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1 | /* |
1 | /* |
2 | * Copyright (C) 2003-2004 Jakub Jermar |
2 | * Copyright (C) 2003-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #include <arch/exception.h> |
29 | #include <arch/exception.h> |
30 | #include <arch/interrupt.h> |
30 | #include <arch/interrupt.h> |
31 | #include <panic.h> |
31 | #include <panic.h> |
32 | #include <arch/cp0.h> |
32 | #include <arch/cp0.h> |
33 | #include <arch/types.h> |
33 | #include <arch/types.h> |
34 | #include <arch.h> |
34 | #include <arch.h> |
35 | #include <debug.h> |
35 | #include <debug.h> |
36 | #include <proc/thread.h> |
36 | #include <proc/thread.h> |
37 | #include <symtab.h> |
37 | #include <symtab.h> |
38 | #include <print.h> |
38 | #include <print.h> |
39 | #include <interrupt.h> |
39 | #include <interrupt.h> |
40 | #include <func.h> |
40 | #include <func.h> |
41 | #include <console/kconsole.h> |
41 | #include <console/kconsole.h> |
42 | #include <arch/debugger.h> |
42 | #include <arch/debugger.h> |
- | 43 | #include <syscall/syscall.h> |
|
43 | 44 | ||
44 | static char * exctable[] = { |
45 | static char * exctable[] = { |
45 | "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store", |
46 | "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store", |
46 | "Address Error - load/instr. fetch", |
47 | "Address Error - load/instr. fetch", |
47 | "Address Error - store", |
48 | "Address Error - store", |
48 | "Bus Error - fetch instruction", |
49 | "Bus Error - fetch instruction", |
49 | "Bus Error - data reference", |
50 | "Bus Error - data reference", |
50 | "Syscall", |
51 | "Syscall", |
51 | "BreakPoint", |
52 | "BreakPoint", |
52 | "Reserved Instruction", |
53 | "Reserved Instruction", |
53 | "Coprocessor Unusable", |
54 | "Coprocessor Unusable", |
54 | "Arithmetic Overflow", |
55 | "Arithmetic Overflow", |
55 | "Trap", |
56 | "Trap", |
56 | "Virtual Coherency - instruction", |
57 | "Virtual Coherency - instruction", |
57 | "Floating Point", |
58 | "Floating Point", |
58 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
59 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
59 | "WatchHi/WatchLo", /* 23 */ |
60 | "WatchHi/WatchLo", /* 23 */ |
60 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
61 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
61 | "Virtual Coherency - data", |
62 | "Virtual Coherency - data", |
62 | }; |
63 | }; |
63 | 64 | ||
64 | static void print_regdump(struct exception_regdump *pstate) |
65 | static void print_regdump(struct exception_regdump *pstate) |
65 | { |
66 | { |
66 | char *pcsymbol = ""; |
67 | char *pcsymbol = ""; |
67 | char *rasymbol = ""; |
68 | char *rasymbol = ""; |
68 | 69 | ||
69 | char *s = get_symtab_entry(pstate->epc); |
70 | char *s = get_symtab_entry(pstate->epc); |
70 | if (s) |
71 | if (s) |
71 | pcsymbol = s; |
72 | pcsymbol = s; |
72 | s = get_symtab_entry(pstate->ra); |
73 | s = get_symtab_entry(pstate->ra); |
73 | if (s) |
74 | if (s) |
74 | rasymbol = s; |
75 | rasymbol = s; |
75 | 76 | ||
76 | printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol, |
77 | printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol, |
77 | pstate->ra,rasymbol); |
78 | pstate->ra,rasymbol); |
78 | } |
79 | } |
79 | 80 | ||
80 | static void unhandled_exception(int n, void *data) |
81 | static void unhandled_exception(int n, void *data) |
81 | { |
82 | { |
82 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
83 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
83 | 84 | ||
84 | print_regdump(pstate); |
85 | print_regdump(pstate); |
85 | panic("unhandled exception %s\n", exctable[n]); |
