source: trunk/libs/newlib/src/libgloss/pa/op50n-io.S @ 546

Last change on this file since 546 was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 3.1 KB
Line 
1/* op50n-io.S -- low-level I/O routines for the Oki OP50N eval board.
2 *
3 * Copyright (c) 1995 Cygnus Support
4 *
5 * The authors hereby grant permission to use, copy, modify, distribute,
6 * and license this software and its documentation for any purpose, provided
7 * that existing copyright notices are retained in all copies and that this
8 * notice is included verbatim in any distributions. No written agreement,
9 * license, or royalty fee is required for any of the authorized uses.
10 * Modifications to this software may be copyrighted by their authors
11 * and need not follow the licensing terms described here, provided that
12 * the new terms are clearly indicated on the first page of each file where
13 * they apply.
14 */
15
16mon_start       .EQU    0xd0000000
17where_dp        .EQU    mon_start+4*4
18where_ci        .EQU    mon_start+14*4
19where_co        .EQU    mon_start+15*4
20where_read      .EQU    mon_start+22*4
21where_write     .EQU    mon_start+23*4
22
23/*
24 *int c = inbyte(wait);
25 */
26        .space $TEXT$
27        .align 4
28        .EXPORT inbyte,CODE,ARGW0=GR,RTNVAL=GR
29inbyte
30        .PROC
31        .CALLINFO CALLER,FRAME=64,SAVE_RP
32        .ENTRY
33        stw     %r2,-20(0,%r30)
34        ldo     64(%r30),%r30
35        stw     %r27,-56(0,%r30)        ; save my dp
36        ldil    l%where_dp,%r27         ; load monitors dp
37        ldw     r%where_dp(0,%r27),%r27
38        ldil    l%where_ci,%r1
39        ldw     r%where_ci(0,%r1),%r1
40        ble     0(0,%r1)
41        copy    %r31,%r2
42        ldw     -56(0,%r30),%r27        ; load my dp
43        ldw     -84(0,%r30),%r2
44        ldo     -64(%r30),%r30
45        bv      %r0(%r2)
46        nop
47        .EXIT
48        .PROCEND
49 
50/* int c = outbyte(c);
51*/
52        .EXPORT outbyte,CODE,ARGW0=GR,RTNVAL=GR
53outbyte
54        .PROC
55        .CALLINFO CALLER,FRAME=64,SAVE_RP
56        .ENTRY
57        stw     %r2,-20(0,%r30)
58        ldo     64(%r30),%r30
59        stw     %r27,-56(0,%r30)        ; save my dp
60        ldil    l%where_dp,%r27         ; load monitors dp
61        ldw     r%where_dp(0,%r27),%r27
62        ldil    l%where_co,%r1
63        ldw     r%where_co(0,%r1),%r1
64        ble     0(0,%r1)
65        copy    %r31,%r2
66        ldw     -56(0,%r30),%r27        ; load my dp
67        ldw     -84(0,%r30),%r2
68        ldo     -64(%r30),%r30
69        bv      %r0(%r2)
70        nop
71        .EXIT
72        .PROCEND
73
74#if 0
75/* cnt = read(fd, bufp, cnt);
76*/
77        .EXPORT read,CODE,ARGW0=NO,ARGW1=NO,ARGW2=NO,ARGW3=NO,RTNVAL=NO
78read
79        .PROC
80        .CALLINFO FRAME=64,CALLS,SAVE_RP
81        .ENTRY
82        stw     %r2,-20(0,%r30)
83        ldo     64(%r30),%r30
84        stw     %dp,-56(0,%r30) ; save my dp
85        ldil    l%where_dp,%dp  ; load monitors dp
86        ldw     r%where_dp(0,%dp), %dp
87        ldil    l%where_read,%r1
88        ldw     r%where_read(0,%r1), %r1
89        ble     0(0,%r1)
90        copy    %r31,%r2
91        ldw     -56(0,%r30),%dp ; load my dp
92        ldw     -84(0,%r30),%r2
93        bv      %r0(%r2)
94        ldo     -64(%r30),%r30
95        .EXIT
96        .PROCEND
97
98/* cnt = write(fd, bufp, cnt);
99*/
100        .EXPORT write,CODE,ARGW0=NO,ARGW1=NO,ARGW2=NO,ARGW3=NO,RTNVAL=NO
101write
102        .PROC
103        .CALLINFO FRAME=64,CALLS,SAVE_RP
104        .ENTRY
105        stw     %r2,-20(0,%r30)
106        ldo     64(%r30),%r30
107        stw     %dp,-56(0,%r30) ; save my dp
108        ldil    l%where_dp,%dp  ; load monitors dp
109        ldw     r%where_dp(0,%dp), %dp
110        ldil    l%where_write,%r1
111        ldw     r%where_write(0,%r1), %r1
112        ble     0(0,%r1)
113        copy    %r31,%r2
114        ldw     -56(0,%r30),%dp ; load my dp
115        ldw     -84(0,%r30),%r2
116        bv      %r0(%r2)
117        ldo     -64(%r30),%r30
118        .EXIT
119        .PROCEND
120#endif
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