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For PE format files, the base relocation table is necessary if the image is loaded at a different image base than specified in the PE header. This patch provides a new option --enable-reloc-section to force the generation of this section.
* emultempl/pe.em: Add new option --enable-reloc-section. * emultempl/pep.em: Likewise. * ld.texi: Document --enable-reloc-section. * pe-dll.c (pe_dll_build_sections): Use pe_dll_enable_reloc_section. (pe_dll_fill_sections): Simplify by calling pe_exe_fill_sections. * pe-dll.h: Add extern declaration of option flag. * pep-dll.c (pe_dll_enable_reloc_section): Add alias define for pep_dll_enable_reloc_section. * pep-dll.h: Add extern declaration of option flag.
This commit is contained in:
Hannes Domani
Nick Clifton
parent
b26a3d5827
commit
dc9bd8c92a
12
ld/ChangeLog
12
ld/ChangeLog
@ -1,3 +1,15 @@
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2020-01-03 Hannes Domani <ssbssa@yahoo.de>
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* emultempl/pe.em: Add new option --enable-reloc-section.
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* emultempl/pep.em: Likewise.
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* ld.texi: Document --enable-reloc-section.
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* pe-dll.c (pe_dll_build_sections): Use pe_dll_enable_reloc_section.
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(pe_dll_fill_sections): Simplify by calling pe_exe_fill_sections.
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* pe-dll.h: Add extern declaration of option flag.
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* pep-dll.c (pe_dll_enable_reloc_section):
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Add alias define for pep_dll_enable_reloc_section.
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* pep-dll.h: Add extern declaration of option flag.
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2020-01-02 Sergey Belyashov <sergey.belyashov@gmail.com>
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* Makefile.am: Add new target z80-elf
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@ -270,6 +270,7 @@ fragment <<EOF
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#define OPTION_INSERT_TIMESTAMP (OPTION_TERMINAL_SERVER_AWARE + 1)
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#define OPTION_NO_INSERT_TIMESTAMP (OPTION_INSERT_TIMESTAMP + 1)
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#define OPTION_BUILD_ID (OPTION_NO_INSERT_TIMESTAMP + 1)
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#define OPTION_ENABLE_RELOC_SECTION (OPTION_BUILD_ID + 1)
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static void
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gld${EMULATION_NAME}_add_options
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@ -349,6 +350,7 @@ gld${EMULATION_NAME}_add_options
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{"wdmdriver", no_argument, NULL, OPTION_WDM_DRIVER},
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{"tsaware", no_argument, NULL, OPTION_TERMINAL_SERVER_AWARE},
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{"build-id", optional_argument, NULL, OPTION_BUILD_ID},
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{"enable-reloc-section", no_argument, NULL, OPTION_ENABLE_RELOC_SECTION},
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{NULL, no_argument, NULL, 0}
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};
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@ -483,6 +485,7 @@ gld_${EMULATION_NAME}_list_options (FILE *file)
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in object files\n"));
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fprintf (file, _(" --dynamicbase Image base address may be relocated using\n\
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address space layout randomization (ASLR)\n"));
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fprintf (file, _(" --enable-reloc-section Create the base relocation table\n"));
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fprintf (file, _(" --forceinteg Code integrity checks are enforced\n"));
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fprintf (file, _(" --nxcompat Image is compatible with data execution prevention\n"));
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fprintf (file, _(" --no-isolation Image understands isolation but do not isolate the image\n"));
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@ -855,6 +858,9 @@ gld${EMULATION_NAME}_handle_option (int optc)
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/* Get DLLCharacteristics bits */
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case OPTION_DYNAMIC_BASE:
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pe_dll_characteristics |= IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE;
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/* fall through */
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case OPTION_ENABLE_RELOC_SECTION:
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pe_dll_enable_reloc_section = 1;
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break;
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case OPTION_FORCE_INTEGRITY:
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pe_dll_characteristics |= IMAGE_DLL_CHARACTERISTICS_FORCE_INTEGRITY;
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@ -1947,6 +1953,7 @@ gld_${EMULATION_NAME}_finish (void)
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#ifdef DLL_SUPPORT
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if (bfd_link_pic (&link_info)
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#if !defined(TARGET_IS_shpe)
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|| pe_dll_enable_reloc_section
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|| (!bfd_link_relocatable (&link_info)
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&& pe_def_file->num_exports != 0)
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#endif
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@ -247,7 +247,8 @@ enum options
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OPTION_INSERT_TIMESTAMP,
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OPTION_NO_INSERT_TIMESTAMP,
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OPTION_TERMINAL_SERVER_AWARE,
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OPTION_BUILD_ID
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OPTION_BUILD_ID,
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OPTION_ENABLE_RELOC_SECTION
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};
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static void
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@ -325,6 +326,7 @@ gld${EMULATION_NAME}_add_options
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{"insert-timestamp", no_argument, NULL, OPTION_INSERT_TIMESTAMP},
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{"no-insert-timestamp", no_argument, NULL, OPTION_NO_INSERT_TIMESTAMP},
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{"build-id", optional_argument, NULL, OPTION_BUILD_ID},
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{"enable-reloc-section", no_argument, NULL, OPTION_ENABLE_RELOC_SECTION},
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{NULL, no_argument, NULL, 0}
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};
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@ -448,6 +450,7 @@ gld_${EMULATION_NAME}_list_options (FILE *file)
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layout randomization (ASLR)\n"));
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fprintf (file, _(" --dynamicbase Image base address may be relocated using\n\
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address space layout randomization (ASLR)\n"));
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fprintf (file, _(" --enable-reloc-section Create the base relocation table\n"));
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fprintf (file, _(" --forceinteg Code integrity checks are enforced\n"));
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fprintf (file, _(" --nxcompat Image is compatible with data execution prevention\n"));
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fprintf (file, _(" --no-isolation Image understands isolation but do not isolate the image\n"));
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@ -799,9 +802,12 @@ gld${EMULATION_NAME}_handle_option (int optc)
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/* Get DLLCharacteristics bits */
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case OPTION_HIGH_ENTROPY_VA:
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pe_dll_characteristics |= IMAGE_DLL_CHARACTERISTICS_HIGH_ENTROPY_VA;
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break;
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/* fall through */
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case OPTION_DYNAMIC_BASE:
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pe_dll_characteristics |= IMAGE_DLL_CHARACTERISTICS_DYNAMIC_BASE;
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/* fall through */
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case OPTION_ENABLE_RELOC_SECTION:
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pep_dll_enable_reloc_section = 1;
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break;
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case OPTION_FORCE_INTEGRITY:
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pe_dll_characteristics |= IMAGE_DLL_CHARACTERISTICS_FORCE_INTEGRITY;
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@ -1755,6 +1761,7 @@ gld_${EMULATION_NAME}_finish (void)
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#ifdef DLL_SUPPORT
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if (bfd_link_pic (&link_info)
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|| pep_dll_enable_reloc_section
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|| (!bfd_link_relocatable (&link_info)
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&& pep_def_file->num_exports != 0))
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{
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@ -2995,12 +2995,15 @@ of the PE file header:
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@item --high-entropy-va
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Image is compatible with 64-bit address space layout randomization
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(ASLR).
