4.26 Frame directives

Frame directives provide information in object files that enables debugging and profiling of assembly language functions.

You must use frame directives to describe the way that your code uses the stack if you want to be able to do either of the following:

  • Debug your application using stack unwinding.
  • Use either flat or call-graph profiling.

The assembler uses frame directives to insert DWARF debug frame information into the object file in ELF format that it produces. This information is required by a debugger for stack unwinding and for profiling.

Be aware of the following:

  • Frame directives do not affect the code produced by the assembler.
  • The assembler does not validate the information in frame directives against the instructions emitted.
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