Fix for PR 19070 - add ability to detect and generate errors when sections
overlap.
This commit is contained in:
parent
39c80401ec
commit
22f94ab06c
17
ld/ChangeLog
17
ld/ChangeLog
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@ -1,3 +1,20 @@
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1999-02-11 Nick Clifton <nickc@cygnus.com>
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* ldlang.c (lang_check_section_addresses): New function: Check
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addresses assigned to section for overlaps.
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(lang_process): Call lang_check_section_addresses if suitable.
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* ld.h: Add new boolean field to args_type structure:
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'check_section_addresses'.
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* ldmain.c: Initialise check_section_addresses field to true.
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* lexsup.c: Add new command line options '--no-check-sections' and
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'--check-sections'.
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* ld.texinfo: Document new command line options '--check-sections'
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and '--no-check-sections'.
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1999-02-08 Nick Clifton <nickc@cygnus.com>
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* configure.tgt: Add support for StrongARM target.
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66
ld/ldlang.c
66
ld/ldlang.c
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@ -1,5 +1,5 @@
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/* Linker command language support.
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 1998
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 1999
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Free Software Foundation, Inc.
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This file is part of GLD, the Gnu Linker.
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@ -152,6 +152,7 @@ static void lang_gc_wild
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static void lang_gc_sections_1 PARAMS ((lang_statement_union_type *));
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static void lang_gc_sections PARAMS ((void));
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static void lang_do_version_exports_section PARAMS ((void));
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static void lang_check_section_addresses PARAMS ((void));
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/* EXPORTS */
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@ -2272,6 +2273,61 @@ size_input_section (this_ptr, output_section_statement, fill, dot, relax)
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return dot;
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}
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/* Check to see if any allocated sections overlap with other allocated
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sections. This can happen when the linker script specifically specifies
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the output section addresses of the two sections. */
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static void
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lang_check_section_addresses ()
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{
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asection * s;
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/* Scan all sections in the output list. */
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for (s = output_bfd->sections; s != NULL; s = s->next)
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/* Ignore sections which are not loaded or which have no contents. */
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if ((bfd_get_section_flags (output_bfd, s) & (SEC_ALLOC | SEC_LOAD))
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&& bfd_section_size (output_bfd, s) != 0)
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{
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asection * os;
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/* Once we reach section 's' stop our seach. This prevents two
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warning messages from being produced, one for 'section A overlaps
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section B' and one for 'section B overlaps section A'. */
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for (os = output_bfd->sections; os != s; os = os->next)
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{
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bfd_vma s_start;
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bfd_vma s_end;
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bfd_vma os_start;
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bfd_vma os_end;
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/* Only consider loadable sections with real contents. */
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if (((bfd_get_section_flags (output_bfd, os)
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& (SEC_ALLOC | SEC_LOAD)) == 0)
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|| bfd_section_size (output_bfd, os) == 0)
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continue;
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/* We must check the sections' LMA addresses not their
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VMA addresses because overlay sections can have
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overlapping VMAs but they must have distinct LMAs. */
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s_start = bfd_section_lma (output_bfd, s);
