// target.h -- target support for gold -*- C++ -*-
-// Copyright (C) 2006-2014 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
{ return this->pti_->dynamic_linker; }
// Return the default address to use for the text segment.
+ // If a -z max-page-size argument has set the ABI page size
+ // to a value larger than the default starting address,
+ // bump the starting address up to the page size, to avoid
+ // misaligning the text segment in the file.
uint64_t
default_text_segment_address() const
- { return this->pti_->default_text_segment_address; }
+ {
+ uint64_t addr = this->pti_->default_text_segment_address;
+ uint64_t pagesize = this->abi_pagesize();
+ if (addr < pagesize)
+ addr = pagesize;
+ return addr;
+ }
// Return the ABI specified page size.
uint64_t
ehframe_datarel_base() const
{ return this->do_ehframe_datarel_base(); }
- // Return true if a reference to SYM from a reloc of type R_TYPE
+ // Return true if a reference to SYM from a reloc at *PRELOC
// means that the current function may call an object compiled
// without -fsplit-stack. SYM is known to be defined in an object
// compiled without -fsplit-stack.
bool
- is_call_to_non_split(const Symbol* sym, unsigned int r_type) const
- { return this->do_is_call_to_non_split(sym, r_type); }
+ is_call_to_non_split(const Symbol* sym, const unsigned char* preloc,
+ const unsigned char* view,
+ section_size_type view_size) const
+ { return this->do_is_call_to_non_split(sym, preloc, view, view_size); }
// A function starts at OFFSET in section SHNDX in OBJECT. That
// function was compiled with -fsplit-stack, but it refers to a
void
calls_non_split(Relobj* object, unsigned int shndx,
section_offset_type fnoffset, section_size_type fnsize,
+ const unsigned char* prelocs, size_t reloc_count,
unsigned char* view, section_size_type view_size,
std::string* from, std::string* to) const
{
- this->do_calls_non_split(object, shndx, fnoffset, fnsize, view, view_size,
+ this->do_calls_non_split(object, shndx, fnoffset, fnsize,
+ prelocs, reloc_count, view, view_size,
from, to);
}
entry_symbol_name() const
{ return this->pti_->entry_symbol_name; }
+ // Return the size in bits of SHT_HASH entry.
+ int
+ hash_entry_size() const
+ { return this->pti_->hash_entry_size; }
+
+ // Return the section type to use for unwind sections.
+ unsigned int
+ unwind_section_type() const
+ { return this->pti_->unwind_section_type; }
+
// Whether the target has a custom set_dynsym_indexes method.
bool
has_custom_set_dynsym_indexes() const
dynamic_tag_custom_value(elfcpp::DT tag) const
{ return this->do_dynamic_tag_custom_value(tag); }
+ // Adjust the value written to the dynamic symbol table.
+ void
+ adjust_dyn_symbol(const Symbol* sym, unsigned char* view) const
+ { this->do_adjust_dyn_symbol(sym, view); }
+
+ // Return whether to include the section in the link.
+ bool
+ should_include_section(elfcpp::Elf_Word sh_type) const
+ { return this->do_should_include_section(sh_type); }
+
+ // Finalize the target-specific properties in the .note.gnu.property section.
+ void
+ finalize_gnu_properties(Layout* layout) const
+ { this->do_finalize_gnu_properties(layout); }
+
protected:
// This struct holds the constant information for a child class. We
// use a struct to avoid the overhead of virtual function calls for
const char* attributes_vendor;
// Name of the main entry point to the program.
const char* entry_symbol_name;
+ // Size (in bits) of SHT_HASH entry. Always equal to 32, except for
+ // 64-bit S/390.
+ const int hash_entry_size;
+ // Processor-specific section type for ".eh_frame" (unwind) sections.
+ // SHT_PROGBITS if there is no special section type.
+ const unsigned int unwind_section_type;
};
Target(const Target_info* pti)
// default implementation is that any function not defined by the
// ABI is a call to a non-split function.
virtual bool
- do_is_call_to_non_split(const Symbol* sym, unsigned int) const;
+ do_is_call_to_non_split(const Symbol* sym, const unsigned char*,
+ const unsigned char*, section_size_type) const;
// Virtual function which may be overridden by the child class.
virtual void
do_calls_non_split(Relobj* object, unsigned int, section_offset_type,
- section_size_type, unsigned char*, section_size_type,
+ section_size_type, const unsigned char*, size_t,
+ unsigned char*, section_size_type,
std::string*, std::string*) const;
// make_elf_object hooks. There are four versions of these for
do_dynamic_tag_custom_value(elfcpp::DT) const
{ gold_unreachable(); }
+ // This may be overridden by the child class.
