From 6158b25f77db11712b84e6a4609898f2615ac749 Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Wed, 10 Aug 2022 10:38:52 +0930 Subject: [PATCH] PR29462, internal error in relocate, at powerpc.cc:10796 Prior to the inline plt call support (commit 08be322439), the only local syms with plt entries were local ifunc symbols. There shouldn't be stubs for other local symbols so don't look for them. The patch also fixes minor bugs in get_reference_flags; Many relocs are valid only for ppc64 and a couple only for ppc32. PR 29462 * powerpc.cc (Target_powerpc::Relocate::relocate): Rename use_plt_offset to pltcal_to_direct, invert logic. For relocs not used with inline plt sequences against local symbols, only look for stubs when the symbol is an ifunc. (Target_powerpc::Scan::get_reference_flags): Correct reloc handling for relocs not valid for both 32-bit and 64-bit. --- gold/powerpc.cc | 129 ++++++++++++++++++++++++++++-------------------- 1 file changed, 75 insertions(+), 54 deletions(-) diff --git a/gold/powerpc.cc b/gold/powerpc.cc index 86e2b99be4e..22c0462326d 100644 --- a/gold/powerpc.cc +++ b/gold/powerpc.cc @@ -7675,22 +7675,18 @@ Target_powerpc::Scan::get_reference_flags( switch (r_type) { + case elfcpp::R_PPC64_TOC: + if (size != 64) + break; + // Fall through. case elfcpp::R_POWERPC_NONE: case elfcpp::R_POWERPC_GNU_VTINHERIT: case elfcpp::R_POWERPC_GNU_VTENTRY: - case elfcpp::R_PPC64_TOC: // No symbol reference. break; case elfcpp::R_PPC64_ADDR64: case elfcpp::R_PPC64_UADDR64: - case elfcpp::R_POWERPC_ADDR32: - case elfcpp::R_POWERPC_UADDR32: - case elfcpp::R_POWERPC_ADDR16: - case elfcpp::R_POWERPC_UADDR16: - case elfcpp::R_POWERPC_ADDR16_LO: - case elfcpp::R_POWERPC_ADDR16_HI: - case elfcpp::R_POWERPC_ADDR16_HA: case elfcpp::R_PPC64_ADDR16_HIGHER34: case elfcpp::R_PPC64_ADDR16_HIGHERA34: case elfcpp::R_PPC64_ADDR16_HIGHEST34: @@ -7700,6 +7696,16 @@ Target_powerpc::Scan::get_reference_flags( case elfcpp::R_PPC64_D34_HI30: case elfcpp::R_PPC64_D34_HA30: case elfcpp::R_PPC64_D28: + if (size != 64) + break; + // Fall through. + case elfcpp::R_POWERPC_ADDR32: + case elfcpp::R_POWERPC_UADDR32: + case elfcpp::R_POWERPC_ADDR16: + case elfcpp::R_POWERPC_UADDR16: + case elfcpp::R_POWERPC_ADDR16_LO: + case elfcpp::R_POWERPC_ADDR16_HI: + case elfcpp::R_POWERPC_ADDR16_HA: ref = Symbol::ABSOLUTE_REF; break; @@ -7710,13 +7716,14 @@ Target_powerpc::Scan::get_reference_flags( ref = Symbol::FUNCTION_CALL | Symbol::ABSOLUTE_REF; break; - case elfcpp::R_PPC64_REL64: - case elfcpp::R_POWERPC_REL32: case elfcpp::R_PPC_LOCAL24PC: - case elfcpp::R_POWERPC_REL16: - case elfcpp::R_POWERPC_REL16_LO: - case elfcpp::R_POWERPC_REL16_HI: - case elfcpp::R_POWERPC_REL16_HA: + if (size != 32) + break; + // Fall through. + ref = Symbol::RELATIVE_REF; + break; + + case elfcpp::R_PPC64_REL64: case elfcpp::R_PPC64_REL16_HIGH: case elfcpp::R_PPC64_REL16_HIGHA: case elfcpp::R_PPC64_REL16_HIGHER: @@ -7729,36 +7736,45 @@ Target_powerpc::Scan::get_reference_flags( case elfcpp::R_PPC64_REL16_HIGHEST34: case elfcpp::R_PPC64_REL16_HIGHESTA34: case elfcpp::R_PPC64_PCREL28: + if (size != 64) + break; + // Fall through. + case elfcpp::R_POWERPC_REL32: + case elfcpp::R_POWERPC_REL16: + case elfcpp::R_POWERPC_REL16_LO: + case elfcpp::R_POWERPC_REL16_HI: + case elfcpp::R_POWERPC_REL16_HA: ref = Symbol::RELATIVE_REF; break; + case elfcpp::R_PPC_PLTREL24: + if (size != 32) + break; + ref = Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; + break; + case elfcpp::R_PPC64_REL24_NOTOC: - if (size == 32) + case elfcpp::R_PPC64_REL24_P9NOTOC: + case elfcpp::R_PPC64_PLT16_LO_DS: + case elfcpp::R_PPC64_PLTSEQ_NOTOC: + case elfcpp::R_PPC64_PLTCALL_NOTOC: + case elfcpp::R_PPC64_PLT_PCREL34: + case elfcpp::R_PPC64_PLT_PCREL34_NOTOC: + if (size != 64) break; // Fall through. - case elfcpp::R_PPC64_REL24_P9NOTOC: case elfcpp::R_POWERPC_REL24: - case elfcpp::R_PPC_PLTREL24: case elfcpp::R_POWERPC_REL14: case elfcpp::R_POWERPC_REL14_BRTAKEN: case elfcpp::R_POWERPC_REL14_BRNTAKEN: case elfcpp::R_POWERPC_PLT16_LO: case elfcpp::R_POWERPC_PLT16_HI: case elfcpp::R_POWERPC_PLT16_HA: - case elfcpp::R_PPC64_PLT16_LO_DS: case elfcpp::R_POWERPC_PLTSEQ: - case elfcpp::R_PPC64_PLTSEQ_NOTOC: case elfcpp::R_POWERPC_PLTCALL: - case elfcpp::R_PPC64_PLTCALL_NOTOC: - case elfcpp::R_PPC64_PLT_PCREL34: - case elfcpp::R_PPC64_PLT_PCREL34_NOTOC: ref = Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; break; - case elfcpp::R_POWERPC_GOT16: - case elfcpp::R_POWERPC_GOT16_LO: - case elfcpp::R_POWERPC_GOT16_HI: - case elfcpp::R_POWERPC_GOT16_HA: case elfcpp::R_PPC64_GOT16_DS: case elfcpp::R_PPC64_GOT16_LO_DS: case elfcpp::R_PPC64_GOT_PCREL34: @@ -7768,11 +7784,16 @@ Target_powerpc::Scan::get_reference_flags( case elfcpp::R_PPC64_TOC16_HA: case elfcpp::R_PPC64_TOC16_DS: case elfcpp::R_PPC64_TOC16_LO_DS: + if (size != 64) + break; + // Fall through. + case elfcpp::R_POWERPC_GOT16: + case elfcpp::R_POWERPC_GOT16_LO: + case elfcpp::R_POWERPC_GOT16_HI: + case elfcpp::R_POWERPC_GOT16_HA: ref = Symbol::RELATIVE_REF; break; - case elfcpp::R_POWERPC_GOT_TPREL16: - case elfcpp::R_POWERPC_TLS: case elfcpp::R_PPC64_TLSGD: case elfcpp::R_PPC64_TLSLD: case elfcpp::R_PPC64_TPREL34: @@ -7781,6 +7802,11 @@ Target_powerpc::Scan::get_reference_flags( case elfcpp::R_PPC64_GOT_TLSLD_PCREL34: case elfcpp::R_PPC64_GOT_TPREL_PCREL34: case elfcpp::R_PPC64_GOT_DTPREL_PCREL34: + if (size != 64) + break; + // Fall through. + case elfcpp::R_POWERPC_GOT_TPREL16: + case elfcpp::R_POWERPC_TLS: ref = Symbol::TLS_REF; break; @@ -10671,10 +10697,8 @@ Target_powerpc::Relocate::relocate( bool has_stub_value = false; bool localentry0 = false; unsigned int r_sym = elfcpp::elf_r_sym(rela.get_r_info()); - bool use_plt_offset - = (gsym != NULL - ? gsym->use_plt_offset(Scan::get_reference_flags(r_type, target)) - : object->local_has_plt_offset(r_sym)); + bool