2009-06-03 Doug Kwan <dougkwan@google.com>
* gold/arm.cc (namespace utils): New. (Target_arm::reloc_is_non_pic): Define new method. (class Arm_relocate_functions): New. (Target_arm::Relocate::relocate): Handle relocation types used by Android.
This commit is contained in:
Doug Kwan
parent
07b82ea5f9
commit
c121c67179
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@ -1,7 +1,31 @@
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2009-06-03 Doug Kwan <dougkwan@google.com>
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* gold/arm.cc (namespace utils): New.
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(Target_arm::reloc_is_non_pic): Define new method.
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(class Arm_relocate_functions): New.
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(Target_arm::Relocate::relocate): Handle relocation types used by
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Android.
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2009-06-03 Ian Lance Taylor <iant@google.com>
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* arm.cc (Target_arm::scan::global): Use || instead of |.
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2009-06-02 Doug Kwan <dougkwan@google.com>
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* gold/arm.cc (Target_arm::Scan::Scan): Initialize
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issued_non_pic_error_.
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(class Target_arm::Scan): Declare new method check_non_pic.
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Define new method symbol_needs_plt_entry.
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Declare new data member issued_non_pic_error_.
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(class Target_arm::Relocate): Declare new method
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should_apply_static_reloc.
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(Target_arm::may_need_copy_reloc): Handle STT_ARM_TFUNC.
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(Target_arm::Scan::check_non_pic): Define new method.
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(Target_arm::Scan::local): Handle a small subset of reloc types used
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by Android.
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(Target_arm::Scan::local): Same.
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(Target_arm::Relocate::should_apply_statci_reloc): Define new method.
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2009-05-31 Mikolaj Zalewski <mikolajz@google.com>
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* incremental.cc (Incremental_inputs::report_command_line): Filter
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496
gold/arm.cc
496
gold/arm.cc
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@ -75,7 +75,6 @@ class Output_data_plt_arm;
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// R_ARM_PREL31
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//
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// Coming soon (pending patches):
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// - Relocation
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// - Defining section symbols __exidx_start and __exidx_stop.
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// - Support interworking.
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// - Mergeing all .ARM.xxx.yyy sections into .ARM.xxx. Currently, they
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@ -88,6 +87,48 @@ class Output_data_plt_arm;
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// - Make PLTs more flexible for different architecture features like
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// Thumb-2 and BE8.
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// Utilities for manipulating integers of up to 32-bits
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namespace utils
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{
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// Sign extend an n-bit unsigned integer stored in an uint32_t into
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// an int32_t. NO_BITS must be between 1 to 32.
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template<int no_bits>
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static inline int32_t
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sign_extend(uint32_t bits)
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{
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gold_assert(no_bits < 1 || no_bits > 32);
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if (no_bits == 32)
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return static_cast<int32_t>(bits);
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uint32_t mask = (~((uint32_t) 0)) >> (32 - no_bits);
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bits &= mask;
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uint32_t top_bit = 1U << (no_bits - 1);
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int32_t as_signed = static_cast<int32_t>(bits);
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return (bits & top_bit) ? as_signed + (-top_bit * 2) : as_signed;
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}
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// Detects overflow of an NO_BITS integer stored in a uint32_t.
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template<int no_bits>
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static inline bool
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has_overflow(uint32_t bits)
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{
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gold_assert(no_bits < 1 || no_bits > 32);
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if (no_bits == 32)
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return false;
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int32_t max = (1 << (no_bits - 1)) - 1;
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int32_t min = -(1 << (no_bits - 1));
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int32_t as_signed = static_cast<int32_t>(bits);
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return as_signed > max || as_signed < min;
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}
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// Select bits from A and B using bits in MASK. For each n in [0..31],
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// the n-th bit in the result is chosen from the n-th bits of A and B.
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// A zero selects A and a one selects B.
