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authorIan Lance Taylor <iant@google.com>2006-10-20 20:40:49 +0000
committerIan Lance Taylor <iant@google.com>2006-10-20 20:40:49 +0000
commit92e059d8dc78c3f65e29e48e368f6e47ea0ab671 (patch)
treef448eb3317d9cbb0f5946422cc28ef157a5f65cb /gold/reloc.h
parentaf4658dc3db33004d6166b161588221ecb463a5f (diff)
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Framework for relocation scanning. Implement simple static TLS
relocations.
Diffstat (limited to 'gold/reloc.h')
-rw-r--r--gold/reloc.h506
1 files changed, 503 insertions, 3 deletions
diff --git a/gold/reloc.h b/gold/reloc.h
index 287bb79..a2e9d54 100644
--- a/gold/reloc.h
+++ b/gold/reloc.h
@@ -3,18 +3,98 @@
#ifndef GOLD_RELOC_H
#define GOLD_RELOC_H
+#include <byteswap.h>
+
#include "workqueue.h"
namespace gold
{
+class Object;
+class Read_relocs_data;
+class Stringpool;
+
+// A class to read the relocations for an object file, and then queue
+// up a task to see if they require any GOT/PLT/COPY relocations in
+// the symbol table.
+
+class Read_relocs : public Task
+{
+ public:
+ // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
+ // unblocked when the Scan_relocs task completes.
+ Read_relocs(const General_options& options, Symbol_table* symtab,
+ Object* object, Task_token* symtab_lock,
+ Task_token* blocker)
+ : options_(options), symtab_(symtab), object_(object),
+ symtab_lock_(symtab_lock), blocker_(blocker)
+ { }
+
+ // The standard Task methods.
+
+ Is_runnable_type
+ is_runnable(Workqueue*);
+
+ Task_locker*
+ locks(Workqueue*);
+
+ void
+ run(Workqueue*);
+
+ private:
+ const General_options& options_;
+ Symbol_table* symtab_;
+ Object* object_;
+ Task_token* symtab_lock_;
+ Task_token* blocker_;
+};
+
+// Scan the relocations for an object to see if they require any
+// GOT/PLT/COPY relocations.
+
+class Scan_relocs : public Task
+{
+ public:
+ // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be
+ // unblocked when the task completes.
+ Scan_relocs(const General_options& options, Symbol_table* symtab,
+ Object* object, Read_relocs_data* rd, Task_token* symtab_lock,
+ Task_token* blocker)
+ : options_(options), symtab_(symtab), object_(object), rd_(rd),
+ symtab_lock_(symtab_lock), blocker_(blocker)
+ { }
+
+ // The standard Task methods.
+
+ Is_runnable_type
+ is_runnable(Workqueue*);
+
+ Task_locker*
+ locks(Workqueue*);
+
+ void
+ run(Workqueue*);
+
+ private:
+ class Scan_relocs_locker;
+
+ const General_options& options_;
+ Symbol_table* symtab_;
+ Object* object_;
+ Read_relocs_data* rd_;
+ Task_token* symtab_lock_;
+ Task_token* blocker_;
+};
+
+// A class to perform all the relocations for an object file.
+
class Relocate_task : public Task
{
public:
Relocate_task(const General_options& options, const Symbol_table* symtab,
- const Stringpool* sympool, Object* object, Output_file* of,
+ const Layout* layout, Object* object, Output_file* of,
Task_token* final_blocker)
- : options_(options), symtab_(symtab), sympool_(sympool), object_(object),
+ : options_(options), symtab_(symtab), layout_(layout), object_(object),
of_(of), final_blocker_(final_blocker)
{ }
@@ -34,12 +114,432 @@ class Relocate_task : public Task
const General_options& options_;
const Symbol_table* symtab_;
- const Stringpool* sympool_;
+ const Layout* layout_;
Object* object_;
Output_file* of_;
Task_token* final_blocker_;
};
+// Integer swapping routines used by relocation functions. FIXME:
+// Maybe these should be more general, and/or shared with elfcpp.
+
+// Endian simply indicates whether the host is big endian or not,
+// based on the results of the configure script.
