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          38 :         while (1)
      65             :           {
      66          62 :             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             : }