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       1                 :            : /* Fetch live process registers from TID.
       2                 :            :    Copyright (C) 2013 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(__s390__) && defined(__linux__)
      36                 :            : # include <sys/user.h>
      37                 :            : # include <sys/ptrace.h>
      38                 :            : # include <asm/ptrace.h>
      39                 :            : #endif
      40                 :            : 
      41                 :            : #define BACKEND s390_
      42                 :            : #include "libebl_CPU.h"
      43                 :            : 
      44                 :            : bool
      45                 :          0 : s390_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      46                 :            :                           ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      47                 :            :                                 void *arg __attribute__ ((unused)))
      48                 :            : {
      49                 :            : #if !defined(__s390__) || !defined(__linux__)
      50                 :          0 :   return false;
      51                 :            : #else /* __s390__ */
      52                 :            :   struct user user_regs;
      53                 :            :   ptrace_area parea;
      54                 :            :   parea.process_addr = (uintptr_t) &user_regs;
      55                 :            :   parea.kernel_addr = 0;
      56                 :            :   parea.len = sizeof (user_regs);
      57                 :            :   if (ptrace (PTRACE_PEEKUSR_AREA, tid, &parea, NULL) != 0)
      58                 :            :     return false;
      59                 :            :   /* If we run as s390x we get the 64-bit registers of tid.
      60                 :            :      But -m31 executable seems to use only the 32-bit parts of its
      61                 :            :      registers so we ignore the upper half.  */
      62                 :            :   Dwarf_Word dwarf_regs[16];
      63                 :            :   for (unsigned u = 0; u < 16; u++)
      64                 :            :     dwarf_regs[u] = user_regs.regs.gprs[u];
      65                 :            :   if (! setfunc (0, 16, dwarf_regs, arg))
      66                 :            :     return false;
      67                 :            :   /* Avoid conversion double -> integer.  */
      68                 :            :   eu_static_assert (sizeof user_regs.regs.fp_regs.fprs[0]
      69                 :            :                     == sizeof dwarf_regs[0]);
      70                 :            :   for (unsigned u = 0; u < 16; u++)
      71                 :            :     {
      72                 :            :       // Store the double bits as is in the Dwarf_Word without conversion.
      73                 :            :       union
      74                 :            :         {
      75                 :            :           double d;
      76                 :            :           Dwarf_Word w;
      77                 :            :         } fpr = { .d = user_regs.regs.fp_regs.fprs[u] };
      78                 :            :       dwarf_regs[u] = fpr.w;
      79                 :            :     }
      80                 :            : 
      81                 :            :   if (! setfunc (16, 16, dwarf_regs, arg))
      82                 :            :     return false;
      83                 :            :   dwarf_regs[0] = user_regs.regs.psw.addr;
      84                 :            :   return setfunc (-1, 1, dwarf_regs, arg);
      85                 :            : #endif /* __s390__ */
      86                 :            : }
      87                 :            : 
      88                 :            : void
      89                 :         48 : s390_normalize_pc (Ebl *ebl __attribute__ ((unused)), Dwarf_Addr *pc)
      90                 :            : {
      91         [ -  + ]:         48 :   assert (ebl->class == ELFCLASS32);
      92                 :            : 
      93                 :            :   /* Clear S390 bit 31.  */
      94                 :         48 :   *pc &= (1U << 31) - 1;
      95                 :         48 : }