1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
; $Id: bs3-cmn-PrintStrN.asm $
;; @file
; BS3Kit - Bs3PrintStrN.
;
;
; Copyright (C) 2007-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
;*********************************************************************************************************************************
;* Header Files *
;*********************************************************************************************************************************
%include "bs3kit-template-header.mac"
;*********************************************************************************************************************************
;* External Symbols *
;*********************************************************************************************************************************
%if TMPL_BITS == 16
BS3_EXTERN_DATA16 g_bBs3CurrentMode
%endif
BS3_EXTERN_CMN Bs3Syscall
TMPL_BEGIN_TEXT
;;
; @cproto BS3_DECL(void) Bs3PrintStrN_c16(const char BS3_FAR *pszString, size_t cchString);
;
; ASSUMES cchString < 64KB!
;
BS3_PROC_BEGIN_CMN Bs3PrintStrN, BS3_PBC_NEAR
BS3_CALL_CONV_PROLOG 2
push xBP
mov xBP, xSP
push xAX
push xCX
push xBX
push xSI
%if TMPL_BITS == 16
; If we're in real mode or v8086 mode, call the VGA BIOS directly.
mov bl, [g_bBs3CurrentMode]
cmp bl, BS3_MODE_RM
je .do_bios_call
%if 0
test bl, BS3_MODE_CODE_V86
jz .do_system_call
%else
jmp .do_system_call
%endif
;
; We can do the work right here.
;
.do_bios_call:
push ds
lds si, [xBP + xCB + cbCurRetAddr] ; DS:SI -> string.
cld
mov cx, [xBP + xCB + cbCurRetAddr + sCB] ; Use CX for counting down.
call Bs3PrintStrN_c16_CX_Bytes_At_DS_SI
pop ds
jmp .return
%endif
;
; Need to do system call(s).
; String goes into CX:xSI, count into DX.
;
; We must ensure the string is real-mode addressable first, if not we
; must do it char-by-char.
;
.do_system_call:
%if TMPL_BITS == 16
mov cx, [xBP + xCB + cbCurRetAddr + 2]
%else
mov cx, ds
%endif
mov xSI, [xBP + xCB + cbCurRetAddr]
mov dx, [xBP + xCB + cbCurRetAddr + sCB]
%if TMPL_BITS == 16
%else
cmp xSI, _1M
jae .char_by_char
%endif
mov ax, BS3_SYSCALL_PRINT_STR
call Bs3Syscall ; near! no BS3_CALL!
.return:
pop xSI
pop xBX
pop xCX
pop xAX
pop xBP
BS3_CALL_CONV_EPILOG 2
BS3_HYBRID_RET
;
; Doesn't look like it's real-mode addressable. So, char-by-char.
;
.char_by_char:
%if TMPL_BITS == 16
push es
mov es, cx
%endif
cld
test dx, dx
jz .char_by_char_return
.char_by_char_loop:
mov ax, BS3_SYSCALL_PRINT_CHR
mov cl, [BS3_ONLY_16BIT(es:) xSI]
call Bs3Syscall ; near! no BS3_CALL!
inc xSI
dec xDX
jnz .char_by_char_loop
.char_by_char_return:
%if TMPL_BITS == 16
pop es
%endif
jmp .return
BS3_PROC_END_CMN Bs3PrintStrN
%if TMPL_BITS == 16
;
; This code is shared with the system handler.
;
; @param CX Number of byte sto print.
; @param DS:SI The string to print
; @uses AX, BX, CX, SI
;
BS3_PROC_BEGIN Bs3PrintStrN_c16_CX_Bytes_At_DS_SI
CPU 8086
; Check if CX is zero first.
test cx, cx
jz .bios_loop_done
; The loop, processing the string char-by-char.
.bios_loop:
mov bx, 0ff00h
lodsb ; al = next char
cmp al, 0ah ; \n
je .bios_loop_newline
%ifdef BS3_STRICT
test al, al
jnz .not_zero
hlt
.not_zero:
%endif
mov ah, 0eh
.bios_loop_int10h:
int 10h
loop .bios_loop
.bios_loop_done:
ret
.bios_loop_newline:
mov ax, 0e0dh ; cmd + '\r'.
int 10h
mov ax, 0e0ah ; cmd + '\n'.
mov bx, 0ff00h
jmp .bios_loop_int10h
BS3_PROC_END Bs3PrintStrN_c16_CX_Bytes_At_DS_SI
;
; Generate 16-bit far stub.
; Peformance critical, so don't penalize near calls.
;
BS3_CMN_FAR_STUB Bs3PrintStrN, 6
%endif
|