+
+struct Endian
+{
+ public:
+ // Used for template specializations.
+#ifdef WORDS_BIGENDIAN
+ static const bool host_big_endian = true;
+#else
+ static const bool host_big_endian = false;
+#endif
+};
+
+// Valtype_base is a template based on size (8, 16, 32, 64) which
+// defines a typedef Valtype for the unsigned integer of the specified
+// size.
+
+template<int size>
+struct Valtype_base;
+
+template<>
+struct Valtype_base<8>
+{
+ typedef unsigned char Valtype;
+};
+
+template<>
+struct Valtype_base<16>
+{
+ typedef uint16_t Valtype;
+};
+
+template<>
+struct Valtype_base<32>
+{
+ typedef uint32_t Valtype;
+};
+
+template<>
+struct Valtype_base<64>
+{
+ typedef uint64_t Valtype;
+};
+
+// Convert_host is a template based on size and on whether the host
+// and target have the same endianness. It defines the type Valtype,
+// and defines a function convert_host which takes an argument of type
+// Valtype and swaps it if the host and target have different
+// endianness.
+
+template<int size, bool same_endian>
+struct Convert_host;
+
+template<int size>
+struct Convert_host<size, true>
+{
+ typedef typename Valtype_base<size>::Valtype Valtype;
+
+ static inline Valtype
+ convert_host(Valtype v)
+ { return v; }
+};
+
+template<>
+struct Convert_host<8, false>
+{
+ typedef Valtype_base<8>::Valtype Valtype;
+
+ static inline Valtype
+ convert_host(Valtype v)
+ { return v; }
+};
+
+template<>
+struct Convert_host<16, false>
+{
+ typedef Valtype_base<16>::Valtype Valtype;
+
+ static inline Valtype
+ convert_host(Valtype v)
+ { return bswap_16(v); }
+};
+
+template<>
+struct Convert_host<32, false>
+{
+ typedef Valtype_base<32>::Valtype Valtype;
+
+ static inline Valtype
+ convert_host(Valtype v)
+ { return bswap_32(v); }
+};
+
+template<>
+struct Convert_host<64, false>
+{
+ typedef Valtype_base<64>::Valtype Valtype;
+
+ static inline Valtype
+ convert_host(Valtype v)
+ { return bswap_64(v); }
+};
+
+// Convert is a template based on size and on whether we have a big
+// endian target. It defines Valtype and convert_host like
+// Convert_host. That is, it is just like Convert_host except in the
+// meaning of the second template parameter.
+
+template<int size, bool big_endian>
+struct Convert
+{
+ typedef typename Valtype_base<size>::Valtype Valtype;
+
+ static inline Valtype
+ convert_host(Valtype v)
+ { return Convert_host<size, big_endian == Endian::host_big_endian>
+ ::convert_host(v); }
+};
+
+// Swap is a template based on size and on whether the target is big
+// endian. It defines the type Valtype and the functions readval and
+// writeval. The functions read and write values of the appropriate
+// size out of buffers, swapping them if necessary.
+
+template<int size, bool big_endian>
+struct Swap
+{
+ typedef typename Valtype_base<size>::Valtype Valtype;
+
+ static inline Valtype
+ readval(const Valtype* wv)
+ { return Convert<size, big_endian>::convert_host(*wv); }
+
+ static inline void
+ writeval(Valtype* wv, Valtype v)
+ { *wv = Convert<size, big_endian>::convert_host(v); }
+};
+
+// Swap_unaligned is a template based on size and on whether the
+// target is big endian. It defines the type Valtype and the
+// functions readval_unaligned and writeval_unaligned. The functions
+// read and write values of the appropriate size out of buffers which
+// may be misaligned.
