GDB 7.6.50

bfd/elfxx-aarch64.c

Index: bfd/elfxx-aarch64.c
diff --git a/bfd/elfxx-aarch64.c b/bfd/elfxx-aarch64.c
new file mode 100644
index 0000000000000000000000000000000000000000..129319dd0fea5fa035cb1d1963ed09ccd02ee82b
--- /dev/null
+++ b/bfd/elfxx-aarch64.c
@@ -0,0 +1,522 @@
+/* AArch64-specific support for ELF.
+   Copyright 2009-2013  Free Software Foundation, Inc.
+   Contributed by ARM Ltd.
+
+   This file is part of BFD, the Binary File Descriptor library.
+
+   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; see the file COPYING3. If not,
+   see <http://www.gnu.org/licenses/>.  */
+
+#include "sysdep.h"
+#include "elfxx-aarch64.h"
+
+#define MASK(n) ((1u << (n)) - 1)
+
+/* Decode the 26-bit offset of unconditional branch.  */
+static inline uint32_t
+decode_branch_ofs_26 (uint32_t insn)
+{
+  return insn & MASK (26);
+}
+
+/* Decode the 19-bit offset of conditional branch and compare & branch.  */
+static inline uint32_t
+decode_cond_branch_ofs_19 (uint32_t insn)
+{
+  return (insn >> 5) & MASK (19);
+}
+
+/* Decode the 19-bit offset of load literal.  */
+static inline uint32_t
+decode_ld_lit_ofs_19 (uint32_t insn)
+{
+  return (insn >> 5) & MASK (19);
+}
+
+/* Decode the 14-bit offset of test & branch.  */
+static inline uint32_t
+decode_tst_branch_ofs_14 (uint32_t insn)
+{
+  return (insn >> 5) & MASK (14);
+}
+
+/* Decode the 16-bit imm of move wide.  */
+static inline uint32_t
+decode_movw_imm (uint32_t insn)
+{
+  return (insn >> 5) & MASK (16);
+}
+
+/* Decode the 12-bit imm of add immediate.  */
+static inline uint32_t
+decode_add_imm (uint32_t insn)
+{
+  return (insn >> 10) & MASK (12);
+}
+
+/* Reencode the imm field of add immediate.  */
+static inline uint32_t
+reencode_add_imm (uint32_t insn, uint32_t imm)
+{
+  return (insn & ~(MASK (12) << 10)) | ((imm & MASK (12)) << 10);
+}
+
+/* Reencode the imm field of adr.  */
+static inline uint32_t
+reencode_adr_imm (uint32_t insn, uint32_t imm)
+{
+  return (insn & ~((MASK (2) << 29) | (MASK (19) << 5)))
+    | ((imm & MASK (2)) << 29) | ((imm & (MASK (19) << 2)) << 3);
+}
+
+/* Reencode the imm field of ld/st pos immediate.  */
+static inline uint32_t
+reencode_ldst_pos_imm (uint32_t insn, uint32_t imm)
+{
+  return (insn & ~(MASK (12) << 10)) | ((imm & MASK (12)) << 10);
+}
+
+/* Encode the 26-bit offset of unconditional branch.  */
+static inline uint32_t
+reencode_branch_ofs_26 (uint32_t insn, uint32_t ofs)
+{
+  return (insn & ~MASK (26)) | (ofs & MASK (26));
+}
+
+/* Encode the 19-bit offset of conditional branch and compare & branch.  */
+static inline uint32_t
+reencode_cond_branch_ofs_19 (uint32_t insn, uint32_t ofs)
+{
+  return (insn & ~(MASK (19) << 5)) | ((ofs & MASK (19)) << 5);
+}
+
+/* Decode the 19-bit offset of load literal.  */
+static inline uint32_t
+reencode_ld_lit_ofs_19 (uint32_t insn, uint32_t ofs)
+{
+  return (insn & ~(MASK (19) << 5)) | ((ofs & MASK (19)) << 5);
+}
+
+/* Encode the 14-bit offset of test & branch.  */
+static inline uint32_t
+reencode_tst_branch_ofs_14 (uint32_t insn, uint32_t ofs)
+{
+  return (insn & ~(MASK (14) << 5)) | ((ofs & MASK (14)) << 5);
+}
+
+/* Reencode the imm field of move wide.  */
+static inline uint32_t
+reencode_movw_imm (uint32_t insn, uint32_t imm)
+{
+  return (insn & ~(MASK (16) << 5)) | ((imm & MASK (16)) << 5);
+}
+
+/* Reencode mov[zn] to movz.  */
+static inline uint32_t
+reencode_movzn_to_movz (uint32_t opcode)
+{
+  return opcode | (1 << 30);
+}
+
+/* Reencode mov[zn] to movn.  */
+static inline uint32_t
+reencode_movzn_to_movn (uint32_t opcode)
+{
+  return opcode & ~(1 << 30);
+}
+
+/* Return non-zero if the indicated VALUE has overflowed the maximum
+   range expressible by a unsigned number with the indicated number of
+   BITS.  */
+
+static bfd_reloc_status_type
