diff options
Diffstat (limited to 'src/libdw/cfi.c')
| -rw-r--r-- | src/libdw/cfi.c | 136 |
1 files changed, 67 insertions, 69 deletions
diff --git a/src/libdw/cfi.c b/src/libdw/cfi.c index aeb48e69..632e91d3 100644 --- a/src/libdw/cfi.c +++ b/src/libdw/cfi.c @@ -1,51 +1,30 @@ /* CFI program execution. - Copyright (C) 2009-2010 Red Hat, Inc. - This file is part of Red Hat elfutils. + Copyright (C) 2009-2010, 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/>. */ #ifdef HAVE_CONFIG_H # include <config.h> @@ -56,6 +35,7 @@ #include "cfi.h" #include "memory-access.h" #include "encoded-value.h" +#include "system.h" #include <assert.h> #include <stdlib.h> #include <string.h> @@ -110,6 +90,9 @@ execute_cfi (Dwarf_CFI *cache, } else { + eu_static_assert (reg_unspecified == 0); + memset (bigger->regs + bigger->nregs, 0, + (reg + 1 - bigger->nregs) * sizeof bigger->regs[0]); bigger->nregs = reg + 1; fs = bigger; } @@ -149,12 +132,15 @@ execute_cfi (Dwarf_CFI *cache, break; case DW_CFA_advance_loc2: + cfi_assert (program + 2 <= end); operand = read_2ubyte_unaligned_inc (cache, program); goto advance_loc; case DW_CFA_advance_loc4: + cfi_assert (program + 4 <= end); operand = read_4ubyte_unaligned_inc (cache, program); goto advance_loc; case DW_CFA_MIPS_advance_loc8: + cfi_assert (program + 8 <= end); operand = read_8ubyte_unaligned_inc (cache, program); goto advance_loc; @@ -170,8 +156,9 @@ execute_cfi (Dwarf_CFI *cache, switch block for the row-copying (LOC-moving) cases above. */ case DW_CFA_def_cfa: - get_uleb128 (operand, program); - get_uleb128 (offset, program); + get_uleb128 (operand, program, end); + cfi_assert (program < end); + get_uleb128 (offset, program, end); def_cfa: fs->cfa_rule = cfa_offset; fs->cfa_val_reg = operand; @@ -182,32 +169,33 @@ execute_cfi (Dwarf_CFI *cache, continue; case DW_CFA_def_cfa_register: - get_uleb128 (regno, program); + get_uleb128 (regno, program, end); require_cfa_offset (); fs->cfa_val_reg = regno; continue; case DW_CFA_def_cfa_sf: - get_uleb128 (operand, program); - get_sleb128 (sf_offset, program); + get_uleb128 (operand, program, end); + cfi_assert (program < end); + get_sleb128 (sf_offset, program, end); offset = sf_offset * cie->data_alignment_factor; goto def_cfa; case DW_CFA_def_cfa_offset: - get_uleb128 (offset, program); + get_uleb128 (offset, program, end); def_cfa_offset: require_cfa_offset (); fs->cfa_val_offset = offset; continue; case DW_CFA_def_cfa_offset_sf: - get_sleb128 (sf_offset, program); + get_sleb128 (sf_offset, program, end); offset = sf_offset * cie->data_alignment_factor; goto def_cfa_offset; case DW_CFA_def_cfa_expression: /* DW_FORM_block is a ULEB128 length followed by that many bytes. */ - get_uleb128 (operand, program); + get_uleb128 (operand, program, end); cfi_assert (operand <= (Dwarf_Word) (end - program)); fs->cfa_rule = cfa_expr; fs->cfa_data.expr.data = (unsigned char *) program; @@ -216,80 +204,90 @@ execute_cfi (Dwarf_CFI *cache, continue; case DW_CFA_undefined: - get_uleb128 (regno, program); + get_uleb128 (regno, program, end); register_rule (regno, undefined, 0); continue; case DW_CFA_same_value: - get_uleb128 (regno, program); + get_uleb128 (regno, program, end); register_rule (regno, same_value, 0); continue; case DW_CFA_offset_extended: - get_uleb128 (operand, program); + get_uleb128 (operand, program, end); + cfi_assert (program < end); case DW_CFA_offset + 0 ... DW_CFA_offset + CFI_PRIMARY_MAX: - get_uleb128 (offset, program); + get_uleb128 (offset, program, end); offset *= cie->data_alignment_factor; offset_extended: register_rule (operand, offset, offset); continue; case DW_CFA_offset_extended_sf: - get_uleb128 (operand, program); - get_sleb128 (sf_offset, program); + get_uleb128 (operand, program, end); + get_sleb128 (sf_offset, program, end); offset_extended_sf: offset = sf_offset * cie->data_alignment_factor; goto offset_extended; case DW_CFA_GNU_negative_offset_extended: /* GNU extension obsoleted by DW_CFA_offset_extended_sf. */ - get_uleb128 (operand, program); - get_uleb128 (offset, program); + get_uleb128 (operand, program, end); + cfi_assert (program < end); + get_uleb128 (offset, program, end); sf_offset = -offset; goto offset_extended_sf; case DW_CFA_val_offset: - get_uleb128 (operand, program); - get_uleb128 (offset, program); + get_uleb128 (operand, program, end); + cfi_assert (program < end); + get_uleb128 (offset, program, end); offset *= cie->data_alignment_factor; val_offset: register_rule (operand, val_offset, offset); continue; case DW_CFA_val_offset_sf: - get_uleb128 (operand, program); - get_sleb128 (sf_offset, program); + get_uleb128 (operand, program, end); + cfi_assert (program < end); + get_sleb128 (sf_offset, program, end); offset = sf_offset * cie->data_alignment_factor; goto val_offset; case DW_CFA_register: - get_uleb128 (regno, program); - get_uleb128 (operand, program); + get_uleb128 (regno, program, end); + cfi_assert (program < end); + get_uleb128 (operand, program, end); register_rule (regno, register, operand); continue; case DW_CFA_expression: - get_uleb128 (regno, program); + /* Expression rule relies on section data, abi_cfi cannot use it. */ + assert (! abi_cfi); + get_uleb128 (regno, program, end); offset = program - (const uint8_t *) cache->data->d.d_buf; /* DW_FORM_block is a ULEB128 length followed by that many bytes. */ - get_uleb128 (operand, program); + cfi_assert (program < end); + get_uleb128 (operand, program, end); cfi_assert (operand <= (Dwarf_Word) (end - program)); program += operand; register_rule (regno, expression, offset); continue; case DW_CFA_val_expression: - get_uleb128 (regno, program); + /* Expression rule relies on section data, abi_cfi cannot use it. */ + assert (! abi_cfi); + get_uleb128 (regno, program, end); /* DW_FORM_block is a ULEB128 length followed by that many bytes. */ offset = program - (const uint8_t *) cache->data->d.d_buf; - get_uleb128 (operand, program); + get_uleb128 (operand, program, end); cfi_assert (operand <= (Dwarf_Word) (end - program)); program += operand; register_rule (regno, val_expression, offset); continue; case DW_CFA_restore_extended: - get_uleb128 (operand, program); + get_uleb128 (operand, program, end); case DW_CFA_restore + 0 ... DW_CFA_restore + CFI_PRIMARY_MAX: if (unlikely (abi_cfi) && likely (opcode == DW_CFA_restore)) @@ -360,7 +358,7 @@ execute_cfi (Dwarf_CFI *cache, case DW_CFA_GNU_args_size: /* XXX is this useful for anything? */ - get_uleb128 (operand, program); + get_uleb128 (operand, program, end); continue; default: |