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              : # include <asm/ptrace.h>
      40              : /* Deal with old glibc defining user_pt_regs instead of user_regs_struct.  */
      41              : # ifndef HAVE_SYS_USER_REGS
      42              : #  define user_regs_struct user_pt_regs
      43              : #  define user_fpsimd_struct user_fpsimd_state
      44              : # endif
      45              : #endif
      46              : 
      47              : #define BACKEND aarch64_
      48              : #include "libebl_CPU.h"
      49              : 
      50              : /*
      51              :  * pointer authentication masks (NT_ARM_PAC_MASK)
      52              :  *
      53              :  * Defined by Linux kernel headers since Linux 5.0. Define it here if kernel
      54              :  * headers are older than that, to ensure this file builds regardless.
      55              :  */
      56              : #if defined(__aarch64__) && defined(__linux__)
      57              : 
      58              : #ifndef NT_ARM_PAC_MASK
      59              : #define NT_ARM_PAC_MASK 0x406
      60              : #endif
      61              : 
      62              : #ifndef HAVE_USER_PACK_MASK
      63              : struct user_pac_mask {
      64              :   __u64 data_mask;
      65              :   __u64 insn_mask;
      66              : };
      67              : #endif
      68              : 
      69              : #endif /* __aarch64__ && __linux__ */
      70              : 
      71              : bool
      72            0 : aarch64_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      73              :                           ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      74              :                                 void *arg __attribute__ ((unused)))
      75              : {
      76              : #if !defined(__aarch64__) || !defined(__linux__)
      77            0 :   return false;
      78              : #else /* __aarch64__ */
      79              : 
      80              :   /* General registers.  */
      81              :   struct user_regs_struct gregs;
      82              :   struct user_pac_mask pac_mask;
      83              :   struct iovec iovec;
      84              :   iovec.iov_base = &gregs;
      85              :   iovec.iov_len = sizeof (gregs);
      86              :   if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
      87              :     return false;
      88              : 
      89              :   iovec.iov_base = &pac_mask;
      90              :   iovec.iov_len = sizeof (pac_mask);
      91              :   if (ptrace (PTRACE_GETREGSET, tid, NT_ARM_PAC_MASK, &iovec) != 0)
      92              :     pac_mask.insn_mask = 0;
      93              : 
      94              :   /* X0..X30 plus SP.  */
      95              :   if (! setfunc (0, 32, (Dwarf_Word *) &gregs.regs[0], arg))
      96              :     return false;
      97              : 
      98              :   /* PC.  */
      99              :   if (! setfunc (-1, 1, (Dwarf_Word *) &gregs.pc, arg))
     100              :     return false;
     101              : 
     102              :   if (! setfunc (-2, 1, (Dwarf_Word *) &pac_mask.insn_mask, arg))
     103              :     return false;
     104              : 
     105              :   /* ELR cannot be found.  */
     106              : 
     107              :   /* RA_SIGN_STATE cannot be found */
     108              : 
     109              :   /* FP registers (only 64bits are used).  */
     110              :   struct user_fpsimd_struct fregs;
     111              :   iovec.iov_base = &fregs;
     112              :   iovec.iov_len = sizeof (fregs);
     113              :   if (ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iovec) != 0)
     114              :     return false;
     115              : 
     116              :   Dwarf_Word dwarf_fregs[32];
     117              :   for (int r = 0; r < 32; r++)
     118              :     dwarf_fregs[r] = fregs.vregs[r] & 0xFFFFFFFF;
     119              : 
     120              :   if (! setfunc (64, 32, dwarf_fregs, arg))
     121              :     return false;
     122              : 
     123              :   return true;
     124              : #endif /* __aarch64__ */
     125              : }