MIPS based computers use an unusual stack frame, which sometimes requires GDB to search backward in the object code to find the beginning of a function.
To improve response time (especially for embedded applications, where GDB may be restricted to a slow serial line for this search) you may want to limit the size of this search, using one of these commands:
set heuristic-fence-post limit
heuristic-fence-postmust search and therefore the longer it takes to run.
These commands are available only when GDB is configured for debugging programs on MIPS processors.
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