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This option also implies @option{--dynamicbase} and
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@option{--enable-reloc-section}.
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@kindex --dynamicbase
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@item --dynamicbase
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The image base address may be relocated using address space layout
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randomization (ASLR). This feature was introduced with MS Windows
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Vista for i386 PE targets.
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This option also implies @option{--enable-reloc-section}.
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@kindex --forceinteg
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@item --forceinteg
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@ -3043,6 +3046,11 @@ same sources are linked. The option @option{--no-insert-timestamp}
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can be used to insert a zero value for the timestamp, this ensuring
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that binaries produced from identical sources will compare
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identically.
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@kindex --enable-reloc-section
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@item --enable-reloc-section
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Create the base relocation table, which is necessary if the image
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is loaded at a different image base than specified in the PE header.
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@end table
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@c man end
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35
ld/pe-dll.c
35
ld/pe-dll.c
@ -160,6 +160,7 @@ int pe_dll_extra_pe_debug = 0;
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int pe_use_nul_prefixed_import_tables = 0;
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int pe_use_coff_long_section_names = -1;
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int pe_leading_underscore = -1;
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int pe_dll_enable_reloc_section = 0;
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/* Static variables and types. */
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@ -3554,7 +3555,14 @@ pe_dll_build_sections (bfd *abfd, struct bfd_link_info *info)
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process_def_file_and_drectve (abfd, info);
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if (pe_def_file->num_exports == 0 && !bfd_link_pic (info))
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return;
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{
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if (pe_dll_enable_reloc_section)
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{
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build_filler_bfd (0);
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pe_output_file_set_long_section_names (filler_bfd);
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}
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return;
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}
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generate_edata (abfd, info);
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build_filler_bfd (1);
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@ -3573,33 +3581,16 @@ pe_exe_build_sections (bfd *abfd, struct bfd_link_info *info ATTRIBUTE_UNUSED)
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void
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pe_dll_fill_sections (bfd *abfd, struct bfd_link_info *info)
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{
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pe_dll_id_target (bfd_get_target (abfd));
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pe_output_file_set_long_section_names (abfd);
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image_base = pe_data (abfd)->pe_opthdr.ImageBase;
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pe_exe_fill_sections (abfd, info);
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generate_reloc (abfd, info);
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if (reloc_sz > 0)
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if (edata_s)
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{
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bfd_set_section_size (reloc_s, reloc_sz);
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/* Resize the sections. */
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lang_reset_memory_regions ();
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lang_size_sections (NULL, TRUE);
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/* Redo special stuff. */
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ldemul_after_allocation ();
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/* Do the assignments again. */
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lang_do_assignments (lang_final_phase_enum);
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fill_edata (abfd, info);
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edata_s->contents = edata_d;
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}
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fill_edata (abfd, info);
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if (bfd_link_dll (info))
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pe_data (abfd)->dll = 1;
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edata_s->contents = edata_d;
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reloc_s->contents = reloc_d;
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}
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void
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@ -38,6 +38,7 @@ extern int pe_dll_extra_pe_debug;
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extern int pe_use_nul_prefixed_import_tables;
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extern int pe_use_coff_long_section_names;
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extern int pe_leading_underscore;
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extern int pe_dll_enable_reloc_section;
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typedef enum { EXCLUDESYMS, EXCLUDELIBS, EXCLUDEFORIMPLIB } exclude_type;
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@ -39,6 +39,7 @@
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#define pe_use_coff_long_section_names \
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pep_use_coff_long_section_names
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#define pe_leading_underscore pep_leading_underscore
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#define pe_dll_enable_reloc_section pep_dll_enable_reloc_section
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/* Unique global name for functions to avoid double defined symbols. */
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#define pe_find_data_imports pep_find_data_imports
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@ -39,6 +39,7 @@ extern int pep_dll_extra_pe_debug;
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extern int pep_use_nul_prefixed_import_tables;
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extern int pep_use_coff_long_section_names;
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extern int pep_leading_underscore;
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extern int pep_dll_enable_reloc_section;
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typedef enum { EXCLUDESYMS, EXCLUDELIBS, EXCLUDEFORIMPLIB } exclude_type;
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