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static inline uint32_t
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bit_select(uint32_t a, uint32_t b, uint32_t mask)
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{ return (a & ~mask) | (b & mask); }
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};
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template<bool big_endian>
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class Target_arm : public Sized_target<32, big_endian>
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{
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@ -288,6 +329,24 @@ class Target_arm : public Sized_target<32, big_endian>
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const Symbol_value<32>*,
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unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
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section_size_type);
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// Return whether we want to pass flag NON_PIC_REF for this
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// reloc.
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static inline bool
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reloc_is_non_pic (unsigned int r_type)
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{
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switch (r_type)
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{
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case elfcpp::R_ARM_REL32:
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case elfcpp::R_ARM_THM_CALL:
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case elfcpp::R_ARM_CALL:
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case elfcpp::R_ARM_JUMP24:
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case elfcpp::R_ARM_PREL31:
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return true;
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default:
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return false;
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}
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}
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};
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// A class which returns the size required for a relocation type,
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@ -393,6 +452,254 @@ const Target::Target_info Target_arm<big_endian>::arm_info =
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0x1000 // common_pagesize (overridable by -z common-page-size)
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};
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// Arm relocate functions class
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//
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template<bool big_endian>
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class Arm_relocate_functions : public Relocate_functions<32, big_endian>
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{
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public:
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typedef enum
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{
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STATUS_OKAY, // No error during relocation.
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STATUS_OVERFLOW, // Relocation oveflow.
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STATUS_BAD_RELOC // Relocation cannot be applied.
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} Status;
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private:
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typedef Relocate_functions<32, big_endian> Base;
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typedef Arm_relocate_functions<big_endian> This;
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// Get an symbol value of *PSYMVAL with an ADDEND. This is a wrapper
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// to Symbol_value::value(). If HAS_THUMB_BIT is true, that LSB is used
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// to distinguish ARM and THUMB functions and it is treated specially.
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static inline Symbol_value<32>::Value
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arm_symbol_value (const Sized_relobj<32, big_endian> *object,
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const Symbol_value<32>* psymval,
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Symbol_value<32>::Value addend,
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bool has_thumb_bit)
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{
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typedef Symbol_value<32>::Value Valtype;
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if (has_thumb_bit)
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{
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Valtype raw = psymval->value(object, 0);
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Valtype thumb_bit = raw & 1;
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return ((raw & ~((Valtype) 1)) + addend) | thumb_bit;
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}
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else
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return psymval->value(object, addend);
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}
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// FIXME: This probably only works for Android on ARM v5te. We should
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// following GNU ld for the general case.
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template<unsigned r_type>
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static inline typename This::Status
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arm_branch_common(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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elfcpp::Elf_types<32>::Elf_Addr address,
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bool has_thumb_bit)
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{
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typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
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bool insn_is_b = (((val >> 28) & 0xf) <= 0xe)
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&& ((val & 0x0f000000UL) == 0x0a000000UL);
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bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL;
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bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe)
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&& ((val & 0x0f000000UL) == 0x0b000000UL);
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bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL;
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bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL;
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if (r_type == elfcpp::R_ARM_CALL)
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{
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if (!insn_is_uncond_bl && !insn_is_blx)
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return This::STATUS_BAD_RELOC;
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}
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else if (r_type == elfcpp::R_ARM_JUMP24)
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{
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if (!insn_is_b && !insn_is_cond_bl)
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return This::STATUS_BAD_RELOC;
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}
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else if (r_type == elfcpp::R_ARM_PLT32)
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{
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if (!insn_is_any_branch)
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return This::STATUS_BAD_RELOC;
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}
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else
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gold_unreachable();
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Valtype addend = utils::sign_extend<26>(val << 2);
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Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit)
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- address);
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// If target has thumb bit set, we need to either turn the BL
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// into a BLX (for ARMv5 or above) or generate a stub.
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if (x & 1)
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{
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// Turn BL to BLX.