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os_start = bfd_section_lma (output_bfd, os);
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s_end = s_start + bfd_section_size (output_bfd, s) - 1;
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os_end = os_start + bfd_section_size (output_bfd, os) - 1;
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/* Look for an overlap. */
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if ((s_end < os_start) || (s_start > os_end))
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continue;
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einfo (_(\
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"%X%P: section %s [%V -> %V] overlaps section %s [%V -> %V]\n"),
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s->name, s_start, s_end, os->name, os_start, os_end);
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/* Once we have found one overlap for this section,
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stop looking for others. */
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break;
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}
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}
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}
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/* This variable indicates whether bfd_relax_section should be called
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again. */
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@ -2421,7 +2477,8 @@ lang_size_sections (s, output_section_statement, prev, fill, dot, relax)
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since unallocated sections do not contribute to the region's
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overall size in memory. */
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if (os->region != (lang_memory_region_type *) NULL
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&& bfd_get_section_flags (output_bfd, os->bfd_section) & SEC_ALLOC)
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&& (bfd_get_section_flags (output_bfd, os->bfd_section)
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& (SEC_ALLOC | SEC_LOAD)))
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{
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os->region->current = dot;
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@ -3713,6 +3770,11 @@ lang_process ()
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abs_output_section,
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(fill_type) 0, (bfd_vma) 0);
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/* Make sure that the section addresses make sense. */
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if (! link_info.relocateable
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&& command_line.check_section_addresses)
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lang_check_section_addresses ();
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/* Final stuffs */
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ldemul_finish ();
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@ -199,6 +199,7 @@ main (argc, argv)
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command_line.interpreter = NULL;
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command_line.rpath = NULL;
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command_line.warn_mismatch = true;
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command_line.check_section_addresses = true;
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link_info.callbacks = &link_callbacks;
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link_info.relocateable = false;
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@ -246,9 +247,6 @@ main (argc, argv)
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einfo (_("%P%F: -r and -shared may not be used together\n"));
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}
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if (command_line.gc_sections && config.dynamic_link)
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einfo("%P%F: --gc-sections may only be performed for static links\n");
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/* Treat ld -r -s as ld -r -S -x (i.e., strip all local symbols). I
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don't see how else this can be handled, since in this case we
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must preserve all externally visible symbols. */
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93
ld/lexsup.c
93
ld/lexsup.c
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@ -101,7 +101,8 @@ int parsing_defsym = 0;
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#define OPTION_VERBOSE (OPTION_UR + 1)
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#define OPTION_VERSION (OPTION_VERBOSE + 1)
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#define OPTION_VERSION_SCRIPT (OPTION_VERSION + 1)
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#define OPTION_WARN_COMMON (OPTION_VERSION_SCRIPT + 1)
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#define OPTION_VERSION_EXPORTS_SECTION (OPTION_VERSION_SCRIPT + 1)
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#define OPTION_WARN_COMMON (OPTION_VERSION_EXPORTS_SECTION + 1)
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#define OPTION_WARN_CONSTRUCTORS (OPTION_WARN_COMMON + 1)
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#define OPTION_WARN_MULTIPLE_GP (OPTION_WARN_CONSTRUCTORS + 1)
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#define OPTION_WARN_ONCE (OPTION_WARN_MULTIPLE_GP + 1)
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@ -113,6 +114,8 @@ int parsing_defsym = 0;
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#define OPTION_FORCE_EXE_SUFFIX (OPTION_WRAP + 1)
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#define OPTION_GC_SECTIONS (OPTION_FORCE_EXE_SUFFIX + 1)
