, sym) asection *sec; struct bfd_link_info *info ATTRIBUTE_UNUSED; Elf_Internal_Rela *rel; struct elf_link_hash_entry *h; Elf_Internal_Sym *sym; { if (h != NULL) { switch (ELF32_R_TYPE (rel->r_info)) { default: switch (h->root.type) { case bfd_link_hash_defined: case bfd_link_hash_defweak: return h->root.u.def.section; case bfd_link_hash_common: return h->root.u.c.p->section; default: break; } } } else return bfd_section_from_elf_index (sec->owner, sym->st_shndx); return NULL; } static bfd_boolean elf32_msp430_gc_sweep_hook (abfd, info, sec, relocs) bfd *abfd ATTRIBUTE_UNUSED; struct bfd_link_info *info ATTRIBUTE_UNUSED; asection *sec ATTRIBUTE_UNUSED; const Elf_Internal_Rela *relocs ATTRIBUTE_UNUSED; { /* We don't use got and plt entries for msp430. */ return TRUE; } /* Look through the relocs for a section during the first phase. Since we don't do .gots or .plts, we just need to consider the virtual table relocs for gc. */ static bfd_boolean elf32_msp430_check_relocs (abfd, info, sec, relocs) bfd *abfd; struct bfd_link_info *info; asection *sec; const Elf_Internal_Rela *relocs; { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; const Elf_Internal_Rela *rel; const Elf_Internal_Rela *rel_end; if (info->relocateable) return TRUE; symtab_hdr = &elf_tdata (abfd)->symtab_hdr; sym_hashes = elf_sym_hashes (abfd); sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym); if (!elf_bad_symtab (abfd)) sym_hashes_end -= symtab_hdr->sh_info; rel_end = relocs + sec->reloc_count; for (rel = relocs; rel < rel_end; rel++) { struct elf_link_hash_entry *h; unsigned long r_symndx; r_symndx = ELF32_R_SYM (rel->r_info); if (r_symndx < symtab_hdr->sh_info) h = NULL; else h = sym_hashes[r_symndx - symtab_hdr->sh_info]; } return TRUE; } /* Perform a single relocation. By default we use the standard BFD routines, but a few relocs, we have to do them ourselves. */ static bfd_reloc_status_type msp430_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation) reloc_howto_type *howto; bfd *input_bfd; asection *input_section; bfd_byte *contents; Elf_Internal_Rela *rel; bfd_vma relocation; { bfd_reloc_status_type r = bfd_reloc_ok; bfd_vma x; bfd_signed_vma srel; switch (howto->type) { case R_MSP430_10_PCREL: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; srel -= rel->r_offset; srel -= 2; /* Branch instructions add 2 to the PC... */ srel -= (input_section->output_section->vma + input_section->output_offset); if (srel & 1) return bfd_reloc_outofrange; /* MSP430 addresses commands as words. */ srel >>= 1; /* Check for an overflow. */ if (srel < -512 || srel > 511) return bfd_reloc_overflow; x = bfd_get_16 (input_bfd, contents); x = (x & 0xfc00) | (srel & 0x3ff); bfd_put_16 (input_bfd, x, contents); break; case R_MSP430_16_PCREL: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; srel -= rel->r_offset; /* Only branch instructions add 2 to the PC... */ srel -= (input_section->output_section->vma + input_section->output_offset); if (srel & 1) return bfd_reloc_outofrange; bfd_put_16 (input_bfd, srel & 0xffff, contents); break; case R_MSP430_16_PCREL_BYTE: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; srel -= rel->r_offset; /* Only branch instructions add 2 to the PC... */ srel -= (input_section->output_section->vma + input_section->output_offset); bfd_put_16 (input_bfd, srel & 0xffff, contents); break; case R_MSP430_16_BYTE: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; bfd_put_16 (input_bfd, srel & 