Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libdw/dwarf_formudata.c b/libdw/dwarf_formudata.c
new file mode 100644
index 0000000..e41981a
--- /dev/null
+++ b/libdw/dwarf_formudata.c
@@ -0,0 +1,231 @@
+/* Return unsigned constant represented by attribute.
+ Copyright (C) 2003-2012, 2014 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * 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 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>
+#endif
+
+#include <dwarf.h>
+#include "libdwP.h"
+
+internal_function unsigned char *
+__libdw_formptr (Dwarf_Attribute *attr, int sec_index,
+ int err_nodata, unsigned char **endpp,
+ Dwarf_Off *offsetp)
+{
+ if (attr == NULL)
+ return NULL;
+
+ const Elf_Data *d = attr->cu->dbg->sectiondata[sec_index];
+ if (unlikely (d == NULL))
+ {
+ __libdw_seterrno (err_nodata);
+ return NULL;
+ }
+
+ Dwarf_Word offset;
+ if (attr->form == DW_FORM_sec_offset)
+ {
+ if (__libdw_read_offset (attr->cu->dbg, attr->cu->dbg,
+ cu_sec_idx (attr->cu), attr->valp,
+ attr->cu->offset_size, &offset, sec_index, 0))
+ return NULL;
+ }
+ else if (attr->cu->version > 3)
+ goto invalid;
+ else
+ switch (attr->form)
+ {
+ case DW_FORM_data4:
+ case DW_FORM_data8:
+ if (__libdw_read_offset (attr->cu->dbg, attr->cu->dbg,
+ cu_sec_idx (attr->cu),
+ attr->valp,
+ attr->form == DW_FORM_data4 ? 4 : 8,
+ &offset, sec_index, 0))
+ return NULL;
+ break;
+
+ default:
+ if (INTUSE(dwarf_formudata) (attr, &offset))
+ return NULL;
+ };
+
+ unsigned char *readp = d->d_buf + offset;
+ unsigned char *endp = d->d_buf + d->d_size;
+ if (unlikely (readp >= endp))
+ {
+ invalid:
+ __libdw_seterrno (DWARF_E_INVALID_DWARF);
+ return NULL;
+ }
+
+ if (endpp != NULL)
+ *endpp = endp;
+ if (offsetp != NULL)
+ *offsetp = offset;
+ return readp;
+}
+
+int
+dwarf_formudata (Dwarf_Attribute *attr, Dwarf_Word *return_uval)
+{
+ if (attr == NULL)
+ return -1;
+
+ const unsigned char *datap = attr->valp;
+ const unsigned char *endp = attr->cu->endp;
+
+ switch (attr->form)
+ {
+ case DW_FORM_data1:
+ if (datap + 1 > endp)
+ {
+ invalid:
+ __libdw_seterrno (DWARF_E_INVALID_DWARF);
+ return -1;
+ }
+ *return_uval = *attr->valp;
+ break;
+
+ case DW_FORM_data2:
+ if (datap + 2 > endp)
+ goto invalid;
+ *return_uval = read_2ubyte_unaligned (attr->cu->dbg, attr->valp);
+ break;
+
+ case DW_FORM_data4:
+ case DW_FORM_data8:
+ case DW_FORM_sec_offset:
+ /* Before DWARF4 data4 and data8 are pure constants unless the
+ attribute also allows offsets (*ptr classes), since DWARF4
+ they are always just constants (start_scope is special though,
+ since it only could express a rangelist since DWARF4). */
+ if (attr->form == DW_FORM_sec_offset
+ || (attr->cu->version < 4 && attr->code != DW_AT_start_scope))
+ {
+ switch (attr->code)
+ {
+ case DW_AT_data_member_location:
+ case DW_AT_frame_base:
+ case DW_AT_location:
+ case DW_AT_return_addr:
+ case DW_AT_segment:
+ case DW_AT_static_link:
+ case DW_AT_string_length:
+ case DW_AT_use_location:
+ case DW_AT_vtable_elem_location:
+ /* loclistptr */
+ if (__libdw_formptr (attr, IDX_debug_loc,
+ DWARF_E_NO_LOCLIST, NULL,
+ return_uval) == NULL)
+ return -1;
+ break;
+
+ case DW_AT_macro_info:
+ /* macptr into .debug_macinfo */
+ if (__libdw_formptr (attr, IDX_debug_macinfo,
+ DWARF_E_NO_ENTRY, NULL,
+ return_uval) == NULL)
+ return -1;
+ break;
+
+ case DW_AT_GNU_macros:
+ /* macptr into .debug_macro */
+ if (__libdw_formptr (attr, IDX_debug_macro,
+ DWARF_E_NO_ENTRY, NULL,
+ return_uval) == NULL)
+ return -1;
+ break;
+
+ case DW_AT_ranges:
+ case DW_AT_start_scope:
+ /* rangelistptr */
+ if (__libdw_formptr (attr, IDX_debug_ranges,
+ DWARF_E_NO_DEBUG_RANGES, NULL,
+ return_uval) == NULL)
+ return -1;
+ break;
+
+ case DW_AT_stmt_list:
+ /* lineptr */
+ if (__libdw_formptr (attr, IDX_debug_line,
+ DWARF_E_NO_DEBUG_LINE, NULL,
+ return_uval) == NULL)
+ return -1;
+ break;
+
+ default:
+ /* sec_offset can only be used by one of the above attrs. */
+ if (attr->form == DW_FORM_sec_offset)
+ {
+ __libdw_seterrno (DWARF_E_INVALID_DWARF);
+ return -1;
+ }
+
+ /* Not one of the special attributes, just a constant. */
+ if (__libdw_read_address (attr->cu->dbg, cu_sec_idx (attr->cu),
+ attr->valp,
+ attr->form == DW_FORM_data4 ? 4 : 8,
+ return_uval))
+ return -1;
+ break;
+ }
+ }
+ else
+ {
+ /* We are dealing with a constant data4 or data8. */
+ if (__libdw_read_address (attr->cu->dbg, cu_sec_idx (attr->cu),
+ attr->valp,
+ attr->form == DW_FORM_data4 ? 4 : 8,
+ return_uval))
+ return -1;
+ }
+ break;
+
+ case DW_FORM_sdata:
+ if (datap + 1 > endp)
+ goto invalid;
+ get_sleb128 (*return_uval, datap, endp);
+ break;
+
+ case DW_FORM_udata:
+ if (datap + 1 > endp)
+ goto invalid;
+ get_uleb128 (*return_uval, datap, endp);
+ break;
+
+ default:
+ __libdw_seterrno (DWARF_E_NO_CONSTANT);
+ return -1;
+ }
+
+ return 0;
+}
+INTDEF(dwarf_formudata)