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* reloc-macros.h: Add a comment about the use of the

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END_RELOC_NUMBERS symbol as a sentinel value.
        * arm.h (END_RELOC_NUMBERS): Provide a maximum value.
This commit is contained in:
Nick Clifton
2008-05-21 14:50:07 +00:00
parent 380b8bac12
commit 804c0cc6d0
3 changed files with 39 additions and 1 deletions
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28
include/elf/reloc-macros.h
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@ -43,6 +43,34 @@
R_foo_count
};
Note: The value of the symbol defined in the END_RELOC_NUMBERS
macro (R_foo_count in the case of the example above) will be
set to the value of the whichever *_RELOC macro preceeds it plus
one. Therefore if you intend to use the symbol as a sentinel for
the highest valid macro value you should make sure that the
preceeding *_RELOC macro is the highest valid number. ie a
declaration like this:
START_RELOC_NUMBERS (foo)
RELOC_NUMBER (R_foo_NONE, 0)
RELOC_NUMBER (R_foo_32, 1)
FAKE_RELOC (R_foo_illegal, 9)
FAKE_RELOC (R_foo_synonym, 0)
END_RELOC_NUMBERS (R_foo_count)
will result in R_foo_count having a value of 1 (R_foo_synonym + 1)
rather than 10 or 2 as might be expected.
Alternatively you can assign a value to END_RELOC_NUMBERS symbol
explicitly, like this:
START_RELOC_NUMBERS (foo)
RELOC_NUMBER (R_foo_NONE, 0)
RELOC_NUMBER (R_foo_32, 1)
FAKE_RELOC (R_foo_illegal, 9)
FAKE_RELOC (R_foo_synonym, 0)
END_RELOC_NUMBERS (R_foo_count = 2)
If RELOC_MACROS_GEN_FUNC *is* defined, then instead the
following function will be generated: