WebSVN – HelenOS – 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>
#include <syscall/syscall.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), SP(%P)\n",pstate->epc,pcsymbol,
           pstate->ra,rasymbol, pstate->sp);
}
 
static void unhandled_exception(int n, struct exception_regdump *pstate)
{
    print_regdump(pstate);
    panic("unhandled exception %s\n", exctable[n]);
}
 
static void breakpoint_exception(int n, struct exception_regdump *pstate)
{
#ifdef CONFIG_DEBUG
    debugger_bpoint(pstate);
#else
    /* 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;
#endif
}
 
static void tlbmod_exception(int n, struct exception_regdump *pstate)
{
    tlb_modified(pstate);
}
 
static void tlbinv_exception(int n, struct exception_regdump *pstate)
{
    tlb_invalid(pstate);
}
 
#ifdef CONFIG_FPU_LAZY
static void cpuns_exception(int n, struct exception_regdump *pstate)
{
    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, struct exception_regdump *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);
}
 
#include <debug.h>
/** Handle syscall userspace call */
static void syscall_exception(int n, struct exception_regdump *pstate)
{
    if (pstate->a3 < SYSCALL_END)
        pstate->v0 = syscall_table[pstate->a3](pstate->a0,
                               pstate->a1,
                               pstate->a2);
    else
        panic("Undefined syscall %d", pstate->a3);
    pstate->epc += 4;
}
 
 
void exception(struct exception_regdump *pstate)
{
    int cause;
    int excno;
 
