Parameter

Description

Execution result (output)

0: Terminated normally

-1: Error

File number (input)

Number that is returned when a file is opened

Beginning address of output buffer (input)

Beginning address of the buffer that contains output data

_fcharput:

        MOV.L       R2,R5           ; Set the value of R2 (file number) in R5.

        MOV.L       #PARM,R2        ; Set the address of the parameter block in R2.

        MOV.L       #IO_BUF,R4      ; Set the address of the output buffer in R4.

        MOV.L       R4,4h:5[R2]     ; Set the value of R4 (output buffer) in R2 + 4 bytes.

        MOV.B       R1,[R4]         ; Set the value of R1 (output character) in the 

                                    ; location pointed to by R4 (output buffer).

        MOV.B       R5,1h:5[R2]  ; Set the value of R5 in R2 + 1 bytes (file number).

        MOV.L       #01280000h,R1   ; Set the function code of FPUTC in R1.

        MOV.L       #SIM_IO,R3      ; Set the address of the system call in R3.

        JSR         R3              ; System call

        NOP

        MOV.L       #PARM,R1  ; Set the address of the parameter block in R1.

        MOV.B       [R1],R1   ; Set the first byte of R1 (result of execution) in R1.

        RTS                   ; Return to the address where the function was called.

         .SECTION  B,DATA,ALIGN=4

PARM:       .BLKL   2               ; Parameter block area

         .SECTION  B_1,DATA

IO_BUF:     .BLKL   1               ; Input/output buffer