LoongArch: Add tls transition support.
Transitions between DESC->IE/LE and IE->LE are supported now. 1. For DESC -> LE: pcalau12i $a0,%desc_pc_hi20(var) => lu12i.w $a0,%le_hi20(var) addi.d $a0,$a0,%desc_pc_lo12(var) => ori $a0,$a0,%le_lo12(var) ld.d $a1,$a0,%desc_ld(var) => NOP jirl $ra,$a1,%desc_call(var) => NOP add.d $a0,$a0,$tp 2. For DESC -> IE: pcalau12i $a0,%desc_pc_hi20(var) => pcalau12i $a0,%ie_pc_hi20(var) addi.d $a0,$a0,%desc_pc_lo12(var) => ld.d $a0,$a0,%ie_pc_lo12(var) ld.d $a1,$a0,%desc_ld(var) => NOP jirl $ra,$a1,%desc_call(var) => NOP add.d $a0,$a0,$tp 3. For IE -> LE: pcalau12i $a0,%ie_pc_hi20(var) => lu12i.w $a0,%le_hi20(var) ld.d $a0,$a0,%ie_pc_lo12(var) => ori $a0,$a0,%le_lo12(var) add.d $a0,$a0,$tp 4. When a tls variable is accessed using both DESC and IE, DESC transitions to IE and uses the same GOT entry as IE.
This commit is contained in:
Lulu Cai
liuzhensong
parent
4f248d61eb
commit
3898e04b8e
2 changed files with 221 additions and 1 deletions
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@ -145,6 +145,16 @@ struct loongarch_elf_link_hash_table
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#define elf_backend_rela_normal 1
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#define elf_backend_default_execstack 0
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#define IS_LOONGARCH_TLS_DESC_RELOC(R_TYPE) \
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((R_TYPE) == R_LARCH_TLS_DESC_PC_HI20 \
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|| (R_TYPE) == R_LARCH_TLS_DESC_PC_LO12 \
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|| (R_TYPE) == R_LARCH_TLS_DESC_LD \
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|| (R_TYPE) == R_LARCH_TLS_DESC_CALL)
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#define IS_LOONGARCH_TLS_IE_RELOC(R_TYPE) \
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((R_TYPE) == R_LARCH_TLS_IE_PC_HI20 \
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|| (R_TYPE) == R_LARCH_TLS_IE_PC_LO12)
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/* Generate a PLT header. */
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static bool
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@ -593,6 +603,10 @@ loongarch_elf_record_tls_and_got_reference (bfd *abfd,
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char *new_tls_type = &_bfd_loongarch_elf_tls_type (abfd, h, symndx);
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*new_tls_type |= tls_type;
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/* If a symbol is accessed by both IE and DESC, relax DESC to IE. */
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if ((*new_tls_type & GOT_TLS_IE) && (*new_tls_type & GOT_TLS_GDESC))
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*new_tls_type &= ~ (GOT_TLS_GDESC);
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if ((*new_tls_type & GOT_NORMAL) && (*new_tls_type & ~GOT_NORMAL))
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{
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_bfd_error_handler (_("%pB: `%s' accessed both as normal and "
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@ -605,6 +619,104 @@ loongarch_elf_record_tls_and_got_reference (bfd *abfd,
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return true;
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}
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static unsigned int
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loongarch_reloc_got_type (unsigned int r_type)
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{
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switch (r_type)
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{
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case R_LARCH_TLS_DESC_PC_HI20:
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case R_LARCH_TLS_DESC_PC_LO12:
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case R_LARCH_TLS_DESC_LD:
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case R_LARCH_TLS_DESC_CALL:
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return GOT_TLS_GDESC;
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case R_LARCH_TLS_IE_PC_HI20:
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case R_LARCH_TLS_IE_PC_LO12:
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return GOT_TLS_IE;
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default:
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break;
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}
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return GOT_UNKNOWN;
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}
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/* Return true if tls type transition can be performed. */
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static bool
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loongarch_can_relax_tls (struct bfd_link_info *info, unsigned int r_type,
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struct elf_link_hash_entry *h, bfd *input_bfd,
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unsigned long r_symndx)
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{
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char symbol_tls_type;
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unsigned int reloc_got_type;
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if (! (IS_LOONGARCH_TLS_DESC_RELOC (r_type)
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|| IS_LOONGARCH_TLS_IE_RELOC (r_type)))
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return false;
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symbol_tls_type = _bfd_loongarch_elf_tls_type (input_bfd, h, r_symndx);
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reloc_got_type = loongarch_reloc_got_type (r_type);
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if (symbol_tls_type == GOT_TLS_IE && GOT_TLS_GD_ANY_P (reloc_got_type))
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return true;
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if (! bfd_link_executable (info))
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return false;
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if (h && h->root.type == bfd_link_hash_undefweak)
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return false;
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return true;
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}
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/* The type of relocation that can be transitioned. */
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static unsigned int
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loongarch_tls_transition_without_check (struct bfd_link_info *info,
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unsigned int r_type,
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struct elf_link_hash_entry *h)
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{
