Line data    Source code

       1              : /* Fetch live process registers from TID.
       2              :    Copyright (C) 2023 OpenAnolis community LoongArch SIG.
       3              :    Copyright (C) 2023 Loongson Technology Corporation Limted.
       4              :    This file is part of elfutils.
       5              : 
       6              :    This file is free software; you can redistribute it and/or modify
       7              :    it under the terms of either
       8              : 
       9              :      * the GNU Lesser General Public License as published by the Free
      10              :        Software Foundation; either version 3 of the License, or (at
      11              :        your option) any later version
      12              : 
      13              :    or
      14              : 
      15              :      * the GNU General Public License as published by the Free
      16              :        Software Foundation; either version 2 of the License, or (at
      17              :        your option) any later version
      18              : 
      19              :    or both in parallel, as here.
      20              : 
      21              :    elfutils is distributed in the hope that it will be useful, but
      22              :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23              :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24              :    General Public License for more details.
      25              : 
      26              :    You should have received copies of the GNU General Public License and
      27              :    the GNU Lesser General Public License along with this program.  If
      28              :    not, see <http://www.gnu.org/licenses/>.  */
      29              : 
      30              : #ifdef HAVE_CONFIG_H
      31              : # include <config.h>
      32              : #endif
      33              : 
      34              : #include "system.h"
      35              : #include <assert.h>
      36              : #if defined __loongarch__ && defined __linux__
      37              : # include <sys/uio.h>
      38              : # include <sys/procfs.h>
      39              : # include <sys/ptrace.h>
      40              : #endif
      41              : 
      42              : #define BACKEND loongarch_
      43              : #include "libebl_CPU.h"
      44              : 
      45              : bool
      46            0 : loongarch_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      47              :                                  ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      48              :                                  void *arg __attribute__ ((unused)))
      49              : {
      50              : #if !defined __loongarch__ || !defined __linux__
      51            0 :   return false;
      52              : #else /* __loongarch__ */
      53              : 
      54              :   /* General registers.  */
      55              :   struct user_regs_struct gregs;
      56              :   struct iovec iovec;
      57              :   iovec.iov_base = &gregs;
      58              :   iovec.iov_len = sizeof (gregs);
      59              :   if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
      60              :     return false;
      61              : 
      62              :   /* $r0 is constant 0.  */
      63              :   Dwarf_Word zero = 0;
      64              :   if (! setfunc (0, 1, &zero, arg))
      65              :     return false;
      66              : 
      67              :   /* $r1-$r31.  */
      68              :   if (! setfunc (1, 32, (Dwarf_Word *) &gregs.regs[1], arg))
      69              :     return false;
      70              : 
      71              :   /* PC.  */
      72              :   if (! setfunc (-1, 1, (Dwarf_Word *) &gregs.csr_era, arg))
      73              :     return false;
      74              : 
      75              :   /* Floating-point registers (only 64bits are used).  */
      76              :   struct user_fp_struct fregs;
      77              :   iovec.iov_base = &fregs;
      78              :   iovec.iov_len = sizeof (fregs);
      79              :   if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec) != 0)
      80              :     return false;
      81              : 
      82              :   /* $f0-$f31 */
      83              :   if (! setfunc (32, 32, (Dwarf_Word *) &fregs.fpr[0], arg))
      84              :     return false;
      85              : 
      86              :   return true;
      87              : #endif /* __loongarch__ */
      88              : }