#include "bfd.h"
#include "sysdep.h"
+#include "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/m68hc11.h"
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
-PARAMS ((bfd * abfd, bfd_reloc_code_real_type code));
+ PARAMS ((bfd *, bfd_reloc_code_real_type));
static void m68hc11_info_to_howto_rel
-PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
+ PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
static bfd_reloc_status_type m68hc11_elf_ignore_reloc
-PARAMS ((bfd *abfd, arelent *reloc_entry,
- asymbol *symbol, PTR data, asection *input_section,
- bfd *output_bfd, char **error_message));
+ PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
/* GC mark and sweep. */
static asection *elf32_m68hc11_gc_mark_hook
-PARAMS ((bfd *abfd, struct bfd_link_info *info,
- Elf_Internal_Rela *rel, struct elf_link_hash_entry *h,
- Elf_Internal_Sym *sym));
+ PARAMS ((asection *, struct bfd_link_info *, Elf_Internal_Rela *,
+ struct elf_link_hash_entry *, Elf_Internal_Sym *));
static boolean elf32_m68hc11_gc_sweep_hook
-PARAMS ((bfd *abfd, struct bfd_link_info *info,
- asection *sec, const Elf_Internal_Rela *relocs));
-
-boolean _bfd_m68hc11_elf_merge_private_bfd_data PARAMS ((bfd*, bfd*));
-boolean _bfd_m68hc11_elf_set_private_flags PARAMS ((bfd*, flagword));
-boolean _bfd_m68hc11_elf_print_private_bfd_data PARAMS ((bfd*, PTR));
+ PARAMS ((bfd *, struct bfd_link_info *, asection *,
+ const Elf_Internal_Rela *));
+static boolean elf32_m68hc11_check_relocs
+ PARAMS ((bfd *, struct bfd_link_info *, asection *,
+ const Elf_Internal_Rela *));
+static boolean elf32_m68hc11_relocate_section
+ PARAMS ((bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
+ Elf_Internal_Rela *, Elf_Internal_Sym *, asection **));
+static boolean m68hc11_elf_relax_section
+ PARAMS ((bfd *, asection *, struct bfd_link_info *, boolean *));
+static void m68hc11_elf_relax_delete_bytes
+ PARAMS ((bfd *, asection *, bfd_vma, int));
+static void m68hc11_relax_group
+ PARAMS ((bfd *, asection *, bfd_byte *, unsigned,
+ unsigned long, unsigned long));
+static int compare_reloc PARAMS ((const void *, const void *));
+
+
+boolean _bfd_m68hc11_elf_merge_private_bfd_data PARAMS ((bfd *, bfd *));
+boolean _bfd_m68hc11_elf_set_private_flags PARAMS ((bfd *, flagword));
+boolean _bfd_m68hc11_elf_print_private_bfd_data PARAMS ((bfd *, PTR));
/* Use REL instead of RELA to save space */
#define USE_REL
}
static asection *
-elf32_m68hc11_gc_mark_hook (abfd, info, rel, h, sym)
- bfd *abfd;
+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;
}
}
else
- {
- if (!(elf_bad_symtab (abfd)
- && ELF_ST_BIND (sym->st_info) != STB_LOCAL)
- && !((sym->st_shndx <= 0 || sym->st_shndx >= SHN_LORESERVE)
- && sym->st_shndx != SHN_COMMON))
- {
- return bfd_section_from_elf_index (abfd, sym->st_shndx);
- }
- }
+ return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
+
return NULL;
}
return true;
}
+struct m68hc11_direct_relax
+{
+ const char *name;
+ unsigned char code;
+ unsigned char direct_code;
+} m68hc11_direct_relax_table[] = {
+ { "adca", 0xB9, 0x99 },
+ { "adcb", 0xF9, 0xD9 },
+ { "adda", 0xBB, 0x9B },
+ { "addb", 0xFB, 0xDB },
+ { "addd", 0xF3, 0xD3 },
