| /* MSP430-specific support for 32-bit ELF |
| Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. |
| Contributed by Dmitry Diky <diwil@mail.ru> |
| |
| 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
| |
| #include "bfd.h" |
| #include "sysdep.h" |
| #include "libiberty.h" |
| #include "libbfd.h" |
| #include "elf-bfd.h" |
| #include "elf/msp430.h" |
| |
| /* 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 */ |
| 0, /* 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 */ |
| 0, /* 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 */ |
| |
| /* A 13 bit PC relative relocation for complicated polymorphs. */ |
| HOWTO (R_MSP430_2X_PCREL, /* type */ |
| 1, /* rightshift */ |
| 2, /* 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_2X_PCREL", /* name */ |
| FALSE, /* partial_inplace */ |
| 0xfff, /* src_mask */ |
| 0xfff, /* dst_mask */ |
| TRUE), /* pcrel_offset */ |
| |
| /* A 16 bit relaxable relocation for command address. */ |
| HOWTO (R_MSP430_RL_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_RL_PCREL", /* name */ |
| FALSE, /* partial_inplace */ |
| 0, /* 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}, |
| {BFD_RELOC_MSP430_2X_PCREL, R_MSP430_2X_PCREL}, |
| {BFD_RELOC_MSP430_RL_PCREL, R_MSP430_RL_PCREL} |
| }; |
| |
| static reloc_howto_type * |
| bfd_elf32_bfd_reloc_type_lookup (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 (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 (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 (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 (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->relocatable) |
| 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]; |
| 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; |
| } |
| } |
| |
| 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 (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_2X_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); |
| /* Handle second jump instruction. */ |
| x = bfd_get_16 (input_bfd, contents - 2); |
| srel += 1; |
| x = (x & 0xfc00) | (srel & 0x3ff); |
| bfd_put_16 (input_bfd, x, contents - 2); |
| break; |
| |
| case R_MSP430_16_PCREL: |
| case R_MSP430_RL_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 (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 |
| { |
| bfd_boolean unresolved_reloc, warned; |
| |
| RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel, |
| r_symndx, symtab_hdr, sym_hashes, |
| h, sec, relocation, |
| unresolved_reloc, warned); |
| } |
| |
| 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, (h ? &h->root : NULL), 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 (bfd * abfd, |
| bfd_boolean linker ATTRIBUTE_UNUSED) |
| { |
| unsigned long val; |
| |
| switch (bfd_get_mach (abfd)) |
| { |
| default: |
| case bfd_mach_msp110: |
| val = E_MSP430_MACH_MSP430x11x1; |
| break; |
| |
| case bfd_mach_msp11: |
| val = E_MSP430_MACH_MSP430x11; |
| break; |
| |
| case bfd_mach_msp12: |
| val = E_MSP430_MACH_MSP430x12; |
| break; |
| |
| case bfd_mach_msp13: |
| val = E_MSP430_MACH_MSP430x13; |
| break; |
| |
| case bfd_mach_msp14: |
| val = E_MSP430_MACH_MSP430x14; |
| break; |
| |
| case bfd_mach_msp15: |
| val = E_MSP430_MACH_MSP430x15; |
| break; |
| |
| case bfd_mach_msp16: |
| val = E_MSP430_MACH_MSP430x16; |
| 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_msp41: |
| val = E_MSP430_MACH_MSP430x41; |
| break; |
| |
| case bfd_mach_msp42: |
| val = E_MSP430_MACH_MSP430x42; |
