#include "gold.h"
+#include <algorithm>
#include "elfcpp.h"
#include "parameters.h"
#include "reloc.h"
template<int size, bool big_endian>
class Output_data_plt_powerpc;
+template<int size, bool big_endian>
+class Output_data_brlt_powerpc;
+
template<int size, bool big_endian>
class Output_data_got_powerpc;
template<int size, bool big_endian>
class Output_data_glink;
+template<int size, bool big_endian>
+class Stub_table;
+
template<int size, bool big_endian>
class Powerpc_relobj : public Sized_relobj_file<size, big_endian>
{
public:
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- typedef typename elfcpp::Elf_types<size>::Elf_Off Offset;
+ typedef Unordered_set<Section_id, Section_id_hash> Section_refs;
+ typedef Unordered_map<Address, Section_refs> Access_from;
Powerpc_relobj(const std::string& name, Input_file* input_file, off_t offset,
const typename elfcpp::Ehdr<size, big_endian>& ehdr)
: Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
- special_(0), opd_ent_shndx_(), opd_ent_off_()
+ special_(0), has_small_toc_reloc_(false), opd_valid_(false),
+ opd_ent_(), access_from_map_(), has14_(), stub_table_()
{ }
~Powerpc_relobj()
init_opd(size_t opd_size)
{
size_t count = this->opd_ent_ndx(opd_size);
- this->opd_ent_shndx_.resize(count);
- this->opd_ent_off_.reserve(count);
+ this->opd_ent_.resize(count);
}
// Return section and offset of function entry for .opd + R_OFF.
- void
- get_opd_ent(Address r_off, unsigned int* shndx, Address* value)
+ unsigned int
+ get_opd_ent(Address r_off, Address* value = NULL) const
{
size_t ndx = this->opd_ent_ndx(r_off);
- gold_assert(ndx < this->opd_ent_shndx_.size());
- gold_assert(this->opd_ent_shndx_[ndx] != 0);
- *shndx = this->opd_ent_shndx_[ndx];
- *value = this->opd_ent_off_[ndx];
+ gold_assert(ndx < this->opd_ent_.size());
+ gold_assert(this->opd_ent_[ndx].shndx != 0);
+ if (value != NULL)
+ *value = this->opd_ent_[ndx].off;
+ return this->opd_ent_[ndx].shndx;
}
// Set section and offset of function entry for .opd + R_OFF.
set_opd_ent(Address r_off, unsigned int shndx, Address value)
{
size_t ndx = this->opd_ent_ndx(r_off);
- gold_assert(ndx < this->opd_ent_shndx_.size());
- this->opd_ent_shndx_[ndx] = shndx;
- this->opd_ent_off_[ndx] = value;
+ gold_assert(ndx < this->opd_ent_.size());
+ this->opd_ent_[ndx].shndx = shndx;
+ this->opd_ent_[ndx].off = value;
+ }
+
+ // Return discard flag for .opd + R_OFF.
+ bool
+ get_opd_discard(Address r_off) const
+ {
+ size_t ndx = this->opd_ent_ndx(r_off);
+ gold_assert(ndx < this->opd_ent_.size());
+ return this->opd_ent_[ndx].discard;
+ }
+
+ // Set discard flag for .opd + R_OFF.
+ void
+ set_opd_discard(Address r_off)
+ {
+ size_t ndx = this->opd_ent_ndx(r_off);
+ gold_assert(ndx < this->opd_ent_.size());
+ this->opd_ent_[ndx].discard = true;
}
+ Access_from*
+ access_from_map()
+ { return &this->access_from_map_; }
+
+ // Add a reference from SRC_OBJ, SRC_INDX to this object's .opd
+ // section at DST_OFF.
+ void
+ add_reference(Object* src_obj,
+ unsigned int src_indx,
+ typename elfcpp::Elf_types<size>::Elf_Addr dst_off)
+ {
+ Section_id src_id(src_obj, src_indx);
+ this->access_from_map_[dst_off].insert(src_id);
+ }
+
+ // Add a reference to the code section specified by the .opd entry
+ // at DST_OFF
+ void
+ add_gc_mark(typename elfcpp::Elf_types<size>::Elf_Addr dst_off)
+ {
+ size_t ndx = this->opd_ent_ndx(dst_off);
+ if (ndx >= this->opd_ent_.size())
+ this->opd_ent_.resize(ndx + 1);
+ this->opd_ent_[ndx].gc_mark = true;
+ }
+
+ void
+ process_gc_mark(Symbol_table* symtab)
+ {
+ for (size_t i = 0; i < this->opd_ent_.size(); i++)
+ if (this->opd_ent_[i].gc_mark)
+ {
+ unsigned int shndx = this->opd_ent_[i].shndx;
+ symtab->gc()->worklist().push(Section_id(this, shndx));
+ }
+ }
+
+ bool
+ opd_valid() const
+ { return this->opd_valid_; }
+
+ void
+ set_opd_valid()
+ { this->opd_valid_ = true; }
+
// Examine .rela.opd to build info about function entry points.
void
scan_opd_relocs(size_t reloc_count,
const unsigned char* prelocs,
const unsigned char* plocal_syms);
+ // Perform the Sized_relobj_file method, then set up opd info from
+ // .opd relocs.
void
do_read_relocs(Read_relocs_data*);
bool
do_find_special_sections(Read_symbols_data* sd);
+ // Adjust this local symbol value. Return false if the symbol
+ // should be discarded from the output file.
+ bool
+ do_adjust_local_symbol(Symbol_value<size>* lv) const
+ {
+ if (size == 64 && this->opd_shndx() != 0)
+ {
+ bool is_ordinary;
+ if (lv->input_shndx(&is_ordinary) != this->opd_shndx())
+ return true;
+ if (this->get_opd_discard(lv->input_value()))
+ return false;
+ }
+ return true;
+ }
+
// Return offset in output GOT section that this object will use
// as a TOC pointer. Won't be just a constant with multi-toc support.
Address
toc_base_offset() const
{ return 0x8000; }
+ void
+ set_has_small_toc_reloc()
+ { has_small_toc_reloc_ = true; }
+
+ bool
+ has_small_toc_reloc() const
+ { return has_small_toc_reloc_; }
+
+ void
+ set_has_14bit_branch(unsigned int shndx)
+ {
+ if (shndx >= this->has14_.size())
+ this->has14_.resize(shndx + 1);
+ this->has14_[shndx] = true;
+ }
+
+ bool
+ has_14bit_branch(unsigned int shndx) const
+ { return shndx < this->has14_.size() && this->has14_[shndx]; }
+
+ void
+ set_stub_table(unsigned int shndx, Stub_table<size, big_endian>* stub_table)
+ {
+ if (shndx >= this->stub_table_.size())
+ this->stub_table_.resize(shndx + 1);
+ this->stub_table_[shndx] = stub_table;
+ }
+
+ Stub_table<size, big_endian>*
+ stub_table(unsigned int shndx)
+ {
+ if (shndx < this->stub_table_.size())
+ return this->stub_table_[shndx];
+ return NULL;
+ }
+
private:
- // Return index into opd_ent_shndx or opd_ent_off array for .opd entry
- // at OFF. .opd entries are 24 bytes long, but they can be spaced
- // 16 bytes apart when the language doesn't use the last 8-byte
- // word, the environment pointer. Thus dividing the entry section
- // offset by 16 will give an index into opd_ent_shndx_ and
- // opd_ent_off_ that works for either layout of .opd. (It leaves
- // some elements of the vectors unused when .opd entries are spaced
- // 24 bytes apart, but we don't know the spacing until relocations
- // are processed, and in any case it is possible for an object to
- // have some entries spaced 16 bytes apart and others 24 bytes apart.)
+ struct Opd_ent
+ {
+ unsigned int shndx;
+ bool discard : 1;
+ bool gc_mark : 1;
+ Address off;
+ };
+
+ // Return index into opd_ent_ array for .opd entry at OFF.
+ // .opd entries are 24 bytes long, but they can be spaced 16 bytes
+ // apart when the language doesn't use the last 8-byte word, the
+ // environment pointer. Thus dividing the entry section offset by
+ // 16 will give an index into opd_ent_ that works for either layout
+ // of .opd. (It leaves some elements of the vector unused when .opd
+ // entries are spaced 24 bytes apart, but we don't know the spacing
+ // until relocations are processed, and in any case it is possible
+ // for an object to have some entries spaced 16 bytes apart and
+ // others 24 bytes apart.)
size_t
opd_ent_ndx(size_t off) const
{ return off >> 4;}
// For 32-bit the .got2 section shdnx, for 64-bit the .opd section shndx.
unsigned int special_;
+
+ // For 64-bit, whether this object uses small model relocs to access
+ // the toc.
+ bool has_small_toc_reloc_;
+
+ // Set at the start of gc_process_relocs, when we know opd_ent_
+ // vector is valid. The flag could be made atomic and set in
+ // do_read_relocs with memory_order_release and then tested with
+ // memory_order_acquire, potentially resulting in fewer entries in
+ // access_from_map_.
+ bool opd_valid_;
+
// The first 8-byte word of an OPD entry gives the address of the
// entry point of the function. Relocatable object files have a
- // relocation on this word. The following two vectors record the
+ // relocation on this word. The following vector records the
// section and offset specified by these relocations.
- std::vector<unsigned int> opd_ent_shndx_;
- std::vector<Offset> opd_ent_off_;
+ std::vector<Opd_ent> opd_ent_;
+
+ // References made to this object's .opd section when running
+ // gc_process_relocs for another object, before the opd_ent_ vector
+ // is valid for this object.
+ Access_from access_from_map_;
+
+ // Whether input section has a 14-bit branch reloc.
+ std::vector<bool> has14_;
+
+ // The stub table to use for a given input section.
+ std::vector<Stub_table<size, big_endian>*> stub_table_;
};
template<int size, bool big_endian>
Target_powerpc()
: Sized_target<size, big_endian>(&powerpc_info),
- got_(NULL), plt_(NULL), glink_(NULL), rela_dyn_(NULL),
- copy_relocs_(elfcpp::R_POWERPC_COPY),
- dynbss_(NULL), tlsld_got_offset_(-1U)
+ got_(NULL), plt_(NULL), iplt_(NULL), brlt_section_(NULL),
+ glink_(NULL), rela_dyn_(NULL), copy_relocs_(elfcpp::R_POWERPC_COPY),
+ dynbss_(NULL), tlsld_got_offset_(-1U),
+ stub_tables_(), branch_lookup_table_(), branch_info_(),
+ plt_thread_safe_(false)
{
}
return NULL;
}
+ // Provide linker defined save/restore functions.
+ void
+ define_save_restore_funcs(Layout*, Symbol_table*);
+
+ // No stubs unless a final link.
+ bool
+ do_may_relax() const
+ { return !parameters->options().relocatable(); }
+
+ bool
+ do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*);
+
+ // Stash info about branches, for stub generation.
+ void
+ push_branch(Powerpc_relobj<size, big_endian>* ppc_object,
+ unsigned int data_shndx, Address r_offset,
+ unsigned int r_type, unsigned int r_sym, Address addend)
+ {
+ Branch_info info(ppc_object, data_shndx, r_offset, r_type, r_sym, addend);
+ this->branch_info_.push_back(info);
+ if (r_type == elfcpp::R_POWERPC_REL14
+ || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN
+ || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN)
+ ppc_object->set_has_14bit_branch(data_shndx);
+ }
+
+ Stub_table<size, big_endian>*
+ new_stub_table();
+
+ void
+ do_define_standard_symbols(Symbol_table*, Layout*);
+
// Finalize the sections.
void
do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
uint64_t
do_dynsym_value(const Symbol*) const;
+ // Return the PLT address to use for a local symbol.
+ uint64_t
+ do_plt_address_for_local(const Relobj*, unsigned int) const;
+
+ // Return the PLT address to use for a global symbol.
+ uint64_t
+ do_plt_address_for_global(const Symbol*) const;
+
+ // Return the offset to use for the GOT_INDX'th got entry which is
+ // for a local tls symbol specified by OBJECT, SYMNDX.
+ int64_t
+ do_tls_offset_for_local(const Relobj* object,
+ unsigned int symndx,
+ unsigned int got_indx) const;
+
+ // Return the offset to use for the GOT_INDX'th got entry which is
+ // for global tls symbol GSYM.
+ int64_t
+ do_tls_offset_for_global(Symbol* gsym, unsigned int got_indx) const;
+
// Relocate a section.
void
relocate_section(const Relocate_info<size, big_endian>*,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
- off_t offset_in_output_section,
+ typename elfcpp::Elf_types<size>::Elf_Off
+ offset_in_output_section,
const Relocatable_relocs*,
unsigned char*,
Address view_address,
return this->plt_;
}
+ // Get the IPLT section.
+ const Output_data_plt_powerpc<size, big_endian>*
+ iplt_section() const
+ {
+ gold_assert(this->iplt_ != NULL);
+ return this->iplt_;
+ }
+
// Get the .glink section.
const Output_data_glink<size, big_endian>*
glink_section() const
return this->got_;
}
+ // Get the GOT section, creating it if necessary.
+ Output_data_got_powerpc<size, big_endian>*
+ got_section(Symbol_table*, Layout*);
+
Object*
do_make_elf_object(const std::string&, Input_file*, off_t,
const elfcpp::Ehdr<size, big_endian>&);
unsigned int
plt_entry_size() const;
+ // Add any special sections for this symbol to the gc work list.
+ // For powerpc64, this adds the code section of a function
+ // descriptor.
+ void
+ do_gc_mark_symbol(Symbol_table* symtab, Symbol* sym) const;
+
+ // Handle target specific gc actions when adding a gc reference from
+ // SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX
+ // and DST_OFF. For powerpc64, this adds a referenc to the code
+ // section of a function descriptor.
+ void
+ do_gc_add_reference(Symbol_table* symtab,
+ Object* src_obj,
+ unsigned int src_shndx,
+ Object* dst_obj,
+ unsigned int dst_shndx,
+ Address dst_off) const;
+
+ typedef std::vector<Stub_table<size, big_endian>*> Stub_tables;
+ const Stub_tables&
+ stub_tables() const
+ { return this->stub_tables_; }
+
+ const Output_data_brlt_powerpc<size, big_endian>*
+ brlt_section() const
+ { return this->brlt_section_; }
+
+ void
+ add_branch_lookup_table(Address to)
+ {
+ unsigned int off = this->branch_lookup_table_.size() * (size / 8);
+ this->branch_lookup_table_.insert(std::make_pair(to, off));
+ }
+
+ Address
+ find_branch_lookup_table(Address to)
+ {
+ typename Branch_lookup_table::const_iterator p
+ = this->branch_lookup_table_.find(to);
+ return p == this->branch_lookup_table_.end() ? invalid_address : p->second;
+ }
+
+ void
+ write_branch_lookup_table(unsigned char *oview)
+ {
+ for (typename Branch_lookup_table::const_iterator p
+ = this->branch_lookup_table_.begin();
+ p != this->branch_lookup_table_.end();
+ ++p)
+ {
+ elfcpp::Swap<32, big_endian>::writeval(oview + p->second, p->first);
+ }
+ }
+
+ bool
+ plt_thread_safe() const
+ { return this->plt_thread_safe_; }
+
private:
// The class which scans relocations.
class Scan
{
public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+
Scan()
: issued_non_pic_error_(false)
{ }
unsigned int data_shndx,
Output_section* output_section,
const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
- const elfcpp::Sym<size, big_endian>& lsym);
+ const elfcpp::Sym<size, big_endian>& lsym,
+ bool is_discarded);
inline void
global(Symbol_table* symtab, Layout* layout, Target_powerpc* target,
void
check_non_pic(Relobj*, unsigned int r_type);
+ bool
+ reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>* object,
+ unsigned int r_type);
+
// Whether we have issued an error about a non-PIC compilation.
bool issued_non_pic_error_;
};
+ Address
+ symval_for_branch(Address value, const Sized_symbol<size>* gsym,
+ Powerpc_relobj<size, big_endian>* object,
+ unsigned int *dest_shndx);
+
// The class which implements relocation.
class Relocate
{
enum skip_tls call_tls_get_addr_;
};
+ class Relocate_comdat_behavior
+ {
+ public:
+ // Decide what the linker should do for relocations that refer to
+ // discarded comdat sections.
+ inline Comdat_behavior
+ get(const char* name)
+ {
+ gold::Default_comdat_behavior default_behavior;
+ Comdat_behavior ret = default_behavior.get(name);
+ if (ret == CB_WARNING)
+ {
+ if (size == 32
+ && (strcmp(name, ".fixup") == 0
+ || strcmp(name, ".got2") == 0))
+ ret = CB_IGNORE;
+ if (size == 64
+ && (strcmp(name, ".opd") == 0
+ || strcmp(name, ".toc") == 0
+ || strcmp(name, ".toc1") == 0))
+ ret = CB_IGNORE;
+ }
+ return ret;
+ }
+ };
+
// A class which returns the size required for a relocation type,
// used while scanning relocs during a relocatable link.
class Relocatable_size_for_reloc
return tls::TLSOPT_TO_LE;
}
- // Get the GOT section, creating it if necessary.
- Output_data_got_powerpc<size, big_endian>*
- got_section(Symbol_table*, Layout*);
-
// Create glink.
void
make_glink_section(Layout*);
// Create the PLT section.
void
- make_plt_section(Layout*);
+ make_plt_section(Symbol_table*, Layout*);
+
+ void
+ make_iplt_section(Symbol_table*, Layout*);
+
+ void
+ make_brlt_section(Layout*);
// Create a PLT entry for a global symbol.
void
- make_plt_entry(Layout*, Symbol*,
- const elfcpp::Rela<size, big_endian>&,
- const Sized_relobj<size, big_endian>* object);
+ make_plt_entry(Symbol_table*, Layout*, Symbol*);
+
+ // Create a PLT entry for a local IFUNC symbol.
+ void
+ make_local_ifunc_plt_entry(Symbol_table*, Layout*,
+ Sized_relobj_file<size, big_endian>*,
+ unsigned int);
+
// Create a GOT entry for local dynamic __tls_get_addr.
unsigned int
reloc, this->rela_dyn_section(layout));
}
+ // Look over all the input sections, deciding where to place stub.
+ void
+ group_sections(Layout*, const Task*);
+
+ // Sort output sections by address.
+ struct Sort_sections
+ {
+ bool
+ operator()(const Output_section* sec1, const Output_section* sec2)
+ { return sec1->address() < sec2->address(); }
+ };
+
+ class Branch_info
+ {
+ public:
+ Branch_info(Powerpc_relobj<size, big_endian>* ppc_object,
+ unsigned int data_shndx,
+ Address r_offset,
+ unsigned int r_type,
+ unsigned int r_sym,
+ Address addend)
+ : object_(ppc_object), shndx_(data_shndx), offset_(r_offset),
+ r_type_(r_type), r_sym_(r_sym), addend_(addend)
+ { }
+
+ ~Branch_info()
+ { }
+
+ // If this branch needs a plt call stub, or a long branch stub, make one.
+ void
+ make_stub(Stub_table<size, big_endian>*,
+ Stub_table<size, big_endian>*,
+ Symbol_table*) const;
+
+ private:
+ // The branch location..
+ Powerpc_relobj<size, big_endian>* object_;
+ unsigned int shndx_;
+ Address offset_;
+ // ..and the branch type and destination.
+ unsigned int r_type_;
+ unsigned int r_sym_;
+ Address addend_;
+ };
+
// Information about this specific target which we pass to the
// general Target structure.
static Target::Target_info powerpc_info;
GOT_TYPE_TPREL // entry for @got@tprel
};
- // The GOT output section.
+ // The GOT section.
Output_data_got_powerpc<size, big_endian>* got_;
- // The PLT output section.
+ // The PLT section.
Output_data_plt_powerpc<size, big_endian>* plt_;
- // The .glink output section.
+ // The IPLT section.
+ Output_data_plt_powerpc<size, big_endian>* iplt_;
+ // Section holding long branch destinations.
+ Output_data_brlt_powerpc<size, big_endian>* brlt_section_;
+ // The .glink section.
Output_data_glink<size, big_endian>* glink_;
- // The dynamic reloc output section.
+ // The dynamic reloc section.
Reloc_section* rela_dyn_;
// Relocs saved to avoid a COPY reloc.
Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
Output_data_space* dynbss_;
// Offset of the GOT entry for local dynamic __tls_get_addr calls.
unsigned int tlsld_got_offset_;
+
+ Stub_tables stub_tables_;
+ typedef Unordered_map<Address, unsigned int> Branch_lookup_table;
+ Branch_lookup_table branch_lookup_table_;
+
+ typedef std::vector<Branch_info> Branches;
+ Branches branch_info_;
+
+ bool plt_thread_safe_;
};
template<>
if (gsym->is_from_dynobj())
return true;
- // If we are generating a shared object, and gsym symbol is
+ // If we are generating a shared object, and this symbol is
// undefined or preemptible, we need to use the PLT entry.
if (parameters->options().shared()
&& (gsym->is_undefined() || gsym->is_preemptible()))
return true;
- // If gsym is a call to a weak undefined symbol, we need to use
+ // If this is a call to a weak undefined symbol, we need to use
// the PLT entry; the symbol may be defined by a library loaded
// at runtime.
if ((flags & Symbol::FUNCTION_CALL) && gsym->is_weak_undefined())
class Powerpc_relocate_functions
{
public:
- enum overflow_check
+ enum Overflow_check
{
- check_none,
- check_signed,
- check_bitfield
+ CHECK_NONE,
+ CHECK_SIGNED,
+ CHECK_BITFIELD
};
- enum overflow_status
+ enum Status
{
- status_ok,
- status_overflow
+ STATUS_OK,
+ STATUS_OVERFLOW
};
private:
}
template<int valsize>
- static inline enum overflow_status
- overflowed(Address value, enum overflow_check overflow)
+ static inline Status
+ overflowed(Address value, Overflow_check overflow)
{
- if (overflow == check_signed)
+ if (overflow == CHECK_SIGNED)
{
if (has_overflow_signed<valsize>(value))
- return status_overflow;
+ return STATUS_OVERFLOW;
}
- else if (overflow == check_bitfield)
+ else if (overflow == CHECK_BITFIELD)
{
if (has_overflow_bitfield<valsize>(value))
- return status_overflow;
+ return STATUS_OVERFLOW;
}
- return status_ok;
+ return STATUS_OK;
}
// Do a simple RELA relocation
template<int valsize>
- static inline enum overflow_status
- rela(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ rela(unsigned char* view, Address value, Overflow_check overflow)
{
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
}
template<int valsize>
- static inline enum overflow_status
+ static inline Status
rela(unsigned char* view,
unsigned int right_shift,
typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
Address value,
- enum overflow_check overflow)
+ Overflow_check overflow)
{
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
// Do a simple RELA relocation, unaligned.
template<int valsize>
- static inline enum overflow_status
- rela_ua(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ rela_ua(unsigned char* view, Address value, Overflow_check overflow)
{
elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, value);
return overflowed<valsize>(value, overflow);
}
template<int valsize>
- static inline enum overflow_status
+ static inline Status
rela_ua(unsigned char* view,
unsigned int right_shift,
typename elfcpp::Valtype_base<valsize>::Valtype dst_mask,
Address value,
- enum overflow_check overflow)
+ Overflow_check overflow)
{
typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
Valtype;
// R_PPC64_ADDR64: (Symbol + Addend)
static inline void
addr64(unsigned char* view, Address value)
- { This::template rela<64>(view, value, check_none); }
+ { This::template rela<64>(view, value, CHECK_NONE); }
// R_PPC64_UADDR64: (Symbol + Addend) unaligned
static inline void
addr64_u(unsigned char* view, Address value)
- { This::template rela_ua<64>(view, value, check_none); }
+ { This::template rela_ua<64>(view, value, CHECK_NONE); }
// R_POWERPC_ADDR32: (Symbol + Addend)
- static inline enum overflow_status
- addr32(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ addr32(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela<32>(view, value, overflow); }
// R_POWERPC_UADDR32: (Symbol + Addend) unaligned
- static inline enum overflow_status
- addr32_u(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ addr32_u(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela_ua<32>(view, value, overflow); }
// R_POWERPC_ADDR24: (Symbol + Addend) & 0x3fffffc
- static inline enum overflow_status
- addr24(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ addr24(unsigned char* view, Address value, Overflow_check overflow)
{
- enum overflow_status stat
- = This::template rela<32>(view, 0, 0x03fffffc, value, overflow);
- if (overflow != check_none && (value & 3) != 0)
- stat = status_overflow;
+ Status stat = This::template rela<32>(view, 0, 0x03fffffc, value, overflow);
+ if (overflow != CHECK_NONE && (value & 3) != 0)
+ stat = STATUS_OVERFLOW;
return stat;
}
// R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff
- static inline enum overflow_status
- addr16(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ addr16(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela<16>(view, value, overflow); }
// R_POWERPC_ADDR16: (Symbol + Addend) & 0xffff, unaligned
- static inline enum overflow_status
- addr16_u(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ addr16_u(unsigned char* view, Address value, Overflow_check overflow)
{ return This::template rela_ua<16>(view, value, overflow); }
// R_POWERPC_ADDR16_DS: (Symbol + Addend) & 0xfffc
- static inline enum overflow_status
- addr16_ds(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ addr16_ds(unsigned char* view, Address value, Overflow_check overflow)
{
- enum overflow_status stat
- = This::template rela<16>(view, 0, 0xfffc, value, overflow);
- if (overflow != check_none && (value & 3) != 0)
- stat = status_overflow;
+ Status stat = This::template rela<16>(view, 0, 0xfffc, value, overflow);
+ if (overflow != CHECK_NONE && (value & 3) != 0)
+ stat = STATUS_OVERFLOW;
return stat;
}
// R_POWERPC_ADDR16_HI: ((Symbol + Addend) >> 16) & 0xffff
static inline void
addr16_hi(unsigned char* view, Address value)
- { This::template rela<16>(view, 16, 0xffff, value, check_none); }
+ { This::template rela<16>(view, 16, 0xffff, value, CHECK_NONE); }
// R_POWERPC_ADDR16_HA: ((Symbol + Addend + 0x8000) >> 16) & 0xffff
static inline void
// R_POWERPC_ADDR16_HIGHER: ((Symbol + Addend) >> 32) & 0xffff
static inline void
addr16_hi2(unsigned char* view, Address value)
- { This::template rela<16>(view, 32, 0xffff, value, check_none); }
+ { This::template rela<16>(view, 32, 0xffff, value, CHECK_NONE); }
// R_POWERPC_ADDR16_HIGHERA: ((Symbol + Addend + 0x8000) >> 32) & 0xffff
static inline void
// R_POWERPC_ADDR16_HIGHEST: ((Symbol + Addend) >> 48) & 0xffff
static inline void
addr16_hi3(unsigned char* view, Address value)
- { This::template rela<16>(view, 48, 0xffff, value, check_none); }
+ { This::template rela<16>(view, 48, 0xffff, value, CHECK_NONE); }
// R_POWERPC_ADDR16_HIGHESTA: ((Symbol + Addend + 0x8000) >> 48) & 0xffff
static inline void
{ This::addr16_hi3(view, value + 0x8000); }
// R_POWERPC_ADDR14: (Symbol + Addend) & 0xfffc
- static inline enum overflow_status
- addr14(unsigned char* view, Address value, enum overflow_check overflow)
+ static inline Status
+ addr14(unsigned char* view, Address value, Overflow_check overflow)
{
- enum overflow_status stat
- = This::template rela<32>(view, 0, 0xfffc, value, overflow);
- if (overflow != check_none && (value & 3) != 0)
- stat = status_overflow;
+ Status stat = This::template rela<32>(view, 0, 0xfffc, value, overflow);
+ if (overflow != CHECK_NONE && (value & 3) != 0)
+ stat = STATUS_OVERFLOW;
return stat;
}
};
const int reloc_size
= Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ Address expected_off = 0;
+ bool regular = true;
+ unsigned int opd_ent_size = 0;
for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
{
&is_ordinary);
this->set_opd_ent(reloc.get_r_offset(), shndx,
value + reloc.get_r_addend());
+ if (i == 2)
+ {
+ expected_off = reloc.get_r_offset();
+ opd_ent_size = expected_off;
+ }
+ else if (expected_off != reloc.get_r_offset())
+ regular = false;
+ expected_off += opd_ent_size;
+ }
+ else if (r_type == elfcpp::R_PPC64_TOC)
+ {
+ if (expected_off - opd_ent_size + 8 != reloc.get_r_offset())
+ regular = false;
}
+ else
+ {
+ gold_warning(_("%s: unexpected reloc type %u in .opd section"),
+ this->name().c_str(), r_type);
+ regular = false;
+ }
+ }
+ if (reloc_count <= 2)
+ opd_ent_size = this->section_size(this->opd_shndx());
+ if (opd_ent_size != 24 && opd_ent_size != 16)
+ regular = false;
+ if (!regular)
+ {
+ gold_warning(_("%s: .opd is not a regular array of opd entries"),
+ this->name().c_str());
+ opd_ent_size = 0;
}
}
}
{
if (p->data_shndx == this->opd_shndx())
{
- this->init_opd(this->section_size(this->opd_shndx()));
- this->scan_opd_relocs(p->reloc_count, p->contents->data(),
- rd->local_symbols->data());
+ uint64_t opd_size = this->section_size(this->opd_shndx());
+ gold_assert(opd_size == static_cast<size_t>(opd_size));
+ if (opd_size != 0)
+ {
+ this->init_opd(opd_size);
+ this->scan_opd_relocs(p->reloc_count, p->contents->data(),
+ rd->local_symbols->data());
+ }
break;
}
}
}
}
+// Set up some symbols.
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::do_define_standard_symbols(
+ Symbol_table* symtab,
+ Layout* layout)
+{
+ if (size == 32)
+ {
+ // Define _GLOBAL_OFFSET_TABLE_ to ensure it isn't seen as
+ // undefined when scanning relocs (and thus requires
+ // non-relative dynamic relocs). The proper value will be
+ // updated later.
+ Symbol *gotsym = symtab->lookup("_GLOBAL_OFFSET_TABLE_", NULL);
+ if (gotsym != NULL && gotsym->is_undefined())
+ {
+ Target_powerpc<size, big_endian>* target =
+ static_cast<Target_powerpc<size, big_endian>*>(
+ parameters->sized_target<size, big_endian>());
+ Output_data_got_powerpc<size, big_endian>* got
+ = target->got_section(symtab, layout);
+ symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
+ Symbol_table::PREDEFINED,
+ got, 0, 0,
+ elfcpp::STT_OBJECT,
+ elfcpp::STB_LOCAL,
+ elfcpp::STV_HIDDEN, 0,
+ false, false);
+ }
+
+ // Define _SDA_BASE_ at the start of the .sdata section + 32768.
+ Symbol *sdasym = symtab->lookup("_SDA_BASE_", NULL);
+ if (sdasym != NULL && sdasym->is_undefined())
+ {
+ Output_data_space* sdata = new Output_data_space(4, "** sdata");
+ Output_section* os
+ = layout->add_output_section_data(".sdata", 0,
+ elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE,
+ sdata, ORDER_SMALL_DATA, false);
+ symtab->define_in_output_data("_SDA_BASE_", NULL,
+ Symbol_table::PREDEFINED,
+ os, 32768, 0, elfcpp::STT_OBJECT,
+ elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN,
+ 0, false, false);
+ }
+ }
+}
+
// Set up PowerPC target specific relobj.
template<int size, bool big_endian>
symtab_(symtab), layout_(layout),
header_ent_cnt_(size == 32 ? 3 : 1),
header_index_(size == 32 ? 0x2000 : 0)
- {}
+ { }
class Got_entry;
// Offset of base used to access the GOT/TOC.
// The got/toc pointer reg will be set to this value.
- typename elfcpp::Elf_types<size>::Elf_Off
+ Valtype
got_base_offset(const Powerpc_relobj<size, big_endian>* object) const
{
if (size == 32)
void
do_write(Output_file* of)
{
- this->replace_constant(this->header_index_,
- (size == 32
- ? this->layout_->dynamic_section()->address()
- : this->output_section()->address() + 0x8000));
-
+ Valtype val = 0;
+ if (size == 32 && this->layout_->dynamic_data() != NULL)
+ val = this->layout_->dynamic_section()->address();
+ if (size == 64)
+ val = this->output_section()->address() + 0x8000;
+ this->replace_constant(this->header_index_, val);
Output_data_got<size, big_endian>::do_write(of);
}
Output_data_got<size, big_endian>::add_constant(0);
// Define _GLOBAL_OFFSET_TABLE_ at the header
- this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
- Symbol_table::PREDEFINED,
- this, this->g_o_t(), 0,
- elfcpp::STT_OBJECT,
- elfcpp::STB_LOCAL,
- elfcpp::STV_HIDDEN,
- 0, false, false);
+ Symbol *gotsym = this->symtab_->lookup("_GLOBAL_OFFSET_TABLE_", NULL);
+ if (gotsym != NULL)
+ {
+ Sized_symbol<size>* sym = static_cast<Sized_symbol<size>*>(gotsym);
+ sym->set_value(this->g_o_t());
+ }
+ else
+ this->symtab_->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
+ Symbol_table::PREDEFINED,
+ this, this->g_o_t(), 0,
+ elfcpp::STT_OBJECT,
+ elfcpp::STB_LOCAL,
+ elfcpp::STV_HIDDEN, 0,
+ false, false);
}
else
Output_data_got<size, big_endian>::add_constant(0);
return this->rela_dyn_;
}
-// A class to handle the PLT data.
-
-template<int size, bool big_endian>
-class Output_data_plt_powerpc : public Output_section_data_build
+class Stub_control
{
public:
- typedef Output_data_reloc<elfcpp::SHT_RELA, true,
- size, big_endian> Reloc_section;
-
- Output_data_plt_powerpc(Layout*, Target_powerpc<size, big_endian>*);
-
- // Add an entry to the PLT.
- void
- add_entry(Symbol*);
-
- // Return the .rela.plt section data.
- const Reloc_section*
- rel_plt() const
+ // Determine the stub group size. The group size is the absolute
+ // value of the parameter --stub-group-size. If --stub-group-size
+ // is passed a negative value, we restrict stubs to be always before
+ // the stubbed branches.
+ Stub_control(int32_t size)
+ : state_(NO_GROUP), stub_group_size_(abs(size)),
+ stub14_group_size_(abs(size)),
+ stubs_always_before_branch_(size < 0), suppress_size_errors_(false),
+ group_end_addr_(0), owner_(NULL), output_section_(NULL)
{
- return this->rel_;
+ if (stub_group_size_ == 1)
+ {
+ // Default values.
+ if (stubs_always_before_branch_)
+ {
+ stub_group_size_ = 0x1e00000;
+ stub14_group_size_ = 0x7800;
+ }
+ else
+ {
+ stub_group_size_ = 0x1c00000;
+ stub14_group_size_ = 0x7000;
+ }
+ suppress_size_errors_ = true;
+ }
}
- // Return the number of PLT entries.
- unsigned int
- entry_count() const
- {
- return ((this->current_data_size() - initial_plt_entry_size)
- / plt_entry_size);
- }
+ // Return true iff input section can be handled by current stub
+ // group.
+ bool
+ can_add_to_stub_group(Output_section* o,
+ const Output_section::Input_section* i,
+ bool has14);
- // Return the offset of the first non-reserved PLT entry.
- static unsigned int
- first_plt_entry_offset()
- { return initial_plt_entry_size; }
+ const Output_section::Input_section*
+ owner()
+ { return owner_; }
- // Return the size of a PLT entry.
- static unsigned int
- get_plt_entry_size()
- { return plt_entry_size; }
+ Output_section*
+ output_section()
+ { return output_section_; }
- protected:
- void
- do_adjust_output_section(Output_section* os)
+ private:
+ typedef enum
{
- os->set_entsize(0);
- }
+ NO_GROUP,
+ FINDING_STUB_SECTION,
+ HAS_STUB_SECTION
+ } State;
+
+ State state_;
+ uint32_t stub_group_size_;
+ uint32_t stub14_group_size_;
+ bool stubs_always_before_branch_;
+ bool suppress_size_errors_;
+ uint64_t group_end_addr_;
+ const Output_section::Input_section* owner_;
+ Output_section* output_section_;
+};
- // Write to a map file.
- void
- do_print_to_mapfile(Mapfile* mapfile) const
- { mapfile->print_output_data(this, _("** PLT")); }
+// Return true iff input section can be handled by current stub/
+// group.
- private:
- // The size of an entry in the PLT.
- static const int plt_entry_size = size == 32 ? 4 : 24;
- // The size of the first reserved entry.
- static const int initial_plt_entry_size = size == 32 ? 0 : 24;
+bool
+Stub_control::can_add_to_stub_group(Output_section* o,
+ const Output_section::Input_section* i,
+ bool has14)
+{
+ uint32_t group_size
+ = has14 ? this->stub14_group_size_ : this->stub_group_size_;
+ bool whole_sec = o->order() == ORDER_INIT || o->order() == ORDER_FINI;
+ uint64_t this_size;
+ uint64_t start_addr = o->address();
+
+ if (whole_sec)
+ // .init and .fini sections are pasted together to form a single
+ // function. We can't be adding stubs in the middle of the function.
+ this_size = o->data_size();
+ else
+ {
+ start_addr += i->relobj()->output_section_offset(i->shndx());
+ this_size = i->data_size();
+ }
+ uint64_t end_addr = start_addr + this_size;
+ bool toobig = this_size > group_size;
- // Write out the PLT data.
- void
- do_write(Output_file*);
+ if (toobig && !this->suppress_size_errors_)
+ gold_warning(_("%s:%s exceeds group size"),
+ i->relobj()->name().c_str(),
+ i->relobj()->section_name(i->shndx()).c_str());
+
+ if (this->state_ != HAS_STUB_SECTION
+ && (!whole_sec || this->output_section_ != o))
+ {
+ this->owner_ = i;
+ this->output_section_ = o;
+ }
+
+ if (this->state_ == NO_GROUP)
+ {
+ this->state_ = FINDING_STUB_SECTION;
+ this->group_end_addr_ = end_addr;
+ }
+ else if (this->group_end_addr_ - start_addr < group_size)
+ ;
+ // Adding this section would make the group larger than GROUP_SIZE.
+ else if (this->state_ == FINDING_STUB_SECTION
+ && !this->stubs_always_before_branch_
+ && !toobig)
+ {
+ // But wait, there's more! Input sections up to GROUP_SIZE
+ // bytes before the stub table can be handled by it too.
+ this->state_ = HAS_STUB_SECTION;
+ this->group_end_addr_ = end_addr;
+ }
+ else
+ {
+ this->state_ = NO_GROUP;
+ return false;
+ }
+ return true;
+}
+
+// Look over all the input sections, deciding where to place stubs.
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::group_sections(Layout* layout,
+ const Task*)
+{
+ Stub_control stub_control(parameters->options().stub_group_size());
+
+ // Group input sections and insert stub table
+ Stub_table<size, big_endian>* stub_table = NULL;
+ Layout::Section_list section_list;
+ layout->get_executable_sections(§ion_list);
+ std::stable_sort(section_list.begin(), section_list.end(), Sort_sections());
+ for (Layout::Section_list::reverse_iterator o = section_list.rbegin();
+ o != section_list.rend();
+ ++o)
+ {
+ typedef Output_section::Input_section_list Input_section_list;
+ for (Input_section_list::const_reverse_iterator i
+ = (*o)->input_sections().rbegin();
+ i != (*o)->input_sections().rend();
+ ++i)
+ {
+ if (i->is_input_section())
+ {
+ Powerpc_relobj<size, big_endian>* ppcobj = static_cast
+ <Powerpc_relobj<size, big_endian>*>(i->relobj());
+ bool has14 = ppcobj->has_14bit_branch(i->shndx());
+ if (!stub_control.can_add_to_stub_group(*o, &*i, has14))
+ {
+ stub_table->init(stub_control.owner(),
+ stub_control.output_section());
+ stub_table = NULL;
+ }
+ if (stub_table == NULL)
+ stub_table = this->new_stub_table();
+ ppcobj->set_stub_table(i->shndx(), stub_table);
+ }
+ }
+ }
+ if (stub_table != NULL)
+ stub_table->init(stub_control.owner(), stub_control.output_section());
+}
+
+// If this branch needs a plt call stub, or a long branch stub, make one.
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::Branch_info::make_stub(
+ Stub_table<size, big_endian>* stub_table,
+ Stub_table<size, big_endian>* ifunc_stub_table,
+ Symbol_table* symtab) const
+{
+ Symbol* sym = this->object_->global_symbol(this->r_sym_);
+ if (sym != NULL && sym->is_forwarder())
+ sym = symtab->resolve_forwards(sym);
+ const Sized_symbol<size>* gsym = static_cast<const Sized_symbol<size>*>(sym);
+ if (gsym != NULL
+ ? use_plt_offset<size>(gsym, Scan::get_reference_flags(this->r_type_))
+ : this->object_->local_has_plt_offset(this->r_sym_))
+ {
+ if (stub_table == NULL)
+ stub_table = this->object_->stub_table(this->shndx_);
+ if (stub_table == NULL)
+ {
+ // This is a ref from a data section to an ifunc symbol.
+ stub_table = ifunc_stub_table;
+ }
+ gold_assert(stub_table != NULL);
+ if (gsym != NULL)
+ stub_table->add_plt_call_entry(this->object_, gsym,
+ this->r_type_, this->addend_);
+ else
+ stub_table->add_plt_call_entry(this->object_, this->r_sym_,
+ this->r_type_, this->addend_);
+ }
+ else
+ {
+ unsigned int max_branch_offset;
+ if (this->r_type_ == elfcpp::R_POWERPC_REL14
+ || this->r_type_ == elfcpp::R_POWERPC_REL14_BRTAKEN
+ || this->r_type_ == elfcpp::R_POWERPC_REL14_BRNTAKEN)
+ max_branch_offset = 1 << 15;
+ else if (this->r_type_ == elfcpp::R_POWERPC_REL24
+ || this->r_type_ == elfcpp::R_PPC_PLTREL24
+ || this->r_type_ == elfcpp::R_PPC_LOCAL24PC)
+ max_branch_offset = 1 << 25;
+ else
+ return;
+ Address from = this->object_->get_output_section_offset(this->shndx_);
+ gold_assert(from != invalid_address);
+ from += (this->object_->output_section(this->shndx_)->address()
+ + this->offset_);
+ Address to;
+ if (gsym != NULL)
+ {
+ switch (gsym->source())
+ {
+ case Symbol::FROM_OBJECT:
+ {
+ Object* symobj = gsym->object();
+ if (symobj->is_dynamic()
+ || symobj->pluginobj() != NULL)
+ return;
+ bool is_ordinary;
+ unsigned int shndx = gsym->shndx(&is_ordinary);
+ if (shndx == elfcpp::SHN_UNDEF)
+ return;
+ }
+ break;
+
+ case Symbol::IS_UNDEFINED:
+ return;
+
+ default:
+ break;
+ }
+ Symbol_table::Compute_final_value_status status;
+ to = symtab->compute_final_value<size>(gsym, &status);
+ if (status != Symbol_table::CFVS_OK)
+ return;
+ }
+ else
+ {
+ const Symbol_value<size>* psymval
+ = this->object_->local_symbol(this->r_sym_);
+ Symbol_value<size> symval;
+ typedef Sized_relobj_file<size, big_endian> ObjType;
+ typename ObjType::Compute_final_local_value_status status
+ = this->object_->compute_final_local_value(this->r_sym_, psymval,
+ &symval, symtab);
+ if (status != ObjType::CFLV_OK
+ || !symval.has_output_value())
+ return;
+ to = symval.value(this->object_, 0);
+ }
+ to += this->addend_;
+ if (stub_table == NULL)
+ stub_table = this->object_->stub_table(this->shndx_);
+ gold_assert(stub_table != NULL);
+ if (size == 64 && is_branch_reloc(this->r_type_))
+ {
+ unsigned int dest_shndx;
+ to = stub_table->targ()->symval_for_branch(to, gsym, this->object_,
+ &dest_shndx);
+ }
+ Address delta = to - from;
+ if (delta + max_branch_offset >= 2 * max_branch_offset)
+ {
+ stub_table->add_long_branch_entry(this->object_, to);
+ }
+ }
+}
+
+// Relaxation hook. This is where we do stub generation.