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#define OPTION_NO_GC_SECTIONS (OPTION_GC_SECTIONS + 1)
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#define OPTION_CHECK_SECTIONS (OPTION_NO_GC_SECTIONS + 1)
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#define OPTION_NO_CHECK_SECTIONS (OPTION_CHECK_SECTIONS + 1)
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/* The long options. This structure is used for both the option
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parsing and the help text. */
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@ -158,6 +161,10 @@ static const struct ld_option ld_options[] =
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'e', N_("ADDRESS"), N_("Set start address"), TWO_DASHES },
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{ {"export-dynamic", no_argument, NULL, OPTION_EXPORT_DYNAMIC},
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'E', NULL, N_("Export all dynamic symbols"), TWO_DASHES },
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{ {"EB", no_argument, NULL, OPTION_EB},
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'\0', NULL, N_("Link big-endian objects"), ONE_DASH },
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{ {"EL", no_argument, NULL, OPTION_EL},
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'\0', NULL, N_("Link little-endian objects"), ONE_DASH },
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{ {"auxiliary", required_argument, NULL, 'f'},
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'f', N_("SHLIB"), N_("Auxiliary filter for shared object symbol table"),
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TWO_DASHES },
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@ -165,12 +172,6 @@ static const struct ld_option ld_options[] =
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'F', N_("SHLIB"), N_("Filter for shared object symbol table"), TWO_DASHES },
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{ {NULL, no_argument, NULL, '\0'},
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'g', NULL, N_("Ignored"), ONE_DASH },
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{ {"gc-sections", no_argument, NULL, OPTION_GC_SECTIONS},
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'\0', NULL, N_("Remove unused sections on certain targets"),
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TWO_DASHES },
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{ {"no-gc-sections", no_argument, NULL, OPTION_NO_GC_SECTIONS},
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'\0', NULL, N_("(Don't) Remove unused sections on certain targets"),
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TWO_DASHES },
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{ {"gpsize", required_argument, NULL, 'G'},
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'G', N_("SIZE"), N_("Small data size (if no size, same as --shared)"),
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TWO_DASHES },
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@ -192,7 +193,9 @@ static const struct ld_option ld_options[] =
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{ {"output", required_argument, NULL, 'o'},
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'o', N_("FILE"), N_("Set output file name"), TWO_DASHES },
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{ {NULL, required_argument, NULL, '\0'},
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'O', NULL, N_("Ignored"), ONE_DASH },
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'O', NULL, N_("Optimize output file"), ONE_DASH },
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{ {"Qy", no_argument, NULL, OPTION_IGNORE},
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'\0', NULL, N_("Ignored for SVR4 compatibility"), ONE_DASH },
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{ {"relocateable", no_argument, NULL, 'r'},
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'r', NULL, N_("Generate relocateable output"), TWO_DASHES },
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{ {NULL, no_argument, NULL, '\0'},
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@ -210,6 +213,8 @@ static const struct ld_option ld_options[] =
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'T', N_("FILE"), N_("Read linker script"), TWO_DASHES },
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{ {"undefined", required_argument, NULL, 'u'},
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'u', N_("SYMBOL"), N_("Start with undefined reference to SYMBOL"), TWO_DASHES },
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{ {"Ur", no_argument, NULL, OPTION_UR},
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'\0', NULL, N_("Build global constructor/destructor tables"), ONE_DASH },
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{ {"version", no_argument, NULL, OPTION_VERSION},
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'v', NULL, N_("Print version information"), TWO_DASHES },
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{ {NULL, no_argument, NULL, '\0'},
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@ -246,20 +251,27 @@ static const struct ld_option ld_options[] =
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'\0', NULL, NULL, ONE_DASH },
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{ {"Bsymbolic", no_argument, NULL, OPTION_SYMBOLIC},
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'\0', NULL, N_("Bind global references locally"), ONE_DASH },
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{ {"check-sections", no_argument, NULL, OPTION_CHECK_SECTIONS},
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'\0', NULL, N_("Check section addresses for overlaps (default)"), TWO_DASHES },
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{ {"no-check-sections", no_argument, NULL, OPTION_NO_CHECK_SECTIONS},
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'\0', NULL, N_("Do not check section addresses for overlaps"),
