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The .EXPORT
directive allows symbols to be defined in one program and used in
other programs. Syntax | |
.EXPORT symbol [, type] [, argument-description]... Parameters | |
- symbol
The name of an identifier whose definition is being
exported or imported. - type
A linker symbol type that can take one of the following
values: Title not available (Parameters ) - ABSOLUTE
Designates an absolute symbol. In
PA-RISC 2.0W (64-bit mode) ABSOLUTE
symbols map to STT_NOTYPE with
a section index of SHN_ABS. - DATA
Designates a data symbol. In
PA-RISC 2.0W (64-bit mode) DATA
symbols map to STT_OBJECT. - CODE
Designates a code location. The location can not
be a procedure entry. In
PA-RISC 2.0W (64-bit mode) CODE
symbols map to STT_OBJECT. - ENTRY
Designates the entry point of a procedure. In
PA-RISC 2.0W (64-bit mode) ENTRY
symbols map to STT_FUNC. - MILLICODE
Locates code for the entry point of a millicode
routine. - MILLI_EXT
Locates code for the entry point of an external
millicode routine. - PLABEL
Locates a pointer to a procedure. - PRI_PROG
Designates the primary program entry point. The
outer block of HP Pascal/HP-UX and the main program in HP FORTRAN
77/HP-UX are type PRI_PROG. In
PA-RISC 2.0W (64-bit mode) PRI_PROG symbols
map to STT_FUNC. - SEC_PROG
Designates a secondary program entry point. In
PA-RISC 2.0W (64-bit mode) SEC_PROG
symbols map to STT_FUNC.
- argument- description
Allows you to communicate to the linker the types of registers
used to receive floating point arguments and return floating point
return results. Similarly, this information can be communicated
in the .CALL
directive. The linker requires this information, since the Procedure
Calling Convention described in the documents under the topic PA-RISC
Architecture at http://www.software.hp.com/STK/ allows floating point arguments and return
values to reside in either general registers or floating point registers,
depending on source language convention. At link time, the linker
ensures that both the caller and called procedure agree on argument
location. If not, the linker may insert code to relocate the arguments
(or return result) before control is transferred to the called procedure
or a procedure return is completed. The form of argument-description
is described in “.CALL Directive”
in this chapter.
Discussion | |
The .EXPORT
directive uses a series of keywords to define a symbol to the linker.
These keywords declare the symbol's type, and its argument relocation
information if the symbol is the name of a procedure. Example | |
This example makes the symbol proc
available to the linker as an entry point. It also specifies that
the first argument is expected in a general register. .EXPORT proc,ENTRY,ARGW0=GR |
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