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authorHan Shen <shenhan@google.com>2015-06-10 16:50:22 (GMT)
committerDan Albert <danalbert@google.com>2015-07-29 17:51:12 (GMT)
commitd3279854f8115323e4e74d4865884a0b7d2c0f44 (patch)
tree5425ba01c7ab9f8c33e1b51b73580e8b155febd8
parent7e80b87f7ff08c7c13f38d76a953b0cd753403aa (diff)
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Patch for erratum-843419 (2 of 2 - fix erratum occurrences).
Now fixing for 843419 is fully functional. The first part of the erratum fix CL is here - https://sourceware.org/ml/binutils/2015-04/msg00229.html gold/ChangeLog 2015-06-10 Han Shen <shenhan@google.com> * aarch64.cc(global enum): New constants representing stub types. (Stub_template): New POD struct. (Stub_template_repertoire): New class. (Stub_base): New class. (Erratum_stub): New class. (Reloc_stub): Refactored to be a subclass of Stub_base. (Reloc_stub::Stub_type): Removed. (Reloc_stub::offset): Moved to Stub_base. (Reloc_stub::set_offset): Moved to Stub_base. (Reloc_stub::destination_address): Moved to Stub_base. (Reloc_stub::set_destination_address): Moved to Stub_base. (Reloc_stub::reset_destination_address): Moved to Stub_base. (Reloc_stub::stub_type): Renamed and moved to Stub_base. (Reloc_stub::stub_size): Renamed and moved to Stub_base. (Reloc_stub::stub_insns): Renamed and moved to Stub_base. (Reloc_stub::write): Moved to Stub_base. (Reloc_stub::invalid_offset): Moved to Stub_base. (Reloc_stub::invalid_address): Moved to Stub_base. (Reloc_stub::stub_type_): Renamed and moved to Stub_base. (Reloc_stub::stub_insns_): Moved to Stub_base. (Reloc_stub::offset_): Moved to Stub_base. (Reloc_stub::destination_address_): Moved to Stub_base. (Stub_table::The_aarch64_relobj): New typedef. (Stub_table::The_erratum_stub): New typedef. (Stub_table::The_erratum_stub_less): New typedef. (Stub_table::The_erratum_stub_set): New typedef. (Stub_table::The_erratum_stub_set_iter): New typedef. (Stub_table::empty): Added emptiness testing for erratum stubs. (Stub_table::add_erratum_stub): New method to add an erratum stub. (Stub_table::find_erratum_stub): New method. (Stub_table::find_erratum_stubs_for_input_section): New method. (Stub_table::erratum_stub_address): New method. (Stub_table::update_date_size_changed_p): Modified to handle erratum stubs. (Stub_table::do_addralign): Modified to handle erratum stubs. (Stub_table::erratum_stubs_): New member. (Stub_table::erratum_stub_size_): New member. (Stub_table::relocate_stubs): Modified to handle erratum stubs. (Stub_table::do_write): Modified to handle erratum stubs. (AArch64_relobj::The_erratum_stub): New typedef. (AArch64_relobj::Erratum_stub_set_iter): New typedef. (AArch64_relobj::fix_errata): New method. (Target_aarch64::The_reloc_stub_type): Removed. (Target_aarch64::The_erratum_stub): New typede. (AArch64_relocate_functions::construct_b): New method. Change-Id: I37ccc9fbefd5559dae700637e119a2a885cf3eb9 (cherry picked from commit a48d0c12f893a922692492829f04189d9f216172)
-rw-r--r--binutils-2.25/gold/ChangeLog53
-rw-r--r--binutils-2.25/gold/aarch64.cc833
2 files changed, 710 insertions, 176 deletions
diff --git a/binutils-2.25/gold/ChangeLog b/binutils-2.25/gold/ChangeLog
index 6ce6110..41509d3 100644
--- a/binutils-2.25/gold/ChangeLog
+++ b/binutils-2.25/gold/ChangeLog
@@ -2,6 +2,59 @@
* resolve.cc disable the warning of a hidden symbol matches a
reference to be resolved
+2015-06-10 Han Shen <shenhan@google.com>
+ Patch for erratum-843419 (2 of 2 - fix erratum occurrences).
+
+ Now fixing for 843419 is fully functional.
+
+ The first part of the erratum fix CL is here -
+ https://sourceware.org/ml/binutils/2015-04/msg00229.html
+
+ * aarch64.cc(global enum): New constants representing stub types.
+ (Stub_template): New POD struct.
+ (Stub_template_repertoire): New class.
+ (Stub_base): New class.
+ (Erratum_stub): New class.
+ (Reloc_stub): Refactored to be a subclass of Stub_base.
+ (Reloc_stub::Stub_type): Removed.
+ (Reloc_stub::offset): Moved to Stub_base.
+ (Reloc_stub::set_offset): Moved to Stub_base.
+ (Reloc_stub::destination_address): Moved to Stub_base.
+ (Reloc_stub::set_destination_address): Moved to Stub_base.
+ (Reloc_stub::reset_destination_address): Moved to Stub_base.
+ (Reloc_stub::stub_type): Renamed and moved to Stub_base.
+ (Reloc_stub::stub_size): Renamed and moved to Stub_base.
+ (Reloc_stub::stub_insns): Renamed and moved to Stub_base.
+ (Reloc_stub::write): Moved to Stub_base.
+ (Reloc_stub::invalid_offset): Moved to Stub_base.
+ (Reloc_stub::invalid_address): Moved to Stub_base.
+ (Reloc_stub::stub_type_): Renamed and moved to Stub_base.
+ (Reloc_stub::stub_insns_): Moved to Stub_base.
+ (Reloc_stub::offset_): Moved to Stub_base.
+ (Reloc_stub::destination_address_): Moved to Stub_base.
+ (Stub_table::The_aarch64_relobj): New typedef.
+ (Stub_table::The_erratum_stub): New typedef.
