// plugin.cc -- plugin manager for gold -*- C++ -*-
-// Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
// Written by Cary Coutant <ccoutant@google.com>.
// This file is part of gold.
#include <vector>
#ifdef ENABLE_PLUGINS
+#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
+#elif defined (HAVE_WINDOWS_H)
+#include <windows.h>
+#else
+#error Unknown how to handle dynamic-load-libraries.
#endif
+#if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
+
+#define RTLD_NOW 0 /* Dummy value. */
+static void *
+dlopen(const char *file, int mode ATTRIBUTE_UNUSED)
+{
+ return LoadLibrary(file);
+}
+
+static void *
+dlsym(void *handle, const char *name)
+{
+ return reinterpret_cast<void *>(
+ GetProcAddress(static_cast<HMODULE>(handle),name));
+}
+
+static const char *
+dlerror(void)
+{
+ return "unable to load dll";
+}
+
+#endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
+#endif /* ENABLE_PLUGINS */
+
#include "parameters.h"
#include "errors.h"
#include "fileread.h"
#include "target.h"
#include "readsyms.h"
#include "symtab.h"
+#include "descriptors.h"
#include "elfcpp.h"
namespace gold
static enum ld_plugin_status
get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
+static enum ld_plugin_status
+get_symbols_v2(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
+
static enum ld_plugin_status
add_input_file(const char *pathname);
static enum ld_plugin_status
allow_section_ordering();
+static enum ld_plugin_status
+allow_unique_segment_for_sections();
+
+static enum ld_plugin_status
+unique_segment_for_sections(const char* segment_name,
+ uint64_t flags,
+ uint64_t align,
+ const struct ld_plugin_section *section_list,
+ unsigned int num_sections);
};
#endif // ENABLE_PLUGINS
sscanf(ver, "%d.%d", &major, &minor);
// Allocate and populate a transfer vector.
- const int tv_fixed_size = 23;
+ const int tv_fixed_size = 26;
int tv_size = this->args_.size() + tv_fixed_size;
ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
tv[i].tv_u.tv_val = LDPO_REL;
else if (parameters->options().shared())
tv[i].tv_u.tv_val = LDPO_DYN;
+ else if (parameters->options().pie())
+ tv[i].tv_u.tv_val = LDPO_PIE;
else
tv[i].tv_u.tv_val = LDPO_EXEC;
tv[i].tv_tag = LDPT_GET_SYMBOLS;
tv[i].tv_u.tv_get_symbols = get_symbols;
+ ++i;
+ tv[i].tv_tag = LDPT_GET_SYMBOLS_V2;
+ tv[i].tv_u.tv_get_symbols = get_symbols_v2;
+
++i;
tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
tv[i].tv_u.tv_add_input_file = add_input_file;
tv[i].tv_tag = LDPT_ALLOW_SECTION_ORDERING;
tv[i].tv_u.tv_allow_section_ordering = allow_section_ordering;
+ ++i;
+ tv[i].tv_tag = LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS;
+ tv[i].tv_u.tv_allow_unique_segment_for_sections
+ = allow_unique_segment_for_sections;
+
+ ++i;
+ tv[i].tv_tag = LDPT_UNIQUE_SEGMENT_FOR_SECTIONS;
+ tv[i].tv_u.tv_unique_segment_for_sections = unique_segment_for_sections;
+
++i;
tv[i].tv_tag = LDPT_NULL;
tv[i].tv_u.tv_val = 0;
void
Plugin_manager::cleanup()
{
+ if (this->any_added_)
+ {
+ // If any input files were added, close all the input files.
+ // This is because the plugin may want to remove them, and on
+ // Windows you are not allowed to remove an open file.
+ close_all_descriptors();
+ }
+
for (this->current_ = this->plugins_.begin();
this->current_ != this->plugins_.end();
++this->current_)
{
}
-// Return TRUE if a defined symbol might be reachable from outside the
-// universe of claimed objects.