+
+template<int size, bool big_endian>
+bool
+Target_powerpc<size, big_endian>::do_relax(int pass,
+ const Input_objects*,
+ Symbol_table* symtab,
+ Layout* layout,
+ const Task* task)
+{
+ unsigned int prev_brlt_size = 0;
+ if (pass == 1)
+ {
+ bool thread_safe = parameters->options().plt_thread_safe();
+ if (size == 64 && !parameters->options().user_set_plt_thread_safe())
+ {
+ const char* const thread_starter[] =
+ {
+ "pthread_create",
+ /* libstdc++ */
+ "_ZNSt6thread15_M_start_threadESt10shared_ptrINS_10_Impl_baseEE",
+ /* librt */
+ "aio_init", "aio_read", "aio_write", "aio_fsync", "lio_listio",
+ "mq_notify", "create_timer",
+ /* libanl */
+ "getaddrinfo_a",
+ /* libgomp */
+ "GOMP_parallel_start",
+ "GOMP_parallel_loop_static_start",
+ "GOMP_parallel_loop_dynamic_start",
+ "GOMP_parallel_loop_guided_start",
+ "GOMP_parallel_loop_runtime_start",
+ "GOMP_parallel_sections_start",
+ };
+
+ for (unsigned int i = 0;
+ i < sizeof(thread_starter) / sizeof(thread_starter[0]);
+ i++)
+ {
+ Symbol* sym = symtab->lookup(thread_starter[i], NULL);
+ thread_safe = sym != NULL && sym->in_reg() && sym->in_real_elf();
+ if (thread_safe)
+ break;
+ }
+ }
+ this->plt_thread_safe_ = thread_safe;
+ this->group_sections(layout, task);
+ }
+
+ // We need address of stub tables valid for make_stub.
+ for (typename Stub_tables::iterator p = this->stub_tables_.begin();
+ p != this->stub_tables_.end();
+ ++p)
+ {
+ const Powerpc_relobj<size, big_endian>* object
+ = static_cast<const Powerpc_relobj<size, big_endian>*>((*p)->relobj());
+ Address off = object->get_output_section_offset((*p)->shndx());
+ gold_assert(off != invalid_address);
+ Output_section* os = (*p)->output_section();
+ (*p)->set_address_and_size(os, off);
+ }
+
+ if (pass != 1)
+ {
+ // Clear plt call stubs, long branch stubs and branch lookup table.
+ prev_brlt_size = this->branch_lookup_table_.size();
+ this->branch_lookup_table_.clear();
+ for (typename Stub_tables::iterator p = this->stub_tables_.begin();
+ p != this->stub_tables_.end();
+ ++p)
+ {
+ (*p)->clear_stubs();
+ }
+ }
+
+ // Build all the stubs.
+ Stub_table<size, big_endian>* ifunc_stub_table
+ = this->stub_tables_.size() == 0 ? NULL : this->stub_tables_[0];
+ Stub_table<size, big_endian>* one_stub_table
+ = this->stub_tables_.size() != 1 ? NULL : ifunc_stub_table;
+ for (typename Branches::const_iterator b = this->branch_info_.begin();
+ b != this->branch_info_.end();
+ b++)
+ {
+ b->make_stub(one_stub_table, ifunc_stub_table, symtab);
+ }
+
+ // Did anything change size?
+ unsigned int num_huge_branches = this->branch_lookup_table_.size();
+ bool again = num_huge_branches != prev_brlt_size;
+ if (size == 64 && num_huge_branches != 0)
+ this->make_brlt_section(layout);
+ if (size == 64 && again)
+ this->brlt_section_->set_current_size(num_huge_branches);
+
+ typedef Unordered_set<Output_section*> Output_sections;
+ Output_sections os_need_update;
+ for (typename Stub_tables::iterator p = this->stub_tables_.begin();
+ p != this->stub_tables_.end();
+ ++p)
+ {
+ if ((*p)->size_update())
+ {
+ again = true;
+ os_need_update.insert((*p)->output_section());
+ }
+ }
+
+ // Set output section offsets for all input sections in an output
+ // section that just changed size. Anything past the stubs will
+ // need updating.
+ for (typename Output_sections::iterator p = os_need_update.begin();
+ p != os_need_update.end();
+ p++)
+ {
+ Output_section* os = *p;
+ Address off = 0;
+ typedef Output_section::Input_section_list Input_section_list;
+ for (Input_section_list::const_iterator i = os->input_sections().begin();
+ i != os->input_sections().end();
+ ++i)
+ {
+ off = align_address(off, i->addralign());
+ if (i->is_input_section() || i->is_relaxed_input_section())
+ i->relobj()->set_section_offset(i->shndx(), off);
+ if (i->is_relaxed_input_section())
+ {
+ Stub_table<size, big_endian>* stub_table
+ = static_cast<Stub_table<size, big_endian>*>(
+ i->relaxed_input_section());
+ off += stub_table->set_address_and_size(os, off);
+ }
+ else
+ off += i->data_size();
+ }
+ // If .brlt is part of this output section, then we have just
+ // done the offset adjustment.
+ os->clear_section_offsets_need_adjustment();
+ }
+
+ if (size == 64
+ && !again
+ && num_huge_branches != 0
+ && parameters->options().output_is_position_independent())
+ {
+ // Fill in the BRLT relocs.
+ this->brlt_section_->reset_data_size();
+ for (typename Branch_lookup_table::const_iterator p
+ = this->branch_lookup_table_.begin();
+ p != this->branch_lookup_table_.end();
+ ++p)
+ {
+ this->brlt_section_->add_reloc(p->first, p->second);
+ }
+ this->brlt_section_->finalize_data_size();
+ }
+ return again;
+}
+
+// A class to handle the PLT data.
+
+template<int size, bool big_endian>
+class Output_data_plt_powerpc : public Output_section_data_build
+{
+ public:
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true,
+ size, big_endian> Reloc_section;
+
+ Output_data_plt_powerpc(Target_powerpc<size, big_endian>* targ,
+ Reloc_section* plt_rel,
+ unsigned int reserved_size,
+ const char* name)
+ : Output_section_data_build(size == 32 ? 4 : 8),
+ rel_(plt_rel),
+ targ_(targ),
+ initial_plt_entry_size_(reserved_size),
+ name_(name)
+ { }
+
+ // Add an entry to the PLT.
+ void
+ add_entry(Symbol*);
+
+ void
+ add_ifunc_entry(Symbol*);
+
+ void
+ add_local_ifunc_entry(Sized_relobj_file<size, big_endian>*, unsigned int);
+
+ // Return the .rela.plt section data.
+ Reloc_section*
+ rel_plt() const
+ {
+ return this->rel_;
+ }
+
+ // Return the number of PLT entries.
+ unsigned int
+ entry_count() const
+ {
+ return ((this->current_data_size() - this->initial_plt_entry_size_)
+ / plt_entry_size);
+ }
+
+ // Return the offset of the first non-reserved PLT entry.
+ unsigned int
+ first_plt_entry_offset()
+ { return this->initial_plt_entry_size_; }
+
+ // Return the size of a PLT entry.
+ static unsigned int
+ get_plt_entry_size()
+ { return plt_entry_size; }
+
+ protected:
+ void
+ do_adjust_output_section(Output_section* os)
+ {
+ os->set_entsize(0);
+ }
+
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, this->name_); }
+
+ private:
+ // The size of an entry in the PLT.
+ static const int plt_entry_size = size == 32 ? 4 : 24;
+
+ // Write out the PLT data.
+ void
+ do_write(Output_file*);
// The reloc section.
Reloc_section* rel_;
// Allows access to .glink for do_write.
Target_powerpc<size, big_endian>* targ_;
+ // The size of the first reserved entry.
+ int initial_plt_entry_size_;
+ // What to report in map file.
+ const char *name_;
};
-// Create the PLT section.
+// Add an entry to the PLT.
template<int size, bool big_endian>
-Output_data_plt_powerpc<size, big_endian>::Output_data_plt_powerpc(
- Layout* layout,
- Target_powerpc<size, big_endian>* targ)
- : Output_section_data_build(size == 32 ? 4 : 8),
- targ_(targ)
+void
+Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
{
- this->rel_ = new Reloc_section(false);
- layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
- elfcpp::SHF_ALLOC, this->rel_,
- ORDER_DYNAMIC_PLT_RELOCS, false);
+ if (!gsym->has_plt_offset())
+ {
+ section_size_type off = this->current_data_size();
+ if (off == 0)
+ off += this->first_plt_entry_offset();
+ gsym->set_plt_offset(off);
+ gsym->set_needs_dynsym_entry();
+ unsigned int dynrel = elfcpp::R_POWERPC_JMP_SLOT;
+ this->rel_->add_global(gsym, dynrel, this, off, 0);
+ off += plt_entry_size;
+ this->set_current_data_size(off);
+ }
}
-// Add an entry to the PLT.
+// Add an entry for a global ifunc symbol that resolves locally, to the IPLT.
template<int size, bool big_endian>
void
-Output_data_plt_powerpc<size, big_endian>::add_entry(Symbol* gsym)
+Output_data_plt_powerpc<size, big_endian>::add_ifunc_entry(Symbol* gsym)
{
if (!gsym->has_plt_offset())
{
- off_t off = this->current_data_size();
-
- if (off == 0)
- off += initial_plt_entry_size;
+ section_size_type off = this->current_data_size();
gsym->set_plt_offset(off);
- gsym->set_needs_dynsym_entry();
- this->rel_->add_global(gsym, elfcpp::R_POWERPC_JMP_SLOT, this, off, 0);
+ unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE;
+ if (size == 64)
+ dynrel = elfcpp::R_PPC64_JMP_IREL;
+ this->rel_->add_symbolless_global_addend(gsym, dynrel, this, off, 0);
+ off += plt_entry_size;
+ this->set_current_data_size(off);
+ }
+}
+
+// Add an entry for a local ifunc symbol to the IPLT.
+
+template<int size, bool big_endian>
+void
+Output_data_plt_powerpc<size, big_endian>::add_local_ifunc_entry(
+ Sized_relobj_file<size, big_endian>* relobj,
+ unsigned int local_sym_index)
+{
+ if (!relobj->local_has_plt_offset(local_sym_index))
+ {
+ section_size_type off = this->current_data_size();
+ relobj->set_local_plt_offset(local_sym_index, off);
+ unsigned int dynrel = elfcpp::R_POWERPC_IRELATIVE;
+ if (size == 64)
+ dynrel = elfcpp::R_PPC64_JMP_IREL;
+ this->rel_->add_symbolless_local_addend(relobj, local_sym_index, dynrel,
+ this, off, 0);
off += plt_entry_size;
this->set_current_data_size(off);
}
}
static const uint32_t add_0_11_11 = 0x7c0b5a14;
+static const uint32_t add_2_2_11 = 0x7c425a14;
static const uint32_t add_3_3_2 = 0x7c631214;
static const uint32_t add_3_3_13 = 0x7c636a14;
static const uint32_t add_11_0_11 = 0x7d605a14;
static const uint32_t add_12_2_11 = 0x7d825a14;
+static const uint32_t add_12_12_11 = 0x7d8c5a14;
static const uint32_t addi_11_11 = 0x396b0000;
static const uint32_t addi_12_12 = 0x398c0000;
static const uint32_t addi_2_2 = 0x38420000;
static const uint32_t b = 0x48000000;
static const uint32_t bcl_20_31 = 0x429f0005;
static const uint32_t bctr = 0x4e800420;
+static const uint32_t blr = 0x4e800020;
static const uint32_t blrl = 0x4e800021;
+static const uint32_t bnectr_p4 = 0x4ce20420;
+static const uint32_t cmpldi_2_0 = 0x28220000;
static const uint32_t cror_15_15_15 = 0x4def7b82;
static const uint32_t cror_31_31_31 = 0x4ffffb82;
+static const uint32_t ld_0_1 = 0xe8010000;
+static const uint32_t ld_0_12 = 0xe80c0000;
static const uint32_t ld_11_12 = 0xe96c0000;
static const uint32_t ld_11_2 = 0xe9620000;
static const uint32_t ld_2_1 = 0xe8410000;
static const uint32_t ld_2_11 = 0xe84b0000;
static const uint32_t ld_2_12 = 0xe84c0000;
static const uint32_t ld_2_2 = 0xe8420000;
+static const uint32_t lfd_0_1 = 0xc8010000;
static const uint32_t li_0_0 = 0x38000000;
+static const uint32_t li_12_0 = 0x39800000;
static const uint32_t lis_0_0 = 0x3c000000;
static const uint32_t lis_11 = 0x3d600000;
static const uint32_t lis_12 = 0x3d800000;
static const uint32_t lwz_11_30 = 0x817e0000;
static const uint32_t lwz_12_12 = 0x818c0000;
static const uint32_t lwzu_0_12 = 0x840c0000;
+static const uint32_t lvx_0_12_0 = 0x7c0c00ce;
static const uint32_t mflr_0 = 0x7c0802a6;
static const uint32_t mflr_11 = 0x7d6802a6;
static const uint32_t mflr_12 = 0x7d8802a6;
static const uint32_t mtctr_0 = 0x7c0903a6;
static const uint32_t mtctr_11 = 0x7d6903a6;
+static const uint32_t mtctr_12 = 0x7d8903a6;
static const uint32_t mtlr_0 = 0x7c0803a6;
static const uint32_t mtlr_12 = 0x7d8803a6;
static const uint32_t nop = 0x60000000;
static const uint32_t ori_0_0_0 = 0x60000000;
+static const uint32_t std_0_1 = 0xf8010000;
+static const uint32_t std_0_12 = 0xf80c0000;
static const uint32_t std_2_1 = 0xf8410000;
+static const uint32_t stfd_0_1 = 0xd8010000;
+static const uint32_t stvx_0_12_0 = 0x7c0c01ce;
static const uint32_t sub_11_11_12 = 0x7d6c5850;
+static const uint32_t xor_11_11_11 = 0x7d6b5a78;
// Write out the PLT.
{
if (size == 32)
{
- const off_t offset = this->offset();
+ const section_size_type offset = this->offset();
const section_size_type oview_size
= convert_to_section_size_type(this->data_size());
unsigned char* const oview = of->get_output_view(offset, oview_size);
unsigned char* pov = oview;
unsigned char* endpov = oview + oview_size;
- // The address the .glink branch table
+ // The address of the .glink branch table
const Output_data_glink<size, big_endian>* glink
= this->targ_->glink_section();
- elfcpp::Elf_types<32>::Elf_Addr branch_tab
- = glink->address() + glink->pltresolve();
+ elfcpp::Elf_types<32>::Elf_Addr branch_tab = glink->address();
while (pov < endpov)
{
template<int size, bool big_endian>
void
-Target_powerpc<size, big_endian>::make_plt_section(Layout* layout)
+Target_powerpc<size, big_endian>::make_plt_section(Symbol_table* symtab,
+ Layout* layout)
{
if (this->plt_ == NULL)
{
+ if (this->got_ == NULL)
+ this->got_section(symtab, layout);
+
if (this->glink_ == NULL)
make_glink_section(layout);
// needs to include .rela.plt in it's range.
this->rela_dyn_section(layout);
- this->plt_ = new Output_data_plt_powerpc<size, big_endian>(layout, this);
+ Reloc_section* plt_rel = new Reloc_section(false);
+ layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, plt_rel,
+ ORDER_DYNAMIC_PLT_RELOCS, false);
+ this->plt_
+ = new Output_data_plt_powerpc<size, big_endian>(this, plt_rel,
+ size == 32 ? 0 : 24,
+ "** PLT");
layout->add_output_section_data(".plt",
(size == 32
? elfcpp::SHT_PROGBITS
}
}
-// A class to handle .glink.
+// Create the IPLT section.
template<int size, bool big_endian>
-class Output_data_glink : public Output_section_data
+void
+Target_powerpc<size, big_endian>::make_iplt_section(Symbol_table* symtab,
+ Layout* layout)
+{
+ if (this->iplt_ == NULL)
+ {
+ this->make_plt_section(symtab, layout);
+
+ Reloc_section* iplt_rel = new Reloc_section(false);
+ this->rela_dyn_->output_section()->add_output_section_data(iplt_rel);
+ this->iplt_
+ = new Output_data_plt_powerpc<size, big_endian>(this, iplt_rel,
+ 0, "** IPLT");
+ this->plt_->output_section()->add_output_section_data(this->iplt_);
+ }
+}
+
+// A section for huge long branch addresses, similar to plt section.
+
+template<int size, bool big_endian>
+class Output_data_brlt_powerpc : public Output_section_data_build
{
public:
- static const int pltresolve_size = 16*4;
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true,
+ size, big_endian> Reloc_section;
- Output_data_glink(Target_powerpc<size, big_endian>*);
+ Output_data_brlt_powerpc(Target_powerpc<size, big_endian>* targ,
+ Reloc_section* brlt_rel)
+ : Output_section_data_build(size == 32 ? 4 : 8),
+ rel_(brlt_rel),
+ targ_(targ)
+ { }
- // Add an entry
+ // Add a reloc for an entry in the BRLT.
void
- add_entry(const Symbol*, const elfcpp::Rela<size, big_endian>&,
- const Sized_relobj<size, big_endian>*);
-
- unsigned int
- find_entry(const Symbol*, const elfcpp::Rela<size, big_endian>&,
- const Sized_relobj<size, big_endian>*) const;
+ add_reloc(Address to, unsigned int off)
+ { this->rel_->add_relative(elfcpp::R_POWERPC_RELATIVE, this, off, to); }
- unsigned int
- glink_entry_size() const
+ // Update section and reloc section size.
+ void
+ set_current_size(unsigned int num_branches)
{
- if (size == 32)
- return 4 * 4;
- else
- // FIXME: We should be using multiple glink sections for
- // stubs to support > 33M applications.
- return 8 * 4;
+ this->reset_address_and_file_offset();
+ this->set_current_data_size(num_branches * 16);
+ this->finalize_data_size();
+ Output_section* os = this->output_section();
+ os->set_section_offsets_need_adjustment();
+ if (this->rel_ != NULL)
+ {
+ unsigned int reloc_size
+ = Reloc_types<elfcpp::SHT_RELA, size, big_endian>::reloc_size;
+ this->rel_->reset_address_and_file_offset();
+ this->rel_->set_current_data_size(num_branches * reloc_size);
+ this->rel_->finalize_data_size();
+ Output_section* os = this->rel_->output_section();
+ os->set_section_offsets_need_adjustment();
+ }
}
- off_t
- pltresolve() const
+ protected:
+ void
+ do_adjust_output_section(Output_section* os)
{
- return this->pltresolve_;
+ os->set_entsize(0);
}
- protected:
// Write to a map file.
void
do_print_to_mapfile(Mapfile* mapfile) const
- { mapfile->print_output_data(this, _("** glink")); }
+ { mapfile->print_output_data(this, "** BRLT"); }
private:
- void
- set_final_data_size();
-
- // Write out .glink
+ // Write out the BRLT data.
void
do_write(Output_file*);
- class Glink_sym_ent
- {
- public:
- Glink_sym_ent(const Symbol* sym,
- const elfcpp::Rela<size, big_endian>& reloc,
- const Sized_relobj<size, big_endian>* object)
- : sym_(sym), addend_(0), object_(0)
+ // The reloc section.
+ Reloc_section* rel_;
+ Target_powerpc<size, big_endian>* targ_;
+};
+
+// Make the branch lookup table section.
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::make_brlt_section(Layout* layout)
+{
+ if (size == 64 && this->brlt_section_ == NULL)
{
- if (size != 32)
- this->addend_ = reloc.get_r_addend();
- else if (parameters->options().output_is_position_independent()
- && (elfcpp::elf_r_type<size>(reloc.get_r_info())
- == elfcpp::R_PPC_PLTREL24))
+ Reloc_section* brlt_rel = NULL;
+ bool is_pic = parameters->options().output_is_position_independent();
+ if (is_pic)
{
- this->addend_ = reloc.get_r_addend();
- if (this->addend_ != 0)
- this->object_ = object;
+ // When PIC we can't fill in .brlt (like .plt it can be a
+ // bss style section) but must initialise at runtime via
+ // dynamic relocats.
+ this->rela_dyn_section(layout);
+ brlt_rel = new Reloc_section(false);
+ this->rela_dyn_->output_section()->add_output_section_data(brlt_rel);
}
+ this->brlt_section_
+ = new Output_data_brlt_powerpc<size, big_endian>(this, brlt_rel);
+ if (this->plt_ && is_pic)
+ this->plt_->output_section()
+ ->add_output_section_data(this->brlt_section_);
+ else
+ layout->add_output_section_data(".brlt",
+ (is_pic ? elfcpp::SHT_NOBITS
+ : elfcpp::SHT_PROGBITS),
+ elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
+ this->brlt_section_,
+ (is_pic ? ORDER_SMALL_BSS
+ : ORDER_SMALL_DATA),
+ false);
}
+}
- bool operator==(const Glink_sym_ent& that) const
- {
- return (this->sym_ == that.sym_
- && this->object_ == that.object_
- && this->addend_ == that.addend_);
- }
+// Write out .brlt when non-PIC.
