diff options
Diffstat (limited to 'binutils-2.25/bfd/elf32-m68hc1x.c')
| -rw-r--r-- | binutils-2.25/bfd/elf32-m68hc1x.c | 1497 |
1 files changed, 1497 insertions, 0 deletions
diff --git a/binutils-2.25/bfd/elf32-m68hc1x.c b/binutils-2.25/bfd/elf32-m68hc1x.c new file mode 100644 index 00000000..427e3cd2 --- /dev/null +++ b/binutils-2.25/bfd/elf32-m68hc1x.c @@ -0,0 +1,1497 @@ +/* Motorola 68HC11/HC12-specific support for 32-bit ELF + Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, + 2009, 2010, 2011, 2012 Free Software Foundation, Inc. + Contributed by Stephane Carrez (stcarrez@nerim.fr) + + 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 3 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 "sysdep.h" +#include "alloca-conf.h" +#include "bfd.h" +#include "bfdlink.h" +#include "libbfd.h" +#include "elf-bfd.h" +#include "elf32-m68hc1x.h" +#include "elf/m68hc11.h" +#include "opcode/m68hc11.h" + + +#define m68hc12_stub_hash_lookup(table, string, create, copy) \ + ((struct elf32_m68hc11_stub_hash_entry *) \ + bfd_hash_lookup ((table), (string), (create), (copy))) + +static struct elf32_m68hc11_stub_hash_entry* m68hc12_add_stub + (const char *stub_name, + asection *section, + struct m68hc11_elf_link_hash_table *htab); + +static struct bfd_hash_entry *stub_hash_newfunc + (struct bfd_hash_entry *, struct bfd_hash_table *, const char *); + +static void m68hc11_elf_set_symbol (bfd* abfd, struct bfd_link_info *info, + const char* name, bfd_vma value, + asection* sec); + +static bfd_boolean m68hc11_elf_export_one_stub + (struct bfd_hash_entry *gen_entry, void *in_arg); + +static void scan_sections_for_abi (bfd*, asection*, void *); + +struct m68hc11_scan_param +{ + struct m68hc11_page_info* pinfo; + bfd_boolean use_memory_banks; +}; + + +/* Create a 68HC11/68HC12 ELF linker hash table. */ + +struct m68hc11_elf_link_hash_table* +m68hc11_elf_hash_table_create (bfd *abfd) +{ + struct m68hc11_elf_link_hash_table *ret; + bfd_size_type amt = sizeof (struct m68hc11_elf_link_hash_table); + + ret = (struct m68hc11_elf_link_hash_table *) bfd_zmalloc (amt); + if (ret == (struct m68hc11_elf_link_hash_table *) NULL) + return NULL; + + if (!_bfd_elf_link_hash_table_init (&ret->root, abfd, + _bfd_elf_link_hash_newfunc, + sizeof (struct elf_link_hash_entry), + M68HC11_ELF_DATA)) + { + free (ret); + return NULL; + } + + /* Init the stub hash table too. */ + amt = sizeof (struct bfd_hash_table); + ret->stub_hash_table = (struct bfd_hash_table*) bfd_malloc (amt); + if (ret->stub_hash_table == NULL) + { + free (ret); + return NULL; + } + if (!bfd_hash_table_init (ret->stub_hash_table, stub_hash_newfunc, + sizeof (struct elf32_m68hc11_stub_hash_entry))) + return NULL; + + return ret; +} + +/* Free the derived linker hash table. */ + +void +m68hc11_elf_bfd_link_hash_table_free (struct bfd_link_hash_table *hash) +{ + struct m68hc11_elf_link_hash_table *ret + = (struct m68hc11_elf_link_hash_table *) hash; + + bfd_hash_table_free (ret->stub_hash_table); + free (ret->stub_hash_table); + _bfd_elf_link_hash_table_free (hash); +} + +/* Assorted hash table functions. */ + +/* Initialize an entry in the stub hash table. */ + +static struct bfd_hash_entry * +stub_hash_newfunc (struct bfd_hash_entry *entry, struct bfd_hash_table *table, + const char *string) +{ + /* Allocate the structure if it has not already been allocated by a + subclass. */ + if (entry == NULL) + { + entry = bfd_hash_allocate (table, + sizeof (struct elf32_m68hc11_stub_hash_entry)); + if (entry == NULL) + return entry; + } + + /* Call the allocation method of the superclass. */ + entry = bfd_hash_newfunc (entry, table, string); + if (entry != NULL) + { + struct elf32_m68hc11_stub_hash_entry *eh; + + /* Initialize the local fields. */ + eh = (struct elf32_m68hc11_stub_hash_entry *) entry; + eh->stub_sec = NULL; + eh->stub_offset = 0; + eh->target_value = 0; + eh->target_section = NULL; + } + + return entry; +} + +/* Add a new stub entry to the stub hash. Not all fields of the new + stub entry are initialised. */ + +static struct elf32_m68hc11_stub_hash_entry * +m68hc12_add_stub (const char *stub_name, asection *section, + struct m68hc11_elf_link_hash_table *htab) +{ + struct elf32_m68hc11_stub_hash_entry *stub_entry; + + /* Enter this entry into the linker stub hash table. */ + stub_entry = m68hc12_stub_hash_lookup (htab->stub_hash_table, stub_name, + TRUE, FALSE); + if (stub_entry == NULL) + { + (*_bfd_error_handler) (_("%B: cannot create stub entry %s"), + section->owner, stub_name); + return NULL; + } + + if (htab->stub_section == 0) + { + htab->stub_section = (*htab->add_stub_section) (".tramp", + htab->tramp_section); + } + + stub_entry->stub_sec = htab->stub_section; + stub_entry->stub_offset = 0; + return stub_entry; +} + +/* Hook called by the linker routine which adds symbols from an object + file. We use it for identify far symbols and force a loading of + the trampoline handler. */ + +bfd_boolean +elf32_m68hc11_add_symbol_hook (bfd *abfd, struct bfd_link_info *info, + Elf_Internal_Sym *sym, + const char **namep ATTRIBUTE_UNUSED, + flagword *flagsp ATTRIBUTE_UNUSED, + asection **secp ATTRIBUTE_UNUSED, + bfd_vma *valp ATTRIBUTE_UNUSED) +{ + if (sym->st_other & STO_M68HC12_FAR) + { + struct elf_link_hash_entry *h; + + h = (struct elf_link_hash_entry *) + bfd_link_hash_lookup (info->hash, "__far_trampoline", + FALSE, FALSE, FALSE); + if (h == NULL) + { + struct bfd_link_hash_entry* entry = NULL; + + _bfd_generic_link_add_one_symbol (info, abfd, + "__far_trampoline", + BSF_GLOBAL, + bfd_und_section_ptr, + (bfd_vma) 0, (const char*) NULL, + FALSE, FALSE, &entry); + } + + } + return TRUE; +} + +/* Merge non-visibility st_other attributes, STO_M68HC12_FAR and + STO_M68HC12_INTERRUPT. */ + +void +elf32_m68hc11_merge_symbol_attribute (struct elf_link_hash_entry *h, + const Elf_Internal_Sym *isym, + bfd_boolean definition, + bfd_boolean dynamic ATTRIBUTE_UNUSED) +{ + if (definition) + h->other = ((isym->st_other & ~ELF_ST_VISIBILITY (-1)) + | ELF_ST_VISIBILITY (h->other)); +} + +/* External entry points for sizing and building linker stubs. */ + +/* Set up various things so that we can make a list of input sections + for each output section included in the link. Returns -1 on error, + 0 when no stubs will be needed, and 1 on success. */ + +int +elf32_m68hc11_setup_section_lists (bfd *output_bfd, struct bfd_link_info *info) +{ + bfd *input_bfd; + unsigned int bfd_count; + int top_id, top_index; + asection *section; + asection **input_list, **list; + bfd_size_type amt; + asection *text_section; + struct m68hc11_elf_link_hash_table *htab; + + htab = m68hc11_elf_hash_table (info); + if (htab == NULL) + return -1; + + if (bfd_get_flavour (info->output_bfd) != bfd_target_elf_flavour) + return 0; + + /* Count the number of input BFDs and find the top input section id. + Also search for an existing ".tramp" section so that we know + where generated trampolines must go. Default to ".text" if we + can't find it. */ + htab->tramp_section = 0; + text_section = 0; + for (input_bfd = info->input_bfds, bfd_count = 0, top_id = 0; + input_bfd != NULL; + input_bfd = input_bfd->link_next) + { + bfd_count += 1; + for (section = input_bfd->sections; + section != NULL; + section = section->next) + { + const char* name = bfd_get_section_name (input_bfd, section); + + if (!strcmp (name, ".tramp")) + htab->tramp_section = section; + + if (!strcmp (name, ".text")) + text_section = section; + + if (top_id < section->id) + top_id = section->id; + } + } + htab->bfd_count = bfd_count; + if (htab->tramp_section == 0) + htab->tramp_section = text_section; + + /* We can't use output_bfd->section_count here to find the top output + section index as some sections may have been removed, and + strip_excluded_output_sections doesn't renumber the indices. */ + for (section = output_bfd->sections, top_index = 0; + section != NULL; + section = section->next) + { + if (top_index < section->index) + top_index = section->index; + } + + htab->top_index = top_index; + amt = sizeof (asection *) * (top_index + 1); + input_list = (asection **) bfd_malloc (amt); + htab->input_list = input_list; + if (input_list == NULL) + return -1; + + /* For sections we aren't interested in, mark their entries with a + value we can check later. */ + list = input_list + top_index; + do + *list = bfd_abs_section_ptr; + while (list-- != input_list); + + for (section = output_bfd->sections; + section != NULL; + section = section->next) + { + if ((section->flags & SEC_CODE) != 0) + input_list[section->index] = NULL; + } + + return 1; +} + +/* Determine and set the size of the stub section for a final link. + + The basic idea here is to examine all the relocations looking for + PC-relative calls to a target that is unreachable with a "bl" + instruction. */ + +bfd_boolean +elf32_m68hc11_size_stubs (bfd *output_bfd, bfd *stub_bfd, + struct bfd_link_info *info, + asection * (*add_stub_section) (const char*, asection*)) +{ + bfd *input_bfd; + asection *section; + Elf_Internal_Sym *local_syms, **all_local_syms; + unsigned int bfd_indx, bfd_count; + bfd_size_type amt; + asection *stub_sec; + struct m68hc11_elf_link_hash_table *htab = m68hc11_elf_hash_table (info); + + if (htab == NULL) + return FALSE; + + /* Stash our params away. */ + htab->stub_bfd = stub_bfd; + htab->add_stub_section = add_stub_section; + + /* Count the number of input BFDs and find the top input section id. */ + for (input_bfd = info->input_bfds, bfd_count = 0; + input_bfd != NULL; + input_bfd = input_bfd->link_next) + bfd_count += 1; + + /* We want to read in symbol extension records only once. To do this + we need to read in the local symbols in parallel and save them for + later use; so hold pointers to the local symbols in an array. */ + amt = sizeof (Elf_Internal_Sym *) * bfd_count; + all_local_syms = (Elf_Internal_Sym **) bfd_zmalloc (amt); + if (all_local_syms == NULL) + return