+ (Stub_table::The_erratum_stub_less): New typedef.
+ (Stub_table::The_erratum_stub_set): New typedef.
+ (Stub_table::The_erratum_stub_set_iter): New typedef.
+ (Stub_table::empty): Added emptiness testing for erratum stubs.
+ (Stub_table::add_erratum_stub): New method to add an erratum stub.
+ (Stub_table::find_erratum_stub): New method.
+ (Stub_table::find_erratum_stubs_for_input_section): New method.
+ (Stub_table::erratum_stub_address): New method.
+ (Stub_table::update_date_size_changed_p): Modified to handle erratum stubs.
+ (Stub_table::do_addralign): Modified to handle erratum stubs.
+ (Stub_table::erratum_stubs_): New member.
+ (Stub_table::erratum_stub_size_): New member.
+ (Stub_table::relocate_stubs): Modified to handle erratum stubs.
+ (Stub_table::do_write): Modified to handle erratum stubs.
+ (AArch64_relobj::The_erratum_stub): New typedef.
+ (AArch64_relobj::Erratum_stub_set_iter): New typedef.
+ (AArch64_relobj::fix_errata): New method.
+ (Target_aarch64::The_reloc_stub_type): Removed.
+ (Target_aarch64::The_erratum_stub): New typede.
+ (AArch64_relocate_functions::construct_b): New method.
+
2015-04-27 Han Shen <shenhan@google.com>
* options.h (--fix-cortex-a53-843419): Rename option.
diff --git a/binutils-2.25/gold/aarch64.cc b/binutils-2.25/gold/aarch64.cc
index 7498273..3f8d572 100644
--- a/binutils-2.25/gold/aarch64.cc
+++ b/binutils-2.25/gold/aarch64.cc
@@ -24,6 +24,7 @@
#include <cstring>
#include <map>
+#include <set>
#include "elfcpp.h"
#include "dwarf.h"
@@ -576,91 +577,177 @@ template<int size, bool big_endian>
class AArch64_output_section;
-// Reloc stub class.
-
template<int size, bool big_endian>
-class Reloc_stub
+class AArch64_relobj;
+
+
+// Stub type enum constants.
+
+enum
{
- public:
- typedef Reloc_stub<size, big_endian> This;
- typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
+ ST_NONE = 0,
- // Do not change the value of the enums, they are used to index into
- // stub_insns array.
- typedef enum
- {
- ST_NONE = 0,
+ // Using adrp/add pair, 4 insns (including alignment) without mem access,
+ // the fastest stub. This has a limited jump distance, which is tested by
+ // aarch64_valid_for_adrp_p.
+ ST_ADRP_BRANCH = 1,
- // Using adrp/add pair, 4 insns (including alignment) without mem access,
- // the fastest stub. This has a limited jump distance, which is tested by
- // aarch64_valid_for_adrp_p.
- ST_ADRP_BRANCH = 1,
+ // Using ldr-absolute-address/br-register, 4 insns with 1 mem access,
+ // unlimited in jump distance.
+ ST_LONG_BRANCH_ABS = 2,
- // Using ldr-absolute-address/br-register, 4 insns with 1 mem access,
- // unlimited in jump distance.
- ST_LONG_BRANCH_ABS = 2,
+ // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1
+ // mem access, slowest one. Only used in position independent executables.
+ ST_LONG_BRANCH_PCREL = 3,
- // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1 mem
- // access, slowest one. Only used in position independent executables.
- ST_LONG_BRANCH_PCREL = 3,
+ // Stub for erratum 843419 handling.
+ ST_E_843419 = 4,
- } Stub_type;
+ // Number of total stub types.
+ ST_NUMBER = 5
+};
- // Branch range. This is used to calculate the section group size, as well as
- // determine whether a stub is needed.
- static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2;
- static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2);
- // Constant used to determine if an offset fits in the adrp instruction
- // encoding.
- static const int MAX_ADRP_IMM = (1 << 20) - 1;
- static const int MIN_ADRP_IMM = -(1 << 20);
+// Struct that wraps insns for a particular stub. All stub templates are
+// created/initialized as constants by Stub_template_repertoire.
- static const int BYTES_PER_INSN = 4;
- static const int STUB_ADDR_ALIGN = 4;
+template<bool big_endian>
+struct Stub_template
+{
+ const typename AArch64_insn_utilities<big_endian>::Insntype* insns;
+ const int insn_num;
+};
- // Determine whether the offset fits in the jump/branch instruction.
- static bool
- aarch64_valid_branch_offset_p(int64_t offset)
- { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; }
- // Determine whether the offset fits in the adrp immediate field.
- static bool
- aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest)
+// Simple singleton class that creates/initializes/stores all types of stub
+// templates.
+
+template<bool big_endian>
+class Stub_template_repertoire
+{
+public:
+ typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
+
+ // Single static method to get stub template for a given stub type.
+ static const Stub_template<big_endian>*
+ get_stub_template(int type)
{
- typedef AArch64_relocate_functions<size, big_endian> Reloc;
- int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12;
- return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM;
+ static Stub_template_repertoire<big_endian> singleton;
+ return singleton.stub_templates_[type];
}
- // Determine the stub type for a certain relocation or ST_NONE, if no stub is
- // needed.
- static Stub_type
- stub_type_for_reloc(unsigned int r_type, AArch64_address address,
- AArch64_address target);
-
- Reloc_stub(Stub_type stub_type)
- : stub_type_(stub_type), offset_(invalid_offset),
- destination_address_(invalid_address)
+private:
+ // Constructor - creates/initializes all stub templates.
+ Stub_template_repertoire();
+ ~Stub_template_repertoire()
{ }
- ~Reloc_stub()
- { }
+ // Disallowing copy ctor and copy assignment operator.
