WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/mips32/src/debugger.c


/*
 * Copyright (C) 2005 Ondrej Palkovsky
 * 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 mips32debug
 * @{
 */
/** @file
 */
 
#include <arch/debugger.h>
#include <memstr.h>
#include <console/kconsole.h>
#include <console/cmd.h>
#include <symtab.h>
#include <print.h>
#include <panic.h>
#include <arch.h>
#include <arch/cp0.h>
#include <func.h>
 
bpinfo_t breakpoints[BKPOINTS_MAX];
SPINLOCK_INITIALIZE(bkpoint_lock);
 
static int cmd_print_breakpoints(cmd_arg_t *argv);
static cmd_info_t bkpts_info = {
    .name = "bkpts",
    .description = "Print breakpoint table.",
    .func = cmd_print_breakpoints,
    .argc = 0,
};
 
static int cmd_del_breakpoint(cmd_arg_t *argv);
static cmd_arg_t del_argv = {
    .type = ARG_TYPE_INT
};
static cmd_info_t delbkpt_info = {
    .name = "delbkpt",
    .description = "delbkpt <number> - Delete breakpoint.",
    .func = cmd_del_breakpoint,
    .argc = 1,
    .argv = &del_argv
};
 
static int cmd_add_breakpoint(cmd_arg_t *argv);
static cmd_arg_t add_argv = {
    .type = ARG_TYPE_INT
};
static cmd_info_t addbkpt_info = {
    .name = "addbkpt",
    .description = "addbkpt <&symbol> - new bkpoint. Break on J/Branch insts unsupported.",
    .func = cmd_add_breakpoint,
    .argc = 1,
    .argv = &add_argv
};
 
static cmd_arg_t adde_argv[] = {
    { .type = ARG_TYPE_INT },
    { .type = ARG_TYPE_INT }
};
static cmd_info_t addbkpte_info = {
    .name = "addbkpte",
    .description = "addebkpte <&symbol> <&func> - new bkpoint. Call func(or Nothing if 0).",
    .func = cmd_add_breakpoint,
    .argc = 2,
    .argv = adde_argv
};
 
static struct {
    uint32_t andmask;
    uint32_t value;
}jmpinstr[] = {
    {0xf3ff0000, 0x41000000}, /* BCzF */
    {0xf3ff0000, 0x41020000}, /* BCzFL */
    {0xf3ff0000, 0x41010000}, /* BCzT */
    {0xf3ff0000, 0x41030000}, /* BCzTL */
    {0xfc000000, 0x10000000}, /* BEQ */
    {0xfc000000, 0x50000000}, /* BEQL */
    {0xfc1f0000, 0x04010000}, /* BEQL */
    {0xfc1f0000, 0x04110000}, /* BGEZAL */
    {0xfc1f0000, 0x04130000}, /* BGEZALL */
    {0xfc1f0000, 0x04030000}, /* BGEZL */
    {0xfc1f0000, 0x1c000000}, /* BGTZ */
    {0xfc1f0000, 0x5c000000}, /* BGTZL */
    {0xfc1f0000, 0x18000000}, /* BLEZ */
    {0xfc1f0000, 0x58000000}, /* BLEZL */
    {0xfc1f0000, 0x04000000}, /* BLTZ */
    {0xfc1f0000, 0x04100000}, /* BLTZAL */
    {0xfc1f0000, 0x04120000}, /* BLTZALL */
    {0xfc1f0000, 0x04020000}, /* BLTZL */
    {0xfc000000, 0x14000000}, /* BNE */
    {0xfc000000, 0x54000000}, /* BNEL */
    {0xfc000000, 0x08000000}, /* J */
    {0xfc000000, 0x0c000000}, /* JAL */
    {0xfc1f07ff, 0x00000009}, /* JALR */
    {0,0} /* EndOfTable */
};
 
/** Test, if the given instruction is a jump or branch instruction
 *
 * @param instr Instruction code
 * @return true - it is jump instruction, false otherwise
 */
static bool is_jump(unative_t instr)
{
    int i;
 
    for (i=0;jmpinstr[i].andmask;i++) {
        if ((instr & jmpinstr[i].andmask) == jmpinstr[i].value)
            return true;
    }
 
    return false;
}
 
/** Add new breakpoint to table */
int cmd_add_breakpoint(cmd_arg_t *argv)
{
    bpinfo_t *cur = NULL;
    ipl_t ipl;
    int i;
 
    if (argv->intval & 0x3) {
        printf("Not aligned instruction, forgot to use &symbol?\n");
        return 1;
    }
    ipl = interrupts_disable();
    spinlock_lock(&bkpoint_lock);
 