+aarch64_unsigned_overflow (bfd_vma value, unsigned int bits)
+{
+  bfd_vma lim;
+  if (bits >= sizeof (bfd_vma) * 8)
+    return bfd_reloc_ok;
+  lim = (bfd_vma) 1 << bits;
+  if (value >= lim)
+    return bfd_reloc_overflow;
+  return bfd_reloc_ok;
+}
+
+/* Return non-zero if the indicated VALUE has overflowed the maximum
+   range expressible by an signed number with the indicated number of
+   BITS.  */
+
+static bfd_reloc_status_type
+aarch64_signed_overflow (bfd_vma value, unsigned int bits)
+{
+  bfd_signed_vma svalue = (bfd_signed_vma) value;
+  bfd_signed_vma lim;
+
+  if (bits >= sizeof (bfd_vma) * 8)
+    return bfd_reloc_ok;
+  lim = (bfd_signed_vma) 1 << (bits - 1);
+  if (svalue < -lim || svalue >= lim)
+    return bfd_reloc_overflow;
+  return bfd_reloc_ok;
+}
+
+/* Insert the addend/value into the instruction or data object being
+   relocated.  */
+bfd_reloc_status_type
+_bfd_aarch64_elf_put_addend (bfd *abfd,
+			     bfd_byte *address, bfd_reloc_code_real_type r_type,
+			     reloc_howto_type *howto, bfd_signed_vma addend)
+{
+  bfd_reloc_status_type status = bfd_reloc_ok;
+  bfd_signed_vma old_addend = addend;
+  bfd_vma contents;
+  int size;
+
+  size = bfd_get_reloc_size (howto);
+  switch (size)
+    {
+    case 2:
+      contents = bfd_get_16 (abfd, address);
+      break;
+    case 4:
+      if (howto->src_mask != 0xffffffff)
+	/* Must be 32-bit instruction, always little-endian.  */
+	contents = bfd_getl32 (address);
+      else
+	/* Must be 32-bit data (endianness dependent).  */
+	contents = bfd_get_32 (abfd, address);
+      break;
+    case 8:
+      contents = bfd_get_64 (abfd, address);
+      break;
+    default:
+      abort ();
+    }
+
+  switch (howto->complain_on_overflow)
+    {
+    case complain_overflow_dont:
+      break;
+    case complain_overflow_signed:
+      status = aarch64_signed_overflow (addend,
+					howto->bitsize + howto->rightshift);
+      break;
+    case complain_overflow_unsigned:
+      status = aarch64_unsigned_overflow (addend,
+					  howto->bitsize + howto->rightshift);
+      break;
+    case complain_overflow_bitfield:
+    default:
+      abort ();
+    }
+
+  addend >>= howto->rightshift;
+
+  switch (r_type)
+    {
+    case BFD_RELOC_AARCH64_JUMP26:
+    case BFD_RELOC_AARCH64_CALL26:
+      contents = reencode_branch_ofs_26 (contents, addend);
+      break;
+
+    case BFD_RELOC_AARCH64_BRANCH19:
+      contents = reencode_cond_branch_ofs_19 (contents, addend);
+      break;
+
+    case BFD_RELOC_AARCH64_TSTBR14:
+      contents = reencode_tst_branch_ofs_14 (contents, addend);
+      break;
+
+    case BFD_RELOC_AARCH64_LD_LO19_PCREL:
+    case BFD_RELOC_AARCH64_GOT_LD_PREL19:
+      if (old_addend & ((1 << howto->rightshift) - 1))
+	return bfd_reloc_overflow;
+      contents = reencode_ld_lit_ofs_19 (contents, addend);
+      break;
+
+    case BFD_RELOC_AARCH64_TLSDESC_CALL:
+      break;
+
+    case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
+    case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
+    case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
+    case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
+    case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
+    case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
+    case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
+      contents = reencode_adr_imm (contents, addend);
+      break;
+
+    case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
+    case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
+    case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12_NC:
+    case BFD_RELOC_AARCH64_ADD_LO12:
+      /* Corresponds to: add rd, rn, #uimm12 to provide the low order
+         12 bits of the page offset following