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if (insn_is_uncond_bl)
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val = (val & 0xffffff) | 0xfa000000 | ((x & 2) << 23);
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else
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return This::STATUS_BAD_RELOC;
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}
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else
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gold_assert(!insn_is_blx);
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val = utils::bit_select(val, (x >> 2), 0xffffffUL);
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elfcpp::Swap<32, big_endian>::writeval(wv, val);
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return (utils::has_overflow<26>(x)
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? This::STATUS_OVERFLOW : This::STATUS_OKAY);
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}
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public:
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// R_ARM_ABS32: (S + A) | T
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static inline typename This::Status
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abs32(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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bool has_thumb_bit)
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{
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typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv);
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Valtype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit);
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elfcpp::Swap<32, big_endian>::writeval(wv, x);
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return This::STATUS_OKAY;
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}
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// R_ARM_REL32: (S + A) | T - P
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static inline typename This::Status
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rel32(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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elfcpp::Elf_types<32>::Elf_Addr address,
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bool has_thumb_bit)
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{
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typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv);
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Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit)
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- address);
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elfcpp::Swap<32, big_endian>::writeval(wv, x);
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return This::STATUS_OKAY;
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}
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// R_ARM_THM_CALL: (S + A) | T - P
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static inline typename This::Status
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thm_call(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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elfcpp::Elf_types<32>::Elf_Addr address,
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bool has_thumb_bit)
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{
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// A thumb call consists of two instructions.
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typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
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typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype hi = elfcpp::Swap<16, big_endian>::readval(wv);
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Valtype lo = elfcpp::Swap<16, big_endian>::readval(wv + 1);
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// Must be a BL instruction. lo == 11111xxxxxxxxxxx.
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gold_assert((lo & 0xf800) == 0xf800);
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Reltype addend = utils::sign_extend<23>(((hi & 0x7ff) << 12)
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| ((lo & 0x7ff) << 1));
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Reltype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit)
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- address);
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// If target has no thumb bit set, we need to either turn the BL
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// into a BLX (for ARMv5 or above) or generate a stub.
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if ((x & 1) == 0)
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{
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// This only works for ARMv5 and above with interworking enabled.
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lo &= 0xefff;
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}
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hi = utils::bit_select(hi, (x >> 12), 0x7ffU);
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lo = utils::bit_select(lo, (x >> 1), 0x7ffU);
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elfcpp::Swap<16, big_endian>::writeval(wv, hi);
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elfcpp::Swap<16, big_endian>::writeval(wv + 1, lo);
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return (utils::has_overflow<23>(x)
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? This::STATUS_OVERFLOW
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: This::STATUS_OKAY);
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}
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// R_ARM_BASE_PREL: B(S) + A - P
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static inline typename This::Status
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base_prel(unsigned char* view,
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elfcpp::Elf_types<32>::Elf_Addr origin,
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elfcpp::Elf_types<32>::Elf_Addr address)
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{
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Base::rel32(view, origin - address);
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return STATUS_OKAY;
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}
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// R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG
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static inline typename This::Status
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got_brel(unsigned char* view,
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typename elfcpp::Swap<32, big_endian>::Valtype got_offset)
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{
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Base::rel32(view, got_offset);
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return This::STATUS_OKAY;
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}
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// R_ARM_PLT32: (S + A) | T - P
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static inline typename This::Status
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plt32(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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elfcpp::Elf_types<32>::Elf_Addr address,
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bool has_thumb_bit)
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{
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return arm_branch_common<elfcpp::R_ARM_PLT32>(view, object, psymval,
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address, has_thumb_bit);
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}
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// R_ARM_CALL: (S + A) | T - P
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static inline typename This::Status
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call(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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elfcpp::Elf_types<32>::Elf_Addr address,
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bool has_thumb_bit)
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{
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return arm_branch_common<elfcpp::R_ARM_CALL>(view, object, psymval,
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address, has_thumb_bit);
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}
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// R_ARM_JUMP24: (S + A) | T - P
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static inline typename This::Status
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jump24(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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elfcpp::Elf_types<32>::Elf_Addr address,
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bool has_thumb_bit)
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{
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return arm_branch_common<elfcpp::R_ARM_JUMP24>(view, object, psymval,
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address, has_thumb_bit);
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}
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// R_ARM_PREL: (S + A) | T - P
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static inline typename This::Status
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prel31(unsigned char *view,
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const Sized_relobj<32, big_endian>* object,
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const Symbol_value<32>* psymval,
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elfcpp::Elf_types<32>::Elf_Addr address,
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bool has_thumb_bit)
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{
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typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
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Valtype* wv = reinterpret_cast<Valtype*>(view);
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Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
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Valtype addend = utils::sign_extend<31>(val);
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Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit)
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- address);
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val = utils::bit_select(val, x, 0x7fffffffU);
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elfcpp::Swap<32, big_endian>::writeval(wv, val);
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return (utils::has_overflow<31>(x) ?
