PR29462, internal error in relocate, at powerpc.cc:10796

Alan Modra amodra@gmail.com
Wed Aug 10 06:01:08 GMT 2022


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.

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<size, big_endian>::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<size, big_endian>::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<size, big_endian>::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<size, big_endian>::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<size, big_endian>::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<size, big_endian>::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<size, big_endian>::Relocate::relocate(
   bool has_stub_value = false;
   bool localentry0 = false;
   unsigned int r_sym = elfcpp::elf_r_sym<size>(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<size>(r_type)
       || r_type == elfcpp::R_PPC64_PLT_PCREL34
       || r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC
@@ -10688,21 +10712,18 @@ Target_powerpc<size, big_endian>::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<size>(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<size, big_endian>::Relocate::relocate(
       gold_assert(has_stub_value || !(os->flags() & elfcpp::SHF_ALLOC));
     }
 
-  if (use_plt_offset && (is_plt16_reloc<size>(r_type)
-			 || r_type == elfcpp::R_PPC64_PLT_PCREL34
-			 || r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC))
+  if (!pltcall_to_direct && (is_plt16_reloc<size>(r_type)
+			     || r_type == elfcpp::R_PPC64_PLT_PCREL34
+			     || r_type == elfcpp::R_PPC64_PLT_PCREL34_NOTOC))
     {
       const Output_data_plt_powerpc<size, big_endian>* plt;
       if (gsym)
@@ -10826,7 +10847,7 @@ Target_powerpc<size, big_endian>::Relocate::relocate(
 	    value -= target->toc_pointer();
 	}
     }
-  else if (!use_plt_offset
+  else if (pltcall_to_direct
 	   && (is_plt16_reloc<size>(r_type)
 	       || r_type == elfcpp::R_POWERPC_PLTSEQ
 	       || r_type == elfcpp::R_PPC64_PLTSEQ_NOTOC))
@@ -10835,7 +10856,7 @@ Target_powerpc<size, big_endian>::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<size, big_endian>::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<Insn*>(view);

-- 
Alan Modra
Australia Development Lab, IBM


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