diff options
Diffstat (limited to 'gold/arm.cc')
| -rw-r--r-- | gold/arm.cc | 46 |
1 files changed, 44 insertions, 2 deletions
diff --git a/gold/arm.cc b/gold/arm.cc index 694ef93..e6343ec 100644 --- a/gold/arm.cc +++ b/gold/arm.cc @@ -1178,6 +1178,10 @@ class Arm_relobj : public Sized_relobj<32, big_endian> void do_read_symbols(Read_symbols_data* sd); + // Process relocs for garbage collection. + void + do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); + private: // List of stub tables. typedef std::vector<Stub_table<big_endian>*> Stub_table_list; @@ -4235,6 +4239,44 @@ Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd) read_arm_attributes_section<big_endian>(this, sd); } +// Process relocations for garbage collection. The ARM target uses .ARM.exidx +// sections for unwinding. These sections are referenced implicitly by +// text sections linked in the section headers. If we ignore these implict +// references, the .ARM.exidx sections and any .ARM.extab sections they use +// will be garbage-collected incorrectly. Hence we override the same function +// in the base class to handle these implicit references. + +template<bool big_endian> +void +Arm_relobj<big_endian>::do_gc_process_relocs(Symbol_table* symtab, + Layout* layout, + Read_relocs_data* rd) +{ + // First, call base class method to process relocations in this object. + Sized_relobj<32, big_endian>::do_gc_process_relocs(symtab, layout, rd); + + unsigned int shnum = this->shnum(); + const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size; + const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), + shnum * shdr_size, + true, true); + + // Scan section headers for sections of type SHT_ARM_EXIDX. Add references + // to these from the linked text sections. + const unsigned char* ps = pshdrs + shdr_size; + for (unsigned int i = 1; i < shnum; ++i, ps += shdr_size) + { + elfcpp::Shdr<32, big_endian> shdr(ps); + if (shdr.get_sh_type() == elfcpp::SHT_ARM_EXIDX) + { + // Found an .ARM.exidx section, add it to the set of reachable + // sections from its linked text section. + unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_link()); + symtab->gc()->add_reference(this, text_shndx, this, i); + } + } +} + // Arm_dynobj methods. // Read the symbol information. @@ -5081,12 +5123,12 @@ Target_arm<big_endian>::do_finalize_sections( Symbol_table::PREDEFINED, exidx_section, 0, 0, elfcpp::STT_OBJECT, elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, - false, false); + false, true); symtab->define_in_output_data("__exidx_end", NULL, Symbol_table::PREDEFINED, exidx_section, 0, 0, elfcpp::STT_OBJECT, elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, - true, false); + true, true); // For the ARM target, we need to add a PT_ARM_EXIDX segment for // the .ARM.exidx section. |