    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", (iroutine) unhandled_exception);
    exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_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 799	Rev 852
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	#include <syscall/syscall.h>	43	#include <syscall/syscall.h>
44		44
45	static char * exctable[] = {	45	static char * exctable[] = {
46	"Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",	46	"Interrupt","TLB Modified","TLB Invalid","TLB Invalid Store",
47	"Address Error - load/instr. fetch",	47	"Address Error - load/instr. fetch",
48	"Address Error - store",	48	"Address Error - store",
49	"Bus Error - fetch instruction",	49	"Bus Error - fetch instruction",
50	"Bus Error - data reference",	50	"Bus Error - data reference",
51	"Syscall",	51	"Syscall",
52	"BreakPoint",	52	"BreakPoint",
53	"Reserved Instruction",	53	"Reserved Instruction",
54	"Coprocessor Unusable",	54	"Coprocessor Unusable",
55	"Arithmetic Overflow",	55	"Arithmetic Overflow",
56	"Trap",	56	"Trap",
57	"Virtual Coherency - instruction",	57	"Virtual Coherency - instruction",
58	"Floating Point",	58	"Floating Point",
59	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	59	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
60	"WatchHi/WatchLo", /* 23 */	60	"WatchHi/WatchLo", /* 23 */
61	NULL, NULL, NULL, NULL, NULL, NULL, NULL,	61	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
62	"Virtual Coherency - data",	62	"Virtual Coherency - data",
63	};	63	};
64		64
65	static void print_regdump(struct exception_regdump *pstate)	65	static void print_regdump(struct exception_regdump *pstate)
66	{	66	{
67	char *pcsymbol = "";	67	char *pcsymbol = "";
68	char *rasymbol = "";	68	char *rasymbol = "";
69		69
70	char *s = get_symtab_entry(pstate->epc);	70	char *s = get_symtab_entry(pstate->epc);
71	if (s)	71	if (s)
72	pcsymbol = s;	72	pcsymbol = s;
73	s = get_symtab_entry(pstate->ra);	73	s = get_symtab_entry(pstate->ra);
74	if (s)	74	if (s)
75	rasymbol = s;	75	rasymbol = s;
76		76
77	printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,	77	printf("PC: %X(%s) RA: %X(%s), SP(%P)\n",pstate->epc,pcsymbol,
78	pstate->ra,rasymbol);	78	pstate->ra,rasymbol, pstate->sp);
79	}	79	}
80		80
81	static void unhandled_exception(int n, struct exception_regdump *pstate)	81	static void unhandled_exception(int n, struct exception_regdump *pstate)
82	{	82	{
83	print_regdump(pstate);	83	print_regdump(pstate);
84	panic("unhandled exception %s\n", exctable[n]);	84	panic("unhandled exception %s\n", exctable[n]);
85	}	85	}
86		86
87	static void breakpoint_exception(int n, struct exception_regdump *pstate)	87	static void breakpoint_exception(int n, struct exception_regdump *pstate)
88	{	88	{
89	#ifdef CONFIG_DEBUG	89	#ifdef CONFIG_DEBUG
90	debugger_bpoint(pstate);	90	debugger_bpoint(pstate);
91	#else	91	#else
92	/* it is necessary to not re-execute BREAK instruction after	92	/* it is necessary to not re-execute BREAK instruction after
93	returning from Exception handler	93	returning from Exception handler
94	(see page 138 in R4000 Manual for more information) */	94	(see page 138 in R4000 Manual for more information) */
95	pstate->epc += 4;	95	pstate->epc += 4;
96	#endif	96	#endif
97	}	97	}
98		98
99	static void tlbmod_exception(int n, struct exception_regdump *pstate)	99	static void tlbmod_exception(int n, struct exception_regdump *pstate)
100	{	100	{
101	tlb_modified(pstate);	101	tlb_modified(pstate);
102	}	102	}
103		103
104	static void tlbinv_exception(int n, struct exception_regdump *pstate)	104	static void tlbinv_exception(int n, struct exception_regdump *pstate)
105	{	105	{
106	tlb_invalid(pstate);	106	tlb_invalid(pstate);
107	}	107	}
108		108
109	#ifdef CONFIG_FPU_LAZY	109	#ifdef CONFIG_FPU_LAZY
110	static void cpuns_exception(int n, struct exception_regdump *pstate)	110	static void cpuns_exception(int n, struct exception_regdump *pstate)
111	{	111	{
112	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)	112	if (cp0_cause_coperr(cp0_cause_read()) == fpu_cop_id)
113	scheduler_fpu_lazy_request();	113	scheduler_fpu_lazy_request();
114	else	114	else
115	panic("unhandled Coprocessor Unusable Exception\n");	115	panic("unhandled Coprocessor Unusable Exception\n");
116	}	116	}
117	#endif	117	#endif
118		118
119	static void interrupt_exception(int n, struct exception_regdump *pstate)	119	static void interrupt_exception(int n, struct exception_regdump *pstate)
120	{	120	{
121	__u32 cause;	121	__u32 cause;
122	int i;	122	int i;
123		123
124	/* decode interrupt number and process the interrupt */	124	/* decode interrupt number and process the interrupt */