    /* Check, that the breakpoints do not conflict */
    for (i=0; i<BKPOINTS_MAX; i++) {
        if (breakpoints[i].address == (uintptr_t)argv->intval) {
            printf("Duplicate breakpoint %d.\n", i);
            spinlock_unlock(&bkpoints_lock);
            return 0;
        } else if (breakpoints[i].address == (uintptr_t)argv->intval + sizeof(unative_t) || \
               breakpoints[i].address == (uintptr_t)argv->intval - sizeof(unative_t)) {
            printf("Adjacent breakpoints not supported, conflict with %d.\n", i);
            spinlock_unlock(&bkpoints_lock);
            return 0;
        }
           
    }
 
    for (i=0; i<BKPOINTS_MAX; i++)
        if (!breakpoints[i].address) {
            cur = &breakpoints[i];
            break;
        }
    if (!cur) {
        printf("Too many breakpoints.\n");
        spinlock_unlock(&bkpoint_lock);
        interrupts_restore(ipl);
        return 0;
    }
    cur->address = (uintptr_t) argv->intval;
    printf("Adding breakpoint on address: %p\n", argv->intval);
    cur->instruction = ((unative_t *)cur->address)[0];
    cur->nextinstruction = ((unative_t *)cur->address)[1];
    if (argv == &add_argv) {
        cur->flags = 0;
    } else { /* We are add extended */
        cur->flags = BKPOINT_FUNCCALL;
        cur->bkfunc =   (void (*)(void *, istate_t *)) argv[1].intval;
    }
    if (is_jump(cur->instruction))
        cur->flags |= BKPOINT_ONESHOT;
    cur->counter = 0;
 
    /* Set breakpoint */
    *((unative_t *)cur->address) = 0x0d;
 
    spinlock_unlock(&bkpoint_lock);
    interrupts_restore(ipl);
 
    return 1;
}
 
 
 
/** Remove breakpoint from table */
int cmd_del_breakpoint(cmd_arg_t *argv)
{
    bpinfo_t *cur;
    ipl_t ipl;
 
    if (argv->intval < 0 || argv->intval > BKPOINTS_MAX) {
        printf("Invalid breakpoint number.\n");
        return 0;
    }
    ipl = interrupts_disable();
    spinlock_lock(&bkpoint_lock);
 
    cur = &breakpoints[argv->intval];
    if (!cur->address) {
        printf("Breakpoint does not exist.\n");
        spinlock_unlock(&bkpoint_lock);
        interrupts_restore(ipl);
        return 0;
    }
    if ((cur->flags & BKPOINT_INPROG) && (cur->flags & BKPOINT_ONESHOT)) {
        printf("Cannot remove one-shot breakpoint in-progress\n");
        spinlock_unlock(&bkpoint_lock);
        interrupts_restore(ipl);
        return 0;
    }
    ((uint32_t *)cur->address)[0] = cur->instruction;
    ((uint32_t *)cur->address)[1] = cur->nextinstruction;
 
    cur->address = NULL;
 
    spinlock_unlock(&bkpoint_lock);
    interrupts_restore(ipl);
    return 1;
}
 
/** Print table of active breakpoints */
int cmd_print_breakpoints(cmd_arg_t *argv)
{
    int i;
    char *symbol;
 
    printf("Breakpoint table.\n");
    for (i=0; i < BKPOINTS_MAX; i++)
        if (breakpoints[i].address) {
            symbol = get_symtab_entry(breakpoints[i].address);
            printf("%d. %p in %s\n",i,
                   breakpoints[i].address, symbol);
            printf("     Count(%d) ", breakpoints[i].counter);
            if (breakpoints[i].flags & BKPOINT_INPROG)
                printf("INPROG ");
            if (breakpoints[i].flags & BKPOINT_ONESHOT)
                printf("ONESHOT ");
            if (breakpoints[i].flags & BKPOINT_FUNCCALL)
                printf("FUNCCALL ");
            printf("\n");
        }
    return 1;
}
 
/** Initialize debugger */
void debugger_init()
{
    int i;
 
    for (i=0; i<BKPOINTS_MAX; i++)
        breakpoints[i].address = NULL;
   
    cmd_initialize(&bkpts_info);
    if (!cmd_register(&bkpts_info))
        panic("could not register command %s\n", bkpts_info.name);
 
    cmd_initialize(&delbkpt_info);
    if (!cmd_register(&delbkpt_info))
        panic("could not register command %s\n", delbkpt_info.name);
 
    cmd_initialize(&addbkpt_info);
    if (!cmd_register(&addbkpt_info))
        panic("could not register command %s\n", addbkpt_info.name);
 
    cmd_initialize(&addbkpte_info);
    if (!cmd_register(&addbkpte_info))
        panic("could not register command %s\n", addbkpte_info.name);
}
 
