/* Motorola 68HC12-specific support for 32-bit ELF
- Copyright 1999, 2000, 2002 Free Software Foundation, Inc.
+ Copyright 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
Contributed by Stephane Carrez (stcarrez@nerim.fr)
(Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
#include "bfd.h"
#include "sysdep.h"
+#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
+#include "elf32-m68hc1x.h"
#include "elf/m68hc11.h"
#include "opcode/m68hc11.h"
+/* Relocation functions. */
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
- PARAMS ((bfd *, bfd_reloc_code_real_type));
+ (bfd *, bfd_reloc_code_real_type);
static void m68hc11_info_to_howto_rel
- PARAMS ((bfd *, arelent *, Elf_Internal_Rela *));
-
-static bfd_reloc_status_type m68hc11_elf_ignore_reloc
- PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
-static bfd_reloc_status_type m68hc12_elf_special_reloc
- PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
-static int m68hc12_addr_is_banked PARAMS ((bfd_vma));
-static bfd_vma m68hc12_phys_addr PARAMS ((bfd_vma));
-static bfd_vma m68hc12_phys_page PARAMS ((bfd_vma));
-
-/* GC mark and sweep. */
-static asection *elf32_m68hc11_gc_mark_hook
- PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
- struct elf_link_hash_entry *, Elf_Internal_Sym *));
-static bfd_boolean elf32_m68hc11_gc_sweep_hook
- PARAMS ((bfd *, struct bfd_link_info *, asection *,
- const Elf_Internal_Rela *));
-
-static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *));
-
-bfd_boolean _bfd_m68hc12_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
-bfd_boolean _bfd_m68hc12_elf_set_private_flags PARAMS ((bfd *, flagword));
-bfd_boolean _bfd_m68hc12_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
+ (bfd *, arelent *, Elf_Internal_Rela *);
+/* Trampoline generation. */
+static bfd_boolean m68hc12_elf_size_one_stub
+ (struct bfd_hash_entry *gen_entry, void *in_arg);
+static bfd_boolean m68hc12_elf_build_one_stub
+ (struct bfd_hash_entry *gen_entry, void *in_arg);
+static struct bfd_link_hash_table* m68hc12_elf_bfd_link_hash_table_create
+ (bfd*);
+static bfd_boolean m68hc12_elf_set_mach_from_flags PARAMS ((bfd *));
/* Use REL instead of RELA to save space */
#define USE_REL 1
-/* The Motorola 68HC11 microcontroler only addresses 64Kb.
- We must handle 8 and 16-bit relocations. The 32-bit relocation
- is defined but not used except by gas when -gstabs is used (which
- is wrong).
-
- The 68HC12 microcontroler has a memory bank switching system
+/* The 68HC12 microcontroler has a memory bank switching system
with a 16Kb window in the 64Kb address space. The extended memory
is mapped in the 16Kb window (at 0x8000). The page register controls
which 16Kb bank is mapped. The call/rtc instructions take care of
FALSE, /* partial_inplace */
0x00ff, /* src_mask */
0x00ff, /* dst_mask */
- FALSE), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
/* A 16 bit absolute relocation */
HOWTO (R_M68HC11_16, /* type */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont /*bitfield */ , /* complain_on_overflow */
- m68hc12_elf_special_reloc, /* special_function */
+ bfd_elf_generic_reloc, /* special_function */
"R_M68HC12_16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
0xffff, /* dst_mask */
- FALSE), /* pcrel_offset */
+ TRUE), /* pcrel_offset */
/* GNU extension to record C++ vtable hierarchy */
HOWTO (R_M68HC11_GNU_VTINHERIT, /* type */
/* A 24 bit relocation */
HOWTO (R_M68HC11_24, /* type */
0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
+ 2, /* size (0 = byte, 1 = short, 2 = long) */
24, /* bitsize */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- m68hc12_elf_special_reloc, /* special_function */
+ m68hc11_elf_special_reloc, /* special_function */
"R_M68HC12_24", /* name */
FALSE, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
+ 0xffffff, /* src_mask */
+ 0xffffff, /* dst_mask */
FALSE), /* pcrel_offset */
/* A 16-bit low relocation */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- m68hc12_elf_special_reloc,/* special_function */
+ m68hc11_elf_special_reloc,/* special_function */
"R_M68HC12_LO16", /* name */
FALSE, /* partial_inplace */
0xffff, /* src_mask */
FALSE, /* pc_relative */
0, /* bitpos */
complain_overflow_dont, /* complain_on_overflow */
- m68hc12_elf_special_reloc,/* special_function */
+ m68hc11_elf_special_reloc,/* special_function */
"R_M68HC12_PAGE", /* name */
FALSE, /* partial_inplace */
0x00ff, /* src_mask */
};
static reloc_howto_type *
-bfd_elf32_bfd_reloc_type_lookup (abfd, code)
- bfd *abfd ATTRIBUTE_UNUSED;
- bfd_reloc_code_real_type code;
+bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
+ bfd_reloc_code_real_type code)
{
unsigned int i;
return NULL;
}
-/* This function is used for relocs which are only used for relaxing,
- which the linker should otherwise ignore. */
-
-static bfd_reloc_status_type
-m68hc11_elf_ignore_reloc (abfd, reloc_entry, symbol, data, input_section,
- output_bfd, error_message)
- bfd *abfd ATTRIBUTE_UNUSED;
- arelent *reloc_entry;
- asymbol *symbol ATTRIBUTE_UNUSED;
- PTR 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;
-}
+/* Set the howto pointer for an M68HC11 ELF reloc. */
-static int
-m68hc12_addr_is_banked (addr)
- bfd_vma addr;
+static void
+m68hc11_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
+ arelent *cache_ptr, Elf_Internal_Rela *dst)
{
- return (addr >= M68HC12_BANK_VIRT) ? 1 : 0;
-}
+ unsigned int r_type;
-/* Return the physical address seen by the processor, taking
- into account banked memory. */
-static bfd_vma
-m68hc12_phys_addr (addr)
- bfd_vma addr;
-{
- if (addr < M68HC12_BANK_VIRT)
- return addr;
-
- /* Map the address to the memory bank. */
- addr -= M68HC12_BANK_VIRT;
- addr &= M68HC12_BANK_MASK;
- addr += M68HC12_BANK_BASE;
- return addr;
+ r_type = ELF32_R_TYPE (dst->r_info);
+ BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
+ cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
}
-/* Return the page number corresponding to an address in banked memory. */
-static bfd_vma
-m68hc12_phys_page (addr)
- bfd_vma addr;
-{
- if (addr < M68HC12_BANK_VIRT)
- return 0;
-
- /* Map the address to the memory bank. */
- addr -= M68HC12_BANK_VIRT;
- addr >>= M68HC12_BANK_SHIFT;
- addr &= M68HC12_BANK_PAGE_MASK;
- return addr;
-}
+\f
+/* Far trampoline generation. */
-static bfd_reloc_status_type
-m68hc12_elf_special_reloc (abfd, reloc_entry, symbol, data, input_section,
- output_bfd, error_message)
- bfd *abfd;
- arelent *reloc_entry;
- asymbol *symbol;
- PTR data;
- asection *input_section;
- bfd *output_bfd;
- char **error_message ATTRIBUTE_UNUSED;
+/* Build a 68HC12 trampoline stub. */
+static bfd_boolean
+m68hc12_elf_build_one_stub (struct bfd_hash_entry *gen_entry, void *in_arg)
{
- reloc_howto_type *howto;
- bfd_vma relocation;
- bfd_vma phys_addr;
- bfd_vma phys_page;
- bfd_vma insn_page;
- bfd_vma insn_addr;
-
- 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;
- }
+ struct elf32_m68hc11_stub_hash_entry *stub_entry;
+ struct bfd_link_info *info;
+ struct m68hc11_elf_link_hash_table *htab;
+ asection *stub_sec;
+ bfd *stub_bfd;
+ bfd_byte *loc;
+ bfd_vma sym_value, phys_page, phys_addr;
- if (output_bfd != NULL)
- return bfd_reloc_continue;
+ /* Massage our args to the form they really have. */
+ stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
+ info = (struct bfd_link_info *) in_arg;
- if (reloc_entry->address > input_section->_cooked_size)
- return bfd_reloc_outofrange;
+ htab = m68hc11_elf_hash_table (info);
- /* Compute relocation. */
- relocation = (symbol->value
- + symbol->section->output_section->vma
- + symbol->section->output_offset);
- relocation += reloc_entry->addend;
- relocation += bfd_get_16 (abfd, (bfd_byte*) data + reloc_entry->address);
+ stub_sec = stub_entry->stub_sec;
- /* Do the memory bank mapping. */
- phys_addr = m68hc12_phys_addr (relocation);
- phys_page = m68hc12_phys_page (relocation);
+ /* Make a note of the offset within the stubs for this entry. */
+ stub_entry->stub_offset = stub_sec->_raw_size;
+ stub_sec->_raw_size += 7;