0xffff, contents); break; case R_MSP430_16: contents += rel->r_offset; srel = (bfd_signed_vma) relocation; srel += rel->r_addend; if (srel & 1) return bfd_reloc_notsupported; bfd_put_16 (input_bfd, srel & 0xffff, contents); break; default: r = _bfd_final_link_relocate (howto, input_bfd, input_section, contents, rel->r_offset, relocation, rel->r_addend); } return r; } /* Relocate an MSP430 ELF section. */ static bfd_boolean elf32_msp430_relocate_section (output_bfd, info, input_bfd, input_section, contents, relocs, local_syms, local_sections) bfd *output_bfd ATTRIBUTE_UNUSED; struct bfd_link_info *info; bfd *input_bfd; asection *input_section; bfd_byte *contents; Elf_Internal_Rela *relocs; Elf_Internal_Sym *local_syms; asection **local_sections; { Elf_Internal_Shdr *symtab_hdr; struct elf_link_hash_entry **sym_hashes; Elf_Internal_Rela *rel; Elf_Internal_Rela *relend; symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; sym_hashes = elf_sym_hashes (input_bfd); relend = relocs + input_section->reloc_count; for (rel = relocs; rel < relend; rel++) { reloc_howto_type *howto; unsigned long r_symndx; Elf_Internal_Sym *sym; asection *sec; struct elf_link_hash_entry *h; bfd_vma relocation; bfd_reloc_status_type r; const char *name = NULL; int r_type; /* This is a final link. */ r_type = ELF32_R_TYPE (rel->r_info); r_symndx = ELF32_R_SYM (rel->r_info); howto = elf_msp430_howto_table + ELF32_R_TYPE (rel->r_info); h = NULL; sym = NULL; sec = NULL; if (r_symndx < symtab_hdr->sh_info) { sym = local_syms + r_symndx; sec = local_sections[r_symndx]; relocation = _bfd_elf_rela_local_sym (output_bfd, sym, sec, rel); name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, sym->st_name); name = (name == NULL) ? bfd_section_name (input_bfd, sec) : name; } else { h = sym_hashes[r_symndx - symtab_hdr->sh_info]; while (h->root.type == bfd_link_hash_indirect || h->root.type == bfd_link_hash_warning) h = (struct elf_link_hash_entry *) h->root.u.i.link; name = h->root.root.string; if (h->root.type == bfd_link_hash_defined || h->root.type == bfd_link_hash_defweak) { sec = h->root.u.def.section; relocation = (h->root.u.def.value + sec->output_section->vma + sec->output_offset); } else if (h->root.type == bfd_link_hash_undefweak) { relocation = 0; } else { if (!((*info->callbacks->undefined_symbol) (info, h->root.root.string, input_bfd, input_section, rel->r_offset, TRUE))) return FALSE; relocation = 0; } } r = msp430_final_link_relocate (howto, input_bfd, input_section, contents, rel, relocation); if (r != bfd_reloc_ok) { const char *msg = (const char *) NULL; switch (r) { case bfd_reloc_overflow: r = info->callbacks->reloc_overflow (info, name, howto->name, (bfd_vma) 0, input_bfd, input_section, rel->r_offset); break; case bfd_reloc_undefined: r = info->callbacks->undefined_symbol (info, name, input_bfd, input_section, rel->r_offset, TRUE); break; case bfd_reloc_outofrange: msg = _("internal error: out of range error"); break; case bfd_reloc_notsupported: msg = _("internal error: unsupported relocation error"); break; case bfd_reloc_dangerous: msg = _("internal error: dangerous relocation"); break; default: msg = _("internal error: unknown error"); break; } if (msg) r = info->callbacks->warning (info, msg, name, input_bfd, input_section, rel->r_offset); if (!r) return FALSE; } } return TRUE; } /* The final processing done just before writing out a MSP430 ELF object file. This gets the MSP430 architecture right based on the machine