| break; |
| |
| case bfd_mach_msp43: |
| val = E_MSP430_MACH_MSP430x43; |
| break; |
| |
| case bfd_mach_msp44: |
| val = E_MSP430_MACH_MSP430x44; |
| 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 (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_MSP430x11: |
| e_set = bfd_mach_msp11; |
| break; |
| |
| case E_MSP430_MACH_MSP430x11x1: |
| e_set = bfd_mach_msp110; |
| break; |
| |
| case E_MSP430_MACH_MSP430x12: |
| e_set = bfd_mach_msp12; |
| 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_MSP430x15: |
| e_set = bfd_mach_msp15; |
| break; |
| |
| case E_MSP430_MACH_MSP430x16: |
| e_set = bfd_mach_msp16; |
| 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_MSP430x41: |
| e_set = bfd_mach_msp41; |
| break; |
| |
| case E_MSP430_MACH_MSP430x42: |
| e_set = bfd_mach_msp42; |
| break; |
| |
| case E_MSP430_MACH_MSP430x43: |
| e_set = bfd_mach_msp43; |
| break; |
| |
| case E_MSP430_MACH_MSP430x44: |
| e_set = bfd_mach_msp44; |
| break; |
| } |
| } |
| |
| return bfd_default_set_arch_mach (abfd, bfd_arch_msp430, e_set); |
| } |
| |
| static void |
| elf32_msp430_post_process_headers (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; |
| } |
| |
| /* These functions handle relaxing for the msp430. |
| Relaxation required only in two cases: |
| - Bad hand coding like jumps from one section to another or |
| from file to file. |
| - Sibling calls. This will affect onlu 'jump label' polymorph. Without |
| relaxing this enlarges code by 2 bytes. Sibcalls implemented but |
| do not work in gcc's port by the reason I do not know. |
| Anyway, if a relaxation required, user should pass -relax option to the |
| linker. |
| |
| There are quite a few relaxing opportunities available on the msp430: |
| |
| ================================================================ |
| |
| 1. 3 words -> 1 word |
| |
| eq == jeq label jne +4; br lab |
| ne != jne label jeq +4; br lab |
| lt < jl label jge +4; br lab |
| ltu < jlo label lhs +4; br lab |
| ge >= jge label jl +4; br lab |
| geu >= jhs label jlo +4; br lab |
| |
| 2. 4 words -> 1 word |
| |
| ltn < jn jn +2; jmp +4; br lab |
| |
| 3. 4 words -> 2 words |
| |
| gt > jeq +2; jge label jeq +6; jl +4; br label |
| gtu > jeq +2; jhs label jeq +6; jlo +4; br label |
| |
| 4. 4 words -> 2 words and 2 labels |
| |
| leu <= jeq label; jlo label jeq +2; jhs +4; br label |
| le <= jeq label; jl label jeq +2; jge +4; br label |
| ================================================================= |
| |
| codemap for first cases is (labels masked ): |
| eq: 0x2002,0x4010,0x0000 -> 0x2400 |
| ne: 0x2402,0x4010,0x0000 -> 0x2000 |
| lt: 0x3402,0x4010,0x0000 -> 0x3800 |
| ltu: 0x2c02,0x4010,0x0000 -> 0x2800 |
| ge: 0x3802,0x4010,0x0000 -> 0x3400 |
| geu: 0x2802,0x4010,0x0000 -> 0x2c00 |
| |
| second case: |
| ltn: 0x3001,0x3c02,0x4010,0x0000 -> 0x3000 |
| |
| third case: |
| gt: 0x2403,0x3802,0x4010,0x0000 -> 0x2401,0x3400 |
| gtu: 0x2403,0x2802,0x4010,0x0000 -> 0x2401,0x2c00 |
| |
| fourth case: |
| leu: 0x2401,0x2c02,0x4010,0x0000 -> 0x2400,0x2800 |
| le: 0x2401,0x3402,0x4010,0x0000 -> 0x2400,0x3800 |
| |
| Unspecified case :) |
| jump: 0x4010,0x0000 -> 0x3c00. */ |
| |
| #define NUMB_RELAX_CODES 12 |
| static struct rcodes_s |
| { |
| int f0, f1; /* From code. */ |
| int t0, t1; /* To code. */ |
| int labels; /* Position of labels: 1 - one label at first |
| word, 2 - one at second word, 3 - two |
| labels at both. */ |
| int cdx; /* Words to match. */ |