+ Stub_template_repertoire(Stub_template_repertoire&);
+ Stub_template_repertoire& operator=(Stub_template_repertoire&);
- // Return offset of code stub from beginning of its containing stub table.
- section_offset_type
- offset() const
+ // Data that stores all insn templates.
+ const Stub_template<big_endian>* stub_templates_[ST_NUMBER];
+}; // End of "class Stub_template_repertoire".
+
+
+// Constructor - creates/initilizes all stub templates.
+
+template<bool big_endian>
+Stub_template_repertoire<big_endian>::Stub_template_repertoire()
+{
+ // Insn array definitions.
+ const static Insntype ST_NONE_INSNS[] = {};
+
+ const static Insntype ST_ADRP_BRANCH_INSNS[] =
+ {
+ 0x90000010, /* adrp ip0, X */
+ /* ADR_PREL_PG_HI21(X) */
+ 0x91000210, /* add ip0, ip0, :lo12:X */
+ /* ADD_ABS_LO12_NC(X) */
+ 0xd61f0200, /* br ip0 */
+ 0x00000000, /* alignment padding */
+ };
+
+ const static Insntype ST_LONG_BRANCH_ABS_INSNS[] =
+ {
+ 0x58000050, /* ldr ip0, 0x8 */
+ 0xd61f0200, /* br ip0 */
+ 0x00000000, /* address field */
+ 0x00000000, /* address fields */
+ };
+
+ const static Insntype ST_LONG_BRANCH_PCREL_INSNS[] =
+ {
+ 0x58000090, /* ldr ip0, 0x10 */
+ 0x10000011, /* adr ip1, #0 */
+ 0x8b110210, /* add ip0, ip0, ip1 */
+ 0xd61f0200, /* br ip0 */
+ 0x00000000, /* address field */
+ 0x00000000, /* address field */
+ 0x00000000, /* alignment padding */
+ 0x00000000, /* alignment padding */
+ };
+
+ const static Insntype ST_E_843419_INSNS[] =
+ {
+ 0x00000000, /* Placeholder for erratum insn. */
+ 0x14000000, /* b <label> */
+ };
+
+#define install_insn_template(T) \
+ const static Stub_template<big_endian> template_##T = { \
+ T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \
+ this->stub_templates_[T] = &template_##T
+
+ install_insn_template(ST_NONE);
+ install_insn_template(ST_ADRP_BRANCH);
+ install_insn_template(ST_LONG_BRANCH_ABS);
+ install_insn_template(ST_LONG_BRANCH_PCREL);
+ install_insn_template(ST_E_843419);
+
+#undef install_insn_template
+}
+
+
+// Base class for stubs.
+
+template<int size, bool big_endian>
+class Stub_base
+{
+public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
+ typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
+
+ static const AArch64_address invalid_address =
+ static_cast<AArch64_address>(-1);
+
+ static const section_offset_type invalid_offset =
+ static_cast<section_offset_type>(-1);
+
+ Stub_base(int type)
+ : destination_address_(invalid_address),
+ offset_(invalid_offset),
+ type_(type)
+ {}
+
+ ~Stub_base()
+ {}
+
+ // Get stub type.
+ int
+ type() const
+ { return this->type_; }
+
+ // Get stub template that provides stub insn information.
+ const Stub_template<big_endian>*
+ stub_template() const
{
- gold_assert(this->offset_ != invalid_offset);
- return this->offset_;
+ return Stub_template_repertoire<big_endian>::
+ get_stub_template(this->type());
}
- // Set offset of code stub from beginning of its containing stub table.
- void
- set_offset(section_offset_type offset)
- { this->offset_ = offset; }
-
- // Return destination address.
+ // Get destination address.
AArch64_address
destination_address() const
{
@@ -681,38 +768,254 @@ class Reloc_stub
reset_destination_address()
{ this->destination_address_ = this->invalid_address; }
- // Return the stub type.
- Stub_type
- stub_type() const
- { return stub_type_; }
+ // Get offset of code stub. For Reloc_stub, it is the offset from the
+ // beginning of its containing stub table; for Erratum_stub, it is the offset
+ // from the end of reloc_stubs.
+ section_offset_type
+ offset() const
+ {
+ gold_assert(this->offset_ != this->invalid_offset);
+ return this->offset_;
+ }
- // Return the stub size.
- uint32_t
- stub_size() const
- { return this->stub_insn_number() * BYTES_PER_INSN; }
+ // Set stub offset.
+ void
+ set_offset(section_offset_type offset)
+ { this->offset_ = offset; }
- // Return the instruction number of this stub instance.
- int
- stub_insn_number() const
- { return stub_insns_[this->stub_type_][0]; }
+ // Return the stub insn.
+ const Insntype*
+ insns() const
+ { return this->stub_template()->insns; }
- // Note the first "insn" is the number of total insns in this array.
- const uint32_t*
- stub_insns() const
- { return stub_insns_[this->stub_type_]; }
+ // Return num of stub insns.
+ unsigned int
+ insn_num() const
+ { return this->stub_template()->insn_num; }
+
+ // Get size of the stub.
+ int
+ stub_size() const
+ {
+ return this->insn_num() *
+ AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
+ }
// Write stub to output file.
void
write(unsigned char* view, section_size_type view_size)
{ this->do_write(view, view_size); }
+protected:
+ // Abstract method to be implemented by sub-classes.
+ virtual void
+ do_write(unsigned char*, section_size_type) = 0;
+
+private:
+ // The last insn of a stub is a jump to destination insn. This field records
+ // the destination address.
+ AArch64_address destination_address_;
+ // The stub offset. Note this has difference interpretations between an
+ // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the
+ // beginning of the containing stub_table, whereas for Erratum_stub, this is
+ // the offset from the end of reloc_stubs.
+ section_offset_type offset_;
+ // Stub type.
+ const int type_;
+}; // End of "Stub_base".