FALSE; + + /* Walk over all the input BFDs, swapping in local symbols. */ + for (input_bfd = info->input_bfds, bfd_indx = 0; + input_bfd != NULL; + input_bfd = input_bfd->link_next, bfd_indx++) + { + Elf_Internal_Shdr *symtab_hdr; + + /* We'll need the symbol table in a second. */ + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + if (symtab_hdr->sh_info == 0) + continue; + + /* We need an array of the local symbols attached to the input bfd. */ + local_syms = (Elf_Internal_Sym *) symtab_hdr->contents; + if (local_syms == NULL) + { + local_syms = bfd_elf_get_elf_syms (input_bfd, symtab_hdr, + symtab_hdr->sh_info, 0, + NULL, NULL, NULL); + /* Cache them for elf_link_input_bfd. */ + symtab_hdr->contents = (unsigned char *) local_syms; + } + if (local_syms == NULL) + { + free (all_local_syms); + return FALSE; + } + + all_local_syms[bfd_indx] = local_syms; + } + + for (input_bfd = info->input_bfds, bfd_indx = 0; + input_bfd != NULL; + input_bfd = input_bfd->link_next, bfd_indx++) + { + Elf_Internal_Shdr *symtab_hdr; + struct elf_link_hash_entry ** sym_hashes; + + sym_hashes = elf_sym_hashes (input_bfd); + + /* We'll need the symbol table in a second. */ + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + if (symtab_hdr->sh_info == 0) + continue; + + local_syms = all_local_syms[bfd_indx]; + + /* Walk over each section attached to the input bfd. */ + for (section = input_bfd->sections; + section != NULL; + section = section->next) + { + Elf_Internal_Rela *internal_relocs, *irelaend, *irela; + + /* If there aren't any relocs, then there's nothing more + to do. */ + if ((section->flags & SEC_RELOC) == 0 + || section->reloc_count == 0) + continue; + + /* If this section is a link-once section that will be + discarded, then don't create any stubs. */ + if (section->output_section == NULL + || section->output_section->owner != output_bfd) + continue; + + /* Get the relocs. */ + internal_relocs + = _bfd_elf_link_read_relocs (input_bfd, section, NULL, + (Elf_Internal_Rela *) NULL, + info->keep_memory); + if (internal_relocs == NULL) + goto error_ret_free_local; + + /* Now examine each relocation. */ + irela = internal_relocs; + irelaend = irela + section->reloc_count; + for (; irela < irelaend; irela++) + { + unsigned int r_type, r_indx; + struct elf32_m68hc11_stub_hash_entry *stub_entry; + asection *sym_sec; + bfd_vma sym_value; + struct elf_link_hash_entry *hash; + const char *stub_name; + Elf_Internal_Sym *sym; + + r_type = ELF32_R_TYPE (irela->r_info); + + /* Only look at 16-bit relocs. */ + if (r_type != (unsigned int) R_M68HC11_16) + continue; + + /* Now determine the call target, its name, value, + section. */ + r_indx = ELF32_R_SYM (irela->r_info); + if (r_indx < symtab_hdr->sh_info) + { + /* It's a local symbol. */ + Elf_Internal_Shdr *hdr; + bfd_boolean is_far; + + sym = local_syms + r_indx; + is_far = (sym && (sym->st_other & STO_M68HC12_FAR)); + if (!is_far) + continue; + + if (sym->st_shndx >= elf_numsections (input_bfd)) + sym_sec = NULL; + else + { + hdr = elf_elfsections (input_bfd)[sym->st_shndx]; + sym_sec = hdr->bfd_section; + } + stub_name = (bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, + sym->st_name)); + sym_value = sym->st_value; + hash = NULL; + } + else + { + /* It's an external symbol. */ + int e_indx; + + e_indx = r_indx - symtab_hdr->sh_info; + hash = (struct elf_link_hash_entry *) + (sym_hashes[e_indx]); + + while (hash->root.type == bfd_link_hash_indirect + || hash->root.type == bfd_link_hash_warning) + hash = ((struct elf_link_hash_entry *) + hash->root.u.i.link); + + if (hash->root.type == bfd_link_hash_defined + || hash->root.type == bfd_link_hash_defweak + || hash->root.type == bfd_link_hash_new) + { + if (!(hash->other & STO_M68HC12_FAR)) + continue; + } + else if (hash->root.type == bfd_link_hash_undefweak) + { + continue; + } + else if (hash->root.type == bfd_link_hash_undefined) + { + continue; + } + else + { + bfd_set_error (bfd_error_bad_value); + goto error_ret_free_internal; + } + sym_sec = hash->root.u.def.section; + sym_value = hash->root.u.def.value; + stub_name = hash->root.root.string; + } + + if (!stub_name) + goto error_ret_free_internal; + + stub_entry = m68hc12_stub_hash_lookup + (htab->stub_hash_table, + stub_name, + FALSE, FALSE); + if (stub_entry == NULL) + { + if (add_stub_section == 0) + continue; + + stub_entry = m68hc12_add_stub (stub_name, section, htab); + if (stub_entry == NULL) + { + error_ret_free_internal: + if (elf_section_data (section)->relocs == NULL) + free (internal_relocs); + goto error_ret_free_local; + } + } + + stub_entry->target_value = sym_value; + stub_entry->target_section = sym_sec; + } + + /* We're done with the internal relocs, free them. */ + if (elf_section_data (section)->relocs == NULL) + free (internal_relocs); + } + } + + if (add_stub_section) + { + /* OK, we've added some stubs. Find out the new size of the + stub sections. */ + for (stub_sec = htab->stub_bfd->sections; + stub_sec != NULL; + stub_sec = stub_sec->next) + { + stub_sec->size = 0; + } + + bfd_hash_traverse (htab->stub_hash_table, htab->size_one_stub, htab); + } + free (all_local_syms); + return TRUE; + + error_ret_free_local: + free (all_local_syms); + return FALSE; +} + +/* Export the trampoline addresses in the symbol table. */ +static bfd_boolean +m68hc11_elf_export_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg) +{ + struct bfd_link_info *info; + struct m68hc11_elf_link_hash_table *htab; + struct elf32_m68hc11_stub_hash_entry *stub_entry; + char* name; + bfd_boolean result; + + info = (struct bfd_link_info *) in_arg; + htab = m68hc11_elf_hash_table (info); + if (htab == NULL) + return FALSE; + + /* Massage our args to the form they really have. */ + stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry; + + /* Generate the trampoline according to HC11 or HC12. */ + result = (* htab->build_one_stub) (gen_entry, in_arg); + + /* Make a printable name that does not conflict with the real function. */ + name = alloca (strlen (stub_entry->root.string) + 16); + sprintf (name, "tramp.%s", stub_entry->root.string); + + /* Export the symbol for debugging/disassembling. */ + m68hc11_elf_set_symbol (htab->stub_bfd, info, name, + stub_entry->stub_offset, + stub_entry->stub_sec); + return result; +} + +/* Export a symbol or set its value and section. */ +static void +m68hc11_elf_set_symbol (bfd *abfd, struct bfd_link_info *info, + const char *name, bfd_vma value, asection *sec) +{ + struct elf_link_hash_entry *h; + + h = (struct elf_link_hash_entry *) + bfd_link_hash_lookup (info->hash, name, FALSE, FALSE, FALSE); + if (h == NULL) + { + _bfd_generic_link_add_one_symbol (info, abfd, + name, + BSF_GLOBAL, + sec, + value, + (const char*) NULL, + TRUE, FALSE, NULL); + } + else + { + h->root.type = bfd_link_hash_defined; + h->root.u.def.value = value; + h->root.u.def.section = sec; + } +} + + +/* Build all the stubs associated with the current output file. The + stubs are kept in a hash table attached to the main linker hash + table. This function is called via m68hc12elf_finish in the + linker. */ + +bfd_boolean +elf32_m68hc11_build_stubs (bfd *abfd, struct bfd_link_info *info) +{ + asection *stub_sec; + struct bfd_hash_table *table; + struct m68hc11_elf_link_hash_table *htab; + struct m68hc11_scan_param param; + + m68hc11_elf_get_bank_parameters (info); + htab = m68hc11_elf_hash_table (info); + if (htab == NULL) + return FALSE; + + for (stub_sec = htab->stub_bfd->sections; + stub_sec != NULL; + stub_sec = stub_sec->next) + { + bfd_size_type size; + + /* Allocate memory to hold the linker stubs. */ + size = stub_sec->size; + stub_sec->contents = (unsigned char *) bfd_zalloc (htab->stub_bfd, size); + if (stub_sec->contents == NULL && size != 0) + return FALSE; + stub_sec->size = 0; + } + + /* Build the stubs as directed by the stub hash table. */ + table = htab->stub_hash_table; + bfd_hash_traverse (table, m68hc11_elf_export_one_stub, info); + + /* Scan the output sections to see if we use the memory banks. + If so, export the symbols that define how the memory banks + are mapped. This is used by gdb and the simulator to obtain + the information. It can be used by programs to burn the eprom + at the good addresses. */ + param.use_memory_banks = FALSE; + param.pinfo = &htab->pinfo; + bfd_map_over_sections (abfd, scan_sections_for_abi, ¶m); + if (param.use_memory_banks) + { + m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_START_NAME, + htab->pinfo.bank_physical, + bfd_abs_section_ptr); + m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_VIRTUAL_NAME, + htab->pinfo.bank_virtual, + bfd_abs_section_ptr); + m68hc11_elf_set_symbol (abfd, info, BFD_M68HC11_BANK_SIZE_NAME, + htab->pinfo.bank_size, + bfd_abs_section_ptr); + } + + return TRUE; +} + +void +m68hc11_elf_get_bank_parameters (struct bfd_link_info *info) +{ + unsigned i; + struct m68hc11_page_info *pinfo; + struct bfd_link_hash_entry *h; + struct m68hc11_elf_link_hash_table *htab; + + htab = m68hc11_elf_hash_table (info); + if (htab == NULL) + return; + + pinfo = & htab->pinfo; + if (pinfo->bank_param_initialized) + return; + + pinfo->bank_virtual = M68HC12_BANK_VIRT; + pinfo->bank_mask = M68HC12_BANK_MASK; + pinfo->bank_physical = M68HC12_BANK_BASE; + pinfo->bank_shift = M68HC12_BANK_SHIFT; + pinfo->bank_size = 1 << M68HC12_BANK_SHIFT; + + h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_START_NAME, + FALSE, FALSE, TRUE); + if (h != (struct bfd_link_hash_entry*) NULL + && h->type == bfd_link_hash_defined) + pinfo->bank_physical = (h->u.def.value + + h->u.def.section->output_section->vma + + h->u.def.section->output_offset); + + h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_VIRTUAL_NAME, + FALSE, FALSE, TRUE); + if (h != (struct bfd_link_hash_entry*) NULL + && h->type == bfd_link_hash_defined) + pinfo->bank_virtual = (h->u.def.value + + h->u.def.section->output_section->vma + + h->u.def.section->output_offset); + + h = bfd_link_hash_lookup (info->hash, BFD_M68HC11_BANK_SIZE_NAME, + FALSE, FALSE, TRUE); + if (h != (struct bfd_link_hash_entry*) NULL + && h->type == bfd_link_hash_defined) + pinfo->bank_size = (h->u.def.value + + h->u.def.section->output_section->vma + + h->u.def.section->output_offset); + + pinfo->bank_shift = 0; + for (i = pinfo->bank_size; i != 0; i >>= 1) + pinfo->bank_shift++; + pinfo->bank_shift--; + pinfo->bank_mask = (1 << pinfo->bank_shift) - 1; + pinfo->bank_physical_end = pinfo->bank_physical + pinfo->bank_size; + pinfo->bank_param_initialized = 1; + + h = bfd_link_hash_lookup (info->hash, "__far_trampoline", FALSE, + FALSE, TRUE); + if (h != (struct bfd_link_hash_entry*) NULL + && h->type == bfd_link_hash_defined) + pinfo->trampoline_addr = (h->u.def.value + + h->u.def.section->output_section->vma + + h->u.def.section->output_offset); +} + +/* Return 1 if the address is in banked memory. + This can be applied to a virtual address and to a physical address. */ +int +m68hc11_addr_is_banked (struct m68hc11_page_info *pinfo, bfd_vma addr) +{ + if (addr >= pinfo->bank_virtual) + return 1; + + if (addr >= pinfo->bank_physical && addr <= pinfo->bank_physical_end) + return 1; + + return 0; +} + +/* Return the physical address seen by the processor, taking + into account banked memory. */ +bfd_vma +m68hc11_phys_addr (struct m68hc11_page_info *pinfo, bfd_vma addr) +{ + if (addr < pinfo->bank_virtual) + return addr; + + /* Map the address to the memory bank. */ + addr -= pinfo->bank_virtual; + addr &= pinfo->bank_mask; + addr += pinfo->bank_physical; + return addr; +} + +/* Return the page number corresponding to an address in banked memory. */ +bfd_vma +m68hc11_phys_page (struct m68hc11_page_info *pinfo, bfd_vma addr) +{ + if (addr < pinfo->bank_virtual) + return 0; + + /* Map the address to the memory bank. */ + addr -= pinfo->bank_virtual; + addr >>= pinfo->bank_shift; + addr &= 0x0ff; + return addr; +} + +/* This function is used for relocs which are only used for relaxing, + which the linker should otherwise ignore. */ + +bfd_reloc_status_type +m68hc11_elf_ignore_reloc (bfd *abfd ATTRIBUTE_UNUSED, + arelent *reloc_entry, + asymbol *symbol ATTRIBUTE_UNUSED, + void *data ATTRIBUTE_UNUSED, + asection *input_section, + bfd *output_bfd, + char **error_message ATTRIBUTE_UNUSED) +{ + if (output_bfd != NULL) + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; +} + +bfd_reloc_status_type +m68hc11_elf_special_reloc (bfd *abfd ATTRIBUTE_UNUSED, + arelent *reloc_entry, + asymbol *symbol, + void *data ATTRIBUTE_UNUSED, + asection *input_section, + bfd *output_bfd, + char **error_message ATTRIBUTE_UNUSED) +{ + if (output_bfd != (bfd *) NULL + && (symbol->flags & BSF_SECTION_SYM) == 0 + && (! reloc_entry->howto->partial_inplace + || reloc_entry->addend == 0)) + { + reloc_entry->address += input_section->output_offset; + return bfd_reloc_ok; + } + + if (output_bfd != NULL) + return bfd_reloc_continue; + + if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) + return bfd_reloc_outofrange; + + abort(); +} + +/* 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. */ + +bfd_boolean +elf32_m68hc11_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; + 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); + 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; + + /* PR15323, ref flags aren't set for references in the same + object. */ + h->root.non_ir_ref = 1; + } + + switch (ELF32_R_TYPE (rel->r_info)) + { + /* This relocation describes the C++ object vtable hierarchy. + Reconstruct it for later use during GC. */ + case R_M68HC11_GNU_VTINHERIT: + if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset)) + return FALSE; + break; + + /* This relocation describes which C++ vtable entries are actually + used. Record for later use during GC. */ + case R_M68HC11_GNU_VTENTRY: + BFD_ASSERT (h != NULL); + if (h != NULL + && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_addend)) + return FALSE; + break; + } + } + + return TRUE; +} + +/* Relocate a 68hc11/68hc12 ELF section. */ +bfd_boolean +elf32_m68hc11_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, *relend; + const char *name = NULL; + struct m68hc11_page_info *pinfo; + const struct elf_backend_data * const ebd = get_elf_backend_data (input_bfd); + struct m68hc11_elf_link_hash_table *htab; + unsigned long e_flags; + + symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; + sym_hashes = elf_sym_hashes (input_bfd); + e_flags = elf_elfheader (input_bfd)->e_flags; + + htab = m68hc11_elf_hash_table (info); + if (htab == NULL) + return FALSE; + + /* Get memory bank parameters. */ + m68hc11_elf_get_bank_parameters (info); + + pinfo = & htab->pinfo; + rel = relocs; + relend = relocs + input_section->reloc_count; + + for (; rel < relend; rel++) + { + int r_type; + arelent arel; + reloc_howto_type *howto; + unsigned long r_symndx; + Elf_Internal_Sym *sym; + asection *sec; + bfd_vma relocation = 0; + bfd_reloc_status_type r = bfd_reloc_undefined; + bfd_vma phys_page; + bfd_vma phys_addr; + bfd_vma insn_addr; + bfd_vma insn_page; + bfd_boolean is_far = FALSE; + bfd_boolean is_xgate_symbol = FALSE; + bfd_boolean is_section_symbol = FALSE; + struct elf_link_hash_entry *h; + bfd_vma val; + + r_symndx = ELF32_R_SYM (rel->r_info); + r_type = ELF32_R_TYPE (rel->r_info); + + if (r_type == R_M68HC11_GNU_VTENTRY + || r_type == R_M68HC11_GNU_VTINHERIT) + continue; + + (*ebd->elf_info_to_howto_rel) (input_bfd, &arel, rel); + howto = arel.howto; + + h = NULL; + sym = NULL; + sec = NULL; + if (r_symndx < symtab_hdr->sh_info) + { + sym = local_syms + r_symndx; + sec = local_sections[r_symndx]; + relocation = (sec->output_section->vma + + sec->output_offset + + sym->st_value); + is_far = (sym && (sym->st_other & STO_M68HC12_FAR)); + is_xgate_symbol = (sym && (sym->st_target_internal)); + is_section_symbol = ELF_ST_TYPE (sym->st_info) & STT_SECTION; + } + 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); + + is_far = (h && (h->other & STO_M68HC12_FAR)); + is_xgate_symbol = (h && (h->target_internal)); + } + + if (sec != NULL && discarded_section (sec)) + RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section, + rel, 1, relend, howto, 0, contents); + + if (info->relocatable) + { + /* This is a relocatable link. We don't have to change + anything, unless the reloc is against a section symbol, + in which case we have to adjust according to where the + section symbol winds up in the output section. */ + if (sym != NULL && ELF_ST_TYPE (sym->st_info) == STT_SECTION) + rel->r_addend += sec->output_offset; + continue; + } + + if (h != NULL) + name = h->root.root.string; + else + { + name = (bfd_elf_string_from_elf_section + (input_bfd, symtab_hdr->sh_link, sym->st_name)); + if (name == NULL || *name == '\0') + name = bfd_section_name (input_bfd, sec); + } + + if (is_far && ELF32_R_TYPE (rel->r_info) == R_M68HC11_16) + { + struct elf32_m68hc11_stub_hash_entry* stub; + + stub = m68hc12_stub_hash_lookup (htab->stub_hash_table, + name, FALSE, FALSE); + if (stub) + { + relocation = stub->stub_offset + + stub->stub_sec->output_section->vma + + stub->stub_sec->output_offset; + is_far = FALSE; + } + } + + /* Do the memory bank mapping. */ + phys_addr = m68hc11_phys_addr (pinfo, relocation + rel->r_addend); + phys_page = m68hc11_phys_page (pinfo, relocation + rel->r_addend); + switch (r_type) + { + case R_M68HC12_LO8XG: + /* This relocation is specific to XGATE IMM16 calls and will precede + a HI8. tc-m68hc11 only generates them in pairs. + Leave the relocation to the HI8XG step. */ + r = bfd_reloc_ok; + r_type = R_M68HC11_NONE; + break; + + case R_M68HC12_HI8XG: + /* This relocation is specific to XGATE IMM16 calls and must follow + a LO8XG. Does not actually check that it was a LO8XG. + Adjusts high and low bytes. */ + relocation = phys_addr; + if ((e_flags & E_M68HC11_XGATE_RAMOFFSET) + && (relocation >= 0x2000)) + relocation += 0xc000; /* HARDCODED RAM offset for XGATE. */ + + /* Fetch 16 bit value including low byte in previous insn. */ + val = (bfd_get_8 (input_bfd, (bfd_byte*) contents + rel->r_offset) << 8) + | bfd_get_8 (input_bfd, (bfd_byte*) contents + rel->r_offset - 2); + + /* Add on value to preserve carry, then write zero to high byte. */ + relocation += val; + + /* Write out top byte. */ + bfd_put_8 (input_bfd, (relocation >> 8) & 0xff, + (bfd_byte*) contents + rel->r_offset); + + /* Write out low byte to previous instruction. */ + bfd_put_8 (input_bfd, relocation & 0xff, + (bfd_byte*) contents + rel->r_offset - 2); + + /* Mark as relocation completed. */ + r = bfd_reloc_ok; + r_type = R_M68HC11_NONE; + break; + + /* The HI8 and LO8 relocs are generated by %hi(expr) %lo(expr) + assembler directives. %hi does not support carry. */ + case R_M68HC11_HI8: + case R_M68HC11_LO8: + relocation = phys_addr; + break; + + case R_M68HC11_24: + /* Reloc used by 68HC12 call instruction. */ + bfd_put_16 (input_bfd, phys_addr, + (bfd_byte*) contents + rel->r_offset); + bfd_put_8 (input_bfd, phys_page, + (bfd_byte*) contents + rel->r_offset + 2); + r = bfd_reloc_ok; + r_type = R_M68HC11_NONE; + break; + + case R_M68HC11_NONE: + r = bfd_reloc_ok; + break; + + case R_M68HC11_LO16: + /* Reloc generated by %addr(expr) gas to obtain the + address as mapped in the memory bank window. */ + relocation = phys_addr; + break; + + case R_M68HC11_PAGE: + /* Reloc generated by %page(expr) gas to obtain the + page number associated with the address. */ + relocation = phys_page; + break; + + case R_M68HC11_16: + /* Get virtual address of instruction having the relocation. */ + if (is_far) + { + const char* msg; + char* buf; + msg = _("Reference to the far symbol `%s' using a wrong " + "relocation may result in incorrect execution"); + buf = alloca (strlen (msg) + strlen (name) + 10); + sprintf (buf, msg, name); + + (* info->callbacks->warning) + (info, buf, name, input_bfd, NULL, rel->r_offset); + } + + /* Get