Preserve all mapping symbols in ARM and AArch64 object files.
bfd * elfnn-aarch64.c (is_aarch64_mapping_symbol): New function. Returns TRUE for AArch64 mapping symbols. (elfNN_aarch64_backend_symbol_processing): New function. Marks mapping symbols as precious in object files so that they will not be stripped. (elf_backend_symbol_processing): Define. * elf32-arm.c (is_arm_mapping_symbol): New function. Returns TRUE for ARM mapping symbols. (elf32_arm_backend_symbol_processing): Make use of the new function.
This commit is contained in:
Nick Clifton
parent
6844c0ccea
commit
d691934d08
3 changed files with 73 additions and 4 deletions
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@ -1,3 +1,16 @@
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2016-06-29 Nick Clifton <nickc@redhat.com>
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* elfnn-aarch64.c (is_aarch64_mapping_symbol): New function.
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Returns TRUE for AArch64 mapping symbols.
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(elfNN_aarch64_backend_symbol_processing): New function. Marks
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mapping symbols as precious in object files so that they will not
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be stripped.
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(elf_backend_symbol_processing): Define.
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* elf32-arm.c (is_arm_mapping_symbol): New function. Returns TRUE
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for ARM mapping symbols.
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(elf32_arm_backend_symbol_processing): Make use of the new function.
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2016-06-28 H.J. Lu <hongjiu.lu@intel.com>
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PR ld/20306
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@ -18266,6 +18266,28 @@ elf32_arm_copy_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
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return FALSE;
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}
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/* Returns TRUE if NAME is an ARM mapping symbol.
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Traditionally the symbols $a, $d and $t have been used.
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The ARM ELF standard also defines $x (for A64 code). It also allows a
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period initiated suffix to be added to the symbol: "$[adtx]\.[:sym_char]+".
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Other tools might also produce $b (Thumb BL), $f, $p, $m and $v, but we do
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not support them here. $t.x indicates the start of ThumbEE instructions. */
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static bfd_boolean
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is_arm_mapping_symbol (const char * name)
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{
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return name != NULL /* Paranoia. */
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&& name[0] == '$' /* Note: if objcopy --prefix-symbols has been used then
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the mapping symbols could have acquired a prefix.
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We do not support this here, since such symbols no
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longer conform to the ARM ELF ABI. */
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&& (name[1] == 'a' || name[1] == 'd' || name[1] == 't' || name[1] == 'x')
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&& (name[2] == 0 || name[2] == '.');
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/* FIXME: Strictly speaking the symbol is only a valid mapping symbol if
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any characters that follow the period are legal characters for the body
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of a symbol's name. For now we just assume that this is the case. */
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}
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/* Make sure that mapping symbols in object files are not removed via the
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"strip --strip-unneeded" tool. These symbols are needed in order to
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correctly generate interworking veneers, and for byte swapping code
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@ -18276,11 +18298,8 @@ static void
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elf32_arm_backend_symbol_processing (bfd *abfd, asymbol *sym)
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{
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if (((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
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&& sym->name != NULL
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&& sym->section != bfd_abs_section_ptr
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&& (strcmp (sym->name, "$a") == 0
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|| strcmp (sym->name, "$t") == 0
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|| strcmp (sym->name, "$d") == 0))
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&& is_arm_mapping_symbol (sym->name))
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sym->flags |= BSF_KEEP;
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}
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@ -9212,6 +9212,40 @@ elfNN_aarch64_plt_sym_val (bfd_vma i, const asection *plt,
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return plt->vma + PLT_ENTRY_SIZE + i * PLT_SMALL_ENTRY_SIZE;
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}
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/* Returns TRUE if NAME is an AArch64 mapping symbol.
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The ARM ELF standard defines $x (for A64 code) and $d (for data).
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It also allows a period initiated suffix to be added to the symbol, ie:
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"$[adtx]\.[:sym_char]+". */
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static bfd_boolean
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is_aarch64_mapping_symbol (const char * name)
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{
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return name != NULL /* Paranoia. */
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&& name[0] == '$' /* Note: if objcopy --prefix-symbols has been used then
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the mapping symbols could have acquired a prefix.
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We do not support this here, since such symbols no
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longer conform to the ARM ELF ABI. */
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&& (name[1] == 'd' || name[1] == 'x')
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&& (name[2] == 0 || name[2] == '.');
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/* FIXME: Strictly speaking the symbol is only a valid mapping symbol if
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any characters that follow the period are legal characters for the body
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of a symbol's name. For now we just assume that this is the case. */
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}
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/* Make sure that mapping symbols in object files are not removed via the
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"strip --strip-unneeded" tool. These symbols might needed in order to
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correctly generate linked files. Once an object file has been linked,
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it should be safe to remove them. */
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static void
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elfNN_aarch64_backend_symbol_processing (bfd *abfd, asymbol *sym)
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{
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if (((abfd->flags & (EXEC_P | DYNAMIC)) == 0)
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&& sym->section != bfd_abs_section_ptr
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&& is_aarch64_mapping_symbol (sym->name))
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sym->flags |= BSF_KEEP;
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}
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/* We use this so we can override certain functions
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(though currently we don't). */
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@ -9351,6 +9385,9 @@ const struct elf_size_info elfNN_aarch64_size_info =
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#define elf_backend_write_section \
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elfNN_aarch64_write_section
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#define elf_backend_symbol_processing \
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elfNN_aarch64_backend_symbol_processing
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#define elf_backend_can_refcount 1
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#define elf_backend_can_gc_sections 1
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#define elf_backend_plt_readonly 1
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