+ { "anda", 0xB4, 0x94 },
+ { "andb", 0xF4, 0xD4 },
+ { "cmpa", 0xB1, 0x91 },
+ { "cmpb", 0xF1, 0xD1 },
+ { "cpd", 0xB3, 0x93 },
+ { "cpxy", 0xBC, 0x9C },
+/* { "cpy", 0xBC, 0x9C }, */
+ { "eora", 0xB8, 0x98 },
+ { "eorb", 0xF8, 0xD8 },
+ { "jsr", 0xBD, 0x9D },
+ { "ldaa", 0xB6, 0x96 },
+ { "ldab", 0xF6, 0xD6 },
+ { "ldd", 0xFC, 0xDC },
+ { "lds", 0xBE, 0x9E },
+ { "ldxy", 0xFE, 0xDE },
+ /* { "ldy", 0xFE, 0xDE },*/
+ { "oraa", 0xBA, 0x9A },
+ { "orab", 0xFA, 0xDA },
+ { "sbca", 0xB2, 0x92 },
+ { "sbcb", 0xF2, 0xD2 },
+ { "staa", 0xB7, 0x97 },
+ { "stab", 0xF7, 0xD7 },
+ { "std", 0xFD, 0xDD },
+ { "sts", 0xBF, 0x9F },
+ { "stxy", 0xFF, 0xDF },
+ /* { "sty", 0xFF, 0xDF },*/
+ { "suba", 0xB0, 0x90 },
+ { "subb", 0xF0, 0xD0 },
+ { "subd", 0xB3, 0x93 },
+ { 0, 0, 0 }
+};
+
+static struct m68hc11_direct_relax *
+find_relaxable_insn (unsigned char code)
+{
+ int i;
+
+ for (i = 0; m68hc11_direct_relax_table[i].name; i++)
+ if (m68hc11_direct_relax_table[i].code == code)
+ return &m68hc11_direct_relax_table[i];
+
+ return 0;
+}
+
+static int
+compare_reloc (e1, e2)
+ const void *e1;
+ const void *e2;
+{
+ const Elf_Internal_Rela *i1 = (const Elf_Internal_Rela *) e1;
+ const Elf_Internal_Rela *i2 = (const Elf_Internal_Rela *) e2;
+
+ if (i1->r_offset == i2->r_offset)
+ return 0;
+ else
+ return i1->r_offset < i2->r_offset ? -1 : 1;
+}
+
+#define M6811_OP_LDX_IMMEDIATE (0xCE)
+
+static void
+m68hc11_relax_group (abfd, sec, contents, value, offset, end_group)
+ bfd *abfd;
+ asection *sec;
+ bfd_byte *contents;
+ unsigned value;
+ unsigned long offset;
+ unsigned long end_group;
+{
+ unsigned char code;
+ unsigned long start_offset;
+ unsigned long ldx_offset = offset;
+ unsigned long ldx_size;
+ int can_delete_ldx;
+ int relax_ldy = 0;
+
+ /* First instruction of the relax group must be a
+ LDX #value or LDY #value. If this is not the case,
+ ignore the relax group. */
+ code = bfd_get_8 (abfd, contents + offset);
+ if (code == 0x18)
+ {
+ relax_ldy++;
+ offset++;
+ code = bfd_get_8 (abfd, contents + offset);
+ }
+ ldx_size = offset - ldx_offset + 3;
+ offset += 3;
+ if (code != M6811_OP_LDX_IMMEDIATE || offset >= end_group)
+ return;
+
+
+ /* We can remove the LDX/LDY only when all bset/brclr instructions
+ of the relax group have been converted to use direct addressing
+ mode. */
+ can_delete_ldx = 1;
+ while (offset < end_group)
+ {
+ unsigned isize;
+ unsigned new_value;
+ int bset_use_y;
+
+ bset_use_y = 0;
+ start_offset = offset;
+ code = bfd_get_8 (abfd, contents + offset);
+ if (code == 0x18)
+ {
+ bset_use_y++;
+ offset++;
+ code = bfd_get_8 (abfd, contents + offset);
+ }
+
+ /* Check the instruction and translate to use direct addressing mode. */
+ switch (code)
+ {
+ /* bset */
+ case 0x1C:
+ code = 0x14;
+ isize = 3;
+ break;
+
+ /* brclr */
+ case 0x1F:
+ code = 0x13;
+ isize = 4;
+ break;
+
+ /* brset */
+ case 0x1E:
+ code = 0x12;
+ isize = 4;
+ break;
+
+ /* bclr */
+ case 0x1D:
+ code = 0x15;
+ isize = 3;
+ break;
+
+ /* This instruction is not recognized and we are not
+ at end of the relax group. Ignore and don't remove
+ the first LDX (we don't know what it is used for...). */
+ default:
+ return;
+ }
