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[gold] First patch for aarch64 backend
- From: Jing Yu <jingyu at google dot com>
- To: binutils at sourceware dot org
- Cc: Han Shen <shenhan at google dot com>, Doug Kwan <dougkwan at google dot com>, Cary Coutant <ccoutant at google dot com>
- Date: Wed, 25 Jun 2014 16:46:36 -0700
- Subject: [gold] First patch for aarch64 backend
- Authentication-results: sourceware.org; auth=none
Hi,
We start to work on gold aarch64 backend. Here is the first patch.
This patch is just a skeleton which almost does nothing.
The change that enables gold for aarch64 in top level configure was
removed from this patch.
Tested:
1) On x86_64,
${binutils}/configure --build=x86_64-unknown-linux-gnu
--host=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu
--enable-plugins --disable-multilib --disable-nls --enable-threads
--enable-gold=default --enable-targets=all
$make all-gold
Also built with -O1 and -O0.
2) On aarch64,
gcc version 4.8.2 (Ubuntu/Linaro 4.8.2-19ubuntu1)
$ ../binutils-gdb/configure --enable-plugins --disable-multilib
--disable-nls --enable-threads --enable-gold=default
--enable-targets=all
$make all-gold
Also built with -O1 and -O0.
The generated native gold/ld-new is able to read hello.o and libc.so.
Thanks,
Jing
diff --git a/elfcpp/aarch64.h b/elfcpp/aarch64.h
new file mode 100644
index 0000000..09bc498
--- /dev/null
+++ b/elfcpp/aarch64.h
@@ -0,0 +1,183 @@
+// aarch64.h -- ELF definitions specific to AARCH64 -*- C++ -*-
+
+// Copyright (C) 2012-2014 Free Software Foundation, Inc.
+// Written by Jing Yu (jingyu@google.com)
+
+// This file is part of elfcpp.
+
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public License
+// as published by the Free Software Foundation; either version 2, or
+// (at your option) any later version.
+
+// In addition to the permissions in the GNU Library General Public
+// License, the Free Software Foundation gives you unlimited
+// permission to link the compiled version of this file into
+// combinations with other programs, and to distribute those
+// combinations without any restriction coming from the use of this
+// file. (The Library Public License restrictions do apply in other
+// respects; for example, they cover modification of the file, and
+/// distribution when not linked into a combined executable.)
+
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Library General Public License for more details.
+
+// You should have received a copy of the GNU Library General Public
+// License along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
+// 02110-1301, USA.
+
+#ifndef ELFCPP_AARCH64_H
+#define ELFCPP_AARCH64_H
+
+namespace elfcpp
+{
+
+// The relocation type information is taken from:
+//
+// ELF for the ARM 64-bit Architecture (AArch64)
+// Document number: ARM IHI 0056B, current through AArch64 ABI release 1.0
+// Date of Issue: 22nd May, 2013
+//
+
+enum
+{
+ // Null relocation codes
+ R_AARCH64_NONE = 0, // None
+ withdrawn = 256, // Treat as R_AARCH64_NONE
+
+ // Static relocations
+ R_AARCH64_ABS64 = 257, // S + A
+ R_AARCH64_ABS32 = 258, // S + A
+ R_AARCH64_ABS16 = 259, // S + A
+ R_AARCH64_PREL64 = 260, // S + A - P
+ R_AARCH64_PREL32 = 261, // S + A - P
+ R_AARCH64_PREL16 = 262, // S + A - P
+ R_AARCH64_MOVW_UABS_G0 = 263, // S + A
+ R_AARCH64_MOVW_UABS_G0_NC = 264, // S + A
+ R_AARCH64_MOVW_UABS_G1 = 265, // S + A
+ R_AARCH64_MOVW_UABS_G1_NC = 266, // S + A
+ R_AARCH64_MOVW_UABS_G2 = 267, // S + A
+ R_AARCH64_MOVW_UABS_G2_NC = 268, // S + A
+ R_AARCH64_MOVW_UABS_G3 = 269, // S + A
+ R_AARCH64_MOVW_SABS_G0 = 270, // S + A
+ R_AARCH64_MOVW_SABS_G1 = 271, // S + A
+ R_AARCH64_MOVW_SABS_G2 = 272, // S + A
+ R_AARCH64_LD_PREL_LO19 = 273, // S + A - P
+ R_AARCH64_ADR_PREL_LO21 = 274, // S + A - P
+ R_AARCH64_ADR_PREL_PG_HI21 = 275, // Page(S+A) - Page(P)
+ R_AARCH64_ADR_PREL_PG_HI21_NC = 276, // Page(S+A) - Page(P)
+ R_AARCH64_ADD_ABS_LO12_NC = 277, // S + A
+ R_AARCH64_LDST8_ABS_LO12_NC = 278, // S + A
+ R_AARCH64_TSTBR14 = 279, // S + A - P
+ R_AARCH64_CONDBR19 = 280, // S + A - P
+ R_AARCH64_JUMP26 = 282, // S + A - P
+ R_AARCH64_CALL26 = 283, // S + A - P
+ R_AARCH64_LDST16_ABS_LO12_NC = 284, // S + A
+ R_AARCH64_LDST32_ABS_LO12_NC = 285, // S + A
+ R_AARCH64_LDST64_ABS_LO12_NC = 286, // S + A
+ R_AARCH64_MOVW_PREL_G0 = 287, // S + A - P
+ R_AARCH64_MOVW_PREL_G0_NC = 288, // S + A - P
+ R_AARCH64_MOVW_PREL_G1 = 289, // S + A - P
+ R_AARCH64_MOVW_PREL_G1_NC = 290, // S + A - P
+ R_AARCH64_MOVW_PREL_G2 = 291, // S + A - P
+ R_AARCH64_MOVW_PREL_G2_NC = 292, // S + A - P
+ R_AARCH64_MOVW_PREL_G3 = 293, // S + A - P
+ R_AARCH64_LDST128_ABS_LO12_NC = 299, // S + A
+ R_AARCH64_MOVW_GOTOFF_G0 = 300, // G(GDAT(S+A))-GOT
+ R_AARCH64_MOVW_GOTOFF_G0_NC = 301, // G(GDAT(S+A))-GOT
+ R_AARCH64_MOVW_GOTOFF_G1 = 302, // G(GDAT(S+A))-GOT
+ R_AARCH64_MOVW_GOTOFF_G1_NC = 303, // G(GDAT(S+A))-GOT
+ R_AARCH64_MOVW_GOTOFF_G2 = 304, // G(GDAT(S+A))-GOT
+ R_AARCH64_MOVW_GOTOFF_G2_NC = 305, // G(GDAT(S+A))-GOT
+ R_AARCH64_MOVW_GOTOFF_G3 = 306, // G(GDAT(S+A))-GOT
+ R_AARCH64_GOTREL64 = 307, // S + A - GOT
+ R_AARCH64_GOTREL32 = 308, // S + A - GOT
+ R_AARCH64_GOT_LD_PREL19 = 309, // G(GDAT(S+A))-P