number. */ static void bfd_elf_msp430_final_write_processing (abfd, linker) bfd *abfd; bfd_boolean linker ATTRIBUTE_UNUSED; { unsigned long val; switch (bfd_get_mach (abfd)) { default: case bfd_mach_msp12: val = E_MSP430_MACH_MSP430x12; break; case bfd_mach_msp110: val = E_MSP430_MACH_MSP430x11x1; break; case bfd_mach_msp11: val = E_MSP430_MACH_MSP430x11; break; case bfd_mach_msp13: val = E_MSP430_MACH_MSP430x13; break; case bfd_mach_msp14: val = E_MSP430_MACH_MSP430x14; break; case bfd_mach_msp41: val = E_MSP430_MACH_MSP430x41; break; case bfd_mach_msp43: val = E_MSP430_MACH_MSP430x43; break; case bfd_mach_msp44: val = E_MSP430_MACH_MSP430x44; break; case bfd_mach_msp31: val = E_MSP430_MACH_MSP430x31; break; case bfd_mach_msp32: val = E_MSP430_MACH_MSP430x32; break; case bfd_mach_msp33: val = E_MSP430_MACH_MSP430x33; break; case bfd_mach_msp15: val = E_MSP430_MACH_MSP430x15; break; case bfd_mach_msp16: val = E_MSP430_MACH_MSP430x16; break; } elf_elfheader (abfd)->e_machine = EM_MSP430; elf_elfheader (abfd)->e_flags &= ~EF_MSP430_MACH; elf_elfheader (abfd)->e_flags |= val; } /* Set the right machine number. */ static bfd_boolean elf32_msp430_object_p (abfd) bfd *abfd; { int e_set = bfd_mach_msp14; if (elf_elfheader (abfd)->e_machine == EM_MSP430 || elf_elfheader (abfd)->e_machine == EM_MSP430_OLD) { int e_mach = elf_elfheader (abfd)->e_flags & EF_MSP430_MACH; switch (e_mach) { default: case E_MSP430_MACH_MSP430x12: e_set = bfd_mach_msp12; break; case E_MSP430_MACH_MSP430x11: e_set = bfd_mach_msp11; break; case E_MSP430_MACH_MSP430x11x1: e_set = bfd_mach_msp110; break; case E_MSP430_MACH_MSP430x13: e_set = bfd_mach_msp13; break; case E_MSP430_MACH_MSP430x14: e_set = bfd_mach_msp14; break; case E_MSP430_MACH_MSP430x41: e_set = bfd_mach_msp41; break; case E_MSP430_MACH_MSP430x31: e_set = bfd_mach_msp31; break; case E_MSP430_MACH_MSP430x32: e_set = bfd_mach_msp32; break; case E_MSP430_MACH_MSP430x33: e_set = bfd_mach_msp33; break; case E_MSP430_MACH_MSP430x43: e_set = bfd_mach_msp43; break; case E_MSP430_MACH_MSP430x44: e_set = bfd_mach_msp44; break; case E_MSP430_MACH_MSP430x15: e_set = bfd_mach_msp15; break; case E_MSP430_MACH_MSP430x16: e_set = bfd_mach_msp16; break; } } return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set); } static void elf32_msp430_post_process_headers (abfd, link_info) bfd *abfd; struct bfd_link_info *link_info ATTRIBUTE_UNUSED; { Elf_Internal_Ehdr *i_ehdrp; /* ELF file header, internal form. */ i_ehdrp = elf_elfheader (abfd); #ifndef ELFOSABI_STANDALONE #define ELFOSABI_STANDALONE 255 #endif i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_STANDALONE; } #define ELF_ARCH bfd_arch_msp430 #define ELF_MACHINE_CODE EM_MSP430 #define ELF_MACHINE_ALT1 EM_MSP430_OLD #define ELF_MAXPAGESIZE 1 #define TARGET_LITTLE_SYM bfd_elf32_msp430_vec #define TARGET_LITTLE_NAME "elf32-msp430" #define elf_info_to_howto msp430_info_to_howto_rela #define elf_info_to_howto_rel NULL #define elf_backend_relocate_section elf32_msp430_relocate_section #define elf_backend_gc_mark_hook elf32_msp430_gc_mark_hook #define elf_backend_gc_sweep_hook elf32_msp430_gc_sweep_hook #define elf_backend_check_relocs elf32_msp430_check_relocs #define elf_backend_can_gc_sections 1 #define elf_backend_final_write_processing bfd_elf_msp430_final_write_processing #define elf_backend_object_p elf32_msp430_object_p #define elf_backend_post_process_headers elf32_msp430_post_process_headers #include "elf32-target.h"