+ loc = stub_sec->contents + stub_entry->stub_offset;
- howto = reloc_entry->howto;
- if (howto->complain_on_overflow != complain_overflow_dont
- && (phys_addr & (((bfd_vma) -1) << 16)))
- return bfd_reloc_overflow;
+ stub_bfd = stub_sec->owner;
- switch (howto->type)
- {
- case R_M68HC11_16:
- /* Get virtual address of instruction having the relocation. */
- insn_addr = input_section->output_section->vma
- + input_section->output_offset
- + reloc_entry->address;
-
- insn_page = m68hc12_phys_page (insn_addr);
-
- if (m68hc12_addr_is_banked (relocation)
- && m68hc12_addr_is_banked (insn_addr)
- && phys_page != insn_page)
- {
- *error_message = _("address is not in the same bank");
- return bfd_reloc_dangerous;
- }
- if (m68hc12_addr_is_banked (relocation)
- && !m68hc12_addr_is_banked (insn_addr))
- {
- *error_message = _("reference to a banked address in "
- "the normal address space");
- return bfd_reloc_dangerous;
- }
-
- case R_M68HC11_LO16:
- bfd_put_16 (abfd, phys_addr, (bfd_byte*) data + reloc_entry->address);
- break;
+ /* Create the trampoline call stub:
- case R_M68HC11_24:
- bfd_put_16 (abfd, phys_addr, (bfd_byte*) data + reloc_entry->address);
- bfd_put_8 (abfd, phys_page, (bfd_byte*) data + reloc_entry->address + 2);
- break;
+ ldy #%addr(symbol)
+ call %page(symbol), __trampoline
- case R_M68HC11_PAGE:
- bfd_put_8 (abfd, phys_page, (bfd_byte*) data + reloc_entry->address);
- break;
+ */
+ sym_value = (stub_entry->target_value
+ + stub_entry->target_section->output_offset
+ + stub_entry->target_section->output_section->vma);
+ phys_addr = m68hc11_phys_addr (&htab->pinfo, sym_value);
+ phys_page = m68hc11_phys_page (&htab->pinfo, sym_value);
- default:
- abort ();
- break;
- }
+ /* ldy #%page(sym) */
+ bfd_put_8 (stub_bfd, 0xCD, loc);
+ bfd_put_16 (stub_bfd, phys_addr, loc + 1);
+ loc += 3;
- return bfd_reloc_ok;
+ /* call %page(sym), __trampoline */
+ bfd_put_8 (stub_bfd, 0x4a, loc);
+ bfd_put_16 (stub_bfd, htab->pinfo.trampoline_addr, loc + 1);
+ bfd_put_8 (stub_bfd, phys_page, loc + 3);
+
+ return TRUE;
}
-/* Set the howto pointer for an M68HC11 ELF reloc. */
+/* As above, but don't actually build the stub. Just bump offset so
+ we know stub section sizes. */
-static void
-m68hc11_info_to_howto_rel (abfd, cache_ptr, dst)
- bfd *abfd ATTRIBUTE_UNUSED;
- arelent *cache_ptr;
- Elf_Internal_Rela *dst;
+static bfd_boolean
+m68hc12_elf_size_one_stub (struct bfd_hash_entry *gen_entry,
+ void *in_arg ATTRIBUTE_UNUSED)
{
- unsigned int r_type;
+ struct elf32_m68hc11_stub_hash_entry *stub_entry;
- r_type = ELF32_R_TYPE (dst->r_info);
- BFD_ASSERT (r_type < (unsigned int) R_M68HC11_max);
- cache_ptr->howto = &elf_m68hc11_howto_table[r_type];
+ /* Massage our args to the form they really have. */
+ stub_entry = (struct elf32_m68hc11_stub_hash_entry *) gen_entry;
+
+ stub_entry->stub_sec->_raw_size += 7;
+ return TRUE;
}
-static asection *
-elf32_m68hc11_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;
+/* Create a 68HC12 ELF linker hash table. */
+
+static struct bfd_link_hash_table *
+m68hc12_elf_bfd_link_hash_table_create (bfd *abfd)
{
- 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);
+ struct m68hc11_elf_link_hash_table *ret;
- return NULL;
-}
+ ret = m68hc11_elf_hash_table_create (abfd);
+ if (ret == (struct m68hc11_elf_link_hash_table *) NULL)
+ return NULL;
-static bfd_boolean
-elf32_m68hc11_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 68hc11/68hc12. */
- return TRUE;
-}
+ ret->size_one_stub = m68hc12_elf_size_one_stub;
+ ret->build_one_stub = m68hc12_elf_build_one_stub;
+ return &ret->root.root;
+}
\f
static bfd_boolean
-m68hc12_elf_set_mach_from_flags (abfd)
- bfd *abfd;
+m68hc12_elf_set_mach_from_flags (bfd *abfd)
{
flagword flags = elf_elfheader (abfd)->e_flags;
return TRUE;
}
-/* Set and control ELF flags in ELF header. */
-
-bfd_boolean
-_bfd_m68hc12_elf_set_private_flags (abfd, flags)
- bfd *abfd;
- flagword flags;
+/* Specific sections:
+ - The .page0 is a data section that is mapped in [0x0000..0x00FF].
+ Page0 accesses are faster on the M68HC12.