86 | panic("unhandled exception %s\n", exctable[n]); |
86 | } |
87 | } |
87 | 88 | ||
88 | static void breakpoint_exception(int n, void *data) |
89 | static void breakpoint_exception(int n, void *data) |
89 | { |
90 | { |
90 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
91 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
91 | 92 | ||
92 | #ifdef CONFIG_DEBUG |
93 | #ifdef CONFIG_DEBUG |
93 | debugger_bpoint(pstate); |
94 | debugger_bpoint(pstate); |
94 | #else |
95 | #else |
95 | /* it is necessary to not re-execute BREAK instruction after |
96 | /* it is necessary to not re-execute BREAK instruction after |
96 | returning from Exception handler |
97 | returning from Exception handler |
97 | (see page 138 in R4000 Manual for more information) */ |
98 | (see page 138 in R4000 Manual for more information) */ |
98 | pstate->epc += 4; |
99 | pstate->epc += 4; |
99 | #endif |
100 | #endif |
100 | } |
101 | } |
101 | 102 | ||
102 | static void tlbmod_exception(int n, void *data) |
103 | static void tlbmod_exception(int n, void *data) |
103 | { |
104 | { |
104 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
105 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
105 | tlb_modified(pstate); |
106 | tlb_modified(pstate); |
106 | } |
107 | } |
107 | 108 | ||
108 | static void tlbinv_exception(int n, void *data) |
109 | static void tlbinv_exception(int n, void *data) |
109 | { |
110 | { |
110 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
111 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
111 | tlb_invalid(pstate); |
112 | tlb_invalid(pstate); |
112 | } |
113 | } |
113 | 114 | ||
114 | #ifdef CONFIG_FPU_LAZY |
115 | #ifdef CONFIG_FPU_LAZY |
115 | static void cpuns_exception(int n, void *data) |
116 | static void cpuns_exception(int n, void *data) |
116 | { |
117 | { |
117 | if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id) |
118 | if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id) |
118 | scheduler_fpu_lazy_request(); |
119 | scheduler_fpu_lazy_request(); |
119 | else |
120 | else |
120 | panic("unhandled Coprocessor Unusable Exception\n"); |
121 | panic("unhandled Coprocessor Unusable Exception\n"); |
121 | } |
122 | } |
122 | #endif |
123 | #endif |
123 | 124 | ||
124 | static void interrupt_exception(int n, void *pstate) |
125 | static void interrupt_exception(int n, void *pstate) |
125 | { |
126 | { |
126 | __u32 cause; |
127 | __u32 cause; |
127 | int i; |
128 | int i; |
128 | 129 | ||
129 | /* decode interrupt number and process the interrupt */ |
130 | /* decode interrupt number and process the interrupt */ |
130 | cause = (cp0_cause_read() >> 8) &0xff; |
131 | cause = (cp0_cause_read() >> 8) &0xff; |
131 | 132 | ||
132 | for (i = 0; i < 8; i++) |
133 | for (i = 0; i < 8; i++) |
133 | if (cause & (1 << i)) |
134 | if (cause & (1 << i)) |
134 | exc_dispatch(i+INT_OFFSET, pstate); |
135 | exc_dispatch(i+INT_OFFSET, pstate); |
135 | } |
136 | } |
136 | 137 | ||
- | 138 | #include <debug.h> |
|
- | 139 | /** Handle syscall userspace call */ |
|
- | 140 | static void syscall_exception(int n, void *data) |
|
- | 141 | { |
|
- | 142 | struct exception_regdump *pstate = (struct exception_regdump *)data; |
|
- | 143 | ||
- | 144 | if (pstate->a3 < SYSCALL_END) |
|
- | 145 | pstate->v0 = syscall_table[pstate->a3](pstate->a0, |
|
- | 146 | pstate->a1, |
|
- | 147 | pstate->a2); |
|
- | 148 | else |
|
- | 149 | panic("Undefined syscall %d", pstate->a3); |
|
- | 150 | pstate->epc += 4; |
|
- | 151 | } |
|
- | 152 | ||
137 | 153 | ||
138 | void exception(struct exception_regdump *pstate) |
154 | void exception(struct exception_regdump *pstate) |
139 | { |
155 | { |