+
+
+// Erratum stub class. An erratum stub differs from a reloc stub in that for
+// each erratum occurrence, we generate an erratum stub. We never share erratum
+// stubs, whereas for reloc stubs, different branches insns share a single reloc
+// stub as long as the branch targets are the same. (More to the point, reloc
+// stubs can be shared because they're used to reach a specific target, whereas
+// erratum stubs branch back to the original control flow.)
+
+template<int size, bool big_endian>
+class Erratum_stub : public Stub_base<size, big_endian>
+{
+public:
+ typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
+ typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
+
+ static const int STUB_ADDR_ALIGN = 4;
+
+ static const Insntype invalid_insn = static_cast<Insntype>(-1);
+
+ Erratum_stub(The_aarch64_relobj* relobj, int type,
+ unsigned shndx, unsigned int sh_offset)
+ : Stub_base<size, big_endian>(type), relobj_(relobj),
+ shndx_(shndx), sh_offset_(sh_offset),
+ erratum_insn_(invalid_insn),
+ erratum_address_(this->invalid_address)
+ {}
+
+ ~Erratum_stub() {}
+
+ // Return the object that contains the erratum.
+ The_aarch64_relobj*
+ relobj()
+ { return this->relobj_; }
+
+ // Get section index of the erratum.
+ unsigned int
+ shndx() const
+ { return this->shndx_; }
+
+ // Get section offset of the erratum.
+ unsigned int
+ sh_offset() const
+ { return this->sh_offset_; }
+
+ // Get the erratum insn. This is the insn located at erratum_insn_address.
+ Insntype
+ erratum_insn() const
+ {
+ gold_assert(this->erratum_insn_ != this->invalid_insn);
+ return this->erratum_insn_;
+ }
+
+ // Set the insn that the erratum happens to.
+ void
+ set_erratum_insn(Insntype insn)
+ { this->erratum_insn_ = insn; }
+
+ // Return the address where an erratum must be done.
+ AArch64_address
+ erratum_address() const
+ {
+ gold_assert(this->erratum_address_ != this->invalid_address);
+ return this->erratum_address_;
+ }
+
+ // Set the address where an erratum must be done.
+ void
+ set_erratum_address(AArch64_address addr)
+ { this->erratum_address_ = addr; }
+
+ // Comparator used to group Erratum_stubs in a set by (obj, shndx,
+ // sh_offset). We do not include 'type' in the calculation, becuase there is
+ // at most one stub type at (obj, shndx, sh_offset).
+ bool
+ operator<(const Erratum_stub<size, big_endian>& k) const
+ {
+ if (this == &k)
+ return false;
+ // We group stubs by relobj.
+ if (this->relobj_ != k.relobj_)
+ return this->relobj_ < k.relobj_;
+ // Then by section index.
+ if (this->shndx_ != k.shndx_)
+ return this->shndx_ < k.shndx_;
+ // Lastly by section offset.
+ return this->sh_offset_ < k.sh_offset_;
+ }
+
+protected:
+ virtual void
+ do_write(unsigned char*, section_size_type);
+
+private:
+ // The object that needs to be fixed.
+ The_aarch64_relobj* relobj_;
+ // The shndx in the object that needs to be fixed.
+ const unsigned int shndx_;
+ // The section offset in the obejct that needs to be fixed.
+ const unsigned int sh_offset_;
+ // The insn to be fixed.
+ Insntype erratum_insn_;
+ // The address of the above insn.
+ AArch64_address erratum_address_;
+}; // End of "Erratum_stub".
+
+
+// Comparator used in set definition.
+template<int size, bool big_endian>
+struct Erratum_stub_less
+{
+ bool
+ operator()(const Erratum_stub<size, big_endian>* s1,
+ const Erratum_stub<size, big_endian>* s2) const
+ { return *s1 < *s2; }
+};
+
+// Erratum_stub implementation for writing stub to output file.
+
+template<int size, bool big_endian>
+void
+Erratum_stub<size, big_endian>::do_write(unsigned char* view, section_size_type)
+{
+ typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
+ const Insntype* insns = this->insns();
+ uint32_t num_insns = this->insn_num();
+ Insntype* ip = reinterpret_cast<Insntype*>(view);
+ // For current implemnted erratum 843419, (and 835769 which is to be
+ // implemented soon), the first insn in the stub is always a copy of the
+ // problematic insn (in 843419, the mem access insn), followed by a jump-back.
+ elfcpp::Swap<32, big_endian>::writeval(ip, this->erratum_insn());
+ for (uint32_t i = 1; i < num_insns; ++i)
+ elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
+}
+
+
+// Reloc stub class.
+
+template<int size, bool big_endian>
+class Reloc_stub : public Stub_base<size, big_endian>
+{
+ public:
+ typedef Reloc_stub<size, big_endian> This;
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
+
+ // Branch range. This is used to calculate the section group size, as well as
+ // determine whether a stub is needed.
+ static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2;
+ static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2);
+
+ // Constant used to determine if an offset fits in the adrp instruction
+ // encoding.
+ static const int MAX_ADRP_IMM = (1 << 20) - 1;
+ static const int MIN_ADRP_IMM = -(1 << 20);
+
+ static const int BYTES_PER_INSN = 4;
+ static const int STUB_ADDR_ALIGN = 4;
+
+ // Determine whether the offset fits in the jump/branch instruction.
+ static bool
+ aarch64_valid_branch_offset_p(int64_t offset)
+ { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; }
+
+ // Determine whether the offset fits in the adrp immediate field.
+ static bool
+ aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest)
+ {
+ typedef AArch64_relocate_functions<size, big_endian> Reloc;
+ int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12;
+ return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM;
+ }
+
+ // Determine the stub type for a certain relocation or ST_NONE, if no stub is
+ // needed.
