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64331 changed files with 5339189 additions and 0 deletions
175
devel/llvm/patches/patch-tools_lld_ELF_Driver_cpp
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175
devel/llvm/patches/patch-tools_lld_ELF_Driver_cpp
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@ -0,0 +1,175 @@
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- enable retpoline by default
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- enable PIE by default.
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- arm64 and riscv64 can now do --execute-only by default
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- enable --exec-only as default on AMD64
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- Make --execute-only the default on powerpc64.
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- Permit the --exec-only option on i386 also.
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- make --execute-only the default on powerpc
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- default sparc64 ld.lld to --execute-only
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- switch mips64 ld.lld to execute-only
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- Implement support for PT_OPENBSD_NOBTCFI in lld(1). This can be set using
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the -z nobtcfi option.
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Index: tools/lld/ELF/Driver.cpp
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--- tools/lld/ELF/Driver.cpp.orig
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+++ tools/lld/ELF/Driver.cpp
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@@ -358,8 +358,19 @@ static void checkOptions() {
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}
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if (config->executeOnly) {
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- if (config->emachine != EM_AARCH64)
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- error("-execute-only is only supported on AArch64 targets");
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+ switch (config->emachine) {
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+ case EM_386:
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+ case EM_AARCH64:
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+ case EM_MIPS:
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+ case EM_PPC:
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+ case EM_PPC64:
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+ case EM_RISCV:
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+ case EM_SPARCV9:
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+ case EM_X86_64:
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+ break;
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+ default:
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+ error("-execute-only is not supported on this target");
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+ }
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if (config->singleRoRx && !script->hasSectionsCommand)
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error("-execute-only and -no-rosegment cannot be used together");
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@@ -451,10 +462,12 @@ static bool isKnownZFlag(StringRef s) {
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s == "initfirst" || s == "interpose" ||
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s == "keep-text-section-prefix" || s == "lazy" || s == "muldefs" ||
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s == "separate-code" || s == "separate-loadable-segments" ||
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- s == "start-stop-gc" || s == "nocombreloc" || s == "nocopyreloc" ||
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+ s == "start-stop-gc" || s == "nobtcfi" ||
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+ s == "nocombreloc" || s == "nocopyreloc" ||
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s == "nodefaultlib" || s == "nodelete" || s == "nodlopen" ||
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s == "noexecstack" || s == "nognustack" ||
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s == "nokeep-text-section-prefix" || s == "norelro" ||
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+ s == "noretpolineplt" ||
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s == "noseparate-code" || s == "nostart-stop-gc" || s == "notext" ||
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s == "now" || s == "origin" || s == "pac-plt" || s == "rel" ||
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s == "rela" || s == "relro" || s == "retpolineplt" ||
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@@ -1045,8 +1058,6 @@ static void readConfigs(opt::InputArgList &args) {
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errorHandler().errorHandlingScript =
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args.getLastArgValue(OPT_error_handling_script);
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- config->executeOnly =
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- args.hasFlag(OPT_execute_only, OPT_no_execute_only, false);
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config->exportDynamic =
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args.hasFlag(OPT_export_dynamic, OPT_no_export_dynamic, false);
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config->filterList = args::getStrings(args, OPT_filter);
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@@ -1064,7 +1075,8 @@ static void readConfigs(opt::InputArgList &args) {
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config->ignoreDataAddressEquality =
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args.hasArg(OPT_ignore_data_address_equality);
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config->ignoreFunctionAddressEquality =
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- args.hasArg(OPT_ignore_function_address_equality);
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+ args.hasFlag(OPT_ignore_function_address_equality,
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+ OPT_no_ignore_function_address_equality, true);
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config->init = args.getLastArgValue(OPT_init, "_init");
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config->ltoAAPipeline = args.getLastArgValue(OPT_lto_aa_pipeline);
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config->ltoCSProfileGenerate = args.hasArg(OPT_lto_cs_profile_generate);
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@@ -1118,7 +1130,12 @@ static void readConfigs(opt::InputArgList &args) {
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config->optimize = args::getInteger(args, OPT_O, 1);
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config->orphanHandling = getOrphanHandling(args);
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config->outputFile = args.getLastArgValue(OPT_o);
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+#ifdef __OpenBSD__
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+ config->pie = args.hasFlag(OPT_pie, OPT_no_pie,
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+ !args.hasArg(OPT_shared) && !args.hasArg(OPT_relocatable));
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+#else
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config->pie = args.hasFlag(OPT_pie, OPT_no_pie, false);
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+#endif
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config->printIcfSections =
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args.hasFlag(OPT_print_icf_sections, OPT_no_print_icf_sections, false);
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config->printGcSections =
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@@ -1181,6 +1198,7 @@ static void readConfigs(opt::InputArgList &args) {
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config->zInterpose = hasZOption(args, "interpose");