+
+template<int size, bool big_endian>
+class Swap_unaligned;
+
+template<bool big_endian>
+class Swap_unaligned<8, big_endian>
+{
+public:
+ typedef typename Valtype_base<8>::Valtype Valtype;
+
+ static inline Valtype
+ readval_unaligned(const unsigned char* wv)
+ { return *wv; }
+
+ static inline void
+ writeval_unaligned(unsigned char* wv, Valtype v)
+ { *wv = v; }
+};
+
+template<>
+class Swap_unaligned<16, false>
+{
+public:
+ typedef Valtype_base<16>::Valtype Valtype;
+
+ static inline Valtype
+ readval_unaligned(const unsigned char* wv)
+ {
+ return (wv[1] << 8) | wv[0];
+ }
+
+ static inline void
+ writeval_unaligned(unsigned char* wv, Valtype v)
+ {
+ wv[1] = v >> 8;
+ wv[0] = v;
+ }
+};
+
+template<>
+class Swap_unaligned<16, true>
+{
+public:
+ typedef Valtype_base<16>::Valtype Valtype;
+
+ static inline Valtype
+ readval_unaligned(const unsigned char* wv)
+ {
+ return (wv[0] << 8) | wv[1];
+ }
+
+ static inline void
+ writeval_unaligned(unsigned char* wv, Valtype v)
+ {
+ wv[0] = v >> 8;
+ wv[1] = v;
+ }
+};
+
+template<>
+class Swap_unaligned<32, false>
+{
+public:
+ typedef Valtype_base<32>::Valtype Valtype;
+
+ static inline Valtype
+ readval_unaligned(const unsigned char* wv)
+ {
+ return (wv[3] << 24) | (wv[2] << 16) | (wv[1] << 8) | wv[0];
+ }
+
+ static inline void
+ writeval_unaligned(unsigned char* wv, Valtype v)
+ {
+ wv[3] = v >> 24;
+ wv[2] = v >> 16;
+ wv[1] = v >> 8;
+ wv[0] = v;
+ }
+};
+
+template<>
+class Swap_unaligned<32, true>
+{
+public:
+ typedef Valtype_base<32>::Valtype Valtype;
+
+ static inline Valtype
+ readval_unaligned(const unsigned char* wv)
+ {
+ return (wv[0] << 24) | (wv[1] << 16) | (wv[2] << 8) | wv[3];
+ }
+
+ static inline void
+ writeval_unaligned(unsigned char* wv, Valtype v)
+ {
+ wv[0] = v >> 24;
+ wv[1] = v >> 16;
+ wv[2] = v >> 8;
+ wv[3] = v;
+ }
+};
+
+template<>
+class Swap_unaligned<64, false>
+{
+public:
+ typedef Valtype_base<64>::Valtype Valtype;
+
+ static inline Valtype
+ readval_unaligned(const unsigned char* wv)
+ {
+ return ((static_cast<Valtype>(wv[7]) << 56)
+ | (static_cast<Valtype>(wv[6]) << 48)
+ | (static_cast<Valtype>(wv[5]) << 40)
+ | (static_cast<Valtype>(wv[4]) << 32)
+ | (static_cast<Valtype>(wv[3]) << 24)
+ | (static_cast<Valtype>(wv[2]) << 16)
+ | (static_cast<Valtype>(wv[1]) << 8)
+ | static_cast<Valtype>(wv[0]));
+ }
+
+ static inline void
+ writeval_unaligned(unsigned char* wv, Valtype v)
+ {
+ wv[7] = v >> 56;
+ wv[6] = v >> 48;
+ wv[5] = v >> 40;
+ wv[4] = v >> 32;
+ wv[3] = v >> 24;
+ wv[2] = v >> 16;
+ wv[1] = v >> 8;
+ wv[0] = v;
+ }
+};
+
+template<>
+class Swap_unaligned<64, true>
+{
+public:
+ typedef Valtype_base<64>::Valtype Valtype;
+
+ static inline Valtype
+ readval_unaligned(const unsigned char* wv)
+ {
+ return ((static_cast<Valtype>(wv[0]) << 56)
+ | (static_cast<Valtype>(wv[1]) << 48)
+ | (static_cast<Valtype>(wv[2]) << 40)
+ | (static_cast<Valtype>(wv[3]) << 32)
+ | (static_cast<Valtype>(wv[4]) << 24)
+ | (static_cast<Valtype>(wv[5]) << 16)
+ | (static_cast<Valtype>(wv[6]) << 8)
+ | static_cast<Valtype>(wv[7]));
+ }
+
+ static inline void
+ writeval_unaligned(unsigned char* wv, Valtype v)
+ {
+ wv[7] = v >> 56;
+ wv[6] = v >> 48;
+ wv[5] = v >> 40;
+ wv[4] = v >> 32;
+ wv[3] = v >> 24;
+ wv[2] = v >> 16;
+ wv[1] = v >> 8;
+ wv[0] = v;
+ }
+};
+
+// Standard relocation routines which are used on many targets. Here
+// SIZE and BIG_ENDIAN refer to the target, not the relocation type.
