diff options
Diffstat (limited to 'src/libdwfl/dwfl_module_getsym.c')
| -rw-r--r-- | src/libdwfl/dwfl_module_getsym.c | 190 |
1 files changed, 139 insertions, 51 deletions
diff --git a/src/libdwfl/dwfl_module_getsym.c b/src/libdwfl/dwfl_module_getsym.c index 6bc063bb..42d2b679 100644 --- a/src/libdwfl/dwfl_module_getsym.c +++ b/src/libdwfl/dwfl_module_getsym.c @@ -1,57 +1,38 @@ /* Find debugging and symbol information for a module in libdwfl. - Copyright (C) 2006-2010 Red Hat, Inc. - This file is part of Red Hat elfutils. + Copyright (C) 2006-2014 Red Hat, Inc. + This file is part of elfutils. - Red Hat elfutils is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by the - Free Software Foundation; version 2 of the License. + This file is free software; you can redistribute it and/or modify + it under the terms of either - Red Hat elfutils is distributed in the hope that it will be useful, but + * the GNU Lesser General Public License as published by the Free + Software Foundation; either version 3 of the License, or (at + your option) any later version + + or + + * the GNU General Public License as published by the Free + Software Foundation; either version 2 of the License, or (at + your option) any later version + + or both in parallel, as here. + + elfutils is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - You should have received a copy of the GNU General Public License along - with Red Hat elfutils; if not, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. - - In addition, as a special exception, Red Hat, Inc. gives You the - additional right to link the code of Red Hat elfutils with code licensed - under any Open Source Initiative certified open source license - (http://www.opensource.org/licenses/index.php) which requires the - distribution of source code with any binary distribution and to - distribute linked combinations of the two. Non-GPL Code permitted under - this exception must only link to the code of Red Hat elfutils through - those well defined interfaces identified in the file named EXCEPTION - found in the source code files (the "Approved Interfaces"). The files - of Non-GPL Code may instantiate templates or use macros or inline - functions from the Approved Interfaces without causing the resulting - work to be covered by the GNU General Public License. Only Red Hat, - Inc. may make changes or additions to the list of Approved Interfaces. - Red Hat's grant of this exception is conditioned upon your not adding - any new exceptions. If you wish to add a new Approved Interface or - exception, please contact Red Hat. You must obey the GNU General Public - License in all respects for all of the Red Hat elfutils code and other - code used in conjunction with Red Hat elfutils except the Non-GPL Code - covered by this exception. If you modify this file, you may extend this - exception to your version of the file, but you are not obligated to do - so. If you do not wish to provide this exception without modification, - you must delete this exception statement from your version and license - this file solely under the GPL without exception. - - Red Hat elfutils is an included package of the Open Invention Network. - An included package of the Open Invention Network is a package for which - Open Invention Network licensees cross-license their patents. No patent - license is granted, either expressly or impliedly, by designation as an - included package. Should you wish to participate in the Open Invention - Network licensing program, please visit www.openinventionnetwork.com - <http://www.openinventionnetwork.com>. */ + You should have received copies of the GNU General Public License and + the GNU Lesser General Public License along with this program. If + not, see <http://www.gnu.org/licenses/>. */ #include "libdwflP.h" const char * -dwfl_module_getsym (Dwfl_Module *mod, int ndx, - GElf_Sym *sym, GElf_Word *shndxp) +internal_function +__libdwfl_getsym (Dwfl_Module *mod, int ndx, GElf_Sym *sym, GElf_Addr *addr, + GElf_Word *shndxp, Elf **elfp, Dwarf_Addr *biasp, + bool *resolved, bool adjust_st_value) { if (unlikely (mod == NULL)) return NULL; @@ -63,8 +44,56 @@ dwfl_module_getsym (Dwfl_Module *mod, int ndx, return NULL; } + /* All local symbols should come before all global symbols. If we + have an auxiliary table make sure all the main locals come first, + then all aux locals, then all main globals and finally all aux globals. + And skip the auxiliary table zero undefined entry. */ GElf_Word shndx; - sym = gelf_getsymshndx (mod->symdata, mod->symxndxdata, ndx, sym, &shndx); + int tndx = ndx; + int skip_aux_zero = (mod->syments > 0 && mod->aux_syments > 0) ? 