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config->zKeepTextSectionPrefix = getZFlag(
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args, "keep-text-section-prefix", "nokeep-text-section-prefix", false);
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+ config->zNoBtCfi = hasZOption(args, "nobtcfi");
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config->zNodefaultlib = hasZOption(args, "nodefaultlib");
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config->zNodelete = hasZOption(args, "nodelete");
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config->zNodlopen = hasZOption(args, "nodlopen");
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@@ -1188,7 +1206,11 @@ static void readConfigs(opt::InputArgList &args) {
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config->zOrigin = hasZOption(args, "origin");
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config->zPacPlt = hasZOption(args, "pac-plt");
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config->zRelro = getZFlag(args, "relro", "norelro", true);
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- config->zRetpolineplt = hasZOption(args, "retpolineplt");
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+#ifndef __OpenBSD__
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+ config->zRetpolineplt = getZFlag(args, "retpolineplt", "noretpolineplt", false);
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+#else
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+ config->zRetpolineplt = getZFlag(args, "retpolineplt", "noretpolineplt", true);
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+#endif
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config->zRodynamic = hasZOption(args, "rodynamic");
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config->zSeparate = getZSeparate(args);
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config->zShstk = hasZOption(args, "shstk");
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@@ -1459,6 +1481,23 @@ static void setConfigs(opt::InputArgList &args) {
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args.hasFlag(OPT_toc_optimize, OPT_no_toc_optimize, m == EM_PPC64);
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config->pcRelOptimize =
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args.hasFlag(OPT_pcrel_optimize, OPT_no_pcrel_optimize, m == EM_PPC64);
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+
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+ config->executeOnly = false;
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+#ifdef __OpenBSD__
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+ switch (m) {
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+ case EM_AARCH64:
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+ case EM_MIPS:
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+ case EM_PPC:
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+ case EM_PPC64:
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+ case EM_RISCV:
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+ case EM_SPARCV9:
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+ case EM_X86_64:
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+ config->executeOnly = true;
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+ break;
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+ }
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+#endif
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+ config->executeOnly =
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+ args.hasFlag(OPT_execute_only, OPT_no_execute_only, config->executeOnly);
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}
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// Returns a value of "-format" option.
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@@ -1596,7 +1635,7 @@ void LinkerDriver::inferMachineType() {
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}
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// Parse -z max-page-size=<value>. The default value is defined by
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-// each target.
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+// each target. Is set to 1 if given nmagic or omagic.
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static uint64_t getMaxPageSize(opt::InputArgList &args) {
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uint64_t val = args::getZOptionValue(args, OPT_z, "max-page-size",
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target->defaultMaxPageSize);
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@@ -1611,7 +1650,7 @@ static uint64_t getMaxPageSize(opt::InputArgList &args
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}
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// Parse -z common-page-size=<value>. The default value is defined by
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-// each target.
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+// each target. Is set to 1 if given nmagic or omagic.
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static uint64_t getCommonPageSize(opt::InputArgList &args) {
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uint64_t val = args::getZOptionValue(args, OPT_z, "common-page-size",
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target->defaultCommonPageSize);
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@@ -1628,6 +1667,16 @@ static uint64_t getCommonPageSize(opt::InputArgList &a
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return val;
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}
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+// Parse -z max-page-size=<value>. The default value is defined by
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+// each target.
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+static uint64_t getRealMaxPageSize(opt::InputArgList &args) {
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+ uint64_t val = args::getZOptionValue(args, OPT_z, "max-page-size",
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+ target->defaultMaxPageSize);
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+ if (!isPowerOf2_64(val))
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+ error("max-page-size: value isn't a power of 2");
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+ return val;
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+}
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+
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// Parses -image-base option.
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static Optional<uint64_t> getImageBase(opt::InputArgList &args) {
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// Because we are using "Config->maxPageSize" here, this function has to be
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@@ -2414,6 +2463,11 @@ template <class ELFT> void LinkerDriver::link(opt::Inp
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// optimizations such as DATA_SEGMENT_ALIGN in linker scripts. LLD's use of it
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// is limited to writing trap instructions on the last executable segment.
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config->commonPageSize = getCommonPageSize(args);
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+ // textAlignPageSize is the alignment page size to use when aligning PT_LOAD
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+ // sections. This is the same as maxPageSize except under -omagic, where data
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+ // sections are non-aligned (maxPageSize set to 1) but text sections are aligned
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+ // to the target page size.
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+ config->textAlignPageSize = config->omagic ? getRealMaxPageSize(args) : config->maxPageSize;
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config->imageBase = getImageBase(args);
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