/** Handle breakpoint
 *
 * Find breakpoint in breakpoint table.
 * If found, call kconsole, set break on next instruction and reexecute.
 * If we are on "next instruction", set it back on the first and reexecute.
 * If breakpoint not found in breakpoint table, call kconsole and start
 * next instruction.
 */
void debugger_bpoint(istate_t *istate)
{
    bpinfo_t *cur = NULL;
    uintptr_t fireaddr = istate->epc;
    int i;
 
    /* test branch delay slot */
    if (cp0_cause_read() & 0x80000000)
        panic("Breakpoint in branch delay slot not supported.\n");
 
    spinlock_lock(&bkpoint_lock);
    for (i=0; i<BKPOINTS_MAX; i++) {
        /* Normal breakpoint */
        if (fireaddr == breakpoints[i].address \
            && !(breakpoints[i].flags & BKPOINT_REINST)) {
            cur = &breakpoints[i];
            break;
        }
        /* Reinst only breakpoint */
        if ((breakpoints[i].flags & BKPOINT_REINST) \
            && (fireaddr ==breakpoints[i].address+sizeof(unative_t))) {
            cur = &breakpoints[i];
            break;
        }
    }
    if (cur) {
        if (cur->flags & BKPOINT_REINST) {
            /* Set breakpoint on first instruction */
            ((uint32_t *)cur->address)[0] = 0x0d;
            /* Return back the second */
            ((uint32_t *)cur->address)[1] = cur->nextinstruction;
            cur->flags &= ~BKPOINT_REINST;
            spinlock_unlock(&bkpoint_lock);
            return;
        }
        if (cur->flags & BKPOINT_INPROG)
            printf("Warning: breakpoint recursion\n");
       
        if (!(cur->flags & BKPOINT_FUNCCALL))
            printf("***Breakpoint %d: %p in %s.\n", i,
                   fireaddr, get_symtab_entry(istate->epc));
 
        /* Return first instruction back */
        ((uint32_t *)cur->address)[0] = cur->instruction;
 
        if (! (cur->flags & BKPOINT_ONESHOT)) {
            /* Set Breakpoint on next instruction */
            ((uint32_t *)cur->address)[1] = 0x0d;
            cur->flags |= BKPOINT_REINST;
        }
        cur->flags |= BKPOINT_INPROG;
    } else {
        printf("***Breakpoint %p in %s.\n", fireaddr,
               get_symtab_entry(fireaddr));
        /* Move on to next instruction */
        istate->epc += 4;
    }
    if (cur)
        cur->counter++;
    if (cur && (cur->flags & BKPOINT_FUNCCALL)) {
        /* Allow zero bkfunc, just for counting */
        if (cur->bkfunc)
            cur->bkfunc(cur, istate);
    } else {
        printf("***Type 'exit' to exit kconsole.\n");
        /* This disables all other processors - we are not SMP,
         * actually this gets us to cpu_halt, if scheduler() is run
         * - we generally do not want scheduler to be run from debug,
         *   so this is a good idea
         */
        atomic_set(&haltstate,1);
        spinlock_unlock(&bkpoint_lock);
 
        kconsole("debug");
 
        spinlock_lock(&bkpoint_lock);
        atomic_set(&haltstate,0);
    }
    if (cur && cur->address == fireaddr && (cur->flags & BKPOINT_INPROG)) {
        /* Remove one-shot breakpoint */
        if ((cur->flags & BKPOINT_ONESHOT))
            cur->address = NULL;
        /* Remove in-progress flag */
        cur->flags &= ~BKPOINT_INPROG;
    }
    spinlock_unlock(&bkpoint_lock);
}
 
 /** @}
 */
 
 

