WebSVN – HelenOS – Diff – /branches/tracing/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.
 */
 
/** @addtogroup mips32 
 * @{
 */
/** @file
 */
 
#include <arch/exception.h>
#include <arch/interrupt.h>
#include <arch/mm/tlb.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 <ddi/irq.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 (*((uint32_t *)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)
{
    if (istate_from_uspace(istate)) {
        /* userspace breakpoint */
        udebug_breakpoint_event(0);
        return;
    }
 
#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)
{
    uint32_t 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)) {
            irq_t *irq = irq_dispatch_and_lock(i);
            if (irq) {
                /*
                 * The IRQ handler was found.
                 */
                irq->handler(irq, irq->arg);
                spinlock_unlock(&irq->lock);
            } else {
                /*
                 * Spurious interrupt.
                 */
#ifdef CONFIG_DEBUG
                printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, i);
#endif
            }
        }
    }
}
 
/** 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 2924	Rev 3424
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	/** @addtogroup mips32	29	/** @addtogroup mips32
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <arch/exception.h>	35	#include <arch/exception.h>
36	#include <arch/interrupt.h>	36	#include <arch/interrupt.h>
37	#include <arch/mm/tlb.h>	37	#include <arch/mm/tlb.h>
38	#include <panic.h>	38	#include <panic.h>
39	#include <arch/cp0.h>	39	#include <arch/cp0.h>
40	#include <arch/types.h>	40	#include <arch/types.h>
41	#include <arch.h>	41	#include <arch.h>
42	#include <debug.h>	42	#include <debug.h>
43	#include <proc/thread.h>	43	#include <proc/thread.h>
44	#include <symtab.h>	44	#include <symtab.h>
45	#include <print.h>	45	#include <print.h>
46	#include <interrupt.h>	46	#include <interrupt.h>
47	#include <func.h>	47	#include <func.h>
48	#include <console/kconsole.h>	48	#include <console/kconsole.h>
49	#include <ddi/irq.h>	49	#include <ddi/irq.h>
50	#include <arch/debugger.h>	50	#include <arch/debugger.h>
51		51
52	static char * exctable[] = {	52	static char * exctable[] = {
53	"Interrupt",	53	"Interrupt",
54	"TLB Modified",	54	"TLB Modified",
55	"TLB Invalid",	55	"TLB Invalid",
56	"TLB Invalid Store",	56	"TLB Invalid Store",
57	"Address Error - load/instr. fetch",	57	"Address Error - load/instr. fetch",
58	"Address Error - store",	58	"Address Error - store",
59	"Bus Error - fetch instruction",	59	"Bus Error - fetch instruction",
60	"Bus Error - data reference",	60	"Bus Error - data reference",
61	"Syscall",	61	"Syscall",
62	"BreakPoint",	62	"BreakPoint",
63	"Reserved Instruction",	63	"Reserved Instruction",
64	"Coprocessor Unusable",	64	"Coprocessor Unusable",
65	"Arithmetic Overflow",	65	"Arithmetic Overflow",
66	"Trap",	66	"Trap",
67	"Virtual Coherency - instruction",	67	"Virtual Coherency - instruction",
68	"Floating Point",	68	"Floating Point",
69	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	69	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
70	"WatchHi/WatchLo", /* 23 */	70	"WatchHi/WatchLo", /* 23 */
71	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	71	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
72	"Virtual Coherency - data",	72	"Virtual Coherency - data",
73	};	73	};
74		74
75	static void print_regdump(istate_t *istate)	75	static void print_regdump(istate_t *istate)
76	{	76	{
77	char *pcsymbol = "";	77	char *pcsymbol = "";
78	char *rasymbol = "";	78	char *rasymbol = "";
79		79
80	char *s = get_symtab_entry(istate->epc);	80	char *s = get_symtab_entry(istate->epc);
81	if (s)	81	if (s)
82	pcsymbol = s;	82	pcsymbol = s;
83	s = get_symtab_entry(istate->ra);	83	s = get_symtab_entry(istate->ra);
84	if (s)	84	if (s)
85	rasymbol = s;	85	rasymbol = s;
86		86
87	printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);	87	printf("PC: %#x(%s) RA: %#x(%s), SP(%p)\n", istate->epc, pcsymbol, istate->ra, rasymbol, istate->sp);
88	}	88	}
89		89
90	static void unhandled_exception(int n, istate_t *istate)	90	static void unhandled_exception(int n, istate_t *istate)
91	{	91	{
92	fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);	92	fault_if_from_uspace(istate, "unhandled exception %s", exctable[n]);
93		93
94	print_regdump(istate);	94	print_regdump(istate);
95	panic("unhandled exception %s\n", exctable[n]);	95	panic("unhandled exception %s\n", exctable[n]);
96	}	96	}
97		97
98	static void reserved_instr_exception(int n, istate_t *istate)	98	static void reserved_instr_exception(int n, istate_t *istate)
99	{	99	{
100	if (((uint32_t )istate->epc) == 0x7c03e83b) {	100	if (((uint32_t )istate->epc) == 0x7c03e83b) {
101	ASSERT(THREAD);	101	ASSERT(THREAD);
102	istate->epc += 4;	102	istate->epc += 4;
103	istate->v1 = istate->k1;	103	istate->v1 = istate->k1;
104	} else	104	} else
105	unhandled_exception(n, istate);	105	unhandled_exception(n, istate);
106	}	106	}
107		107
108	static void breakpoint_exception(int n, istate_t *istate)	108	static void breakpoint_exception(int n, istate_t *istate)
109	{	109	{
110	if (istate_from_uspace(istate)) {	110	if (istate_from_uspace(istate)) {
111	/* userspace breakpoint */	111	/* userspace breakpoint */
112	udebug_breakpoint_event(0);	112	udebug_breakpoint_event(0);
113	return;	113	return;
114	}	114	}
115		115
116	#ifdef CONFIG_DEBUG	116	#ifdef CONFIG_DEBUG
117	debugger_bpoint(istate);	117	debugger_bpoint(istate);
118	#else	118	#else
119	/* it is necessary to not re-execute BREAK instruction after	119	/* it is necessary to not re-execute BREAK instruction after
120	returning from Exception handler	120	returning from Exception handler
121	(see page 138 in R4000 Manual for more information) */	121	(see page 138 in R4000 Manual for more information) */
122	istate->epc += 4;	122	istate->epc += 4;
123	#endif	123	#endif
124	}	124	}
125		125
126	static void tlbmod_exception(int n, istate_t *istate)	126	static void tlbmod_exception(int n, istate_t *istate)
127	{	127	{
128	tlb_modified(istate);	128	tlb_modified(istate);
129	}	129	}
130		130
131	static void tlbinv_exception(int n, istate_t *istate)	131	static void tlbinv_exception(int n, istate_t *istate)
132	{	132	{
133	tlb_invalid(istate);	133	tlb_invalid(istate);
134	}	134	}
135		135
136	#ifdef CONFIG_FPU_LAZY	136	#ifdef CONFIG_FPU_LAZY
137	static void cpuns_exception(int n, istate_t *istate)	137	static void cpuns_exception(int n, istate_t *istate)
138	{	138	{
139	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)	139	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
140	scheduler_fpu_lazy_request();	140	scheduler_fpu_lazy_request();
141	else {	141	else {
142	fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");	142	fault_if_from_uspace(istate, "unhandled Coprocessor Unusable Exception");
143	panic("unhandled Coprocessor Unusable Exception\n");	143	panic("unhandled Coprocessor Unusable Exception\n");
144	}	144	}
145	}	145	}
146	#endif	146	#endif
147		147
148	static void interrupt_exception(int n, istate_t *istate)	148	static void interrupt_exception(int n, istate_t *istate)
149	{	149	{
150	uint32_t cause;	150	uint32_t cause;
151	int i;	151	int i;
152		152
153	/* decode interrupt number and process the interrupt */	153	/* decode interrupt number and process the interrupt */
154	cause = (cp0_cause_read() >> 8) &0xff;	154	cause = (cp0_cause_read() >> 8) &0xff;
155		155
156	for (i = 0; i < 8; i++) {	156	for (i = 0; i < 8; i++) {
157	if (cause & (1 << i)) {	157	if (cause & (1 << i)) {
158	irq_t *irq = irq_dispatch_and_lock(i);	158	irq_t *irq = irq_dispatch_and_lock(i);
159	if (irq) {	159	if (irq) {
160	/*	160	/*
161	* The IRQ handler was found.	161	* The IRQ handler was found.
162	*/	162	*/
163	irq->handler(irq, irq->arg);	163	irq->handler(irq, irq->arg);
164	spinlock_unlock(&irq->lock);	164	spinlock_unlock(&irq->lock);
165	} else {	165	} else {
166	/*	166	/*
167	* Spurious interrupt.	167	* Spurious interrupt.
168	*/	168	*/
169	#ifdef CONFIG_DEBUG	169	#ifdef CONFIG_DEBUG
170	printf("cpu%d: spurious interrupt (inum=%d)\n", CPU->id, i);	170	printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, i);
171	#endif	171	#endif
172	}	172	}
173	}	173	}
174	}	174	}
175	}	175	}
176		176
177	/** Handle syscall userspace call */	177	/** Handle syscall userspace call */
178	static void syscall_exception(int n, istate_t *istate)	178	static void syscall_exception(int n, istate_t *istate)
179	{	179	{
180	panic("Syscall is handled through shortcut");	180	panic("Syscall is handled through shortcut");
181	}	181	}
182		182
183	void exception_init(void)	183	void exception_init(void)
184	{	184	{
185	int i;	185	int i;
186		186
187	/* Clear exception table */	187	/* Clear exception table */
188	for (i = 0; i < IVT_ITEMS; i++)	188	for (i = 0; i < IVT_ITEMS; i++)
189	exc_register(i, "undef", (iroutine) unhandled_exception);	189	exc_register(i, "undef", (iroutine) unhandled_exception);
190		190
191	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);	191	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
192	exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);	192	exc_register(EXC_RI, "resinstr", (iroutine) reserved_instr_exception);
193	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);	193	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
194	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);	194	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
195	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);	195	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
196	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);	196	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
197	#ifdef CONFIG_FPU_LAZY	197	#ifdef CONFIG_FPU_LAZY
198	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);	198	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
199	#endif	199	#endif
200	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);	200	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
201	}	201	}
202		202
203	/** @}	203	/** @}
204	*/	204	*/
205		205

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(root)/branches/tracing/kernel/arch/mips32/src/exception.c @ 3683 – Rev 2924 → 3424