PowerPC gold, fix 32-bit branch address arithmetic

[platform/upstream/binutils.git] / gold / reloc.h

diff --git a/gold/reloc.h b/gold/reloc.h
index 02f91a4..da14ec1 100644 (file)
--- a/gold/reloc.h
+++ b/gold/reloc.h
@@ -1,6 +1,6 @@
 // reloc.h -- relocate input files for gold   -*- C++ -*-
 
 // 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.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.


@@ -37,7 +37,7 @@ namespace gold
 class General_options;
 class Object;
 class Relobj;
 class General_options;
 class Object;
 class Relobj;

-class Read_relocs_data;
+struct Read_relocs_data;

 class Symbol;
 class Layout;
 class Output_data;
 class Symbol;
 class Layout;
 class Output_data;


@@ -715,6 +715,122 @@ public:
   { This::template pcrela<64>(view, object, psymval, addend, 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.
 // 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 +872,16 @@ class Track_relocs
   int
   advance(off_t offset);
 
   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_;
  private:
   // The contents of the input object's reloc section.
   const unsigned char* prelocs_;