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TWO_DASHES },
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{ {"cref", no_argument, NULL, OPTION_CREF},
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'\0', NULL, N_("Output cross reference table"), TWO_DASHES },
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{ {"defsym", required_argument, NULL, OPTION_DEFSYM},
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'\0', N_("SYMBOL=EXPRESSION"), N_("Define a symbol"), TWO_DASHES },
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{ {"dynamic-linker", required_argument, NULL, OPTION_DYNAMIC_LINKER},
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'\0', N_("PROGRAM"), N_("Set the dynamic linker to use"), TWO_DASHES },
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{ {"EB", no_argument, NULL, OPTION_EB},
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'\0', NULL, N_("Link big-endian objects"), ONE_DASH },
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{ {"EL", no_argument, NULL, OPTION_EL},
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'\0', NULL, N_("Link little-endian objects"), ONE_DASH },
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{ {"embedded-relocs", no_argument, NULL, OPTION_EMBEDDED_RELOCS},
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'\0', NULL, N_("Generate embedded relocs"), TWO_DASHES},
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{ {"force-exe-suffix", no_argument, NULL, OPTION_FORCE_EXE_SUFFIX},
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'\0', NULL, N_("Force generation of file with .exe suffix"), TWO_DASHES},
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{ {"gc-sections", no_argument, NULL, OPTION_GC_SECTIONS},
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'\0', NULL, N_("Remove unused sections (on some targets)"),
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TWO_DASHES },
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{ {"no-gc-sections", no_argument, NULL, OPTION_NO_GC_SECTIONS},
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'\0', NULL, N_("Don't remove unused sections (default)"),
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TWO_DASHES },
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{ {"help", no_argument, NULL, OPTION_HELP},
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'\0', NULL, N_("Print option help"), TWO_DASHES },
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{ {"Map", required_argument, NULL, OPTION_MAP},
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@ -278,8 +290,6 @@ static const struct ld_option ld_options[] =
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'\0', N_("TARGET"), N_("Specify target of output file"), TWO_DASHES },
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{ {"qmagic", no_argument, NULL, OPTION_IGNORE},
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'\0', NULL, N_("Ignored for Linux compatibility"), ONE_DASH },
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{ {"Qy", no_argument, NULL, OPTION_IGNORE},
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'\0', NULL, N_("Ignored for SVR4 compatibility"), ONE_DASH },
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{ {"relax", no_argument, NULL, OPTION_RELAX},
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'\0', NULL, N_("Relax branches on certain targets"), TWO_DASHES },
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{ {"retain-symbols-file", required_argument, NULL,
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@ -313,14 +323,16 @@ static const struct ld_option ld_options[] =
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'\0', N_("ADDRESS"), N_("Set address of .data section"), ONE_DASH },
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{ {"Ttext", required_argument, NULL, OPTION_TTEXT},
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'\0', N_("ADDRESS"), N_("Set address of .text section"), ONE_DASH },
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{ {"Ur", no_argument, NULL, OPTION_UR},
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'\0', NULL, N_("Build global constructor/destructor tables"), ONE_DASH },
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{ {"verbose", no_argument, NULL, OPTION_VERBOSE},
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'\0', NULL, N_("Output lots of information during link"), TWO_DASHES },
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{ {"dll-verbose", no_argument, NULL, OPTION_VERBOSE}, /* Linux. */
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'\0', NULL, NULL, NO_HELP },
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{ {"version-script", required_argument, NULL, OPTION_VERSION_SCRIPT },
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'\0', N_("FILE"), N_("Read version information script"), TWO_DASHES },
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{ {"version-exports-section", required_argument, NULL,
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OPTION_VERSION_EXPORTS_SECTION },
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'\0', N_("SYMBOL"), N_("Take export symbols list from .exports, using SYMBOL as the version."),
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TWO_DASHES },
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{ {"warn-common", no_argument, NULL, OPTION_WARN_COMMON},
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'\0', NULL, N_("Warn about duplicate common symbols"), TWO_DASHES },
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{ {"warn-constructors", no_argument, NULL, OPTION_WARN_CONSTRUCTORS},
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@ -636,6 +648,9 @@ parse_args (argc, argv)
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something, or can we create a new option to do that
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(with a syntax similar to -defsym)?
