From e7c3341679431c5ecfc170a984d7196cdc175777 Mon Sep 17 00:00:00 2001 From: Nick Clifton Date: Wed, 3 Dec 2008 14:51:00 +0000 Subject: include/elf/ * common.h (STT_IFUNC): Define. elfcpp/ * elfcpp.h (enum STT): Add STT_IFUNC. bfd/ * syms.c (struct bfd_symbol): Add new flag BSF_INDIRECT_FUNCTION. Remove redundant flag BFD_FORT_COMM_DEFAULT_VALUE. Renumber flags to remove gaps. (bfd_print_symbol_vandf): Return 'i' for BSF_INDIRECT_FUNCTION. (bfd_decode_symclass): Likewise. * elf.c (swap_out_syms): Translate BSF_INDIRECT_FUNCTION into STT_IFUNC. (elf_find_function): Treat STT_IFUNC in the same way as STT_FUNC. (_bfd_elf_is_function_type): Likewise. * elf32-arm.c (arm_elf_find_function): Likewise. (elf32_arm_adjust_dynamic_symbol): Likewise. (elf32_arm_swap_symbol_in): Likewise. (elf32_arm_additional_program_headers): Likewise. * elf32-i386.c (is_indirect_symbol): New function. (elf_i386_check_relocs): Also generate dynamic relocs for relocations against STT_IFUNC symbols. (allocate_dynrelocs): Likewise. (elf_i386_relocate_section): Likewise. * elf64-x86-64.c (is_indirect_symbol): New function. (elf64_x86_64_check_relocs): Also generate dynamic relocs for relocations against STT_IFUNC symbols. (allocate_dynrelocs): Likewise. (elf64_x86_64_relocate_section): Likewise. * elfcode.h (elf_slurp_symbol_table): Translate STT_IFUNC into BSF_INDIRECT_FUNCTION. * elflink.c (_bfd_elf_adjust_dynamic_reloc_section): Add support for STT_IFUNC symbols. (get_ifunc_reloc_section_name): New function. (_bfd_elf_make_ifunc_reloc_section): New function. * elf-bfd.h (struct bfd_elf_section_data): Add indirect_relocs field. * bfd-in2.h: Regenerate. gas/ * config/obj-elf.c (obj_elf_type): Add support for STT_IFUNC type. * doc/as.texinfo: Document new feature. * NEWS: Mention new feature. gas/testsuite/ * gas/elf/type.s: Add test of STT_IFUNC symbol type. * gas/elf/type.e: Update expected disassembly. * gas/elf/elf.exp: Update grep of symbol types. ld/ * NEWS: Mention new feature. * pe-dll.c (process_def_file): Replace use of redundant BFD_FORT_COMM_DEFAULT_VALUE with 0. * scripttempl/elf.sc: Add .rel.ifunc.dyn and .rela.ifunc.dyn sections. ld/testsuite/ * ld-mips-elf/reloc-1-n32.d: Updated expected output for reloc descriptions. * ld-mips-elf/reloc-1-n64.d: Likewise. * ld-i386/ifunc.d: New test. * ld-i386/ifunc.s: Source file for the new test. * ld-i386/i386.exp: Run the new test. --- bfd/bfd-in2.h | 58 +++++++++++++++++++++++++++++++--------------------------- 1 file changed, 31 insertions(+), 27 deletions(-) (limited to 'bfd/bfd-in2.h') diff --git a/bfd/bfd-in2.h b/bfd/bfd-in2.h index 917b8bc..b1451c9 100644 --- a/bfd/bfd-in2.h +++ b/bfd/bfd-in2.h @@ -4445,100 +4445,104 @@ typedef struct bfd_symbol symvalue value; /* Attributes of a symbol. */ -#define BSF_NO_FLAGS 0x00 +#define BSF_NO_FLAGS 0x00 /* The symbol has local scope; <> in <>. The value is the offset into the section of the data. */ -#define BSF_LOCAL 0x01 +#define BSF_LOCAL (1 << 0) /* The symbol has global scope; initialized data in <>. The value is the offset into the section of the data. */ -#define BSF_GLOBAL 0x02 +#define BSF_GLOBAL (1 << 1) /* The symbol has global scope and is exported. The value is the offset into the section of the data. */ #define BSF_EXPORT BSF_GLOBAL /* No real difference. */ /* A normal C symbol would be one of: - <>, <>, <> or + <>, <>, <> or <>. */ /* The symbol is a debugging record. The value has an arbitrary meaning, unless