+ static int
+ stub_type_for_reloc(unsigned int r_type, AArch64_address address,
+ AArch64_address target);
+
+ Reloc_stub(int type)
+ : Stub_base<size, big_endian>(type)
+ { }
+
+ ~Reloc_stub()
+ { }
+
// The key class used to index the stub instance in the stub table's stub map.
class Key
{
public:
- Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj,
+ Key(int type, const Symbol* symbol, const Relobj* relobj,
unsigned int r_sym, int32_t addend)
- : stub_type_(stub_type), addend_(addend)
+ : type_(type), addend_(addend)
{
if (symbol != NULL)
{
@@ -731,9 +1034,9 @@ class Reloc_stub
{ }
// Return stub type.
- Stub_type
- stub_type() const
- { return this->stub_type_; }
+ int
+ type() const
+ { return this->type_; }
// Return the local symbol index or invalid_index.
unsigned int
@@ -754,7 +1057,7 @@ class Reloc_stub
bool
eq(const Key& k) const
{
- return ((this->stub_type_ == k.stub_type_)
+ return ((this->type_ == k.type_)
&& (this->r_sym_ == k.r_sym_)
&& ((this->r_sym_ != Reloc_stub::invalid_index)
? (this->u_.relobj == k.u_.relobj)
@@ -771,7 +1074,7 @@ class Reloc_stub
? this->u_.relobj->name().c_str()
: this->u_.symbol->name());
// We only have 4 stub types.
- size_t stub_type_hash_value = 0x03 & this->stub_type_;
+ size_t stub_type_hash_value = 0x03 & this->type_;
return (name_hash_value
^ stub_type_hash_value
^ ((this->r_sym_ & 0x3fff) << 2)
@@ -795,7 +1098,7 @@ class Reloc_stub
private:
// Stub type.
- const Stub_type stub_type_;
+ const int type_;
// If this is a local symbol, this is the index in the defining object.
// Otherwise, it is invalid_index for a global symbol.
unsigned int r_sym_;
@@ -820,17 +1123,7 @@ class Reloc_stub
do_write(unsigned char*, section_size_type);
private:
- static const section_offset_type invalid_offset =
- static_cast<section_offset_type>(-1);
static const unsigned int invalid_index = static_cast<unsigned int>(-1);
- static const AArch64_address invalid_address =
- static_cast<AArch64_address>(-1);
-
- static const uint32_t stub_insns_[][10];
-
- const Stub_type stub_type_;
- section_offset_type offset_;
- AArch64_address destination_address_;
}; // End of Reloc_stub
@@ -842,66 +1135,19 @@ Reloc_stub<size, big_endian>::
do_write(unsigned char* view, section_size_type)
{
typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
- const uint32_t* insns = this->stub_insns();
- uint32_t num_insns = this->stub_insn_number();
+ const uint32_t* insns = this->insns();
+ uint32_t num_insns = this->insn_num();
Insntype* ip = reinterpret_cast<Insntype*>(view);
- for (uint32_t i = 1; i <= num_insns; ++i)
- elfcpp::Swap<32, big_endian>::writeval(ip + i - 1, insns[i]);
+ for (uint32_t i = 0; i < num_insns; ++i)
+ elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
}
-// Stubs instructions definition.
-
-template<int size, bool big_endian>
-const uint32_t
-Reloc_stub<size, big_endian>::stub_insns_[][10] =
- {
- // The first element of each group is the num of the insns.
-
- // ST_NONE
- {0, 0},
-
- // ST_ADRP_BRANCH
- {
- 4,
- 0x90000010, /* adrp ip0, X */
- /* ADR_PREL_PG_HI21(X) */
- 0x91000210, /* add ip0, ip0, :lo12:X */
- /* ADD_ABS_LO12_NC(X) */
- 0xd61f0200, /* br ip0 */
- 0x00000000, /* alignment padding */
- },
-
- // ST_LONG_BRANCH_ABS
- {
- 4,
- 0x58000050, /* ldr ip0, 0x8 */
- 0xd61f0200, /* br ip0 */
- 0x00000000, /* address field */
- 0x00000000, /* address fields */
- },
-
- // ST_LONG_BRANCH_PCREL
- {
- 8,
- 0x58000090, /* ldr ip0, 0x10 */
- 0x10000011, /* adr ip1, #0 */
- 0x8b110210, /* add ip0, ip0, ip1 */
- 0xd61f0200, /* br ip0 */
- 0x00000000, /* address field */
- 0x00000000, /* address field */
- 0x00000000, /* alignment padding */
- 0x00000000, /* alignment padding */
- }
- };
-
-
// Determine the stub type for a certain relocation or ST_NONE, if no stub is
// needed.
template<int size, bool big_endian>
-inline
-typename Reloc_stub<size, big_endian>::Stub_type
+inline int
Reloc_stub<size, big_endian>::stub_type_for_reloc(
unsigned int r_type, AArch64_address location, AArch64_address dest)
{
@@ -937,9 +1183,12 @@ class Stub_table : public Output_data
public:
typedef Target_aarch64<size, big_endian> The_target_aarch64;
typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
+ typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
typedef Reloc_stub<size, big_endian> The_reloc_stub;
typedef typename The_reloc_stub::Key The_reloc_stub_key;
+ typedef Erratum_stub<size, big_endian> The_erratum_stub;
+ typedef Erratum_stub_less<size, big_endian> The_erratum_stub_less;
typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash;
typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to;
typedef Stub_table<size, big_endian> The_stub_table;
@@ -949,8 +1198,12 @@ class Stub_table : public Output_data
typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter;
typedef Relocate_info<size, big_endian> The_relocate_info;
+ typedef std::set<The_erratum_stub*, The_erratum_stub_less> Erratum_stub_set;
+ typedef typename Erratum_stub_set::iterator Erratum_stub_set_iter;
+
Stub_table(The_aarch64_input_section* owner)
- : Output_data(), owner_(owner), reloc_stubs_size_(0), prev_data_size_(0)
+ : Output_data(), owner_(owner), reloc_stubs_size_(0),
+ erratum_stubs_size_(0), prev_data_size_(0)
{ }
~Stub_table()
@@ -963,7 +1216,7 @@ class Stub_table : public Output_data
// Whether this stub table is empty.
bool
empty() const
- { return reloc_stubs_.empty(); }
+ { return reloc_stubs_.empty() && erratum_stubs_.empty(); }
// Return the current data size.
off_t
@@ -975,6 +1228,32 @@ class Stub_table : public Output_data
void
add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key);
+ // Add an erratum stub into the erratum stub set. The set is ordered by
+ // (relobj, shndx, sh_offset).