- const Symbol* sym_;
- unsigned int addend_;
- const Sized_relobj<size, big_endian>* object_;
+template<int size, bool big_endian>
+void
+Output_data_brlt_powerpc<size, big_endian>::do_write(Output_file* of)
+{
+ if (size == 64 && !parameters->options().output_is_position_independent())
+ {
+ const section_size_type offset = this->offset();
+ const section_size_type oview_size
+ = convert_to_section_size_type(this->data_size());
+ unsigned char* const oview = of->get_output_view(offset, oview_size);
+
+ this->targ_->write_branch_lookup_table(oview);
+ of->write_output_view(offset, oview_size, oview);
+ }
+}
+
+static inline uint32_t
+l(uint32_t a)
+{
+ return a & 0xffff;
+}
+
+static inline uint32_t
+hi(uint32_t a)
+{
+ return l(a >> 16);
+}
+
+static inline uint32_t
+ha(uint32_t a)
+{
+ return hi(a + 0x8000);
+}
+
+template<bool big_endian>
+static inline void
+write_insn(unsigned char* p, uint32_t v)
+{
+ elfcpp::Swap<32, big_endian>::writeval(p, v);
+}
+
+// Stub_table holds information about plt and long branch stubs.
+// Stubs are built in an area following some input section determined
+// by group_sections(). This input section is converted to a relaxed
+// input section allowing it to be resized to accommodate the stubs
+
+template<int size, bool big_endian>
+class Stub_table : public Output_relaxed_input_section
+{
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+ static const Address invalid_address = static_cast<Address>(0) - 1;
+
+ Stub_table(Target_powerpc<size, big_endian>* targ)
+ : Output_relaxed_input_section(NULL, 0, 0),
+ targ_(targ), plt_call_stubs_(), long_branch_stubs_(),
+ orig_data_size_(0), plt_size_(0), last_plt_size_(0),
+ branch_size_(0), last_branch_size_(0)
+ { }
+
+ // Delayed Output_relaxed_input_section init.
+ void
+ init(const Output_section::Input_section*, Output_section*);
+
+ // Add a plt call stub.
+ void
+ add_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
+ const Symbol*,
+ unsigned int,
+ Address);
+
+ void
+ add_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
+ unsigned int,
+ unsigned int,
+ Address);
+
+ // Find a given plt call stub.
+ Address
+ find_plt_call_entry(const Symbol*) const;
+
+ Address
+ find_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
+ unsigned int) const;
+
+ Address
+ find_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
+ const Symbol*,
+ unsigned int,
+ Address) const;
+
+ Address
+ find_plt_call_entry(const Sized_relobj_file<size, big_endian>*,
+ unsigned int,
+ unsigned int,
+ Address) const;
+
+ // Add a long branch stub.
+ void
+ add_long_branch_entry(const Powerpc_relobj<size, big_endian>*, Address);
+
+ Address
+ find_long_branch_entry(const Powerpc_relobj<size, big_endian>*, Address);
+
+ void
+ clear_stubs()
+ {
+ this->plt_call_stubs_.clear();
+ this->plt_size_ = 0;
+ this->long_branch_stubs_.clear();
+ this->branch_size_ = 0;
+ }
+
+ Address
+ set_address_and_size(const Output_section* os, Address off)
+ {
+ Address start_off = off;
+ off += this->orig_data_size_;
+ Address my_size = this->plt_size_ + this->branch_size_;
+ if (my_size != 0)
+ off = align_address(off, this->stub_align());
+ // Include original section size and alignment padding in size
+ my_size += off - start_off;
+ this->reset_address_and_file_offset();
+ this->set_current_data_size(my_size);
+ this->set_address_and_file_offset(os->address() + start_off,
+ os->offset() + start_off);
+ return my_size;
+ }
+
+ Address
+ stub_address()
+ {
+ return align_address(this->address() + this->orig_data_size_,
+ this->stub_align());
+ }
+
+ Address
+ stub_offset()
+ {
+ return align_address(this->offset() + this->orig_data_size_,
+ this->stub_align());
+ }
+
+ section_size_type
+ plt_size() const
+ { return this->plt_size_; }
+
+ bool
+ size_update()
+ {
+ Output_section* os = this->output_section();
+ if (os->addralign() < this->stub_align())
+ {
+ os->set_addralign(this->stub_align());
+ // FIXME: get rid of the insane checkpointing.
+ // We can't increase alignment of the input section to which
+ // stubs are attached; The input section may be .init which
+ // is pasted together with other .init sections to form a
+ // function. Aligning might insert zero padding resulting in
+ // sigill. However we do need to increase alignment of the
+ // output section so that the align_address() on offset in
+ // set_address_and_size() adds the same padding as the
+ // align_address() on address in stub_address().
+ // What's more, we need this alignment for the layout done in
+ // relaxation_loop_body() so that the output section starts at
+ // a suitably aligned address.
+ os->checkpoint_set_addralign(this->stub_align());
+ }
+ if (this->last_plt_size_ != this->plt_size_
+ || this->last_branch_size_ != this->branch_size_)
+ {
+ this->last_plt_size_ = this->plt_size_;
+ this->last_branch_size_ = this->branch_size_;
+ return true;
+ }
+ return false;
+ }
+
+ Target_powerpc<size, big_endian>*
+ targ() const
+ { return targ_; }
+
+ private:
+ class Plt_stub_ent;
+ class Plt_stub_ent_hash;
+ typedef Unordered_map<Plt_stub_ent, unsigned int,
+ Plt_stub_ent_hash> Plt_stub_entries;
+
+ // Alignment of stub section.
+ unsigned int
+ stub_align() const
+ {
+ if (size == 32)
+ return 16;
+ unsigned int min_align = 32;
+ unsigned int user_align = 1 << parameters->options().plt_align();
+ return std::max(user_align, min_align);
+ }
+
+ // Size of a given plt call stub.
+ unsigned int
+ plt_call_size(typename Plt_stub_entries::const_iterator p) const
+ {
+ if (size == 32)
+ return 16;
+
+ Address pltaddr = p->second;
+ if (p->first.sym_ == NULL
+ || (p->first.sym_->type() == elfcpp::STT_GNU_IFUNC
+ && p->first.sym_->can_use_relative_reloc(false)))
+ pltaddr += this->targ_->iplt_section()->address();
+ else
+ pltaddr += this->targ_->plt_section()->address();
+ Address tocbase = this->targ_->got_section()->output_section()->address();
+ const Powerpc_relobj<size, big_endian>* ppcobj = static_cast
+ <const Powerpc_relobj<size, big_endian>*>(p->first.object_);
+ tocbase += ppcobj->toc_base_offset();
+ Address off = pltaddr - tocbase;
+ bool static_chain = parameters->options().plt_static_chain();
+ bool thread_safe = this->targ_->plt_thread_safe();
+ unsigned int bytes = (4 * 5
+ + 4 * static_chain
+ + 8 * thread_safe
+ + 4 * (ha(off) != 0)
+ + 4 * (ha(off + 8 + 8 * static_chain) != ha(off)));
+ unsigned int align = 1 << parameters->options().plt_align();
+ if (align > 1)
+ bytes = (bytes + align - 1) & -align;
+ return bytes;
+ }
+
+ // Return long branch stub size.
+ unsigned int
+ branch_stub_size(Address to)
+ {
+ Address loc
+ = this->stub_address() + this->last_plt_size_ + this->branch_size_;
+ if (to - loc + (1 << 25) < 2 << 25)
+ return 4;
+ if (size == 64 || !parameters->options().output_is_position_independent())
+ return 16;
+ return 32;
+ }
+
+ // Write out stubs.
+ void
+ do_write(Output_file*);
+
+ // Plt call stub keys.
+ class Plt_stub_ent
+ {
+ public:
+ Plt_stub_ent(const Symbol* sym)
+ : sym_(sym), object_(0), addend_(0), locsym_(0)
+ { }
+
+ Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object,
+ unsigned int locsym_index)
+ : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index)
+ { }
+
+ Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object,
+ const Symbol* sym,
+ unsigned int r_type,
+ Address addend)
+ : sym_(sym), object_(0), addend_(0), locsym_(0)
+ {
+ if (size != 32)
+ this->addend_ = addend;
+ else if (parameters->options().output_is_position_independent()
+ && r_type == elfcpp::R_PPC_PLTREL24)
+ {
+ this->addend_ = addend;
+ if (this->addend_ >= 32768)
+ this->object_ = object;
+ }
+ }
+
+ Plt_stub_ent(const Sized_relobj_file<size, big_endian>* object,
+ unsigned int locsym_index,
+ unsigned int r_type,
+ Address addend)
+ : sym_(NULL), object_(object), addend_(0), locsym_(locsym_index)
+ {
+ if (size != 32)
+ this->addend_ = addend;
+ else if (parameters->options().output_is_position_independent()
+ && r_type == elfcpp::R_PPC_PLTREL24)
+ this->addend_ = addend;
+ }
+
+ bool operator==(const Plt_stub_ent& that) const
+ {
+ return (this->sym_ == that.sym_
+ && this->object_ == that.object_
+ && this->addend_ == that.addend_
+ && this->locsym_ == that.locsym_);
+ }
+
+ const Symbol* sym_;
+ const Sized_relobj_file<size, big_endian>* object_;
+ typename elfcpp::Elf_types<size>::Elf_Addr addend_;
+ unsigned int locsym_;
};
- class Glink_sym_ent_hash
+ class Plt_stub_ent_hash
{
public:
- size_t operator()(const Glink_sym_ent& ent) const
+ size_t operator()(const Plt_stub_ent& ent) const
{
return (reinterpret_cast<uintptr_t>(ent.sym_)
^ reinterpret_cast<uintptr_t>(ent.object_)
- ^ ent.addend_);
+ ^ ent.addend_
+ ^ ent.locsym_);
}
};
- // Map sym/object/addend to index.
- typedef Unordered_map<Glink_sym_ent, unsigned int,
- Glink_sym_ent_hash> Glink_entries;
- Glink_entries glink_entries_;
+ // Long branch stub keys.
+ class Branch_stub_ent
+ {
+ public:
+ Branch_stub_ent(const Powerpc_relobj<size, big_endian>* obj, Address to)
+ : dest_(to), toc_base_off_(0)
+ {
+ if (size == 64)
+ toc_base_off_ = obj->toc_base_offset();
+ }
+
+ bool operator==(const Branch_stub_ent& that) const
+ {
+ return (this->dest_ == that.dest_
+ && (size == 32
+ || this->toc_base_off_ == that.toc_base_off_));
+ }
- // Offset of pltresolve stub (actually, branch table for 32-bit)
- off_t pltresolve_;
+ Address dest_;
+ unsigned int toc_base_off_;
+ };
- // Allows access to .got and .plt for do_write.
+ class Branch_stub_ent_hash
+ {
+ public:
+ size_t operator()(const Branch_stub_ent& ent) const
+ { return ent.dest_ ^ ent.toc_base_off_; }
+ };
+
+ // In a sane world this would be a global.
Target_powerpc<size, big_endian>* targ_;
+ // Map sym/object/addend to stub offset.
+ Plt_stub_entries plt_call_stubs_;
+ // Map destination address to stub offset.
+ typedef Unordered_map<Branch_stub_ent, unsigned int,
+ Branch_stub_ent_hash> Branch_stub_entries;
+ Branch_stub_entries long_branch_stubs_;
+ // size of input section
+ section_size_type orig_data_size_;
+ // size of stubs
+ section_size_type plt_size_, last_plt_size_, branch_size_, last_branch_size_;
};
-// Create the glink section.
+// Make a new stub table, and record.
template<int size, bool big_endian>
-Output_data_glink<size, big_endian>::Output_data_glink(
- Target_powerpc<size, big_endian>* targ)
- : Output_section_data(16),
- pltresolve_(0), targ_(targ)
+Stub_table<size, big_endian>*
+Target_powerpc<size, big_endian>::new_stub_table()
{
+ Stub_table<size, big_endian>* stub_table
+ = new Stub_table<size, big_endian>(this);
+ this->stub_tables_.push_back(stub_table);
+ return stub_table;
}
-// Add an entry to glink, if we do not already have one for this
+// Delayed stub table initialisation, because we create the stub table
+// before we know to which section it will be attached.
+
+template<int size, bool big_endian>
+void
+Stub_table<size, big_endian>::init(
+ const Output_section::Input_section* owner,
+ Output_section* output_section)
+{
+ this->set_relobj(owner->relobj());
+ this->set_shndx(owner->shndx());
+ this->set_addralign(this->relobj()->section_addralign(this->shndx()));
+ this->set_output_section(output_section);
+ this->orig_data_size_ = owner->current_data_size();
+
+ std::vector<Output_relaxed_input_section*> new_relaxed;
+ new_relaxed.push_back(this);
+ output_section->convert_input_sections_to_relaxed_sections(new_relaxed);
+}
+
+// Add a plt call stub, if we do not already have one for this
// sym/object/addend combo.
template<int size, bool big_endian>
void
-Output_data_glink<size, big_endian>::add_entry(
+Stub_table<size, big_endian>::add_plt_call_entry(
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol* gsym,
- const elfcpp::Rela<size, big_endian>& reloc,
- const Sized_relobj<size, big_endian>* object)
+ unsigned int r_type,
+ Address addend)
{
- Glink_sym_ent ent(gsym, reloc, object);
- unsigned int indx = this->glink_entries_.size();
- this->glink_entries_.insert(std::make_pair(ent, indx));
+ Plt_stub_ent ent(object, gsym, r_type, addend);
+ Address off = this->plt_size_;
+ std::pair<typename Plt_stub_entries::iterator, bool> p
+ = this->plt_call_stubs_.insert(std::make_pair(ent, off));
+ if (p.second)
+ this->plt_size_ = off + this->plt_call_size(p.first);
}
template<int size, bool big_endian>
-unsigned int
-Output_data_glink<size, big_endian>::find_entry(
+void
+Stub_table<size, big_endian>::add_plt_call_entry(
+ const Sized_relobj_file<size, big_endian>* object,
+ unsigned int locsym_index,
+ unsigned int r_type,
+ Address addend)
+{
+ Plt_stub_ent ent(object, locsym_index, r_type, addend);
+ Address off = this->plt_size_;
+ std::pair<typename Plt_stub_entries::iterator, bool> p
+ = this->plt_call_stubs_.insert(std::make_pair(ent, off));
+ if (p.second)
+ this->plt_size_ = off + this->plt_call_size(p.first);
+}
+
+// Find a plt call stub.
+
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Stub_table<size, big_endian>::find_plt_call_entry(
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol* gsym,
- const elfcpp::Rela<size, big_endian>& reloc,
- const Sized_relobj<size, big_endian>* object) const
+ unsigned int r_type,
+ Address addend) const
{
- Glink_sym_ent ent(gsym, reloc, object);
- typename Glink_entries::const_iterator p = this->glink_entries_.find(ent);
- gold_assert(p != this->glink_entries_.end());
- return p->second;
+ Plt_stub_ent ent(object, gsym, r_type, addend);
+ typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
+ return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
}
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Stub_table<size, big_endian>::find_plt_call_entry(const Symbol* gsym) const
+{
+ Plt_stub_ent ent(gsym);
+ typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
+ return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
+}
+
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Stub_table<size, big_endian>::find_plt_call_entry(
+ const Sized_relobj_file<size, big_endian>* object,
+ unsigned int locsym_index,
+ unsigned int r_type,
+ Address addend) const
+{
+ Plt_stub_ent ent(object, locsym_index, r_type, addend);
+ typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
+ return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
+}
+
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Stub_table<size, big_endian>::find_plt_call_entry(
+ const Sized_relobj_file<size, big_endian>* object,
+ unsigned int locsym_index) const
+{
+ Plt_stub_ent ent(object, locsym_index);
+ typename Plt_stub_entries::const_iterator p = this->plt_call_stubs_.find(ent);
+ return p == this->plt_call_stubs_.end() ? invalid_address : p->second;
+}
+
+// Add a long branch stub if we don't already have one to given
+// destination.
+
+template<int size, bool big_endian>
+void
+Stub_table<size, big_endian>::add_long_branch_entry(
+ const Powerpc_relobj<size, big_endian>* object,
+ Address to)
+{
+ Branch_stub_ent ent(object, to);
+ Address off = this->branch_size_;
+ if (this->long_branch_stubs_.insert(std::make_pair(ent, off)).second)
+ {
+ unsigned int stub_size = this->branch_stub_size(to);
+ this->branch_size_ = off + stub_size;
+ if (size == 64 && stub_size != 4)
+ this->targ_->add_branch_lookup_table(to);
+ }
+}
+
+// Find long branch stub.
+
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Stub_table<size, big_endian>::find_long_branch_entry(
+ const Powerpc_relobj<size, big_endian>* object,
+ Address to)
+{
+ Branch_stub_ent ent(object, to);
+ typename Branch_stub_entries::const_iterator p
+ = this->long_branch_stubs_.find(ent);
+ return p == this->long_branch_stubs_.end() ? invalid_address : p->second;
+}
+
+// A class to handle .glink.
+
+template<int size, bool big_endian>
+class Output_data_glink : public Output_section_data
+{
+ public:
+ static const int pltresolve_size = 16*4;
+
+ Output_data_glink(Target_powerpc<size, big_endian>* targ)
+ : Output_section_data(16), targ_(targ)
+ { }
+
+ protected:
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** glink")); }
+
+ private:
+ void
+ set_final_data_size();
+
+ // Write out .glink
+ void
+ do_write(Output_file*);
+
+ // Allows access to .got and .plt for do_write.
+ Target_powerpc<size, big_endian>* targ_;
+};
+
template<int size, bool big_endian>
void
Output_data_glink<size, big_endian>::set_final_data_size()
{
- unsigned int count = this->glink_entries_.size();
- off_t total = count;
+ unsigned int count = this->targ_->plt_entry_count();
+ section_size_type total = 0;
if (count != 0)
{
if (size == 32)
{
- total *= 16;
- this->pltresolve_ = total;
-
// space for branch table
total += 4 * (count - 1);
}
else
{
- total *= 32;
- this->pltresolve_ = total;
total += this->pltresolve_size;
// space for branch table
this->set_data_size(total);
}
-static inline uint32_t
-l(uint32_t a)
-{
- return a & 0xffff;
-}
-
-static inline uint32_t
-hi(uint32_t a)
-{
- return l(a >> 16);
-}
-
-static inline uint32_t
-ha(uint32_t a)
-{
- return hi(a + 0x8000);
-}
-
-template<bool big_endian>
-static inline void
-write_insn(unsigned char* p, uint32_t v)
-{
- elfcpp::Swap<32, big_endian>::writeval(p, v);
-}
-
-// Write out .glink.
+// Write out plt and long branch stub code.
template<int size, bool big_endian>
void
-Output_data_glink<size, big_endian>::do_write(Output_file* of)
+Stub_table<size, big_endian>::do_write(Output_file* of)
{
- const off_t off = this->offset();
+ if (this->plt_call_stubs_.empty()
+ && this->long_branch_stubs_.empty())
+ return;
+
+ const section_size_type start_off = this->offset();
+ const section_size_type off = this->stub_offset();
const section_size_type oview_size =
- convert_to_section_size_type(this->data_size());
+ convert_to_section_size_type(this->data_size() - (off - start_off));
unsigned char* const oview = of->get_output_view(off, oview_size);
unsigned char* p;
- // The base address of the .plt section.
- typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
- Address plt_base = this->targ_->plt_section()->address();
-
- const Output_data_got_powerpc<size, big_endian>* got
- = this->targ_->got_section();
-
if (size == 64)
{
+ const Output_data_got_powerpc<size, big_endian>* got
+ = this->targ_->got_section();
Address got_os_addr = got->output_section()->address();
- // Write out call stubs.
- typename Glink_entries::const_iterator g;
- for (g = this->glink_entries_.begin();
- g != this->glink_entries_.end();
- ++g)
+ if (!this->plt_call_stubs_.empty())
{
- Address plt_addr = plt_base + g->first.sym_->plt_offset();
- const Powerpc_relobj<size, big_endian>* ppcobj = static_cast
- <const Powerpc_relobj<size, big_endian>*>(g->first.object_);
- Address got_addr = got_os_addr + ppcobj->toc_base_offset();
- Address pltoff = plt_addr - got_addr;
-
- if (pltoff + 0x80008000 > 0xffffffff || (pltoff & 7) != 0)
- gold_error(_("%s: linkage table error against `%s'"),
- g->first.object_->name().c_str(),
- g->first.sym_->demangled_name().c_str());
-
- p = oview + g->second * this->glink_entry_size();
- if (ha(pltoff) != 0)
+ // The base address of the .plt section.
+ Address plt_base = this->targ_->plt_section()->address();
+ Address iplt_base = invalid_address;
+
+ // Write out plt call stubs.