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getopt can't handle two args to an option without kludges. */
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/* Enable optimizations of output files. */
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link_info.optimize = strtoul (optarg, NULL, 0) ? true : false;
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break;
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case 'o':
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lang_add_output (optarg, 0);
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@ -677,14 +692,36 @@ parse_args (argc, argv)
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command_line.rpath = buystring (optarg);
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else
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{
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size_t rpath_len = strlen (command_line.rpath);
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size_t optarg_len = strlen (optarg);
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char *buf;
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char *cp = command_line.rpath;
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buf = xmalloc (strlen (command_line.rpath)
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+ strlen (optarg)
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+ 2);
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sprintf (buf, "%s:%s", command_line.rpath, optarg);
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free (command_line.rpath);
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command_line.rpath = buf;
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/* First see whether OPTARG is already in the path. */
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do
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{
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size_t idx = 0;
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while (optarg[idx] != '\0' && optarg[idx] == cp[idx])
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++idx;
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if (optarg[idx] == '\0'
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&& (cp[idx] == '\0' || cp[idx] == ':'))
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/* We found it. */
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break;
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/* Not yet found. */
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cp = strchr (cp, ':');
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if (cp != NULL)
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++cp;
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}
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while (cp != NULL);
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if (cp == NULL)
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{
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buf = xmalloc (rpath_len + optarg_len + 2);
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sprintf (buf, "%s:%s", command_line.rpath, optarg);
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free (command_line.rpath);
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command_line.rpath = buf;
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}
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}
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break;
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case OPTION_RPATH_LINK:
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@ -812,6 +849,12 @@ the GNU General Public License. This program has absolutely no warranty.\n"));
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yyparse ();
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}
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break;
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case OPTION_VERSION_EXPORTS_SECTION:
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/* This option records a version symbol to be applied to the
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symbols listed for export to be found in the object files
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.exports sections. */
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command_line.version_exports_section = optarg;
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break;
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case OPTION_WARN_COMMON:
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config.warn_common = true;
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break;
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@ -858,6 +901,12 @@ the GNU General Public License. This program has absolutely no warranty.\n"));
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case OPTION_SPLIT_BY_FILE:
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config.split_by_file = true;
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break;
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case OPTION_CHECK_SECTIONS:
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command_line.check_section_addresses = true;
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break;
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case OPTION_NO_CHECK_SECTIONS:
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command_line.check_section_addresses = false;
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break;
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case '(':
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if (ingroup)
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{
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@ -37,6 +37,7 @@ ld-shared
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ld-srec
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ld-undefined
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ld-versados
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ld-checks
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Things-to-lose:
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@ -1,3 +1,23 @@
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1999-02-11 Nick Clifton <nickc@cygnus.com>
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* ld-checks: New directory: Tests for the linker's
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--check-sections option.
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* ld-checks/checks.exp: New file.
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* ld-checks/script: Bogus linker script.
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* ld-checks/asm.s: Simple test assembler file.
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Tue Feb 2 19:15:02 1999 Catherine Moore <clm@cygnus.com>
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* ld-selective/selective.exp: Disable test for unsupported
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targets. Change tests to check for absence of symbols instead
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of address zero.
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Mon Jan 18 03:44:52 1999 Ian Lance Taylor <ian@cygnus.com>
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* config/default.exp (get_link_files): Quote target_triplet and CC
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when invoking shell.
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(get_target_emul): Likewise.
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1999-01-03 Ken Raeburn <raeburn@cygnus.com>
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* config/default.exp (get_link_files, get_target_emul): New procs;
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@ -0,0 +1,45 @@
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# .Sanitize for ld dejagnu testsuites
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# Each directory to survive it's way into a release will need a file
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# like this one called "./.Sanitize". All keyword lines must exist,
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# and must exist in the order specified by this file. Each directory
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# in the tree will be processed, top down, in the following order..
|
||||
|
||||
# Hash started lines like this one are comments and will be deleted
|
||||
# before anything else is done. Blank lines will also be squashed
|
||||
# out.
|
||||
|
||||
# The lines between the "Do-first:" line and the "Things-to-keep:"
|
||||
# line are executed as a /bin/sh shell script before anything else is
|
||||
# done in this directory.
|
||||
|
||||
Do-first:
|
||||
|
||||
# All files listed between the "Things-to-keep:" line and the
|
||||
# "Do-last:" line will be kept. All other files will be removed.
|
||||
# Directories listed in this section will have their own Sanitize
|
||||
# called. Directories not listed will be removed in their entirety
|
||||
# with rm -rf.
|
||||
|
||||
Things-to-keep:
|
||||
|
||||
asm.s
|
||||
script
|
||||
checks.exp
|
||||
|
||||
Things-to-lose:
