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 {
        print_regdump(istate);
        panic("reserved instruction");
    }
}
 
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 1100	Rev 1119
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)
-		87	{
-		88	if (((__u32 )istate->epc) == 0x7c03e83b) {
-		89	ASSERT(THREAD);
-		90	istate->epc += 4;
-		91	istate->v1 = istate->k1;
-		92	} else {
-		93	print_regdump(istate);
-		94	panic("reserved instruction");
-		95	}
-		96	}
-		97
86	static void breakpoint_exception(int n, istate_t *istate)	98	static void breakpoint_exception(int n, istate_t *istate)
87	{	99	{
88	#ifdef CONFIG_DEBUG	100	#ifdef CONFIG_DEBUG
89	debugger_bpoint(istate);	101	debugger_bpoint(istate);
90	#else	102	#else
91	/* it is necessary to not re-execute BREAK instruction after	103	/* it is necessary to not re-execute BREAK instruction after
92	returning from Exception handler	104	returning from Exception handler
93	(see page 138 in R4000 Manual for more information) */	105	(see page 138 in R4000 Manual for more information) */
94	istate->epc += 4;	106	istate->epc += 4;
95	#endif	107	#endif
96	}	108	}
97		109
98	static void tlbmod_exception(int n, istate_t *istate)	110	static void tlbmod_exception(int n, istate_t *istate)
99	{	111	{
100	tlb_modified(istate);	112	tlb_modified(istate);
101	}	113	}
102		114
103	static void tlbinv_exception(int n, istate_t *istate)	115	static void tlbinv_exception(int n, istate_t *istate)
104	{	116	{
105	tlb_invalid(istate);	117	tlb_invalid(istate);
106	}	118	}
107		119
108	#ifdef CONFIG_FPU_LAZY	120	#ifdef CONFIG_FPU_LAZY
109	static void cpuns_exception(int n, istate_t *istate)	121	static void cpuns_exception(int n, istate_t *istate)
110	{	122	{
111	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)	123	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
112	scheduler_fpu_lazy_request();	124	scheduler_fpu_lazy_request();
113	else	125	else
114	panic("unhandled Coprocessor Unusable Exception\n");	126	panic("unhandled Coprocessor Unusable Exception\n");
115	}	127	}
116	#endif	128	#endif
117		129
118	static void interrupt_exception(int n, istate_t *istate)	130	static void interrupt_exception(int n, istate_t *istate)
119	{	131	{
120	__u32 cause;	132	__u32 cause;
121	int i;	133	int i;
122		134
123	/* decode interrupt number and process the interrupt */	135	/* decode interrupt number and process the interrupt */
124	cause = (cp0_cause_read() >> 8) &0xff;	136	cause = (cp0_cause_read() >> 8) &0xff;
125		137
126	for (i = 0; i < 8; i++)	138	for (i = 0; i < 8; i++)
127	if (cause & (1 << i))	139	if (cause & (1 << i))
128	exc_dispatch(i+INT_OFFSET, istate);	140	exc_dispatch(i+INT_OFFSET, istate);
129	}	141	}
130		142
131	/** Handle syscall userspace call */	143	/** Handle syscall userspace call */
132	static void syscall_exception(int n, istate_t *istate)	144	static void syscall_exception(int n, istate_t *istate)
133	{	145	{
134	panic("Syscall is handled through shortcut");	146	panic("Syscall is handled through shortcut");
135	}	147	}
136		148
137	void exception_init(void)	149	void exception_init(void)
138	{	150	{
139	int i;	151	int i;
140		152
141	/* Clear exception table */	153	/* Clear exception table */
142	for (i=0;i < IVT_ITEMS; i++)	154	for (i=0;i < IVT_ITEMS; i++)
143	exc_register(i, "undef", (iroutine) unhandled_exception);	155	exc_register(i, "undef", (iroutine) unhandled_exception);
144	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);	156	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
-		157	exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
145	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);	158	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
146	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);	159	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
147	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);	160	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
148	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);	161	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
149	#ifdef CONFIG_FPU_LAZY	162	#ifdef CONFIG_FPU_LAZY
150	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);	163	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
151	#endif	164	#endif
152	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);	165	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
153	}	166	}
154		167

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(root)/kernel/trunk/arch/mips32/src/exception.c – Rev 1100 → 1119