+ new_value = (unsigned) bfd_get_8 (abfd, contents + offset + 1);
+ new_value += value;
+ if ((new_value & 0xff00) == 0 && bset_use_y == relax_ldy)
+ {
+ bfd_put_8 (abfd, code, contents + offset);
+ bfd_put_8 (abfd, new_value, contents + offset + 1);
+ if (start_offset != offset)
+ {
+ m68hc11_elf_relax_delete_bytes (abfd, sec, start_offset,
+ offset - start_offset);
+ end_group--;
+ }
+ }
+ else
+ {
+ can_delete_ldx = 0;
+ }
+ offset = start_offset + isize;
+ }
+ if (can_delete_ldx)
+ {
+ /* Remove the move instruction (3 or 4 bytes win). */
+ m68hc11_elf_relax_delete_bytes (abfd, sec, ldx_offset, ldx_size);
+ }
+}
+
+/* This function handles relaxing for the 68HC11.
+
+
+ and somewhat more difficult to support. */
+
+static boolean
+m68hc11_elf_relax_section (abfd, sec, link_info, again)
+ bfd *abfd;
+ asection *sec;
+ struct bfd_link_info *link_info;
+ boolean *again;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Shdr *shndx_hdr;
+ Elf_Internal_Rela *internal_relocs;
+ Elf_Internal_Rela *free_relocs = NULL;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_byte *contents = NULL;
+ bfd_byte *free_contents = NULL;
+ Elf32_External_Sym *extsyms = NULL;
+ Elf32_External_Sym *free_extsyms = NULL;
+ Elf_Internal_Rela *prev_insn_branch = NULL;
+ Elf_Internal_Rela *prev_insn_group = NULL;
+ unsigned insn_group_value = 0;
+ Elf_External_Sym_Shndx *shndx_buf = NULL;
+
+ /* Assume nothing changes. */
+ *again = false;
+
+ /* We don't have to do anything for a relocateable link, if
+ this section does not have relocs, or if this is not a
+ code section. */
+ if (link_info->relocateable
+ || (sec->flags & SEC_RELOC) == 0
+ || sec->reloc_count == 0
+ || (sec->flags & SEC_CODE) == 0)
+ return true;
+
+ /* If this is the first time we have been called for this section,
+ initialize the cooked size. */
+ if (sec->_cooked_size == 0)
+ sec->_cooked_size = sec->_raw_size;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+
+ /* Get a copy of the native relocations. */
+ internal_relocs = (_bfd_elf32_link_read_relocs
+ (abfd, sec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
+ link_info->keep_memory));
+ if (internal_relocs == NULL)
+ goto error_return;
+ if (! link_info->keep_memory)
+ free_relocs = internal_relocs;
+
+ /* Checking for branch relaxation relies on the relocations to
+ be sorted on 'r_offset'. This is not guaranteed so we must sort. */
+ qsort (internal_relocs, sec->reloc_count, sizeof (Elf_Internal_Rela),
+ compare_reloc);
+
+ /* Walk through them looking for relaxing opportunities. */
+ irelend = internal_relocs + sec->reloc_count;
+ for (irel = internal_relocs; irel < irelend; irel++)
+ {
+ bfd_vma symval;
+ bfd_vma value;
+ Elf_Internal_Sym isym;
+
+ /* If this isn't something that can be relaxed, then ignore
+ this reloc. */
+ if (ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_16
+ && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_JUMP
+ && ELF32_R_TYPE (irel->r_info) != (int) R_M68HC11_RL_GROUP)
+ {
+ prev_insn_branch = 0;
+ prev_insn_group = 0;
+ 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
+ {
+ /* Go get them off disk. */
+ contents = (bfd_byte *) bfd_malloc (sec->_raw_size);