+ typename Plt_stub_entries::const_iterator cs;
+ for (cs = this->plt_call_stubs_.begin();
+ cs != this->plt_call_stubs_.end();
+ ++cs)
{
- write_insn<big_endian>(p, addis_12_2 + ha(pltoff)), p += 4;
- write_insn<big_endian>(p, std_2_1 + 40), p += 4;
- write_insn<big_endian>(p, ld_11_12 + l(pltoff)), p += 4;
- if (ha(pltoff + 16) != ha(pltoff))
+ Address pltoff;
+ bool is_ifunc;
+ const Symbol* gsym = cs->first.sym_;
+ if (gsym != NULL)
{
- write_insn<big_endian>(p, addi_12_12 + l(pltoff)), p += 4;
- pltoff = 0;
+ is_ifunc = (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false));
+ pltoff = gsym->plt_offset();
}
- write_insn<big_endian>(p, mtctr_11), p += 4;
- write_insn<big_endian>(p, ld_2_12 + l(pltoff + 8)), p += 4;
- write_insn<big_endian>(p, ld_11_12 + l(pltoff + 16)), p += 4;
- write_insn<big_endian>(p, bctr), p += 4;
+ else
+ {
+ is_ifunc = true;
+ const Sized_relobj_file<size, big_endian>* relobj
+ = cs->first.object_;
+ unsigned int local_sym_index = cs->first.locsym_;
+ pltoff = relobj->local_plt_offset(local_sym_index);
+ }
+ Address plt_addr = pltoff;
+ if (is_ifunc)
+ {
+ if (iplt_base == invalid_address)
+ iplt_base = this->targ_->iplt_section()->address();
+ plt_addr += iplt_base;
+ }
+ else
+ plt_addr += plt_base;
+ const Powerpc_relobj<size, big_endian>* ppcobj = static_cast
+ <const Powerpc_relobj<size, big_endian>*>(cs->first.object_);
+ Address got_addr = got_os_addr + ppcobj->toc_base_offset();
+ Address off = plt_addr - got_addr;
+
+ if (off + 0x80008000 > 0xffffffff || (off & 7) != 0)
+ gold_error(_("%s: linkage table error against `%s'"),
+ cs->first.object_->name().c_str(),
+ cs->first.sym_->demangled_name().c_str());
+
+ bool static_chain = parameters->options().plt_static_chain();
+ bool thread_safe = this->targ_->plt_thread_safe();
+ bool use_fake_dep = false;
+ Address cmp_branch_off = 0;
+ if (thread_safe)
+ {
+ unsigned int pltindex
+ = ((pltoff - this->targ_->first_plt_entry_offset())
+ / this->targ_->plt_entry_size());
+ Address glinkoff
+ = (this->targ_->glink_section()->pltresolve_size
+ + pltindex * 8);
+ if (pltindex > 32768)
+ glinkoff += (pltindex - 32768) * 4;
+ Address to
+ = this->targ_->glink_section()->address() + glinkoff;
+ Address from
+ = (this->stub_address() + cs->second + 24
+ + 4 * (ha(off) != 0)
+ + 4 * (ha(off + 8 + 8 * static_chain) != ha(off))
+ + 4 * static_chain);
+ cmp_branch_off = to - from;
+ use_fake_dep = cmp_branch_off + (1 << 25) >= (1 << 26);
+ }
+
+ p = oview + cs->second;
+ if (ha(off) != 0)
+ {
+ write_insn<big_endian>(p, std_2_1 + 40), p += 4;
+ write_insn<big_endian>(p, addis_12_2 + ha(off)), p += 4;
+ write_insn<big_endian>(p, ld_11_12 + l(off)), p += 4;
+ if (ha(off + 8 + 8 * static_chain) != ha(off))
+ {
+ write_insn<big_endian>(p, addi_12_12 + l(off)), p += 4;
+ off = 0;
+ }
+ write_insn<big_endian>(p, mtctr_11), p += 4;
+ if (use_fake_dep)
+ {
+ write_insn<big_endian>(p, xor_11_11_11), p += 4;
+ write_insn<big_endian>(p, add_12_12_11), p += 4;
+ }
+ write_insn<big_endian>(p, ld_2_12 + l(off + 8)), p += 4;
+ if (static_chain)
+ write_insn<big_endian>(p, ld_11_12 + l(off + 16)), p += 4;
+ }
+ else
+ {
+ write_insn<big_endian>(p, std_2_1 + 40), p += 4;
+ write_insn<big_endian>(p, ld_11_2 + l(off)), p += 4;
+ if (ha(off + 8 + 8 * static_chain) != ha(off))
+ {
+ write_insn<big_endian>(p, addi_2_2 + l(off)), p += 4;
+ off = 0;
+ }
+ write_insn<big_endian>(p, mtctr_11), p += 4;
+ if (use_fake_dep)
+ {
+ write_insn<big_endian>(p, xor_11_11_11), p += 4;
+ write_insn<big_endian>(p, add_2_2_11), p += 4;
+ }
+ if (static_chain)
+ write_insn<big_endian>(p, ld_11_2 + l(off + 16)), p += 4;
+ write_insn<big_endian>(p, ld_2_2 + l(off + 8)), p += 4;
+ }
+ if (thread_safe && !use_fake_dep)
+ {
+ write_insn<big_endian>(p, cmpldi_2_0), p += 4;
+ write_insn<big_endian>(p, bnectr_p4), p += 4;
+ write_insn<big_endian>(p, b | (cmp_branch_off & 0x3fffffc));
+ }
+ else
+ write_insn<big_endian>(p, bctr);
}
+ }
+
+ // Write out long branch stubs.
+ typename Branch_stub_entries::const_iterator bs;
+ for (bs = this->long_branch_stubs_.begin();
+ bs != this->long_branch_stubs_.end();
+ ++bs)
+ {
+ p = oview + this->plt_size_ + bs->second;
+ Address loc = this->stub_address() + this->plt_size_ + bs->second;
+ Address delta = bs->first.dest_ - loc;
+ if (delta + (1 << 25) < 2 << 25)
+ write_insn<big_endian>(p, b | (delta & 0x3fffffc));
else
{
- write_insn<big_endian>(p, std_2_1 + 40), p += 4;
- write_insn<big_endian>(p, ld_11_2 + l(pltoff)), p += 4;
- if (ha(pltoff + 16) != ha(pltoff))
+ Address brlt_addr
+ = this->targ_->find_branch_lookup_table(bs->first.dest_);
+ gold_assert(brlt_addr != invalid_address);
+ brlt_addr += this->targ_->brlt_section()->address();
+ Address got_addr = got_os_addr + bs->first.toc_base_off_;
+ Address brltoff = brlt_addr - got_addr;
+ if (ha(brltoff) == 0)
{
- write_insn<big_endian>(p, addi_2_2 + l(pltoff)), p += 4;
- pltoff = 0;
+ write_insn<big_endian>(p, ld_11_2 + l(brltoff)), p += 4;
+ }
+ else
+ {
+ write_insn<big_endian>(p, addis_12_2 + ha(brltoff)), p += 4;
+ write_insn<big_endian>(p, ld_11_12 + l(brltoff)), p += 4;
}
write_insn<big_endian>(p, mtctr_11), p += 4;
- write_insn<big_endian>(p, ld_11_2 + l(pltoff + 16)), p += 4;
- write_insn<big_endian>(p, ld_2_2 + l(pltoff + 8)), p += 4;
- write_insn<big_endian>(p, bctr), p += 4;
+ write_insn<big_endian>(p, bctr);
}
}
+ }
+ else
+ {
+ if (!this->plt_call_stubs_.empty())
+ {
+ // The base address of the .plt section.
+ Address plt_base = this->targ_->plt_section()->address();
+ Address iplt_base = invalid_address;
+ // The address of _GLOBAL_OFFSET_TABLE_.
+ Address g_o_t = invalid_address;
+
+ // Write out plt call stubs.
+ typename Plt_stub_entries::const_iterator cs;
+ for (cs = this->plt_call_stubs_.begin();
+ cs != this->plt_call_stubs_.end();
+ ++cs)
+ {
+ Address plt_addr;
+ bool is_ifunc;
+ const Symbol* gsym = cs->first.sym_;
+ if (gsym != NULL)
+ {
+ is_ifunc = (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false));
+ plt_addr = gsym->plt_offset();
+ }
+ else
+ {
+ is_ifunc = true;
+ const Sized_relobj_file<size, big_endian>* relobj
+ = cs->first.object_;
+ unsigned int local_sym_index = cs->first.locsym_;
+ plt_addr = relobj->local_plt_offset(local_sym_index);
+ }
+ if (is_ifunc)
+ {
+ if (iplt_base == invalid_address)
+ iplt_base = this->targ_->iplt_section()->address();
+ plt_addr += iplt_base;
+ }
+ else
+ plt_addr += plt_base;
+
+ p = oview + cs->second;
+ if (parameters->options().output_is_position_independent())
+ {
+ Address got_addr;
+ const Powerpc_relobj<size, big_endian>* ppcobj
+ = (static_cast<const Powerpc_relobj<size, big_endian>*>
+ (cs->first.object_));
+ if (ppcobj != NULL && cs->first.addend_ >= 32768)
+ {
+ unsigned int got2 = ppcobj->got2_shndx();
+ got_addr = ppcobj->get_output_section_offset(got2);
+ gold_assert(got_addr != invalid_address);
+ got_addr += (ppcobj->output_section(got2)->address()
+ + cs->first.addend_);
+ }
+ else
+ {
+ if (g_o_t == invalid_address)
+ {
+ const Output_data_got_powerpc<size, big_endian>* got
+ = this->targ_->got_section();
+ g_o_t = got->address() + got->g_o_t();
+ }
+ got_addr = g_o_t;
+ }
+ Address off = plt_addr - got_addr;
+ if (ha(off) == 0)
+ {
+ write_insn<big_endian>(p + 0, lwz_11_30 + l(off));
+ write_insn<big_endian>(p + 4, mtctr_11);
+ write_insn<big_endian>(p + 8, bctr);
+ }
+ else
+ {
+ write_insn<big_endian>(p + 0, addis_11_30 + ha(off));
+ write_insn<big_endian>(p + 4, lwz_11_11 + l(off));
+ write_insn<big_endian>(p + 8, mtctr_11);
+ write_insn<big_endian>(p + 12, bctr);
+ }
+ }
+ else
+ {
+ write_insn<big_endian>(p + 0, lis_11 + ha(plt_addr));
+ write_insn<big_endian>(p + 4, lwz_11_11 + l(plt_addr));
+ write_insn<big_endian>(p + 8, mtctr_11);
+ write_insn<big_endian>(p + 12, bctr);
+ }
+ }
+ }
+
+ // Write out long branch stubs.
+ typename Branch_stub_entries::const_iterator bs;
+ for (bs = this->long_branch_stubs_.begin();
+ bs != this->long_branch_stubs_.end();
+ ++bs)
+ {
+ p = oview + this->plt_size_ + bs->second;
+ Address loc = this->stub_address() + this->plt_size_ + bs->second;
+ Address delta = bs->first.dest_ - loc;
+ if (delta + (1 << 25) < 2 << 25)
+ write_insn<big_endian>(p, b | (delta & 0x3fffffc));
+ else if (!parameters->options().output_is_position_independent())
+ {
+ write_insn<big_endian>(p + 0, lis_12 + ha(bs->first.dest_));
+ write_insn<big_endian>(p + 4, addi_12_12 + l(bs->first.dest_));
+ write_insn<big_endian>(p + 8, mtctr_12);
+ write_insn<big_endian>(p + 12, bctr);
+ }
+ else
+ {
+ delta -= 8;
+ write_insn<big_endian>(p + 0, mflr_0);
+ write_insn<big_endian>(p + 4, bcl_20_31);
+ write_insn<big_endian>(p + 8, mflr_12);
+ write_insn<big_endian>(p + 12, addis_12_12 + ha(delta));
+ write_insn<big_endian>(p + 16, addi_12_12 + l(delta));
+ write_insn<big_endian>(p + 20, mtlr_0);
+ write_insn<big_endian>(p + 24, mtctr_12);
+ write_insn<big_endian>(p + 28, bctr);
+ }
+ }
+ }
+}
+
+// Write out .glink.
+
+template<int size, bool big_endian>
+void
+Output_data_glink<size, big_endian>::do_write(Output_file* of)
+{
+ const section_size_type off = this->offset();
+ const section_size_type oview_size =
+ convert_to_section_size_type(this->data_size());
+ unsigned char* const oview = of->get_output_view(off, oview_size);
+ unsigned char* p;
+
+ // The base address of the .plt section.
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+ Address plt_base = this->targ_->plt_section()->address();
+
+ if (size == 64)
+ {
// Write pltresolve stub.
- p = oview + this->pltresolve_;
- Address after_bcl = this->address() + this->pltresolve_ + 16;
+ p = oview;
+ Address after_bcl = this->address() + 16;
Address pltoff = plt_base - after_bcl;
elfcpp::Swap<64, big_endian>::writeval(p, pltoff), p += 8;
write_insn<big_endian>(p, mtctr_11), p += 4;
write_insn<big_endian>(p, ld_11_12 + 16), p += 4;
write_insn<big_endian>(p, bctr), p += 4;
- while (p < oview + this->pltresolve_ + this->pltresolve_size)
+ while (p < oview + this->pltresolve_size)
write_insn<big_endian>(p, nop), p += 4;
// Write lazy link call stubs.
write_insn<big_endian>(p, lis_0_0 + hi(indx)), p += 4;
write_insn<big_endian>(p, ori_0_0_0 + l(indx)), p += 4;
}
- uint32_t branch_off = this->pltresolve_ + 8 - (p - oview);
+ uint32_t branch_off = 8 - (p - oview);
write_insn<big_endian>(p, b + (branch_off & 0x3fffffc)), p += 4;
indx++;
}
}
else
{
+ const Output_data_got_powerpc<size, big_endian>* got
+ = this->targ_->got_section();
// The address of _GLOBAL_OFFSET_TABLE_.
Address g_o_t = got->address() + got->g_o_t();
- // Write out call stubs.
- typename Glink_entries::const_iterator g;
- for (g = this->glink_entries_.begin();
- g != this->glink_entries_.end();
- ++g)
- {
- Address plt_addr = plt_base + g->first.sym_->plt_offset();
- Address got_addr;
- const Address invalid_address = static_cast<Address>(-1);
-
- p = oview + g->second * this->glink_entry_size();
- if (parameters->options().output_is_position_independent())
- {
- const Powerpc_relobj<size, big_endian>* object = static_cast
- <const Powerpc_relobj<size, big_endian>*>(g->first.object_);
- if (object != NULL)
- {
- unsigned int got2 = object->got2_shndx();
- got_addr = g->first.object_->get_output_section_offset(got2);
- gold_assert(got_addr != invalid_address);
- got_addr += (g->first.object_->output_section(got2)->address()
- + g->first.addend_);
- }
- else
- got_addr = g_o_t;
-
- Address pltoff = plt_addr - got_addr;
- if (ha(pltoff) == 0)
- {
- write_insn<big_endian>(p + 0, lwz_11_30 + l(pltoff));
- write_insn<big_endian>(p + 4, mtctr_11);
- write_insn<big_endian>(p + 8, bctr);
- }
- else
- {
- write_insn<big_endian>(p + 0, addis_11_30 + ha(pltoff));
- write_insn<big_endian>(p + 4, lwz_11_11 + l(pltoff));
- write_insn<big_endian>(p + 8, mtctr_11);
- write_insn<big_endian>(p + 12, bctr);
- }
- }
- else
- {
- write_insn<big_endian>(p + 0, lis_11 + ha(plt_addr));
- write_insn<big_endian>(p + 4, lwz_11_11 + l(plt_addr));
- write_insn<big_endian>(p + 8, mtctr_11);
- write_insn<big_endian>(p + 12, bctr);
- }
- }
-
// Write out pltresolve branch table.
- p = oview + this->pltresolve_;
+ p = oview;
unsigned int the_end = oview_size - this->pltresolve_size;
unsigned char* end_p = oview + the_end;
while (p < end_p - 8 * 4)
// Write out pltresolve call stub.
if (parameters->options().output_is_position_independent())
{
- Address res0_off = this->pltresolve_;
+ Address res0_off = 0;
Address after_bcl_off = the_end + 12;
Address bcl_res0 = after_bcl_off - res0_off;
}
else
{
- Address res0 = this->pltresolve_ + this->address();
+ Address res0 = this->address();
write_insn<big_endian>(p + 0, lis_12 + ha(g_o_t + 4));
write_insn<big_endian>(p + 4, addis_11_11 + ha(-res0));
if (ha(g_o_t + 4) == ha(g_o_t + 8))
write_insn<big_endian>(p + 24, lwz_12_12 + l(g_o_t + 8));
else
- write_insn<big_endian>(p + 24, lwz_12_12 + 4);
- write_insn<big_endian>(p + 28, add_11_0_11);
- write_insn<big_endian>(p + 32, bctr);
- write_insn<big_endian>(p + 36, nop);
- write_insn<big_endian>(p + 40, nop);
- write_insn<big_endian>(p + 44, nop);
- write_insn<big_endian>(p + 48, nop);
- write_insn<big_endian>(p + 52, nop);
- write_insn<big_endian>(p + 56, nop);
- write_insn<big_endian>(p + 60, nop);
+ write_insn<big_endian>(p + 24, lwz_12_12 + 4);
+ write_insn<big_endian>(p + 28, add_11_0_11);
+ write_insn<big_endian>(p + 32, bctr);
+ write_insn<big_endian>(p + 36, nop);
+ write_insn<big_endian>(p + 40, nop);
+ write_insn<big_endian>(p + 44, nop);
+ write_insn<big_endian>(p + 48, nop);
+ write_insn<big_endian>(p + 52, nop);
+ write_insn<big_endian>(p + 56, nop);
+ write_insn<big_endian>(p + 60, nop);
+ }
+ p += 64;
+ }
+
+ of->write_output_view(off, oview_size, oview);
+}
+
+
+// A class to handle linker generated save/restore functions.
+
+template<int size, bool big_endian>
+class Output_data_save_res : public Output_section_data_build
+{
+ public:
+ Output_data_save_res(Symbol_table* symtab);
+
+ protected:
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** save/restore")); }
+
+ void
+ do_write(Output_file*);
+
+ private:
+ // The maximum size of save/restore contents.
+ static const unsigned int savres_max = 218*4;
+
+ void
+ savres_define(Symbol_table* symtab,
+ const char *name,
+ unsigned int lo, unsigned int hi,
+ unsigned char* write_ent(unsigned char*, int),
+ unsigned char* write_tail(unsigned char*, int));
+
+ unsigned char *contents_;
+};
+
+template<bool big_endian>
+static unsigned char*
+savegpr0(unsigned char* p, int r)
+{
+ uint32_t insn = std_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savegpr0_tail(unsigned char* p, int r)
+{
+ p = savegpr0<big_endian>(p, r);
+ uint32_t insn = std_0_1 + 16;
+ write_insn<big_endian>(p, insn);
+ p = p + 4;
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restgpr0(unsigned char* p, int r)
+{
+ uint32_t insn = ld_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restgpr0_tail(unsigned char* p, int r)
+{
+ uint32_t insn = ld_0_1 + 16;
+ write_insn<big_endian>(p, insn);
+ p = p + 4;
+ p = restgpr0<big_endian>(p, r);
+ write_insn<big_endian>(p, mtlr_0);
+ p = p + 4;
+ if (r == 29)
+ {
+ p = restgpr0<big_endian>(p, 30);
+ p = restgpr0<big_endian>(p, 31);
+ }
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savegpr1(unsigned char* p, int r)
+{
+ uint32_t insn = std_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8;
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savegpr1_tail(unsigned char* p, int r)
+{
+ p = savegpr1<big_endian>(p, r);
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restgpr1(unsigned char* p, int r)
+{
+ uint32_t insn = ld_0_12 + (r << 21) + (1 << 16) - (32 - r) * 8;
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restgpr1_tail(unsigned char* p, int r)
+{
+ p = restgpr1<big_endian>(p, r);
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savefpr(unsigned char* p, int r)
+{
+ uint32_t insn = stfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savefpr0_tail(unsigned char* p, int r)
+{
+ p = savefpr<big_endian>(p, r);
+ write_insn<big_endian>(p, std_0_1 + 16);
+ p = p + 4;
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restfpr(unsigned char* p, int r)
+{
+ uint32_t insn = lfd_0_1 + (r << 21) + (1 << 16) - (32 - r) * 8;
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restfpr0_tail(unsigned char* p, int r)
+{
+ write_insn<big_endian>(p, ld_0_1 + 16);
+ p = p + 4;
+ p = restfpr<big_endian>(p, r);
+ write_insn<big_endian>(p, mtlr_0);
+ p = p + 4;
+ if (r == 29)
+ {
+ p = restfpr<big_endian>(p, 30);
+ p = restfpr<big_endian>(p, 31);
+ }
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savefpr1_tail(unsigned char* p, int r)
+{
+ p = savefpr<big_endian>(p, r);
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restfpr1_tail(unsigned char* p, int r)
+{
+ p = restfpr<big_endian>(p, r);
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savevr(unsigned char* p, int r)
+{
+ uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16;
+ write_insn<big_endian>(p, insn);
+ p = p + 4;
+ insn = stvx_0_12_0 + (r << 21);
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+savevr_tail(unsigned char* p, int r)
+{
+ p = savevr<big_endian>(p, r);
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restvr(unsigned char* p, int r)
+{
+ uint32_t insn = li_12_0 + (1 << 16) - (32 - r) * 16;
+ write_insn<big_endian>(p, insn);
+ p = p + 4;
+ insn = lvx_0_12_0 + (r << 21);
+ write_insn<big_endian>(p, insn);
+ return p + 4;
+}
+
+template<bool big_endian>
+static unsigned char*
+restvr_tail(unsigned char* p, int r)
+{
+ p = restvr<big_endian>(p, r);
+ write_insn<big_endian>(p, blr);
+ return p + 4;
+}
+
+
+template<int size, bool big_endian>
+Output_data_save_res<size, big_endian>::Output_data_save_res(
+ Symbol_table* symtab)
+ : Output_section_data_build(4),
+ contents_(NULL)
+{
+ this->savres_define(symtab,
+ "_savegpr0_", 14, 31,
+ savegpr0<big_endian>, savegpr0_tail<big_endian>);
+ this->savres_define(symtab,
+ "_restgpr0_", 14, 29,
+ restgpr0<big_endian>, restgpr0_tail<big_endian>);
+ this->savres_define(symtab,
+ "_restgpr0_", 30, 31,
+ restgpr0<big_endian>, restgpr0_tail<big_endian>);
+ this->savres_define(symtab,
+ "_savegpr1_", 14, 31,
+ savegpr1<big_endian>, savegpr1_tail<big_endian>);
+ this->savres_define(symtab,
+ "_restgpr1_", 14, 31,
+ restgpr1<big_endian>, restgpr1_tail<big_endian>);
+ this->savres_define(symtab,
+ "_savefpr_", 14, 31,
+ savefpr<big_endian>, savefpr0_tail<big_endian>);
+ this->savres_define(symtab,
+ "_restfpr_", 14, 29,
+ restfpr<big_endian>, restfpr0_tail<big_endian>);
+ this->savres_define(symtab,
+ "_restfpr_", 30, 31,
+ restfpr<big_endian>, restfpr0_tail<big_endian>);
+ this->savres_define(symtab,
+ "._savef", 14, 31,
+ savefpr<big_endian>, savefpr1_tail<big_endian>);
+ this->savres_define(symtab,
+ "._restf", 14, 31,
+ restfpr<big_endian>, restfpr1_tail<big_endian>);
+ this->savres_define(symtab,
+ "_savevr_", 20, 31,
+ savevr<big_endian>, savevr_tail<big_endian>);
+ this->savres_define(symtab,
+ "_restvr_", 20, 31,
+ restvr<big_endian>, restvr_tail<big_endian>);
+}
+
+template<int size, bool big_endian>
+void
+Output_data_save_res<size, big_endian>::savres_define(
+ Symbol_table* symtab,
+ const char *name,
+ unsigned int lo, unsigned int hi,
+ unsigned char* write_ent(unsigned char*, int),
+ unsigned char* write_tail(unsigned char*, int))
+{
+ size_t len = strlen(name);
+ bool writing = false;
+ char sym[16];
+
+ memcpy(sym, name, len);
+ sym[len + 2] = 0;
+
+ for (unsigned int i = lo; i <= hi; i++)
+ {
+ sym[len + 0] = i / 10 + '0';
+ sym[len + 1] = i % 10 + '0';
+ Symbol* gsym = symtab->lookup(sym);
+ bool refd = gsym != NULL && gsym->is_undefined();
+ writing = writing || refd;
+ if (writing)
+ {
+ if (this->contents_ == NULL)
+ this->contents_ = new unsigned char[this->savres_max];
+
+ section_size_type value = this->current_data_size();
+ unsigned char* p = this->contents_ + value;
+ if (i != hi)
+ p = write_ent(p, i);
+ else
+ p = write_tail(p, i);
+ section_size_type cur_size = p - this->contents_;
+ this->set_current_data_size(cur_size);
+ if (refd)
+ symtab->define_in_output_data(sym, NULL, Symbol_table::PREDEFINED,
+ this, value, cur_size - value,
+ elfcpp::STT_FUNC, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, false, false);
}
- p += 64;
}
+}
+// Write out save/restore.
