vendor/binutils/binutils-master-20070703-075419vendor/binutils

1 files changed, 193 insertions, 0 deletions

diff --git a/gold/target-reloc.h b/gold/target-reloc.h
new file mode 100644
index 0000000000000..d282805dbebba
--- /dev/null
+++ b/gold/target-reloc.h
@@ -0,0 +1,193 @@
+// target-reloc.h -- target specific relocation support  -*- C++ -*-
+
+#ifndef GOLD_TARGET_RELOC_H
+#define GOLD_TARGET_RELOC_H
+
+#include "elfcpp.h"
+#include "object.h"
+#include "symtab.h"
+#include "reloc-types.h"
+
+namespace gold
+{
+
+// This function implements the generic part of reloc scanning.  This
+// is an inline function which takes a class whose operator()
+// implements the machine specific part of scanning.  We do it this
+// way to avoidmaking a function call for each relocation, and to
+// avoid repeating the generic code for each target.
+
+template<int size, bool big_endian, typename Target_type, int sh_type,
+	 typename Scan>
+inline void
+scan_relocs(
+    const General_options& options,
+    Symbol_table* symtab,
+    Layout* layout,
+    Target_type* target,
+    Sized_relobj<size, big_endian>* object,
+    unsigned int data_shndx,
+    const unsigned char* prelocs,
+    size_t reloc_count,
+    size_t local_count,
+    const unsigned char* plocal_syms,
+    Symbol** global_syms)
+{
+  typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
+  const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
+  const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+  Scan scan;
+
+  for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
+    {
+      Reltype reloc(prelocs);
+
+      typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
+      unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
+      unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
+
+      if (r_sym < local_count)
+	{
+	  gold_assert(plocal_syms != NULL);
+	  typename elfcpp::Sym<size, big_endian> lsym(plocal_syms
+						      + r_sym * sym_size);
+	  const unsigned int shndx = lsym.get_st_shndx();
+	  if (shndx < elfcpp::SHN_LORESERVE
+	      && shndx != elfcpp::SHN_UNDEF
+	      && !object->is_section_included(lsym.get_st_shndx()))
+	    {
+	      // RELOC is a relocation against a local symbol in a
+	      // section we are discarding.  We can ignore this
+	      // relocation.  It will eventually become a reloc
+	      // against the value zero.
+	      //
+	      // FIXME: We should issue a warning if this is an
+	      // allocated section; is this the best place to do it?
+	      // 
+	      // FIXME: The old GNU linker would in some cases look
+	      // for the linkonce section which caused this section to
+	      // be discarded, and, if the other section was the same
+	      // size, change the reloc to refer to the other section.
+	      // That seems risky and weird to me, and I don't know of
+	      // any case where it is actually required.
+
+	      continue;
+	    }
+
+	  scan.local(options, symtab, layout, target, object, data_shndx,
+		     reloc, r_type, lsym);
+	}
+      else
+	{
+	  Symbol* gsym = global_syms[r_sym - local_count];
+	  gold_assert(gsym != NULL);
+	  if (gsym->is_forwarder())
+	    gsym = symtab->resolve_forwards(gsym);
+
+	  scan.global(options, symtab, layout, target, object, data_shndx,
+		      reloc, r_type, gsym);
+	}
+    }
+}
+
+// This function implements the generic part of relocation processing.
+// This is an inline function which take a class whose operator()
+// implements the machine specific part of relocation.  We do it this
+// way to avoid making a function call for each relocation, and to
+// avoid repeating the generic relocation handling code for each
+// target.
+
+// SIZE is the ELF size: 32 or 64.  BIG_ENDIAN is the endianness of
+// the data.  SH_TYPE is the section type: SHT_REL or SHT_RELA.
+// RELOCATE implements operator() to do a relocation.
+
+// PRELOCS points to the relocation data.  RELOC_COUNT is the number
+// of relocs.  VIEW is the section data, VIEW_ADDRESS is its memory
+// address, and VIEW_SIZE is the size.
+
+template<int size, bool big_endian, typename Target_type, int sh_type,
+	 typename Relocate>
+inline void
+relocate_section(
+    const Relocate_info<size, big_endian>* relinfo,
+    Target_type* target,
+    const unsigned char* prelocs,
+    size_t reloc_count,
+    unsigned char* view,
+    typename elfcpp::Elf_types<size>::Elf_Addr view_address,
+    off_t view_size)
+{
+  typedef typename Reloc_types<sh_type, size, big_endian>::Reloc Reltype;
+  const int reloc_size = Reloc_types<sh_type, size, big_endian>::reloc_size;
+  Relocate relocate;
+
+  unsigned int local_count = relinfo->local_symbol_count;
+  const typename Sized_relobj<size, big_endian>::Local_values* local_values =
+    relinfo->local_values;
+  const Symbol* const * global_syms = relinfo->symbols;
+
+  for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
+    {
+      Reltype reloc(prelocs);
+
+      off_t offset = reloc.get_r_offset();
+
+      typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
+      unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
+      unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
+
+      const Sized_symbol<size>* sym;
+
+      Symbol_value<size> symval;
+      const Symbol_value<size> *psymval;
+      if (r_sym < local_count)
+	{
+	  sym = NULL;
+	  psymval = &(*local_values)[r_sym];
+	}
+      else
+	{
+	  const Symbol* gsym = global_syms[r_sym - local_count];
+	  gold_assert(gsym != NULL);
+	  if (gsym->is_forwarder())
+	    gsym = relinfo->symtab->resolve_forwards(gsym);
+
+	  sym = static_cast<const Sized_symbol<size>*>(gsym);
+	  if (sym->has_symtab_index())
+	    symval.set_output_symtab_index(sym->symtab_index());
+	  else
+	    symval.set_no_output_symtab_entry();
+	  symval.set_output_value(sym->value());
+	  psymval = &symval;
+	}
+
+      if (!relocate.relocate(relinfo, target, i, reloc, r_type, sym, psymval,
+			     view + offset, view_address + offset, view_size))
+	continue;
+
+      if (offset < 0 || offset >= view_size)
+	{
+	  fprintf(stderr, _("%s: %s: reloc has bad offset %zu\n"),
+		  program_name, relinfo->location(i, offset).c_str(),
+		  static_cast<size_t>(offset));
+	  gold_exit(false);
+	}
+
+      if (sym != NULL
+	  && sym->is_undefined()
+	  && sym->binding() != elfcpp::STB_WEAK)
+	{
+	  fprintf(stderr, _("%s: %s: undefined reference to '%s'\n"),
+		  program_name, relinfo->location(i, offset).c_str(),
+		  sym->name());
+	  // gold_exit(false);
+	}
+
+      if (sym != NULL && sym->has_warning())
+	relinfo->symtab->issue_warning(sym, relinfo->location(i, offset));
+    }
+}
+
+} // End namespace gold.
+
+#endif // !defined(GOLD_TARGET_RELOC_H)