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[111.98.113.1]) by smtp.gmail.com with ESMTPSA id k5-20020aa790c5000000b00686bef984e2sm1538494pfk.80.2023.08.31.10.14.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Aug 2023 10:14:02 -0700 (PDT) To: binutils@sourceware.org Subject: [PATCH v2 5/5] RISC-V: Initial ld.bfd support for TLSDESC. Date: Fri, 1 Sep 2023 02:13:35 +0900 Message-ID: <20230831171345.49052-6-ishitatsuyuki@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230831171345.49052-1-ishitatsuyuki@gmail.com> References: <20230817180852.121628-2-ishitatsuyuki@gmail.com> <20230831171345.49052-1-ishitatsuyuki@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-10.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: binutils@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Binutils mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Tatsuyuki Ishi via Binutils From: Tatsuyuki Ishi Reply-To: Tatsuyuki Ishi Cc: Tatsuyuki Ishi , rui314@gmail.com, ruiu@bluewhale.systems Errors-To: binutils-bounces+ouuuleilei=gmail.com@sourceware.org Sender: "Binutils" X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1774500943007427688 X-GMAIL-MSGID: 1775765824488642677 Only relocation handling for now; relaxation is not implemented yet. bfd/ * elfnn-riscv.c (riscv_elf_check_relocs): Record GOT reference and paired relocation for TLSDESC_HI20. (riscv_elf_adjust_dynamic_symbol): Allocate GOT and reloc slots for TLSDESC symbols. (riscv_elf_size_dynamic_sections): Likewise but for local symbols. (tlsdescoff): New helper to determine static addend for R_TLSDESC. (riscv_elf_relocate_section): Ignore TLSDESC_CALL reloc for now (it is relaxation only). Handle TLSDESC_{LOAD,ADD}_LO12 as paired pcrel relocs. For TLS GOT slot generation, generalize the logic to handle any combination of (GD, IE, TLSDESC). Add TLSDESC Rela generation. * ld/testsuite/ld-riscv-elf/tls*: Add TLSDESC instruction sequences next to the existing GD and IE sequences. Update expectations. --- v2: Fix one formatting issue, and an erroneous comment referring to the four-slot TLSDESC layout instead of the two-slot one. bfd/elfnn-riscv.c | 91 +++++++++++++++++++++++++++--- ld/testsuite/ld-riscv-elf/tls.d | 4 +- ld/testsuite/ld-riscv-elf/tls.s | 14 +++++ ld/testsuite/ld-riscv-elf/tlsbin.d | 5 ++ 4 files changed, 104 insertions(+), 10 deletions(-) diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c index 38883134828..35011a25341 100644 --- a/bfd/elfnn-riscv.c +++ b/bfd/elfnn-riscv.c @@ -166,6 +166,7 @@ struct riscv_elf_link_hash_entry #define GOT_TLS_GD 2 #define GOT_TLS_IE 4 #define GOT_TLS_LE 8 +#define GOT_TLSDESC 16 char tls_type; }; @@ -303,6 +304,7 @@ riscv_is_insn_reloc (const reloc_howto_type *howto) #define GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES #define TLS_GD_GOT_ENTRY_SIZE (RISCV_ELF_WORD_BYTES * 2) #define TLS_IE_GOT_ENTRY_SIZE RISCV_ELF_WORD_BYTES +#define