WebSVN – HelenOS – Diff – /trunk/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>
 
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(struct exception_regdump *pstate)
{
    char *pcsymbol = "";
    char *rasymbol = "";
 
    char *s = get_symtab_entry(pstate->epc);
    if (s)
        pcsymbol = s;
    s = get_symtab_entry(pstate->ra);
    if (s)
        rasymbol = s;
   
    printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,
           pstate->ra,rasymbol);
}
 
static void unhandled_exception(int n, void *data)
{
    struct exception_regdump *pstate = (struct exception_regdump *)data;
 
    print_regdump(pstate);
    panic("unhandled exception %s\n", exctable[n]);
}
 
static void breakpoint_exception(int n, void *data)
{
    struct exception_regdump *pstate = (struct exception_regdump *)data;
    char *symbol = get_symtab_entry(pstate->epc);
 
#ifdef CONFIG_DEBUG 
    printf("***Breakpoint %p in %s.\n", pstate->epc, symbol);
    printf("***Type 'exit' to exit kconsole.\n");
    /* Umm..we should rather set some 'debugstate' here */
    haltstate = 1;
    kconsole("debug");
    haltstate = 0;
#endif
 
    /* it is necessary to not re-execute BREAK instruction after
       returning from Exception handler
       (see page 138 in R4000 Manual for more information) */
    pstate->epc += 4;
}
 
static void tlbmod_exception(int n, void *data)
{
    struct exception_regdump *pstate = (struct exception_regdump *)data;
    tlb_modified(pstate);
}
 
static void tlbinv_exception(int n, void *data)
{
    struct exception_regdump *pstate = (struct exception_regdump *)data;
    tlb_invalid(pstate);
}
 
static void cpuns_exception(int n, void *data)
{
    if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
        scheduler_fpu_lazy_request();
    else
        panic("unhandled Coprocessor Unusable Exception\n");
}
 
static void interrupt_exception(int n, void *pstate)
{
    __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, pstate);
}
 
 
void exception(struct exception_regdump *pstate)
{
    int cause;
    int excno;
    __u32 epc_shift = 0;
 
    ASSERT(CPU != NULL);
 
    /*
     * NOTE ON OPERATION ORDERING
     *
     * On entry, interrupts_disable() must be called before
     * exception bit is cleared.
     */
 
    interrupts_disable();
    cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit |
                        cp0_status_um_bit));
 
    /* Save pstate so that the threads can access it */
    /* If THREAD->pstate is set, this is nested exception,
     * do not rewrite it
     */
    if (THREAD && !THREAD->pstate)
        THREAD->pstate = pstate;
 
    cause = cp0_cause_read();
    excno = cp0_cause_excno(cause);
    /* Dispatch exception */
    exc_dispatch(excno, pstate);
 
    /* Set to NULL, so that we can still support nested
     * exceptions
     * TODO: We should probably set EXL bit before this command,
     * nesting. On the other hand, if some exception occurs between
     * here and ERET, it won't set anything on the pstate anyway.
     */
    if (THREAD)
        THREAD->pstate = NULL;
}
 
void exception_init(void)
{
    int i;
 
    /* Clear exception table */
    for (i=0;i < IVT_ITEMS; i++)
        exc_register(i, "undef", unhandled_exception);
    exc_register(EXC_Bp, "bkpoint", breakpoint_exception);
    exc_register(EXC_Mod, "tlb_mod", tlbmod_exception);
    exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception);
    exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception);
    exc_register(EXC_Int, "interrupt", interrupt_exception);
#ifdef CONFIG_FPU_LAZY
    exc_register(EXC_CpU, "cpunus", cpuns_exception);
#endif
}
 

Rev 593	Rev 609
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>
-		41	#include <console/kconsole.h>
40		42
41	static char * exctable[] = {	43	static char * exctable[] = {
42	"Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",	44	"Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
43	"Address Error - load/instr. fetch",	45	"Address Error - load/instr. fetch",
44	"Address Error - store",	46	"Address Error - store",
45	"Bus Error - fetch instruction",	47	"Bus Error - fetch instruction",
46	"Bus Error - data reference",	48	"Bus Error - data reference",
47	"Syscall",	49	"Syscall",
48	"BreakPoint",	50	"BreakPoint",
49	"Reserved Instruction",	51	"Reserved Instruction",
50	"Coprocessor Unusable",	52	"Coprocessor Unusable",
51	"Arithmetic Overflow",	53	"Arithmetic Overflow",
52	"Trap",	54	"Trap",
53	"Virtual Coherency - instruction",	55	"Virtual Coherency - instruction",
54	"Floating Point",	56	"Floating Point",
55	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	57	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
56	"WatchHi/WatchLo", /* 23 */	58	"WatchHi/WatchLo", /* 23 */
57	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	59	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
58	"Virtual Coherency - data",	60	"Virtual Coherency - data",
59	};	61	};
60		62
61	static void print_regdump(struct exception_regdump *pstate)	63	static void print_regdump(struct exception_regdump *pstate)
62	{	64	{
63	char *pcsymbol = "";	65	char *pcsymbol = "";
64	char *rasymbol = "";	66	char *rasymbol = "";
65		67
66	char *s = get_symtab_entry(pstate->epc);	68	char *s = get_symtab_entry(pstate->epc);
67	if (s)	69	if (s)
68	pcsymbol = s;	70	pcsymbol = s;
69	s = get_symtab_entry(pstate->ra);	71	s = get_symtab_entry(pstate->ra);
70	if (s)	72	if (s)
71	rasymbol = s;	73	rasymbol = s;
72		74
73	printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,	75	printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,
74	pstate->ra,rasymbol);	76	pstate->ra,rasymbol);
75	}	77	}
76		78
77	static void unhandled_exception(int n, void *data)	79	static void unhandled_exception(int n, void *data)
78	{	80	{
79	struct exception_regdump pstate = (struct exception_regdump )data;	81	struct exception_regdump pstate = (struct exception_regdump )data;
80		82
81	print_regdump(pstate);	83	print_regdump(pstate);
82	panic("unhandled exception %s\n", exctable[n]);	84	panic("unhandled exception %s\n", exctable[n]);
83	}	85	}
84		86
85	static void breakpoint_exception(int n, void *data)	87	static void breakpoint_exception(int n, void *data)
86	{	88	{
87	struct exception_regdump pstate = (struct exception_regdump )data;	89	struct exception_regdump pstate = (struct exception_regdump )data;
-		90	char *symbol = get_symtab_entry(pstate->epc);
-		91
-		92	#ifdef CONFIG_DEBUG
-		93	printf("***Breakpoint %p in %s.\n", pstate->epc, symbol);
-		94	printf("***Type 'exit' to exit kconsole.\n");
-		95	/* Umm..we should rather set some 'debugstate' here */
-		96	haltstate = 1;
-		97	kconsole("debug");
-		98	haltstate = 0;
-		99	#endif
-		100
88	/* it is necessary to not re-execute BREAK instruction after	101	/* it is necessary to not re-execute BREAK instruction after
89	returning from Exception handler	102	returning from Exception handler
90	(see page 138 in R4000 Manual for more information) */	103	(see page 138 in R4000 Manual for more information) */
91	pstate->epc += 4;	104	pstate->epc += 4;
92	}	105	}
93		106
94	static void tlbmod_exception(int n, void *data)	107	static void tlbmod_exception(int n, void *data)
95	{	108	{
96	struct exception_regdump pstate = (struct exception_regdump )data;	109	struct exception_regdump pstate = (struct exception_regdump )data;
97	tlb_modified(pstate);	110	tlb_modified(pstate);
98	}	111	}
99		112
100	static void tlbinv_exception(int n, void *data)	113	static void tlbinv_exception(int n, void *data)
101	{	114	{
102	struct exception_regdump pstate = (struct exception_regdump )data;	115	struct exception_regdump pstate = (struct exception_regdump )data;
103	tlb_invalid(pstate);	116	tlb_invalid(pstate);
104	}	117	}
105		118
106	static void cpuns_exception(int n, void *data)	119	static void cpuns_exception(int n, void *data)
107	{	120	{
108	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)	121	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
109	scheduler_fpu_lazy_request();	122	scheduler_fpu_lazy_request();
110	else	123	else
111	panic("unhandled Coprocessor Unusable Exception\n");	124	panic("unhandled Coprocessor Unusable Exception\n");
112	}	125	}
113		126
114	static void interrupt_exception(int n, void *pstate)	127	static void interrupt_exception(int n, void *pstate)
115	{	128	{
116	__u32 cause;	129	__u32 cause;
117	int i;	130	int i;
118		131
119	/* decode interrupt number and process the interrupt */	132	/* decode interrupt number and process the interrupt */
120	cause = (cp0_cause_read() >> 8) &0xff;	133	cause = (cp0_cause_read() >> 8) &0xff;
121		134
122	for (i = 0; i < 8; i++)	135	for (i = 0; i < 8; i++)
123	if (cause & (1 << i))	136	if (cause & (1 << i))
124	exc_dispatch(i+INT_OFFSET, pstate);	137	exc_dispatch(i+INT_OFFSET, pstate);
125	}	138	}
126		139
127		140
128	void exception(struct exception_regdump *pstate)	141	void exception(struct exception_regdump *pstate)
129	{	142	{
130	int cause;	143	int cause;
131	int excno;	144	int excno;
132	__u32 epc_shift = 0;	145	__u32 epc_shift = 0;
133		146
134	ASSERT(CPU != NULL);	147	ASSERT(CPU != NULL);
135		148
136	/*	149	/*
137	* NOTE ON OPERATION ORDERING	150	* NOTE ON OPERATION ORDERING
138	*	151	*
139	* On entry, interrupts_disable() must be called before	152	* On entry, interrupts_disable() must be called before
140	* exception bit is cleared.	153	* exception bit is cleared.
141	*/	154	*/
142		155
143	interrupts_disable();	156	interrupts_disable();
144	cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit \|	157	cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit \|
145	cp0_status_um_bit));	158	cp0_status_um_bit));
146		159
147	/* Save pstate so that the threads can access it */	160	/* Save pstate so that the threads can access it */
148	/* If THREAD->pstate is set, this is nested exception,	161	/* If THREAD->pstate is set, this is nested exception,
149	* do not rewrite it	162	* do not rewrite it
150	*/	163	*/
151	if (THREAD && !THREAD->pstate)	164	if (THREAD && !THREAD->pstate)
152	THREAD->pstate = pstate;	165	THREAD->pstate = pstate;
153		166
154	cause = cp0_cause_read();	167	cause = cp0_cause_read();
155	excno = cp0_cause_excno(cause);	168	excno = cp0_cause_excno(cause);
156	/* Dispatch exception */	169	/* Dispatch exception */
157	exc_dispatch(excno, pstate);	170	exc_dispatch(excno, pstate);
158		171
159	/* Set to NULL, so that we can still support nested	172	/* Set to NULL, so that we can still support nested
160	* exceptions	173	* exceptions
161	* TODO: We should probably set EXL bit before this command,	174	* TODO: We should probably set EXL bit before this command,
162	* nesting. On the other hand, if some exception occurs between	175	* nesting. On the other hand, if some exception occurs between
163	* here and ERET, it won't set anything on the pstate anyway.	176	* here and ERET, it won't set anything on the pstate anyway.
164	*/	177	*/
165	if (THREAD)	178	if (THREAD)
166	THREAD->pstate = NULL;	179	THREAD->pstate = NULL;
167	}	180	}
168		181
169	void exception_init(void)	182	void exception_init(void)
170	{	183	{
171	int i;	184	int i;
172		185
173	/* Clear exception table */	186	/* Clear exception table */
174	for (i=0;i < IVT_ITEMS; i++)	187	for (i=0;i < IVT_ITEMS; i++)
175	exc_register(i, "undef", unhandled_exception);	188	exc_register(i, "undef", unhandled_exception);
176	exc_register(EXC_Bp, "bkpoint", breakpoint_exception);	189	exc_register(EXC_Bp, "bkpoint", breakpoint_exception);
177	exc_register(EXC_Mod, "tlb_mod", tlbmod_exception);	190	exc_register(EXC_Mod, "tlb_mod", tlbmod_exception);
178	exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception);	191	exc_register(EXC_TLBL, "tlbinvl", tlbinv_exception);
179	exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception);	192	exc_register(EXC_TLBS, "tlbinvl", tlbinv_exception);
180	exc_register(EXC_Int, "interrupt", interrupt_exception);	193	exc_register(EXC_Int, "interrupt", interrupt_exception);
181	#ifdef CONFIG_FPU_LAZY	194	#ifdef CONFIG_FPU_LAZY
182	exc_register(EXC_CpU, "cpunus", cpuns_exception);	195	exc_register(EXC_CpU, "cpunus", cpuns_exception);
183	#endif	196	#endif
184	}	197	}
185		198

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/mips32/src/exception.c @ 2071 – Rev 593 → 609