+ R_AARCH64_LD64_GOTOFF_LO15 = 310, // G(GDAT(S+A))-GOT
+ R_AARCH64_ADR_GOT_PAGE = 311, // Page(G(GDAT(S+A)))-Page(P)
+ R_AARCH64_LD64_GOT_LO12_NC = 312, // G(GDAT(S+A))
+ R_AARCH64_LD64_GOTPAGE_LO15 = 313, // G(GDAT(S+A))-Page(GOT)
+
+ // Relocations for thread-local storage
+ R_AARCH64_TLSGD_ADR_PREL21 = 512, // G(GTLSIDX(S,A)) - P
+ R_AARCH64_TLSGD_ADR_PAGE21 = 513, // Page(G(GTLSIDX(S,A)))-Page(P)
+ R_AARCH64_TLSGD_ADD_LO12_NC = 514, // G(GTLSICX(S,A))
+ R_AARCH64_TLSGD_MOVW_G1 = 515, // G(GTLSIDX(S,A)) - GOT
+ R_AARCH64_TLSGD_MOVW_G0_NC = 516, // G(GTLSIDX(S,A)) - GOT
+
+ R_AARCH64_TLSLD_ADR_PREL21 = 517, // G(GLDM(S)) - P
+ R_AARCH64_TLSLD_ADR_PAGE21 = 518, // Page(G(GLDM(S))) - Page(P)
+ R_AARCH64_TLSLD_ADD_LO12_NC = 519, // G(GLDM(S))
+ R_AARCH64_TLSLD_MOVW_G1 = 520, // G(GLDM(S)) - GOT
+ R_AARCH64_TLSLD_MOVW_G0_NC = 521, // G(GLDM(S)) - GOT
+ R_AARCH64_TLSLD_LD_PREL19 = 522, // G(GLDM(S)) - P
+ R_AARCH64_TLSLD_MOVW_DTPREL_G2 = 523, // DTPREL(S+A)
+ R_AARCH64_TLSLD_MOVW_DTPREL_G1 = 524, // DTPREL(S+A)
+ R_AARCH64_TLSLD_MOVW_DTPREL_G1_NC = 525, // DTPREL(S+A)
+ R_AARCH64_TLSLD_MOVW_DTPREL_G0 = 526, // DTPREL(S+A)
+ R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC = 527, // DTPREL(S+A)
+ R_AARCH64_TLSLD_ADD_DTPREL_HI12 = 528, // DTPREL(S+A)
+ R_AARCH64_TLSLD_ADD_DTPREL_LO12 = 529, // DTPREL(S+A)
+ R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC = 530, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST8_DTPREL_LO12 = 531, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC = 532, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST16_DTPREL_LO12 = 533, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC = 534, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST32_DTPREL_LO12 = 535, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC = 536, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST64_DTPREL_LO12 = 537, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC = 538, // DTPREL(S+A)
+ R_AARCH64_TLSIE_MOVW_GOTTPREL_G1 = 539, // G(GTPREL(S+A)) - GOT
+ R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC = 540, // G(GTPREL(S+A)) - GOT
+ R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21 = 541, // Page(G(GTPREL(S+A)))-Page(P)
+ R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC = 542, // G(GTPREL(S+A))
+ R_AARCH64_TLSIE_LD_GOTTPREL_PREL19 = 543, // G(GTPREL(S+A)) - P
+ R_AARCH64_TLSLE_MOVW_TPREL_G2 = 544, // TPREL(S+A)
+ R_AARCH64_TLSLE_MOVW_TPREL_G1 = 545, // TPREL(S+A)
+ R_AARCH64_TLSLE_MOVW_TPREL_G1_NC = 546, // TPREL(S+A)
+ R_AARCH64_TLSLE_MOVW_TPREL_G0 = 547, // TPREL(S+A)
+ R_AARCH64_TLSLE_MOVW_TPREL_G0_NC = 548, // TPREL(S+A)
+ R_AARCH64_TLSLE_ADD_TPREL_HI12 = 549, // TPREL(S+A)
+ R_AARCH64_TLSLE_ADD_TPREL_LO12 = 550, // TPREL(S+A)
+ R_AARCH64_TLSLE_ADD_TPREL_LO12_NC = 551, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST8_TPREL_LO12 = 552, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC = 553, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST16_TPREL_LO12 = 554, // TPREL(S+A)
+ R_AARCH64_TLSLE_LSDT16_TPREL_LO12_NC = 555, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST32_TPREL_LO12 = 556, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC = 557, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST64_TPREL_LO12 = 558, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC = 559, // TPREL(S+A)
+ R_AARCH64_TLSDESC_LD_PREL19 = 560, // G(GTLSDESC(S+A)) - P
+ R_AARCH64_TLSDESC_ADR_PREL21 = 561, // G(GTLSDESC(S+A)) - P
+ R_AARCH64_TLSDESC_ADR_PAGE21 = 562, // Page(G(GTLSDESC(S+A)))-Page(P)
+ R_AARCH64_TLSDESC_LD64_LO12 = 563, // G(GTLSDESC(S+A))
+ R_AARCH64_TLSDESC_ADD_LO12 = 564, // G(GTLSDESC(S+A))
+ R_AARCH64_TLSDESC_OFF_G1 = 565, // G(GTLSDESC(S+A)) - GOT
+ R_AARCH64_TLSDESC_OFF_G0_NC = 566, // G(GTLSDESC(S+A)) - GOT
+ R_AARCH64_TLSDESC_LDR = 567, // None
+ R_AARCH64_TLSDESC_ADD = 568, // None
+ R_AARCH64_TLSDESC_CALL = 569, // None
+ R_AARCH64_TLSLE_LDST128_TPREL_LO12 = 570, // TPREL(S+A)
+ R_AARCH64_TLSLE_LDST128_TPREL_LO12_NC = 571, // TPREL(S+A)
+ R_AARCH64_TLSLD_LDST128_DTPREL_LO12 = 572, // DTPREL(S+A)
+ R_AARCH64_TLSLD_LDST128_DTPREL_LO12_NC = 573, // DTPREL(S+A)
+
+ // Dynamic relocations
+ R_AARCH64_COPY = 1024,
+ R_AARCH64_GLOB_DAT = 1025, // S + A
+ R_AARCH64_JUMP_SLOT = 1026, // S + A
+ R_AARCH64_RELATIVE = 1027, // Delta(S) + A
+ R_AARCH64_TLS_DTPREL64 = 1028, // DTPREL(S+A)
+ R_AARCH64_TLS_DTPMOD64 = 1029, // LDM(S)
+ R_AARCH64_TLS_TPREL64 = 1030, // TPREL(S+A)
+ R_AARCH64_TLSDESC = 1031, // TLSDESC(S+A)
+ R_AARCH64_IRELATIVE = 1032, // Indirect(Delta(S) + A)
+};
+
+} // End namespace elfcpp.
+
+#endif // !defined(ELFCPP_AARCH64_H)
diff --git a/elfcpp/elfcpp.h b/elfcpp/elfcpp.h
index 561b54a..8e8e675 100644
--- a/elfcpp/elfcpp.h
+++ b/elfcpp/elfcpp.h
@@ -268,6 +268,7 @@ enum EM
EM_UNICORE = 110,
EM_ALTERA_NIOS2 = 113,
EM_CRX = 114,
+ EM_AARCH64 = 183,
EM_TILEGX = 191,
// The Morph MT.
EM_MT = 0x2530,
@@ -406,6 +407,9 @@ enum SHT
// Section contains miscellaneous options.
SHT_MIPS_OPTIONS = 0x7000000d,
+ // AARCH64-specific section type.
+ SHT_AARCH64_ATTRIBUTES = 0x70000003,
+
// Link editor is to sort the entries in this section based on the
// address specified in the associated symbol table entry.
SHT_ORDERED = 0x7fffffff
@@ -490,7 +494,11 @@ enum PT
// Runtime procedure table.
PT_MIPS_RTPROC = 0x70000001,
// .MIPS.options section.
- PT_MIPS_OPTIONS = 0x70000002
+ PT_MIPS_OPTIONS = 0x70000002,
+ // Platform architecture compatibility information
+ PT_AARCH64_ARCHEXT = 0x70000000,
+ // Exception unwind tables
+ PT_AARCH64_UNWIND = 0x70000001
};
// The valid bit flags found in the Phdr p_flags field.
diff --git a/gold/Makefile.am b/gold/Makefile.am
index dd05e82..17ba4b4 100644
--- a/gold/Makefile.am
+++ b/gold/Makefile.am
@@ -164,11 +164,12 @@ EXTRA_DIST = yyscript.c yyscript.h
TARGETSOURCES = \
i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc arm-reloc-property.cc tilegx.cc \
- mips.cc
+ mips.cc aarch64.cc
ALL_TARGETOBJS = \
i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT) \
- arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT) mips.$(OBJEXT)
+ arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT) \
+ mips.$(OBJEXT) aarch64.$(OBJEXT)
libgold_a_SOURCES = $(CCFILES) $(HFILES) $(YFILES) $(DEFFILES)
libgold_a_LIBADD = $(LIBOBJS)
diff --git a/gold/Makefile.in b/gold/Makefile.in
index 39a3952..e8d9efb 100644
--- a/gold/Makefile.in
+++ b/gold/Makefile.in
@@ -533,11 +533,12 @@ DEFFILES = arm-reloc.def
EXTRA_DIST = yyscript.c yyscript.h
TARGETSOURCES = \
i386.cc x86_64.cc sparc.cc powerpc.cc arm.cc arm-reloc-property.cc tilegx.cc \
- mips.cc
+ mips.cc aarch64.cc
ALL_TARGETOBJS = \
i386.$(OBJEXT) x86_64.$(OBJEXT) sparc.$(OBJEXT) powerpc.$(OBJEXT) \
- arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT) mips.$(OBJEXT)
+ arm.$(OBJEXT) arm-reloc-property.$(OBJEXT) tilegx.$(OBJEXT) \
+ mips.$(OBJEXT) aarch64.$(OBJEXT)
libgold_a_SOURCES = $(CCFILES) $(HFILES) $(YFILES) $(DEFFILES)
libgold_a_LIBADD = $(LIBOBJS)
diff --git a/gold/aarch64.cc b/gold/aarch64.cc
new file mode 100644
index 0000000..5e863e1
--- /dev/null
+++ b/gold/aarch64.cc
@@ -0,0 +1,1447 @@
+// aarch64.cc -- aarch64 target support for gold.
+
+// Copyright (C) 2006-2014 Free Software Foundation, Inc.
+// Written by Jing Yu <jingyu@google.com>.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#include "gold.h"
+
+#include <cstring>
+
+#include "elfcpp.h"
+#include "dwarf.h"
+#include "parameters.h"
+#include "reloc.h"
+#include "aarch64.h"
+#include "object.h"
+#include "symtab.h"
+#include "layout.h"
+#include "output.h"
+#include "copy-relocs.h"
+#include "target.h"
+#include "target-reloc.h"
+#include "target-select.h"
+#include "tls.h"
+#include "freebsd.h"
+#include "nacl.h"
+#include "gc.h"
+#include "icf.h"
+
+// The first three .got.plt entries are reserved.
+const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3;
+
+namespace
+{
+
+using namespace gold;
+
+template<int size, bool big_endian>
+class Output_data_plt_aarch64;
+
+template<int size, bool big_endian>
+class Output_data_plt_aarch64_standard;
+
+template<int size, bool big_endian>
+class Target_aarch64;
+
+// Output_data_got_aarch64 class.
+
+template<int size, bool big_endian>
+class Output_data_got_aarch64 : public Output_data_got<size, big_endian>
+{
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
+ Output_data_got_aarch64(Symbol_table* symtab, Layout* layout)
+ : Output_data_got<size, big_endian>(), layout_(layout)
+ { }
+
+ protected:
+ // Write out the GOT table.
+ void
+ do_write(Output_file* of) {
+ // The first entry in the GOT is the address of the .dynamic section.
+ gold_assert(this->data_size() >= size / 8);
+ Output_section* dynamic = this->layout_->dynamic_section();
+ Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
+ this->replace_constant(0, dynamic_addr);
+ Output_data_got<size, big_endian>::do_write(of);
+ }
+
+ private:
+ // A pointer to the Layout class, so that we can find the .dynamic
+ // section when we write out the GOT section.
+ Layout* layout_;
+};
+
+// The aarch64 target class.
+// See the ABI at
+// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
+template<int size, bool big_endian>
+class Target_aarch64 : public Sized_target<size, big_endian>
+{
+ public:
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
+ Reloc_section;
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+
+ Target_aarch64(const Target::Target_info* info = &aarch64_info)
+ : Sized_target<size, big_endian>(info),
+ got_(NULL), plt_(NULL), got_plt_(NULL),
+ global_offset_table_(NULL), rela_dyn_(NULL),
+ copy_relocs_(elfcpp::R_AARCH64_COPY)
+ { }
+
+ // Scan the relocations to determine unreferenced sections for
+ // garbage collection.
+ void
+ gc_process_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_symbols);
+
+ // Scan the relocations to look for symbol adjustments.
+ void
+ scan_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_symbols);
+
+ // Finalize the sections.
+ void
+ do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
+
+ // Relocate a section.
+ void
+ relocate_section(const Relocate_info<size, big_endian>*,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr view_address,
+ section_size_type view_size,
+ const Reloc_symbol_changes*);
+
+ // Scan the relocs during a relocatable link.
+ void
+ scan_relocatable_relocs(Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_symbols,
+ Relocatable_relocs*);
+
+ // Relocate a section during a relocatable link.
+ void
+ relocate_relocs(
+ const Relocate_info<size, big_endian>*,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
+ const Relocatable_relocs*,
+ unsigned char* view,
+ typename elfcpp::Elf_types<size>::Elf_Addr view_address,
+ section_size_type view_size,
+ unsigned char* reloc_view,
+ section_size_type reloc_view_size);
+
+ // Return the number of entries in the PLT.
+ unsigned int
+ plt_entry_count() const;
+
+ //Return the offset of the first non-reserved PLT entry.
+ unsigned int
+ first_plt_entry_offset() const;
+
+ // Return the size of each PLT entry.
+ unsigned int
+ plt_entry_size() const;
+
+ private:
+ // The class which scans relocations.
+ class Scan
+ {
+ public:
+ Scan()
+ : issued_non_pic_error_(false)
+ { }
+
+ static inline int
+ get_reference_flags(unsigned int r_type);
+
+ inline void
+ local(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
+ const elfcpp::Sym<size, big_endian>& lsym,
+ bool is_discarded);
+
+ inline void
+ global(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ Output_section* output_section,
+ const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
+ Symbol* gsym);
+
+ inline bool
+ local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
+ Target_aarch64<size, big_endian>* ,
+ Sized_relobj_file<size, big_endian>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, big_endian>& ,
+ unsigned int r_type,
+ const elfcpp::Sym<size, big_endian>&);
+
+ inline bool
+ global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
+ Target_aarch64<size, big_endian>* ,
+ Sized_relobj_file<size, big_endian>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, big_endian>& ,
+ unsigned int r_type,
+ Symbol* gsym);
+
+ private:
+ static void
+ unsupported_reloc_local(Sized_relobj_file<size, big_endian>*,
+ unsigned int r_type);
+
+ static void
+ unsupported_reloc_global(Sized_relobj_file<size, big_endian>*,
+ unsigned int r_type, Symbol*);
+
+ inline bool
+ possible_function_pointer_reloc(unsigned int r_type);
+
+ void
+ check_non_pic(Relobj*, unsigned int r_type);
+
+ // Whether we have issued an error about a non-PIC compilation.