+ void
+ add_erratum_stub(The_erratum_stub* stub);
+
+ // Find if such erratum exists for any given (obj, shndx, sh_offset).
+ The_erratum_stub*
+ find_erratum_stub(The_aarch64_relobj* a64relobj,
+ unsigned int shndx, unsigned int sh_offset);
+
+ // Find all the erratums for a given input section. The return value is a pair
+ // of iterators [begin, end).
+ std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
+ find_erratum_stubs_for_input_section(The_aarch64_relobj* a64relobj,
+ unsigned int shndx);
+
+ // Compute the erratum stub address.
+ AArch64_address
+ erratum_stub_address(The_erratum_stub* stub) const
+ {
+ AArch64_address r = align_address(this->address() + this->reloc_stubs_size_,
+ The_erratum_stub::STUB_ADDR_ALIGN);
+ r += stub->offset();
+ return r;
+ }
+
// Finalize stubs. No-op here, just for completeness.
void
finalize_stubs()
@@ -1003,7 +1282,9 @@ class Stub_table : public Output_data
update_data_size_changed_p()
{
// No addralign changed here.
- off_t s = this->reloc_stubs_size_;
+ off_t s = align_address(this->reloc_stubs_size_,
+ The_erratum_stub::STUB_ADDR_ALIGN)
+ + this->erratum_stubs_size_;
bool changed = (s != this->prev_data_size_);
this->prev_data_size_ = s;
return changed;
@@ -1017,7 +1298,10 @@ class Stub_table : public Output_data
// Return the required alignment.
uint64_t
do_addralign() const
- { return The_reloc_stub::STUB_ADDR_ALIGN; }
+ {
+ return std::max(The_reloc_stub::STUB_ADDR_ALIGN,
+ The_erratum_stub::STUB_ADDR_ALIGN);
+ }
// Reset address and file offset.
void
@@ -1045,13 +1329,79 @@ class Stub_table : public Output_data
The_aarch64_input_section* owner_;
// The relocation stubs.
Reloc_stub_map reloc_stubs_;
+ // The erratum stubs.
+ Erratum_stub_set erratum_stubs_;
// Size of reloc stubs.
off_t reloc_stubs_size_;
+ // Size of erratum stubs.
+ off_t erratum_stubs_size_;
// data size of this in the previous pass.
off_t prev_data_size_;
}; // End of Stub_table
+// Add an erratum stub into the erratum stub set. The set is ordered by
+// (relobj, shndx, sh_offset).
+
+template<int size, bool big_endian>
+void
+Stub_table<size, big_endian>::add_erratum_stub(The_erratum_stub* stub)
+{
+ std::pair<Erratum_stub_set_iter, bool> ret =
+ this->erratum_stubs_.insert(stub);
+ gold_assert(ret.second);
+ this->erratum_stubs_size_ = align_address(
+ this->erratum_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
+ stub->set_offset(this->erratum_stubs_size_);
+ this->erratum_stubs_size_ += stub->stub_size();
+}
+
+
+// Find if such erratum exists for givein (obj, shndx, sh_offset).
+
+template<int size, bool big_endian>
+Erratum_stub<size, big_endian>*
+Stub_table<size, big_endian>::find_erratum_stub(
+ The_aarch64_relobj* a64relobj, unsigned int shndx, unsigned int sh_offset)
+{
+ // A dummy object used as key to search in the set.
+ The_erratum_stub key(a64relobj, ST_NONE,
+ shndx, sh_offset);
+ Erratum_stub_set_iter i = this->erratum_stubs_.find(&key);
+ if (i != this->erratum_stubs_.end())
+ {
+ The_erratum_stub* stub(*i);
+ gold_assert(stub->erratum_insn() != 0);
+ return stub;
+ }
+ return NULL;
+}
+
+
+// Find all the errata for a given input section. The return value is a pair of
+// iterators [begin, end).
+
+template<int size, bool big_endian>
+std::pair<typename Stub_table<size, big_endian>::Erratum_stub_set_iter,
+ typename Stub_table<size, big_endian>::Erratum_stub_set_iter>
+Stub_table<size, big_endian>::find_erratum_stubs_for_input_section(
+ The_aarch64_relobj* a64relobj, unsigned int shndx)
+{
+ typedef std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> Result_pair;
+ Erratum_stub_set_iter start, end;
+ The_erratum_stub low_key(a64relobj, ST_NONE, shndx, 0);
+ start = this->erratum_stubs_.lower_bound(&low_key);
+ if (start == this->erratum_stubs_.end())
+ return Result_pair(this->erratum_stubs_.end(),
+ this->erratum_stubs_.end());
+ end = start;
+ while (end != this->erratum_stubs_.end() &&
+ (*end)->relobj() == a64relobj && (*end)->shndx() == shndx)
+ ++end;
+ return Result_pair(start, end);
+}
+
+
// Add a STUB using KEY. The caller is responsible for avoiding addition
// if a STUB with the same key has already been added.
