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Note section

Sometimes a vendor or system builder needs to mark an object file with
special information that other programs will check for conformance,
compatibility, and so forth. Sections of type SHT_NOTE and program header
elements of type PT_NOTE can be used for this purpose. The note information
in sections and program header elements holds a variable amount of entries,
each of which is an array of 4-byte words in the format of the target
processor. Labels appear in Figure 8-11, ``Note information'' to help
explain note information organization, but they are not part of the
specification. 

 --------
| namesz|
|-------|
| descsz|
|-------|
|  type |
|-------|
|  name |
| . . . |
|-------|
|  desc |
| . . . |
|-------|

Figure 8-11 Note information

namesz and name
     The first namesz bytes in name contain a null-terminated character
     representation of the entry's owner or originator. There is no formal
     mechanism for avoiding name conflicts. By convention, vendors use their
     own name, such as XYZ Computer Company, as the identifier. If no name
     is present, namesz contains 0. Padding is present, if necessary, to
     ensure 4-byte alignment for the descriptor. Such padding is not
     included in namesz.

descsz and desc
     The first descsz bytes in desc hold the note descriptor. If no
     descriptor is present, descsz contains 0. Padding is present, if
     necessary, to ensure 4-byte alignment for the next note entry. Such
     padding is not included in descsz.

type  This word gives the interpretation of the descriptor. Each originator
     controls its own types; multiple interpretations of a single type value
     may exist. Thus, a program must recognize both the name and the type to
     recognize a descriptor. Types currently must be non-negative.

To illustrate, the following note segment holds two entries.

          +0    +1    +2    +3
         -----------------------
 namesz   7
         -----------------------
 descsz   0                       No descriptor
         -----------------------
 type     1
         -----------------------
 name  |   X |   Y |   Z |     |
       | ----|-----|-----|-----|
       |   C |   o |  \0 |  pad|
       | ----------------------|
 namesz|            7          |
       | ----------------------|
 descsz|            8          |
       | ----------------------|
 type  |            3          |
       | ----------------------|
 name  |   X |   Y |   Z |     |
       | ----|-----|-----|-----|
       |   C |   o |  \0 |  pad|
       | ----------------------|
 desc  |         word 0        |
       | ----------------------|
       |         word 1        |
       | ----------------------|

Figure 8-12 Example note segment

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NOTE: The system reserves note information with no name (namesz==0) and with
a zero-length name (name[0]=='\0') but currently defines no types. All other
names must have at least one non-null character.
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