virtual address of instruction having the relocation. */ + insn_addr = input_section->output_section->vma + + input_section->output_offset + + rel->r_offset; + + insn_page = m68hc11_phys_page (pinfo, insn_addr); + + /* If we are linking an S12 instruction against an XGATE symbol, we + need to change the offset of the symbol value so that it's correct + from the S12's perspective. */ + if (is_xgate_symbol) + { + /* The ram in the global space is mapped to 0x2000 in the 16-bit + address space for S12 and 0xE000 in the 16-bit address space + for XGATE. */ + if (relocation >= 0xE000) + { + /* We offset the address by the difference + between these two mappings. */ + relocation -= 0xC000; + break; + } + else + { + const char * msg; + char * buf; + + msg = _("XGATE address (%lx) is not within shared RAM" + "(0xE000-0xFFFF), therefore you must manually offset " + "the address, and possibly manage the page, in your " + "code."); + buf = alloca (strlen (msg) + 128); + sprintf (buf, msg, phys_addr); + if (!((*info->callbacks->warning) (info, buf, name, input_bfd, + input_section, insn_addr))) + return FALSE; + break; + } + } + + if (m68hc11_addr_is_banked (pinfo, relocation + rel->r_addend) + && m68hc11_addr_is_banked (pinfo, insn_addr) + && phys_page != insn_page && !(e_flags & E_M68HC11_NO_BANK_WARNING)) + { + const char * msg; + char * buf; + + msg = _("banked address [%lx:%04lx] (%lx) is not in the same bank " + "as current banked address [%lx:%04lx] (%lx)"); + + buf = alloca (strlen (msg) + 128); + sprintf (buf, msg, phys_page, phys_addr, + (long) (relocation + rel->r_addend), + insn_page, m68hc11_phys_addr (pinfo, insn_addr), + (long) (insn_addr)); + if (!((*info->callbacks->warning) + (info, buf, name, input_bfd, input_section, + rel->r_offset))) + return FALSE; + break; + } + + if (phys_page != 0 && insn_page == 0) + { + const char * msg; + char * buf; + + msg = _("reference to a banked address [%lx:%04lx] in the " + "normal address space at %04lx"); + + buf = alloca (strlen (msg) + 128); + sprintf (buf, msg, phys_page, phys_addr, insn_addr); + if (!((*info->callbacks->warning) + (info, buf, name, input_bfd, input_section, + insn_addr))) + return FALSE; + + relocation = phys_addr; + break; + } + + /* If this is a banked address use the phys_addr so that + we stay in the banked window. */ + if (m68hc11_addr_is_banked (pinfo, relocation + rel->r_addend)) + relocation = phys_addr; + break; + } + + /* If we are linking an XGATE instruction against an S12 symbol, we + need to change the offset of the symbol value so that it's correct + from the XGATE's perspective. */ + if (!strcmp (howto->name, "R_XGATE_IMM8_LO") + || !strcmp (howto->name, "R_XGATE_IMM8_HI")) + { + /* We can only offset S12 addresses that lie within the non-paged + area of RAM. */ + if (!is_xgate_symbol && !is_section_symbol) + { + /* The ram in the global space is mapped to 0x2000 and stops at + 0x4000 in the 16-bit address space for S12 and 0xE000 in the + 16-bit address space for XGATE. */ + if (relocation >= 0x2000 && relocation < 0x4000) + /* We offset the address by the difference + between these two mappings. */ + relocation += 0xC000; + else + { + const char * msg; + char * buf; + + /* Get virtual address of instruction having the relocation. */ + insn_addr = input_section->output_section->vma + + input_section->output_offset + rel->r_offset; + + msg = _("S12 address (%lx) is not within shared RAM" + "(0x2000-0x4000), therefore you must manually " + "offset the address in your code"); + buf = alloca (strlen (msg) + 128); + sprintf (buf, msg, phys_addr); + if (!((*info->callbacks->warning) (info, buf, name, input_bfd, + input_section, insn_addr))) + return FALSE; + break; + } + } + } + + if (r_type != R_M68HC11_NONE) + { + if ((r_type == R_M68HC12_PCREL_9) || (r_type == R_M68HC12_PCREL_10)) + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation - 2, rel->r_addend); + else + r = _bfd_final_link_relocate (howto, input_bfd, input_section, + contents, rel->r_offset, + relocation, rel->r_addend); + } + + if (r != bfd_reloc_ok) + { + const char * msg = (const char *) 0; + + switch (r) + { + case bfd_reloc_overflow: + if (!((*info->callbacks->reloc_overflow) + (info, NULL, name, howto->name, (bfd_vma) 0, + input_bfd, input_section, rel->r_offset))) + return FALSE; + break; + + case bfd_reloc_undefined: + if (!((*info->callbacks->undefined_symbol) + (info, name, input_bfd, input_section, + rel->r_offset, TRUE))) + return FALSE; + break; + + case bfd_reloc_outofrange: + msg = _ ("internal error: out of range error"); + goto common_error; + + case bfd_reloc_notsupported: + msg = _ ("internal error: unsupported relocation error"); + goto common_error; + + case bfd_reloc_dangerous: + msg = _ ("internal error: dangerous error"); + goto common_error; + + default: + msg = _ ("internal error: unknown error"); + /* fall through */ + + common_error: + if (!