TLSDESC_GOT_ENTRY_SIZE (RISCV_ELF_WORD_BYTES * 2) /* Reserve two entries of GOTPLT for ld.so, one is used for PLT resolver, the other is used for link map. Other targets also reserve one more entry used for runtime profile? */ @@ -858,6 +860,12 @@ riscv_elf_check_relocs (bfd *abfd, struct bfd_link_info *info, return false; break; + case R_RISCV_TLSDESC_HI20: + if (!riscv_elf_record_got_reference (abfd, info, h, r_symndx) + || !riscv_elf_record_tls_type (abfd, h, r_symndx, GOT_TLSDESC)) + return false; + break; + case R_RISCV_CALL: case R_RISCV_CALL_PLT: /* These symbol requires a procedure linkage table entry. @@ -1316,7 +1324,7 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) s = htab->elf.sgot; h->got.offset = s->size; dyn = htab->elf.dynamic_sections_created; - if (tls_type & (GOT_TLS_GD | GOT_TLS_IE)) + if (tls_type & (GOT_TLS_GD | GOT_TLS_IE | GOT_TLSDESC)) { int indx = 0; bool need_reloc = false; @@ -1337,6 +1345,14 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf) if (need_reloc) htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); } + + /* TLSDESC needs one dynamic reloc and two GOT slots. */ + if (tls_type & GOT_TLSDESC) + { + s->size += TLSDESC_GOT_ENTRY_SIZE; + /* TLSDESC always use dynamic relocs. */ + htab->elf.srelgot->size += sizeof (ElfNN_External_Rela); + } } else { @@ -1564,7 +1580,7 @@ riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) if (*local_got > 0) { *local_got = s->size; - if (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE)) + if (*local_tls_type & (GOT_TLS_GD | GOT_TLS_IE | GOT_TLSDESC)) { if (*local_tls_type & GOT_TLS_GD) { @@ -1578,6 +1594,11 @@ riscv_elf_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info) if (bfd_link_dll (info)) srel->size += sizeof (ElfNN_External_Rela); } + if (*local_tls_type & GOT_TLSDESC) + { + s->size += TLSDESC_GOT_ENTRY_SIZE; + srel->size += sizeof (ElfNN_External_Rela); + } } else { @@ -1728,6 +1749,17 @@ tpoff (struct bfd_link_info *info, bfd_vma address) return address - elf_hash_table (info)->tls_sec->vma - TP_OFFSET; } +/* Return the relocation value for a static TLSDESC relocation. */ + +static bfd_vma +tlsdescoff (struct bfd_link_info *info, bfd_vma address) +{ + /* If tls_sec is NULL, we should have signalled an error already. */ + if (elf_hash_table (info)->tls_sec == NULL) + return 0; + return address - elf_hash_table (info)->tls_sec->vma; +} + /* Return the global pointer's value, or 0 if it is not in use. */ static bfd_vma @@ -1764,6 +1796,7 @@ perform_relocation (const reloc_howto_type *howto, case R_RISCV_GOT_HI20: case R_RISCV_TLS_GOT_HI20: case R_RISCV_TLS_GD_HI20: + case R_RISCV_TLSDESC_HI20: if (ARCH_SIZE > 32 && !VALID_UTYPE_IMM (RISCV_CONST_HIGH_PART (value))) return bfd_reloc_overflow; value = ENCODE_UTYPE_IMM (RISCV_CONST_HIGH_PART (value)); @@ -1774,6 +1807,8 @@ perform_relocation (const reloc_howto_type *howto, case R_RISCV_TPREL_LO12_I: case