pltcall_to_direct = false; + if (is_plt16_reloc(r_type) || r_type == elfcpp::R_PPC64_PLT_PCREL34 || r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC @@ -10688,21 +10712,18 @@ Target_powerpc::Relocate::relocate( // that the decision depends on the PLTCALL reloc, and we don't // know the address of that instruction when processing others // in the sequence. So the decision needs to be made in - // do_relax(). For now, don't optimise inline plt calls. - if (gsym) - use_plt_offset = gsym->has_plt_offset(); - } - if (use_plt_offset - && !is_got_reloc(r_type) - && !is_plt16_reloc(r_type) - && r_type != elfcpp::R_PPC64_PLT_PCREL34 - && r_type != elfcpp::R_PPC64_PLT_PCREL34_NOTOC - && r_type != elfcpp::R_POWERPC_PLTSEQ - && r_type != elfcpp::R_POWERPC_PLTCALL - && r_type != elfcpp::R_PPC64_PLTSEQ_NOTOC - && r_type != elfcpp::R_PPC64_PLTCALL_NOTOC - && (!psymval->is_ifunc_symbol() - || Scan::reloc_needs_plt_for_ifunc(target, object, r_type, false))) + // do_relax(). + pltcall_to_direct = !(gsym != NULL + ? gsym->has_plt_offset() + : object->local_has_plt_offset(r_sym)); + } + else if ((gsym != NULL + ? gsym->use_plt_offset(Scan::get_reference_flags(r_type, target)) + : psymval->is_ifunc_symbol() && object->local_has_plt_offset(r_sym)) + && !is_got_reloc(r_type) + && (!psymval->is_ifunc_symbol() + || Scan::reloc_needs_plt_for_ifunc(target, object, r_type, + false))) { if (size == 64 && gsym != NULL @@ -10796,9 +10817,9 @@ Target_powerpc::Relocate::relocate( gold_assert(has_stub_value || !(os->flags() & elfcpp::SHF_ALLOC)); } - if (use_plt_offset && (is_plt16_reloc(r_type) - || r_type == elfcpp::R_PPC64_PLT_PCREL34 - || r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC)) + if (!pltcall_to_direct && (is_plt16_reloc(r_type) + || r_type == elfcpp::R_PPC64_PLT_PCREL34 + || r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC)) { const Output_data_plt_powerpc* plt; if (gsym) @@ -10826,7 +10847,7 @@ Target_powerpc::Relocate::relocate( value -= target->toc_pointer(); } } - else if (!use_plt_offset + else if (pltcall_to_direct && (is_plt16_reloc(r_type) || r_type == elfcpp::R_POWERPC_PLTSEQ || r_type == elfcpp::R_PPC64_PLTSEQ_NOTOC)) @@ -10835,7 +10856,7 @@ Target_powerpc::Relocate::relocate( elfcpp::Swap<32, big_endian>::writeval(iview, nop); r_type = elfcpp::R_POWERPC_NONE; } - else if (!use_plt_offset + else if (pltcall_to_direct && (r_type == elfcpp::R_PPC64_PLT_PCREL34 || r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC)) { @@ -11316,8 +11337,8 @@ Target_powerpc::Relocate::relocate( } else if (!has_stub_value) { - if (!use_plt_offset && (r_type == elfcpp::R_POWERPC_PLTCALL - || r_type == elfcpp::R_PPC64_PLTCALL_NOTOC)) + if (pltcall_to_direct && (r_type == elfcpp::R_POWERPC_PLTCALL + || r_type == elfcpp::R_PPC64_PLTCALL_NOTOC)) { // PLTCALL without plt entry => convert to direct call Insn* iview = reinterpret_cast(view);