LCOV - code coverage report
Current view: top level - backends - sparc_initreg.c (source / functions) Hit Total Coverage
Test: elfutils-0.191 Lines: 0 2 0.0 %
Date: 2024-07-23 19:52:03 Functions: 0 1 0.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 0 0 -

           Branch data     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                 :            : }

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