Line data    Source code

       1             : /* Fetch live process registers from TID.
       2             :    Copyright (C) 2013, 2014 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             : #include "system.h"
      34             : #include <assert.h>
      35             : #if defined(__aarch64__) && defined(__linux__)
      36             : # include <linux/uio.h>
      37             : # include <sys/user.h>
      38             : # include <sys/ptrace.h>
      39             : /* Deal with old glibc defining user_pt_regs instead of user_regs_struct.  */
      40             : # ifndef HAVE_SYS_USER_REGS
      41             : #  define user_regs_struct user_pt_regs
      42             : #  define user_fpsimd_struct user_fpsimd_state
      43             : # endif
      44             : #endif
      45             : 
      46             : #define BACKEND aarch64_
      47             : #include "libebl_CPU.h"
      48             : 
      49             : bool
      50           0 : aarch64_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      51             :                           ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      52             :                                 void *arg __attribute__ ((unused)))
      53             : {
      54             : #if !defined(__aarch64__) || !defined(__linux__)
      55           0 :   return false;
      56             : #else /* __aarch64__ */
      57             : 
      58             :   /* General registers.  */
      59             :   struct user_regs_struct gregs;
      60             :   struct iovec iovec;
      61             :   iovec.iov_base = &gregs;
      62             :   iovec.iov_len = sizeof (gregs);
      63             :   if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
      64             :     return false;
      65             : 
      66             :   /* X0..X30 plus SP.  */
      67             :   if (! setfunc (0, 32, (Dwarf_Word *) &gregs.regs[0], arg))
      68             :     return false;
      69             : 
      70             :   /* PC.  */
      71             :   if (! setfunc (-1, 1, (Dwarf_Word *) &gregs.pc, arg))
      72             :     return false;
      73             : 
      74             :   /* ELR cannot be found.  */
      75             : 
      76             :   /* FP registers (only 64bits are used).  */
      77             :   struct user_fpsimd_struct fregs;
      78             :   iovec.iov_base = &fregs;
      79             :   iovec.iov_len = sizeof (fregs);
      80             :   if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec) != 0)
      81             :     return false;
      82             : 
      83             :   Dwarf_Word dwarf_fregs[32];
      84             :   for (int r = 0; r < 32; r++)
      85             :     dwarf_fregs[r] = fregs.vregs[r] & 0xFFFFFFFF;
      86             : 
      87             :   if (! setfunc (64, 32, dwarf_fregs, arg))
      88             :     return false;
      89             : 
      90             :   return true;
      91             : #endif /* __aarch64__ */
      92             : }