+ bool issued_non_pic_error_;
+ };
+
+ // The class which implements relocation.
+ class Relocate
+ {
+ public:
+ Relocate()
+ { }
+
+ ~Relocate()
+ { }
+
+ // Do a relocation. Return false if the caller should not issue
+ // any warnings about this relocation.
+ inline bool
+ relocate(const Relocate_info<size, big_endian>*, Target_aarch64*,
+ Output_section*,
+ size_t relnum, const elfcpp::Rela<size, big_endian>&,
+ unsigned int r_type, const Sized_symbol<size>*,
+ const Symbol_value<size>*,
+ unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
+ section_size_type);
+
+ };
+
+ // A class which returns the size required for a relocation type,
+ // used while scanning relocs during a relocatable link.
+ class Relocatable_size_for_reloc
+ {
+ public:
+ unsigned int
+ get_size_for_reloc(unsigned int, Relobj*);
+ };
+
+ // Adjust TLS relocation type based on the options and whether this
+ // is a local symbol.
+ static tls::Tls_optimization
+ optimize_tls_reloc(bool is_final, int r_type);
+
+ // Get the GOT section, creating it if necessary.
+ Output_data_got_aarch64<size, big_endian>*
+ got_section(Symbol_table*, Layout*);
+
+ // Get the GOT PLT section.
+ Output_data_space*
+ got_plt_section() const
+ {
+ gold_assert(this->got_plt_ != NULL);
+ return this->got_plt_;
+ }
+
+ // Create the PLT section.
+ void
+ make_plt_section(Symbol_table* symtab, Layout* layout);
+
+ // Create a PLT entry for a global symbol.
+ void
+ make_plt_entry(Symbol_table*, Layout*, Symbol*);
+
+ // Get the PLT section.
+ Output_data_plt_aarch64<size, big_endian>*
+ plt_section() const
+ {
+ gold_assert(this->plt_ != NULL);
+ return this->plt_;
+ }
+
+ // Get the dynamic reloc section, creating it if necessary.
+ Reloc_section*
+ rela_dyn_section(Layout*);
+
+ // Add a potential copy relocation.
+ void
+ copy_reloc(Symbol_table* symtab, Layout* layout,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int shndx, Output_section* output_section,
+ Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
+ {
+ this->copy_relocs_.copy_reloc(symtab, layout,
+ symtab->get_sized_symbol<size>(sym),
+ object, shndx, output_section,
+ reloc, this->rela_dyn_section(layout));
+ }
+
+ // Information about this specific target which we pass to the
+ // general Target structure.
+ static const Target::Target_info aarch64_info;
+
+ // The types of GOT entries needed for this platform.
+ // These values are exposed to the ABI in an incremental link.
+ // Do not renumber existing values without changing the version
+ // number of the .gnu_incremental_inputs section.
+ enum Got_type
+ {
+ GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
+ GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
+ GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
+ GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
+ };
+
+ // The GOT section.
+ Output_data_got_aarch64<size, big_endian>* got_;
+ // The PLT section.
+ Output_data_plt_aarch64<size, big_endian>* plt_;
+ // The GOT PLT section.
+ Output_data_space* got_plt_;
+ // The _GLOBAL_OFFSET_TABLE_ symbol.
+ Symbol* global_offset_table_;
+ // The dynamic reloc section.
+ Reloc_section* rela_dyn_;
+ // Relocs saved to avoid a COPY reloc.
+ Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
+};
+
+template<>
+const Target::Target_info Target_aarch64<64, false>::aarch64_info =
+{
+ 64, // size
+ false, // is_big_endian
+ elfcpp::EM_AARCH64, // machine_code
+ false, // has_make_symbol
+ false, // has_resolve
+ false, // has_code_fill
+ true, // is_default_stack_executable
+ false, // can_icf_inline_merge_sections
+ '\0', // wrap_char
+ "/lib/ld.so.1", // program interpreter
+ 0x400000, // default_text_segment_address
+ 0x1000, // abi_pagesize (overridable by -z max-page-size)
+ 0x1000, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
+};
+
+template<>
+const Target::Target_info Target_aarch64<32, false>::aarch64_info =
+{
+ 32, // size
+ false, // is_big_endian
+ elfcpp::EM_AARCH64, // machine_code
+ false, // has_make_symbol
+ false, // has_resolve
+ false, // has_code_fill
+ true, // is_default_stack_executable
+ false, // can_icf_inline_merge_sections
+ '\0', // wrap_char
+ "/lib/ld.so.1", // program interpreter
+ 0x400000, // default_text_segment_address
+ 0x1000, // abi_pagesize (overridable by -z max-page-size)
+ 0x1000, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
+};
+
+template<>
+const Target::Target_info Target_aarch64<64, true>::aarch64_info =
+{
+ 64, // size
+ true, // is_big_endian
+ elfcpp::EM_AARCH64, // machine_code
+ false, // has_make_symbol
+ false, // has_resolve
+ false, // has_code_fill
+ true, // is_default_stack_executable
+ false, // can_icf_inline_merge_sections
+ '\0', // wrap_char
+ "/lib/ld.so.1", // program interpreter
+ 0x400000, // default_text_segment_address
+ 0x1000, // abi_pagesize (overridable by -z max-page-size)
+ 0x1000, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
+};
+
+template<>
+const Target::Target_info Target_aarch64<32, true>::aarch64_info =
+{
+ 32, // size
+ true, // is_big_endian
+ elfcpp::EM_AARCH64, // machine_code
+ false, // has_make_symbol
+ false, // has_resolve
+ false, // has_code_fill
+ true, // is_default_stack_executable
+ false, // can_icf_inline_merge_sections
+ '\0', // wrap_char
+ "/lib/ld.so.1", // program interpreter
+ 0x400000, // default_text_segment_address
+ 0x1000, // abi_pagesize (overridable by -z max-page-size)
+ 0x1000, // common_pagesize (overridable by -z common-page-size)
+ false, // isolate_execinstr
+ 0, // rosegment_gap
+ elfcpp::SHN_UNDEF, // small_common_shndx
+ elfcpp::SHN_UNDEF, // large_common_shndx
+ 0, // small_common_section_flags
+ 0, // large_common_section_flags
+ NULL, // attributes_section
+ NULL, // attributes_vendor
+ "_start" // entry_symbol_name
+};
+
+// Get the GOT section, creating it if necessary.
+
+template<int size, bool big_endian>
+Output_data_got_aarch64<size, big_endian>*
+Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab,
+ Layout* layout)
+{
+ if (this->got_ == NULL)
+ {
+ gold_assert(symtab != NULL && layout != NULL);
+
+ // When using -z now, we can treat .got.plt as a relro section.
+ // Without -z now, it is modified after program startup by lazy
+ // PLT relocations.