+ virtual void
+ do_adjust_dyn_symbol(const Symbol*, unsigned char*) const
+ { }
+
+ // This may be overridden by the child class.
+ virtual bool
+ do_should_include_section(elfcpp::Elf_Word) const
+ { return true; }
+
+ // Finalize the target-specific properties in the .note.gnu.property section.
+ virtual void
+ do_finalize_gnu_properties(Layout*) const
+ { }
+
private:
// The implementations of the four do_make_elf_object virtual functions are
// almost identical except for their sizes and endianness. We use a template.
// symbol table. This will only be called if has_make_symbol()
// returns true.
virtual Sized_symbol<size>*
- make_symbol() const
+ make_symbol(const char*, elfcpp::STT, Object*, unsigned int, uint64_t)
{ gold_unreachable(); }
// Resolve a symbol for the target. This should be overridden by a
// pre-existing symbol. SYM is the new symbol, seen in OBJECT.
// VERSION is the version of SYM. This will only be called if
// has_resolve() returns true.
- virtual void
+ virtual bool
resolve(Symbol*, const elfcpp::Sym<size, big_endian>&, Object*,
const char*)
{ gold_unreachable(); }
const unsigned char* plocal_symbols,
Relocatable_relocs*) = 0;
+ // Scan the relocs for --emit-relocs. The parameters are
+ // like scan_relocatable_relocs.
+ virtual void
+ emit_relocs_scan(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_syms,
+ Relocatable_relocs* rr) = 0;
+
// Emit relocations for a section during a relocatable link, and for
// --emit-relocs. The parameters are like relocate_section, with
// additional parameters for the view of the output reloc section.
Output_section* output_section,
typename elfcpp::Elf_types<size>::Elf_Off
offset_in_output_section,
- const Relocatable_relocs*,
unsigned char* view,
typename elfcpp::Elf_types<size>::Elf_Addr view_address,
section_size_type view_size,
plt_entry_size() const
{ gold_unreachable(); }
+ // Return the size of each GOT entry. This is only used for
+ // laying out the incremental link info sections. A target needs
+ // to implement this if its GOT size is different.
+
+ virtual unsigned int
+ got_entry_size() const
+ { return size / 8; }
+
// Create the GOT and PLT sections for an incremental update.
// A target needs to implement this to support incremental linking.
// and DST_OFF.
void
gc_add_reference(Symbol_table* symtab,
- Object* src_obj,
+ Relobj* src_obj,
unsigned int src_shndx,
- Object* dst_obj,
+ Relobj* dst_obj,
unsigned int dst_shndx,
typename elfcpp::Elf_types<size>::Elf_Addr dst_off) const
{
dst_obj, dst_shndx, dst_off);
}
+ // Return the r_sym field from a relocation.
+ // Most targets can use the default version of this routine,
+ // but some targets have a non-standard r_info field, and will
+ // need to provide a target-specific version.
+ virtual unsigned int
+ get_r_sym(const unsigned char* preloc) const
+ {
+ // Since REL and RELA relocs share the same structure through
+ // the r_info field, we can just use REL here.
+ elfcpp::Rel<size, big_endian> rel(preloc);
+ return elfcpp::elf_r_sym<size>(rel.get_r_info());
+ }
+
+ // Record a target-specific program property in the .note.gnu.property
+ // section.
+ virtual void
+ record_gnu_property(unsigned int, unsigned int, size_t,
+ const unsigned char*, const Object*)
+ { }
+
+ // Merge the target-specific program properties from the current object.
+ virtual void
+ merge_gnu_properties(const Object*)
+ { }
+
protected:
Sized_target(const Target::Target_info* pti)
: Target(pti)
// Handle target specific gc actions when adding a gc reference.
virtual void
- do_gc_add_reference(Symbol_table*, Object*, unsigned int,
- Object*, unsigned int,
+ do_gc_add_reference(Symbol_table*, Relobj*, unsigned int,
+ Relobj*, unsigned int,
typename elfcpp::Elf_types<size>::Elf_Addr) const
{ }
projects / deliverable / binutils-gdb.git / blobdiff