| int bs; /* Shrink bytes. */ |
| int off; /* Offset from old label for new code. */ |
| int ncl; /* New code length. */ |
| } rcode[] = |
| {/* lab,cdx,bs,off,ncl */ |
| { 0x0000, 0x0000, 0x3c00, 0x0000, 1, 0, 2, 2, 2}, /* jump */ |
| { 0x0000, 0x2002, 0x2400, 0x0000, 1, 1, 4, 4, 2}, /* eq */ |
| { 0x0000, 0x2402, 0x2000, 0x0000, 1, 1, 4, 4, 2}, /* ne */ |
| { 0x0000, 0x3402, 0x3800, 0x0000, 1, 1, 4, 4, 2}, /* lt */ |
| { 0x0000, 0x2c02, 0x2800, 0x0000, 1, 1, 4, 4, 2}, /* ltu */ |
| { 0x0000, 0x3802, 0x3400, 0x0000, 1, 1, 4, 4, 2}, /* ge */ |
| { 0x0000, 0x2802, 0x2c00, 0x0000, 1, 1, 4, 4, 2}, /* geu */ |
| { 0x3001, 0x3c02, 0x3000, 0x0000, 1, 2, 6, 6, 2}, /* ltn */ |
| { 0x2403, 0x3802, 0x2401, 0x3400, 2, 2, 4, 6, 4}, /* gt */ |
| { 0x2403, 0x2802, 0x2401, 0x2c00, 2, 2, 4, 6, 4}, /* gtu */ |
| { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* leu , 2 labels */ |
| { 0x2401, 0x2c02, 0x2400, 0x2800, 3, 2, 4, 6, 4}, /* le , 2 labels */ |
| { 0, 0, 0, 0, 0, 0, 0, 0, 0} |
| }; |
| |
| /* Return TRUE if a symbol exists at the given address. */ |
| |
| static bfd_boolean |
| msp430_elf_symbol_address_p (bfd * abfd, |
| asection * sec, |
| Elf_Internal_Sym * isym, |
| bfd_vma addr) |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| unsigned int sec_shndx; |
| Elf_Internal_Sym *isymend; |
| struct elf_link_hash_entry **sym_hashes; |
| struct elf_link_hash_entry **end_hashes; |
| unsigned int symcount; |
| |
| sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| |
| /* Examine all the local symbols. */ |
| symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
| for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) |
| if (isym->st_shndx == sec_shndx && isym->st_value == addr) |
| return TRUE; |
| |
| symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| - symtab_hdr->sh_info); |
| sym_hashes = elf_sym_hashes (abfd); |
| end_hashes = sym_hashes + symcount; |
| for (; sym_hashes < end_hashes; sym_hashes++) |
| { |
| struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| |
| if ((sym_hash->root.type == bfd_link_hash_defined |
| || sym_hash->root.type == bfd_link_hash_defweak) |
| && sym_hash->root.u.def.section == sec |
| && sym_hash->root.u.def.value == addr) |
| return TRUE; |
| } |
| |
| return FALSE; |
| } |
| |
| /* Adjust all local symbols defined as '.section + 0xXXXX' (.section has sec_shndx) |
| referenced from current and other sections */ |
| static bfd_boolean |
| msp430_elf_relax_adjust_locals(bfd * abfd, asection * sec, bfd_vma addr, |
| int count, unsigned int sec_shndx, bfd_vma toaddr) |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| Elf_Internal_Rela *irel; |
| Elf_Internal_Rela *irelend; |
| Elf_Internal_Sym *isym; |
| |
| irel = elf_section_data (sec)->relocs; |
| irelend = irel + sec->reloc_count; |
| symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| |
| for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| { |
| int sidx = ELF32_R_SYM(irel->r_info); |
| Elf_Internal_Sym *lsym = isym + sidx; |
| |
| /* Adjust symbols referenced by .sec+0xXX */ |
| if (irel->r_addend > addr && irel->r_addend < toaddr |
| && lsym->st_shndx == sec_shndx) |
| irel->r_addend -= count; |
| } |
| |
| return TRUE; |
| } |
| |
| /* Delete some bytes from a section while relaxing. */ |
| |
| static bfd_boolean |
| msp430_elf_relax_delete_bytes (bfd * abfd, asection * sec, bfd_vma addr, |
| int count) |
| { |
| Elf_Internal_Shdr *symtab_hdr; |
| unsigned int sec_shndx; |
| bfd_byte *contents; |
| Elf_Internal_Rela *irel; |
| Elf_Internal_Rela *irelend; |
| Elf_Internal_Rela *irelalign; |
| bfd_vma toaddr; |
| Elf_Internal_Sym *isym; |
| Elf_Internal_Sym *isymend; |
| struct elf_link_hash_entry **sym_hashes; |
| struct elf_link_hash_entry **end_hashes; |
| unsigned int symcount; |
| asection *p; |
| |
| sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec); |
| |
| contents = elf_section_data (sec)->this_hdr.contents; |
| |
| /* The deletion must stop at the next ALIGN reloc for an aligment |
| power larger than the number of bytes we are deleting. */ |
| |
| irelalign = NULL; |
| toaddr = sec->size; |
| |
| irel = elf_section_data (sec)->relocs; |
| irelend = irel + sec->reloc_count; |
| |
| /* Actually delete the bytes. */ |
| memmove (contents + addr, contents + addr + count, |
| (size_t) (toaddr - addr - count)); |
| sec->size -= count; |
| |
| /* Adjust all the relocs. */ |
| symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++) |
| { |
| /* Get the new reloc address. */ |
| if ((irel->r_offset > addr && irel->r_offset < toaddr)) |
| irel->r_offset -= count; |
| } |
| |
| for (p = abfd->sections; p != NULL; p = p->next) |
| msp430_elf_relax_adjust_locals(abfd,p,addr,count,sec_shndx,toaddr); |
| |
| /* Adjust the local symbols defined in this section. */ |
| symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| isym = (Elf_Internal_Sym *) symtab_hdr->contents; |
| for (isymend = isym + symtab_hdr->sh_info; isym < isymend; isym++) |
| if (isym->st_shndx == sec_shndx |
| && isym->st_value > addr && isym->st_value < toaddr) |
| isym->st_value -= count; |
| |
| /* Now adjust the global symbols defined in this section. */ |
| symcount = (symtab_hdr->sh_size / sizeof (Elf32_External_Sym) |
| - symtab_hdr->sh_info); |
| sym_hashes = elf_sym_hashes (abfd); |
| end_hashes = sym_hashes + symcount; |
| for (; sym_hashes < end_hashes; sym_hashes++) |
| { |
| struct elf_link_hash_entry *sym_hash = *sym_hashes; |
| |
| if ((sym_hash->root.type == bfd_link_hash_defined |
| || sym_hash->root.type == bfd_link_hash_defweak) |
| && sym_hash->root.u.def.section == sec |
| && sym_hash->root.u.def.value > addr |
| && sym_hash->root.u.def.value < toaddr) |
| sym_hash->root.u.def.value -= count; |
| } |
| |
| return TRUE; |
| } |
| |
| |
| static bfd_boolean |
| msp430_elf_relax_section (bfd * abfd, asection * sec, |
| struct bfd_link_info * link_info, |
| bfd_boolean * again) |
| { |
| Elf_Internal_Shdr * symtab_hdr; |
| Elf_Internal_Rela * internal_relocs; |
| Elf_Internal_Rela * irel; |
| Elf_Internal_Rela * irelend; |
| bfd_byte * contents = NULL; |
| Elf_Internal_Sym * isymbuf = NULL; |
| |
| /* Assume nothing changes. */ |
| *again = FALSE; |
| |
| /* We don't have to do anything for a relocatable link, if |
| this section does not have relocs, or if this is not a |
| code section. */ |
| if (link_info->relocatable |
| || (sec->flags & SEC_RELOC) == 0 |
| || sec->reloc_count == 0 || (sec->flags & SEC_CODE) == 0) |
| return TRUE; |
| |
| symtab_hdr = & elf_tdata (abfd)->symtab_hdr; |
| |
| /* Get a copy of the native relocations. */ |
| internal_relocs = |
| _bfd_elf_link_read_relocs (abfd, sec, NULL, NULL, link_info->keep_memory); |
| if (internal_relocs == NULL) |
| goto error_return; |
| |
| /* Walk through them looking for relaxing opportunities. */ |
| irelend = internal_relocs + sec->reloc_count; |
| for (irel = internal_relocs; irel < irelend; irel++) |
| { |
