WebSVN – HelenOS – Diff – /tags/0.2.0.1/kernel/arch/mips32/src/exception.c


/*
 * Copyright (C) 2003-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <arch/exception.h>
#include <arch/interrupt.h>
#include <panic.h>
#include <arch/cp0.h>
#include <arch/types.h>
#include <arch.h>
#include <debug.h>
#include <proc/thread.h>
#include <symtab.h>
#include <print.h>
#include <interrupt.h>
#include <func.h>
#include <console/kconsole.h>
#include <arch/debugger.h>
 
static char * exctable[] = {
    "Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
        "Address Error - load/instr. fetch",
        "Address Error - store",
        "Bus Error - fetch instruction",
        "Bus Error - data reference",
        "Syscall",
        "BreakPoint",
        "Reserved Instruction",
        "Coprocessor Unusable",
        "Arithmetic Overflow",
        "Trap",
        "Virtual Coherency - instruction",
        "Floating Point",
        NULL, NULL, NULL, NULL, NULL, NULL, NULL,
        "WatchHi/WatchLo", /* 23 */
        NULL, NULL, NULL, NULL, NULL, NULL, NULL,
        "Virtual Coherency - data",
};
 
static void print_regdump(istate_t *istate)
{
    char *pcsymbol = "";
    char *rasymbol = "";
 
    char *s = get_symtab_entry(istate->epc);
    if (s)
        pcsymbol = s;
    s = get_symtab_entry(istate->ra);
    if (s)
        rasymbol = s;
   
    printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);
}
 
static void unhandled_exception(int n, istate_t *istate)
{
    fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);
   
    print_regdump(istate);
    panic("unhandled exception %s\n", exctable[n]);
}
 
static void reserved_instr_exception(int n, istate_t *istate)
{
    if (*((__u32 *)istate->epc) == 0x7c03e83b) {
        ASSERT(THREAD);
        istate->epc += 4;
        istate->v1 = istate->k1;
    } else
        unhandled_exception(n, istate);
}
 
static void breakpoint_exception(int n, istate_t *istate)
{
#ifdef CONFIG_DEBUG
    debugger_bpoint(istate);
#else
    /* it is necessary to not re-execute BREAK instruction after
       returning from Exception handler
       (see page 138 in R4000 Manual for more information) */
    istate->epc += 4;
#endif
}
 
static void tlbmod_exception(int n, istate_t *istate)
{
    tlb_modified(istate);
}
 
static void tlbinv_exception(int n, istate_t *istate)
{
    tlb_invalid(istate);
}
 
#ifdef CONFIG_FPU_LAZY
static void cpuns_exception(int n, istate_t *istate)
{
    if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
        scheduler_fpu_lazy_request();
    else {
        fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");
        panic("unhandled Coprocessor Unusable Exception\n");
    }
}
#endif
 
static void interrupt_exception(int n, istate_t *istate)
{
    __u32 cause;
    int i;
   
    /* decode interrupt number and process the interrupt */
    cause = (cp0_cause_read() >> 8) &0xff;
   
    for (i = 0; i < 8; i++)
        if (cause & (1 << i))
            exc_dispatch(i+INT_OFFSET, istate);
}
 
/** Handle syscall userspace call */
static void syscall_exception(int n, istate_t *istate)
{
    panic("Syscall is handled through shortcut");
}
 
void exception_init(void)
{
    int i;
 
    /* Clear exception table */
    for (i=0;i < IVT_ITEMS; i++)
        exc_register(i, "undef", (iroutine) unhandled_exception);
    exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
    exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
    exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
    exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
    exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
    exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
#ifdef CONFIG_FPU_LAZY
    exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
#endif
    exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
}
 

Rev 1965	Rev 1968
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		43
44	static char * exctable[] = {	44	static char * exctable[] = {
45	"Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",	45	"Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
46	"Address Error - load/instr. fetch",	46	"Address Error - load/instr. fetch",
47	"Address Error - store",	47	"Address Error - store",
48	"Bus Error - fetch instruction",	48	"Bus Error - fetch instruction",
49	"Bus Error - data reference",	49	"Bus Error - data reference",
50	"Syscall",	50	"Syscall",
51	"BreakPoint",	51	"BreakPoint",
52	"Reserved Instruction",	52	"Reserved Instruction",
53	"Coprocessor Unusable",	53	"Coprocessor Unusable",
54	"Arithmetic Overflow",	54	"Arithmetic Overflow",
55	"Trap",	55	"Trap",
56	"Virtual Coherency - instruction",	56	"Virtual Coherency - instruction",
57	"Floating Point",	57	"Floating Point",
58	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	58	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
59	"WatchHi/WatchLo", /* 23 */	59	"WatchHi/WatchLo", /* 23 */
60	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	60	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
61	"Virtual Coherency - data",	61	"Virtual Coherency - data",
62	};	62	};
63		63
64	static void print_regdump(istate_t *istate)	64	static void print_regdump(istate_t *istate)
65	{	65	{
66	char *pcsymbol = "";	66	char *pcsymbol = "";
67	char *rasymbol = "";	67	char *rasymbol = "";
68		68
69	char *s = get_symtab_entry(istate->epc);	69	char *s = get_symtab_entry(istate->epc);
70	if (s)	70	if (s)
71	pcsymbol = s;	71	pcsymbol = s;
72	s = get_symtab_entry(istate->ra);	72	s = get_symtab_entry(istate->ra);
73	if (s)	73	if (s)
74	rasymbol = s;	74	rasymbol = s;
75		75
76	printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);	76	printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);
77	}	77	}
78		78
79	static void unhandled_exception(int n, istate_t *istate)	79	static void unhandled_exception(int n, istate_t *istate)
80	{	80	{
81	fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);	81	fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);
82		82
83	print_regdump(istate);	83	print_regdump(istate);
84	panic("unhandled exception %s\n", exctable[n]);	84	panic("unhandled exception %s\n", exctable[n]);
85	}	85	}
86		86
87	static void reserved_instr_exception(int n, istate_t *istate)	87	static void reserved_instr_exception(int n, istate_t *istate)
88	{	88	{
89	if (((__u32 )istate->epc) == 0x7c03e83b) {	89	if (((__u32 )istate->epc) == 0x7c03e83b) {
90	ASSERT(THREAD);	90	ASSERT(THREAD);
91	istate->epc += 4;	91	istate->epc += 4;
92	istate->v1 = istate->k1;	92	istate->v1 = istate->k1;
93	} else	93	} else
94	unhandled_exception(n, istate);	94	unhandled_exception(n, istate);
95	}	95	}
96		96
97	static void breakpoint_exception(int n, istate_t *istate)	97	static void breakpoint_exception(int n, istate_t *istate)
98	{	98	{
99	#ifdef CONFIG_DEBUG	99	#ifdef CONFIG_DEBUG
100	debugger_bpoint(istate);	100	debugger_bpoint(istate);
101	#else	101	#else
102	/* it is necessary to not re-execute BREAK instruction after	102	/* it is necessary to not re-execute BREAK instruction after
103	returning from Exception handler	103	returning from Exception handler
104	(see page 138 in R4000 Manual for more information) */	104	(see page 138 in R4000 Manual for more information) */
105	istate->epc += 4;	105	istate->epc += 4;
106	#endif	106	#endif
107	}	107	}
108		108
109	static void tlbmod_exception(int n, istate_t *istate)	109	static void tlbmod_exception(int n, istate_t *istate)
110	{	110	{
111	tlb_modified(istate);	111	tlb_modified(istate);
112	}	112	}
113		113
114	static void tlbinv_exception(int n, istate_t *istate)	114	static void tlbinv_exception(int n, istate_t *istate)
115	{	115	{
116	tlb_invalid(istate);	116	tlb_invalid(istate);
117	}	117	}
118		118
119	#ifdef CONFIG_FPU_LAZY	119	#ifdef CONFIG_FPU_LAZY
120	static void cpuns_exception(int n, istate_t *istate)	120	static void cpuns_exception(int n, istate_t *istate)
121	{	121	{
122	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)	122	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
123	scheduler_fpu_lazy_request();	123	scheduler_fpu_lazy_request();
124	else {	124	else {
125	fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");	125	fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");
126	panic("unhandled Coprocessor Unusable Exception\n");	126	panic("unhandled Coprocessor Unusable Exception\n");
127	}	127	}
128	}	128	}
129	#endif	129	#endif
130		130
131	static void interrupt_exception(int n, istate_t *istate)	131	static void interrupt_exception(int n, istate_t *istate)
132	{	132	{
133	__u32 cause;	133	__u32 cause;
134	int i;	134	int i;
135		135
136	/* decode interrupt number and process the interrupt */	136	/* decode interrupt number and process the interrupt */
137	cause = (cp0_cause_read() >> 8) &0xff;	137	cause = (cp0_cause_read() >> 8) &0xff;
138		138
139	for (i = 0; i < 8; i++)	139	for (i = 0; i < 8; i++)
140	if (cause & (1 << i))	140	if (cause & (1 << i))
141	exc_dispatch(i+INT_OFFSET, istate);	141	exc_dispatch(i+INT_OFFSET, istate);
142	}	142	}
143		143
144	/** Handle syscall userspace call */	144	/** Handle syscall userspace call */
145	static void syscall_exception(int n, istate_t *istate)	145	static void syscall_exception(int n, istate_t *istate)
146	{	146	{
147	panic("Syscall is handled through shortcut");	147	panic("Syscall is handled through shortcut");
148	}	148	}
149		149
150	void exception_init(void)	150	void exception_init(void)
151	{	151	{
152	int i;	152	int i;
153		153
154	/* Clear exception table */	154	/* Clear exception table */
155	for (i=0;i < IVT_ITEMS; i++)	155	for (i=0;i < IVT_ITEMS; i++)
156	exc_register(i, "undef", (iroutine) unhandled_exception);	156	exc_register(i, "undef", (iroutine) unhandled_exception);
157	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);	157	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
158	exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);	158	exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
159	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);	159	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
160	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);	160	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
161	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);	161	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
162	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);	162	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
163	#ifdef CONFIG_FPU_LAZY	163	#ifdef CONFIG_FPU_LAZY
164	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);	164	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
165	#endif	165	#endif
166	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);	166	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
167	}	167	}
168		168

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(root)/tags/0.2.0.1/kernel/arch/mips32/src/exception.c – Rev 1965 → 1968