+
+template<int size, bool big_endian>
+class Relocate_functions
+{
+private:
+ // Do a simple relocation with the addend in the section contents.
+ // VALSIZE is the size of the value.
+ template<int valsize>
+ static inline void
+ rel(unsigned char* view, typename Swap<valsize, big_endian>::Valtype value)
+ {
+ typedef typename Swap<valsize, big_endian>::Valtype Valtype;
+ Valtype* wv = reinterpret_cast<Valtype*>(view);
+ Valtype x = Swap<valsize, big_endian>::readval(wv);
+ Swap<valsize, big_endian>::writeval(wv, x + value);
+ }
+
+ // Do a simple PC relative relocation with the addend in the section
+ // contents. VALSIZE is the size of the value.
+ template<int valsize>
+ static inline void
+ pcrel(unsigned char* view, typename Swap<valsize, big_endian>::Valtype value,
+ typename elfcpp::Elf_types<size>::Elf_Addr address)
+ {
+ typedef typename Swap<valsize, big_endian>::Valtype Valtype;
+ Valtype* wv = reinterpret_cast<Valtype*>(view);
+ Valtype x = Swap<valsize, big_endian>::readval(wv);
+ Swap<valsize, big_endian>::writeval(wv, x + value - address);
+ }
+
+ typedef Relocate_functions<size, big_endian> This;
+
+public:
+ // Do a simple 8-bit REL relocation with the addend in the object
+ // file data.
+ static inline void
+ rel8(unsigned char* view, unsigned char value)
+ {
+ This::template rel<8>(view, value);
+ }
+
+ // Do a simple 8-bit PC relative relocation with the addend in the
+ // object file data.
+ static inline void
+ pcrel8(unsigned char* view, unsigned char value,
+ typename elfcpp::Elf_types<size>::Elf_Addr address)
+ {
+ This::template pcrel<8>(view, value, address);
+ }
+
+ // Do a simple 16-bit REL relocation with the addend in the object
+ // file data.
+ static inline void
+ rel16(unsigned char* view, elfcpp::Elf_Half value)
+ {
+ This::template rel<16>(view, value);
+ }
+
+ // Do a simple 32-bit PC relative REL relocation with the addend in
+ // the object file data.
+ static inline void
+ pcrel16(unsigned char* view, elfcpp::Elf_Word value,
+ typename elfcpp::Elf_types<size>::Elf_Addr address)
+ {
+ This::template pcrel<16>(view, value, address);
+ }
+
+ // Do a simple 32-bit REL relocation with the addend in the section
+ // contents.
+ static inline void
+ rel32(unsigned char* view, elfcpp::Elf_Word value)
+ {
+ This::template rel<32>(view, value);
+ }
+
+ // Do a simple 32-bit PC relative REL relocation with the addend in
+ // the section contents.
+ static inline void
+ pcrel32(unsigned char* view, elfcpp::Elf_Word value,
+ typename elfcpp::Elf_types<size>::Elf_Addr address)
+ {
+ This::template pcrel<32>(view, value, address);
+ }
+
+ // Do a simple 64-bit REL relocation with the addend in the section
+ // contents.
+ static inline void
+ rel64(unsigned char* view, elfcpp::Elf_Word value)
+ {
+ This::template rel<64>(view, value);
+ }
+
+ // Do a simple 64-bit PC relative REL relocation with the addend in
+ // the section contents.
+ static inline void
+ pcrel64(unsigned char* view, elfcpp::Elf_Word value,
+ typename elfcpp::Elf_types<size>::Elf_Addr address)
+ {
+ This::template pcrel<64>(view, value, address);
+ }
+};
+
} // End namespace gold.
#endif // !defined(GOLD_RELOC_H)