diff options
Diffstat (limited to 'binutils-2.22/gold/reloc.h')
-rw-r--r-- | binutils-2.22/gold/reloc.h | 131 |
1 files changed, 129 insertions, 2 deletions
diff --git a/binutils-2.22/gold/reloc.h b/binutils-2.22/gold/reloc.h index 02f91a4..4eca71a 100644 --- a/binutils-2.22/gold/reloc.h +++ b/binutils-2.22/gold/reloc.h @@ -1,6 +1,7 @@ // reloc.h -- relocate input files for gold -*- C++ -*- -// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. +// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012 +// Free Software Foundation, Inc. // Written by Ian Lance Taylor <iant@google.com>. // This file is part of gold. @@ -37,7 +38,7 @@ namespace gold class General_options; class Object; class Relobj; -class Read_relocs_data; +struct Read_relocs_data; class Symbol; class Layout; class Output_data; @@ -715,6 +716,122 @@ public: { 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. @@ -756,6 +873,16 @@ class Track_relocs 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_; |