elf32-sparc.c

来自「基于4个mips核的noc设计」· C语言 代码 · 共 2,014 行 · 第 1/5 页

		      && (r_type == R_SPARC_8
			  || r_type == R_SPARC_16
			  || r_type == R_SPARC_32
			  || r_type == R_SPARC_DISP8
			  || r_type == R_SPARC_DISP16
			  || r_type == R_SPARC_DISP32
			  || r_type == R_SPARC_WDISP30
			  || r_type == R_SPARC_WDISP22
			  || r_type == R_SPARC_WDISP19
			  || r_type == R_SPARC_WDISP16
			  || r_type == R_SPARC_HI22
			  || r_type == R_SPARC_22
			  || r_type == R_SPARC_13
			  || r_type == R_SPARC_LO10
			  || r_type == R_SPARC_UA16
			  || r_type == R_SPARC_UA32
			  || r_type == R_SPARC_UA64
			  || ((r_type == R_SPARC_PC10
			       || r_type == R_SPARC_PC22)
			      && strcmp (h->root.root.string,
					 "_GLOBAL_OFFSET_TABLE_") != 0))))
		{
		  /* In these cases, we don't need the relocation
                     value.  We check specially because in some
                     obscure cases sec->output_section will be NULL.  */
		  relocation = 0;
		}
	      else
		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->shared && !info->symbolic
		   && !info->no_undefined
		   && ELF_ST_VISIBILITY (h->other) == STV_DEFAULT)
	    relocation = 0;
	  else
	    {
	      if (! ((*info->callbacks->undefined_symbol)
		     (info, h->root.root.string, input_bfd,
		      input_section, rel->r_offset,
		      (!info->shared || info->no_undefined
		       || ELF_ST_VISIBILITY (h->other)))))
		return false;
	      relocation = 0;
	    }
	}

      switch (r_type)
	{
	case R_SPARC_GOT10:
	case R_SPARC_GOT13:
	case R_SPARC_GOT22:
	  /* Relocation is to the entry for this symbol in the global
             offset table.  */
	  if (sgot == NULL)
	    {
	      sgot = bfd_get_section_by_name (dynobj, ".got");
	      BFD_ASSERT (sgot != NULL);
	    }

	  if (h != NULL)
	    {
	      bfd_vma off;

	      off = h->got.offset;
	      BFD_ASSERT (off != (bfd_vma) -1);

	      if (! elf_hash_table (info)->dynamic_sections_created
		  || (info->shared
		      && (info->symbolic || h->dynindx == -1)
		      && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR)))
		{
		  /* This is actually a static link, or it is a
                     -Bsymbolic link and the symbol is defined
                     locally, or the symbol was forced to be local
                     because of a version file.  We must initialize
                     this entry in the global offset table.  Since the
                     offset must always be a multiple of 4, we use the
                     least significant bit to record whether we have
                     initialized it already.

		     When doing a dynamic link, we create a .rela.got
		     relocation entry to initialize the value.  This
		     is done in the finish_dynamic_symbol routine.  */
		  if ((off & 1) != 0)
		    off &= ~1;
		  else
		    {
		      bfd_put_32 (output_bfd, relocation,
				  sgot->contents + off);
		      h->got.offset |= 1;
		    }
		}

	      relocation = sgot->output_offset + off - got_base;
	    }
	  else
	    {
	      bfd_vma off;

	      BFD_ASSERT (local_got_offsets != NULL
			  && local_got_offsets[r_symndx] != (bfd_vma) -1);

	      off = local_got_offsets[r_symndx];

	      /* The offset must always be a multiple of 4.  We use
		 the least significant bit to record whether we have
		 already processed this entry.  */
	      if ((off & 1) != 0)
		off &= ~1;
	      else
		{
		  bfd_put_32 (output_bfd, relocation, sgot->contents + off);

		  if (info->shared)
		    {
		      asection *srelgot;
		      Elf_Internal_Rela outrel;