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This::STATUS_OVERFLOW : This::STATUS_OKAY);
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}
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};
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// Get the GOT section, creating it if necessary.
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template<bool big_endian>
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@ -1199,23 +1506,192 @@ Target_arm<big_endian>::Relocate::should_apply_static_reloc(
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template<bool big_endian>
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inline bool
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Target_arm<big_endian>::Relocate::relocate(
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const Relocate_info<32, big_endian>* /* relinfo */,
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Target_arm* /* target */,
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Output_section* /* output_section */,
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size_t /* relnum */,
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const elfcpp::Rel<32, big_endian>& /* rel */,
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const Relocate_info<32, big_endian>* relinfo,
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Target_arm* target,
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Output_section *output_section,
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size_t relnum,
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const elfcpp::Rel<32, big_endian>& rel,
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unsigned int r_type,
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const Sized_symbol<32>* /* gsym */,
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const Symbol_value<32>* /* psymval */,
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unsigned char* /* view */,
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elfcpp::Elf_types<32>::Elf_Addr /* address */,
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const Sized_symbol<32>* gsym,
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const Symbol_value<32>* psymval,
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unsigned char* view,
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elfcpp::Elf_types<32>::Elf_Addr address,
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section_size_type /* view_size */ )
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{
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typedef Arm_relocate_functions<big_endian> Arm_relocate_functions;
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r_type = get_real_reloc_type(r_type);
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// If this the symbol may be a Thumb function, set thumb bit to 1.
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bool has_thumb_bit = ((gsym != NULL)
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&& (gsym->type() == elfcpp::STT_FUNC
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|| gsym->type() == elfcpp::STT_ARM_TFUNC));
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// Pick the value to use for symbols defined in shared objects.
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Symbol_value<32> symval;
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if (gsym != NULL
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&& gsym->use_plt_offset(reloc_is_non_pic(r_type)))
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{
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symval.set_output_value(target->plt_section()->address()
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+ gsym->plt_offset());
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psymval = &symval;
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has_thumb_bit = 0;
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}
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|
||||
const Sized_relobj<32, big_endian>* object = relinfo->object;
|
||||
|
||||
// Get the GOT offset if needed.
|
||||
// The GOT pointer points to the end of the GOT section.
|
||||
// We need to subtract the size of the GOT section to get
|
||||
// the actual offset to use in the relocation.