| bfd_vma symval; |
| |
| /* If this isn't something that can be relaxed, then ignore |
| this reloc. */ |
| if (ELF32_R_TYPE (irel->r_info) != (int) R_MSP430_RL_PCREL) |
| continue; |
| |
| /* Get the section contents if we haven't done so already. */ |
| if (contents == NULL) |
| { |
| /* Get cached copy if it exists. */ |
| if (elf_section_data (sec)->this_hdr.contents != NULL) |
| contents = elf_section_data (sec)->this_hdr.contents; |
| else if (! bfd_malloc_and_get_section (abfd, sec, &contents)) |
| goto error_return; |
| } |
| |
| /* Read this BFD's local symbols if we haven't done so already. */ |
| if (isymbuf == NULL && symtab_hdr->sh_info != 0) |
| { |
| isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents; |
| if (isymbuf == NULL) |
| isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr, |
| symtab_hdr->sh_info, 0, |
| NULL, NULL, NULL); |
| if (isymbuf == NULL) |
| goto error_return; |
| } |
| |
| /* Get the value of the symbol referred to by the reloc. */ |
| if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info) |
| { |
| /* A local symbol. */ |
| Elf_Internal_Sym *isym; |
| asection *sym_sec; |
| |
| isym = isymbuf + ELF32_R_SYM (irel->r_info); |
| if (isym->st_shndx == SHN_UNDEF) |
| sym_sec = bfd_und_section_ptr; |
| else if (isym->st_shndx == SHN_ABS) |
| sym_sec = bfd_abs_section_ptr; |
| else if (isym->st_shndx == SHN_COMMON) |
| sym_sec = bfd_com_section_ptr; |
| else |
| sym_sec = bfd_section_from_elf_index (abfd, isym->st_shndx); |
| symval = (isym->st_value |
| + sym_sec->output_section->vma + sym_sec->output_offset); |
| } |
| else |
| { |
| unsigned long indx; |
| struct elf_link_hash_entry *h; |
| |
| /* An external symbol. */ |
| indx = ELF32_R_SYM (irel->r_info) - symtab_hdr->sh_info; |
| h = elf_sym_hashes (abfd)[indx]; |
| BFD_ASSERT (h != NULL); |
| |
| if (h->root.type != bfd_link_hash_defined |
| && h->root.type != bfd_link_hash_defweak) |
| /* This appears to be a reference to an undefined |
| symbol. Just ignore it--it will be caught by the |
| regular reloc processing. */ |
| continue; |
| |
| symval = (h->root.u.def.value |
| + h->root.u.def.section->output_section->vma |
| + h->root.u.def.section->output_offset); |
| } |
| |
| /* For simplicity of coding, we are going to modify the section |
| contents, the section relocs, and the BFD symbol table. We |
| must tell the rest of the code not to free up this |
| information. It would be possible to instead create a table |
| of changes which have to be made, as is done in coff-mips.c; |
| that would be more work, but would require less memory when |
| the linker is run. */ |
| |
| /* Try to turn a 16bit pc-relative branch into a 10bit pc-relative |
| branch. */ |
| /* Paranoia? paranoia... */ |
| if (ELF32_R_TYPE (irel->r_info) == (int) R_MSP430_RL_PCREL) |
| { |
| bfd_vma value = symval; |
| |
| /* Deal with pc-relative gunk. */ |
| value -= (sec->output_section->vma + sec->output_offset); |
| value -= irel->r_offset; |
| value += irel->r_addend; |
| |
| /* See if the value will fit in 10 bits, note the high value is |
| 1016 as the target will be two bytes closer if we are |
| able to relax. */ |
| if ((long) value < 1016 && (long) value > -1016) |
| { |
| int code0 = 0, code1 = 0, code2 = 0; |
| int i; |
| struct rcodes_s *rx; |
| |
| /* Get the opcode. */ |
| if (irel->r_offset >= 6) |
| code0 = bfd_get_16 (abfd, contents + irel->r_offset - 6); |
| |
| if (irel->r_offset >= 4) |