((*info->callbacks->warning) + (info, msg, name, input_bfd, input_section, + rel->r_offset))) + return FALSE; + break; + } + } + } + + return TRUE; +} + + + +/* Set and control ELF flags in ELF header. */ + +bfd_boolean +_bfd_m68hc11_elf_set_private_flags (bfd *abfd, flagword flags) +{ + BFD_ASSERT (!elf_flags_init (abfd) + || elf_elfheader (abfd)->e_flags == flags); + + elf_elfheader (abfd)->e_flags = flags; + elf_flags_init (abfd) = TRUE; + return TRUE; +} + +/* Merge backend specific data from an object file to the output + object file when linking. */ + +bfd_boolean +_bfd_m68hc11_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd) +{ + flagword old_flags; + flagword new_flags; + bfd_boolean ok = TRUE; + + /* Check if we have the same endianness */ + if (!_bfd_generic_verify_endian_match (ibfd, obfd)) + return FALSE; + + if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour + || bfd_get_flavour (obfd) != bfd_target_elf_flavour) + return TRUE; + + new_flags = elf_elfheader (ibfd)->e_flags; + elf_elfheader (obfd)->e_flags |= new_flags & EF_M68HC11_ABI; + old_flags = elf_elfheader (obfd)->e_flags; + + if (! elf_flags_init (obfd)) + { + elf_flags_init (obfd) = TRUE; + elf_elfheader (obfd)->e_flags = new_flags; + elf_elfheader (obfd)->e_ident[EI_CLASS] + = elf_elfheader (ibfd)->e_ident[EI_CLASS]; + + if (bfd_get_arch (obfd) == bfd_get_arch (ibfd) + && bfd_get_arch_info (obfd)->the_default) + { + if (! bfd_set_arch_mach (obfd, bfd_get_arch (ibfd), + bfd_get_mach (ibfd))) + return FALSE; + } + + return TRUE; + } + + /* Check ABI compatibility. */ + if ((new_flags & E_M68HC11_I32) != (old_flags & E_M68HC11_I32)) + { + (*_bfd_error_handler) + (_("%B: linking files compiled for 16-bit integers (-mshort) " + "and others for 32-bit integers"), ibfd); + ok = FALSE; + } + if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64)) + { + (*_bfd_error_handler) + (_("%B: linking files compiled for 32-bit double (-fshort-double) " + "and others for 64-bit double"), ibfd); + ok = FALSE; + } + + /* Processor compatibility. */ + if (!EF_M68HC11_CAN_MERGE_MACH (new_flags, old_flags)) + { + (*_bfd_error_handler) + (_("%B: linking files compiled for HCS12 with " + "others compiled for HC12"), ibfd); + ok = FALSE; + } + new_flags = ((new_flags & ~EF_M68HC11_MACH_MASK) + | (EF_M68HC11_MERGE_MACH (new_flags, old_flags))); + + elf_elfheader (obfd)->e_flags = new_flags; + + new_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK); + old_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK); + + /* Warn about any other mismatches */ + if (new_flags != old_flags) + { + (*_bfd_error_handler) + (_("%B: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"), + ibfd, (unsigned long) new_flags, (unsigned long) old_flags); + ok = FALSE; + } + + if (! ok) + { + bfd_set_error (bfd_error_bad_value); + return FALSE; + } + + return TRUE; +} + +bfd_boolean +_bfd_m68hc11_elf_print_private_bfd_data (bfd *abfd, void *ptr) +{ + FILE *file = (FILE *) ptr; + + BFD_ASSERT (abfd != NULL && ptr != NULL); + + /* Print normal ELF private data. */ + _bfd_elf_print_private_bfd_data (abfd, ptr); + + /* xgettext:c-format */ + fprintf (file, _("private flags = %lx:"), elf_elfheader (abfd)->e_flags); + + if (elf_elfheader (abfd)->e_flags & E_M68HC11_I32) + fprintf (file, _("[abi=32-bit int, ")); + else + fprintf (file, _("[abi=16-bit int, ")); + + if (elf_elfheader (abfd)->e_flags & E_M68HC11_F64) + fprintf (file, _("64-bit double, ")); + else + fprintf (file, _("32-bit double, ")); + + if (strcmp (bfd_get_target (abfd), "elf32-m68hc11") == 0) + fprintf (file, _("cpu=HC11]")); + else if (elf_elfheader (abfd)->e_flags & EF_M68HCS12_MACH) + fprintf (file, _("cpu=HCS12]")); + else + fprintf (file, _("cpu=HC12]")); + + if (elf_elfheader (abfd)->e_flags & E_M68HC12_BANKS) + fprintf (file, _(" [memory=bank-model]")); + else + fprintf (file, _(" [memory=flat]")); + + if (elf_elfheader (abfd)->e_flags & E_M68HC11_XGATE_RAMOFFSET) + fprintf (file, _(" [XGATE RAM offsetting]")); + + fputc ('\n', file); + + return TRUE; +} + +static void scan_sections_for_abi (bfd *abfd ATTRIBUTE_UNUSED, + asection *asect, void *arg) +{ + struct m68hc11_scan_param* p = (struct m68hc11_scan_param*) arg; + + if (asect->vma >= p->pinfo->bank_virtual) + p->use_memory_banks = TRUE; +} + +/* Tweak the OSABI field of the elf header. */ + +void +elf32_m68hc11_post_process_headers (bfd *abfd, struct bfd_link_info *link_info) +{ + struct m68hc11_scan_param param; + struct m68hc11_elf_link_hash_table *htab; + + if (link_info == NULL) + return; + + htab = m68hc11_elf_hash_table (link_info); + if (htab == NULL) + return; + + m68hc11_elf_get_bank_parameters (link_info); + + param.use_memory_banks = FALSE; + param.pinfo = & htab->pinfo; + + bfd_map_over_sections (abfd, scan_sections_for_abi, ¶m); + + if (param.use_memory_banks) + { + Elf_Internal_Ehdr * i_ehdrp; + + i_ehdrp = elf_elfheader (abfd); + i_ehdrp->e_flags |= E_M68HC12_BANKS; + } +} |