Line data    Source code

       1             : /* Fetch live process registers from TID.
       2             :    Copyright (C) 2015 Oracle, In
       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 <stdlib.h>
      35             : #ifdef __sparc__
      36             : # include <asm/ptrace.h>
      37             : # include <sys/ptrace.h>
      38             : #endif
      39             : 
      40             : #define BACKEND sparc_
      41             : #include "libebl_CPU.h"
      42             : 
      43             : bool
      44           0 : EBLHOOK (set_initial_registers_tid) (pid_t tid __attribute__ ((unused)),
      45             :                                      ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      46             :                                      void *arg __attribute__ ((unused)))
      47             : {
      48             : #if !defined(__sparc__) || !defined( __arch64__)
      49           0 :   return false;
      50             : #else /* __sparc__ */
      51             : 
      52             : 
      53             :   /* The pt_regs structure filled in by PTRACE_GETREGS provides the
      54             :      PC, the global registers and the output registers.  Note how the
      55             :      %g0 register is not explicitly provided in the structure (it's
      56             :      value is always 0) and the resulting weird packing in the u_regs
      57             :      array: the last element is not used.  */
      58             :   
      59             :   struct pt_regs regs;
      60             :   if (ptrace (PTRACE_GETREGS, tid, &regs, 0) == -1)
      61             :     return false;
      62             : 
      63             :   /* PC: no DWARF number  */
      64             :   if (!setfunc (-1, 1, (Dwarf_Word *) &regs.tpc, arg))
      65             :     return false;
      66             :   
      67             :   /* Global registers: DWARF 0 .. 7  */
      68             :   Dwarf_Word zero = 0;
      69             :   if (!setfunc (0, 1, &zero, arg))
      70             :     return false;
      71             :   if (!setfunc (1, 7, (Dwarf_Word *) &regs.u_regs[0], arg))
      72             :     return false;
      73             : 
      74             :   /* Output registers: DWARF  8 .. 15  */
      75             :   if (!setfunc (8, 8, (Dwarf_Word *) &regs.u_regs[7], arg))
      76             :     return false;
      77             : 
      78             :   /* Local and input registers must be read from the stack.  They are
      79             :      saved in the previous stack frame.  The stack pointer is %o6,
      80             :      read above.  */
      81             : 
      82             :   Dwarf_Word locals_outs[16];
      83             :   Dwarf_Word sp = regs.u_regs[13];
      84             : 
      85             :   if (sp & 1)
      86             :     {
      87             :       /* Registers are 64 bits, and we need to apply the 2047 stack
      88             :          bias in order to get the real stack pointer.  */
      89             : 
      90             :       sp += 2047;
      91             : 
      92             :       for (unsigned i = 0; i < 16; i++)
      93             :         {
      94             :           locals_outs[i] = ptrace (PTRACE_PEEKDATA, tid,
      95             :                                    (void *) (uintptr_t) (sp + (i * 8)),
      96             :                                    NULL);
      97             :           if (errno != 0)
      98             :             return false;
      99             :         }
     100             :     }
     101             :   else
     102             :     {
     103             :       /* Registers are 32 bits.  */
     104             : 
     105             :       for (unsigned i = 0; i < 8; i++)
     106             :         {
     107             :           Dwarf_Word tuple = ptrace (PTRACE_PEEKDATA, tid,
     108             :                                      (void *) (uintptr_t) (sp + (i * 8)),
     109             :                                      NULL);
     110             :           if (errno != 0)
     111             :             return false;
     112             : 
     113             :           locals_outs[2*i] = (tuple >> 32) & 0xffffffff;
     114             :           locals_outs[2*i+1] = tuple & 0xffffffff;
     115             :         }
     116             :     }
     117             : 
     118             :   
     119             :   /* Local registers:  DWARF 16 .. 23 */
     120             :   if (!setfunc (16, 8, &locals_outs[0], arg))
     121             :     return false;
     122             :   
     123             :   /* Input registers: DWARF 24 .. 31 */
     124             :   if (!setfunc (24, 8, &locals_outs[8], arg))
     125             :     return false;
     126             : 
     127             :   return true;
     128             : #endif
     129             : }