+ bool is_got_plt_relro = parameters->options().now();
+ Output_section_order got_order = (is_got_plt_relro
+ ? ORDER_RELRO
+ : ORDER_RELRO_LAST);
+ Output_section_order got_plt_order = (is_got_plt_relro
+ ? ORDER_RELRO
+ : ORDER_NON_RELRO_FIRST);
+
+ // Layout of .got and .got.plt sections.
+ // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
+ // ...
+ // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
+ // .gotplt[1] reserved for ld.so (resolver)
+ // .gotplt[2] reserved
+
+ // Generate .got section.
+ this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab,
+ layout);
+ layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
+ this->got_, got_order, true);
+ // The first word of GOT is reserved for the address of .dynamic.
+ // We put 0 here now. The value will be replaced later in
+ // Output_data_got_aarch64::do_write.
+ this->got_->add_constant(0);
+
+ // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
+ // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
+ // even if there is a .got.plt section.
+ this->global_offset_table_ =
+ symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
+ Symbol_table::PREDEFINED,
+ this->got_,
+ 0, 0, elfcpp::STT_OBJECT,
+ elfcpp::STB_LOCAL,
+ elfcpp::STV_HIDDEN, 0,
+ false, false);
+
+ // Generate .got.plt section.
+ this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT");
+ layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
+ (elfcpp::SHF_ALLOC
+ | elfcpp::SHF_WRITE),
+ this->got_plt_, got_plt_order,
+ is_got_plt_relro);
+
+ // The first three entries are reserved.
+ this->got_plt_->set_current_data_size
+ (AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
+
+ if (!is_got_plt_relro)
+ {
+ // Those bytes can go into the relro segment.
+ layout->increase_relro
+ (AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
+ }
+
+ }
+ return this->got_;
+}
+
+// Get the dynamic reloc section, creating it if necessary.
+
+template<int size, bool big_endian>
+typename Target_aarch64<size, big_endian>::Reloc_section*
+Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout)
+{
+ if (this->rela_dyn_ == NULL)
+ {
+ gold_assert(layout != NULL);
+ this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
+ layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, this->rela_dyn_,
+ ORDER_DYNAMIC_RELOCS, false);
+ }
+ return this->rela_dyn_;
+}
+
+// A class to handle the PLT data.
+// This is an abstract base class that handles most of the linker details
+// but does not know the actual contents of PLT entries. The derived
+// classes below fill in those details.
+
+template<int size, bool big_endian>
+class Output_data_plt_aarch64 : public Output_section_data
+{
+ public:
+ typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
+ Reloc_section;
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+
+ Output_data_plt_aarch64(Layout* layout,
+ uint64_t addralign,
+ Output_data_space* got_plt)
+ : Output_section_data(addralign),
+ got_plt_(got_plt),
+ count_(0)
+ { this->init(layout); }
+
+ // Initialize the PLT section.
+ void
+ init(Layout* layout);
+
+ // Add an entry to the PLT.
+ void
+ add_entry(Symbol* gsym);
+
+ // Return the .rela.plt section data.
+ Reloc_section*
+ rela_plt()
+ { return this->rel_; }
+
+ // Return the number of PLT entries.
+ unsigned int
+ entry_count() const
+ { return this->count_; }
+
+ // Return the offset of the first non-reserved PLT entry.
+ unsigned int
+ first_plt_entry_offset()
+ { return this->do_first_plt_entry_offset(); }
+
+ // Return the size of a PLT entry.
+ unsigned int
+ get_plt_entry_size() const
+ { return this->do_get_plt_entry_size(); }
+
+ protected:
+ // Fill in the first PLT entry.
+ void
+ fill_first_plt_entry(unsigned char* pov,
+ Address got_address,
+ Address plt_address)
+ { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
+
+ // Fill in a normal PLT entry.
+ void
+ fill_plt_entry(unsigned char* pov,
+ Address got_address,
+ Address plt_address,
+ unsigned int got_offset,
+ unsigned int plt_offset)
+ {
+ this->do_fill_plt_entry(pov, got_address, plt_address,
+ got_offset, plt_offset);
+ }
+
+ virtual unsigned int
+ do_first_plt_entry_offset() const = 0;
+
+ virtual unsigned int
+ do_get_plt_entry_size() const = 0;
+
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ Address got_addr,
+ Address plt_addr) = 0;
+
+ virtual void
+ do_fill_plt_entry(unsigned char* pov,
+ Address got_address,
+ Address plt_address,
+ unsigned int got_offset,
+ unsigned int plt_offset) = 0;
+
+ void
+ do_adjust_output_section(Output_section* os);
+
+ // Write to a map file.
+ void
+ do_print_to_mapfile(Mapfile* mapfile) const
+ { mapfile->print_output_data(this, _("** PLT")); }
+
+ private:
+ // Set the final size.
+ void
+ set_final_data_size();
+
+ // Write out the PLT data.
+ void
+ do_write(Output_file*);
+
+ // The reloc section.
+ Reloc_section* rel_;
+ // The .got section.
+ Output_data_got_aarch64<size, big_endian>* got_;
+ // The .got.plt section.
+ Output_data_space* got_plt_;
+ // The number of PLT entries.
+ unsigned int count_;
+};
+
+// Initialize the PLT section.
+
+template<int size, bool big_endian>
+void
+Output_data_plt_aarch64<size, big_endian>::init(Layout* layout)
+{
+ this->rel_ = new Reloc_section(false);
+ layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
+ elfcpp::SHF_ALLOC, this->rel_,
+ ORDER_DYNAMIC_PLT_RELOCS, false);
+}
+
+template<int size, bool big_endian>
+void
+Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section(
+ Output_section* os)
+{
+ os->set_entsize(this->get_plt_entry_size());
+}
+
+// Add an entry to the PLT.
+
+template<int size, bool big_endian>
+void
+Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol* gsym)
+{
+ gold_assert(!gsym->has_plt_offset());
+ //TODO
+}
+
+// Set the final size.
+template<int size, bool big_endian>
+void
+Output_data_plt_aarch64<size, big_endian>::set_final_data_size()
+{
+ this->set_data_size(this->first_plt_entry_offset()
+ + this->count * this->get_plt_entry_size());
+}
+
+template<int size, bool big_endian>
+class Output_data_plt_aarch64_standard :
+ public Output_data_plt_aarch64<size, big_endian>
+{
+ public:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+ Output_data_plt_aarch64_standard(Layout* layout, Output_data_space* got_plt)
+ : Output_data_plt_aarch64<size, big_endian>(layout,
+ size == 32 ? 4 : 8,
+ got_plt)
+ { }
+
+ protected:
+ // Return the offset of the first non-reserved PLT entry.
+ virtual unsigned int
+ do_first_plt_entry_offset() const
+ { return this->first_plt_entry_size; }
+
+ // Return the size of a PLT entry
+ virtual unsigned int
+ do_get_plt_entry_size() const
+ { return this->plt_entry_size; }
+
+ virtual void
+ do_fill_first_plt_entry(unsigned char* pov,
+ Address got_address,
+ Address plt_address);
+
+ virtual void
+ do_fill_plt_entry(unsigned char* pov,
+ Address got_address,
+ Address plt_address,
+ unsigned int got_offset,
+ unsigned int plt_offset);
+
+ private:
+ // The size of the first plt entry size.
+ static const int first_plt_entry_size = 32;
+ // The size of the plt entry size.
+ static const int plt_entry_size = 16;
+ // Template for the first PLT entry.
+ static const uint32_t first_plt_entry[first_plt_entry_size / 4];
+ // Template for subsequent PLT entries.
