| /* Return low program counter value associated with die. |
| Copyright (C) 2000, 2001, 2002 Red Hat, Inc. |
| Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| |
| This program is Open Source software; you can redistribute it and/or |
| modify it under the terms of the Open Software License version 1.0 as |
| published by the Open Source Initiative. |
| |
| You should have received a copy of the Open Software License along |
| with this program; if not, you may obtain a copy of the Open Software |
| License version 1.0 from http://www.opensource.org/licenses/osl.php or |
| by writing the Open Source Initiative c/o Lawrence Rosen, Esq., |
| 3001 King Ranch Road, Ukiah, CA 95482. */ |
| |
| #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; |
| } |