+// Return TRUE if a defined symbol is referenced from outside the
+// universe of claimed objects. Only references from relocatable,
+// non-IR (unclaimed) objects count as a reference. References from
+// dynamic objects count only as "visible".
static inline bool
-is_visible_from_outside(Symbol* lsym)
+is_referenced_from_outside(Symbol* lsym)
{
if (lsym->in_real_elf())
return true;
return true;
if (parameters->options().is_undefined(lsym->name()))
return true;
+ return false;
+}
+
+// Return TRUE if a defined symbol might be reachable from outside the
+// load module.
+
+static inline bool
+is_visible_from_outside(Symbol* lsym)
+{
+ if (lsym->in_dyn())
+ return true;
if (parameters->options().export_dynamic() || parameters->options().shared())
return lsym->is_externally_visible();
return false;
// Get symbol resolution info.
ld_plugin_status
-Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
-{
+Pluginobj::get_symbol_resolution_info(int nsyms,
+ ld_plugin_symbol* syms,
+ int version) const
+{
+ // For version 1 of this interface, we cannot use
+ // LDPR_PREVAILING_DEF_IRONLY_EXP, so we return LDPR_PREVAILING_DEF
+ // instead.
+ const ld_plugin_symbol_resolution ldpr_prevailing_def_ironly_exp
+ = (version > 1
+ ? LDPR_PREVAILING_DEF_IRONLY_EXP
+ : LDPR_PREVAILING_DEF);
+
if (nsyms > this->nsyms_)
return LDPS_NO_SYMS;
if (lsym->source() != Symbol::FROM_OBJECT)
res = LDPR_RESOLVED_EXEC;
else if (lsym->object()->pluginobj() == this)
- res = (is_visible_from_outside(lsym)
- ? LDPR_PREVAILING_DEF
- : LDPR_PREVAILING_DEF_IRONLY);
+ {
+ if (is_referenced_from_outside(lsym))
+ res = LDPR_PREVAILING_DEF;
+ else if (is_visible_from_outside(lsym))
+ res = ldpr_prevailing_def_ironly_exp;
+ else
+ res = LDPR_PREVAILING_DEF_IRONLY;
+ }
else if (lsym->object()->pluginobj() != NULL)
res = LDPR_RESOLVED_IR;
else if (lsym->object()->is_dynamic())
if (lsym->source() != Symbol::FROM_OBJECT)
res = LDPR_PREEMPTED_REG;
else if (lsym->object() == static_cast<const Object*>(this))
- res = (is_visible_from_outside(lsym)
- ? LDPR_PREVAILING_DEF
- : LDPR_PREVAILING_DEF_IRONLY);
+ {
+ if (is_referenced_from_outside(lsym))
+ res = LDPR_PREVAILING_DEF;
+ else if (is_visible_from_outside(lsym))
+ res = ldpr_prevailing_def_ironly_exp;
+ else
+ res = LDPR_PREVAILING_DEF_IRONLY;
+ }
else
res = (lsym->object()->pluginobj() != NULL
? LDPR_PREEMPTED_IR
// Return a view of the contents of a section. Not used for plugin objects.
template<int size, bool big_endian>
-Object::Location
-Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
+const unsigned char*
+Sized_pluginobj<size, big_endian>::do_section_contents(
+ unsigned int,
+ section_size_type*,
+ bool)
{
- Location loc(0, 0);
-
gold_unreachable();
- return loc;
+ return NULL;
}
// Return section flags. Not used for plugin objects.
return NULL;
}
-// Get symbol counts. Not used for plugin objects.
+// Get symbol counts. Don't count plugin objects; the replacement
+// files will provide the counts.
template<int size, bool big_endian>
void
-Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
- size_t*, size_t*) const
+Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(
+ const Symbol_table*,
+ size_t* defined,
+ size_t* used) const
{
- gold_unreachable();
+ *defined = 0;
+ *used = 0;
}
// Get symbols. Not used for plugin objects.
Pluginobj* plugin_obj = obj->pluginobj();
if (plugin_obj == NULL)
return LDPS_ERR;
- return plugin_obj->get_symbol_resolution_info(nsyms, syms);
+ return plugin_obj->get_symbol_resolution_info(nsyms, syms, 1);
+}
+
+// Version 2 of the above. The only difference is that this version
+// is allowed to return the resolution code LDPR_PREVAILING_DEF_IRONLY_EXP.