+         BFD_RELOC_AARCH64_ADR_HI21_PCREL which computes the
+         (pc-relative) page base.  */
+      contents = reencode_add_imm (contents, addend);
+      break;
+
+    case BFD_RELOC_AARCH64_LDST8_LO12:
+    case BFD_RELOC_AARCH64_LDST16_LO12:
+    case BFD_RELOC_AARCH64_LDST32_LO12:
+    case BFD_RELOC_AARCH64_LDST64_LO12:
+    case BFD_RELOC_AARCH64_LDST128_LO12:
+    case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
+    case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
+    case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
+      if (old_addend & ((1 << howto->rightshift) - 1))
+	return bfd_reloc_overflow;
+      /* Used for ldr*|str* rt, [rn, #uimm12] to provide the low order
+         12 bits of the page offset following BFD_RELOC_AARCH64_ADR_HI21_PCREL
+         which computes the (pc-relative) page base.  */
+      contents = reencode_ldst_pos_imm (contents, addend);
+      break;
+
+      /* Group relocations to create high bits of a 16, 32, 48 or 64
+         bit signed data or abs address inline. Will change
+         instruction to MOVN or MOVZ depending on sign of calculated
+         value.  */
+
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
+    case BFD_RELOC_AARCH64_MOVW_G0_S:
+    case BFD_RELOC_AARCH64_MOVW_G1_S:
+    case BFD_RELOC_AARCH64_MOVW_G2_S:
+      /* NOTE: We can only come here with movz or movn.  */
+      if (addend < 0)
+	{
+	  /* Force use of MOVN.  */
+	  addend = ~addend;
+	  contents = reencode_movzn_to_movn (contents);
+	}
+      else
+	{
+	  /* Force use of MOVZ.  */
+	  contents = reencode_movzn_to_movz (contents);
+	}
+      /* fall through */
+
+      /* Group relocations to create a 16, 32, 48 or 64 bit unsigned
+         data or abs address inline.  */
+
+    case BFD_RELOC_AARCH64_MOVW_G0:
+    case BFD_RELOC_AARCH64_MOVW_G0_NC:
+    case BFD_RELOC_AARCH64_MOVW_G1:
+    case BFD_RELOC_AARCH64_MOVW_G1_NC:
+    case BFD_RELOC_AARCH64_MOVW_G2:
+    case BFD_RELOC_AARCH64_MOVW_G2_NC:
+    case BFD_RELOC_AARCH64_MOVW_G3:
+      contents = reencode_movw_imm (contents, addend);
+      break;
+
+    default:
+      /* Repack simple data */
+      if (howto->dst_mask & (howto->dst_mask + 1))
+	return bfd_reloc_notsupported;
+
+      contents = ((contents & ~howto->dst_mask) | (addend & howto->dst_mask));
+      break;
+    }
+
+  switch (size)
+    {
+    case 2:
+      bfd_put_16 (abfd, contents, address);
+      break;
+    case 4:
+      if (howto->dst_mask != 0xffffffff)
+	/* must be 32-bit instruction, always little-endian */
+	bfd_putl32 (contents, address);
+      else
+	/* must be 32-bit data (endianness dependent) */
+	bfd_put_32 (abfd, contents, address);
+      break;
+    case 8:
+      bfd_put_64 (abfd, contents, address);
+      break;
+    default:
+      abort ();
+    }
+
+  return status;
+}
+
+bfd_vma
+_bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
+				     bfd_vma place, bfd_vma value,
+				     bfd_vma addend, bfd_boolean weak_undef_p)
+{
+  switch (r_type)
+    {
+    case BFD_RELOC_AARCH64_TLSDESC_CALL:
+    case BFD_RELOC_AARCH64_NONE:
+      break;
+
+    case BFD_RELOC_AARCH64_ADR_LO21_PCREL:
+    case BFD_RELOC_AARCH64_BRANCH19:
+    case BFD_RELOC_AARCH64_LD_LO19_PCREL:
+    case BFD_RELOC_AARCH64_16_PCREL:
+    case BFD_RELOC_AARCH64_32_PCREL:
+    case BFD_RELOC_AARCH64_64_PCREL:
+    case BFD_RELOC_AARCH64_TSTBR14:
+      if (weak_undef_p)
+	value = place;
+      value = value + addend - place;
+      break;
+
+    case BFD_RELOC_AARCH64_CALL26:
+    case BFD_RELOC_AARCH64_JUMP26:
+      value = value + addend - place;
+      break;
+
+    case BFD_RELOC_AARCH64_16:
+    case BFD_RELOC_AARCH64_32:
+    case BFD_RELOC_AARCH64_MOVW_G0_S:
+    case BFD_RELOC_AARCH64_MOVW_G1_S:
+    case BFD_RELOC_AARCH64_MOVW_G2_S:
+    case BFD_RELOC_AARCH64_MOVW_G0:
+    case BFD_RELOC_AARCH64_MOVW_G0_NC:
+    case BFD_RELOC_AARCH64_MOVW_G1:
+    case BFD_RELOC_AARCH64_MOVW_G1_NC:
+    case BFD_RELOC_AARCH64_MOVW_G2:
+    case BFD_RELOC_AARCH64_MOVW_G2_NC:
+    case BFD_RELOC_AARCH64_MOVW_G3:
+      value = value + addend;
+      break;
+
+    case BFD_RELOC_AARCH64_ADR_HI21_PCREL:
+    case BFD_RELOC_AARCH64_ADR_HI21_NC_PCREL:
+      if (weak_undef_p)
+	value = PG (place);
+      value = PG (value + addend) - PG (place);
+      break;
+
+    case BFD_RELOC_AARCH64_GOT_LD_PREL19:
+      value = value + addend - place;
+      break;
+
+    case BFD_RELOC_AARCH64_ADR_GOT_PAGE:
+    case BFD_RELOC_AARCH64_TLSDESC_ADR_PAGE21:
+    case BFD_RELOC_AARCH64_TLSGD_ADR_PAGE21:
+    case BFD_RELOC_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
+      value = PG (value + addend) - PG (place);
+      break;
+
+    case BFD_RELOC_AARCH64_ADD_LO12:
+    case BFD_RELOC_AARCH64_LD64_GOT_LO12_NC:
+    case BFD_RELOC_AARCH64_LD32_GOT_LO12_NC:
+    case BFD_RELOC_AARCH64_LDST8_LO12:
+    case BFD_RELOC_AARCH64_LDST16_LO12:
+    case BFD_RELOC_AARCH64_LDST32_LO12:
+    case BFD_RELOC_AARCH64_LDST64_LO12:
+    case BFD_RELOC_AARCH64_LDST128_LO12:
+    case BFD_RELOC_AARCH64_TLSDESC_ADD_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSDESC_ADD:
+    case BFD_RELOC_AARCH64_TLSDESC_LD64_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSDESC_LD32_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSDESC_LDR:
+    case BFD_RELOC_AARCH64_TLSGD_ADD_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSIE_LD32_GOTTPREL_LO12_NC:
+    case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12:
+    case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
+      value = PG_OFFSET (value + addend);
+      break;
+
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1:
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
+      value = (value + addend) & (bfd_vma) 0xffff0000;
+      break;
+    case BFD_RELOC_AARCH64_TLSLE_ADD_TPREL_HI12:
+      value = (value + addend) & (bfd_vma) 0xfff000;
+      break;
+
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0:
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
+      value = (value + addend) & (bfd_vma) 0xffff;
+      break;
+
+    case BFD_RELOC_AARCH64_TLSLE_MOVW_TPREL_G2:
+      value = (value + addend) & ~(bfd_vma) 0xffffffff;
+      value -= place & ~(bfd_vma) 0xffffffff;
+      break;
+
+    default:
+      break;
+    }
+
+  return value;
+}
+
+/* Hook called by the linker routine which adds symbols from an object
+   file.  */
+
+bfd_boolean
+_bfd_aarch64_elf_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
+				  Elf_Internal_Sym *sym,
+				  const char **namep ATTRIBUTE_UNUSED,
+				  flagword *flagsp ATTRIBUTE_UNUSED,
+				  asection **secp ATTRIBUTE_UNUSED,
+				  bfd_vma *valp ATTRIBUTE_UNUSED)
+{
+  if ((abfd->flags & DYNAMIC) == 0
+      && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
+	  || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
+    elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
+
+  return TRUE;
+}
+
+/* Support for core dump NOTE sections.  */
+
+bfd_boolean
+_bfd_aarch64_elf_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
+{
+  int offset;
+  size_t size;
+
+  switch (note->descsz)
+    {
+      default:
+	return FALSE;
+
+      case 392:		/* sizeof(struct elf_prstatus) on Linux/arm64.  */
+	/* pr_cursig */
+	elf_tdata (abfd)->core->signal
+	  = bfd_get_16 (abfd, note->descdata + 12);
+
+	/* pr_pid */
+	elf_tdata (abfd)->core->lwpid
+	  = bfd_get_32 (abfd, note->descdata + 32);
+
+	/* pr_reg */
+	offset = 112;
+	size = 272;
+
+	break;
+    }
+
+  /* Make a ".reg/999" section.  */
+  return _bfd_elfcore_make_pseudosection (abfd, ".reg",
+					  size, note->descpos + offset);
+}