		      /* We need to generate a R_SPARC_RELATIVE reloc
			 for the dynamic linker.  */
		      srelgot = bfd_get_section_by_name (dynobj, ".rela.got");
		      BFD_ASSERT (srelgot != NULL);

		      outrel.r_offset = (sgot->output_section->vma
					 + sgot->output_offset
					 + off);
		      outrel.r_info = ELF32_R_INFO (0, R_SPARC_RELATIVE);
		      outrel.r_addend = 0;
		      bfd_elf32_swap_reloca_out (output_bfd, &outrel,
						 (((Elf32_External_Rela *)
						   srelgot->contents)
						  + srelgot->reloc_count));
		      ++srelgot->reloc_count;
		    }

		  local_got_offsets[r_symndx] |= 1;
		}

	      relocation = sgot->output_offset + off - got_base;
	    }

	  break;

	case R_SPARC_WPLT30:
	  /* Relocation is to the entry for this symbol in the
             procedure linkage table.  */

	  /* The Solaris native assembler will generate a WPLT30 reloc
	     for a local symbol if you assemble a call from one
	     section to another when using -K pic.  We treat it as
	     WDISP30.  */
	  if (h == NULL)
	    break;

	  if (h->plt.offset == (bfd_vma) -1)
	    {
	      /* We didn't make a PLT entry for this symbol.  This
                 happens when statically linking PIC code, or when
                 using -Bsymbolic.  */
	      break;
	    }

	  if (splt == NULL)
	    {
	      splt = bfd_get_section_by_name (dynobj, ".plt");
	      BFD_ASSERT (splt != NULL);
	    }

	  relocation = (splt->output_section->vma
			+ splt->output_offset
			+ h->plt.offset);
	  break;

	case R_SPARC_PC10:
	case R_SPARC_PC22:
	  if (h != NULL
	      && strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
	    break;
	  /* Fall through.  */
	case R_SPARC_DISP8:
	case R_SPARC_DISP16:
	case R_SPARC_DISP32:
	case R_SPARC_WDISP30:
	case R_SPARC_WDISP22:
	case R_SPARC_WDISP19:
	case R_SPARC_WDISP16:
	  if (h == NULL
	      || (info->symbolic
		  && (h->elf_link_hash_flags
		      & ELF_LINK_HASH_DEF_REGULAR) != 0))
	    break;
	  /* Fall through.  */
	case R_SPARC_8:
	case R_SPARC_16:
	case R_SPARC_32:
	case R_SPARC_HI22:
	case R_SPARC_22:
	case R_SPARC_13:
	case R_SPARC_LO10:
	case R_SPARC_UA16:
	case R_SPARC_UA32:
	case R_SPARC_UA64:
	  if (info->shared)
	    {
	      Elf_Internal_Rela outrel;
	      boolean skip;

	      /* When generating a shared object, these relocations
                 are copied into the output file to be resolved at run
                 time.  */

	      if (sreloc == NULL)
		{
		  const char *name;

		  name = (bfd_elf_string_from_elf_section
			  (input_bfd,
			   elf_elfheader (input_bfd)->e_shstrndx,
			   elf_section_data (input_section)->rel_hdr.sh_name));
		  if (name == NULL)
		    return false;

		  BFD_ASSERT (strncmp (name, ".rela", 5) == 0
			      && strcmp (bfd_get_section_name (input_bfd,
							       input_section),
					 name + 5) == 0);

		  sreloc = bfd_get_section_by_name (dynobj, name);
		  BFD_ASSERT (sreloc != NULL);
		}

	      skip = false;

	      if (elf_section_data (input_section)->stab_info == NULL)
		outrel.r_offset = rel->r_offset;
	      else
		{
		  bfd_vma off;

		  off = (_bfd_stab_section_offset
			 (output_bfd, &elf_hash_table (info)->stab_info,
			  input_section,
			  &elf_section_data (input_section)->stab_info,
			  rel->r_offset));
		  if (off == (bfd_vma) -1)
		    skip = true;
		  outrel.r_offset = off;
		}

	      outrel.r_offset += (input_section->output_section->vma
				  + input_section->output_offset);

	      if (skip)
		memset (&outrel, 0, sizeof outrel);
	      /* h->dynindx may be -1 if the symbol was marked to
                 become local.  */
	      else if (h != NULL
		       && ((! info->symbolic && h->dynindx != -1)
			   || (h->elf_link_hash_flags
			       & ELF_LINK_HASH_DEF_REGULAR) == 0))
		{
		  BFD_ASSERT (h->dynindx != -1);
		  outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
		  outrel.r_addend = rel->r_addend;
		}
	      else
		{
		  if (r_type == R_SPARC_32)
		    {
		      outrel.r_info = ELF32_R_INFO (0, R_SPARC_RELATIVE);
		      outrel.r_addend = relocation + rel->r_addend;
		    }
		  else
		    {
		      long indx;

		      if (h == NULL)
			sec = local_sections[r_symndx];
		      else
			{
			  BFD_ASSERT (h->root.type == bfd_link_hash_defined
				      || (h->root.type
					  == bfd_link_hash_defweak));
			  sec = h->root.u.def.section;
			}
		      if (sec != NULL && bfd_is_abs_section (sec))
			indx = 0;
		      else if (sec == NULL || sec->owner == NULL)
			{
			  bfd_set_error (bfd_error_bad_value);
			  return false;
			}
		      else
			{
			  asection *osec;

			  osec = sec->output_section;
			  indx = elf_section_data (osec)->dynindx;

