source: mainline/kernel/arch/ppc32/src/exception.S@ a35b458

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since a35b458 was a35b458, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 7 years ago

style: Remove trailing whitespace on _all_ lines, including empty ones, for particular file types.

Command used: tools/srepl '\s\+$' '' -- *.c *.h *.py *.sh *.s *.S *.ag

Currently, whitespace on empty lines is very inconsistent.
There are two basic choices: Either remove the whitespace, or keep empty lines
indented to the level of surrounding code. The former is AFAICT more common,
and also much easier to do automatically.

Alternatively, we could write script for automatic indentation, and use that
instead. However, if such a script exists, it's possible to use the indented
style locally, by having the editor apply relevant conversions on load/save,
without affecting remote repository. IMO, it makes more sense to adopt
the simpler rule.
  • Property mode set to 100644
File size: 5.6 KB
Line 
1#
2# Copyright (c) 2006 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/mm/page.h>
33#include <arch/istate_struct.h>
34#include <arch/stack.h>
35#include <align.h>
36
37.section K_UNMAPPED_TEXT_START, "ax"
38
39.macro CONTEXT_STORE
40
41 # save r12 in SPRG1, backup CR in r12
42 # save SP in SPRG2
43
44 mtsprg1 r12
45 mfcr r12
46 mtsprg2 sp
47
48 # check whether the previous mode was user or kernel
49
50 mfsrr1 sp # use sp as a temporary register to hold SRR1
51 andi. sp, sp, MSR_PR
52 bne 1f
53 # previous mode was kernel
54
55 mfsprg2 sp
56 subis sp, sp, 0x8000
57 b 2f
58
59 1:
60 # previous mode was user
61
62 mfsprg0 sp
63 2:
64
65 subi sp, sp, ALIGN_UP(ISTATE_SIZE, STACK_ALIGNMENT)
66 stw r0, ISTATE_OFFSET_R0(sp)
67 stw r2, ISTATE_OFFSET_R2(sp)
68 stw r3, ISTATE_OFFSET_R3(sp)
69 stw r4, ISTATE_OFFSET_R4(sp)
70 stw r5, ISTATE_OFFSET_R5(sp)
71 stw r6, ISTATE_OFFSET_R6(sp)
72 stw r7, ISTATE_OFFSET_R7(sp)
73 stw r8, ISTATE_OFFSET_R8(sp)
74 stw r9, ISTATE_OFFSET_R9(sp)
75 stw r10, ISTATE_OFFSET_R10(sp)
76 stw r11, ISTATE_OFFSET_R11(sp)
77 stw r13, ISTATE_OFFSET_R13(sp)
78 stw r14, ISTATE_OFFSET_R14(sp)
79 stw r15, ISTATE_OFFSET_R15(sp)
80 stw r16, ISTATE_OFFSET_R16(sp)
81 stw r17, ISTATE_OFFSET_R17(sp)
82 stw r18, ISTATE_OFFSET_R18(sp)
83 stw r19, ISTATE_OFFSET_R19(sp)
84 stw r20, ISTATE_OFFSET_R20(sp)
85 stw r21, ISTATE_OFFSET_R21(sp)
86 stw r22, ISTATE_OFFSET_R22(sp)
87 stw r23, ISTATE_OFFSET_R23(sp)
88 stw r24, ISTATE_OFFSET_R24(sp)
89 stw r25, ISTATE_OFFSET_R25(sp)
90 stw r26, ISTATE_OFFSET_R26(sp)
91 stw r27, ISTATE_OFFSET_R27(sp)
92 stw r28, ISTATE_OFFSET_R28(sp)
93 stw r29, ISTATE_OFFSET_R29(sp)
94 stw r30, ISTATE_OFFSET_R30(sp)
95 stw r31, ISTATE_OFFSET_R31(sp)
96
97 stw r12, ISTATE_OFFSET_CR(sp)
98
99 mfsrr0 r12
100 stw r12, ISTATE_OFFSET_PC(sp)
101
102 mfsrr1 r12
103 stw r12, ISTATE_OFFSET_SRR1(sp)
104
105 mflr r12
106 stw r12, ISTATE_OFFSET_LR(sp)
107
108 mfctr r12
109 stw r12, ISTATE_OFFSET_CTR(sp)
110
111 mfxer r12
112 stw r12, ISTATE_OFFSET_XER(sp)