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bool local_exec = bfd_link_executable (info)
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&& SYMBOL_REFERENCES_LOCAL (info, h);
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switch (r_type)
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{
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case R_LARCH_TLS_DESC_PC_HI20:
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return (local_exec
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? R_LARCH_TLS_LE_HI20
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: R_LARCH_TLS_IE_PC_HI20);
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case R_LARCH_TLS_DESC_PC_LO12:
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return (local_exec
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? R_LARCH_TLS_LE_LO12
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: R_LARCH_TLS_IE_PC_LO12);
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case R_LARCH_TLS_DESC_LD:
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case R_LARCH_TLS_DESC_CALL:
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return R_LARCH_NONE;
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case R_LARCH_TLS_IE_PC_HI20:
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return local_exec ? R_LARCH_TLS_LE_HI20 : r_type;
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case R_LARCH_TLS_IE_PC_LO12:
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return local_exec ? R_LARCH_TLS_LE_LO12 : r_type;
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default:
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break;
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}
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return r_type;
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}
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static unsigned int
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loongarch_tls_transition (struct bfd_link_info *info, unsigned int r_type,
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struct elf_link_hash_entry *h, bfd *input_bfd,
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unsigned long r_symndx)
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{
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if (! loongarch_can_relax_tls (info, r_type, h, input_bfd,r_symndx))
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return r_type;
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return loongarch_tls_transition_without_check (info, r_type, h);
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}
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/* Look through the relocs for a section during the first phase, and
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allocate space in the global offset table or procedure linkage
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table. */
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@ -706,6 +818,7 @@ loongarch_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
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int need_dynreloc = 0;
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int only_need_pcrel = 0;
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r_type = loongarch_tls_transition (info, r_type, h, abfd, r_symndx);
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switch (r_type)
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{
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case R_LARCH_GOT_PC_HI20:
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@ -2403,6 +2516,96 @@ loongarch_reloc_is_fatal (struct bfd_link_info *info,
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relocation += 0x100000000; \
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})
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/* Transition instruction sequence to relax instruction sequence. */
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static bool
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loongarch_tls_relax (bfd *abfd, asection *sec, Elf_Internal_Rela *rel,
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int r_type, struct elf_link_hash_entry *h,
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struct bfd_link_info *info)
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{
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bool local_exec = bfd_link_executable (info)
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&& SYMBOL_REFERENCES_LOCAL (info, h);
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bfd_byte *contents = elf_section_data (sec)->this_hdr.contents;
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unsigned long insn;
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switch (r_type)
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{
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case R_LARCH_TLS_DESC_PC_HI20:
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if (local_exec)
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/* DESC -> LE relaxation:
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pcalalau12i $a0,%desc_pc_hi20(var) =>
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lu12i.w $a0,%le_hi20(var)
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*/
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bfd_put (32, abfd, LARCH_LU12I_W | LARCH_RD_A0,
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contents + rel->r_offset);
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/* DESC -> IE relaxation:
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pcalalau12i $a0,%desc_pc_hi20(var) =>
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pcalalau12i $a0,%ie_pc_hi20(var)
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*/
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return true;
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case R_LARCH_TLS_DESC_PC_LO12:
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if (local_exec)
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{
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/* DESC -> LE relaxation:
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addi.d $a0,$a0,%desc_pc_lo12(var) =>
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ori $a0,$a0,le_lo12(var)
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*/
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insn = LARCH_ORI | LARCH_RD_RJ_A0;
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bfd_put (32, abfd, LARCH_ORI | LARCH_RD_RJ_A0,
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contents + rel->r_offset);
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}
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else
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{
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/* DESC -> IE relaxation:
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addi.d $a0,$a0,%desc_pc_lo12(var) =>
