| /* Return low program counter value associated with die. |
| Copyright (C) 2000, 2001, 2002 Red Hat, Inc. |
| This file is part of Red Hat elfutils. |
| Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| |
| 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. |
| |
| Red Hat 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. |
| |
| 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>. */ |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <dwarf.h> |
| |
| #include <libdwarfP.h> |
| |
| |
| int |
| dwarf_lowpc (die, return_lowpc, error) |
| Dwarf_Die die; |
| Dwarf_Addr *return_lowpc; |
| Dwarf_Error *error; |
| { |
| Dwarf_Debug dbg = die->cu->dbg; |
| Dwarf_Small *die_addr; |
| Dwarf_Word u128; |
| Dwarf_Abbrev abbrev; |
| Dwarf_Small *attrp; |
| |
| /* Address of the given die. */ |
| die_addr = die->addr; |
| |
| /* Get abbrev code. */ |
| get_uleb128 (u128, die_addr); |
| /* And get the abbreviation itself. */ |
| abbrev = __libdwarf_get_abbrev (dbg, die->cu, u128, error); |
| if (abbrev == NULL) |
| return DW_DLV_ERROR; |
| |
| /* This is where the attributes start. */ |
| attrp = abbrev->attrp; |
| |
| /* Search the name attribute. */ |
| while (1) |
| { |
| Dwarf_Word attr_name; |
| Dwarf_Word attr_form; |
| |
| /* Are we still in bounds? */ |
| if (unlikely (attrp |
| >= ((Dwarf_Small *) dbg->sections[IDX_debug_abbrev].addr |
| + dbg->sections[IDX_debug_abbrev].size))) |
| { |
| __libdwarf_error (dbg, error, DW_E_INVALID_DWARF); |
| return DW_DLV_ERROR; |
| } |
| |
| /* Get attribute name and form. |
| |
| XXX We don't check whether this reads beyond the end of the |
| section. */ |
| get_uleb128 (attr_name, attrp); |
| get_uleb128 (attr_form, attrp); |
| |
| /* We can stop if we found the attribute with value zero. */ |
| if (attr_name == 0 && attr_form == 0) |
| break; |
| |
| /* Is this the name attribute? */ |
| if (unlikely (attr_name == DW_AT_low_pc)) |
| { |
| if (unlikely (attr_form != DW_FORM_addr)) |
| { |
| __libdwarf_error (dbg, error, DW_E_INVALID_DWARF); |
| return DW_DLV_ERROR; |
| } |
| |
| if (die->cu->address_size == 4) |
| *return_lowpc = read_4ubyte_unaligned (dbg, die_addr); |
| else |
| *return_lowpc = read_8ubyte_unaligned (dbg, die_addr); |
| |
| return DW_DLV_OK; |
| } |
| |
| /* Skip over the rest of this attribute (if there is any). */ |
| if (attr_form != 0) |
| { |
| size_t len; |
| |
| if (unlikely (__libdwarf_form_val_len (dbg, die->cu, attr_form, |
| die_addr, &len, error) |
| != DW_DLV_OK)) |
| return DW_DLV_ERROR; |
| |
| die_addr += len; |
| } |
| } |
| |
| /* No such attribute present. */ |
| return DW_DLV_NO_ENTRY; |
| } |