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/* Get register location expression for frame.
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Copyright (C) 2009-2010, 2014 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "cfi.h"
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#include <dwarf.h>
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int
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dwarf_frame_register (Dwarf_Frame *fs, int regno, Dwarf_Op *ops_mem,
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Dwarf_Op **ops, size_t *nops)
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{
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/* Maybe there was a previous error. */
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if (fs == NULL)
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return -1;
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if (unlikely (regno < 0))
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{
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__libdw_seterrno (DWARF_E_INVALID_ACCESS);
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return -1;
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}
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*ops = ops_mem;
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*nops = 0;
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if (unlikely ((size_t) regno >= fs->nregs))
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goto default_rule;
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const struct dwarf_frame_register *reg = &fs->regs[regno];
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switch (reg->rule)
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{
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case reg_unspecified:
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default_rule:
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/* Use the default rule for registers not yet mentioned in CFI. */
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if (fs->cache->default_same_value)
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goto same_value;
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FALLTHROUGH;
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case reg_undefined:
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/* The value is known to be unavailable. */
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break;
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case reg_same_value:
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same_value:
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/* The location is not known here, but the caller might know it. */
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*ops = NULL;
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break;
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case reg_offset:
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case reg_val_offset:
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ops_mem[(*nops)++] = (Dwarf_Op) { .atom = DW_OP_call_frame_cfa };
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if (reg->value != 0)
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ops_mem[(*nops)++] = (Dwarf_Op) { .atom = DW_OP_plus_uconst,
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.number = reg->value };
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if (reg->rule == reg_val_offset)
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/* A value, not a location. */
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ops_mem[(*nops)++] = (Dwarf_Op) { .atom = DW_OP_stack_value };
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*ops = ops_mem;
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break;
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case reg_register:
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ops_mem[(*nops)++] = (Dwarf_Op) { .atom = DW_OP_regx,
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.number = reg->value };
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break;
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case reg_val_expression:
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case reg_expression:
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{
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unsigned int address_size = (fs->cache->e_ident[EI_CLASS] == ELFCLASS32
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? 4 : 8);
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Dwarf_Block block;
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const uint8_t *p = fs->cache->data->d.d_buf + reg->value;
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const uint8_t *end = (fs->cache->data->d.d_buf
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+ fs->cache->data->d.d_size);
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get_uleb128 (block.length, p, end);
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block.data = (void *) p;
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/* Parse the expression into internal form. */
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if (__libdw_intern_expression (NULL,
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fs->cache->other_byte_order,
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address_size, 4,
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&fs->cache->expr_tree, &block,
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true, reg->rule == reg_val_expression,
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ops, nops, IDX_debug_frame) < 0)
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return -1;
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break;
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}
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}
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return 0;
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}
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