author | Martin Trojer <martin.trojer@nokia.com> |
Fri, 15 Jan 2010 09:07:44 +0000 | |
changeset 34 | 92d87f2e53c2 |
permissions | -rwxr-xr-x |
34
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1 |
/* |
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2 |
|
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3 |
Copyright (C) 2000,2004 Silicon Graphics, Inc. All Rights Reserved. |
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4 |
|
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5 |
This program is free software; you can redistribute it and/or modify it |
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6 |
under the terms of version 2.1 of the GNU Lesser General Public License |
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7 |
as published by the Free Software Foundation. |
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8 |
|
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9 |
This program is distributed in the hope that it would be useful, but |
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10 |
WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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12 |
|
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13 |
Further, this software is distributed without any warranty that it is |
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14 |
free of the rightful claim of any third person regarding infringement |
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15 |
or the like. Any license provided herein, whether implied or |
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16 |
otherwise, applies only to this software file. Patent licenses, if |
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17 |
any, provided herein do not apply to combinations of this program with |
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18 |
other software, or any other product whatsoever. |
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19 |
|
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20 |
You should have received a copy of the GNU Lesser General Public |
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21 |
License along with this program; if not, write the Free Software |
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22 |
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston MA 02110-1301, |
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23 |
USA. |
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|
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25 |
Contact information: Silicon Graphics, Inc., 1500 Crittenden Lane, |
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26 |
Mountain View, CA 94043, or: |
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|
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http://www.sgi.com |
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|
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For further information regarding this notice, see: |
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|
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32 |
http://oss.sgi.com/projects/GenInfo/NoticeExplan |
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*/ |
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#include "config.h" |
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#include "libdwarfdefs.h" |
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#include <string.h> |
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#include "pro_incl.h" |
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|
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#define MORE_BYTES 0x80 |
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#define DATA_MASK 0x7f |
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#define DIGIT_WIDTH 7 |
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#define SIGN_BIT 0x40 |
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/*------------------------------------------------------------- |
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50 |
Encode val as a leb128. This encodes it as an unsigned |
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51 |
number. |
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---------------------------------------------------------------*/ |
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53 |
/* return DW_DLV_ERROR or DW_DLV_OK. |
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** space to write leb number is provided by caller, with caller |
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** passing length. |
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** number of bytes used returned thru nbytes arg |
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*/ |
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int |
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_dwarf_pro_encode_leb128_nm(Dwarf_Unsigned val, int *nbytes, |
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60 |
char *space, int splen) |
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61 |
{ |
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char *a; |
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char *end = space + splen; |
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64 |
|
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a = space; |
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66 |
do { |
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unsigned char uc; |
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68 |
|
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if (a >= end) { |
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return DW_DLV_ERROR; |
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} |
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uc = val & DATA_MASK; |
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val >>= DIGIT_WIDTH; |
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if (val != 0) { |
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75 |
uc |= MORE_BYTES; |
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} |
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*a = uc; |
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a++; |
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} while (val); |
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*nbytes = a - space; |
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return DW_DLV_OK; |
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} |
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83 |
|
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84 |
/* return DW_DLV_ERROR or DW_DLV_OK. |
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85 |
** space to write leb number is provided by caller, with caller |
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86 |
** passing length. |
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87 |
** number of bytes used returned thru nbytes arg |
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88 |
** encodes a signed number. |
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89 |
*/ |
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int |
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_dwarf_pro_encode_signed_leb128_nm(Dwarf_Signed value, int *nbytes, |
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char *space, int splen) |
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93 |
{ |
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94 |
char *str; |
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95 |
Dwarf_Signed sign = -(value < 0); |
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int more = 1; |
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char *end = space + splen; |
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98 |
|
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str = space; |
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100 |
|
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101 |
do { |
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102 |
unsigned char byte = value & DATA_MASK; |
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103 |
|
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104 |
value >>= DIGIT_WIDTH; |
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|
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if (str >= end) { |
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107 |
return DW_DLV_ERROR; |
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108 |
} |
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109 |
/* |
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110 |
* Remaining chunks would just contain the sign bit, and this chunk |
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111 |
* has already captured at least one sign bit. |
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112 |
*/ |
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if (value == sign && ((byte & SIGN_BIT) == (sign & SIGN_BIT))) { |
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114 |
more = 0; |
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115 |
} else { |
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116 |
byte |= MORE_BYTES; |
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117 |
} |
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118 |
*str = byte; |
92d87f2e53c2
Added ELF4ROM and e32test-driver
Martin Trojer <martin.trojer@nokia.com>
parents:
diff
changeset
|
119 |
str++; |
92d87f2e53c2
Added ELF4ROM and e32test-driver
Martin Trojer <martin.trojer@nokia.com>
parents:
diff
changeset
|
120 |
} while (more); |
92d87f2e53c2
Added ELF4ROM and e32test-driver
Martin Trojer <martin.trojer@nokia.com>
parents:
diff
changeset
|
121 |
*nbytes = str - space; |
92d87f2e53c2
Added ELF4ROM and e32test-driver
Martin Trojer <martin.trojer@nokia.com>
parents:
diff
changeset
|
122 |
return DW_DLV_OK; |
92d87f2e53c2
Added ELF4ROM and e32test-driver
Martin Trojer <martin.trojer@nokia.com>
parents:
diff
changeset
|
123 |
} |