+
+template<int size, bool big_endian>
+void
+Output_data_save_res<size, big_endian>::do_write(Output_file* of)
+{
+ const section_size_type off = this->offset();
+ const section_size_type oview_size =
+ convert_to_section_size_type(this->data_size());
+ unsigned char* const oview = of->get_output_view(off, oview_size);
+ memcpy(oview, this->contents_, oview_size);
of->write_output_view(off, oview_size, oview);
}
+
// Create the glink section.
template<int size, bool big_endian>
template<int size, bool big_endian>
void
-Target_powerpc<size, big_endian>::make_plt_entry(
- Layout* layout,
- Symbol* gsym,
- const elfcpp::Rela<size, big_endian>& reloc,
- const Sized_relobj<size, big_endian>* object)
+Target_powerpc<size, big_endian>::make_plt_entry(Symbol_table* symtab,
+ Layout* layout,
+ Symbol* gsym)
{
- if (this->plt_ == NULL)
- this->make_plt_section(layout);
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && gsym->can_use_relative_reloc(false))
+ {
+ if (this->iplt_ == NULL)
+ this->make_iplt_section(symtab, layout);
+ this->iplt_->add_ifunc_entry(gsym);
+ }
+ else
+ {
+ if (this->plt_ == NULL)
+ this->make_plt_section(symtab, layout);
+ this->plt_->add_entry(gsym);
+ }
+}
- this->plt_->add_entry(gsym);
+// Make a PLT entry for a local STT_GNU_IFUNC symbol.
- this->glink_->add_entry(gsym, reloc, object);
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::make_local_ifunc_plt_entry(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, big_endian>* relobj,
+ unsigned int r_sym)
+{
+ if (this->iplt_ == NULL)
+ this->make_iplt_section(symtab, layout);
+ this->iplt_->add_local_ifunc_entry(relobj, r_sym);
}
// Return the number of entries in the PLT.
{
if (this->plt_ == NULL)
return 0;
- return this->plt_->entry_count();
+ unsigned int count = this->plt_->entry_count();
+ if (this->iplt_ != NULL)
+ count += this->iplt_->entry_count();
+ return count;
}
// Return the offset of the first non-reserved PLT entry.
unsigned int
Target_powerpc<size, big_endian>::first_plt_entry_offset() const
{
- return Output_data_plt_powerpc<size, big_endian>::first_plt_entry_offset();
+ return this->plt_->first_plt_entry_offset();
}
// Return the size of each PLT entry.
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
return Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF;
+ case elfcpp::R_PPC64_REL64:
case elfcpp::R_POWERPC_REL32:
case elfcpp::R_PPC_LOCAL24PC:
case elfcpp::R_POWERPC_REL16:
case elfcpp::R_POWERPC_GOT16_LO:
case elfcpp::R_POWERPC_GOT16_HI:
case elfcpp::R_POWERPC_GOT16_HA:
+ case elfcpp::R_PPC64_GOT16_DS:
+ case elfcpp::R_PPC64_GOT16_LO_DS:
case elfcpp::R_PPC64_TOC16:
case elfcpp::R_PPC64_TOC16_LO:
case elfcpp::R_PPC64_TOC16_HI:
// and 64-bit powerpc.
switch (r_type)
{
+ case elfcpp::R_POWERPC_NONE:
case elfcpp::R_POWERPC_RELATIVE:
case elfcpp::R_POWERPC_GLOB_DAT:
case elfcpp::R_POWERPC_DTPMOD:
case elfcpp::R_POWERPC_TPREL:
case elfcpp::R_POWERPC_JMP_SLOT:
case elfcpp::R_POWERPC_COPY:
+ case elfcpp::R_POWERPC_IRELATIVE:
case elfcpp::R_POWERPC_ADDR32:
+ case elfcpp::R_POWERPC_UADDR32:
case elfcpp::R_POWERPC_ADDR24:
+ case elfcpp::R_POWERPC_ADDR16:
+ case elfcpp::R_POWERPC_UADDR16:
+ case elfcpp::R_POWERPC_ADDR16_LO:
+ case elfcpp::R_POWERPC_ADDR16_HI:
+ case elfcpp::R_POWERPC_ADDR16_HA:
+ case elfcpp::R_POWERPC_ADDR14:
+ case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
+ case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
+ case elfcpp::R_POWERPC_REL32:
case elfcpp::R_POWERPC_REL24:
+ case elfcpp::R_POWERPC_TPREL16:
+ case elfcpp::R_POWERPC_TPREL16_LO:
+ case elfcpp::R_POWERPC_TPREL16_HI:
+ case elfcpp::R_POWERPC_TPREL16_HA:
return;
default:
{
// These are the relocation types supported only on 64-bit.
case elfcpp::R_PPC64_ADDR64:
- case elfcpp::R_PPC64_TPREL16_LO_DS:
- case elfcpp::R_PPC64_TPREL16_DS:
- case elfcpp::R_POWERPC_TPREL16:
- case elfcpp::R_POWERPC_TPREL16_LO:
- case elfcpp::R_POWERPC_TPREL16_HI:
- case elfcpp::R_POWERPC_TPREL16_HA:
- case elfcpp::R_PPC64_TPREL16_HIGHER:
- case elfcpp::R_PPC64_TPREL16_HIGHEST:
- case elfcpp::R_PPC64_TPREL16_HIGHERA:
- case elfcpp::R_PPC64_TPREL16_HIGHESTA:
- case elfcpp::R_PPC64_ADDR16_LO_DS:
- case elfcpp::R_POWERPC_ADDR16_LO:
- case elfcpp::R_POWERPC_ADDR16_HI:
- case elfcpp::R_POWERPC_ADDR16_HA:
- case elfcpp::R_POWERPC_ADDR30:
case elfcpp::R_PPC64_UADDR64:
- case elfcpp::R_POWERPC_UADDR32:
- case elfcpp::R_POWERPC_ADDR16:
- case elfcpp::R_POWERPC_UADDR16:
+ case elfcpp::R_PPC64_JMP_IREL:
case elfcpp::R_PPC64_ADDR16_DS:
+ case elfcpp::R_PPC64_ADDR16_LO_DS:
case elfcpp::R_PPC64_ADDR16_HIGHER:
case elfcpp::R_PPC64_ADDR16_HIGHEST:
case elfcpp::R_PPC64_ADDR16_HIGHERA:
case elfcpp::R_PPC64_ADDR16_HIGHESTA:
- case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
- case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
- case elfcpp::R_POWERPC_REL32:
case elfcpp::R_PPC64_REL64:
+ case elfcpp::R_POWERPC_ADDR30:
+ case elfcpp::R_PPC64_TPREL16_DS:
+ case elfcpp::R_PPC64_TPREL16_LO_DS:
+ case elfcpp::R_PPC64_TPREL16_HIGHER:
+ case elfcpp::R_PPC64_TPREL16_HIGHEST:
+ case elfcpp::R_PPC64_TPREL16_HIGHERA:
+ case elfcpp::R_PPC64_TPREL16_HIGHESTA:
return;
default:
switch (r_type)
{
// These are the relocation types supported only on 32-bit.
+ // ??? glibc ld.so doesn't need to support these.
+ case elfcpp::R_POWERPC_DTPREL16:
+ case elfcpp::R_POWERPC_DTPREL16_LO:
+ case elfcpp::R_POWERPC_DTPREL16_HI:
+ case elfcpp::R_POWERPC_DTPREL16_HA:
+ return;
default:
break;
return;
}
+// Return whether we need to make a PLT entry for a relocation of the
+// given type against a STT_GNU_IFUNC symbol.
+
+template<int size, bool big_endian>
+bool
+Target_powerpc<size, big_endian>::Scan::reloc_needs_plt_for_ifunc(
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int r_type)
+{
+ // In non-pic code any reference will resolve to the plt call stub
+ // for the ifunc symbol.
+ if (size == 32 && !parameters->options().output_is_position_independent())
+ return true;
+
+ switch (r_type)
+ {
+ // Word size refs from data sections are OK.
+ case elfcpp::R_POWERPC_ADDR32:
+ case elfcpp::R_POWERPC_UADDR32:
+ if (size == 32)
+ return true;
+ break;
+
+ case elfcpp::R_PPC64_ADDR64:
+ case elfcpp::R_PPC64_UADDR64:
+ if (size == 64)
+ return true;
+ break;
+
+ // GOT refs are good.
+ case elfcpp::R_POWERPC_GOT16:
+ case elfcpp::R_POWERPC_GOT16_LO:
+ case elfcpp::R_POWERPC_GOT16_HI:
+ case elfcpp::R_POWERPC_GOT16_HA:
+ case elfcpp::R_PPC64_GOT16_DS:
+ case elfcpp::R_PPC64_GOT16_LO_DS:
+ return true;
+
+ // So are function calls.
+ case elfcpp::R_POWERPC_ADDR24:
+ case elfcpp::R_POWERPC_ADDR14:
+ case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
+ case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
+ case elfcpp::R_POWERPC_REL24:
+ case elfcpp::R_PPC_PLTREL24:
+ case elfcpp::R_POWERPC_REL14:
+ case elfcpp::R_POWERPC_REL14_BRTAKEN:
+ case elfcpp::R_POWERPC_REL14_BRNTAKEN:
+ return true;
+
+ default:
+ break;
+ }
+
+ // Anything else is a problem.
+ // If we are building a static executable, the libc startup function
+ // responsible for applying indirect function relocations is going
+ // to complain about the reloc type.
+ // If we are building a dynamic executable, we will have a text
+ // relocation. The dynamic loader will set the text segment
+ // writable and non-executable to apply text relocations. So we'll
+ // segfault when trying to run the indirection function to resolve
+ // the reloc.
+ gold_error(_("%s: unsupported reloc %u for IFUNC symbol"),
+ object->name().c_str(), r_type);
+ return false;
+}
+
// Scan a relocation for a local symbol.
template<int size, bool big_endian>
Output_section* output_section,
const elfcpp::Rela<size, big_endian>& reloc,
unsigned int r_type,
- const elfcpp::Sym<size, big_endian>& lsym)
+ const elfcpp::Sym<size, big_endian>& lsym,
+ bool is_discarded)
{
Powerpc_relobj<size, big_endian>* ppc_object
= static_cast<Powerpc_relobj<size, big_endian>*>(object);
+ if (is_discarded)
+ {
+ if (size == 64
+ && data_shndx == ppc_object->opd_shndx()
+ && r_type == elfcpp::R_PPC64_ADDR64)
+ ppc_object->set_opd_discard(reloc.get_r_offset());
+ return;
+ }
+
+ // A local STT_GNU_IFUNC symbol may require a PLT entry.
+ bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
+ if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
+ {
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
+ target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
+ r_type, r_sym, reloc.get_r_addend());
+ target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
+ }
+
switch (r_type)
{
case elfcpp::R_POWERPC_NONE:
= target->got_section(symtab, layout);
if (parameters->options().output_is_position_independent())
{
+ Address off = reloc.get_r_offset();
+ if (size == 64
+ && data_shndx == ppc_object->opd_shndx()
+ && ppc_object->get_opd_discard(off - 8))
+ break;
+
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ Powerpc_relobj<size, big_endian>* symobj = ppc_object;
rela_dyn->add_output_section_relative(got->output_section(),
elfcpp::R_POWERPC_RELATIVE,
output_section,
- object, data_shndx,
- reloc.get_r_offset(),
- ppc_object->toc_base_offset());
+ object, data_shndx, off,
+ symobj->toc_base_offset());
}
}
break;
// If building a shared library (or a position-independent
// executable), we need to create a dynamic relocation for
// this location.
- if (parameters->options().output_is_position_independent())
+ if (parameters->options().output_is_position_independent()
+ || (size == 64 && is_ifunc))
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
|| (size == 64 && r_type == elfcpp::R_PPC64_ADDR64))
{
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
- rela_dyn->add_local_relative(object, r_sym,
- elfcpp::R_POWERPC_RELATIVE,
+ unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE;
+ if (is_ifunc)
+ {
+ rela_dyn = target->iplt_section()->rel_plt();
+ dynrel = elfcpp::R_POWERPC_IRELATIVE;
+ }
+ rela_dyn->add_local_relative(object, r_sym, dynrel,
output_section, data_shndx,
reloc.get_r_offset(),
reloc.get_r_addend(), false);
}
break;
- case elfcpp::R_POWERPC_REL32:
case elfcpp::R_POWERPC_REL24:
+ case elfcpp::R_PPC_PLTREL24:
case elfcpp::R_PPC_LOCAL24PC:
+ target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
+ r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
+ reloc.get_r_addend());
+ break;
+
+ case elfcpp::R_POWERPC_REL14:
+ case elfcpp::R_POWERPC_REL14_BRTAKEN:
+ case elfcpp::R_POWERPC_REL14_BRNTAKEN:
+ target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
+ r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
+ reloc.get_r_addend());
+ break;
+
+ case elfcpp::R_PPC64_REL64:
+ case elfcpp::R_POWERPC_REL32:
case elfcpp::R_POWERPC_REL16:
case elfcpp::R_POWERPC_REL16_LO:
case elfcpp::R_POWERPC_REL16_HI:
case elfcpp::R_POWERPC_REL16_HA:
- case elfcpp::R_POWERPC_REL14:
- case elfcpp::R_POWERPC_REL14_BRTAKEN:
- case elfcpp::R_POWERPC_REL14_BRNTAKEN:
case elfcpp::R_POWERPC_SECTOFF:
case elfcpp::R_POWERPC_TPREL16:
case elfcpp::R_POWERPC_DTPREL16:
= target->got_section(symtab, layout);
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
- // If we are generating a shared object, we need to add a
- // dynamic relocation for this symbol's GOT entry.
- if (parameters->options().output_is_position_independent())
+ if (!parameters->options().output_is_position_independent())
{
- if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
- {
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- unsigned int off;
+ if (size == 32 && is_ifunc)
+ got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
+ else
+ got->add_local(object, r_sym, GOT_TYPE_STANDARD);
+ }
+ else if (!object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD))
+ {
+ // If we are generating a shared object or a pie, this
+ // symbol's GOT entry will be set by a dynamic relocation.
+ unsigned int off;
+ off = got->add_constant(0);
+ object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
- off = got->add_constant(0);
- object->set_local_got_offset(r_sym, GOT_TYPE_STANDARD, off);
- rela_dyn->add_local_relative(object, r_sym,
- elfcpp::R_POWERPC_RELATIVE,
- got, off, 0, false);
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE;
+ if (is_ifunc)
+ {
+ rela_dyn = target->iplt_section()->rel_plt();
+ dynrel = elfcpp::R_POWERPC_IRELATIVE;
}
+ rela_dyn->add_local_relative(object, r_sym, dynrel,
+ got, off, 0, false);
}
- else
- got->add_local(object, r_sym, GOT_TYPE_STANDARD);
}
break;
Output_data_got_powerpc<size, big_endian>* got
= target->got_section(symtab, layout);
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
- unsigned int shndx = lsym.get_st_shndx();
- bool is_ordinary;
- shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
- gold_assert(is_ordinary);
- got->add_local_pair_with_rel(object, r_sym,
- shndx,
- GOT_TYPE_TLSGD,
- target->rela_dyn_section(layout),
- elfcpp::R_POWERPC_DTPMOD,
- elfcpp::R_POWERPC_DTPREL);
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ got->add_local_tls_pair(object, r_sym, GOT_TYPE_TLSGD,
+ rela_dyn, elfcpp::R_POWERPC_DTPMOD);
}
else if (tls_type == tls::TLSOPT_TO_LE)
{
Output_data_got_powerpc<size, big_endian>* got
= target->got_section(symtab, layout);
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
- got->add_local_with_rel(object, r_sym, GOT_TYPE_DTPREL,
- target->rela_dyn_section(layout),
- elfcpp::R_POWERPC_DTPREL);
+ got->add_local_tls(object, r_sym, GOT_TYPE_DTPREL);
}
break;
const tls::Tls_optimization tls_type = target->optimize_tls_ie(true);
if (tls_type == tls::TLSOPT_NONE)
{
- Output_data_got_powerpc<size, big_endian>* got
- = target->got_section(symtab, layout);
unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
- got->add_local_with_rel(object, r_sym, GOT_TYPE_TPREL,
- target->rela_dyn_section(layout),
- elfcpp::R_POWERPC_TPREL);
+ if (!object->local_has_got_offset(r_sym, GOT_TYPE_TPREL))
+ {
+ Output_data_got_powerpc<size, big_endian>* got
+ = target->got_section(symtab, layout);
+ unsigned int off = got->add_constant(0);
+ object->set_local_got_offset(r_sym, GOT_TYPE_TPREL, off);
+
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ rela_dyn->add_symbolless_local_addend(object, r_sym,
+ elfcpp::R_POWERPC_TPREL,
+ got, off, 0);
+ }
}
else if (tls_type == tls::TLSOPT_TO_LE)
{
unsupported_reloc_local(object, r_type);
break;
}
+
+ switch (r_type)
+ {
+ case elfcpp::R_POWERPC_GOT_TLSLD16:
+ case elfcpp::R_POWERPC_GOT_TLSGD16:
+ case elfcpp::R_POWERPC_GOT_TPREL16:
+ case elfcpp::R_POWERPC_GOT_DTPREL16:
+ case elfcpp::R_POWERPC_GOT16:
+ case elfcpp::R_PPC64_GOT16_DS:
+ case elfcpp::R_PPC64_TOC16:
+ case elfcpp::R_PPC64_TOC16_DS:
+ ppc_object->set_has_small_toc_reloc();
+ default:
+ break;
+ }
}
// Report an unsupported relocation against a global symbol.
Powerpc_relobj<size, big_endian>* ppc_object
= static_cast<Powerpc_relobj<size, big_endian>*>(object);
+ // A STT_GNU_IFUNC symbol may require a PLT entry.
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC
+ && this->reloc_needs_plt_for_ifunc(object, r_type))
+ {
+ target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
+ r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
+ reloc.get_r_addend());
+ target->make_plt_entry(symtab, layout, gsym);
+ }
+
switch (r_type)
{
case elfcpp::R_POWERPC_NONE:
= target->got_section(symtab, layout);
if (parameters->options().output_is_position_independent())
{
+ Address off = reloc.get_r_offset();
+ if (size == 64
+ && data_shndx == ppc_object->opd_shndx()
+ && ppc_object->get_opd_discard(off - 8))
+ break;
+
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
Powerpc_relobj<size, big_endian>* symobj = ppc_object;
if (data_shndx != ppc_object->opd_shndx())
rela_dyn->add_output_section_relative(got->output_section(),
elfcpp::R_POWERPC_RELATIVE,
output_section,
- object, data_shndx,
- reloc.get_r_offset(),
+ object, data_shndx, off,
symobj->toc_base_offset());
}
}
break;
case elfcpp::R_PPC64_ADDR64:
+ if (size == 64
+ && data_shndx == ppc_object->opd_shndx()
+ && (gsym->is_defined_in_discarded_section()
+ || gsym->object() != object))
+ {
+ ppc_object->set_opd_discard(reloc.get_r_offset());
+ break;
+ }
+ // Fall thru
case elfcpp::R_PPC64_UADDR64:
case elfcpp::R_POWERPC_ADDR32:
case elfcpp::R_POWERPC_UADDR32:
// Make a PLT entry if necessary.
if (gsym->needs_plt_entry())
{
- target->make_plt_entry(layout, gsym, reloc, 0);
+ target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
+ r_type,
+ elfcpp::elf_r_sym<size>(reloc.get_r_info()),
+ reloc.get_r_addend());
+ target->make_plt_entry(symtab, layout, gsym);
// Since this is not a PC-relative relocation, we may be
// taking the address of a function. In that case we need to
// set the entry in the dynamic symbol table to the address of
- // the PLT entry.
+ // the PLT call stub.
if (size == 32
- && gsym->is_from_dynobj() && !parameters->options().shared())
+ && gsym->is_from_dynobj()
+ && !parameters->options().output_is_position_independent())
gsym->set_needs_dynsym_value();
}
// Make a dynamic relocation if necessary.