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ld.d $a0,$a0,%%ie_pc_lo12
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*/
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bfd_put (32, abfd, LARCH_LD_D | LARCH_RD_RJ_A0,
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contents + rel->r_offset);
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}
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return true;
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case R_LARCH_TLS_DESC_LD:
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case R_LARCH_TLS_DESC_CALL:
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/* DESC -> LE/IE relaxation:
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ld.d $ra,$a0,%desc_ld(var) => NOP
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jirl $ra,$ra,%desc_call(var) => NOP
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*/
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bfd_put (32, abfd, LARCH_NOP, contents + rel->r_offset);
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return true;
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case R_LARCH_TLS_IE_PC_HI20:
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if (local_exec)
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{
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/* IE -> LE relaxation:
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pcalalau12i $rd,%ie_pc_hi20(var) =>
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lu12i.w $rd,%le_hi20(var)
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*/
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insn = bfd_getl32 (contents + rel->r_offset);
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bfd_put (32, abfd, LARCH_LU12I_W | (insn & 0x1f),
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contents + rel->r_offset);
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}
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return true;
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case R_LARCH_TLS_IE_PC_LO12:
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if (local_exec)
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{
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/* IE -> LE relaxation:
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ld.d $rd,$rj,%%ie_pc_lo12 =>
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ori $rd,$rj,le_lo12(var)
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*/
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insn = bfd_getl32 (contents + rel->r_offset);
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bfd_put (32, abfd, LARCH_ORI | (insn & 0x3ff),
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contents + rel->r_offset);
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}
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return true;
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}
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return false;
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}
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static int
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loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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bfd *input_bfd, asection *input_section,
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@ -2426,7 +2629,7 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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relend = relocs + input_section->reloc_count;
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for (rel = relocs; rel < relend; rel++)
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{
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int r_type = ELFNN_R_TYPE (rel->r_info);
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unsigned int r_type = ELFNN_R_TYPE (rel->r_info);
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unsigned long r_symndx = ELFNN_R_SYM (rel->r_info);
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bfd_vma pc = sec_addr (input_section) + rel->r_offset;
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reloc_howto_type *howto = NULL;
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@ -2436,6 +2639,7 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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const char *name;
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bfd_reloc_status_type r = bfd_reloc_ok;
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bool is_ie, is_desc, is_undefweak, unresolved_reloc, defined_local;
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unsigned int relaxed_r_type;
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bool resolved_local, resolved_dynly, resolved_to_const;
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char tls_type;
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bfd_vma relocation, off, ie_off, desc_off;
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@ -2567,6 +2771,16 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
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BFD_ASSERT (!resolved_local || defined_local);
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relaxed_r_type = loongarch_tls_transition (info, r_type, h, input_bfd, r_symndx);
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if (relaxed_r_type != r_type)
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{
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howto = loongarch_elf_rtype_to_howto (input_bfd, relaxed_r_type);
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BFD_ASSERT (howto != NULL);
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if (loongarch_tls_relax (input_bfd, input_section, rel, r_type, h, info))
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r_type = relaxed_r_type;
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}
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is_desc = false;
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is_ie = false;
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switch (r_type)
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@ -42,6 +42,12 @@ extern "C"
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((value) < (-(1 << ((bits) - 1) << align)) \
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|| (value) > ((((1 << ((bits) - 1)) - 1) << align)))
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#define LARCH_LU12I_W 0x14000000
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#define LARCH_ORI 0x03800000
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#define LARCH_LD_D 0x28c00000
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#define LARCH_RD_A0 0x04
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#define LARCH_RD_RJ_A0 0x084
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typedef uint32_t insn_t;
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struct loongarch_opcode
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