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authorIan Lance Taylor <ian@airs.com>2012-01-28 01:47:01 +0000
committerIan Lance Taylor <ian@airs.com>2012-01-28 01:47:01 +0000
commitbef2b4345273a0279d89f5b79037eab6279d2883 (patch)
tree4f951e5c81cd397d9ad0fe4550474b2b3595b7e7 /gold/reloc.h
parent687a9c3959a60a93a1846e749ad5f3835e0183ea (diff)
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* reloc.h (Bits): New class with static functions, copied from
namespace utils in arm.cc. * arm.cc (namespace utils): Remove. Rewrite all uses to use Bits instead.
Diffstat (limited to 'gold/reloc.h')
-rw-r--r--gold/reloc.h119
1 files changed, 118 insertions, 1 deletions
diff --git a/gold/reloc.h b/gold/reloc.h
index 02f91a4..973adb0 100644
--- a/gold/reloc.h
+++ b/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.
@@ -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 0 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 0 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.