- if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type)))
+ if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type))
+ || (size == 64 && gsym->type() == elfcpp::STT_GNU_IFUNC))
{
if (gsym->may_need_copy_reloc())
{
target->copy_reloc(symtab, layout, object,
data_shndx, output_section, gsym, reloc);
}
- else if (((size == 32 && r_type == elfcpp::R_POWERPC_ADDR32)
- || (size == 64 && r_type == elfcpp::R_PPC64_ADDR64))
- && (gsym->can_use_relative_reloc(false)
- || data_shndx == ppc_object->opd_shndx()))
+ else if ((size == 32
+ && r_type == elfcpp::R_POWERPC_ADDR32
+ && gsym->can_use_relative_reloc(false)
+ && !(gsym->visibility() == elfcpp::STV_PROTECTED
+ && parameters->options().shared()))
+ || (size == 64
+ && r_type == elfcpp::R_PPC64_ADDR64
+ && (gsym->can_use_relative_reloc(false)
+ || data_shndx == ppc_object->opd_shndx())))
{
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
- output_section, object,
- data_shndx, reloc.get_r_offset(),
- reloc.get_r_addend(), false);
+ unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE;
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC)
+ {
+ rela_dyn = target->iplt_section()->rel_plt();
+ dynrel = elfcpp::R_POWERPC_IRELATIVE;
+ }
+ rela_dyn->add_symbolless_global_addend(
+ gsym, dynrel, output_section, object, data_shndx,
+ reloc.get_r_offset(), reloc.get_r_addend());
}
else
{
case elfcpp::R_PPC_PLTREL24:
case elfcpp::R_POWERPC_REL24:
- {
- if (gsym->needs_plt_entry()
- || (!gsym->final_value_is_known()
- && !(gsym->is_defined()
- && !gsym->is_from_dynobj()
- && !gsym->is_preemptible())))
- target->make_plt_entry(layout, gsym, reloc, object);
- // Make a dynamic relocation if necessary.
- if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type)))
- {
- if (gsym->may_need_copy_reloc())
- {
- target->copy_reloc(symtab, layout, object,
- data_shndx, output_section, gsym,
- reloc);
- }
- else
- {
- Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- check_non_pic(object, r_type);
- rela_dyn->add_global(gsym, r_type, output_section, object,
- data_shndx, reloc.get_r_offset(),
- reloc.get_r_addend());
- }
- }
- }
- break;
+ target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
+ r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
+ reloc.get_r_addend());
+ if (gsym->needs_plt_entry()
+ || (!gsym->final_value_is_known()
+ && (gsym->is_undefined()
+ || gsym->is_from_dynobj()
+ || gsym->is_preemptible())))
+ target->make_plt_entry(symtab, layout, gsym);
+ // Fall thru
+ case elfcpp::R_PPC64_REL64:
case elfcpp::R_POWERPC_REL32:
+ // Make a dynamic relocation if necessary.
+ if (needs_dynamic_reloc<size>(gsym, Scan::get_reference_flags(r_type)))
+ {
+ if (gsym->may_need_copy_reloc())
+ {
+ target->copy_reloc(symtab, layout, object,
+ data_shndx, output_section, gsym,
+ reloc);
+ }
+ else
+ {
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ check_non_pic(object, r_type);
+ rela_dyn->add_global(gsym, r_type, output_section, object,
+ data_shndx, reloc.get_r_offset(),
+ reloc.get_r_addend());
+ }
+ }
+ break;
+
+ case elfcpp::R_POWERPC_REL14:
+ case elfcpp::R_POWERPC_REL14_BRTAKEN:
+ case elfcpp::R_POWERPC_REL14_BRNTAKEN:
+ target->push_branch(ppc_object, data_shndx, reloc.get_r_offset(),
+ r_type, elfcpp::elf_r_sym<size>(reloc.get_r_info()),
+ reloc.get_r_addend());
+ break;
+
case elfcpp::R_POWERPC_REL16:
case elfcpp::R_POWERPC_REL16_LO:
case elfcpp::R_POWERPC_REL16_HI:
case elfcpp::R_POWERPC_REL16_HA:
- case elfcpp::R_POWERPC_REL14:
- case elfcpp::R_POWERPC_REL14_BRTAKEN:
- case elfcpp::R_POWERPC_REL14_BRNTAKEN:
case elfcpp::R_POWERPC_SECTOFF:
case elfcpp::R_POWERPC_TPREL16:
case elfcpp::R_POWERPC_DTPREL16:
got = target->got_section(symtab, layout);
if (gsym->final_value_is_known())
- got->add_global(gsym, GOT_TYPE_STANDARD);
- else
{
- // If this symbol is not fully resolved, we need to add a
- // dynamic relocation for it.
+ if (size == 32 && gsym->type() == elfcpp::STT_GNU_IFUNC)
+ got->add_global_plt(gsym, GOT_TYPE_STANDARD);
+ else
+ got->add_global(gsym, GOT_TYPE_STANDARD);
+ }
+ else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
+ {
+ // If we are generating a shared object or a pie, this
+ // symbol's GOT entry will be set by a dynamic relocation.
+ unsigned int off = got->add_constant(0);
+ gsym->set_got_offset(GOT_TYPE_STANDARD, off);
+
Reloc_section* rela_dyn = target->rela_dyn_section(layout);
- if (gsym->is_from_dynobj()
- || gsym->is_undefined()
- || gsym->is_preemptible())
- got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
- elfcpp::R_POWERPC_GLOB_DAT);
- else if (!gsym->has_got_offset(GOT_TYPE_STANDARD))
+ if (gsym->can_use_relative_reloc(false)
+ && !(size == 32
+ && gsym->visibility() == elfcpp::STV_PROTECTED
+ && parameters->options().shared()))
{
- unsigned int off = got->add_constant(0);
-
- gsym->set_got_offset(GOT_TYPE_STANDARD, off);
- rela_dyn->add_global_relative(gsym, elfcpp::R_POWERPC_RELATIVE,
- got, off, 0, false);
+ unsigned int dynrel = elfcpp::R_POWERPC_RELATIVE;
+ if (gsym->type() == elfcpp::STT_GNU_IFUNC)
+ {
+ rela_dyn = target->iplt_section()->rel_plt();
+ dynrel = elfcpp::R_POWERPC_IRELATIVE;
+ }
+ rela_dyn->add_global_relative(gsym, dynrel, got, off, 0, false);
+ }
+ else
+ {
+ unsigned int dynrel = elfcpp::R_POWERPC_GLOB_DAT;
+ rela_dyn->add_global(gsym, dynrel, got, off, 0);
}
}
}
}
else if (tls_type == tls::TLSOPT_TO_IE)
{
- Output_data_got_powerpc<size, big_endian>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rel(gsym, GOT_TYPE_TPREL,
- target->rela_dyn_section(layout),
- elfcpp::R_POWERPC_TPREL);
+ if (!gsym->has_got_offset(GOT_TYPE_TPREL))
+ {
+ Output_data_got_powerpc<size, big_endian>* got
+ = target->got_section(symtab, layout);
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ if (gsym->is_undefined()
+ || gsym->is_from_dynobj())
+ {
+ got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn,
+ elfcpp::R_POWERPC_TPREL);
+ }
+ else
+ {
+ unsigned int off = got->add_constant(0);
+ gsym->set_got_offset(GOT_TYPE_TPREL, off);
+ unsigned int dynrel = elfcpp::R_POWERPC_TPREL;
+ rela_dyn->add_symbolless_global_addend(gsym, dynrel,
+ got, off, 0);
+ }
+ }
}
else if (tls_type == tls::TLSOPT_TO_LE)
{
{
Output_data_got_powerpc<size, big_endian>* got
= target->got_section(symtab, layout);
- got->add_global_with_rel(gsym, GOT_TYPE_DTPREL,
- target->rela_dyn_section(layout),
- elfcpp::R_POWERPC_DTPREL);
+ if (!gsym->final_value_is_known()
+ && (gsym->is_from_dynobj()
+ || gsym->is_undefined()
+ || gsym->is_preemptible()))
+ got->add_global_with_rel(gsym, GOT_TYPE_DTPREL,
+ target->rela_dyn_section(layout),
+ elfcpp::R_POWERPC_DTPREL);
+ else
+ got->add_global_tls(gsym, GOT_TYPE_DTPREL);
}
break;
const tls::Tls_optimization tls_type = target->optimize_tls_ie(final);
if (tls_type == tls::TLSOPT_NONE)
{
- Output_data_got_powerpc<size, big_endian>* got
- = target->got_section(symtab, layout);
- got->add_global_with_rel(gsym, GOT_TYPE_TPREL,
- target->rela_dyn_section(layout),
- elfcpp::R_POWERPC_TPREL);
+ if (!gsym->has_got_offset(GOT_TYPE_TPREL))
+ {
+ Output_data_got_powerpc<size, big_endian>* got
+ = target->got_section(symtab, layout);
+ Reloc_section* rela_dyn = target->rela_dyn_section(layout);
+ if (gsym->is_undefined()
+ || gsym->is_from_dynobj())
+ {
+ got->add_global_with_rel(gsym, GOT_TYPE_TPREL, rela_dyn,
+ elfcpp::R_POWERPC_TPREL);
+ }
+ else
+ {
+ unsigned int off = got->add_constant(0);
+ gsym->set_got_offset(GOT_TYPE_TPREL, off);
+ unsigned int dynrel = elfcpp::R_POWERPC_TPREL;
+ rela_dyn->add_symbolless_global_addend(gsym, dynrel,
+ got, off, 0);
+ }
+ }
}
else if (tls_type == tls::TLSOPT_TO_LE)
{
unsupported_reloc_global(object, r_type, gsym);
break;
}
+
+ switch (r_type)
+ {
+ case elfcpp::R_POWERPC_GOT_TLSLD16:
+ case elfcpp::R_POWERPC_GOT_TLSGD16:
+ case elfcpp::R_POWERPC_GOT_TPREL16:
+ case elfcpp::R_POWERPC_GOT_DTPREL16:
+ case elfcpp::R_POWERPC_GOT16:
+ case elfcpp::R_PPC64_GOT16_DS:
+ case elfcpp::R_PPC64_TOC16:
+ case elfcpp::R_PPC64_TOC16_DS:
+ ppc_object->set_has_small_toc_reloc();
+ default:
+ break;
+ }
}
// Process relocations for gc.
{
typedef Target_powerpc<size, big_endian> Powerpc;
typedef typename Target_powerpc<size, big_endian>::Scan Scan;
+ Powerpc_relobj<size, big_endian>* ppc_object
+ = static_cast<Powerpc_relobj<size, big_endian>*>(object);
+ if (size == 64)
+ ppc_object->set_opd_valid();
+ if (size == 64 && data_shndx == ppc_object->opd_shndx())
+ {
+ typename Powerpc_relobj<size, big_endian>::Access_from::iterator p;
+ for (p = ppc_object->access_from_map()->begin();
+ p != ppc_object->access_from_map()->end();
+ ++p)
+ {
+ Address dst_off = p->first;
+ unsigned int dst_indx = ppc_object->get_opd_ent(dst_off);
+ typename Powerpc_relobj<size, big_endian>::Section_refs::iterator s;
+ for (s = p->second.begin(); s != p->second.end(); ++s)
+ {
+ Object* src_obj = s->first;
+ unsigned int src_indx = s->second;
+ symtab->gc()->add_reference(src_obj, src_indx,
+ ppc_object, dst_indx);
+ }
+ p->second.clear();
+ }
+ ppc_object->access_from_map()->clear();
+ ppc_object->process_gc_mark(symtab);
+ // Don't look at .opd relocs as .opd will reference everything.
+ return;
+ }
gold::gc_process_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan,
typename Target_powerpc::Relocatable_size_for_reloc>(
plocal_symbols);
}
+// Handle target specific gc actions when adding a gc reference from
+// SRC_OBJ, SRC_SHNDX to a location specified by DST_OBJ, DST_SHNDX
+// and DST_OFF. For powerpc64, this adds a referenc to the code
+// section of a function descriptor.
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::do_gc_add_reference(
+ Symbol_table* symtab,
+ Object* src_obj,
+ unsigned int src_shndx,
+ Object* dst_obj,
+ unsigned int dst_shndx,
+ Address dst_off) const
+{
+ Powerpc_relobj<size, big_endian>* ppc_object
+ = static_cast<Powerpc_relobj<size, big_endian>*>(dst_obj);
+ if (size == 64
+ && !ppc_object->is_dynamic()
+ && dst_shndx == ppc_object->opd_shndx())
+ {
+ if (ppc_object->opd_valid())
+ {
+ dst_shndx = ppc_object->get_opd_ent(dst_off);
+ symtab->gc()->add_reference(src_obj, src_shndx, dst_obj, dst_shndx);
+ }
+ else
+ {
+ // If we haven't run scan_opd_relocs, we must delay
+ // processing this function descriptor reference.
+ ppc_object->add_reference(src_obj, src_shndx, dst_off);
+ }
+ }
+}
+
+// Add any special sections for this symbol to the gc work list.
+// For powerpc64, this adds the code section of a function
+// descriptor.
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::do_gc_mark_symbol(
+ Symbol_table* symtab,
+ Symbol* sym) const
+{
+ if (size == 64)
+ {
+ Powerpc_relobj<size, big_endian>* ppc_object
+ = static_cast<Powerpc_relobj<size, big_endian>*>(sym->object());
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ if (is_ordinary && shndx == ppc_object->opd_shndx())
+ {
+ Sized_symbol<size>* gsym = symtab->get_sized_symbol<size>(sym);
+ Address dst_off = gsym->value();
+ if (ppc_object->opd_valid())
+ {
+ unsigned int dst_indx = ppc_object->get_opd_ent(dst_off);
+ symtab->gc()->worklist().push(Section_id(ppc_object, dst_indx));
+ }
+ else
+ ppc_object->add_gc_mark(dst_off);
+ }
+ }
+}
+
// Scan relocations for a section.
template<int size, bool big_endian>
return;
}
- if (size == 32)
- {
- static Output_data_space* sdata;
-
- // Define _SDA_BASE_ at the start of the .sdata section.
- if (sdata == NULL)
- {
- // layout->find_output_section(".sdata") == NULL
- sdata = new Output_data_space(4, "** sdata");
- Output_section* os
- = layout->add_output_section_data(".sdata", 0,
- elfcpp::SHF_ALLOC
- | elfcpp::SHF_WRITE,
- sdata, ORDER_SMALL_DATA, false);
- symtab->define_in_output_data("_SDA_BASE_", NULL,
- Symbol_table::PREDEFINED,
- os, 32768, 0, elfcpp::STT_OBJECT,
- elfcpp::STB_LOCAL, elfcpp::STV_HIDDEN,
- 0, false, false);
- }
- }
-
gold::scan_relocs<size, big_endian, Powerpc, elfcpp::SHT_RELA, Scan>(
symtab,
layout,
plocal_symbols);
}
+// Functor class for processing the global symbol table.
+// Removes symbols defined on discarded opd entries.
+
+template<bool big_endian>
+class Global_symbol_visitor_opd
+{
+ public:
+ Global_symbol_visitor_opd()
+ { }
+
+ void
+ operator()(Sized_symbol<64>* sym)
+ {
+ if (sym->has_symtab_index()
+ || sym->source() != Symbol::FROM_OBJECT
+ || !sym->in_real_elf())
+ return;
+
+ Powerpc_relobj<64, big_endian>* symobj
+ = static_cast<Powerpc_relobj<64, big_endian>*>(sym->object());
+ if (symobj->is_dynamic()
+ || symobj->opd_shndx() == 0)
+ return;
+
+ bool is_ordinary;
+ unsigned int shndx = sym->shndx(&is_ordinary);
+ if (shndx == symobj->opd_shndx()
+ && symobj->get_opd_discard(sym->value()))
+ sym->set_symtab_index(-1U);
+ }
+};
+
+template<int size, bool big_endian>
+void
+Target_powerpc<size, big_endian>::define_save_restore_funcs(
+ Layout* layout,
+ Symbol_table* symtab)
+{
+ if (size == 64)
+ {
+ Output_data_save_res<64, big_endian>* savres
+ = new Output_data_save_res<64, big_endian>(symtab);
+ layout->add_output_section_data(".text", elfcpp::SHT_PROGBITS,
+ elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
+ savres, ORDER_TEXT, false);
+ }
+}
+
+// Sort linker created .got section first (for the header), then input
+// sections belonging to files using small model code.
+
+template<bool big_endian>
+class Sort_toc_sections
+{
+ public:
+ bool
+ operator()(const Output_section::Input_section& is1,
+ const Output_section::Input_section& is2) const
+ {
+ if (!is1.is_input_section() && is2.is_input_section())
+ return true;
+ bool small1
+ = (is1.is_input_section()
+ && (static_cast<const Powerpc_relobj<64, big_endian>*>(is1.relobj())
+ ->has_small_toc_reloc()));
+ bool small2
+ = (is2.is_input_section()
+ && (static_cast<const Powerpc_relobj<64, big_endian>*>(is2.relobj())
+ ->has_small_toc_reloc()));
+ return small1 && !small2;
+ }
+};
+
// Finalize the sections.
template<int size, bool big_endian>
Target_powerpc<size, big_endian>::do_finalize_sections(
Layout* layout,
const Input_objects*,
- Symbol_table*)
+ Symbol_table* symtab)
{
- // Fill in some more dynamic tags.
- const Reloc_section* rel_plt = (this->plt_ == NULL
- ? NULL
- : this->plt_->rel_plt());
- layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
- this->rela_dyn_, true, size == 32);
+ if (parameters->doing_static_link())
+ {
+ // At least some versions of glibc elf-init.o have a strong
+ // reference to __rela_iplt marker syms. A weak ref would be
+ // better..
+ if (this->iplt_ != NULL)
+ {
+ Reloc_section* rel = this->iplt_->rel_plt();
+ symtab->define_in_output_data("__rela_iplt_start", NULL,
+ Symbol_table::PREDEFINED, rel, 0, 0,
+ elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, false, true);
+ symtab->define_in_output_data("__rela_iplt_end", NULL,
+ Symbol_table::PREDEFINED, rel, 0, 0,
+ elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, true, true);
+ }
+ else
+ {
+ symtab->define_as_constant("__rela_iplt_start", NULL,
+ Symbol_table::PREDEFINED, 0, 0,
+ elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, true, false);
+ symtab->define_as_constant("__rela_iplt_end", NULL,
+ Symbol_table::PREDEFINED, 0, 0,
+ elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
+ elfcpp::STV_HIDDEN, 0, true, false);
+ }
+ }
- Output_data_dynamic* odyn = layout->dynamic_data();
- if (size == 32)
+ if (size == 64)
{
- if (this->got_ != NULL)
+ typedef Global_symbol_visitor_opd<big_endian> Symbol_visitor;
+ symtab->for_all_symbols<64, Symbol_visitor>(Symbol_visitor());
+
+ if (!parameters->options().relocatable())
{
- this->got_->finalize_data_size();
- odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT,
- this->got_, this->got_->g_o_t());
+ this->define_save_restore_funcs(layout, symtab);
+
+ // Annoyingly, we need to make these sections now whether or
+ // not we need them. If we delay until do_relax then we
+ // need to mess with the relaxation machinery checkpointing.
+ this->got_section(symtab, layout);
+ this->make_brlt_section(layout);
+
+ if (parameters->options().toc_sort())
+ {
+ Output_section* os = this->got_->output_section();
+ if (os != NULL && os->input_sections().size() > 1)
+ std::stable_sort(os->input_sections().begin(),
+ os->input_sections().end(),
+ Sort_toc_sections<big_endian>());
+ }
}
}
- else
+
+ // Fill in some more dynamic tags.
+ Output_data_dynamic* odyn = layout->dynamic_data();
+ if (odyn != NULL)
{
- if (this->glink_ != NULL)
+ const Reloc_section* rel_plt = (this->plt_ == NULL
+ ? NULL
+ : this->plt_->rel_plt());
+ layout->add_target_dynamic_tags(false, this->plt_, rel_plt,
+ this->rela_dyn_, true, size == 32);
+
+ if (size == 32)
+ {
+ if (this->got_ != NULL)
+ {
+ this->got_->finalize_data_size();
+ odyn->add_section_plus_offset(elfcpp::DT_PPC_GOT,
+ this->got_, this->got_->g_o_t());
+ }
+ }
+ else
{
- this->glink_->finalize_data_size();
- odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK,
- this->glink_,
- (this->glink_->pltresolve()
- + this->glink_->pltresolve_size - 32));
+ if (this->glink_ != NULL)
+ {
+ this->glink_->finalize_data_size();
+ odyn->add_section_plus_offset(elfcpp::DT_PPC64_GLINK,
+ this->glink_,
+ (this->glink_->pltresolve_size
+ - 32));
+ }
}
}
this->copy_relocs_.emit(this->rela_dyn_section(layout));
}
+// Return TRUE iff INSN is one we expect on a _LO variety toc/got
+// reloc.
+
+static bool
+ok_lo_toc_insn(uint32_t insn)
+{
+ return ((insn & (0x3f << 26)) == 14u << 26 /* addi */
+ || (insn & (0x3f << 26)) == 32u << 26 /* lwz */
+ || (insn & (0x3f << 26)) == 34u << 26 /* lbz */
+ || (insn & (0x3f << 26)) == 36u << 26 /* stw */
+ || (insn & (0x3f << 26)) == 38u << 26 /* stb */
+ || (insn & (0x3f << 26)) == 40u << 26 /* lhz */
+ || (insn & (0x3f << 26)) == 42u << 26 /* lha */
+ || (insn & (0x3f << 26)) == 44u << 26 /* sth */
+ || (insn & (0x3f << 26)) == 46u << 26 /* lmw */
+ || (insn & (0x3f << 26)) == 47u << 26 /* stmw */
+ || (insn & (0x3f << 26)) == 48u << 26 /* lfs */
+ || (insn & (0x3f << 26)) == 50u << 26 /* lfd */
+ || (insn & (0x3f << 26)) == 52u << 26 /* stfs */
+ || (insn & (0x3f << 26)) == 54u << 26 /* stfd */
+ || ((insn & (0x3f << 26)) == 58u << 26 /* lwa,ld,lmd */
+ && (insn & 3) != 1)
+ || ((insn & (0x3f << 26)) == 62u << 26 /* std, stmd */
+ && ((insn & 3) == 0 || (insn & 3) == 3))
+ || (insn & (0x3f << 26)) == 12u << 26 /* addic */);
+}
+
+// Return the value to use for a branch relocation.
