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RISC-V: PR27584, surpress local and empty name symbols for nm.

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The local ".L0" symbol are usually generated to mark where the
auipc instruction is, and clang also uses ".LBB" to do the same
thing.  Besides, clang also uses the empty name symbols for label
differences.  Arm surpress their mapping symbols by regarding them
as special symbols, and MIPS surpress all local symbols.  Therefore,
RISC-V probably need to surpress the local and empty name symbols
for nm and related tools.  User can use "--special-syms" to show
these surpressed symbols.

bfd/
    PR27584
    * elfnn-riscv.c (riscv_elf_is_target_special_symbol): Added to
    omit local and empty symbols since they usually generated to
    mark the auipc instructions.
This commit is contained in:
Nelson Chu
2021-04-14 10:00:05 +08:00
parent f6a1f95749
commit ddfe525f28
2 changed files with 18 additions and 0 deletions
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7
bfd/ChangeLog
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@ -1,3 +1,10 @@
2021-04-15 Nelson Chu <nelson.chu@sifive.com>
PR27584
* elfnn-riscv.c (riscv_elf_is_target_special_symbol): Added to
omit local and empty symbols since they usually generated to
mark the auipc instructions.
2021-04-15 Lifang Xia<lifang_xia@c-sky.com>
* elf32-csky.c (csky_elf_howto_table)

11
bfd/elfnn-riscv.c
View File

@ -5094,6 +5094,16 @@ riscv_elf_obj_attrs_arg_type (int tag)
return (tag & 1) != 0 ? ATTR_TYPE_FLAG_STR_VAL : ATTR_TYPE_FLAG_INT_VAL;
}
/* PR27584, Omit local and empty symbols since they usually generated
for pcrel relocations. */
static bool
riscv_elf_is_target_special_symbol (bfd *abfd, asymbol *sym)
{
return (!strcmp (sym->name, "")
|| _bfd_elf_is_local_label_name (abfd, sym->name));
}
#define TARGET_LITTLE_SYM riscv_elfNN_vec
#define TARGET_LITTLE_NAME "elfNN-littleriscv"
#define TARGET_BIG_SYM riscv_elfNN_be_vec
@ -5106,6 +5116,7 @@ riscv_elf_obj_attrs_arg_type (int tag)
#define bfd_elfNN_bfd_reloc_type_lookup riscv_reloc_type_lookup
#define bfd_elfNN_bfd_merge_private_bfd_data \
_bfd_riscv_elf_merge_private_bfd_data
#define bfd_elfNN_bfd_is_target_special_symbol riscv_elf_is_target_special_symbol
#define elf_backend_copy_indirect_symbol riscv_elf_copy_indirect_symbol
#define elf_backend_create_dynamic_sections riscv_elf_create_dynamic_sections