source: mainline/kernel/arch/ppc32/src/asm.S

Last change on this file was 28a5ebd, checked in by Martin Decky <martin@…>, 5 years ago

Use char32_t instead of wchat_t to represent UTF-32 strings

The intention of the native HelenOS string API has been always to
support Unicode in the UTF-8 and UTF-32 encodings as the sole character
representations and ignore the obsolete mess of older single-byte and
multibyte character encodings. Before C11, the wchar_t type has been
slightly misused for the purpose of the UTF-32 strings. The newer
char32_t type is obviously a much more suitable option. The standard
defines char32_t as uint_least32_t, thus we can take the liberty to fix
it to uint32_t.

To maintain compatilibity with the C Standard, the putwchar(wchar_t)
functions has been replaced by our custom putuchar(char32_t) functions
where appropriate.
  • Property mode set to 100644
File size: 5.6 KB
Line 
1/*
2 * Copyright (c) 2005 Martin Decky
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <abi/asmtool.h>
30#include <arch/asm/regname.h>
31#include <arch/msr.h>
32#include <arch/istate_struct.h>
33
34.text
35
36FUNCTION_BEGIN(userspace_asm)
37 /*
38 * r3 = uspace_uarg
39 * r4 = stack
40 * r5 = entry
41 */
42
43 /* Disable interrupts */
44
45 mfmsr r31
46 rlwinm r31, r31, 0, 17, 15
47 mtmsr r31
48 isync
49
50 /* Set entry point */
51
52 mtsrr0 r5
53
54 /* Set privileged state, enable interrupts */
55
56 ori r31, r31, MSR_PR
57 ori r31, r31, MSR_EE
58 mtsrr1 r31
59
60 /* Set stack */
61
62 mr sp, r4
63
64 /* %r6 is defined to hold pcb_ptr - set it to 0 */
65
66 xor r6, r6, r6
67
68 /* Jump to userspace */
69
70 rfi
71FUNCTION_END(userspace_asm)
72
73SYMBOL(iret)
74 /* Disable interrupts */
75
76 mfmsr r31
77 rlwinm r31, r31, 0, 17, 15
78 mtmsr r31
79 isync
80
81 lwz r0, ISTATE_OFFSET_R0(sp)
82 lwz r2, ISTATE_OFFSET_R2(sp)
83 lwz r3, ISTATE_OFFSET_R3(sp)
84 lwz r4, ISTATE_OFFSET_R4(sp)
85 lwz r5, ISTATE_OFFSET_R5(sp)
86 lwz r6, ISTATE_OFFSET_R6(sp)
87 lwz r7, ISTATE_OFFSET_R7(sp)
88 lwz r8, ISTATE_OFFSET_R8(sp)
89 lwz r9, ISTATE_OFFSET_R9(sp)
90 lwz r10, ISTATE_OFFSET_R10(sp)
91 lwz r11, ISTATE_OFFSET_R11(sp)
92 lwz r13, ISTATE_OFFSET_R13(sp)
93 lwz r14, ISTATE_OFFSET_R14(sp)
94 lwz r15, ISTATE_OFFSET_R15(sp)
95 lwz r16, ISTATE_OFFSET_R16(sp)
96 lwz r17, ISTATE_OFFSET_R17(sp)
97 lwz r18, ISTATE_OFFSET_R18(sp)
98 lwz r19, ISTATE_OFFSET_R19(sp)
99 lwz r20, ISTATE_OFFSET_R20(sp)
100 lwz r21, ISTATE_OFFSET_R21(sp)
101 lwz r22, ISTATE_OFFSET_R22(sp)
102 lwz r23, ISTATE_OFFSET_R23(sp)
103 lwz r24, ISTATE_OFFSET_R24(sp)
104 lwz r25, ISTATE_OFFSET_R25(sp)
105 lwz r26, ISTATE_OFFSET_R26(sp)
106 lwz r27, ISTATE_OFFSET_R27(sp)
107 lwz r28, ISTATE_OFFSET_R28(sp)
108 lwz r29, ISTATE_OFFSET_R29(sp)
109 lwz r30, ISTATE_OFFSET_R30(sp)
110 lwz r31, ISTATE_OFFSET_R31(sp)
111
112 lwz r12, ISTATE_OFFSET_CR(sp)
113 mtcr r12
114
115 lwz r12, ISTATE_OFFSET_PC(sp)
116 mtsrr0 r12
117
118 lwz r12, ISTATE_OFFSET_SRR1(sp)
119 mtsrr1 r12
