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Diffstat (limited to 'tools/objtool/Documentation/stack-validation.txt')
| -rw-r--r-- | tools/objtool/Documentation/stack-validation.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/objtool/Documentation/stack-validation.txt b/tools/objtool/Documentation/stack-validation.txt index faa47c3aafae..0189039489e9 100644 --- a/tools/objtool/Documentation/stack-validation.txt +++ b/tools/objtool/Documentation/stack-validation.txt @@ -315,6 +315,13 @@ they mean, and suggestions for how to fix them. function tracing inserts additional calls, which is not obvious from the sources). +10. file.o: warning: func()+0x5c: alternative modifies stack + + This means that an alternative includes instructions that modify the + stack. The problem is that there is only one ORC unwind table, this means + that the ORC unwind entries must be valid for each of the alternatives. + The easiest way to enforce this is to ensure alternatives do not contain + any ORC entries, which in turn implies the above constraint. If the error doesn't seem to make sense, it could be a bug in objtool. Feel free to ask the objtool maintainer for help. |