Line data    Source code

       1             : /* Fetch live process registers from TID.
       2             :    Copyright (C) 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             : #ifdef __linux__
      34             : #if defined __arm__
      35             : # include <sys/types.h>
      36             : # include <sys/user.h>
      37             : # include <sys/ptrace.h>
      38             : #endif
      39             : 
      40             : #ifdef __aarch64__
      41             : # include <linux/uio.h>
      42             : # include <sys/user.h>
      43             : # include <sys/ptrace.h>
      44             : /* Deal with old glibc defining user_pt_regs instead of user_regs_struct.  */
      45             : # ifndef HAVE_SYS_USER_REGS
      46             : #  define user_regs_struct user_pt_regs
      47             : # endif
      48             : #endif
      49             : #endif
      50             : 
      51             : #define BACKEND arm_
      52             : #include "libebl_CPU.h"
      53             : 
      54             : bool
      55           0 : arm_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      56             :                           ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      57             :                                void *arg __attribute__ ((unused)))
      58             : {
      59             : #if !defined(__linux__) || (!defined __arm__ && !defined __aarch64__)
      60           0 :   return false;
      61             : #else   /* __arm__ || __aarch64__ */
      62             : #if defined __arm__
      63             :   struct user_regs user_regs;
      64             :   if (ptrace (PTRACE_GETREGS, tid, NULL, &user_regs) != 0)
      65             :     return false;
      66             : 
      67             :   Dwarf_Word dwarf_regs[16];
      68             :   /* R0..R12 SP LR PC */
      69             :   for (int i = 0; i < 16; i++)
      70             :     dwarf_regs[i] = user_regs.uregs[i];
      71             : 
      72             :   return setfunc (0, 16, dwarf_regs, arg);
      73             : #elif defined __aarch64__
      74             :   /* Compat mode: arm compatible code running on aarch64 */
      75             :   int i;
      76             :   struct user_regs_struct gregs;
      77             :   struct iovec iovec;
      78             :   iovec.iov_base = &gregs;
      79             :   iovec.iov_len = sizeof (gregs);
      80             :   if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
      81             :     return false;
      82             : 
      83             :   Dwarf_Word dwarf_regs[16];
      84             :   /* R0..R12 SP LR PC, encoded as 32 bit quantities */
      85             :   uint32_t *u32_ptr = (uint32_t *) &gregs.regs[0];
      86             :   for (i = 0; i < 16; i++)
      87             :     dwarf_regs[i] = u32_ptr[i];
      88             : 
      89             :   return setfunc (0, 16, dwarf_regs, arg);
      90             : #else
      91             : # error "source file error, it cannot happen"
      92             : #endif
      93             : #endif
      94             : }