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authorIan Lance Taylor <ian@airs.com>2009-09-18 00:45:53 +0000
committerIan Lance Taylor <ian@airs.com>2009-09-18 00:45:53 +0000
commit5e445df679225ddbcd707c65ebb1c05af08536fc (patch)
tree7283197a7726757184987a298669d1a2cff95e68 /gold/arm.cc
parenteb4fd9dd881d958e72120ad58c0d2de0d3b1a91e (diff)
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* 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.
Diffstat (limited to 'gold/arm.cc')
-rw-r--r--gold/arm.cc66
1 files changed, 66 insertions, 0 deletions
diff --git a/gold/arm.cc b/gold/arm.cc
index 0e4a3eb..6fc71a7 100644
--- a/gold/arm.cc
+++ b/gold/arm.cc
@@ -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: