cvs commit: src/sys/ia64/ia64 db_interface.c src/sys/ia64/include db_machdep.h src/sys/ddb db_command.c ddb.h

[Marcel Moolenaar]

marcel      2005-07-02 23:52:37 UTC

  FreeBSD src repository

  Modified files:
    sys/ia64/ia64        db_interface.c 
    sys/ia64/include     db_machdep.h 
    sys/ddb              db_command.c ddb.h 
  Log:
  Implement functions calls from within DDB on ia64. On ia64 a function
  pointer doesn't point to the first instruction of that function, but
  rather to a descriptor. The descriptor has the address of the first
  instruction, as well as the value of the global pointer. The symbol
  table doesn't know anything about descriptors, so if you lookup the
  name of a function you get the address of the first instruction. The
  cast from the address, which is the result of the symbol lookup, to a
  function pointer as is done in db_fncall is therefore invalid.
  Abstract this detail behind the DB_CALL macro. By default DB_CALL is
  defined as db_fncall_generic, which yields the old behaviour. On ia64
  the macro is defined as db_fncall_ia64, in which a descriptor is
  constructed to yield a valid function pointer.
  
  While here, introduce DB_MAXARGS. DB_MAXARGS replaces the existing
  (local) MAXARGS. The DB_MAXARGS macro can be defined by platforms to
  create a convenient maximum. By default this will be the legacy 10.
  On ia64 we define this macro to be 8, for 8 is the maximum number of
  arguments that can be passed in registers. This avoids having to
  implement spilling of arguments on the memory stack.
  
  Approved by: re (dwhite)
  
  Revision  Changes    Path
  1.60      +24 -16    src/sys/ddb/db_command.c
  1.39      +10 -0     src/sys/ddb/ddb.h
  1.27      +20 -0     src/sys/ia64/ia64/db_interface.c
  1.12      +4 -0      src/sys/ia64/include/db_machdep.h