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crt0_pa(3)							    crt0_pa(3)

NAME
       crt0_pa:	 crt0.o, gcrt0.o, mcrt0.o - execution startup routines for PA-
       RISC systems

SYNOPSIS
   Remarks
       PA-RISC 64-bit ELF uses only.

       This manpage describes on PA-RISC systems.  For on  Integrity  systems,
       see crt0_ia(3).

DESCRIPTION
   PA-RISC 32-bit SOM
       The  C,	Pascal,	 and  FORTRAN compilers link in the object files or to
       provide startup capabilities and environments  for  program  execution.
       All  are identical except that and provide additional functionality for
       gprof(1) and prof(1) profiling support respectively.

       The following symbols are defined in these object files:

	      An array of character pointers to the environment in which the
				  program will run.  This array is  terminated
				  by a null pointer.

	      A variable of type  short	  containing   the  FPU	 model	number
				  returned by the FP status instruction.  This
				  variable  is	initialized with data from the
				  kernel.

	      A variable of type  short containing  the	 FPU  revision	number
				  returned by the FP status instruction.  This
				  variable is initialized with data  from  the
				  kernel.

	      A variable of type  int  containing  CPU	specific  information.
				  This variable is initialized with data  from
				  the kernel.

	      A variable of type  int  containing  the	CPU  revision  of  the
				  machine.  This variable is initialized  with
				  data from the kernel.

	      A variable of type  int  containing  the	system id value for an
				  executable program.

	      Execution start address.

	      A secondary startup routine for C programs, called from
				  which in turn calls  This  routine  is  con‐
				  tained  in  the  C  library  rather than the
				  file.	 For Pascal and FORTRAN programs, this
				  symbol  labels  the  beginning  of the outer
				  block (main program) and is generated by the
				  compilers.

	      The initial address of the program's data pointer.
				  The  startup	code  loads  this address into
				  general register 27.

	      The beginning of the stack unwind table.

	      The end of the stack unwind table.

	      The beginning of the try/recover table.

	      The end of the try/recover table.

       The file defines a null procedure for so programs compiled with profil‐
       ing can be linked without profiling.

       The linker defines the following two symbols:

	      The beginning address of the program's text area.
	      The beginning address of the program's data area.

   PA-RISC 64-bit ELF
       The C, Pascal, and FORTRAN compilers link in the object file to provide
       startup capabilities and environments for program execution.   It  con‐
       tains  startup  code  that must be linked using to every PA-RISC 64-bit
       program.	 In a program, the object file is not used,  and  all  actions
       normally	 associated  with  it  are  instead done by the dynamic loader
       dld.sl(5).  Additional functionality for prof(1) and gprof(1) profiling
       support is no longer handled by

       In  a  PA-RISC  64-bit environment, processes initializers and termina‐
       tors.  Initializers are routines that are  called  before  the  program
       entry  point and terminators are routines that are called when the pro‐
       gram terminates via the routine.	 Initializers are invoked  in  reverse
       order  of  the  link  line  so that dependent libraries are initialized
       before the libraries that depend on them.  Terminators,	on  the	 other
       hand, are invoked in the forward order.

       Unlike  the  SOM	 version of for PA-RISC 64-bit ELF does not define any
       variables.  It, however, sets the following global variables:

	      A variable of type  long containing the number of arguments.

	      An array of character pointers to the arguments themselves.

	      An array of character pointers to the environment in which the
				  program will run.  This array is  terminated
				  by a null pointer.

	      A variable of type  int  containing  CPU	specific  information.
				  This variable is initialized with data  from
				  the kernel.

	      A variable of type  long	 containing   the   FPU	 model	number
				  returned by the FP status instruction.  This
				  variable  is	initialized with data from the
				  kernel.

	      A variable of type  long	containing  the	 FPU  revision	number
				  returned by the FP status instruction.  This
				  variable is initialized with data  from  the
				  kernel.

	      A variable of type  long	containing  the	 CPU  revision	of the
				  machine.  This variable is initialized  with
				  data from the kernel.

	      A variable of type  long	containing  the system id value for an
				  executable program.

	      A variable of type  long containing the requested	 thread	 local
				  storage  size.  This variable is initialized
				  with data from the kernel.

	      A variable of type  void * containing  load  information	passed
				  from the kernel.

AUTHOR
       The  features  described in this entry originated from AT&T UNIX System
       III.

FILES
SEE ALSO
   Profiling and Debugging Tools
       gprof(1)		 display call graph profile data
       monitor(3C)	 prepare execution profile
       prof(1)		 display profile data
       profil(2)	 execution time profile
   System Tools
       cc(1)		 invoke the HP-UX C compiler
       exec(2)		 execute a file
       f77(1)		 invoke the HP-UX FORTRAN compiler
       ld(1)		 invoke the link editor
       dld.sl(5)	 the PA-RISC dynamic loader
       pc(1)		 invoke the HP-UX Pascal compiler
   Miscellaneous
       end(3C)		 symbol of the last locations in program

PA-RISC Systems Only						    crt0_pa(3)
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