/* Common pieces for handling registers in a linux perf_events sample.

   Copyright (C) 2025 Red Hat, Inc.

   This file is part of elfutils.

   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/>.  */

static Dwarf_Word

perf_sample_find_reg (const Dwarf_Word *regs, uint32_t n_regs,

          uint64_t regs_mask,

          int target)

{

  int j, k; uint64_t bit;

  for (j = 0, k = 0, bit = 1; k < PERF_REG_X86_64_MAX; k++, bit <<= 1)

    {

      if (bit & regs_mask) {

  if (n_regs <= (uint32_t) j)

    return 0; /* regs_mask count doesn't match n_regs */

  if (k == target)

    return regs[j];

  if (k > target)

    return 0; /* regs_mask doesn't include desired reg */

  j++;

      }

    }

  return 0;

}

Unexecuted instantiation: i386_initreg_sample.c:perf_sample_find_reg

Unexecuted instantiation: x86_64_initreg_sample.c:perf_sample_find_reg