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| author | Cary Coutant <ccoutant@google.com> | 2014-11-25 13:55:42 -0800 |
|---|---|---|
| committer | Cary Coutant <ccoutant@google.com> | 2014-11-25 13:56:21 -0800 |
| commit | c924eb67e143722e4098d84c1cb91123a51c988f (patch) | |
| tree | 2e1410cddd8f1a119ea4e76e73cf1b481ad55c7c /gold/object.cc | |
| parent | 61e6682207163bfc02b2fc0c54c084cf8f2c5f10 (diff) | |
| download | gdb-c924eb67e143722e4098d84c1cb91123a51c988f.zip gdb-c924eb67e143722e4098d84c1cb91123a51c988f.tar.gz gdb-c924eb67e143722e4098d84c1cb91123a51c988f.tar.bz2 | |
Fix corrupted .eh_frame section with LTO and --gc-sections.
When --gc-sections is turned on during an LTO link, the .eh_frame sections
from deferred files are processed before those from the replacement files.
As a result, the section end-cap from crtendS.o is placed ahead of
the .eh_frame data from the replacement files. This patch fixes the bug
by skipping the layout of the deferred sections during GC pass 2.
gold/
PR gold/17639
* object.cc (Sized_relobj_file): Initialize is_deferred_layout_.
(Sized_relobj_file::do_layout): Handle deferred sections properly
during GC pass 1. Don't add reloc sections to deferred list twice.
* object.h (Sized_relobj_file::is_deferred_layout): New function.
(Sized_relobj_file::is_deferred_layout_): New data member.
Diffstat (limited to 'gold/object.cc')
| -rw-r--r-- | gold/object.cc | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/gold/object.cc b/gold/object.cc index 6ab84ce..e357ddf 100644 --- a/gold/object.cc +++ b/gold/object.cc @@ -430,6 +430,7 @@ Sized_relobj_file<size, big_endian>::Sized_relobj_file( kept_comdat_sections_(), has_eh_frame_(false), discarded_eh_frame_shndx_(-1U), + is_deferred_layout_(false), deferred_layout_(), deferred_layout_relocs_(), compressed_sections_() @@ -1430,6 +1431,7 @@ Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab, { parameters->options().plugins()->add_deferred_layout_object(this); this->deferred_layout_.reserve(num_sections_to_defer); + this->is_deferred_layout_ = true; } // Whether we've seen a .note.GNU-stack section. @@ -1590,10 +1592,13 @@ Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab, { if (is_pass_one) { - out_sections[i] = reinterpret_cast<Output_section*>(1); + if (this->is_deferred_layout()) + out_sections[i] = reinterpret_cast<Output_section*>(2); + else + out_sections[i] = reinterpret_cast<Output_section*>(1); out_section_offsets[i] = invalid_address; } - else if (should_defer_layout) + else if (this->is_deferred_layout()) this->deferred_layout_.push_back(Deferred_layout(i, name, pshdrs, reloc_shndx[i], @@ -1658,11 +1663,12 @@ Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab, } // Defer layout here if input files are claimed by plugins. When gc - // is turned on this function is called twice. For the second call - // should_defer_layout should be false. - if (should_defer_layout && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) + // is turned on this function is called twice; we only want to do this + // on the first pass. + if (!is_pass_two + && this->is_deferred_layout() + && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC)) { - gold_assert(!is_pass_two); this->deferred_layout_.push_back(Deferred_layout(i, name, pshdrs, reloc_shndx[i], @@ -1764,6 +1770,8 @@ Sized_relobj_file<size, big_endian>::do_layout(Symbol_table* symtab, Output_section* data_section = out_sections[data_shndx]; if (data_section == reinterpret_cast<Output_section*>(2)) { + if (is_pass_two) + continue; // The layout for the data section was deferred, so we need // to defer the relocation section, too. const char* name = pnames + shdr.get_sh_name(); |