140 | int cause; |
156 | int cause; |
141 | int excno; |
157 | int excno; |
142 | 158 | ||
143 | ASSERT(CPU != NULL); |
159 | ASSERT(CPU != NULL); |
144 | 160 | ||
145 | /* |
161 | /* |
146 | * NOTE ON OPERATION ORDERING |
162 | * NOTE ON OPERATION ORDERING |
147 | * |
163 | * |
148 | * On entry, interrupts_disable() must be called before |
164 | * On entry, interrupts_disable() must be called before |
149 | * exception bit is cleared. |
165 | * exception bit is cleared. |
150 | */ |
166 | */ |
151 | 167 | ||
152 | interrupts_disable(); |
168 | interrupts_disable(); |
153 | cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
169 | cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit | |
154 | cp0_status_um_bit)); |
170 | cp0_status_um_bit)); |
155 | 171 | ||
156 | /* Save pstate so that the threads can access it */ |
172 | /* Save pstate so that the threads can access it */ |
157 | /* If THREAD->pstate is set, this is nested exception, |
173 | /* If THREAD->pstate is set, this is nested exception, |
158 | * do not rewrite it |
174 | * do not rewrite it |
159 | */ |
175 | */ |
160 | if (THREAD && !THREAD->pstate) |
176 | if (THREAD && !THREAD->pstate) |
161 | THREAD->pstate = pstate; |
177 | THREAD->pstate = pstate; |
162 | 178 | ||
163 | cause = cp0_cause_read(); |
179 | cause = cp0_cause_read(); |
164 | excno = cp0_cause_excno(cause); |
180 | excno = cp0_cause_excno(cause); |
165 | /* Dispatch exception */ |
181 | /* Dispatch exception */ |
166 | exc_dispatch(excno, pstate); |
182 | exc_dispatch(excno, pstate); |
167 | 183 | ||
168 | /* Set to NULL, so that we can still support nested |
184 | /* Set to NULL, so that we can still support nested |
169 | * exceptions |
185 | * exceptions |
170 | * TODO: We should probably set EXL bit before this command, |
186 | * TODO: We should probably set EXL bit before this command, |
171 | * nesting. On the other hand, if some exception occurs between |
187 | * nesting. On the other hand, if some exception occurs between |
172 | * here and ERET, it won't set anything on the pstate anyway. |
188 | * here and ERET, it won't set anything on the pstate anyway. |
173 | */ |
189 | */ |
174 | if (THREAD) |
190 | if (THREAD) |
175 | THREAD->pstate = NULL; |
191 | THREAD->pstate = NULL; |
176 | } |
192 | } |
177 | 193 | ||
178 | void exception_init(void) |
194 | void exception_init(void) |
179 | { |
195 | { |
180 | int i; |
196 | int i; |
181 | 197 | ||
182 | /* Clear exception table */ |
198 | /* Clear exception table */ |
183 | for (i=0;i < IVT_ITEMS; i++) |
199 | for (i=0;i < IVT_ITEMS; i++) |
184 | exc_register(i, "undef", unhandled_exception); |
200 | exc_register(i, "undef", unhandled_exception); |
185 | exc_register(EXC_Bp, "bkpoint", breakpoint_exception); |
201 | exc_register(EXC_Bp, "bkpoint", breakpoint_exception); |
186 | exc_register(EXC_Mod, "tlb_mod", tlbmod_exception); |
202 | exc_register(EXC_Mod, "tlb_mod", tlbmod_exception); |
187 | exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception); |
203 | exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception); |
188 | exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception); |
204 | exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception); |
189 | exc_register(EXC_Int, "interrupt", interrupt_exception); |
205 | exc_register(EXC_Int, "interrupt", interrupt_exception); |
190 | #ifdef CONFIG_FPU_LAZY |
206 | #ifdef CONFIG_FPU_LAZY |
191 | exc_register(EXC_CpU, "cpunus", cpuns_exception); |
207 | exc_register(EXC_CpU, "cpunus", cpuns_exception); |
192 | #endif |
208 | #endif |
- | 209 | exc_register(EXC_Sys, "syscall", syscall_exception); |
|
193 | } |
210 | } |
194 | 211 |