+ static const uint32_t plt_entry[plt_entry_size / 4];
+};
+
+// The first entry in the PLT for an executable.
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<32, false>::
+ first_plt_entry[first_plt_entry_size / 4] =
+{
+ 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
+ 0x90000010, /* adrp x16, PLT_GOT+16 */
+ 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
+ 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
+ 0xd61f0220, /* br x17 */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+};
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<32, true>::
+ first_plt_entry[first_plt_entry_size / 4] =
+{
+ 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
+ 0x90000010, /* adrp x16, PLT_GOT+16 */
+ 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
+ 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
+ 0xd61f0220, /* br x17 */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+};
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<64, false>::
+ first_plt_entry[first_plt_entry_size / 4] =
+{
+ 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
+ 0x90000010, /* adrp x16, PLT_GOT+16 */
+ 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
+ 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
+ 0xd61f0220, /* br x17 */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+};
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<64, true>::
+ first_plt_entry[first_plt_entry_size / 4] =
+{
+ 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
+ 0x90000010, /* adrp x16, PLT_GOT+16 */
+ 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
+ 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
+ 0xd61f0220, /* br x17 */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+ 0xd503201f, /* nop */
+};
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<32, false>::
+ plt_entry[plt_entry_size / 4] =
+{
+ 0x90000010, /* adrp x16, PLTGOT + n * 8 */
+ 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 8] */
+ 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
+ 0xd61f0220, /* br x17. */
+};
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<32, true>::
+ plt_entry[plt_entry_size / 4] =
+{
+ 0x90000010, /* adrp x16, PLTGOT + n * 8 */
+ 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 8] */
+ 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
+ 0xd61f0220, /* br x17. */
+};
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<64, false>::
+ plt_entry[plt_entry_size / 4] =
+{
+ 0x90000010, /* adrp x16, PLTGOT + n * 8 */
+ 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
+ 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 4 */
+ 0xd61f0220, /* br x17. */
+};
+
+template<>
+const uint32_t
+Output_data_plt_aarch64_standard<64, true>::
+ plt_entry[plt_entry_size / 4] =
+{
+ 0x90000010, /* adrp x16, PLTGOT + n * 8 */
+ 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
+ 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 4 */
+ 0xd61f0220, /* br x17. */
+};
+
+template<int size, bool big_endian>
+void
+Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry(
+ unsigned char* pov,
+ Address /* got_address */,
+ Address /* plt_address */)
+{
+ // PLT0 of the small PLT looks like this in ELF64 -
+ // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
+ // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
+ // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
+ // symbol resolver
+ // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
+ // GOTPLT entry for this.
+ // br x17
+ // PLT0 will be slightly different in ELF32 due to different got entry
+ // size.
+ memcpy(pov, this->first_plt_entry, this->first_plt_entry_size);
+ // TODO
+}
+
+// Subsequent entries in the PLT for an executable.
+
+template<int size, bool big_endian>
+void
+Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry(
+ unsigned char* pov,
+ Address /* got_address*/,
+ Address /* plt_address */,
+ unsigned int /* got_offset */,
+ unsigned int /* plt_offset */)
+{
+ memcpy(pov, this->plt_entry, this->plt_entry_size);
+ //TODO
+}
+
+// Write out the PLT. This uses the hand-coded instructions above,
+// and adjusts them as needed. This is specified by the AMD64 ABI.
+
+template<int size, bool big_endian>
+void
+Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of)
+{
+ const off_t offset = this->offset();
+ const section_size_type oview_size =
+ convert_to_section_size_type(this->data_size());
+ unsigned char* const oview = of->get_output_view(offset, oview_size);
+
+ const off_t got_file_offset = this->got_plt_->offset();
+ const section_size_type got_size =
+ convert_to_section_size_type(this->got_plt_->data_size());
+ unsigned char* const got_view = of->get_output_view(got_file_offset,
+ got_size);
+
+ unsigned char* pov = oview;
+
+ // The base address of the .plt section.
+ typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
+ // The base address of the .got section.
+ typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
+ // The base address of the PLT portion of the .got section.
+ typename elfcpp::Elf_types<size>::Elf_Addr got_address
+ = this->got_plt_->address();
+
+ this->fill_first_plt_entry(pov, got_address, plt_address);
+ pov += this->first_plt_entry_offset();
+
+ // The first three entries in .got.plt are reserved.
+ unsigned char* got_pov = got_view;
+ memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT);
+ got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
+
+ unsigned int plt_offset = this->first_plt_entry_offset();
+ unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
+ const unsigned int count = this->count_;
+ for (unsigned int plt_index = 0;
+ plt_index < count;
+ ++plt_index,
+ pov += this->get_plt_entry_size(),
+ got_pov += size / 8,
+ plt_offset += this->get_plt_entry_size(),
+ got_offset += size / 8)
+ {
+ // Set and adjust the PLT entry itself.
+ this->fill_plt_entry(pov, got_address, plt_address,
+ got_offset, plt_offset);
+
+ // Set the entry in the GOT.
+ elfcpp::Swap<size, big_endian>::writeval(got_pov,
+ plt_address + plt_offset);
+ }
+
+ gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
+ gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
+
+ of->write_output_view(offset, oview_size, oview);
+ of->write_output_view(got_file_offset, got_size, got_view);
+}
+
+// Return the number of entries in the PLT.
+
+template<int size, bool big_endian>
+unsigned int
+Target_aarch64<size, big_endian>::plt_entry_count() const
+{
+ if (this->plt_ == NULL)
+ return 0;
+ return this->plt_->entry_count();
+}
+
+// Return the offset of the first non-reserved PLT entry.
+
+template<int size, bool big_endian>
+unsigned int
+Target_aarch64<size, big_endian>::first_plt_entry_offset() const
+{
+ return this->plt_->first_plt_entry_offset();
+}
+
+// Return the size of each PLT entry.
+
+template<int size, bool big_endian>
+unsigned int
+Target_aarch64<size, big_endian>::plt_entry_size() const
+{
+ return this->plt_->get_plt_entry_size();
+}
+
+// Optimize the TLS relocation type based on what we know about the
+// symbol. IS_FINAL is true if the final address of this symbol is
+// known at link time.
+
+template<int size, bool big_endian>
+tls::Tls_optimization
+Target_aarch64<size, big_endian>::optimize_tls_reloc(bool /* is_final */,
+ int /* r_type */)
+{
+ //TODO
+ return tls::TLSOPT_NONE;
+}
+
+// Get the Reference_flags for a particular relocation.
+template<int size, bool big_endian>
+int
+Target_aarch64<size, big_endian>::Scan::get_reference_flags(unsigned int r_type)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_AARCH64_NONE:
+ // No symbol reference.
+ return 0;
+ //TODO
+ default:
+ // Not expected. We will give an error later.
+ return 0;
+ }
+}
+
+// Returns true if this relocation type could be that of a function pointer.
+
+template<int size, bool big_endian>
+inline bool
+Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc(
+ unsigned int r_type)
+{
+ switch (r_type)
+ {
+ case elfcpp::R_AARCH64_ABS64:
+ //TODO
+ {
+ return true;
+ }
+ }
+ return false;
+}
+
+// For safe ICF, scan a relocation for a local symbol to check if it
+// corresponds to a function pointer being taken. In that case mark
+// the function whose pointer was taken as not foldable.