120
121 lwz r12, ISTATE_OFFSET_LR(sp)
122 mtlr r12
123
124 lwz r12, ISTATE_OFFSET_CTR(sp)
125 mtctr r12
126
127 lwz r12, ISTATE_OFFSET_XER(sp)
128 mtxer r12
129
130 lwz r12, ISTATE_OFFSET_R12(sp)
131 lwz sp, ISTATE_OFFSET_SP(sp)
132
133 rfi
134
135SYMBOL(iret_syscall)
136 /* Disable interrupts */
137
138 mfmsr r31
139 rlwinm r31, r31, 0, 17, 15
140 mtmsr r31
141 isync
142
143 lwz r0, ISTATE_OFFSET_R0(sp)
144 lwz r2, ISTATE_OFFSET_R2(sp)
145 lwz r4, ISTATE_OFFSET_R4(sp)
146 lwz r5, ISTATE_OFFSET_R5(sp)
147 lwz r6, ISTATE_OFFSET_R6(sp)
148 lwz r7, ISTATE_OFFSET_R7(sp)
149 lwz r8, ISTATE_OFFSET_R8(sp)
150 lwz r9, ISTATE_OFFSET_R9(sp)
151 lwz r10, ISTATE_OFFSET_R10(sp)
152 lwz r11, ISTATE_OFFSET_R11(sp)
153 lwz r13, ISTATE_OFFSET_R13(sp)
154 lwz r14, ISTATE_OFFSET_R14(sp)
155 lwz r15, ISTATE_OFFSET_R15(sp)
156 lwz r16, ISTATE_OFFSET_R16(sp)
157 lwz r17, ISTATE_OFFSET_R17(sp)
158 lwz r18, ISTATE_OFFSET_R18(sp)
159 lwz r19, ISTATE_OFFSET_R19(sp)
160 lwz r20, ISTATE_OFFSET_R20(sp)
161 lwz r21, ISTATE_OFFSET_R21(sp)
162 lwz r22, ISTATE_OFFSET_R22(sp)
163 lwz r23, ISTATE_OFFSET_R23(sp)
164 lwz r24, ISTATE_OFFSET_R24(sp)
165 lwz r25, ISTATE_OFFSET_R25(sp)
166 lwz r26, ISTATE_OFFSET_R26(sp)
167 lwz r27, ISTATE_OFFSET_R27(sp)
168 lwz r28, ISTATE_OFFSET_R28(sp)
169 lwz r29, ISTATE_OFFSET_R29(sp)
170 lwz r30, ISTATE_OFFSET_R30(sp)
171 lwz r31, ISTATE_OFFSET_R31(sp)
172
173 lwz r12, ISTATE_OFFSET_CR(sp)
174 mtcr r12
175
176 lwz r12, ISTATE_OFFSET_PC(sp)
177 mtsrr0 r12
178
179 lwz r12, ISTATE_OFFSET_SRR1(sp)
180 mtsrr1 r12
181
182 lwz r12, ISTATE_OFFSET_LR(sp)
183 mtlr r12
184
185 lwz r12, ISTATE_OFFSET_CTR(sp)
186 mtctr r12
187
188 lwz r12, ISTATE_OFFSET_XER(sp)
189 mtxer r12
190
191 lwz r12, ISTATE_OFFSET_R12(sp)
192 lwz sp, ISTATE_OFFSET_SP(sp)
193
194 rfi
195
196FUNCTION_BEGIN(memcpy_from_uspace)
197FUNCTION_BEGIN(memcpy_to_uspace)
198 srwi. r7, r5, 3
199 addi r6, r3, -4
200 addi r4, r4, -4
201 beq 2f
202
203 andi. r0, r6, 3
204 mtctr r7
205 bne 5f
206
207 1:
208
209 lwz r7, 4(r4)
210 lwzu r8, 8(r4)
211 stw r7, 4(r6)
212 stwu r8, 8(r6)
213 bdnz 1b
214
215 andi. r5, r5, 7
216
217 2:
218
219 cmplwi 0, r5, 4
220 blt 3f
221
222 lwzu r0, 4(r4)
223 addi r5, r5, -4
224 stwu r0, 4(r6)
225
226 3:
227
228 cmpwi 0, r5, 0
229 beqlr
230 mtctr r5
231 addi r4, r4, 3
232 addi r6, r6, 3
233
234 4:
235
236 lbzu r0, 1(r4)
237 stbu r0, 1(r6)
238 bdnz 4b
239 blr
240
241 5:
242
243 subfic r0, r0, 4
244 mtctr r0
245
246 6:
247
248 lbz r7, 4(r4)
249 addi r4, r4, 1
250 stb r7, 4(r6)
251 addi r6, r6, 1
252 bdnz 6b
253 subf r5, r0, r5
254 rlwinm. r7, r5, 32-3, 3, 31
255 beq 2b
256 mtctr r7
257 b 1b
258FUNCTION_END(memcpy_from_uspace)
259FUNCTION_END(memcpy_to_uspace)
260
261SYMBOL(memcpy_from_uspace_failover_address)
262SYMBOL(memcpy_to_uspace_failover_address)
263 /* Return zero, failure */
264 xor r3, r3, r3
265 blr
266
267FUNCTION_BEGIN(early_putuchar)
268 blr
269FUNCTION_END(early_putuchar)
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