125	cause = (cp0_cause_read() >> 8) &0xff;	125	cause = (cp0_cause_read() >> 8) &0xff;
126		126
127	for (i = 0; i < 8; i++)	127	for (i = 0; i < 8; i++)
128	if (cause & (1 << i))	128	if (cause & (1 << i))
129	exc_dispatch(i+INT_OFFSET, pstate);	129	exc_dispatch(i+INT_OFFSET, pstate);
130	}	130	}
131		131
132	#include <debug.h>	132	#include <debug.h>
133	/** Handle syscall userspace call */	133	/** Handle syscall userspace call */
134	static void syscall_exception(int n, struct exception_regdump *pstate)	134	static void syscall_exception(int n, struct exception_regdump *pstate)
135	{	135	{
136	if (pstate->a3 < SYSCALL_END)	136	if (pstate->a3 < SYSCALL_END)
137	pstate->v0 = syscall_table[pstate->a3](pstate->a0,	137	pstate->v0 = syscall_table[pstate->a3](pstate->a0,
138	pstate->a1,	138	pstate->a1,
139	pstate->a2);	139	pstate->a2);
140	else	140	else
141	panic("Undefined syscall %d", pstate->a3);	141	panic("Undefined syscall %d", pstate->a3);
142	pstate->epc += 4;	142	pstate->epc += 4;
143	}	143	}
144		144
145		145
146	void exception(struct exception_regdump *pstate)	146	void exception(struct exception_regdump *pstate)
147	{	147	{
148	int cause;	148	int cause;
149	int excno;	149	int excno;
150		150
151	ASSERT(CPU != NULL);	151	ASSERT(CPU != NULL);
152		152
153	/*	153	/*
154	* NOTE ON OPERATION ORDERING	154	* NOTE ON OPERATION ORDERING
155	*	155	*
156	* On entry, interrupts_disable() must be called before	156	* On entry, interrupts_disable() must be called before
157	* exception bit is cleared.	157	* exception bit is cleared.
158	*/	158	*/
159		159
160	interrupts_disable();	160	interrupts_disable();
161	cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit \|	161	cp0_status_write(cp0_status_read() & ~ (cp0_status_exl_exception_bit \|
162	cp0_status_um_bit));	162	cp0_status_um_bit));
163		163
164	/* Save pstate so that the threads can access it */	164	/* Save pstate so that the threads can access it */
165	/* If THREAD->pstate is set, this is nested exception,	165	/* If THREAD->pstate is set, this is nested exception,
166	* do not rewrite it	166	* do not rewrite it
167	*/	167	*/
168	if (THREAD && !THREAD->pstate)	168	if (THREAD && !THREAD->pstate)
169	THREAD->pstate = pstate;	169	THREAD->pstate = pstate;
170		170
171	cause = cp0_cause_read();	171	cause = cp0_cause_read();
172	excno = cp0_cause_excno(cause);	172	excno = cp0_cause_excno(cause);
173	/* Dispatch exception */	173	/* Dispatch exception */
174	exc_dispatch(excno, pstate);	174	exc_dispatch(excno, pstate);
175		175
176	/* Set to NULL, so that we can still support nested	176	/* Set to NULL, so that we can still support nested
177	* exceptions	177	* exceptions
178	* TODO: We should probably set EXL bit before this command,	178	* TODO: We should probably set EXL bit before this command,
179	* nesting. On the other hand, if some exception occurs between	179	* nesting. On the other hand, if some exception occurs between
180	* here and ERET, it won't set anything on the pstate anyway.	180	* here and ERET, it won't set anything on the pstate anyway.
181	*/	181	*/
182	if (THREAD)	182	if (THREAD)
183	THREAD->pstate = NULL;	183	THREAD->pstate = NULL;
184	}	184	}
185		185
186	void exception_init(void)	186	void exception_init(void)
187	{	187	{
188	int i;	188	int i;
189		189
190	/* Clear exception table */	190	/* Clear exception table */
191	for (i=0;i < IVT_ITEMS; i++)	191	for (i=0;i < IVT_ITEMS; i++)
192	exc_register(i, "undef", (iroutine) unhandled_exception);	192	exc_register(i, "undef", (iroutine) unhandled_exception);
193	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);	193	exc_register(EXC_Bp, "bkpoint", (iroutine) breakpoint_exception);
194	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);	194	exc_register(EXC_Mod, "tlb_mod", (iroutine) tlbmod_exception);
195	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);	195	exc_register(EXC_TLBL, "tlbinvl", (iroutine) tlbinv_exception);
196	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);	196	exc_register(EXC_TLBS, "tlbinvl", (iroutine) tlbinv_exception);
197	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);	197	exc_register(EXC_Int, "interrupt", (iroutine) interrupt_exception);
198	#ifdef CONFIG_FPU_LAZY	198	#ifdef CONFIG_FPU_LAZY
199	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);	199	exc_register(EXC_CpU, "cpunus", (iroutine) cpuns_exception);
200	#endif	200	#endif
201	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);	201	exc_register(EXC_Sys, "syscall", (iroutine) syscall_exception);
202	}	202	}
203		203

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(root)/kernel/trunk/arch/mips32/src/exception.c @ 852 – Rev 799 → 852