// target-reloc.h -- target specific relocation support -*- C++ -*-
-// Copyright 2006, 2007 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
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
+ unsigned int shndx = lsym.get_st_shndx();
+ bool is_ordinary;
+ shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
+ if (is_ordinary
&& shndx != elfcpp::SHN_UNDEF
- && !object->is_section_included(lsym.get_st_shndx()))
+ && !object->is_section_included(shndx))
{
// RELOC is a relocation against a local symbol in a
// section we are discarding. We can ignore this
}
}
+// Behavior for relocations to discarded comdat sections.
+
+enum Comdat_behavior
+{
+ CB_UNDETERMINED, // Not yet determined -- need to look at section name.
+ CB_PRETEND, // Attempt to map to the corresponding kept section.
+ CB_IGNORE, // Ignore the relocation.
+ CB_WARNING // Print a warning.
+};
+
+// Decide what the linker should do for relocations that refer to discarded
+// comdat sections. This decision is based on the name of the section being
+// relocated.
+
+inline Comdat_behavior
+get_comdat_behavior(const char* name)
+{
+ if (Layout::is_debug_info_section(name))
+ return CB_PRETEND;
+ if (strcmp(name, ".eh_frame") == 0
+ || strcmp(name, ".gcc_except_table") == 0)
+ return CB_IGNORE;
+ return CB_WARNING;
+}
+
// This function implements the generic part of relocation processing.
// The template parameter Relocate must be a class type which provides
// a single function, relocate(), which implements the machine
Sized_relobj<size, big_endian>* object = relinfo->object;
unsigned int local_count = object->local_symbol_count();
+ Comdat_behavior comdat_behavior = CB_UNDETERMINED;
+
for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
{
Reltype reloc(prelocs);
{
sym = NULL;
psymval = object->local_symbol(r_sym);
+
+ // If the local symbol belongs to a section we are discarding,
+ // and that section is a debug section, try to find the
+ // corresponding kept section and map this symbol to its
+ // counterpart in the kept section.
+ bool is_ordinary;
+ unsigned int shndx = psymval->input_shndx(&is_ordinary);
+ if (is_ordinary
+ && shndx != elfcpp::SHN_UNDEF
+ && !object->is_section_included(shndx))
+ {
+ if (comdat_behavior == CB_UNDETERMINED)
+ {
+ const char* name =
+ object->section_name(relinfo->data_shndx).c_str();
+ comdat_behavior = get_comdat_behavior(name);
+ }
+ if (comdat_behavior == CB_PRETEND)
+ {
+ bool found;
+ typename elfcpp::Elf_types<size>::Elf_Addr value =
+ object->map_to_kept_section(shndx, &found);
+ if (found)
+ symval.set_output_value(value + psymval->input_value());
+ else
+ symval.set_output_value(0);
+ }
+ else
+ {
+ if (comdat_behavior == CB_WARNING)
+ gold_warning_at_location(relinfo, i, offset,
+ _("Relocation refers to discarded "
+ "comdat section"));
+ symval.set_output_value(0);
+ }
+ symval.set_no_output_symtab_entry();
+ psymval = &symval;
+ }
}
else
{
if (sym != NULL
&& sym->is_undefined()
&& sym->binding() != elfcpp::STB_WEAK
- && !parameters->output_is_shared())
+ && (!parameters->options().shared() // -shared
+ || parameters->options().defs())) // -z defs
gold_undefined_symbol(sym, relinfo, i, offset);
if (sym != NULL && sym->has_warning())
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
+ unsigned int shndx = lsym.get_st_shndx();
+ bool is_ordinary;
+ shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
+ if (is_ordinary
&& shndx != elfcpp::SHN_UNDEF
- && !object->is_section_included(lsym.get_st_shndx()))
+ && !object->is_section_included(shndx))
{
// RELOC is a relocation against a local symbol
// defined in a section we are discarding. Discard
off_t offset_in_output_section,
const Relocatable_relocs* rr,
unsigned char* view,
- typename elfcpp::Elf_types<size>::Elf_Addr,
+ typename elfcpp::Elf_types<size>::Elf_Addr view_address,
section_size_type,
unsigned char* reloc_view,
section_size_type reloc_view_size)
// the output section corresponding to input section
// in which this symbol is defined.
gold_assert(r_sym < local_count);
- unsigned int shndx = object->local_symbol_input_shndx(r_sym);
+ bool is_ordinary;
+ unsigned int shndx =
+ object->local_symbol_input_shndx(r_sym, &is_ordinary);
+ gold_assert(is_ordinary);
section_offset_type dummy;
Output_section* os = object->output_section(shndx, &dummy);
gold_assert(os != NULL);
gold_assert(new_offset != -1);
}
+ // In an object file, r_offset is an offset within the section.
+ // In an executable or dynamic object, generated by
+ // --emit-relocs, r_offset is an absolute address.
+ if (!parameters->options().relocatable())
+ new_offset += view_address;
+
reloc_write.put_r_offset(new_offset);
reloc_write.put_r_info(elfcpp::elf_r_info<size>(new_symndx, r_type));
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