LCOV - code coverage report
Current view: top level - backends - ppc_initreg.c (source / functions) Hit Total Coverage
Test: elfutils-0.186 Lines: 7 12 58.3 %
Date: 2021-11-11 00:14:10 Functions: 1 2 50.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 3 4 75.0 %

           Branch data     Line data    Source code
       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 <stdlib.h>
      34                 :            : #if defined(__powerpc__) && defined(__linux__)
      35                 :            : # include <sys/ptrace.h>
      36                 :            : # include <asm/ptrace.h>
      37                 :            : # include <sys/user.h>
      38                 :            : #endif
      39                 :            : 
      40                 :            : #include "system.h"
      41                 :            : 
      42                 :            : #define BACKEND ppc_
      43                 :            : #include "libebl_CPU.h"
      44                 :            : 
      45                 :            : bool
      46                 :       1197 : ppc_dwarf_to_regno (Ebl *ebl __attribute__ ((unused)), unsigned *regno)
      47                 :            : {
      48   [ +  -  +  + ]:       1197 :   switch (*regno)
      49                 :            :   {
      50                 :          8 :     case 108:
      51                 :            :       // LR uses both 65 and 108 numbers, there is no consistency for it.
      52                 :          8 :       *regno = 65;
      53                 :          8 :       return true;
      54                 :            :     case 0 ... 107:
      55                 :            :     case 109 ... (114 - 1) -1:
      56                 :            :       return true;
      57                 :          0 :     case 1200 ... 1231:
      58                 :          0 :       *regno = *regno - 1200 + (114 - 1);
      59                 :          0 :       return true;
      60                 :         16 :     default:
      61                 :         16 :       return false;
      62                 :            :   }
      63                 :            :   abort ();
      64                 :            : }
      65                 :            : 
      66                 :            : __typeof (ppc_dwarf_to_regno)
      67                 :            :      ppc64_dwarf_to_regno
      68                 :            :      __attribute__ ((alias ("ppc_dwarf_to_regno")));
      69                 :            : 
      70                 :            : bool
      71                 :          0 : ppc_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      72                 :            :                           ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      73                 :            :                                void *arg __attribute__ ((unused)))
      74                 :            : {
      75                 :            : #if !defined(__powerpc__) || !defined(__linux__)
      76                 :          0 :   return false;
      77                 :            : #else /* __powerpc__ */
      78                 :            :   union
      79                 :            :     {
      80                 :            :       struct pt_regs r;
      81                 :            :       long l[sizeof (struct pt_regs) / sizeof (long)];
      82                 :            :     }
      83                 :            :   user_regs;
      84                 :            :   eu_static_assert (sizeof (struct pt_regs) % sizeof (long) == 0);
      85                 :            :   /* PTRACE_GETREGS is EIO on kernel-2.6.18-308.el5.ppc64.  */
      86                 :            :   errno = 0;
      87                 :            :   for (unsigned regno = 0; regno < sizeof (user_regs) / sizeof (long);
      88                 :            :        regno++)
      89                 :            :     {
      90                 :            :       user_regs.l[regno] = ptrace (PTRACE_PEEKUSER, tid,
      91                 :            :                                    (void *) (uintptr_t) (regno
      92                 :            :                                                          * sizeof (long)),
      93                 :            :                                    NULL);
      94                 :            :       if (errno != 0)
      95                 :            :         return false;
      96                 :            :     }
      97                 :            : #define GPRS (sizeof (user_regs.r.gpr) / sizeof (*user_regs.r.gpr))
      98                 :            :   Dwarf_Word dwarf_regs[GPRS];
      99                 :            :   for (unsigned gpr = 0; gpr < GPRS; gpr++)
     100                 :            :     dwarf_regs[gpr] = user_regs.r.gpr[gpr];
     101                 :            :   if (! setfunc (0, GPRS, dwarf_regs, arg))
     102                 :            :     return false;
     103                 :            :   dwarf_regs[0] = user_regs.r.link;
     104                 :            :   // LR uses both 65 and 108 numbers, there is no consistency for it.
     105                 :            :   if (! setfunc (65, 1, dwarf_regs, arg))
     106                 :            :     return false;
     107                 :            :   /* Registers like msr, ctr, xer, dar, dsisr etc. are probably irrelevant
     108                 :            :      for CFI.  */
     109                 :            :   dwarf_regs[0] = user_regs.r.nip;
     110                 :            :   return setfunc (-1, 1, dwarf_regs, arg);
     111                 :            : #endif /* __powerpc__ */
     112                 :            : }
     113                 :            : 
     114                 :            : __typeof (ppc_set_initial_registers_tid)
     115                 :            :      ppc64_set_initial_registers_tid
     116                 :            :      __attribute__ ((alias ("ppc_set_initial_registers_tid")));

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