BSF_DEBUGGING_RELOC is also set. */ -#define BSF_DEBUGGING 0x08 +#define BSF_DEBUGGING (1 << 2) /* The symbol denotes a function entry point. Used in ELF, perhaps others someday. */ -#define BSF_FUNCTION 0x10 - +#define BSF_FUNCTION (1 << 3) + + /* The symbol is an indirect code object. Unrelated to BSF_INDIRECT. + Relocations against a symbol with this flag have to evaluated at + run-time, where the function pointed to by this symbol is invoked + in order to determine the value to be used in the relocation. + BSF_FUNCTION must also be set for symbols with this flag. */ +#define BSF_INDIRECT_FUNCTION (1 << 4) + /* Used by the linker. */ -#define BSF_KEEP 0x20 -#define BSF_KEEP_G 0x40 +#define BSF_KEEP (1 << 5) +#define BSF_KEEP_G (1 << 6) /* A weak global symbol, overridable without warnings by a regular global symbol of the same name. */ -#define BSF_WEAK 0x80 +#define BSF_WEAK (1 << 7) /* This symbol was created to point to a section, e.g. ELF's STT_SECTION symbols. */ -#define BSF_SECTION_SYM 0x100 +#define BSF_SECTION_SYM (1 << 8) /* The symbol used to be a common symbol, but now it is allocated. */ -#define BSF_OLD_COMMON 0x200 - - /* The default value for common data. */ -#define BFD_FORT_COMM_DEFAULT_VALUE 0 +#define BSF_OLD_COMMON (1 << 9) /* In some files the type of a symbol sometimes alters its location in an output file - ie in coff a <> symbol which is also <> symbol appears where it was declared and not at the end of a section. This bit is set by the target BFD part to convey this information. */ -#define BSF_NOT_AT_END 0x400 +#define BSF_NOT_AT_END (1 << 10) /* Signal that the symbol is the label of constructor section. */ -#define BSF_CONSTRUCTOR 0x800 +#define BSF_CONSTRUCTOR (1 << 11) /* Signal that the symbol is a warning symbol. The name is a warning. The name of the next symbol is the one to warn about; if a reference is made to a symbol with the same name as the next symbol, a warning is issued by the linker. */ -#define BSF_WARNING 0x1000 +#define BSF_WARNING (1 << 12) /* Signal that the symbol is indirect. This symbol is an indirect pointer to the symbol with the same name as the next symbol. */ -#define BSF_INDIRECT 0x2000 +#define BSF_INDIRECT (1 << 13) /* BSF_FILE marks symbols that contain a file name. This is used for ELF STT_FILE symbols. */ -#define BSF_FILE 0x4000 +#define BSF_FILE (1 << 14) /* Symbol is from dynamic linking information. */ -#define BSF_DYNAMIC 0x8000 +#define BSF_DYNAMIC (1 << 15) /* The symbol denotes a data object. Used in ELF, and perhaps others someday. */ -#define BSF_OBJECT 0x10000 +#define BSF_OBJECT (1 << 16) /* This symbol is a debugging symbol. The value is the offset into the section of the data. BSF_DEBUGGING should be set as well. */ -#define BSF_DEBUGGING_RELOC 0x20000 +#define BSF_DEBUGGING_RELOC (1 << 17) /* This symbol is thread local. Used in ELF. */ -#define BSF_THREAD_LOCAL 0x40000 +#define BSF_THREAD_LOCAL (1 << 18) /* This symbol represents a complex relocation expression, with the expression tree serialized in the symbol name. */ -#define BSF_RELC 0x80000 +#define BSF_RELC (1 << 19) /* This symbol represents a signed complex relocation expression, with the expression tree serialized in the symbol name. */ -#define BSF_SRELC 0x100000 +#define BSF_SRELC (1 << 20) /* This symbol was created by bfd_get_synthetic_symtab. */ -#define BSF_SYNTHETIC 0x200000 +#define BSF_SYNTHETIC (1 << 21) flagword flags; -- cgit v1.1