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       1                 :             : /* Fetch live process registers from TID.
       2                 :             :    Copyright (C) 2026 Matt Turner
       3                 :             :    This file is part of elfutils.
       4                 :             : 
       5                 :             :    This file is free software; you can redistribute it and/or modify
       6                 :             :    it under the terms of either
       7                 :             : 
       8                 :             :      * the GNU Lesser General Public License as published by the Free
       9                 :             :        Software Foundation; either version 3 of the License, or (at
      10                 :             :        your option) any later version
      11                 :             : 
      12                 :             :    or
      13                 :             : 
      14                 :             :      * the GNU General Public License as published by the Free
      15                 :             :        Software Foundation; either version 2 of the License, or (at
      16                 :             :        your option) any later version
      17                 :             : 
      18                 :             :    or both in parallel, as here.
      19                 :             : 
      20                 :             :    elfutils is distributed in the hope that it will be useful, but
      21                 :             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :             :    General Public License for more details.
      24                 :             : 
      25                 :             :    You should have received copies of the GNU General Public License and
      26                 :             :    the GNU Lesser General Public License along with this program.  If
      27                 :             :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :             : 
      29                 :             : 
      30                 :             : #ifdef HAVE_CONFIG_H
      31                 :             : # include <config.h>
      32                 :             : #endif
      33                 :             : 
      34                 :             : #if defined __alpha__ && defined __linux__
      35                 :             : # include <errno.h>
      36                 :             : # include <stdint.h>
      37                 :             : # include <sys/ptrace.h>
      38                 :             : #endif
      39                 :             : 
      40                 :             : #define BACKEND alpha_
      41                 :             : #include "libebl_CPU.h"
      42                 :             : 
      43                 :             : bool
      44                 :           0 : alpha_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      45                 :             :                                  ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      46                 :             :                                  void *arg __attribute__ ((unused)))
      47                 :             : {
      48                 :             : #if !defined __alpha__ || !defined __linux__
      49                 :           0 :   return false;
      50                 :             : #else /* __alpha__ */
      51                 :             :   /* PTRACE_PEEKUSER takes a register number: 0-31 for the integer
      52                 :             :      registers, 32-62 for $f0-$f30, 63 for the FPCR and 64 for the PC.
      53                 :             :      The value is the return value, so check errno rather than for -1.  */
      54                 :             :   Dwarf_Word regs[65];
      55                 :             :   for (int i = 0; i < 65; i++)
      56                 :             :     {
      57                 :             :       /* $31 and $f31 always read as zero.  */
      58                 :             :       if (i == 31 || i == 63)
      59                 :             :         {
      60                 :             :           regs[i] = 0;
      61                 :             :           continue;
      62                 :             :         }
      63                 :             :       errno = 0;
      64                 :             :       regs[i] = ptrace (PTRACE_PEEKUSER, tid, (void *) (uintptr_t) i, NULL);
      65                 :             :       if (errno != 0)
      66                 :             :         return false;
      67                 :             :     }
      68                 :             : 
      69                 :             :   /* $0-$31 and $f0-$f31, then the PC.  */
      70                 :             :   return setfunc (0, 64, regs, arg) && setfunc (-1, 1, &regs[64], arg);
      71                 :             : #endif /* __alpha__ */
      72                 :             : }