			  /* FIXME: we really should be able to link non-pic
			     shared libraries.  */
			  if (indx == 0)
			    {
			      BFD_FAIL ();
			      (*_bfd_error_handler)
				(_("%s: probably compiled without -fPIC?"),
				 bfd_get_filename (input_bfd));
			      bfd_set_error (bfd_error_bad_value);
			      return false;
			    }
			}

		      outrel.r_info = ELF32_R_INFO (indx, r_type);
		      outrel.r_addend = relocation + rel->r_addend;
		    }
		}

	      bfd_elf32_swap_reloca_out (output_bfd, &outrel,
					 (((Elf32_External_Rela *)
					   sreloc->contents)
					  + sreloc->reloc_count));
	      ++sreloc->reloc_count;

	      /* This reloc will be computed at runtime, so there's no
                 need to do anything now, unless this is a RELATIVE
                 reloc in an unallocated section.  */
	      if (skip
		  || (input_section->flags & SEC_ALLOC) != 0
		  || ELF32_R_TYPE (outrel.r_info) != R_SPARC_RELATIVE)
		continue;
	    }
	  break;

	default:
	  break;
	}

      r = bfd_reloc_continue;
      if (r_type == R_SPARC_WDISP16)
	{
	  bfd_vma x;

	  relocation += rel->r_addend;
	  relocation -= (input_section->output_section->vma
			 + input_section->output_offset);
	  relocation -= rel->r_offset;

	  x = bfd_get_32 (input_bfd, contents + rel->r_offset);
	  x |= ((((relocation >> 2) & 0xc000) << 6)
		| ((relocation >> 2) & 0x3fff));
	  bfd_put_32 (input_bfd, x, contents + rel->r_offset);

	  if ((bfd_signed_vma) relocation < - 0x40000
	      || (bfd_signed_vma) relocation > 0x3ffff)
	    r = bfd_reloc_overflow;
	  else
	    r = bfd_reloc_ok;
	}
      else if (r_type == R_SPARC_REV32)
	{
	  bfd_vma x;

	  relocation = relocation + rel->r_addend;

	  x = bfd_get_32 (input_bfd, contents + rel->r_offset);
	  x = x + relocation;
	  bfd_putl32 (/*input_bfd,*/ x, contents + rel->r_offset);
	  r = bfd_reloc_ok;
	}
      else if ((r_type == R_SPARC_WDISP30 || r_type == R_SPARC_WPLT30)
	       && SEC_DO_RELAX (input_section)
	       && rel->r_offset + 4 < input_section->_raw_size)
	{
#define G0		0
#define O7		15
#define XCC		(2 << 20)
#define COND(x)		(((x)&0xf)<<25)
#define CONDA		COND(0x8)
#define INSN_BPA	(F2(0,1) | CONDA | BPRED | XCC)
#define INSN_BA		(F2(0,2) | CONDA)
#define INSN_OR		F3(2, 0x2, 0)
#define INSN_NOP	F2(0,4)

	  bfd_vma x, y;

	  /* If the instruction is a call with either:
	     restore
	     arithmetic instruction with rd == %o7
	     where rs1 != %o7 and rs2 if it is register != %o7
	     then we can optimize if the call destination is near
	     by changing the call into a branch always.  */
	  x = bfd_get_32 (input_bfd, contents + rel->r_offset);
	  y = bfd_get_32 (input_bfd, contents + rel->r_offset + 4);
	  if ((x & OP(~0)) == OP(1) && (y & OP(~0)) == OP(2))
	    {
	      if (((y & OP3(~0)) == OP3(0x3d) /* restore */
		   || ((y & OP3(0x28)) == 0 /* arithmetic */
		       && (y & RD(~0)) == RD(O7)))
		  && (y & RS1(~0)) != RS1(O7)