diff options
Diffstat (limited to 'libdw/dwarf_nextcu.c')
| -rw-r--r-- | libdw/dwarf_nextcu.c | 131 |
1 files changed, 0 insertions, 131 deletions
diff --git a/libdw/dwarf_nextcu.c b/libdw/dwarf_nextcu.c deleted file mode 100644 index e674a66e..00000000 --- a/libdw/dwarf_nextcu.c +++ /dev/null @@ -1,131 +0,0 @@ -/* Advance to next CU header. - Copyright (C) 2002, 2003, 2004 Red Hat, Inc. - Written by Ulrich Drepper <drepper@redhat.com>, 2002. - - 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 <libdwP.h> - - -int -dwarf_nextcu (dwarf, off, next_off, header_sizep, abbrev_offsetp, - address_sizep, offset_sizep) - Dwarf *dwarf; - Dwarf_Off off; - Dwarf_Off *next_off; - size_t *header_sizep; - Dwarf_Off *abbrev_offsetp; - uint8_t *address_sizep; - uint8_t *offset_sizep; -{ - /* Maybe there has been an error before. */ - if (dwarf == NULL) - return -1; - - /* If we reached the end before don't do anything. */ - if (off == (Dwarf_Off) -1l - /* Make sure there is enough space in the .debug_info section - for at least the initial word. We cannot test the rest since - we don't know yet whether this is a 64-bit object or not. */ - || unlikely (off + 4 >= dwarf->sectiondata[IDX_debug_info]->d_size)) - { - *next_off = (Dwarf_Off) -1l; - return 1; - } - - /* This points into the .debug_info section to the beginning of the - CU entry. */ - char *bytes = (char *) dwarf->sectiondata[IDX_debug_info]->d_buf + off; - - /* The format of the CU header is described in dwarf2p1 7.5.1: - - 1. A 4-byte or 12-byte unsigned integer representing the length - of the .debug_info contribution for that compilation unit, not - including the length field itself. In the 32-bit DWARF format, - this is a 4-byte unsigned integer (which must be less than - 0xffffff00); in the 64-bit DWARF format, this consists of the - 4-byte value 0xffffffff followed by an 8-byte unsigned integer - that gives the actual length (see Section 7.4). - - 2. A 2-byte unsigned integer representing the version of the - DWARF information for that compilation unit. For DWARF Version - 2.1, the value in this field is 2. - - 3. A 4-byte or 8-byte unsigned offset into the .debug_abbrev - section. This offset associates the compilation unit with a - particular set of debugging information entry abbreviations. In - the 32-bit DWARF format, this is a 4-byte unsigned length; in - the 64-bit DWARF format, this is an 8-byte unsigned length (see - Section 7.4). - - 4. A 1-byte unsigned integer representing the size in bytes of - an address on the target architecture. If the system uses - segmented addressing, this value represents the size of the - offset portion of an address. */ - uint64_t length = read_4ubyte_unaligned_inc (dwarf, bytes); - size_t offset_size = 4; - if (length == 0xffffffffu) - offset_size = 8; - - /* Now we know how large the header is. Note the trick in the - computation. If the offset_size is 4 the '- 4' term undoes the - '2 *'. If offset_size is 8 this term computes the size of the - escape value plus the 8 byte offset. */ - if (unlikely (off + 2 * offset_size - 4 + sizeof (uint16_t) - + offset_size + sizeof (uint8_t) - >= dwarf->sectiondata[IDX_debug_info]->d_size)) - { - *next_off = -1; - return 1; - } - - if (length == 0xffffffffu) - /* This is a 64-bit DWARF format. */ - length = read_8ubyte_unaligned_inc (dwarf, bytes); - - /* Read the version stamp. Always a 16-bit value. - XXX Do we need the value? */ - read_2ubyte_unaligned_inc (dwarf, bytes); - - /* Get offset in .debug_abbrev. Note that the size of the entry - depends on whether this is a 32-bit or 64-bit DWARF definition. */ - uint64_t abbrev_offset; - if (offset_size == 4) - abbrev_offset = read_4ubyte_unaligned_inc (dwarf, bytes); - else - abbrev_offset = read_8ubyte_unaligned_inc (dwarf, bytes); - if (abbrev_offsetp != NULL) - *abbrev_offsetp = abbrev_offset; - - /* The address size. Always an 8-bit value. */ - uint8_t address_size = *bytes++; - if (address_sizep != NULL) - *address_sizep = address_size; - - /* Store the offset size. */ - if (offset_sizep != NULL) - *offset_sizep = offset_size; - - /* Store the header length. */ - if (header_sizep != NULL) - *header_sizep = (bytes - - ((char *) dwarf->sectiondata[IDX_debug_info]->d_buf - + off)); - - /* See above for an explanation of the trick in this formula. */ - *next_off = off + 2 * offset_size - 4 + length; - - return 0; -} |