@@ -1060,7 +1410,7 @@ void
Stub_table<size, big_endian>::add_reloc_stub(
The_reloc_stub* stub, const The_reloc_stub_key& key)
{
- gold_assert(stub->stub_type() == key.stub_type());
+ gold_assert(stub->type() == key.type());
this->reloc_stubs_[key] = stub;
// Assign stub offset early. We can do this because we never remove
@@ -1091,6 +1441,35 @@ relocate_stubs(const The_relocate_info* relinfo,
p != this->reloc_stubs_.end(); ++p)
relocate_stub(p->second, relinfo, target_aarch64, output_section,
view, address, view_size);
+
+ // Just for convenience.
+ const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
+
+ // Now 'relocate' erratum stubs.
+ for(Erratum_stub_set_iter i = this->erratum_stubs_.begin();
+ i != this->erratum_stubs_.end(); ++i)
+ {
+ AArch64_address stub_address = this->erratum_stub_address(*i);
+ // The address of "b" in the stub that is to be "relocated".
+ AArch64_address stub_b_insn_address;
+ // Branch offset that is to be filled in "b" insn.
+ int b_offset = 0;
+ switch ((*i)->type())
+ {
+ case ST_E_843419:
+ // For the erratum, the 2nd insn is a b-insn to be patched
+ // (relocated).
+ stub_b_insn_address = stub_address + 1 * BPI;
+ b_offset = (*i)->destination_address() - stub_b_insn_address;
+ AArch64_relocate_functions<size, big_endian>::construct_b(
+ view + (stub_b_insn_address - this->address()),
+ ((unsigned int)(b_offset)) & 0xfffffff);
+ break;
+ default:
+ gold_unreachable();
+ break;
+ }
+ }
}
@@ -1140,6 +1519,17 @@ Stub_table<size, big_endian>::do_write(Output_file* of)
stub->write(oview + stub->offset(), stub->stub_size());
}
+ // Write erratum stubs.
+ unsigned int erratum_stub_start_offset =
+ align_address(this->reloc_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
+ for (typename Erratum_stub_set::iterator p = this->erratum_stubs_.begin();
+ p != this->erratum_stubs_.end(); ++p)
+ {
+ The_erratum_stub* stub(*p);
+ stub->write(oview + erratum_stub_start_offset + stub->offset(),
+ stub->stub_size());
+ }
+
of->write_output_view(this->offset(), oview_size, oview);
}
@@ -1155,6 +1545,8 @@ class AArch64_relobj : public Sized_relobj_file<size, big_endian>
typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
typedef Stub_table<size, big_endian> The_stub_table;
+ typedef Erratum_stub<size, big_endian> The_erratum_stub;
+ typedef typename The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter;
typedef std::vector<The_stub_table*> Stub_table_list;
static const AArch64_address invalid_address =
static_cast<AArch64_address>(-1);
@@ -1258,6 +1650,10 @@ class AArch64_relobj : public Sized_relobj_file<size, big_endian>
Stringpool_template<char>*);
private:
+ // Fix all errata in the object.
+ void
+ fix_errata(typename Sized_relobj_file<size, big_endian>::Views* pviews);
+
// Whether a section needs to be scanned for relocation stubs.
bool
section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&,
@@ -1353,6 +1749,48 @@ AArch64_relobj<size, big_endian>::do_count_local_symbols(
}
+// Fix all errata in the object.
+
+template<int size, bool big_endian>
+void
+AArch64_relobj<size, big_endian>::fix_errata(
+ typename Sized_relobj_file<size, big_endian>::Views* pviews)
+{
+ typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
+ unsigned int shnum = this->shnum();
+ for (unsigned int i = 1; i < shnum; ++i)
+ {
+ The_stub_table* stub_table = this->stub_table(i);
+ if (!stub_table)
+ continue;
+ std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
+ ipair(stub_table->find_erratum_stubs_for_input_section(this, i));
+ Erratum_stub_set_iter p = ipair.first, end = ipair.second;
+ while (p != end)
+ {
+ The_erratum_stub* stub = *p;
+ typename Sized_relobj_file<size, big_endian>::View_size&
+ pview((*pviews)[i]);
+
+ // Double check data before fix.
+ Insntype* ip =
+ reinterpret_cast<Insntype*>(pview.view + stub->sh_offset());
+ Insntype insn_to_fix = ip[0];
+ gold_assert(insn_to_fix == stub->erratum_insn());
+ gold_assert(pview.address + stub->sh_offset()
+ == stub->erratum_address());
+
+ AArch64_address stub_address =
+ stub_table->erratum_stub_address(stub);
+ unsigned int b_offset = stub_address - stub->erratum_address();
+ AArch64_relocate_functions<size, big_endian>::construct_b(
+ pview.view + stub->sh_offset(), b_offset & 0xfffffff);
+ ++p;
+ }
+ }
+}
+
+
// Relocate sections.
template<int size, bool big_endian>
@@ -1370,6 +1808,9 @@ AArch64_relobj<size, big_endian>::do_relocate_sections(
if (parameters->options().relocatable())
return;
+ if (parameters->options().fix_cortex_a53_843419())
+ this->fix_errata(pviews);
+
Relocate_info<size, big_endian> relinfo;
relinfo.symtab = symtab;
relinfo.layout = layout;
@@ -2088,7 +2529,7 @@ class Target_aarch64 : public Sized_target<size, big_endian>
typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
typedef Reloc_stub<size, big_endian> The_reloc_stub;
- typedef typename The_reloc_stub::Stub_type The_reloc_stub_type;
+ typedef Erratum_stub<size, big_endian> The_erratum_stub;
typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key;
typedef Stub_table<size, big_endian> The_stub_table;
typedef std::vector<The_stub_table*> Stub_table_list;
@@ -3029,9 +3470,9 @@ Target_aarch64<size, big_endian>::scan_reloc_for_stub(
gold_unreachable();
}
- typename The_reloc_stub::Stub_type stub_type = The_reloc_stub::
+ int stub_type = The_reloc_stub::
stub_type_for_reloc(r_type, address, destination);
- if (stub_type == The_reloc_stub::ST_NONE)
+ if (stub_type == ST_NONE)
return;
The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
@@ -3285,20 +3726,20 @@ relocate_stub(The_reloc_stub* stub,
typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
Insntype* ip = reinterpret_cast<Insntype*>(view);
- int insn_number = stub->stub_insn_number();
- const uint32_t* insns = stub->stub_insns();
+ int insn_number = stub->insn_num();
+ const uint32_t* insns = stub->insns();
// Check the insns are really those stub insns.