+ if (contents == NULL)
+ goto error_return;
+ free_contents = contents;
+
+ if (! bfd_get_section_contents (abfd, sec, contents,
+ (file_ptr) 0, sec->_raw_size))
+ goto error_return;
+ }
+ }
+
+ /* Try to eliminate an unconditional 8 bit pc-relative branch
+ which immediately follows a conditional 8 bit pc-relative
+ branch around the unconditional branch.
+
+ original: new:
+ bCC lab1 bCC' lab2
+ bra lab2
+ lab1: lab1:
+
+ This happens when the bCC can't reach lab2 at assembly time,
+ but due to other relaxations it can reach at link time. */
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_JUMP)
+ {
+ Elf_Internal_Rela *nrel;
+ unsigned char code;
+ unsigned char roffset;
+
+ prev_insn_branch = 0;
+ prev_insn_group = 0;
+
+ /* Do nothing if this reloc is the last byte in the section. */
+ if (irel->r_offset == sec->_cooked_size)
+ continue;
+
+ /* See if the next instruction is an unconditional pc-relative
+ branch, more often than not this test will fail, so we
+ test it first to speed things up. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset + 2);
+ if (code != 0x7e)
+ continue;
+
+ /* Also make sure the next relocation applies to the next
+ instruction and that it's a pc-relative 8 bit branch. */
+ nrel = irel + 1;
+ if (nrel == irelend
+ || irel->r_offset + 3 != nrel->r_offset
+ || ELF32_R_TYPE (nrel->r_info) != (int) R_M68HC11_16)
+ continue;
+
+ /* Make sure our destination immediately follows the
+ unconditional branch. */
+ roffset = bfd_get_8 (abfd, contents + irel->r_offset + 1);
+ if (roffset != 3)
+ continue;
+
+ prev_insn_branch = irel;
+ prev_insn_group = 0;
+ continue;
+ }
+
+ /* Read this BFD's symbols if we haven't done so already. */
+ if (extsyms == NULL)
+ {
+ /* Get cached copy if it exists. */
+ if (symtab_hdr->contents != NULL)
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+ else
+ {
+ /* Go get them off disk. */
+ bfd_size_type amt = symtab_hdr->sh_size;
+ extsyms = (Elf32_External_Sym *) bfd_malloc (amt);
+ if (extsyms == NULL)
+ goto error_return;
+ free_extsyms = extsyms;
+ if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
+ || bfd_bread ((PTR) extsyms, amt, abfd) != amt)
+ goto error_return;
+ }
+
+ if (shndx_hdr->sh_size != 0)
+ {
+ bfd_size_type amt;
+
+ amt = symtab_hdr->sh_info * sizeof (Elf_External_Sym_Shndx);
+ shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
+ if (shndx_buf == NULL)
+ goto error_return;
+ if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
+ || bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
+ goto error_return;
+ shndx_hdr->contents = (PTR) shndx_buf;
+ }
+ }
+
+ /* Get the value of the symbol referred to by the reloc. */
+ if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
+ {
+ Elf32_External_Sym *esym;
+ Elf_External_Sym_Shndx *shndx;
+ asection *sym_sec;
+
+ /* A local symbol. */
+ esym = extsyms + ELF32_R_SYM (irel->r_info);
+ shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0);
+ bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym);
+
+ 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. */
+ prev_insn_branch = 0;
+ prev_insn_group = 0;
+ continue;
+ }
+
+ symval = (h->root.u.def.value
+ + h->root.u.def.section->output_section->vma
+ + h->root.u.def.section->output_offset);
+ }
+
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_RL_GROUP)
+ {
+ prev_insn_branch = 0;
+ prev_insn_group = 0;
+
+ /* Do nothing if this reloc is the last byte in the section. */
+ if (irel->r_offset == sec->_cooked_size)
+ continue;
+
+ prev_insn_group = irel;
+ insn_group_value = isym.st_value;
+ continue;
+ }
+
+ value = symval;
+ /* Try to turn a far branch to a near branch. */
+ if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
+ && prev_insn_branch)
+ {
+ bfd_vma offset;
+ unsigned char code;
+
+ offset = value - (prev_insn_branch->r_offset
+ + sec->output_section->vma
+ + sec->output_offset + 2);
+
+ /* If the offset is still out of -128..+127 range,
+ leave that far branch unchanged. */
+ if ((offset & 0xff80) != 0 && (offset & 0xff80) != 0xff80)
+ {
+ prev_insn_branch = 0;
+ continue;
+ }
+
+ /* Shrink the branch. */
+ code = bfd_get_8 (abfd, contents + prev_insn_branch->r_offset);
+ if (code == 0x7e)
+ {
+ code = 0x20;
+ bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
+ bfd_put_8 (abfd, offset,
+ contents + prev_insn_branch->r_offset + 1);
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_M68HC11_NONE);
+ m68hc11_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset, 1);
+ }
+ else
+ {
+ code ^= 0x1;
+ bfd_put_8 (abfd, code, contents + prev_insn_branch->r_offset);
+ bfd_put_8 (abfd, offset,
+ contents + prev_insn_branch->r_offset + 1);
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_M68HC11_NONE);
+ m68hc11_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset - 1, 3);
+ }
+ prev_insn_branch = 0;
+ }
+
+ /* Try to turn a 16 bit address into a 8 bit page0 address. */
+ else if (ELF32_R_TYPE (irel->r_info) == (int) R_M68HC11_16
+ && (value & 0xff00) == 0)
+ {
+ unsigned char code;
+ unsigned short offset;
+ struct m68hc11_direct_relax *rinfo;
+
+ prev_insn_branch = 0;
+ offset = bfd_get_16 (abfd, contents + irel->r_offset);
+ offset += value;
+ if ((offset & 0xff00) != 0)
+ {
+ prev_insn_group = 0;
+ continue;
+ }
+
+ if (prev_insn_group)
+ {
+ /* Note that we've changed the reldection contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ m68hc11_relax_group (abfd, sec, contents, offset,
+ prev_insn_group->r_offset,
+ insn_group_value);
+ irel = prev_insn_group;
+ prev_insn_group = 0;
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_M68HC11_NONE);
+ continue;
+ }
+
+ /* Get the opcode. */
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+ rinfo = find_relaxable_insn (code);
+ if (rinfo == 0)
+ {
+ prev_insn_group = 0;
+ continue;
+ }
+
+ /* Note that we've changed the reldection contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Fix the opcode. */
+ /* printf ("A relaxable case : 0x%02x (%s)\n",
+ code, rinfo->name); */
+ bfd_put_8 (abfd, rinfo->direct_code,
+ contents + irel->r_offset - 1);
+
+ /* Delete one byte of data (upper byte of address). */
+ m68hc11_elf_relax_delete_bytes (abfd, sec, irel->r_offset, 1);
+
+ /* Fix the relocation's type. */
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_M68HC11_8);
+
+ /* That will change things, so, we should relax again.
+ Note that this is not required, and it may be slow. */
+ *again = true;
+ }
+ else if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_16)
+ {
+ unsigned char code;
+ bfd_vma offset;
+
+ prev_insn_branch = 0;
+ code = bfd_get_8 (abfd, contents + irel->r_offset - 1);
+ if (code == 0x7e)
+ {
+ offset = value - (irel->r_offset
+ + sec->output_section->vma
+ + sec->output_offset + 1);
+ offset += bfd_get_16 (abfd, contents + irel->r_offset);
+
+ /* If the offset is still out of -128..+127 range,
+ leave that far branch unchanged. */
+ if ((offset & 0xff80) == 0 || (offset & 0xff80) == 0xff80)
+ {
+
+ /* Note that we've changed the reldection contents, etc. */
+ elf_section_data (sec)->relocs = internal_relocs;
+ free_relocs = NULL;
+
+ elf_section_data (sec)->this_hdr.contents = contents;
+ free_contents = NULL;
+
+ symtab_hdr->contents = (bfd_byte *) extsyms;
+ free_extsyms = NULL;
+
+ /* Shrink the branch. */
+ code = 0x20;
+ bfd_put_8 (abfd, code,
+ contents + irel->r_offset - 1);
+ bfd_put_8 (abfd, offset,
+ contents + irel->r_offset);
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_M68HC11_NONE);
+ m68hc11_elf_relax_delete_bytes (abfd, sec,
+ irel->r_offset + 1, 1);
+ }
+ }
+ }
+ prev_insn_branch = 0;
+ }
+
+ if (free_relocs != NULL)
+ {
+ free (free_relocs);
+ free_relocs = NULL;
+ }
+
+ if (free_contents != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_contents);
+ else
+ {
+ /* Cache the section contents for elf_link_input_bfd. */
+ elf_section_data (sec)->this_hdr.contents = contents;
+ }
+ free_contents = NULL;
+ }
+
+ if (free_extsyms != NULL)
+ {
+ if (! link_info->keep_memory)
+ free (free_extsyms);
+ else
+ {
+ /* Cache the symbols for elf_link_input_bfd. */
+ symtab_hdr->contents = (unsigned char *) extsyms;
+ }
+ free_extsyms = NULL;
+ }
+
+ return true;
+
+ error_return:
+ if (free_relocs != NULL)
+ free (free_relocs);
+ if (free_contents != NULL)
+ free (free_contents);
+ if (free_extsyms != NULL)
+ free (free_extsyms);
+ return false;
+}
+
+/* Delete some bytes from a section while relaxing. */
+
+static void
+m68hc11_elf_relax_delete_bytes (abfd, sec, addr, count)
+ bfd *abfd;
+ asection *sec;
+ bfd_vma addr;
+ int count;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ Elf_Internal_Shdr *shndx_hdr;
+ Elf32_External_Sym *extsyms;
+ unsigned int sec_shndx;
+ Elf_External_Sym_Shndx *shndx;
+ bfd_byte *contents;
+ Elf_Internal_Rela *irel, *irelend;
+ bfd_vma toaddr;
+ Elf32_External_Sym *esym, *esymend;
+ struct elf_link_hash_entry **sym_hashes;
+ struct elf_link_hash_entry **end_hashes;
+ unsigned int symcount;
+
+ symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
+ extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
+
+ sec_shndx = _bfd_elf_section_from_bfd_section (abfd, sec);
+
+ contents = elf_section_data (sec)->this_hdr.contents;
+
+ toaddr = sec->_cooked_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->_cooked_size -= count;
+
+ /* Adjust all the relocs. */
+ for (irel = elf_section_data (sec)->relocs; irel < irelend; irel++)
+ {
+ unsigned char code;
+ unsigned char offset;
+ unsigned short raddr;
+ unsigned long old_offset;
+ int branch_pos;
+
+ old_offset = irel->r_offset;
+
