gold: Get alignment of uncompressed section from ch_addralign
The ELF compression header has a field (ch_addralign) that is set to the alignment of the uncompressed section. This way the section itself can have a different alignment than the decompressed section. Update decompress_input_section to get alignment of the decompressed section and use it when merging decompressed strings. PR binutils/23919 * merge.cc (Output_merge_string<Char_type>::do_add_input_section): Get addralign from decompressed_section_contents. * object.cc (build_compressed_section_map): Set info.addralign. (Object::decompressed_section_contents): Add a palign argument and store p->second.addralign in *palign if it isn't NULL. * object.h (Compressed_section_info): Add addralign. (section_is_compressed): Add a palign argument, default it to NULL, store p->second.addralign in *palign if it isn't NULL. (Object::decompressed_section_contents): Likewise. * output.cc (Output_section::add_input_section): Get addralign from section_is_compressed.
This commit is contained in:
H.J. Lu
parent
3134061ce6
commit
5f6c22aee7
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@ -1,3 +1,19 @@
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2018-12-02 H.J. Lu <hongjiu.lu@intel.com>
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PR binutils/23919
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* merge.cc (Output_merge_string<Char_type>::do_add_input_section):
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Get addralign from decompressed_section_contents.
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* object.cc (build_compressed_section_map): Set info.addralign.
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(Object::decompressed_section_contents): Add a palign
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argument and store p->second.addralign in *palign if it isn't
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NULL.
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* object.h (Compressed_section_info): Add addralign.
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(section_is_compressed): Add a palign argument, default it
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to NULL, store p->second.addralign in *palign if it isn't NULL.
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(Object::decompressed_section_contents): Likewise.
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* output.cc (Output_section::add_input_section): Get addralign
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from section_is_compressed.
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2018-11-26 Alan Modra <amodra@gmail.com>
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* testsuite/Makefile.am (justsyms_lib): Link with -z norelro.
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@ -440,9 +440,11 @@ Output_merge_string<Char_type>::do_add_input_section(Relobj* object,
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{
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section_size_type sec_len;
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bool is_new;
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uint64_t addralign = this->addralign();
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const unsigned char* pdata = object->decompressed_section_contents(shndx,
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&sec_len,
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&is_new);
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&is_new,
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&addralign);
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const Char_type* p = reinterpret_cast<const Char_type*>(pdata);
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const Char_type* pend = p + sec_len / sizeof(Char_type);
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@ -494,7 +496,7 @@ Output_merge_string<Char_type>::do_add_input_section(Relobj* object,
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// aligned, so each string within the section must retain the same
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// modulo.
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uintptr_t init_align_modulo = (reinterpret_cast<uintptr_t>(pdata)
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& (this->addralign() - 1));
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& (addralign - 1));
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bool has_misaligned_strings = false;
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while (p < pend)
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@ -503,7 +505,7 @@ Output_merge_string<Char_type>::do_add_input_section(Relobj* object,
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// Within merge input section each string must be aligned.
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if (len != 0
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&& ((reinterpret_cast<uintptr_t>(p) & (this->addralign() - 1))
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&& ((reinterpret_cast<uintptr_t>(p) & (addralign - 1))
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!= init_align_modulo))
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has_misaligned_strings = true;
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@ -751,11 +751,13 @@ build_compressed_section_map(
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const unsigned char* contents =
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obj->section_contents(i, &len, false);
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uint64_t uncompressed_size;
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Compressed_section_info info;
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if (is_zcompressed)
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{
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// Skip over the ".zdebug" prefix.
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name += 7;
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uncompressed_size = get_uncompressed_size(contents, len);
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info.addralign = shdr.get_sh_addralign();
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}
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else
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{
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@ -763,8 +765,8 @@ build_compressed_section_map(
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name += 6;
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elfcpp::Chdr<size, big_endian> chdr(contents);
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uncompressed_size = chdr.get_ch_size();
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info.addralign = chdr.get_ch_addralign();
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}
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Compressed_section_info info;
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info.size = convert_to_section_size_type(uncompressed_size);
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info.flag = shdr.get_sh_flags();
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info.contents = NULL;
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@ -3064,7 +3066,8 @@ const unsigned char*
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Object::decompressed_section_contents(
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unsigned int shndx,
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section_size_type* plen,
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bool* is_new)
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bool* is_new,
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uint64_t* palign)
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{
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section_size_type buffer_size;
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const unsigned char* buffer = this->do_section_contents(shndx, &buffer_size,
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@ -3091,6 +3094,8 @@ Object::decompressed_section_contents(
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{
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*plen = uncompressed_size;
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*is_new = false;
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if (palign != NULL)
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*palign = p->second.addralign;
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return p->second.contents;
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}
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@ -3112,6 +3117,8 @@ Object::decompressed_section_contents(
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// once in this pass.
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*plen = uncompressed_size;
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*is_new = true;
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if (palign != NULL)
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*palign = p->second.addralign;
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return uncompressed_data;
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}
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@ -373,6 +373,7 @@ struct Compressed_section_info
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{
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section_size_type size;
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elfcpp::Elf_Xword flag;
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uint64_t addralign;
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const unsigned char* contents;
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};
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typedef std::map<unsigned int, Compressed_section_info> Compressed_section_map;
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@ -808,7 +809,8 @@ class Object
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bool
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section_is_compressed(unsigned int shndx,
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section_size_type* uncompressed_size) const
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section_size_type* uncompressed_size,
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elfcpp::Elf_Xword* palign = NULL) const
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{
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if (this->compressed_sections_ == NULL)
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return false;
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@ -818,6 +820,8 @@ class Object
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{
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if (uncompressed_size != NULL)
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*uncompressed_size = p->second.size;
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if (palign != NULL)
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*palign = p->second.addralign;
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return true;
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}
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return false;
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@ -828,7 +832,7 @@ class Object
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// by the caller.
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const unsigned char*
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decompressed_section_contents(unsigned int shndx, section_size_type* plen,
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bool* is_cached);
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bool* is_cached, uint64_t* palign = NULL);
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// Discard any buffers of decompressed sections. This is done
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// at the end of the Add_symbols task.
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@ -2448,7 +2448,13 @@ Output_section::add_input_section(Layout* layout,
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unsigned int reloc_shndx,
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bool have_sections_script)
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{
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section_size_type input_section_size = shdr.get_sh_size();
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section_size_type uncompressed_size;
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elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
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if (object->section_is_compressed(shndx, &uncompressed_size,
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&addralign))
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input_section_size = uncompressed_size;
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if ((addralign & (addralign - 1)) != 0)
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{
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object->error(_("invalid alignment %lu for section \"%s\""),
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@ -2498,11 +2504,6 @@ Output_section::add_input_section(Layout* layout,
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}
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}
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section_size_type input_section_size = shdr.get_sh_size();
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section_size_type uncompressed_size;
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if (object->section_is_compressed(shndx, &uncompressed_size))
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input_section_size = uncompressed_size;
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off_t offset_in_section;
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if (this->has_fixed_layout())
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