113
114 mfdar r12
115 stw r12, ISTATE_OFFSET_DAR(sp)
116
117 mfsprg1 r12
118 stw r12, ISTATE_OFFSET_R12(sp)
119
120 mfsprg2 r12
121 stw r12, ISTATE_OFFSET_SP(sp)
122
123 li r12, 0
124 stw r12, ISTATE_OFFSET_LR_FRAME(sp)
125 stw r12, ISTATE_OFFSET_SP_FRAME(sp)
126.endm
127
128.org 0x100
129SYMBOL(exc_system_reset)
130 CONTEXT_STORE
131
132 li r3, 0
133 b jump_to_kernel
134
135.org 0x200
136SYMBOL(exc_machine_check)
137 CONTEXT_STORE
138
139 li r3, 1
140 b jump_to_kernel
141
142.org 0x300
143SYMBOL(exc_data_storage)
144 CONTEXT_STORE
145
146 li r3, 2
147 b jump_to_kernel
148
149.org 0x400
150SYMBOL(exc_instruction_storage)
151 CONTEXT_STORE
152
153 li r3, 3
154 b jump_to_kernel
155
156.org 0x500
157SYMBOL(exc_external)
158 CONTEXT_STORE
159
160 li r3, 4
161 b jump_to_kernel
162
163.org 0x600
164SYMBOL(exc_alignment)
165 CONTEXT_STORE
166
167 li r3, 5
168 b jump_to_kernel
169
170.org 0x700
171SYMBOL(exc_program)
172 CONTEXT_STORE
173
174 li r3, 6
175 b jump_to_kernel
176
177.org 0x800
178SYMBOL(exc_fp_unavailable)
179 CONTEXT_STORE
180
181 li r3, 7
182 b jump_to_kernel
183
184.org 0x900
185SYMBOL(exc_decrementer)
186 CONTEXT_STORE
187
188 li r3, 8
189 b jump_to_kernel
190
191.org 0xa00
192SYMBOL(exc_reserved0)
193 CONTEXT_STORE
194
195 li r3, 9
196 b jump_to_kernel
197
198.org 0xb00
199SYMBOL(exc_reserved1)
200 CONTEXT_STORE
201
202 li r3, 10
203 b jump_to_kernel
204
205.org 0xc00
206SYMBOL(exc_syscall)
207 CONTEXT_STORE
208
209 b jump_to_kernel_syscall
210
211.org 0xd00
212SYMBOL(exc_trace)
213 CONTEXT_STORE
214
215 li r3, 12
216 b jump_to_kernel
217
218.org 0x1000
219SYMBOL(exc_itlb_miss)
220 CONTEXT_STORE
221
222 li r3, 13
223 b jump_to_kernel
224
225.org 0x1100
226SYMBOL(exc_dtlb_miss_load)
227 CONTEXT_STORE
228
229 li r3, 14
230 b jump_to_kernel
231
232.org 0x1200
233SYMBOL(exc_dtlb_miss_store)
234 CONTEXT_STORE
235
236 li r3, 15
237 b jump_to_kernel
238
239.org 0x4000
240jump_to_kernel:
241 mfsrr1 r5
242 andi. r5, r5, MSR_PR
243 bne 1f
244 # Previous mode was kernel.
245 # We can construct a proper frame linkage.
246
247 mfsrr0 r12
248 stw r12, ISTATE_OFFSET_LR_FRAME(sp)
249 mfsprg2 r12
250 stw r12, ISTATE_OFFSET_SP_FRAME(sp)
251 1:
252
253 lis r12, iret@ha
254 addi r12, r12, iret@l
255 mtlr r12
256
257 lis r12, exc_dispatch@ha
258 addi r12, r12, exc_dispatch@l
259 mtsrr0 r12
260
261 mfmsr r12
262 mfsrr1 r5
263 andi. r5, r5, MSR_FP
264 or r12, r12, r5 # Propagate MSR_FP from SRR1 to MSR
265 ori r12, r12, (MSR_IR | MSR_DR)
266 mtsrr1 r12
267
268 addis sp, sp, 0x8000
269 mr r4, sp
270
271 rfi
272
273jump_to_kernel_syscall:
274 lis r12, syscall_handler@ha
275 addi r12, r12, syscall_handler@l
276 mtsrr0 r12
277
278 lis r12, iret_syscall@ha
279 addi r12, r12, iret_syscall@l
280 mtlr r12
281
282 mfsrr1 r0
283 andi. r0, r0, MSR_FP
284 mfmsr r12
285 or r12, r12, r0 # Propagate MSR_FP from SRR1 to MSR
286 ori r12, r12, (MSR_IR | MSR_DR | MSR_EE)
287 mtsrr1 r12
288
289 addis sp, sp, 0x8000
290 rfi
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