+
+template<int size, bool big_endian>
+inline bool
+Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer(
+ Symbol_table* ,
+ Layout* ,
+ Target_aarch64<size, big_endian>* ,
+ Sized_relobj_file<size, big_endian>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, big_endian>& ,
+ unsigned int r_type,
+ const elfcpp::Sym<size, big_endian>&)
+{
+ // When building a shared library, do not fold any local symbols as it is
+ // not possible to distinguish pointer taken versus a call by looking at
+ // the relocation types.
+ return (parameters->options().shared()
+ || possible_function_pointer_reloc(r_type));
+}
+
+// For safe ICF, scan a relocation for a global symbol to check if it
+// corresponds to a function pointer being taken. In that case mark
+// the function whose pointer was taken as not foldable.
+
+template<int size, bool big_endian>
+inline bool
+Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer(
+ Symbol_table* ,
+ Layout* ,
+ Target_aarch64<size, big_endian>* ,
+ Sized_relobj_file<size, big_endian>* ,
+ unsigned int ,
+ Output_section* ,
+ const elfcpp::Rela<size, big_endian>& ,
+ unsigned int r_type,
+ Symbol* gsym)
+{
+ // When building a shared library, do not fold symbols whose visibility
+ // is hidden, internal or protected.
+ return ((parameters->options().shared()
+ && (gsym->visibility() == elfcpp::STV_INTERNAL
+ || gsym->visibility() == elfcpp::STV_PROTECTED
+ || gsym->visibility() == elfcpp::STV_HIDDEN))
+ || possible_function_pointer_reloc(r_type));
+}
+
+// Report an unsupported relocation against a local symbol.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local(
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int r_type)
+{
+ gold_error(_("%s: unsupported reloc %u against local symbol"),
+ object->name().c_str(), r_type);
+}
+
+// We are about to emit a dynamic relocation of type R_TYPE. If the
+// dynamic linker does not support it, issue an error.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object,
+ unsigned int r_type)
+{
+ gold_assert(r_type != elfcpp::R_AARCH64_NONE);
+
+ switch (r_type)
+ {
+ // These are the relocation types supported by glibc for AARCH64.
+ case elfcpp::R_AARCH64_NONE:
+ case elfcpp::R_AARCH64_COPY:
+ case elfcpp::R_AARCH64_GLOB_DAT:
+ case elfcpp::R_AARCH64_JUMP_SLOT:
+ case elfcpp::R_AARCH64_RELATIVE:
+ case elfcpp::R_AARCH64_TLS_DTPREL64:
+ case elfcpp::R_AARCH64_TLS_DTPMOD64:
+ case elfcpp::R_AARCH64_TLS_TPREL64:
+ case elfcpp::R_AARCH64_TLSDESC:
+ case elfcpp::R_AARCH64_IRELATIVE:
+ case elfcpp::R_AARCH64_ABS32:
+ case elfcpp::R_AARCH64_ABS64:
+ return;
+
+ default:
+ break;
+ }
+
+ // This prevents us from issuing more than one error per reloc
+ // section. But we can still wind up issuing more than one
+ // error per object file.
+ if (this->issued_non_pic_error_)
+ return;
+ gold_assert(parameters->options().output_is_position_independent());
+ object->error(_("requires unsupported dynamic reloc; "
+ "recompile with -fPIC"));
+ this->issued_non_pic_error_ = true;
+ return;
+}
+
+// Scan a relocation for a local symbol.
+
+template<int size, bool big_endian>
+inline void
+Target_aarch64<size, big_endian>::Scan::local(
+ Symbol_table* /* symtab */,
+ Layout* /* layout */,
+ Target_aarch64<size, big_endian>* /* target */,
+ Sized_relobj_file<size, big_endian>* /* object */,
+ unsigned int /* data_shndx */,
+ Output_section* /* output_section */,
+ const elfcpp::Rela<size, big_endian>& /* reloc */,
+ unsigned int r_type,
+ const elfcpp::Sym<size, big_endian>& /* lsym */,
+ bool is_discarded)
+{
+ if (is_discarded)
+ return;
+
+ switch (r_type)
+ {
+ case elfcpp::R_AARCH64_NONE:
+ break;
+
+ //TODO
+ }
+}
+
+
+// Report an unsupported relocation against a global symbol.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global(
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int r_type,
+ Symbol* gsym)
+{
+ gold_error(_("%s: unsupported reloc %u against global symbol %s"),
+ object->name().c_str(), r_type, gsym->demangled_name().c_str());
+}
+
+template<int size, bool big_endian>
+inline void
+Target_aarch64<size, big_endian>::Scan::global(
+ Symbol_table* /* symtab */,
+ Layout* /* layout */,
+ Target_aarch64<size, big_endian>* /* target */,
+ Sized_relobj_file<size, big_endian>* /* object */,
+ unsigned int /* data_shndx */,
+ Output_section* /* output_section */,
+ const elfcpp::Rela<size, big_endian>& /* reloc */,
+ unsigned int /* r_type */,
+ Symbol* /* gsym */)
+{
+ //TODO
+ return;
+}
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::gc_process_relocs(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_symbols)
+{
+ if (sh_type == elfcpp::SHT_REL)
+ {
+ return;
+ }
+
+ gold::gc_process_relocs<size, big_endian,
+ Target_aarch64<size, big_endian>,
+ elfcpp::SHT_RELA,
+ typename Target_aarch64<size, big_endian>::Scan,
+ typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>(
+ symtab,
+ layout,
+ this,
+ object,
+ data_shndx,
+ prelocs,
+ reloc_count,
+ output_section,
+ needs_special_offset_handling,
+ local_symbol_count,
+ plocal_symbols);
+}
+
+// Scan relocations for a section.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::scan_relocs(
+ Symbol_table* symtab,
+ Layout* layout,
+ Sized_relobj_file<size, big_endian>* object,
+ unsigned int data_shndx,
+ unsigned int sh_type,
+ const unsigned char* prelocs,
+ size_t reloc_count,
+ Output_section* output_section,
+ bool needs_special_offset_handling,
+ size_t local_symbol_count,
+ const unsigned char* plocal_symbols)
+{
+ if (sh_type == elfcpp::SHT_REL)
+ {
+ gold_error(_("%s: unsupported REL reloc section"),
+ object->name().c_str());
+ return;
+ }
+
+ gold::scan_relocs<size, big_endian, Target_aarch64<size, big_endian>,
+ elfcpp::SHT_RELA,
+ typename Target_aarch64<size, big_endian>::Scan>(
+ symtab,
+ layout,
+ this,
+ object,
+ data_shndx,
+ prelocs,
+ reloc_count,
+ output_section,
+ needs_special_offset_handling,
+ local_symbol_count,
+ plocal_symbols);
+}
+
+// Finalize the sections.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::do_finalize_sections(
+ Layout* /* layout */,
+ const Input_objects*,
+ Symbol_table* /* symtab */)
+{
+ //TODO
+ return;
+}
+
+// Perform a relocation.