R_RISCV_TPREL_I: case R_RISCV_PCREL_LO12_I: + case R_RISCV_TLSDESC_LOAD_LO12: + case R_RISCV_TLSDESC_ADD_LO12: value = ENCODE_ITYPE_IMM (value); break; @@ -2195,8 +2230,8 @@ riscv_elf_relocate_section (bfd *output_bfd, bfd_vma relocation; bfd_reloc_status_type r = bfd_reloc_ok; const char *name = NULL; - bfd_vma off, ie_off; - bool unresolved_reloc, is_ie = false; + bfd_vma off, ie_off, desc_off; + bool unresolved_reloc, is_ie = false, is_desc = false; bfd_vma pc = sec_addr (input_section) + rel->r_offset; int r_type = ELFNN_R_TYPE (rel->r_info), tls_type; reloc_howto_type *howto = riscv_elf_rtype_to_howto (input_bfd, r_type); @@ -2499,6 +2534,7 @@ riscv_elf_relocate_section (bfd *output_bfd, case R_RISCV_NONE: case R_RISCV_RELAX: case R_RISCV_TPREL_ADD: + case R_RISCV_TLSDESC_CALL: case R_RISCV_COPY: case R_RISCV_JUMP_SLOT: case R_RISCV_RELATIVE: @@ -2820,6 +2856,15 @@ riscv_elf_relocate_section (bfd *output_bfd, relocation = dtpoff (info, relocation); break; + case R_RISCV_TLSDESC_LOAD_LO12: + case R_RISCV_TLSDESC_ADD_LO12: + if (riscv_record_pcrel_lo_reloc (&pcrel_relocs, relocation, rel, + input_section, info, howto, + contents)) + continue; + r = bfd_reloc_overflow; + break; + case R_RISCV_32: /* Non ABS symbol should be blocked in check_relocs. */ if (ARCH_SIZE > 32) @@ -2885,11 +2930,16 @@ riscv_elf_relocate_section (bfd *output_bfd, } break; + case R_RISCV_TLSDESC_HI20: + is_desc = true; + goto tls; + case R_RISCV_TLS_GOT_HI20: is_ie = true; - /* Fall through. */ + goto tls; case R_RISCV_TLS_GD_HI20: + tls: if (h != NULL) { off = h->got.offset; @@ -2902,12 +2952,16 @@ riscv_elf_relocate_section (bfd *output_bfd, } tls_type = _bfd_riscv_elf_tls_type (input_bfd, h, r_symndx); - BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD)); + BFD_ASSERT (tls_type & (GOT_TLS_IE | GOT_TLS_GD | GOT_TLSDESC)); /* If this symbol is referenced by both GD and IE TLS, the IE reference's GOT slot follows the GD reference's slots. */ ie_off = 0; if ((tls_type & GOT_TLS_GD) && (tls_type & GOT_TLS_IE)) - ie_off = TLS_GD_GOT_ENTRY_SIZE; + ie_off += TLS_GD_GOT_ENTRY_SIZE; + + desc_off = ie_off; + if (tls_type & GOT_TLS_IE) + desc_off += TLS_IE_GOT_ENTRY_SIZE; if ((off & 1) != 0) off &= ~1; @@ -2989,10 +3043,29 @@ riscv_elf_relocate_section (bfd *output_bfd, htab->elf.sgot->contents + off + ie_off); } } + + if (tls_type & GOT_TLSDESC) + { + /* TLSDESC is always handled by the dynamic linker and always need + * a relocation. */ + bfd_put_NN (output_bfd, 0, + htab->elf.sgot->contents + off + desc_off); + outrel.r_offset = sec_addr (htab->elf.sgot) + + off + desc_off; + outrel.r_addend = 0; + if (indx == 0) + outrel.r_addend = tlsdescoff (info, relocation); + outrel.r_info = ELFNN_R_INFO (indx, R_RISCV_TLSDESC); + riscv_elf_append_rela (output_bfd, htab->elf.srelgot, &outrel); + } } BFD_ASSERT (off < (bfd_vma) -2); - relocation = sec_addr (htab->elf.sgot) + off + (is_ie ? ie_off : 0); + relocation = sec_addr (htab->elf.sgot) + off; + if (is_ie) + relocation += ie_off; + else if (is_desc) + relocation += desc_off; if (!riscv_record_pcrel_hi_reloc (&pcrel_relocs, pc, relocation, r_type, false)) @@ -3212,7 +3285,7 @@ riscv_elf_finish_dynamic_symbol (bfd *output_bfd, } if (h->got.offset != (bfd_vma) -1 - && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE)) + && !(riscv_elf_hash_entry (h)->tls_type & (GOT_TLS_GD | GOT_TLS_IE | GOT_TLSDESC)) && !UNDEFWEAK_NO_DYNAMIC_RELOC (info, h)) { asection *sgot; diff --git a/ld/testsuite/ld-riscv-elf/tls.d b/ld/testsuite/ld-riscv-elf/tls.d index 0e2ab5683ad..5019383070c 100644 --- a/ld/testsuite/ld-riscv-elf/tls.d +++ b/ld/testsuite/ld-riscv-elf/tls.d @@ -2,13 +2,15 @@ #ld: --shared tmpdir/tlslib.so #readelf: -Wr -Relocation section '.rela.dyn' at offset 0x[0-9a-f]+ contains 5 entries: +Relocation section '.rela.dyn' at offset 0x[0-9a-f]+ contains 7 entries: +Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend [0-9a-f]+ +[0-9a-f]+ R_RISCV_TLS_DTPMOD64 +0 [0-9a-f]+ +[0-9a-f]+ R_RISCV_TLS_TPREL64 +4 +[0-9a-f]+ +[0-9a-f]+ R_RISCV_TLSDESC +4 [0-9a-f]+ +[0-9a-f]+ R_RISCV_TLS_DTPMOD64 +0+ sg1 \+ 0 [0-9a-f]+ +[0-9a-f]+ R_RISCV_TLS_DTPREL64 +0+ sg1 \+ 0 [0-9a-f]+ +[0-9a-f]+ R_RISCV_TLS_TPREL64 +0+ sg1 \+ 0 +[0-9a-f]+ +[0-9a-f]+ R_RISCV_TLSDESC +0+ sg1 \+ 0 Relocation section '.rela.plt' at offset 0x[0-9a-f]+ contains 1 entry: +Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend diff --git a/ld/testsuite/ld-riscv-elf/tls.s b/ld/testsuite/ld-riscv-elf/tls.s index 79e9bc20374..7cbf5ea6c72 100644 --- a/ld/testsuite/ld-riscv-elf/tls.s +++ b/ld/testsuite/ld-riscv-elf/tls.s @@ -17,6 +17,13 @@ _start: la.tls.ie a0,sg1 add a0,a0,tp + /* GD (TLSDESC), global var */ +.desc1: + auipc a0, %tlsdesc_hi(sg1) + lw t0, %tlsdesc_load_lo(.desc1)(a0) + addi a0, a0, %tlsdesc_add_lo(.desc1) + jalr t0, t0, %tlsdesc_call(.desc1) + /* GD, local var */ la.tls.gd a0,sl1 call __tls_get_addr @@ -25,4 +32,11 @@ _start: la.tls.ie a0,sl1 add a0,a0,tp + /* GD (TLSDESC), local var */ +.desc2: + auipc a0, %tlsdesc_hi(sl1) + lw t0, %tlsdesc_load_lo(.desc2)(a0) + addi a0, a0, %tlsdesc_add_lo(.desc2) + jalr t0, t0, %tlsdesc_call(.desc2) + ret diff --git a/ld/testsuite/ld-riscv-elf/tlsbin.d b/ld/testsuite/ld-riscv-elf/tlsbin.d index 12a4d0ea703..16545a90639 100644 --- a/ld/testsuite/ld-riscv-elf/tlsbin.d +++ b/ld/testsuite/ld-riscv-elf/tlsbin.d @@ -2,6 +2,11 @@ #ld: -no-pie tmpdir/tlslib.so #readelf: -Wr +Relocation section '.rela.dyn' at offset 0x[0-9a-f]+ contains 2 entries: + +Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend +[0-9a-f]+ +[0-9a-f]+ R_RISCV_TLSDESC +4 +[0-9a-f]+ +[0-9a-f]+ R_RISCV_TLSDESC +0 + Relocation section '.rela.plt' at offset 0x[0-9a-f]+ contains 1 entry: +Offset +Info +Type +Symbol's Value +Symbol's Name \+ Addend [0-9a-f]+ +[0-9a-f]+ R_RISCV_JUMP_SLOT +[0-9a-f]+ __tls_get_addr \+ 0 \ No newline at end of file