+
+template<int size, bool big_endian>
+typename elfcpp::Elf_types<size>::Elf_Addr
+Target_powerpc<size, big_endian>::symval_for_branch(
+ Address value,
+ const Sized_symbol<size>* gsym,
+ Powerpc_relobj<size, big_endian>* object,
+ unsigned int *dest_shndx)
+{
+ *dest_shndx = 0;
+ if (size == 32)
+ return value;
+
+ // If the symbol is defined in an opd section, ie. is a function
+ // descriptor, use the function descriptor code entry address
+ Powerpc_relobj<size, big_endian>* symobj = object;
+ if (gsym != NULL
+ && gsym->source() != Symbol::FROM_OBJECT)
+ return value;
+ if (gsym != NULL)
+ symobj = static_cast<Powerpc_relobj<size, big_endian>*>(gsym->object());
+ unsigned int shndx = symobj->opd_shndx();
+ if (shndx == 0)
+ return value;
+ Address opd_addr = symobj->get_output_section_offset(shndx);
+ gold_assert(opd_addr != invalid_address);
+ opd_addr += symobj->output_section(shndx)->address();
+ if (value >= opd_addr && value < opd_addr + symobj->section_size(shndx))
+ {
+ Address sec_off;
+ *dest_shndx = symobj->get_opd_ent(value - opd_addr, &sec_off);
+ Address sec_addr = symobj->get_output_section_offset(*dest_shndx);
+ gold_assert(sec_addr != invalid_address);
+ sec_addr += symobj->output_section(*dest_shndx)->address();
+ value = sec_addr + sec_off;
+ }
+ return value;
+}
+
// Perform a relocation.
template<int size, bool big_endian>
Address address,
section_size_type view_size)
{
-
bool is_tls_call = ((r_type == elfcpp::R_POWERPC_REL24
|| r_type == elfcpp::R_PPC_PLTREL24)
&& gsym != NULL
typedef Powerpc_relocate_functions<size, big_endian> Reloc;
typedef typename elfcpp::Swap<32, big_endian>::Valtype Insn;
- const Powerpc_relobj<size, big_endian>* const object
- = static_cast<const Powerpc_relobj<size, big_endian>*>(relinfo->object);
+ Powerpc_relobj<size, big_endian>* const object
+ = static_cast<Powerpc_relobj<size, big_endian>*>(relinfo->object);
Address value = 0;
bool has_plt_value = false;
+ unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
if (gsym != NULL
- && use_plt_offset<size>(gsym, Scan::get_reference_flags(r_type)))
+ ? use_plt_offset<size>(gsym, Scan::get_reference_flags(r_type))
+ : object->local_has_plt_offset(r_sym))
{
- const Output_data_glink<size, big_endian>* glink
- = target->glink_section();
- unsigned int glink_index = glink->find_entry(gsym, rela, object);
- value = glink->address() + glink_index * glink->glink_entry_size();
+ Stub_table<size, big_endian>* stub_table
+ = object->stub_table(relinfo->data_shndx);
+ if (stub_table == NULL)
+ {
+ // This is a ref from a data section to an ifunc symbol.
+ if (target->stub_tables().size() != 0)
+ stub_table = target->stub_tables()[0];
+ }
+ gold_assert(stub_table != NULL);
+ Address off;
+ if (gsym != NULL)
+ off = stub_table->find_plt_call_entry(object, gsym, r_type,
+ rela.get_r_addend());
+ else
+ off = stub_table->find_plt_call_entry(object, r_sym, r_type,
+ rela.get_r_addend());
+ gold_assert(off != invalid_address);
+ value = stub_table->stub_address() + off;
has_plt_value = true;
}
bool can_plt_call = false;
if (rela.get_r_offset() + 8 <= view_size)
{
+ Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
Valtype insn2 = elfcpp::Swap<32, big_endian>::readval(wv + 1);
- if (insn2 == nop
- || insn2 == cror_15_15_15 || insn2 == cror_31_31_31)
+ if ((insn & 1) != 0
+ && (insn2 == nop
+ || insn2 == cror_15_15_15 || insn2 == cror_31_31_31))
{
elfcpp::Swap<32, big_endian>::writeval(wv + 1, ld_2_1 + 40);
can_plt_call = true;
}
}
if (!can_plt_call)
- gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
- _("call lacks nop, can't restore toc"));
+ {
+ // If we don't have a branch and link followed by a nop,
+ // we can't go via the plt because there is no place to
+ // put a toc restoring instruction.
+ // Unless we know we won't be returning.
+ if (strcmp(gsym->name(), "__libc_start_main") == 0)
+ can_plt_call = true;
+ }
+ if (!can_plt_call)
+ {
+ // This is not an error in one special case: A self
+ // call. It isn't possible to cheaply verify we have
+ // such a call so just check for a call to the same
+ // section.
+ bool ok = false;
+ Address code = value;
+ if (gsym->source() == Symbol::FROM_OBJECT
+ && gsym->object() == object)
+ {
+ Address addend = rela.get_r_addend();
+ unsigned int dest_shndx;
+ Address opdent = psymval->value(object, addend);
+ code = target->symval_for_branch(opdent, gsym, object,
+ &dest_shndx);
+ bool is_ordinary;
+ if (dest_shndx == 0)
+ dest_shndx = gsym->shndx(&is_ordinary);
+ ok = dest_shndx == relinfo->data_shndx;
+ }
+ if (!ok)
+ {
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("call lacks nop, can't restore toc; "
+ "recompile with -fPIC"));
+ value = code;
+ }
+ }
}
}
else if (r_type == elfcpp::R_POWERPC_GOT_TLSGD16
value = psymval->value(object, rela.get_r_addend());
}
}
- else
+ else if (!has_plt_value)
{
Address addend = 0;
+ unsigned int dest_shndx;
if (r_type != elfcpp::R_PPC_PLTREL24)
addend = rela.get_r_addend();
- if (size == 64 || !has_plt_value)
- value = psymval->value(object, addend);
+ value = psymval->value(object, addend);
if (size == 64 && is_branch_reloc(r_type))
+ value = target->symval_for_branch(value, gsym, object, &dest_shndx);
+ unsigned int max_branch_offset = 0;
+ if (r_type == elfcpp::R_POWERPC_REL24
+ || r_type == elfcpp::R_PPC_PLTREL24
+ || r_type == elfcpp::R_PPC_LOCAL24PC)
+ max_branch_offset = 1 << 25;
+ else if (r_type == elfcpp::R_POWERPC_REL14
+ || r_type == elfcpp::R_POWERPC_REL14_BRTAKEN
+ || r_type == elfcpp::R_POWERPC_REL14_BRNTAKEN)
+ max_branch_offset = 1 << 15;
+ if (max_branch_offset != 0
+ && value - address + max_branch_offset >= 2 * max_branch_offset)
{
- // If the symbol is defined in an opd section, ie. is a function
- // descriptor, use the function descriptor code entry address
- Powerpc_relobj<size, big_endian>* symobj = const_cast
- <Powerpc_relobj<size, big_endian>*>(object);
- if (gsym != NULL)
- symobj = static_cast
- <Powerpc_relobj<size, big_endian>*>(gsym->object());
- unsigned int shndx = symobj->opd_shndx();
- Address opd_addr = symobj->get_output_section_offset(shndx);
- gold_assert(opd_addr != invalid_address);
- opd_addr += symobj->output_section(shndx)->address();
- if (value >= opd_addr
- && value < opd_addr + symobj->section_size(shndx))
- {
- Address sec_off;
- symobj->get_opd_ent(value - opd_addr, &shndx, &sec_off);
- Address sec_addr = symobj->get_output_section_offset(shndx);
- gold_assert(sec_addr != invalid_address);
- sec_addr += symobj->output_section(shndx)->address();
- value = sec_addr + sec_off;
- }
+ Stub_table<size, big_endian>* stub_table
+ = object->stub_table(relinfo->data_shndx);
+ gold_assert(stub_table != NULL);
+ Address off = stub_table->find_long_branch_entry(object, value);
+ if (off != invalid_address)
+ value = stub_table->stub_address() + stub_table->plt_size() + off;
}
}
break;
}
- enum Reloc::overflow_check overflow = Reloc::check_none;
+ if (size == 64)
+ {
+ // Multi-instruction sequences that access the TOC can be
+ // optimized, eg. addis ra,r2,0; addi rb,ra,x;
+ // to nop; addi rb,r2,x;
+ switch (r_type)
+ {
+ default:
+ break;
+
+ case elfcpp::R_POWERPC_GOT_TLSLD16_HA:
+ case elfcpp::R_POWERPC_GOT_TLSGD16_HA:
+ case elfcpp::R_POWERPC_GOT_TPREL16_HA:
+ case elfcpp::R_POWERPC_GOT_DTPREL16_HA:
+ case elfcpp::R_POWERPC_GOT16_HA:
+ case elfcpp::R_PPC64_TOC16_HA:
+ if (parameters->options().toc_optimize())
+ {
+ Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
+ Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
+ if ((insn & ((0x3f << 26) | 0x1f << 16))
+ != ((15u << 26) | (2 << 16)) /* addis rt,2,imm */)
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("toc optimization is not supported "
+ "for %#08x instruction"), insn);
+ else if (value + 0x8000 < 0x10000)
+ {
+ elfcpp::Swap<32, big_endian>::writeval(iview, nop);
+ return true;
+ }
+ }
+ break;
+
+ case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
+ case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
+ case elfcpp::R_POWERPC_GOT_TPREL16_LO:
+ case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
+ case elfcpp::R_POWERPC_GOT16_LO:
+ case elfcpp::R_PPC64_GOT16_LO_DS:
+ case elfcpp::R_PPC64_TOC16_LO:
+ case elfcpp::R_PPC64_TOC16_LO_DS:
+ if (parameters->options().toc_optimize())
+ {
+ Insn* iview = reinterpret_cast<Insn*>(view - 2 * big_endian);
+ Insn insn = elfcpp::Swap<32, big_endian>::readval(iview);
+ if (!ok_lo_toc_insn(insn))
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("toc optimization is not supported "
+ "for %#08x instruction"), insn);
+ else if (value + 0x8000 < 0x10000)
+ {
+ if ((insn & (0x3f << 26)) == 12u << 26 /* addic */)
+ {
+ // Transform addic to addi when we change reg.
+ insn &= ~((0x3f << 26) | (0x1f << 16));
+ insn |= (14u << 26) | (2 << 16);
+ }
+ else
+ {
+ insn &= ~(0x1f << 16);
+ insn |= 2 << 16;
+ }
+ elfcpp::Swap<32, big_endian>::writeval(iview, insn);
+ }
+ }
+ break;
+ }
+ }
+
+ typename Reloc::Overflow_check overflow = Reloc::CHECK_NONE;
switch (r_type)
{
case elfcpp::R_POWERPC_ADDR32:
case elfcpp::R_POWERPC_UADDR32:
if (size == 64)
- overflow = Reloc::check_bitfield;
+ overflow = Reloc::CHECK_BITFIELD;
break;
case elfcpp::R_POWERPC_REL32:
if (size == 64)
- overflow = Reloc::check_signed;
+ overflow = Reloc::CHECK_SIGNED;
break;
case elfcpp::R_POWERPC_ADDR24:
case elfcpp::R_POWERPC_ADDR14:
case elfcpp::R_POWERPC_ADDR14_BRTAKEN:
case elfcpp::R_POWERPC_ADDR14_BRNTAKEN:
- overflow = Reloc::check_bitfield;
+ overflow = Reloc::CHECK_BITFIELD;
break;
case elfcpp::R_POWERPC_REL24:
case elfcpp::R_POWERPC_GOT_TLSLD16:
case elfcpp::R_POWERPC_GOT_TPREL16:
case elfcpp::R_POWERPC_GOT_DTPREL16:
- overflow = Reloc::check_signed;
+ overflow = Reloc::CHECK_SIGNED;
break;
}
+ typename Powerpc_relocate_functions<size, big_endian>::Status status
+ = Powerpc_relocate_functions<size, big_endian>::STATUS_OK;
switch (r_type)
{
case elfcpp::R_POWERPC_NONE:
if (size == 64)
Reloc::addr64(view, value);
else
- Reloc::addr32(view, value, overflow);
+ status = Reloc::addr32(view, value, overflow);
break;
case elfcpp::R_PPC64_UADDR64:
break;
case elfcpp::R_POWERPC_ADDR32:
- case elfcpp::R_POWERPC_REL32:
- Reloc::addr32(view, value, overflow);
+ status = Reloc::addr32(view, value, overflow);
break;
+ case elfcpp::R_POWERPC_REL32:
case elfcpp::R_POWERPC_UADDR32:
- Reloc::addr32_u(view, value, overflow);
+ status = Reloc::addr32_u(view, value, overflow);
break;
case elfcpp::R_POWERPC_ADDR24:
case elfcpp::R_POWERPC_REL24:
case elfcpp::R_PPC_PLTREL24:
case elfcpp::R_PPC_LOCAL24PC:
- Reloc::addr24(view, value, overflow);
+ status = Reloc::addr24(view, value, overflow);
break;
case elfcpp::R_POWERPC_GOT_DTPREL16:
case elfcpp::R_POWERPC_GOT_DTPREL16_LO:
if (size == 64)
{
- Reloc::addr16_ds(view, value, overflow);
+ status = Reloc::addr16_ds(view, value, overflow);
break;
}
case elfcpp::R_POWERPC_ADDR16:
case elfcpp::R_POWERPC_GOT_TLSGD16_LO:
case elfcpp::R_POWERPC_GOT_TLSLD16_LO:
case elfcpp::R_POWERPC_GOT_TPREL16_LO:
- Reloc::addr16(view, value, overflow);
+ status = Reloc::addr16(view, value, overflow);
break;
case elfcpp::R_POWERPC_UADDR16:
- Reloc::addr16_u(view, value, overflow);
+ status = Reloc::addr16_u(view, value, overflow);
break;
case elfcpp::R_POWERPC_ADDR16_HI:
case elfcpp::R_PPC64_GOT16_LO_DS:
case elfcpp::R_PPC64_SECTOFF_DS:
case elfcpp::R_PPC64_SECTOFF_LO_DS:
- Reloc::addr16_ds(view, value, overflow);
+ status = Reloc::addr16_ds(view, value, overflow);
break;
case elfcpp::R_POWERPC_ADDR14:
case elfcpp::R_POWERPC_REL14:
case elfcpp::R_POWERPC_REL14_BRTAKEN:
case elfcpp::R_POWERPC_REL14_BRNTAKEN:
- Reloc::addr14(view, value, overflow);
+ status = Reloc::addr14(view, value, overflow);
break;
case elfcpp::R_POWERPC_COPY:
r_type);
break;
}
+ if (status != Powerpc_relocate_functions<size, big_endian>::STATUS_OK)
+ gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
+ _("relocation overflow"));
return true;
}
{
typedef Target_powerpc<size, big_endian> Powerpc;
typedef typename Target_powerpc<size, big_endian>::Relocate Powerpc_relocate;
+ typedef typename Target_powerpc<size, big_endian>::Relocate_comdat_behavior
+ Powerpc_comdat_behavior;
gold_assert(sh_type == elfcpp::SHT_RELA);
gold::relocate_section<size, big_endian, Powerpc, elfcpp::SHT_RELA,
- Powerpc_relocate>(
+ Powerpc_relocate, Powerpc_comdat_behavior>(
relinfo,
this,
prelocs,
const unsigned char* prelocs,
size_t reloc_count,
Output_section* output_section,
- off_t offset_in_output_section,
+ typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
const Relocatable_relocs* rr,
unsigned char*,
Address view_address,
== reloc_view_size);
}
-// Return the value to use for a dynamic which requires special
+// Return the value to use for a dynamic symbol which requires special
// treatment. This is how we support equality comparisons of function
// pointers across shared library boundaries, as described in the
// processor specific ABI supplement.
if (size == 32)
{
gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
- return this->plt_section()->address() + gsym->plt_offset();
+ for (typename Stub_tables::const_iterator p = this->stub_tables_.begin();
+ p != this->stub_tables_.end();
+ ++p)
+ {
+ Address off = (*p)->find_plt_call_entry(gsym);
+ if (off != invalid_address)
+ return (*p)->stub_address() + off;
+ }
}
- else
- gold_unreachable();
+ gold_unreachable();
+}
+
+// Return the PLT address to use for a local symbol.
+template<int size, bool big_endian>
+uint64_t
+Target_powerpc<size, big_endian>::do_plt_address_for_local(
+ const Relobj* object,
+ unsigned int symndx) const
+{
+ if (size == 32)
+ {
+ const Sized_relobj<size, big_endian>* relobj
+ = static_cast<const Sized_relobj<size, big_endian>*>(object);
+ for (typename Stub_tables::const_iterator p = this->stub_tables_.begin();
+ p != this->stub_tables_.end();
+ ++p)
+ {
+ Address off = (*p)->find_plt_call_entry(relobj->sized_relobj(),
+ symndx);
+ if (off != invalid_address)
+ return (*p)->stub_address() + off;
+ }
+ }
+ gold_unreachable();
+}
+
+// Return the PLT address to use for a global symbol.
+template<int size, bool big_endian>
+uint64_t
+Target_powerpc<size, big_endian>::do_plt_address_for_global(
+ const Symbol* gsym) const
+{
+ if (size == 32)
+ {
+ for (typename Stub_tables::const_iterator p = this->stub_tables_.begin();
+ p != this->stub_tables_.end();
+ ++p)
+ {
+ Address off = (*p)->find_plt_call_entry(gsym);
+ if (off != invalid_address)
+ return (*p)->stub_address() + off;
+ }
+ }
+ gold_unreachable();
+}
+
+// Return the offset to use for the GOT_INDX'th got entry which is
+// for a local tls symbol specified by OBJECT, SYMNDX.
+template<int size, bool big_endian>
+int64_t
+Target_powerpc<size, big_endian>::do_tls_offset_for_local(
+ const Relobj* object,
+ unsigned int symndx,
+ unsigned int got_indx) const
+{
+ const Powerpc_relobj<size, big_endian>* ppc_object
+ = static_cast<const Powerpc_relobj<size, big_endian>*>(object);
+ if (ppc_object->local_symbol(symndx)->is_tls_symbol())
+ {
+ for (Got_type got_type = GOT_TYPE_TLSGD;
+ got_type <= GOT_TYPE_TPREL;
+ got_type = Got_type(got_type + 1))
+ if (ppc_object->local_has_got_offset(symndx, got_type))
+ {
+ unsigned int off = ppc_object->local_got_offset(symndx, got_type);
+ if (got_type == GOT_TYPE_TLSGD)
+ off += size / 8;
+ if (off == got_indx * (size / 8))
+ {
+ if (got_type == GOT_TYPE_TPREL)
+ return -tp_offset;
+ else
+ return -dtp_offset;
+ }
+ }
+ }
+ gold_unreachable();
+}
+
+// Return the offset to use for the GOT_INDX'th got entry which is
+// for global tls symbol GSYM.
+template<int size, bool big_endian>
+int64_t
+Target_powerpc<size, big_endian>::do_tls_offset_for_global(
+ Symbol* gsym,
+ unsigned int got_indx) const
+{
+ if (gsym->type() == elfcpp::STT_TLS)
+ {
+ for (Got_type got_type = GOT_TYPE_TLSGD;
+ got_type <= GOT_TYPE_TPREL;
+ got_type = Got_type(got_type + 1))
+ if (gsym->has_got_offset(got_type))
+ {
+ unsigned int off = gsym->got_offset(got_type);
+ if (got_type == GOT_TYPE_TLSGD)
+ off += size / 8;
+ if (off == got_indx * (size / 8))
+ {
+ if (got_type == GOT_TYPE_TPREL)
+ return -tp_offset;
+ else
+ return -dtp_offset;
+ }
+ }
+ }
+ gold_unreachable();
}
// The selector for powerpc object files.
{
public:
Target_selector_powerpc()
- : Target_selector(elfcpp::EM_NONE, size, big_endian,
+ : Target_selector(size == 64 ? elfcpp::EM_PPC64 : elfcpp::EM_PPC,
+ size, big_endian,
(size == 64
? (big_endian ? "elf64-powerpc" : "elf64-powerpcle")
: (big_endian ? "elf32-powerpc" : "elf32-powerpcle")),
: (big_endian ? "elf32ppc" : "elf32lppc")))
{ }
- virtual Target*
- do_recognize(Input_file*, off_t, int machine, int, int)
- {
- switch (size)
- {
- case 64:
- if (machine != elfcpp::EM_PPC64)
- return NULL;
- break;
-
- case 32:
- if (machine != elfcpp::EM_PPC)
- return NULL;
- break;
-
- default:
- return NULL;
- }
-
- return this->instantiate_target();
- }
-
virtual Target*
do_instantiate_target()
{ return new Target_powerpc<size, big_endian>(); }
Target_selector_powerpc<64, true> target_selector_ppc64;
Target_selector_powerpc<64, false> target_selector_ppc64le;
+// Instantiate these constants for -O0
+template<int size, bool big_endian>
+const int Output_data_glink<size, big_endian>::pltresolve_size;
+template<int size, bool big_endian>
+const typename Stub_table<size, big_endian>::Address
+ Stub_table<size, big_endian>::invalid_address;
+template<int size, bool big_endian>
+const typename Target_powerpc<size, big_endian>::Address
+ Target_powerpc<size, big_endian>::invalid_address;
+
} // End anonymous namespace.