+
+template<int size, bool big_endian>
+inline bool
+Target_aarch64<size, big_endian>::Relocate::relocate(
+ const Relocate_info<size, big_endian>* /* relinfo */,
+ Target_aarch64<size, big_endian>* /* target */,
+ Output_section* ,
+ size_t /* relnum */,
+ const elfcpp::Rela<size, big_endian>& /* rela */,
+ unsigned int /* r_type */,
+ const Sized_symbol<size>* /* gsym */,
+ const Symbol_value<size>* /* psymval */,
+ unsigned char* /* view */,
+ typename elfcpp::Elf_types<size>::Elf_Addr /* address */,
+ section_size_type /* view_size */)
+{
+ //TODO
+ return true;
+}
+
+// Relocate section data.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::relocate_section(
+ const Relocate_info<size, big_endian>* /* relinfo */,
+ unsigned int sh_type,
+ const unsigned char* /* prelocs */,
+ size_t /* reloc_count */,
+ Output_section* /* output_section */,
+ bool /*needs_special_offset_handling */,
+ unsigned char* /* view */,
+ typename elfcpp::Elf_types<size>::Elf_Addr /* address */,
+ section_size_type /* view_size */,
+ const Reloc_symbol_changes* /* reloc_symbol_changes */)
+{
+ //TODO
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+}
+
+// Return the size of a relocation while scanning during a relocatable
+// link.
+
+template<int size, bool big_endian>
+unsigned int
+Target_aarch64<size, big_endian>::Relocatable_size_for_reloc::
+get_size_for_reloc(
+ unsigned int ,
+ Relobj* )
+{
+ // We will never support SHT_REL relocations.
+ gold_unreachable();
+ return 0;
+}
+
+// Scan the relocs during a relocatable link.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::scan_relocatable_relocs(
+ Symbol_table* /* symtab */,
+ Layout* /* layout */,
+ Sized_relobj_file<size, big_endian>* /* object */,
+ unsigned int /* data_shndx */,
+ unsigned int sh_type,
+ const unsigned char* /* prelocs */,
+ size_t /* reloc_count */,
+ Output_section* /* output_section */,
+ bool /* needs_special_offset_handling */,
+ size_t /* local_symbol_count */,
+ const unsigned char* /* plocal_symbols */,
+ Relocatable_relocs* /* rr */)
+{
+ //TODO
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+}
+
+// Relocate a section during a relocatable link.
+
+template<int size, bool big_endian>
+void
+Target_aarch64<size, big_endian>::relocate_relocs(
+ const Relocate_info<size, big_endian>* /* relinfo */,
+ unsigned int sh_type,
+ const unsigned char* /* prelocs */,
+ size_t /* reloc_count */,
+ Output_section* /* output_section */,
+ typename elfcpp::Elf_types<size>::Elf_Off /* offset_in_output_section */,
+ const Relocatable_relocs* /* rr */,
+ unsigned char* /* view */,
+ typename elfcpp::Elf_types<size>::Elf_Addr /* view_address */,
+ section_size_type /* view_size */,
+ unsigned char* /* reloc_view */,
+ section_size_type /* reloc_view_size */)
+{
+ //TODO
+ gold_assert(sh_type == elfcpp::SHT_RELA);
+}
+
+
+// The selector for aarch64 object files.
+
+template<int size, bool big_endian>
+class Target_selector_aarch64 : public Target_selector
+{
+ public:
+ Target_selector_aarch64()
+ : Target_selector(elfcpp::EM_AARCH64, size, big_endian,
+ (size == 64
+ ? (big_endian ? "elf64-bigaarch64"
+ : "elf64-littleaarch64")
+ : (big_endian ? "elf32-bigaarch64"
+ : "elf32-littleaarch64")),
+ (size == 64
+ ? (big_endian ? "aarch64_elf64_be_vec"
+ : "aarch64_elf64_le_vec")
+ : (big_endian ? "aarch64_elf32_be_vec"
+ : "aarch64_elf32_le_vec")))
+ { }
+
+ virtual Target*
+ do_instantiate_target()
+ { return new Target_aarch64<size, big_endian>(); }
+};
+
+Target_selector_aarch64<32, true> target_selector_aarch64elf32b;
+Target_selector_aarch64<32, false> target_selector_aarch64elf32;
+Target_selector_aarch64<64, true> target_selector_aarch64elfb;
+Target_selector_aarch64<64, false> target_selector_aarch64elf;
+
+
+} // End anonymous namespace.
diff --git a/gold/configure b/gold/configure
index 9880635..7d7b849 100755
--- a/gold/configure
+++ b/gold/configure
@@ -698,6 +698,8 @@ DEFAULT_TARGET_I386_FALSE
DEFAULT_TARGET_I386_TRUE
DEFAULT_TARGET_ARM_FALSE
DEFAULT_TARGET_ARM_TRUE
+DEFAULT_TARGET_AARCH64_FALSE
+DEFAULT_TARGET_AARCH64_TRUE
PLUGINS_FALSE
PLUGINS_TRUE
THREADS_FALSE
@@ -3433,6 +3435,14 @@ for targ in $target $canon_targets; do
default_big_endian=$targ_big_endian
default_osabi=$targ_osabi
+ if test "$targ_obj" = "aarch64"; then
+ DEFAULT_TARGET_AARCH64_TRUE=
+ DEFAULT_TARGET_AARCH64_FALSE='#'
+else
+ DEFAULT_TARGET_AARCH64_TRUE='#'
+ DEFAULT_TARGET_AARCH64_FALSE=
+fi
+
if test "$targ_obj" = "arm"; then
DEFAULT_TARGET_ARM_TRUE=
DEFAULT_TARGET_ARM_FALSE='#'
@@ -7777,6 +7787,10 @@ if test -z "${PLUGINS_TRUE}" && test -z "${PLUGINS_FALSE}"; then
as_fn_error "conditional \"PLUGINS\" was never defined.
Usually this means the macro was only invoked conditionally." "$LINENO" 5
fi
+if test -z "${DEFAULT_TARGET_AARCH64_TRUE}" && test -z "${DEFAULT_TARGET_AARCH64_FALSE}"; then
+ as_fn_error "conditional \"DEFAULT_TARGET_AARCH64\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
if test -z "${DEFAULT_TARGET_ARM_TRUE}" && test -z "${DEFAULT_TARGET_ARM_FALSE}"; then
as_fn_error "conditional \"DEFAULT_TARGET_ARM\" was never defined.
Usually this means the macro was only invoked conditionally." "$LINENO" 5
diff --git a/gold/configure.ac b/gold/configure.ac
index 14ecd72..0478011 100644
--- a/gold/configure.ac
+++ b/gold/configure.ac
@@ -199,6 +199,7 @@ for targ in $target $canon_targets; do
default_big_endian=$targ_big_endian
default_osabi=$targ_osabi
+ AM_CONDITIONAL(DEFAULT_TARGET_AARCH64, test "$targ_obj" = "aarch64")
AM_CONDITIONAL(DEFAULT_TARGET_ARM, test "$targ_obj" = "arm")
AM_CONDITIONAL(DEFAULT_TARGET_I386, test "$targ_obj" = "i386")
AM_CONDITIONAL(DEFAULT_TARGET_POWERPC, test "$targ_obj" = "powerpc")
diff --git a/gold/configure.tgt b/gold/configure.tgt
index 93d622d..eaf164b 100644
--- a/gold/configure.tgt
+++ b/gold/configure.tgt
@@ -144,6 +144,14 @@ arm*-*-*)
targ_big_endian=false
targ_extra_big_endian=true
;;
+aarch64-*)
+ targ_obj=aarch64
+ targ_machine=EM_AARCH64
+ targ_size=64
+ targ_extra_size=32
+ targ_big_endian=false
+ targ_extra_big_endian=true
+ ;;
mips*el*-*-*|mips*le*-*-*)
targ_obj=mips
targ_machine=EM_MIPS_RS3_LE