|
||||
bool have_got_offset = false;
|
||||
unsigned int got_offset = 0;
|
||||
switch (r_type)
|
||||
{
|
||||
case elfcpp::R_ARM_GOT_BREL:
|
||||
if (gsym != NULL)
|
||||
{
|
||||
gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
|
||||
got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
|
||||
- target->got_size());
|
||||
}
|
||||
else
|
||||
{
|
||||
unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
|
||||
gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
|
||||
got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
|
||||
- target->got_size());
|
||||
}
|
||||
have_got_offset = true;
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
typename Arm_relocate_functions::Status reloc_status =
|
||||
Arm_relocate_functions::STATUS_OKAY;
|
||||
switch (r_type)
|
||||
{
|
||||
case elfcpp::R_ARM_NONE:
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_ABS32:
|
||||
if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true,
|
||||
output_section))
|
||||
reloc_status = Arm_relocate_functions::abs32(view, object, psymval,
|
||||
has_thumb_bit);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_REL32:
|
||||
reloc_status = Arm_relocate_functions::rel32(view, object, psymval,
|
||||
address, has_thumb_bit);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_THM_CALL:
|
||||
reloc_status = Arm_relocate_functions::thm_call(view, object, psymval,
|
||||
address, has_thumb_bit);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_GOTOFF32:
|
||||
{
|
||||
elfcpp::Elf_types<32>::Elf_Addr got_origin;
|
||||
got_origin = target->got_plt_section()->address();
|
||||
reloc_status = Arm_relocate_functions::rel32(view, object, psymval,
|
||||
got_origin, has_thumb_bit);
|
||||
}
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_BASE_PREL:
|
||||
{
|
||||
uint32_t origin;
|
||||
// Get the addressing origin of the output segment defining the
|
||||
// symbol gsym (AAELF 4.6.1.2 Relocation types)
|
||||
gold_assert(gsym != NULL);
|
||||
if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT)
|
||||
origin = gsym->output_segment()->vaddr();
|
||||
else if (gsym->source () == Symbol::IN_OUTPUT_DATA)
|
||||
origin = gsym->output_data()->address();
|
||||
else
|
||||
{
|
||||
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
|
||||
_("cannot find origin of R_ARM_BASE_PREL"));
|
||||
return true;
|
||||
}
|
||||
reloc_status = Arm_relocate_functions::base_prel(view, origin, address);
|
||||
}
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_GOT_BREL:
|
||||
gold_assert(have_got_offset);
|
||||
reloc_status = Arm_relocate_functions::got_brel(view, got_offset);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_PLT32:
|
||||
gold_assert(gsym == NULL
|
||||
|| gsym->has_plt_offset()
|
||||
|| gsym->final_value_is_known()
|
||||
|| (gsym->is_defined()
|
||||
&& !gsym->is_from_dynobj()
|
||||
&& !gsym->is_preemptible()));
|
||||
reloc_status = Arm_relocate_functions::plt32(view, object, psymval,
|
||||
address, has_thumb_bit);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_CALL:
|
||||
reloc_status = Arm_relocate_functions::call(view, object, psymval,
|
||||
address, has_thumb_bit);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_JUMP24:
|
||||
reloc_status = Arm_relocate_functions::jump24(view, object, psymval,
|
||||
address, has_thumb_bit);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_PREL31:
|
||||
reloc_status = Arm_relocate_functions::prel31(view, object, psymval,
|
||||
address, has_thumb_bit);
|
||||
break;
|
||||
|
||||
case elfcpp::R_ARM_TARGET1:
|
||||
// This should have been mapped to another type already.
|
||||
// Fall through.
|
||||
case elfcpp::R_ARM_COPY:
|
||||
case elfcpp::R_ARM_GLOB_DAT:
|
||||
case elfcpp::R_ARM_JUMP_SLOT:
|
||||
case elfcpp::R_ARM_RELATIVE:
|
||||
// These are relocations which should only be seen by the
|
||||
// dynamic linker, and should never be seen here.
|
||||
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
|
||||
_("unexpected reloc %u in object file"),
|
||||
r_type);
|
||||
break;
|
||||
|
||||
default:
|
||||
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
|
||||
_("unsupported reloc %u"),
|
||||
r_type);
|
||||
break;
|
||||
}
|
||||
|
||||
// Report any errors.
|
||||
switch (reloc_status)
|
||||
{
|
||||
case Arm_relocate_functions::STATUS_OKAY:
|
||||
break;
|
||||
case Arm_relocate_functions::STATUS_OVERFLOW:
|
||||
gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
|
||||
_("relocation overflow in relocation %u"),
|
||||
r_type);
|
||||
break;
|
||||
case Arm_relocate_functions::STATUS_BAD_RELOC:
|
||||
gold_error_at_location(
|
||||
relinfo,
|
||||
relnum,
|
||||
rel.get_r_offset(),
|
||||
_("unexpected opcode while processing relocation %u"),
|
||||
r_type);
|
||||
break;
|
||||
default:
|
||||
gold_unreachable();
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue