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              : }