1 : 0; + Elf *elf; + Elf_Data *symdata; + Elf_Data *symxndxdata; + Elf_Data *symstrdata; + if (mod->aux_symdata == NULL + || ndx < mod->first_global) + { + /* main symbol table (locals). */ + tndx = ndx; + elf = mod->symfile->elf; + symdata = mod->symdata; + symxndxdata = mod->symxndxdata; + symstrdata = mod->symstrdata; + } + else if (ndx < mod->first_global + mod->aux_first_global - skip_aux_zero) + { + /* aux symbol table (locals). */ + tndx = ndx - mod->first_global + skip_aux_zero; + elf = mod->aux_sym.elf; + symdata = mod->aux_symdata; + symxndxdata = mod->aux_symxndxdata; + symstrdata = mod->aux_symstrdata; + } + else if ((size_t) ndx < mod->syments + mod->aux_first_global - skip_aux_zero) + { + /* main symbol table (globals). */ + tndx = ndx - mod->aux_first_global + skip_aux_zero; + elf = mod->symfile->elf; + symdata = mod->symdata; + symxndxdata = mod->symxndxdata; + symstrdata = mod->symstrdata; + } + else + { + /* aux symbol table (globals). */ + tndx = ndx - mod->syments + skip_aux_zero; + elf = mod->aux_sym.elf; + symdata = mod->aux_symdata; + symxndxdata = mod->aux_symxndxdata; + symstrdata = mod->aux_symstrdata; + } + sym = gelf_getsymshndx (symdata, symxndxdata, tndx, sym, &shndx); + if (unlikely (sym == NULL)) { __libdwfl_seterrno (DWFL_E_LIBELF); @@ -81,11 +110,37 @@ dwfl_module_getsym (Dwfl_Module *mod, int ndx, || (sym->st_shndx < SHN_LORESERVE && sym->st_shndx != SHN_UNDEF))) { GElf_Shdr shdr_mem; - GElf_Shdr *shdr = gelf_getshdr (elf_getscn (mod->symfile->elf, shndx), - &shdr_mem); + GElf_Shdr *shdr = gelf_getshdr (elf_getscn (elf, shndx), &shdr_mem); alloc = unlikely (shdr == NULL) || (shdr->sh_flags & SHF_ALLOC); } + /* In case of an value in an allocated section the main Elf Ebl + might know where the real value is (e.g. for function + descriptors). */ + + char *ident; + GElf_Addr st_value = sym->st_value & ebl_func_addr_mask (mod->ebl); + *resolved = false; + if (! adjust_st_value && mod->e_type != ET_REL && alloc + && (GELF_ST_TYPE (sym->st_info) == STT_FUNC + || (GELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC + && (ident = elf_getident (elf, NULL)) != NULL + && ident[EI_OSABI] == ELFOSABI_LINUX))) + { + if (likely (__libdwfl_module_getebl (mod) == DWFL_E_NOERROR)) + { + if (elf != mod->main.elf) + { + st_value = dwfl_adjusted_st_value (mod, elf, st_value); + st_value = dwfl_deadjust_st_value (mod, mod->main.elf, st_value); + } + + *resolved = ebl_resolve_sym_value (mod->ebl, &st_value); + if (! *resolved) + st_value = sym->st_value; + } + } + if (shndxp != NULL) /* Yield -1 in case of a non-SHF_ALLOC section. */ *shndxp = alloc ? shndx : (GElf_Word) -1; @@ -103,9 +158,9 @@ dwfl_module_getsym (Dwfl_Module *mod, int ndx, /* In an ET_REL file, the symbol table values are relative to the section, not to the module's load base. */ size_t symshstrndx = SHN_UNDEF; - Dwfl_Error result = __libdwfl_relocate_value (mod, mod->symfile->elf, + Dwfl_Error result = __libdwfl_relocate_value (mod, elf, &symshstrndx, - shndx, &sym->st_value); + shndx, &st_value); if (unlikely (result != DWFL_E_NOERROR)) { __libdwfl_seterrno (result); @@ -114,15 +169,48 @@ dwfl_module_getsym (Dwfl_Module *mod, int ndx, } else if (alloc) /* Apply the bias to the symbol value. */ - sym->st_value = dwfl_adjusted_st_value (mod, sym->st_value); + st_value = dwfl_adjusted_st_value (mod, + *resolved ? mod->main.elf : elf, + st_value); break; } - if (unlikely (sym->st_name >= mod->symstrdata->d_size)) + if (adjust_st_value) + sym->st_value = st_value; + + if (addr != NULL) + *addr = st_value; + + if (unlikely (sym->st_name >= symstrdata->d_size)) { __libdwfl_seterrno (DWFL_E_BADSTROFF); return NULL; } - return (const char *) mod->symstrdata->d_buf + sym->st_name; + if (elfp) + *elfp = elf; + if (biasp) + *biasp = dwfl_adjusted_st_value (mod, elf, 0); + return (const char *) symstrdata->d_buf + sym->st_name; +} + +const char * +dwfl_module_getsym_info (Dwfl_Module *mod, int ndx, + GElf_Sym *sym, GElf_Addr *addr, + GElf_Word *shndxp, + Elf **elfp, Dwarf_Addr *bias) +{ + bool resolved; + return __libdwfl_getsym (mod, ndx, sym, addr, shndxp, elfp, bias, + &resolved, false); +} +INTDEF (dwfl_module_getsym_info) + +const char * +dwfl_module_getsym (Dwfl_Module *mod, int ndx, + GElf_Sym *sym, GElf_Word *shndxp) +{ + bool resolved; + return __libdwfl_getsym (mod, ndx, sym, NULL, shndxp, NULL, NULL, + &resolved, true); } INTDEF (dwfl_module_getsym) |