Branch data     Line data    Source code

       1                 :            : /* Add signed little endian base 128 integer to a section.
       2                 :            :    Copyright (C) 2002, 2005 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 2002.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <inttypes.h>
      35                 :            : #include <string.h>
      36                 :            : 
      37                 :            : #include <libasmP.h>
      38                 :            : 
      39                 :            : 
      40                 :            : int
      41                 :         16 : asm_addsleb128 (AsmScn_t *asmscn, int32_t num)
      42                 :            : {
      43         [ +  - ]:         16 :   if (asmscn == NULL)
      44                 :            :     return -1;
      45                 :            : 
      46   [ -  +  -  - ]:         16 :   if (asmscn->type == SHT_NOBITS && unlikely (num != 0))
      47                 :            :     {
      48                 :          0 :       __libasm_seterrno (ASM_E_TYPE);
      49                 :          0 :       return -1;
      50                 :            :     }
      51                 :            : 
      52         [ -  + ]:         16 :   if (unlikely (asmscn->ctx->textp))
      53                 :          0 :     fprintf (asmscn->ctx->out.file, "\t.sleb128\t%" PRId32 "\n", num);
      54                 :            :   else
      55                 :            :     {
      56                 :         16 :       char tmpbuf[(sizeof (num) * 8 + 6) / 7];
      57                 :         16 :       char *dest = tmpbuf;
      58                 :         16 :       uint32_t byte;
      59                 :         16 :       int32_t endval = num >> 31;
      60                 :            : 
      61         [ +  + ]:         16 :       if (num == 0)
      62                 :            :         byte = 0;
      63                 :            :       else
      64                 :         62 :         while (1)
      65                 :            :           {
      66                 :         38 :             byte = num & 0x7f;
      67                 :            : 
      68                 :         38 :             num >>= 7;
      69         [ +  + ]:         38 :             if (num == endval)
      70                 :            :               /* This is the last byte.  */
      71                 :            :               break;
      72                 :            : 
      73                 :         24 :             *dest++ = byte | 0x80;
      74                 :            :           }
      75                 :            : 
      76                 :         16 :       *dest++ = byte;
      77                 :            : 
      78                 :            :       /* Number of bytes produced.  */
      79                 :         16 :       size_t nbytes = dest - tmpbuf;
      80                 :            : 
      81                 :            :       /* Make sure we have enough room.  */
      82         [ -  + ]:         16 :       if (__libasm_ensure_section_space (asmscn, nbytes) != 0)
      83                 :          0 :         return -1;
      84                 :            : 
      85                 :            :       /* Copy the bytes.  */
      86         [ +  - ]:         16 :       if (likely (asmscn->type != SHT_NOBITS))
      87                 :         16 :         memcpy (&asmscn->content->data[asmscn->content->len], tmpbuf, nbytes);
      88                 :            : 
      89                 :            :       /* Adjust the pointer in the data buffer.  */
      90                 :         16 :       asmscn->content->len += nbytes;
      91                 :            : 
      92                 :            :       /* Increment the offset in the (sub)section.  */
      93                 :         16 :       asmscn->offset += nbytes;
      94                 :            :     }
      95                 :            : 
      96                 :            :   return 0;
      97                 :            : }