gdb: add target_ops::supports_displaced_step

[deliverable/binutils-gdb.git] / bfd / elfxx-aarch64.c

diff --git a/bfd/elfxx-aarch64.c b/bfd/elfxx-aarch64.c
index 040814097f98071db09564392ed972e2e9f29692..1495ade7550d9ebd746378ef18035aeae8064716 100644 (file)
--- a/bfd/elfxx-aarch64.c
+++ b/bfd/elfxx-aarch64.c
@@ -1,5 +1,5 @@
 /* AArch64-specific support for ELF.
-   Copyright (C) 2009-2019 Free Software Foundation, Inc.
+   Copyright (C) 2009-2020 Free Software Foundation, Inc.
    Contributed by ARM Ltd.
 
    This file is part of BFD, the Binary File Descriptor library.
@@ -395,10 +395,12 @@ _bfd_aarch64_elf_put_addend (bfd *abfd,
 }
 
 bfd_vma
-_bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
+_bfd_aarch64_elf_resolve_relocation (bfd *input_bfd,
+                                    bfd_reloc_code_real_type r_type,
                                     bfd_vma place, bfd_vma value,
                                     bfd_vma addend, bfd_boolean weak_undef_p)
 {
+  bfd_boolean tls_reloc = TRUE;
   switch (r_type)
     {
     case BFD_RELOC_AARCH64_NONE:
@@ -446,6 +448,8 @@ _bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
     case BFD_RELOC_AARCH64_MOVW_G2_NC:
     case BFD_RELOC_AARCH64_MOVW_G2_S:
     case BFD_RELOC_AARCH64_MOVW_G3:
+      tls_reloc = FALSE;
+      /* fall-through.  */
     case BFD_RELOC_AARCH64_TLSDESC_OFF_G0_NC:
     case BFD_RELOC_AARCH64_TLSDESC_OFF_G1:
     case BFD_RELOC_AARCH64_TLSGD_MOVW_G0_NC:
@@ -466,6 +470,15 @@ _bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
     case BFD_RELOC_AARCH64_TLSLE_LDST32_TPREL_LO12:
     case BFD_RELOC_AARCH64_TLSLE_LDST64_TPREL_LO12:
     case BFD_RELOC_AARCH64_TLSLE_LDST8_TPREL_LO12:
+      /* Weak Symbols and TLS relocations are implementation defined.  For this
+        case we choose to emit 0.  */
+      if (weak_undef_p && tls_reloc)
+       {
+         _bfd_error_handler (_("%pB: warning: Weak TLS is implementation "
+                               "defined and may not work as expected"),
+                               input_bfd);
+         value = place;
+       }
       value = value + addend;
       break;
 
@@ -695,6 +708,7 @@ _bfd_aarch64_elf_link_setup_gnu_properties (struct bfd_link_info *info,
   bfd *pbfd;
   bfd *ebfd = NULL;
   elf_property *prop;
+  unsigned align;
 
   uint32_t gnu_prop = *gprop;
 
@@ -719,6 +733,11 @@ _bfd_aarch64_elf_link_setup_gnu_properties (struct bfd_link_info *info,
       prop = _bfd_elf_get_property (ebfd,
                                    GNU_PROPERTY_AARCH64_FEATURE_1_AND,
                                    4);
+      if (gnu_prop & GNU_PROPERTY_AARCH64_FEATURE_1_BTI
+         && !(prop->u.number & GNU_PROPERTY_AARCH64_FEATURE_1_BTI))
+           _bfd_error_handler (_("%pB: warning: BTI turned on by -z force-bti "
+                                 "when all inputs do not have BTI in NOTE "
+                                 "section."), ebfd);
       prop->u.number |= gnu_prop;
       prop->pr_kind = property_number;
 
@@ -738,6 +757,11 @@ _bfd_aarch64_elf_link_setup_gnu_properties (struct bfd_link_info *info,
            info->callbacks->einfo (
              _("%F%P: failed to create GNU property section\n"));
 
+          align = (bfd_get_mach (ebfd) & bfd_mach_aarch64_ilp32) ? 2 : 3;
+         if (!bfd_set_section_alignment (sec, align))
+           info->callbacks->einfo (_("%F%pA: failed to align section\n"),
+                                   sec);
+
          elf_section_type (sec) = SHT_NOTE;
        }
     }