|
||||
|
||||
# The lines between the "Do-last:" line and the end of the file
|
||||
# are executed as a /bin/sh shell script after everything else is
|
||||
# done.
|
||||
|
||||
Do-last:
|
||||
|
||||
|
||||
for i in * ; do
|
||||
if test ! -d $i && (grep sanitize $i > /dev/null) ; then
|
||||
echo '***' Some mentions of Sanitize are still left in $i! 1>&2
|
||||
fi
|
||||
done
|
||||
|
||||
#eof
|
|
@ -0,0 +1,21 @@
|
|||
.section .foo,"ax",@progbits
|
||||
.global foo
|
||||
foo:
|
||||
.word 0x12345678
|
||||
|
||||
.section .bar,"ax",@progbits
|
||||
.global bar
|
||||
bar:
|
||||
.word 0x87654321
|
||||
|
||||
.section .overlay1,"ax",@progbits;
|
||||
.global jim
|
||||
jim:
|
||||
.word 0xdeadbeef
|
||||
|
||||
.section .overlay2,"ax",@progbits
|
||||
.global harry
|
||||
harry:
|
||||
.word 0x99119911
|
||||
|
||||
|
|
@ -0,0 +1,72 @@
|
|||
# Expect script for LD section checks tests
|
||||
# Copyright (C) 1999 Free Software Foundation
|
||||
#
|
||||
# This file is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License as published by
|
||||
# the Free Software Foundation; either version 2 of the License, or
|
||||
# (at your option) any later version.
|
||||
#
|
||||
# This program is distributed in the hope that it will be useful,
|
||||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
# GNU General Public License for more details.
|
||||
#
|
||||
# You should have received a copy of the GNU General Public License
|
||||
# along with this program; if not, write to the Free Software
|
||||
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
||||
#
|
||||
# Written by Nick Clifton (nickc@cygnus.com)
|
||||
|
||||
proc section_check {} {
|
||||
global ld_flags
|
||||
global as
|
||||
global ld
|
||||
global srcdir
|
||||
global subdir
|
||||
|
||||
set test "check sections"
|
||||
|
||||
set ldflags "--check-sections"
|
||||
|
||||
if { ![ld_assemble $as $srcdir/$subdir/asm.s tmpdir/asm.o]} {
|
||||
unresolved $test
|
||||
return
|
||||
}
|
||||
|
||||
if ![ld_simple_link $ld tmpdir/asm.x "$ldflags tmpdir/asm.o"] {
|
||||
fail "$test : using default linker script"
|
||||
} else {
|
||||
pass $test
|
||||
}
|
||||
|
||||
# Change the linker flags so that our "buggy" linker
|
||||
# script is used.
|
||||
set ldflags "--check-sections -T $srcdir/$subdir/script -e foo"
|
||||
|
||||
# Perform the equivalent of invoking ld_simple_link
|
||||
# except that we need to massage the output futher.
|
||||
|
||||
catch "exec $ld -o tmpdir/asm.x $ldflags tmpdir/asm.o" exec_output
|
||||
set exec_output [prune_warnings $exec_output]
|
||||
|
||||
# Make sure that we got some output from the linker
|
||||
if [string match "" $exec_output] then {
|
||||
fail "$test - error message expected but not found"
|
||||
}
|
||||
|
||||
# Now remove our expected error message
|
||||
regsub -all ".*: section .bar .* overlaps section .foo .*" $exec_output "" exec_output
|
||||
|
||||
# And check to see if anything else, (unexpected) was left
|
||||
if [string match "" $exec_output] then {
|
||||
pass $test
|
||||
} else {
|
||||
verbose -log "Unexpected linker message(s): $exec_output"
|
||||
|
||||
fail "$test - using erroneous linker script"
|
||||
}
|
||||
}
|
||||
|
||||
section_check
|
||||
|
||||
|
|
@ -0,0 +1,8 @@
|
|||
SECTIONS {
|
||||
.foo 0x100 : { *(.foo) }
|
||||
.bar 0x100 : AT (0x100) { *(.bar) }
|
||||
|
||||
.overlay1 0x100 : AT (0x4000) { *(.overlay1) }
|
||||
.overlay2 0x100 : AT (0x4004) { *(.overlay2) }
|
||||
}
|
||||
|
Loading…
Reference in New Issue