Guardian Procedure Calls Reference Manual

return -1;
return 0;
}
A function with no parameters cannot use _frame_edge(), nor can a C++ function whose
first parameter is a reference (that is, not a value or a pointer).
Syntax for TAL Programmers
error := REFPARAM_BOUNDSCHECK[64]_ ( start-address ! i
,area-length ! i
,framestart ! i
,flags ); ! i
Parameters
start-address
input
(for REFPARAM_BOUNDSCHECK_)STRING .EXT:ref:*
(for REFPARAM_BOUNDSCHECK64_)STRING .EXT64:ref:*
identifies the start of the data area to be bounds checked.
When REFPARAM_BOUNDSCHECK_ is called from a native process, start-address cannot
be a relative segment 1 or 2 address. Neither can it be an absolute address unless flags.<14>
is set to allow this.
When REFPARAM_BOUNDSCHECK_ is called from a TNS process, start-address can be
an absolute address that points to the TNS stack.
area-length
input
INT(32):value
is the length of the area to be checked. It is a 31-bit value. On a native processor, the area
must not span separately allocated logical areas even if the areas are contiguous in virtual
memory.
If area-length is zero (0D), start-address is not checked and
REFPARAM_BOUNDSCHECK_ returns without error.
framestart
input
(for REFPARAM_BOUNDSCHECK_)EXTADDR:value
(for REFPARAM_BOUNDSCHECK64_)EXT64ADDR:value
excludes the stack area of the calling procedure from the area that
REFPARAM_BOUNDSCHECK_ accepts as valid.
If framestart is zero, REFPARAM_BOUNDSCHECK_ verifies only that the specified memory
area is valid. It makes no attempt to verify that the specified memory area does not overlap
the part of the stack used by the calling process.
If framestart is nonzero, it specifies one edge of a region to be excluded from the valid
area. For a TNS process, the excluded area begins at the address in framestart and extends
600 bytes past the L-register setting of the procedure that calls REFPARAM_BOUNDSCHECK_.
For a native process, the excluded area begins at the start of the stack area and extends to
(but does not include) the address specified by framestart. Stack-frame overlap detection
REFPARAM_BOUNDSCHECK[64]_ Procedures 1231