1 /* $NetBSD: exception.S,v 1.13 2003/10/31 16:30:15 scw Exp $ */
2
3 /*-
4 * Copyright (c) 1994-1997 Mark Brinicombe.
5 * Copyright (c) 1994 Brini.
6 * All rights reserved.
7 *
8 * This code is derived from software written for Brini by Mark Brinicombe
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Brini.
21 * 4. The name of the company nor the name of the author may be used to
22 * endorse or promote products derived from this software without specific
23 * prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
27 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * RiscBSD kernel project
38 *
39 * exception.S
40 *
41 * Low level handlers for exception vectors
42 *
43 * Created : 24/09/94
44 *
45 * Based on kate/display/abort.s
46 *
47 */
48
49 #include "assym.s"
50
51 #include <machine/asm.h>
52 #include <machine/armreg.h>
53 #include <machine/asmacros.h>
54 __FBSDID("$FreeBSD: src/sys/arm/arm/exception.S,v 1.6 2008/04/08 10:24:41 kevlo Exp $");
55
56 .text
57 .align 0
58
59 AST_LOCALS
60
61 /*
62 * reset_entry:
63 *
64 * Handler for Reset exception.
65 */
66 ASENTRY_NP(reset_entry)
67 adr r0, Lreset_panicmsg
68 bl _C_LABEL(panic)
69 /* NOTREACHED */
70 Lreset_panicmsg:
71 .asciz "Reset vector called, LR = 0x%08x"
72 .balign 4
73
74 /*
75 * swi_entry
76 *
77 * Handler for the Software Interrupt exception.
78 */
79 ASENTRY_NP(swi_entry)
80 PUSHFRAME
81
82 mov r0, sp /* Pass the frame to any function */
83 bl _C_LABEL(swi_handler) /* It's a SWI ! */
84
85 DO_AST
86 PULLFRAME
87 movs pc, lr /* Exit */
88
89 /*
90 * prefetch_abort_entry:
91 *
92 * Handler for the Prefetch Abort exception.
93 */
94 ASENTRY_NP(prefetch_abort_entry)
95 #ifdef __XSCALE__
96 nop /* Make absolutely sure any pending */
97 nop /* imprecise aborts have occurred. */
98 #endif
99 sub lr, lr, #0x00000004 /* Adjust the lr */
100
101 PUSHFRAMEINSVC
102 ldr r1, Lprefetch_abort_handler_address
103 adr lr, exception_exit
104 mov r0, sp /* pass the stack pointer as r0 */
105 ldr pc, [r1]
106
107 Lprefetch_abort_handler_address:
108 .word _C_LABEL(prefetch_abort_handler_address)
109
110 .data
111 .global _C_LABEL(prefetch_abort_handler_address)
112
113 _C_LABEL(prefetch_abort_handler_address):
114 .word abortprefetch
115
116 .text
117 abortprefetch:
118 adr r0, abortprefetchmsg
119 b _C_LABEL(panic)
120
121 abortprefetchmsg:
122 .asciz "abortprefetch"
123 .align 0
124
125 /*
126 * data_abort_entry:
127 *
128 * Handler for the Data Abort exception.
129 */
130 ASENTRY_NP(data_abort_entry)
131 #ifdef __XSCALE__
132 nop /* Make absolutely sure any pending */
133 nop /* imprecise aborts have occurred. */
134 #endif
135
136 sub lr, lr, #0x00000008 /* Adjust the lr */
137 PUSHFRAMEINSVC /* Push trap frame and switch */
138 /* to SVC32 mode */
139 ldr r1, Ldata_abort_handler_address
140 adr lr, exception_exit
141 mov r0, sp /* pass the stack pointer as r0 */
142 ldr pc, [r1]
143 Ldata_abort_handler_address:
144 .word _C_LABEL(data_abort_handler_address)
145
146 .data
147 .global _C_LABEL(data_abort_handler_address)
148 _C_LABEL(data_abort_handler_address):
149 .word abortdata
150
151 .text
152 abortdata:
153 adr r0, abortdatamsg
154 b _C_LABEL(panic)
155
156 abortdatamsg:
157 .asciz "abortdata"
158 .align 0
159
160 /*
161 * address_exception_entry:
162 *
163 * Handler for the Address Exception exception.
164 *
165 * NOTE: This exception isn't really used on arm32. We
166 * print a warning message to the console and then treat
167 * it like a Data Abort.
168 */
169 ASENTRY_NP(address_exception_entry)
170 mrs r1, cpsr_all
171 mrs r2, spsr_all
172 mov r3, lr
173 adr r0, Laddress_exception_msg
174 bl _C_LABEL(printf) /* XXX CLOBBERS LR!! */
175 b data_abort_entry
176 Laddress_exception_msg:
177 .asciz "Address Exception CPSR=0x%08x SPSR=0x%08x LR=0x%08x\n"
178 .balign 4
179
180 /*
181 * General exception exit handler
182 * (Placed here to be within range of all the references to it)
183 *
184 * It exits straight away if not returning to USR mode.
185 * This loops around delivering any pending ASTs.
186 * Interrupts are disabled at suitable points to avoid ASTs
187 * being posted between testing and exit to user mode.
188 *
189 * This function uses PULLFRAMEFROMSVCANDEXIT and
190 * DO_AST
191 * only be called if the exception handler used PUSHFRAMEINSVC
192 *
193 */
194
195 exception_exit:
196 DO_AST
197 PULLFRAMEFROMSVCANDEXIT
198
199 /*
200 * undefined_entry:
201 *
202 * Handler for the Undefined Instruction exception.
203 *
204 * We indirect the undefined vector via the handler address
205 * in the data area. Entry to the undefined handler must
206 * look like direct entry from the vector.
207 */
208 ASENTRY_NP(undefined_entry)
209 stmfd sp!, {r0, r1}
210 ldr r0, Lundefined_handler_indirection
211 ldr r1, [sp], #0x0004
212 str r1, [r0, #0x0000]
213 ldr r1, [sp], #0x0004
214 str r1, [r0, #0x0004]
215 ldmia r0, {r0, r1, pc}
216
217
218 Lundefined_handler_indirection:
219 .word Lundefined_handler_indirection_data
220
221 /*
222 * assembly bounce code for calling the kernel
223 * undefined instruction handler. This uses
224 * a standard trap frame and is called in SVC mode.
225 */
226
227 ENTRY_NP(undefinedinstruction_bounce)
228 PUSHFRAMEINSVC
229
230 mov r0, sp
231 adr lr, exception_exit
232 b _C_LABEL(undefinedinstruction)
233
234 .data
235 .align 0
236
237 /*
238 * Indirection data
239 * 2 words use for preserving r0 and r1
240 * 3rd word contains the undefined handler address.
241 */
242
243 Lundefined_handler_indirection_data:
244 .word 0
245 .word 0
246
247 .global _C_LABEL(undefined_handler_address)
248 _C_LABEL(undefined_handler_address):
249 .word _C_LABEL(undefinedinstruction_bounce)
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