WebSVN – HelenOS-historic – Diff – /kernel/trunk/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)
{
    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
        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 1119	Rev 1126
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,	76	printf("PC: %X(%s) RA: %X(%s), SP(%P)\n",istate->epc,pcsymbol,
77	istate->ra,rasymbol, istate->sp);	77	istate->ra,rasymbol, istate->sp);
78	}	78	}
79		79
80	static void unhandled_exception(int n, istate_t *istate)	80	static void unhandled_exception(int n, istate_t *istate)
81	{	81	{
82	print_regdump(istate);	82	print_regdump(istate);
83	panic("unhandled exception %s\n", exctable[n]);	83	panic("unhandled exception %s\n", exctable[n]);
84	}	84	}
85		85
86	static void reserved_instr_exception(int n, istate_t *istate)	86	static void reserved_instr_exception(int n, istate_t *istate)
87	{	87	{
88	if (((__u32 )istate->epc) == 0x7c03e83b) {	88	if (((__u32 )istate->epc) == 0x7c03e83b) {
89	ASSERT(THREAD);	89	ASSERT(THREAD);
90	istate->epc += 4;	90	istate->epc += 4;
91	istate->v1 = istate->k1;	91	istate->v1 = istate->k1;
92	} else {	92	} else
93	print_regdump(istate);	93	unhandled_exception(n, istate);
94	panic("reserved instruction");	-
95	}	-
96	}	94	}
97		95
98	static void breakpoint_exception(int n, istate_t *istate)	96	static void breakpoint_exception(int n, istate_t *istate)
99	{	97	{
100	#ifdef CONFIG_DEBUG	98	#ifdef CONFIG_DEBUG
101	debugger_bpoint(istate);	99	debugger_bpoint(istate);
102	#else	100	#else
103	/* it is necessary to not re-execute BREAK instruction after	101	/* it is necessary to not re-execute BREAK instruction after
104	returning from Exception handler	102	returning from Exception handler
105	(see page 138 in R4000 Manual for more information) */	103	(see page 138 in R4000 Manual for more information) */
106	istate->epc += 4;	104	istate->epc += 4;
107	#endif	105	#endif
108	}	106	}
109		107
110	static void tlbmod_exception(int n, istate_t *istate)	108	static void tlbmod_exception(int n, istate_t *istate)
111	{	109	{
112	tlb_modified(istate);	110	tlb_modified(istate);
113	}	111	}
114		112
115	static void tlbinv_exception(int n, istate_t *istate)	113	static void tlbinv_exception(int n, istate_t *istate)
116	{	114	{
117	tlb_invalid(istate);	115	tlb_invalid(istate);
118	}	116	}
119		117
120	#ifdef CONFIG_FPU_LAZY	118	#ifdef CONFIG_FPU_LAZY
121	static void cpuns_exception(int n, istate_t *istate)	119	static void cpuns_exception(int n, istate_t *istate)
122	{	120	{
123	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)	121	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
124	scheduler_fpu_lazy_request();	122	scheduler_fpu_lazy_request();
125	else	123	else
126	panic("unhandled Coprocessor Unusable Exception\n");	124	panic("unhandled Coprocessor Unusable Exception\n");
127	}	125	}
128	#endif	126	#endif
129		127
130	static void interrupt_exception(int n, istate_t *istate)	128	static void interrupt_exception(int n, istate_t *istate)
131	{	129	{
132	__u32 cause;	130	__u32 cause;
133	int i;	131	int i;
134		132
135	/* decode interrupt number and process the interrupt */	133	/* decode interrupt number and process the interrupt */
136	cause = (cp0_cause_read() >> 8) &0xff;	134	cause = (cp0_cause_read() >> 8) &0xff;
137		135
138	for (i = 0; i < 8; i++)	136	for (i = 0; i < 8; i++)
139	if (cause & (1 << i))	137	if (cause & (1 << i))
140	exc_dispatch(i+INT_OFFSET, istate);	138	exc_dispatch(i+INT_OFFSET, istate);
141	}	139	}
142		140
143	/** Handle syscall userspace call */	141	/** Handle syscall userspace call */
144	static void syscall_exception(int n, istate_t *istate)	142	static void syscall_exception(int n, istate_t *istate)
145	{	143	{
146	panic("Syscall is handled through shortcut");	144	panic("Syscall is handled through shortcut");
147	}	145	}
148		146
149	void exception_init(void)	147	void exception_init(void)
150	{	148	{
151	int i;	149	int i;
152		150
153	/* Clear exception table */	151	/* Clear exception table */
154	for (i=0;i < IVT_ITEMS; i++)	152	for (i=0;i < IVT_ITEMS; i++)
155	exc_register(i, "undef", (iroutine) unhandled_exception);	153	exc_register(i, "undef", (iroutine) unhandled_exception);
156	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);	154	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
157	exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);	155	exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
158	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);	156	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
159	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);	157	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
160	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);	158	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
161	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);	159	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
162	#ifdef CONFIG_FPU_LAZY	160	#ifdef CONFIG_FPU_LAZY
163	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);	161	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
164	#endif	162	#endif
165	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);	163	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
166	}	164	}
167		165

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(root)/kernel/trunk/arch/mips32/src/exception.c – Rev 1119 → 1126