Zilog Z8F0130 - Manual (Page 242)

Using the ANSI C-Compiler UM013037-1212
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Zilog Developer Studio II – Z8 Encore!
User Manual
C Source, Small Model
void fun(char ch1, char ch2) { }
Static Frame in Generated Assembly
.FRAME _n_fun,?_n_fun,RDATA
_1_fun:
DS 1
_0_fun:
DS 1
The .FRAME directive defines the beginning of the static call frame of a function. It con-
tinues to the next segment directive in assembly and has the following form:
.FRAME <framename>, <segname>, <space>
In the above example:
•
<framename> is the name of the frame being declared
•
<segname> is the name of the local and parameter segment
•
<space> is the address space that holds the static frame

If the static frame function calls other functions, then they must be referred to within the
.FRAME segment of the static frame function. This reference is done by including the
.FCALL directive. The .FCALL directive helps the linker to optimally allocate the static
call frames using the call-graph technique.
.FCALL <framename>
In the above example, <framename> is the name of the frame of the function called from
the static frame function.
For example:
void fun(char ch1, char ch2) {

fun1(ch1);

}

.FRAME _n_fun,?_n_fun,RDATA

.FCALL _n_fun1

_1_fun:

DS 1

_0_fun:

DS 1
Function Call Mechanism: Register Parameter Passing
A function (caller function) performs the following tasks when it calls another function
using the register parameter passing scheme with a dynamic or static frame: