// reloc.h -- relocate input files for gold -*- C++ -*-
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright (C) 2006-2014 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
class General_options;
class Object;
class Relobj;
-class Read_relocs_data;
+struct Read_relocs_data;
class Symbol;
class Layout;
class Output_data;
class Sized_symbol;
template<int size, bool big_endian>
-class Sized_relobj;
+class Sized_relobj_file;
template<int size>
class Symbol_value;
RELOC_ADJUST_FOR_SECTION_2,
RELOC_ADJUST_FOR_SECTION_4,
RELOC_ADJUST_FOR_SECTION_8,
+ // Like RELOC_ADJUST_FOR_SECTION_4 but for unaligned relocs.
+ RELOC_ADJUST_FOR_SECTION_4_UNALIGNED,
// Discard the input reloc--process it completely when relocating
// the data section contents.
RELOC_DISCARD,
elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value);
}
+ // Like the above but for relocs at unaligned addresses.
+ template<int valsize>
+ static inline void
+ rel_unaligned(unsigned char* view,
+ typename elfcpp::Swap<valsize, big_endian>::Valtype value)
+ {
+ typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
+ Valtype;
+ Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view);
+ elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x + value);
+ }
+
// Do a simple relocation using a Symbol_value with the addend in
// the section contents. VALSIZE is the size of the value to
// relocate.
template<int valsize>
static inline void
rel(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval)
{
typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
elfcpp::Swap<valsize, big_endian>::writeval(wv, x);
}
+ // Like the above but for relocs at unaligned addresses.
+ template<int valsize>
+ static inline void
+ rel_unaligned(unsigned char* view,
+ const Sized_relobj_file<size, big_endian>* object,
+ const Symbol_value<size>* psymval)
+ {
+ typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
+ Valtype;
+ Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view);
+ x = psymval->value(object, x);
+ elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x);
+ }
+
// Do a simple relocation with the addend in the relocation.
// VALSIZE is the size of the value.
template<int valsize>
template<int valsize>
static inline void
rela(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
typename elfcpp::Swap<valsize, big_endian>::Valtype addend)
{
elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address);
}
+ // Like the above but for relocs at unaligned addresses.
+ template<int valsize>
+ static inline void
+ pcrel_unaligned(unsigned char* view,
+ typename elfcpp::Swap<valsize, big_endian>::Valtype value,
+ typename elfcpp::Elf_types<size>::Elf_Addr address)
+ {
+ typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
+ Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view);
+ elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
+ x + value - address);
+ }
+
// Do a simple PC relative relocation with a Symbol_value with the
// addend in the section contents. VALSIZE is the size of the
// value.
template<int valsize>
static inline void
pcrel(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{
template<int valsize>
static inline void
pcrela(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
typename elfcpp::Swap<valsize, big_endian>::Valtype addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
static inline void
rel8(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval)
{ This::template rel<8>(view, object, psymval); }
static inline void
rela8(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
unsigned char addend)
{ This::template rela<8>(view, object, psymval, addend); }
static inline void
pcrel8(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This::template pcrel<8>(view, object, psymval, address); }
static inline void
pcrela8(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
unsigned char addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
static inline void
rel16(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval)
{ This::template rel<16>(view, object, psymval); }
static inline void
rela16(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
elfcpp::Elf_Half addend)
{ This::template rela<16>(view, object, psymval, addend); }
static inline void
pcrel16(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This::template pcrel<16>(view, object, psymval, address); }
static inline void
pcrela16(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
elfcpp::Elf_Half addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
rel32(unsigned char* view, elfcpp::Elf_Word value)
{ This::template rel<32>(view, value); }
+ // Like above but for relocs at unaligned addresses.
+ static inline void
+ rel32_unaligned(unsigned char* view, elfcpp::Elf_Word value)
+ { This::template rel_unaligned<32>(view, value); }
+
static inline void
rel32(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval)
{ This::template rel<32>(view, object, psymval); }
+ // Like above but for relocs at unaligned addresses.
+ static inline void
+ rel32_unaligned(unsigned char* view,
+ const Sized_relobj_file<size, big_endian>* object,
+ const Symbol_value<size>* psymval)
+ { This::template rel_unaligned<32>(view, object, psymval); }
+
// Do an 32-bit RELA relocation with the addend in the relocation.
static inline void
rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend)
static inline void
rela32(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
elfcpp::Elf_Word addend)
{ This::template rela<32>(view, object, psymval, addend); }
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This::template pcrel<32>(view, value, address); }
+ // Unaligned version of the above.
+ static inline void
+ pcrel32_unaligned(unsigned char* view, elfcpp::Elf_Word value,
+ typename elfcpp::Elf_types<size>::Elf_Addr address)
+ { This::template pcrel_unaligned<32>(view, value, address); }
+
static inline void
pcrel32(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This::template pcrel<32>(view, object, psymval, address); }
static inline void
pcrela32(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
elfcpp::Elf_Word addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
static inline void
rel64(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval)
{ This::template rel<64>(view, object, psymval); }
static inline void
rela64(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
elfcpp::Elf_Xword addend)
{ This::template rela<64>(view, object, psymval, addend); }
static inline void
pcrel64(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This::template pcrel<64>(view, object, psymval, address); }
static inline void
pcrela64(unsigned char* view,
- const Sized_relobj<size, big_endian>* object,
+ const Sized_relobj_file<size, big_endian>* object,
const Symbol_value<size>* psymval,
elfcpp::Elf_Xword addend,
typename elfcpp::Elf_types<size>::Elf_Addr address)
{ This::template pcrela<64>(view, object, psymval, addend, address); }
};
+// Integer manipulation functions used by various targets when
+// performing relocations.
+
+template<int bits>
+class Bits
+{
+ public:
+ // Sign extend an n-bit unsigned integer stored in a uint32_t into
+ // an int32_t. BITS must be between 1 and 32.
+ static inline int32_t
+ sign_extend32(uint32_t val)
+ {
+ gold_assert(bits > 0 && bits <= 32);
+ if (bits == 32)
+ return static_cast<int32_t>(val);
+ uint32_t mask = (~static_cast<uint32_t>(0)) >> (32 - bits);
+ val &= mask;
+ uint32_t top_bit = 1U << (bits - 1);
+ int32_t as_signed = static_cast<int32_t>(val);
+ if ((val & top_bit) != 0)
+ as_signed -= static_cast<int32_t>(top_bit * 2);
+ return as_signed;
+ }
+
+ // Return true if VAL (stored in a uint32_t) has overflowed a signed
+ // value with BITS bits.
+ static inline bool
+ has_overflow32(uint32_t val)
+ {
+ gold_assert(bits > 0 && bits <= 32);
+ if (bits == 32)
+ return false;
+ int32_t max = (1 << (bits - 1)) - 1;
+ int32_t min = -(1 << (bits - 1));
+ int32_t as_signed = static_cast<int32_t>(val);
+ return as_signed > max || as_signed < min;
+ }
+
+ // Return true if VAL (stored in a uint32_t) has overflowed both a
+ // signed and an unsigned value. E.g.,
+ // Bits<8>::has_signed_unsigned_overflow32 would check -128 <= VAL <
+ // 255.
+ static inline bool
+ has_signed_unsigned_overflow32(uint32_t val)
+ {
+ gold_assert(bits > 0 && bits <= 32);
+ if (bits == 32)
+ return false;
+ int32_t max = static_cast<int32_t>((1U << bits) - 1);
+ int32_t min = -(1 << (bits - 1));
+ int32_t as_signed = static_cast<int32_t>(val);
+ return as_signed > max || as_signed < min;
+ }
+
+ // Select bits from A and B using bits in MASK. For each n in
+ // [0..31], the n-th bit in the result is chosen from the n-th bits
+ // of A and B. A zero selects A and a one selects B.
+ static inline uint32_t
+ bit_select32(uint32_t a, uint32_t b, uint32_t mask)
+ { return (a & ~mask) | (b & mask); }
+
+ // Sign extend an n-bit unsigned integer stored in a uint64_t into
+ // an int64_t. BITS must be between 1 and 64.
+ static inline int64_t
+ sign_extend(uint64_t val)
+ {
+ gold_assert(bits > 0 && bits <= 64);
+ if (bits == 64)
+ return static_cast<int64_t>(val);
+ uint64_t mask = (~static_cast<uint64_t>(0)) >> (64 - bits);
+ val &= mask;
+ uint64_t top_bit = static_cast<uint64_t>(1) << (bits - 1);
+ int64_t as_signed = static_cast<int64_t>(val);
+ if ((val & top_bit) != 0)
+ as_signed -= static_cast<int64_t>(top_bit * 2);
+ return as_signed;
+ }
+
+ // Return true if VAL (stored in a uint64_t) has overflowed a signed
+ // value with BITS bits.
+ static inline bool
+ has_overflow(uint64_t val)
+ {
+ gold_assert(bits > 0 && bits <= 64);
+ if (bits == 64)
+ return false;
+ int64_t max = (static_cast<int64_t>(1) << (bits - 1)) - 1;
+ int64_t min = -(static_cast<int64_t>(1) << (bits - 1));
+ int64_t as_signed = static_cast<int64_t>(val);
+ return as_signed > max || as_signed < min;
+ }
+
+ // Return true if VAL (stored in a uint64_t) has overflowed both a
+ // signed and an unsigned value. E.g.,
+ // Bits<8>::has_signed_unsigned_overflow would check -128 <= VAL <
+ // 255.
+ static inline bool
+ has_signed_unsigned_overflow64(uint64_t val)
+ {
+ gold_assert(bits > 0 && bits <= 64);
+ if (bits == 64)
+ return false;
+ int64_t max = static_cast<int64_t>((static_cast<uint64_t>(1) << bits) - 1);
+ int64_t min = -(static_cast<int64_t>(1) << (bits - 1));
+ int64_t as_signed = static_cast<int64_t>(val);
+ return as_signed > max || as_signed < min;
+ }
+
+ // Select bits from A and B using bits in MASK. For each n in
+ // [0..31], the n-th bit in the result is chosen from the n-th bits
+ // of A and B. A zero selects A and a one selects B.
+ static inline uint64_t
+ bit_select64(uint64_t a, uint64_t b, uint64_t mask)
+ { return (a & ~mask) | (b & mask); }
+};
+
// Track relocations while reading a section. This lets you ask for
// the relocation at a certain offset, and see how relocs occur
// between points of interest.
unsigned int reloc_type);
// Return the offset in the data section to which the next reloc
- // applies. THis returns -1 if there is no next reloc.
+ // applies. This returns -1 if there is no next reloc.
off_t
next_offset() const;
unsigned int
next_symndx() const;
+ // Return the addend of the next reloc. This returns 0 if there is
+ // no next reloc.
+ uint64_t
+ next_addend() const;
+
// Advance to OFFSET within the data section, and return the number
// of relocs which would be skipped.
int
advance(off_t offset);
+ // Checkpoint the current position in the reloc section.
+ section_size_type
+ checkpoint() const
+ { return this->pos_; }
+
+ // Reset the position to CHECKPOINT.
+ void
+ reset(section_size_type checkpoint)
+ { this->pos_ = checkpoint; }
+
private:
// The contents of the input object's reloc section.
const unsigned char* prelocs_;
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