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Subject [GitHub] [incubator-nuttx] patacongo opened a new pull request #980: Improve proxy/stub parameter passing for variadic OS interfaces.
Date Tue, 05 May 2020 22:58:40 GMT

patacongo opened a new pull request #980:

   ## Summary
   In the past a very low effort interface was used:
   - All parmeters were treated as though they were type uinptr_t, and
   - The maximum number of parmeters (6) was passed in all cases.
   The first is potentially wrong and the second is very inefficient.  This commit improves
this by:
   - Making tools/mksyscall.c more intelligent, and
   - Extending the syntax for variadic functions.
   For example, in syscall.cvs, the open() API was represened like this:
       "open","fcntl.h","","int","const char*","int","..."
   In reality, open may take only a single optional argument of type mode_t which is not the
same size as uintptr_t.  And there is not reason to pass 6 parameters in that case.
   And this has been extended to:
       "open","fcntl.h","","int","const char*","int","...","mode_t"
   The existence of the "mode_t" tells tools/mksyscall that there is at most one optional
parameter and, if present, it is of type mode_t.
   ## Impact
   This change has no effect in the FLAT build but could effect PROTECTED and KERNEL mode
builds.  Those are the only build modes that require stubs and proxies.
   ## Testing
   Verififed witih stm32f4disovery:kostest

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