Texas Instruments TMS34010 User Manual

TMS34010 C Run-Time Environment
BEFORE CALL
AFTER PASSING
ARGUMENTS UPON ENTRY
AFTER. SAVING AFTER ALLOCATING
. USED REGISTERS LOCAL FRAME
A13-+t------i A13 A13
A13 A13
AR~N
•
•
AR~N
•
•
AR~N
•
•
A14-+1------i
AR~N
•
•
A14
ARG 1
A14'
ARG 1
A14'
ARB 1
A13'
ARB 1
LOCAL
FRAME
A14"
,
,-
V
/
SP'
SP'
OLD OLD
REGISTERS
. REGISTERS
SP'
(A13)
(A13)
OLD PC OLD PC
OLD PC
SP
OLDA14 OLD A14
OLD A14 OLD A14
SP-+l------i
Figure 5-1. Typical Function Call with Parameters Passed, No Value Returned
5.5.1 Register Usage Within Functions
Each function must save the contents of each register used on entrance to the
function and restore those contents on exiting the function.
AB is the only
exception; its contents do not have to be saved and restored.
If an integer value or a pointer is to be returned from a function, it must be
placed in AB.
Registers BO through B14 are available for use by the assembly-language
programmer and
are not used by the C compiler.
5.5.2 Passing Parameters
5-8
Any parameters passed to a C function follow the strict rules used by the
compiler. These
rules are in the following list.
Note:
If these rules are not followed, the Crun-time environment will be cor-
rupted and
will crash at some later time.
1 )
If the function is defined not to have any parameters, none may be
passed.
2) If the function is defined to have one or more parameters, at least one
parameter must be passed to the function.,

Texas Instruments TMS34010 Specifications

General

Brand	Texas Instruments
Model	TMS34010
Category	Computer Hardware
Language	English