+ - The .vectors is the section that represents the interrupt
+ vectors. */
+static struct bfd_elf_special_section const elf32_m68hc12_special_sections[]=
{
- BFD_ASSERT (!elf_flags_init (abfd)
- || elf_elfheader (abfd)->e_flags == flags);
-
- elf_elfheader (abfd)->e_flags = flags;
- elf_flags_init (abfd) = TRUE;
- return m68hc12_elf_set_mach_from_flags (abfd);
-}
-
-/* Merge backend specific data from an object file to the output
- object file when linking. */
-
-bfd_boolean
-_bfd_m68hc12_elf_merge_private_bfd_data (ibfd, obfd)
- bfd *ibfd;
- bfd *obfd;
-{
- flagword old_flags;
- flagword new_flags;
- bfd_boolean ok = TRUE;
-
- /* Check if we have the same endianess */
- 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;
- 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)
- (_("%s: linking files compiled for 16-bit integers (-mshort) "
- "and others for 32-bit integers"),
- bfd_archive_filename (ibfd));
- ok = FALSE;
- }
- if ((new_flags & E_M68HC11_F64) != (old_flags & E_M68HC11_F64))
- {
- (*_bfd_error_handler)
- (_("%s: linking files compiled for 32-bit double (-fshort-double) "
- "and others for 64-bit double"),
- bfd_archive_filename (ibfd));
- ok = FALSE;
- }
-
- /* Processor compatibility. */
- if (!EF_M68HC11_CAN_MERGE_MACH (new_flags, old_flags))
- {
- (*_bfd_error_handler)
- (_("%s: linking files compiled for HCS12 with "
- "others compiled for HC12"),
- bfd_archive_filename (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;
-
- /* Warn about any other mismatches */
- new_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK);
- old_flags &= ~(EF_M68HC11_ABI | EF_M68HC11_MACH_MASK);
- if (new_flags != old_flags)
- {
- (*_bfd_error_handler)
- (_("%s: uses different e_flags (0x%lx) fields than previous modules (0x%lx)"),
- bfd_archive_filename (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_m68hc12_elf_print_private_bfd_data (abfd, ptr)
- bfd *abfd;
- PTR 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 (elf_elfheader (abfd)->e_flags & EF_M68HCS12_MACH)
- fprintf (file, _(" cpu=HCS12]"));
- else
- fprintf (file, _(" cpu=HC12]"));
- fputc ('\n', file);
-
- return TRUE;
-}
-
+ { ".eeprom", 7, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
+ { ".softregs", 9, 0, SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
+ { ".page0", 6, 0, SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
+ { ".vectors", 8, 0, SHT_PROGBITS, SHF_ALLOC },
+ { NULL, 0, 0, 0, 0 }
+};
+\f
#define ELF_ARCH bfd_arch_m68hc12
#define ELF_MACHINE_CODE EM_68HC12
#define ELF_MAXPAGESIZE 0x1000
#define elf_info_to_howto_rel m68hc11_info_to_howto_rel
#define elf_backend_gc_mark_hook elf32_m68hc11_gc_mark_hook
#define elf_backend_gc_sweep_hook elf32_m68hc11_gc_sweep_hook
+#define elf_backend_check_relocs elf32_m68hc11_check_relocs
+#define elf_backend_relocate_section elf32_m68hc11_relocate_section
#define elf_backend_object_p m68hc12_elf_set_mach_from_flags
#define elf_backend_final_write_processing 0
-/* Disabled as this backend uses the generic linker. */
-#define elf_backend_can_gc_sections 0
-
+#define elf_backend_can_gc_sections 1
+#define elf_backend_special_sections elf32_m68hc12_special_sections
+#define elf_backend_post_process_headers elf32_m68hc11_post_process_headers
+#define elf_backend_add_symbol_hook elf32_m68hc11_add_symbol_hook
+
+#define bfd_elf32_bfd_link_hash_table_create \
+ m68hc12_elf_bfd_link_hash_table_create
+#define bfd_elf32_bfd_link_hash_table_free \
+ m68hc11_elf_bfd_link_hash_table_free
#define bfd_elf32_bfd_merge_private_bfd_data \
- _bfd_m68hc12_elf_merge_private_bfd_data
-#define bfd_elf32_bfd_set_private_flags _bfd_m68hc12_elf_set_private_flags
+ _bfd_m68hc11_elf_merge_private_bfd_data
+#define bfd_elf32_bfd_set_private_flags _bfd_m68hc11_elf_set_private_flags
#define bfd_elf32_bfd_print_private_bfd_data \
- _bfd_m68hc12_elf_print_private_bfd_data
+ _bfd_m68hc11_elf_print_private_bfd_data
#include "elf32-target.h"
projects / deliverable / binutils-gdb.git / blobdiff