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* arm.cc (has_signed_unsigned_overflow): New function.

Browse Source 
(Arm_relocate_functions::abs8): New function.
	(Target_arm::Scan::local): Handle R_ARM_ABS8.
	(Target_arm::Scan::global): Likewise.
	(Target_arm::relocate::relocate): Likewise.
	(Target_arm::Relocatable_size_for_reloc::get_size_for_reloc):
	Likewise.
This commit is contained in:
Ian Lance Taylor 2009-09-18 00:45:53 +00:00
parent eb4fd9dd88
commit 5e445df679
2 changed files with 76 additions and 0 deletions
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10
gold/ChangeLog
View File

@ -1,3 +1,13 @@
2009-09-17 Viktor Kutuzov <vkutuzov@accesssoftek.com>
* arm.cc (has_signed_unsigned_overflow): New function.
(Arm_relocate_functions::abs8): New function.
(Target_arm::Scan::local): Handle R_ARM_ABS8.
(Target_arm::Scan::global): Likewise.
(Target_arm::relocate::relocate): Likewise.
(Target_arm::Relocatable_size_for_reloc::get_size_for_reloc):
Likewise.
2009-09-08 Cary Coutant <ccoutant@google.com>
* testsuite/Makefile.am (MOSTLYCLEANFILES): Add more generated files.

66
gold/arm.cc
View File

@ -117,6 +117,23 @@ namespace utils
return as_signed > max || as_signed < min;
}
// Detects overflow of an NO_BITS integer stored in a uint32_t when it
// fits in the given number of bits as either a signed or unsigned value.
// For example, has_signed_unsigned_overflow<8> would check
// -128 <= bits <= 255
template<int no_bits>
static inline bool
has_signed_unsigned_overflow(uint32_t bits)
{
gold_assert(no_bits >= 2 && no_bits <= 32);
if (no_bits == 32)
return false;
int32_t max = static_cast<int32_t>((1U << no_bits) - 1);
int32_t min = -(1 << (no_bits - 1));
int32_t as_signed = static_cast<int32_t>(bits);
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.
@ -555,6 +572,26 @@ class Arm_relocate_functions : public Relocate_functions<32, big_endian>
}
public:
// R_ARM_ABS8: S + A
static inline typename This::Status
abs8(unsigned char *view,
const Sized_relobj<32, big_endian>* object,
const Symbol_value<32>* psymval, bool has_thumb_bit)
{
typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype;
typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
Valtype* wv = reinterpret_cast<Valtype*>(view);
Valtype val = elfcpp::Swap<8, big_endian>::readval(wv);
Reltype addend = utils::sign_extend<8>(val);
Reltype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit);
val = utils::bit_select(val, x, 0xffU);
elfcpp::Swap<8, big_endian>::writeval(wv, val);
return (utils::has_signed_unsigned_overflow<8>(x)
? This::STATUS_OVERFLOW
: This::STATUS_OKAY);
}
// R_ARM_ABS32: (S + A) | T
static inline typename This::Status
abs32(unsigned char *view,
@ -1074,6 +1111,15 @@ Target_arm<big_endian>::Scan::local(const General_options&,
case elfcpp::R_ARM_NONE:
break;
case elfcpp::R_ARM_ABS8:
if (parameters->options().output_is_position_independent())
{
// FIXME: Create a dynamic relocation for this location.
gold_error(_("%s: gold bug: need dynamic ABS8 reloc"),
object->name().c_str());
}
break;
case elfcpp::R_ARM_ABS32:
// If building a shared library (or a position-independent
// executable), we need to create a dynamic relocation for
@ -1187,6 +1233,16 @@ Target_arm<big_endian>::Scan::global(const General_options&,
case elfcpp::R_ARM_NONE:
break;
case elfcpp::R_ARM_ABS8:
// Make a dynamic relocation if necessary.
if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
{
// FIXME: Create a dynamic relocation for this location.
gold_error(_("%s: gold bug: need dynamic ABS8 reloc for %s"),
object->name().c_str(), gsym->demangled_name().c_str());
}
break;
case elfcpp::R_ARM_ABS32:
{
// Make a dynamic relocation if necessary.
@ -1595,6 +1651,13 @@ Target_arm<big_endian>::Relocate::relocate(
case elfcpp::R_ARM_NONE:
break;
case elfcpp::R_ARM_ABS8:
if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false,
output_section))
reloc_status = Arm_relocate_functions::abs8(view, object, psymval,
has_thumb_bit);
break;
case elfcpp::R_ARM_ABS32:
if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true,
output_section))
@ -1764,6 +1827,9 @@ Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
case elfcpp::R_ARM_NONE:
return 0;
case elfcpp::R_ARM_ABS8:
return 1;
case elfcpp::R_ARM_ABS32:
case elfcpp::R_ARM_REL32:
case elfcpp::R_ARM_THM_CALL: