[AArch64] Workaround for Cortex A53 erratum 843419

Some early revisions of the Cortex-A53 have an erratum (843419).  The
details of the erratum are quite complex and involve dynamic
conditions.  For the purposes of the workaround we have simplified the
static conditions to an ADRP in the last two instructions of a 4KByte
page, followed within four instructions by a load/store dependent on
the ADRP.

This patch adds support to conservatively scan for and workaround
Cortex A53 erratum 843419.  There are two different workaround
strategies used.  The first is to rewrite ADRP instructions which form
part of an erratum sequence with an ADR instruction.  In situations
where the ADR provides insufficient offset the dependent load or store
instruction from the sequence is moved to a stub section and branches
are inserted from the original sequence to the relocated instruction
and back again.

Stub section sizes are rounded up to a multiple of 4096 in order to
ensure that the act of inserting work around stubs does not create
more errata sequences.

Workaround stubs are always inserted into the stub section associated
with the input section containing the erratum sequence.  This ensures
that the fully relocated form of the veneered load store instruction
is available at the point in time when the stub section is written.

Author: mshawcroft

bfd/ChangeLog

@@ -1,3 +1,44 @@
+2015-04-01  Tejas Belagod  <[email protected]>
+	    Marcus Shawcroft  <[email protected]>
+	    Jiong Wang  <[email protected]>
+
+	* bfd-in.h (bfd_elf64_aarch64_set_options)
+	(bfd_elf32_aarch64_set_options): Add parameter.
+	* bfd-in2.h: Regenerated.
+	* elfnn-aarch64.c (aarch64_erratum_843419_stub)
+	(_bfd_aarch64_adrp_p, _bfd_aarch64_erratum_843419_sequence_p)
+	(_bfd_aarch64_erratum_843419_stub_name)
+	(_bfd_aarch64_erratum_843419_fixup)
+	(_bfd_aarch64_erratum_843419_scan)
+	(_bfd_aarch64_erratum_843419_branch_to_stub)
+	(_bfd_aarch64_erratum_843419_p): Define.
+	(enum elf_aarch64_stub_type): Define
+	aarch64_stub_erratum_843419_veneer.
+	(struct elf_aarch64_stub_hash_entry): Define adrp_offset.
+	(struct elf_aarch64_link_hash_table): Define fix_erratum_843419
+	and fix_erratum_843419_adr.
+	(stub_hash_newfunc): Initialize adrp_offset;
+	(_bfd_aarch64_add_stub_entry_after): Define.
+	(aarch64_map_one_stub, aarch64_build_one_stub)
+	(aarch64_size_one_stub): Handle
+	aarch64_stub_erratum_843419_veneer.
+	(_bfd_aarch64_resize_stubs): Round stub section size.
+	(elfNN_aarch64_size_stubs): Add scan for 843419.
+	(bfd_elfNN_aarch64_set_options): Add parameter. Initialize
+	fix_erratum_843419 and fix_erratum_843419_adr.
+	(struct erratum_835769_branch_to_stub_data): Add info.
+	(elfNN_aarch64_write_section): Initialise info.  Handle 843419.
+	(elfNN_aarch64_size_dynamic_sections): Handle 843419.
+	* elfxx-aarch64.c (_bfd_aarch64_decode_adrp_imm)
+	(_bfd_aarch64_sign_extend): Define.
+	(reencode_adr_imm): Remove static. Rename to:
+	(_bfd_aarch64_reencode_adr_imm): Define.
+	(_bfd_aarch64_elf_put_addend): Call _bfd_aarch64_reencode_adr_imm.
+	* elfxx-aarch64.h (AARCH64_ADR_OP, AARCH64_ADRP_OP)
+	(AARCH64_ADRP_OP_MASK, _bfd_aarch64_sign_extend)
+	(_bfd_aarch64_decode_adrp_imm, _bfd_aarch64_reencode_adr_imm):
+	Define.
+
 2015-04-01  H.J. Lu  <[email protected]>
 
 	* configure: Regenerated.

bfd/bfd-in.h

@@ -934,10 +934,10 @@ extern void bfd_elf32_aarch64_init_maps
   (bfd *);
 
 extern void bfd_elf64_aarch64_set_options
-  (bfd *, struct bfd_link_info *, int, int, int, int);
+  (bfd *, struct bfd_link_info *, int, int, int, int, int);
 
 extern void bfd_elf32_aarch64_set_options
-  (bfd *, struct bfd_link_info *, int, int, int, int);
+  (bfd *, struct bfd_link_info *, int, int, int, int, int);
 
 /* ELF AArch64 mapping symbol support.  */
 #define BFD_AARCH64_SPECIAL_SYM_TYPE_MAP	(1 << 0)

bfd/bfd-in2.h

@@ -941,10 +941,10 @@ extern void bfd_elf32_aarch64_init_maps
   (bfd *);
 
 extern void bfd_elf64_aarch64_set_options
-  (bfd *, struct bfd_link_info *, int, int, int, int);
+  (bfd *, struct bfd_link_info *, int, int, int, int, int);
 
 extern void bfd_elf32_aarch64_set_options
-  (bfd *, struct bfd_link_info *, int, int, int, int);
+  (bfd *, struct bfd_link_info *, int, int, int, int, int);
 
 /* ELF AArch64 mapping symbol support.  */
 #define BFD_AARCH64_SPECIAL_SYM_TYPE_MAP	(1 << 0)