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       1                 :             : /* Populate process registers from a register sample.
       2                 :             :    Copyright (C) 2026 Red Hat Inc.
       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                 :             : #ifdef HAVE_CONFIG_H
      30                 :             : # include <config.h>
      31                 :             : #endif
      32                 :             : 
      33                 :             : #define BACKEND aarch64_
      34                 :             : #include "libebl_CPU.h"
      35                 :             : #include "libebl_PERF_FLAGS.h"
      36                 :             : 
      37                 :             : bool
      38                 :           0 : aarch64_sample_sp_pc (const Dwarf_Word *regs, uint32_t n_regs,
      39                 :             :                       const int *regs_mapping, size_t n_regs_mapping,
      40                 :             :                       Dwarf_Word *sp, Dwarf_Word *pc)
      41                 :             : {
      42                 :           0 :   return generic_sample_sp_pc (regs, n_regs, regs_mapping, n_regs_mapping,
      43                 :             :                                sp, 31 /* index of sp in dwarf_regs */,
      44                 :             :                                pc, 32 /* index of pc in dwarf_regs */);
      45                 :             : }
      46                 :             : 
      47                 :             : bool
      48                 :           0 : aarch64_set_initial_registers_sample (const Dwarf_Word *regs, uint32_t n_regs,
      49                 :             :                                       const int *regs_mapping, size_t n_regs_mapping,
      50                 :             :                                       ebl_tid_registers_t *setfunc,
      51                 :             :                                       void *arg)
      52                 :             : {
      53                 :             : #define N_GREGS 33
      54                 :           0 :   Dwarf_Word dwarf_regs[N_GREGS];
      55                 :           0 :   bool scratch_present = false;
      56                 :           0 :   size_t i;
      57         [ #  # ]:           0 :   for (i = 0; i < N_GREGS; i++)
      58                 :           0 :     dwarf_regs[i] = 0x0;
      59         [ #  # ]:           0 :   for (i = 0; i < n_regs; i++)
      60                 :             :     {
      61         [ #  # ]:           0 :       if (i >= n_regs_mapping)
      62                 :             :         break;
      63         [ #  # ]:           0 :       if (regs_mapping[i] < 0 || regs_mapping[i] >= N_GREGS)
      64                 :           0 :         continue;
      65         [ #  # ]:           0 :       if (regs_mapping[i] < 19)
      66                 :           0 :         scratch_present = true;
      67                 :           0 :       dwarf_regs[regs_mapping[i]] = regs[i];
      68                 :             :     }
      69                 :             : 
      70                 :             :   /* X0..X18 only if present.  */
      71   [ #  #  #  # ]:           0 :   if (scratch_present && ! setfunc (0, 19, &dwarf_regs[0], arg))
      72                 :             :     return false;
      73                 :             : 
      74                 :             :   /* X19..X29, X30(LR) plus SP.  */
      75         [ #  # ]:           0 :   if (! setfunc (19, 32 - 18, &dwarf_regs[19], arg))
      76                 :             :     return false;
      77                 :             : 
      78                 :             :   /* PC.  */
      79         [ #  # ]:           0 :   if (! setfunc (-1, 1, &dwarf_regs[32], arg))
      80                 :             :     return false;
      81                 :             : 
      82                 :             :   /* TODO: May need to obtain PAC mask since the unwinder needs to
      83                 :             :      strip it from LR/X30 to handle pointer authentication.  This
      84                 :             :      requires additional querying of the target process (e.g. a
      85                 :             :      one-time ptrace operation) in addition to perf_events data.
      86                 :             : 
      87                 :             :      Alternatively, stripping the top 16 bits from the pointer
      88                 :             :      may work as a desperation heuristic.  */
      89                 :             : 
      90                 :             :   /* Skip ELR, RA_SIGN_STATE  */
      91                 :             : 
      92                 :             :   /* XXX Skip FP registers.  */
      93                 :             :   return true;
      94                 :             : }