+ /* See if this reloc was for the bytes we have deleted, in which
+ case we no longer care about it. Don't delete relocs which
+ represent addresses, though. */
+ if (ELF32_R_TYPE (irel->r_info) != R_M68HC11_RL_JUMP
+ && irel->r_offset >= addr && irel->r_offset < addr + count)
+ irel->r_info = ELF32_R_INFO (ELF32_R_SYM (irel->r_info),
+ R_M68HC11_NONE);
+
+ if (ELF32_R_TYPE (irel->r_info) == R_M68HC11_NONE)
+ continue;
+
+ /* Get the new reloc address. */
+ if ((irel->r_offset > addr
+ && irel->r_offset < toaddr))
+ irel->r_offset -= count;
+
+ /* If this is a PC relative reloc, see if the range it covers
+ includes the bytes we have deleted. */
+ switch (ELF32_R_TYPE (irel->r_info))
+ {
+ default:
+ break;
+
+ case R_M68HC11_RL_JUMP:
+ code = bfd_get_8 (abfd, contents + irel->r_offset);
+ switch (code)
+ {
+ /* jsr and jmp instruction are also marked with RL_JUMP
+ relocs but no adjustment must be made. */
+ case 0x7e:
+ case 0x9d:
+ case 0xbd:
+ continue;
+
+ case 0x12:
+ case 0x13:
+ branch_pos = 3;
+ raddr = 4;
+
+ /* Special case when we translate a brclr N,y into brclr *<addr>
+ In this case, the 0x18 page2 prefix is removed.
+ The reloc offset is not modified but the instruction
+ size is reduced by 1. */
+ if (old_offset == addr)
+ raddr++;
+ break;
+
+ case 0x1e:
+ case 0x1f:
+ branch_pos = 3;
+ raddr = 4;
+ break;
+
+ case 0x18:
+ branch_pos = 4;
+ raddr = 5;
+ break;
+
+ default:
+ branch_pos = 1;
+ raddr = 2;
+ break;
+ }
+ offset = bfd_get_8 (abfd, contents + irel->r_offset + branch_pos);
+ raddr += old_offset;
+ raddr += ((unsigned short) offset | ((offset & 0x80) ? 0xff00 : 0));
+ if (irel->r_offset < addr && raddr >= addr)
+ {
+ offset -= count;
+ bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
+ }
+ else if (irel->r_offset >= addr && raddr <= addr)
+ {
+ offset += count;
+ bfd_put_8 (abfd, offset, contents + irel->r_offset + branch_pos);
+ }
+ else
+ {
+ /*printf ("Not adjusted 0x%04x [0x%4x 0x%4x]\n", raddr,
+ irel->r_offset, addr);*/
+ }
+
+ break;
+ }
+ }
+
+ /* Adjust the local symbols defined in this section. */
+ shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
+ shndx = (Elf_External_Sym_Shndx *) shndx_hdr->contents;
+ esym = extsyms;
+ esymend = esym + symtab_hdr->sh_info;
+ for (; esym < esymend; esym++, shndx = (shndx ? shndx + 1 : NULL))
+ {
+ Elf_Internal_Sym isym;
+ Elf_External_Sym_Shndx dummy;
+
+ bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym);
+
+ if (isym.st_shndx == sec_shndx
+ && isym.st_value > addr
+ && isym.st_value < toaddr)
+ {
+ isym.st_value -= count;
+ bfd_elf32_swap_symbol_out (abfd, &isym, esym, &dummy);
+ }
+ }
+
+ /* 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;
+ }
+ }
+}
+
+/* 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 boolean
+elf32_m68hc11_check_relocs (abfd, info, sec, relocs)
+ bfd * abfd;
+ struct bfd_link_info * info;
+ asection * sec;
+ const Elf_Internal_Rela * relocs;
+{
+ Elf_Internal_Shdr * symtab_hdr;
+ struct elf_link_hash_entry ** sym_hashes;
+ struct elf_link_hash_entry ** sym_hashes_end;
+ const Elf_Internal_Rela * rel;
+ const Elf_Internal_Rela * rel_end;
+
+ if (info->relocateable)
+ return true;
+
+ symtab_hdr = & elf_tdata (abfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (abfd);
+ sym_hashes_end = sym_hashes + symtab_hdr->sh_size / sizeof (Elf32_External_Sym);
+ if (!elf_bad_symtab (abfd))
+ sym_hashes_end -= symtab_hdr->sh_info;
+
+ rel_end = relocs + sec->reloc_count;
+
+ for (rel = relocs; rel < rel_end; rel++)
+ {
+ struct elf_link_hash_entry * h;
+ unsigned long r_symndx;
+
+ r_symndx = ELF32_R_SYM (rel->r_info);
+
+ if (r_symndx < symtab_hdr->sh_info)
+ h = NULL;
+ else
+ h = sym_hashes [r_symndx - symtab_hdr->sh_info];
+
+ 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_elf32_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:
+ if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_addend))
+ return false;
+ break;
+ }
+ }
+
+ return true;
+}
+
+/* Relocate a 68hc11/68hc12 ELF section. */
+static boolean
+elf32_m68hc11_relocate_section (output_bfd, info, input_bfd, input_section,
+ contents, relocs, local_syms, local_sections)
+ bfd *output_bfd ATTRIBUTE_UNUSED;
+ struct bfd_link_info *info;
+ bfd *input_bfd;
+ asection *input_section;
+ bfd_byte *contents;
+ Elf_Internal_Rela *relocs;
+ Elf_Internal_Sym *local_syms;
+ asection **local_sections;
+{
+ Elf_Internal_Shdr *symtab_hdr;
+ struct elf_link_hash_entry **sym_hashes;
+ Elf_Internal_Rela *rel, *relend;
+ const char *name;
+
+ symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
+ sym_hashes = elf_sym_hashes (input_bfd);
+
+ rel = relocs;
+ relend = relocs + input_section->reloc_count;
+ for (; rel < relend; rel++)
+ {
+ int r_type;
+ 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;
+
+ 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;
+
+ howto = elf_m68hc11_howto_table + r_type;
+
+ if (info->relocateable)
+ {
+ /* This is a relocateable 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 (r_symndx < symtab_hdr->sh_info)
+ {
+ sym = local_syms + r_symndx;
+ if (ELF_ST_TYPE (sym->st_info) == STT_SECTION)
+ {
+ sec = local_sections[r_symndx];
+ rel->r_addend += sec->output_offset + sym->st_value;
+ }
+ }
+
+ continue;
+ }
+
+ /* This is a final link. */
+ 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);
+ }
+ 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;
+ if (h->root.type == bfd_link_hash_defined
+ || h->root.type == bfd_link_hash_defweak)
+ {
+ sec = h->root.u.def.section;
+ relocation = (h->root.u.def.value
+ + sec->output_section->vma
+ + sec->output_offset);
+ }
+ else if (h->root.type == bfd_link_hash_undefweak)
+ relocation = 0;
+ else
+ {
+ if (!((*info->callbacks->undefined_symbol)
+ (info, h->root.root.string, input_bfd,
+ input_section, rel->r_offset, true)))
+ return false;
+ relocation = 0;
+ }
+ }
+
+ 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);
+ }
+
+ 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, 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;
+}
+
+
\f
/* Set and control ELF flags in ELF header. */
#define elf_info_to_howto 0
#define elf_info_to_howto_rel m68hc11_info_to_howto_rel
+#define bfd_elf32_bfd_relax_section m68hc11_elf_relax_section
#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 0
#define elf_backend_final_write_processing 0
#define elf_backend_can_gc_sections 1
projects / deliverable / binutils-gdb.git / blobdiff