| code1 = bfd_get_16 (abfd, contents + irel->r_offset - 4); |
| |
| code2 = bfd_get_16 (abfd, contents + irel->r_offset - 2); |
| |
| if (code2 != 0x4010) |
| continue; |
| |
| /* Check r4 and r3. */ |
| for (i = NUMB_RELAX_CODES - 1; i >= 0; i--) |
| { |
| rx = &rcode[i]; |
| if (rx->cdx == 2 && rx->f0 == code0 && rx->f1 == code1) |
| break; |
| else if (rx->cdx == 1 && rx->f1 == code1) |
| break; |
| else if (rx->cdx == 0) /* This is an unconditional jump. */ |
| break; |
| } |
| |
| /* Check labels: |
| .Label0: ; we do not care about this label |
| jeq +6 |
| .Label1: ; make sure there is no label here |
| jl +4 |
| .Label2: ; make sure there is no label here |
| br .Label_dst |
| |
| So, if there is .Label1 or .Label2 we cannot relax this code. |
| This actually should not happen, cause for relaxable |
| instructions we use RL_PCREL reloc instead of 16_PCREL. |
| Will change this in the future. */ |
| |
| if (rx->cdx > 0 |
| && msp430_elf_symbol_address_p (abfd, sec, isymbuf, |
| irel->r_offset - 2)) |
| continue; |
| if (rx->cdx > 1 |
| && msp430_elf_symbol_address_p (abfd, sec, isymbuf, |
| irel->r_offset - 4)) |
| continue; |
| |
| /* Note that we've changed the relocs, section contents, etc. */ |
| elf_section_data (sec)->relocs = internal_relocs; |
| elf_section_data (sec)->this_hdr.contents = contents; |
| symtab_hdr->contents = (unsigned char *) isymbuf; |
| |
| /* Fix the relocation's type. */ |
| if (rx->labels == 3) /* Handle special cases. */ |
| irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| R_MSP430_2X_PCREL); |
| else |
| irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info), |
| R_MSP430_10_PCREL); |
| |
| /* Fix the opcode right way. */ |
| bfd_put_16 (abfd, rx->t0, contents + irel->r_offset - rx->off); |
| if (rx->t1) |
| bfd_put_16 (abfd, rx->t1, |
| contents + irel->r_offset - rx->off + 2); |
| |
| /* Delete bytes. */ |
| if (!msp430_elf_relax_delete_bytes (abfd, sec, |
| irel->r_offset - rx->off + |
| rx->ncl, rx->bs)) |
| goto error_return; |
| |
| /* Handle unconditional jumps. */ |
| if (rx->cdx == 0) |
| irel->r_offset -= 2; |
| |
| /* That will change things, so, we should relax again. |
| Note that this is not required, and it may be slow. */ |
| *again = TRUE; |
| } |
| } |
| } |
| |
| if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| { |
| if (!link_info->keep_memory) |
| free (isymbuf); |
| else |
| { |
| /* Cache the symbols for elf_link_input_bfd. */ |
| symtab_hdr->contents = (unsigned char *) isymbuf; |
| } |
| } |
| |
| if (contents != NULL |
| && elf_section_data (sec)->this_hdr.contents != contents) |
| { |
| if (!link_info->keep_memory) |
| free (contents); |
| else |
| { |
| /* Cache the section contents for elf_link_input_bfd. */ |
| elf_section_data (sec)->this_hdr.contents = contents; |
| } |
| } |
| |
| if (internal_relocs != NULL |
| && elf_section_data (sec)->relocs != internal_relocs) |
| free (internal_relocs); |
| |
| return TRUE; |
| |
| error_return: |
| if (isymbuf != NULL && symtab_hdr->contents != (unsigned char *) isymbuf) |
| free (isymbuf); |
| if (contents != NULL |
| && elf_section_data (sec)->this_hdr.contents != contents) |
| free (contents); |
| if (internal_relocs != NULL |
| && elf_section_data (sec)->relocs != internal_relocs) |
| free (internal_relocs); |
| |
| return FALSE; |
| } |
| |
| |
| #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 |
| #define bfd_elf32_bfd_relax_section msp430_elf_relax_section |
| |
| #include "elf32-target.h" |