for (int i = 0; i < insn_number; ++i)
{
Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i);
- gold_assert(((uint32_t)insn == insns[i+1]));
+ gold_assert(((uint32_t)insn == insns[i]));
}
Address dest = stub->destination_address();
- switch(stub->stub_type())
+ switch(stub->type())
{
- case The_reloc_stub::ST_ADRP_BRANCH:
+ case ST_ADRP_BRANCH:
{
// 1st reloc is ADR_PREL_PG_HI21
The_reloc_functions_status status =
@@ -3319,12 +3760,12 @@ relocate_stub(The_reloc_stub* stub,
}
break;
- case The_reloc_stub::ST_LONG_BRANCH_ABS:
+ case ST_LONG_BRANCH_ABS:
// 1st reloc is R_AARCH64_PREL64, at offset 8
elfcpp::Swap<64,big_endian>::writeval(view + 8, dest);
break;
- case The_reloc_stub::ST_LONG_BRANCH_PCREL:
+ case ST_LONG_BRANCH_PCREL:
{
// "PC" calculation is the 2nd insn in the stub.
uint64_t offset = dest - (address + 4);
@@ -4273,7 +4714,6 @@ class AArch64_relocate_functions
typedef Relocate_info<size, big_endian> The_relocate_info;
typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
typedef Reloc_stub<size, big_endian> The_reloc_stub;
- typedef typename The_reloc_stub::Stub_type The_reloc_stub_type;
typedef Stub_table<size, big_endian> The_stub_table;
typedef elfcpp::Rela<size, big_endian> The_rela;
typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype;
@@ -4406,6 +4846,15 @@ class AArch64_relocate_functions
public:
+ // Construct a B insn. Note, although we group it here with other relocation
+ // operation, there is actually no 'relocation' involved here.
+ static inline void
+ construct_b(unsigned char* view, unsigned int branch_offset)
+ {
+ update_view_two_parts<32>(view, 0x05, (branch_offset >> 2),
+ 26, 0, 0xffffffff);
+ }
+
// Do a simple rela relocation at unaligned addresses.
template<int valsize>
@@ -4651,9 +5100,9 @@ maybe_apply_stub(unsigned int r_type,
typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend();
Address branch_target = psymval->value(object, 0) + addend;
- The_reloc_stub_type stub_type = The_reloc_stub::
- stub_type_for_reloc(r_type, address, branch_target);
- if (stub_type == The_reloc_stub::ST_NONE)
+ int stub_type =
+ The_reloc_stub::stub_type_for_reloc(r_type, address, branch_target);
+ if (stub_type == ST_NONE)
return false;
const The_aarch64_relobj* aarch64_relobj =
@@ -7253,9 +7702,15 @@ Target_aarch64<size, big_endian>::scan_erratum_843419_span(
{
Insntype insn2 = ip[1];
Insntype insn3 = ip[2];
+ Insntype erratum_insn;
+ unsigned insn_offset;
bool do_report = false;
if (is_erratum_843419_sequence(insn1, insn2, insn3))
- do_report = true;
+ {
+ do_report = true;
+ erratum_insn = insn3;
+ insn_offset = 2 * Insn_utilities::BYTES_PER_INSN;
+ }
else if (offset + 4 * Insn_utilities::BYTES_PER_INSN <= span_length)
{
// Optionally we can have an insn between ins2 and ins3
@@ -7272,15 +7727,41 @@ Target_aarch64<size, big_endian>::scan_erratum_843419_span(
Insntype insn4 = ip[3];
if (is_erratum_843419_sequence(insn1, insn2, insn4))
- do_report = true;
+ {
+ do_report = true;
+ erratum_insn = insn4;
+ insn_offset = 3 * Insn_utilities::BYTES_PER_INSN;
+ }
}
}
if (do_report)
{
- gold_error(_("Erratum 943419 found at \"%s\", section %d, "
- "offset 0x%08x."),
- relobj->name().c_str(), shndx,
- (unsigned int)(span_start + offset));
+ gold_warning(_("Erratum 843419 found and fixed at \"%s\", "
+ "section %d, offset 0x%08x."),
+ relobj->name().c_str(), shndx,
+ (unsigned int)(span_start + offset));
+ unsigned int errata_insn_offset =
+ span_start + offset + insn_offset;
+ The_stub_table* stub_table = relobj->stub_table(shndx);
+ gold_assert(stub_table != NULL);
+ if (stub_table->find_erratum_stub(relobj,
+ shndx,
+ errata_insn_offset) == NULL)
+ {
+ The_erratum_stub* stub = new The_erratum_stub(
+ relobj, ST_E_843419, shndx,
+ errata_insn_offset);
+ Address erratum_address =
+ output_address + offset + insn_offset;
+ // Stub destination address is the next insn after the
+ // erratum.
+ Address dest_address = erratum_address
+ + Insn_utilities::BYTES_PER_INSN;
+ stub->set_erratum_insn(erratum_insn);
+ stub->set_erratum_address(erratum_address);
+ stub->set_destination_address(dest_address);
+ stub_table->add_erratum_stub(stub);
+ }
}
}
@@ -7292,7 +7773,7 @@ Target_aarch64<size, big_endian>::scan_erratum_843419_span(
else // (page_offset == 0xffc), we move to next page's 0xff8.
offset += 0xffc;
}
-}
+} // End of "Target_aarch64::scan_erratum_843419_span".
// The selector for aarch64 object files.