+
+static enum ld_plugin_status
+get_symbols_v2(const void* handle, int nsyms, ld_plugin_symbol* syms)
+{
+ gold_assert(parameters->options().has_plugins());
+ Object* obj = parameters->options().plugins()->object(
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
+ if (obj == NULL)
+ return LDPS_ERR;
+ Pluginobj* plugin_obj = obj->pluginobj();
+ if (plugin_obj == NULL)
+ return LDPS_ERR;
+ return plugin_obj->get_symbol_resolution_info(nsyms, syms, 2);
}
// Add a new (real) input file generated by a plugin.
// which they should appear in the final layout.
static enum ld_plugin_status
-update_section_order(const struct ld_plugin_section *section_list,
+update_section_order(const struct ld_plugin_section* section_list,
unsigned int num_sections)
{
gold_assert(parameters->options().has_plugins());
if (section_list == NULL)
return LDPS_ERR;
- std::map<Section_id, unsigned int> order_map;
+ Layout* layout = parameters->options().plugins()->layout();
+ gold_assert (layout != NULL);
+
+ std::map<Section_id, unsigned int>* order_map
+ = layout->get_section_order_map();
+ /* Store the mapping from Section_id to section position in layout's
+ order_map to consult after output sections are added. */
for (unsigned int i = 0; i < num_sections; ++i)
{
Object* obj = parameters->options().plugins()->get_elf_object(
return LDPS_BAD_HANDLE;
unsigned int shndx = section_list[i].shndx;
Section_id secn_id(obj, shndx);
- order_map[secn_id] = i + 1;
+ (*order_map)[secn_id] = i + 1;
}
- Layout* layout = parameters->options().plugins()->layout();
- gold_assert (layout != NULL);
-
- for (Layout::Section_list::const_iterator p = layout->section_list().begin();
- p != layout->section_list().end();
- ++p)
- (*p)->update_section_layout(order_map);
-
return LDPS_OK;
}
return LDPS_OK;
}
+// Let the linker know that a subset of sections could be mapped
+// to a unique segment.
+
+static enum ld_plugin_status
+allow_unique_segment_for_sections()
+{
+ gold_assert(parameters->options().has_plugins());
+ Layout* layout = parameters->options().plugins()->layout();
+ layout->set_unique_segment_for_sections_specified();
+ return LDPS_OK;
+}
+
+// This function should map the list of sections specified in the
+// SECTION_LIST to a unique segment. ELF segments do not have names
+// and the NAME is used to identify Output Section which should contain
+// the list of sections. This Output Section will then be mapped to
+// a unique segment. FLAGS is used to specify if any additional segment
+// flags need to be set. For instance, a specific segment flag can be
+// set to identify this segment. Unsetting segment flags is not possible.
+// ALIGN specifies the alignment of the segment.
+
+static enum ld_plugin_status
+unique_segment_for_sections(const char* segment_name,
+ uint64_t flags,
+ uint64_t align,
+ const struct ld_plugin_section* section_list,
+ unsigned int num_sections)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (num_sections == 0)
+ return LDPS_OK;
+
+ if (section_list == NULL)
+ return LDPS_ERR;
+
+ Layout* layout = parameters->options().plugins()->layout();
+ gold_assert (layout != NULL);
+
+ Layout::Unique_segment_info* s = new Layout::Unique_segment_info;
+ s->name = segment_name;
+ s->flags = flags;
+ s->align = align;
+
+ for (unsigned int i = 0; i < num_sections; ++i)
+ {
+ Object* obj = parameters->options().plugins()->get_elf_object(
+ section_list[i].handle);
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+ unsigned int shndx = section_list[i].shndx;
+ Const_section_id secn_id(obj, shndx);
+ layout->insert_section_segment_map(secn_id, s);
+ }
+
+ return LDPS_OK;
+}
+
#endif // ENABLE_PLUGINS
// Allocate a Pluginobj object of the appropriate size and endianness.
projects / deliverable / binutils-gdb.git / blobdiff