Rev 1705	Rev 1780
1	/*	1	/*
2	* Copyright (C) 2005 Ondrej Palkovsky	2	* Copyright (C) 2005 Ondrej Palkovsky
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 mips32debug	29	/** @addtogroup mips32debug
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <arch/debugger.h>	35	#include <arch/debugger.h>
36	#include <memstr.h>	36	#include <memstr.h>
37	#include <console/kconsole.h>	37	#include <console/kconsole.h>
38	#include <console/cmd.h>	38	#include <console/cmd.h>
39	#include <symtab.h>	39	#include <symtab.h>
40	#include <print.h>	40	#include <print.h>
41	#include <panic.h>	41	#include <panic.h>
42	#include <arch.h>	42	#include <arch.h>
43	#include <arch/cp0.h>	43	#include <arch/cp0.h>
44	#include <func.h>	44	#include <func.h>
45		45
46	bpinfo_t breakpoints[BKPOINTS_MAX];	46	bpinfo_t breakpoints[BKPOINTS_MAX];
47	SPINLOCK_INITIALIZE(bkpoint_lock);	47	SPINLOCK_INITIALIZE(bkpoint_lock);
48		48
49	static int cmd_print_breakpoints(cmd_arg_t *argv);	49	static int cmd_print_breakpoints(cmd_arg_t *argv);
50	static cmd_info_t bkpts_info = {	50	static cmd_info_t bkpts_info = {
51	.name = "bkpts",	51	.name = "bkpts",
52	.description = "Print breakpoint table.",	52	.description = "Print breakpoint table.",
53	.func = cmd_print_breakpoints,	53	.func = cmd_print_breakpoints,
54	.argc = 0,	54	.argc = 0,
55	};	55	};
56		56
57	static int cmd_del_breakpoint(cmd_arg_t *argv);	57	static int cmd_del_breakpoint(cmd_arg_t *argv);
58	static cmd_arg_t del_argv = {	58	static cmd_arg_t del_argv = {
59	.type = ARG_TYPE_INT	59	.type = ARG_TYPE_INT
60	};	60	};
61	static cmd_info_t delbkpt_info = {	61	static cmd_info_t delbkpt_info = {
62	.name = "delbkpt",	62	.name = "delbkpt",
63	.description = "delbkpt <number> - Delete breakpoint.",	63	.description = "delbkpt <number> - Delete breakpoint.",
64	.func = cmd_del_breakpoint,	64	.func = cmd_del_breakpoint,
65	.argc = 1,	65	.argc = 1,
66	.argv = &del_argv	66	.argv = &del_argv
67	};	67	};
68		68
69	static int cmd_add_breakpoint(cmd_arg_t *argv);	69	static int cmd_add_breakpoint(cmd_arg_t *argv);
70	static cmd_arg_t add_argv = {	70	static cmd_arg_t add_argv = {
71	.type = ARG_TYPE_INT	71	.type = ARG_TYPE_INT
72	};	72	};
73	static cmd_info_t addbkpt_info = {	73	static cmd_info_t addbkpt_info = {
74	.name = "addbkpt",	74	.name = "addbkpt",
75	.description = "addbkpt <&symbol> - new bkpoint. Break on J/Branch insts unsupported.",	75	.description = "addbkpt <&symbol> - new bkpoint. Break on J/Branch insts unsupported.",
76	.func = cmd_add_breakpoint,	76	.func = cmd_add_breakpoint,
77	.argc = 1,	77	.argc = 1,
78	.argv = &add_argv	78	.argv = &add_argv
79	};	79	};
80		80
81	static cmd_arg_t adde_argv[] = {	81	static cmd_arg_t adde_argv[] = {
82	{ .type = ARG_TYPE_INT },	82	{ .type = ARG_TYPE_INT },
83	{ .type = ARG_TYPE_INT }	83	{ .type = ARG_TYPE_INT }
84	};	84	};
85	static cmd_info_t addbkpte_info = {	85	static cmd_info_t addbkpte_info = {
86	.name = "addbkpte",	86	.name = "addbkpte",
87	.description = "addebkpte <&symbol> <&func> - new bkpoint. Call func(or Nothing if 0).",	87	.description = "addebkpte <&symbol> <&func> - new bkpoint. Call func(or Nothing if 0).",
88	.func = cmd_add_breakpoint,	88	.func = cmd_add_breakpoint,
89	.argc = 2,	89	.argc = 2,
90	.argv = adde_argv	90	.argv = adde_argv
91	};	91	};
92		92
93	static struct {	93	static struct {
94	__u32 andmask;	94	uint32_t andmask;
95	__u32 value;	95	uint32_t value;
96	}jmpinstr[] = {	96	}jmpinstr[] = {
97	{0xf3ff0000, 0x41000000}, /* BCzF */	97	{0xf3ff0000, 0x41000000}, /* BCzF */
98	{0xf3ff0000, 0x41020000}, /* BCzFL */	98	{0xf3ff0000, 0x41020000}, /* BCzFL */
99	{0xf3ff0000, 0x41010000}, /* BCzT */	99	{0xf3ff0000, 0x41010000}, /* BCzT */
100	{0xf3ff0000, 0x41030000}, /* BCzTL */	100	{0xf3ff0000, 0x41030000}, /* BCzTL */
101	{0xfc000000, 0x10000000}, /* BEQ */	101	{0xfc000000, 0x10000000}, /* BEQ */
102	{0xfc000000, 0x50000000}, /* BEQL */	102	{0xfc000000, 0x50000000}, /* BEQL */
103	{0xfc1f0000, 0x04010000}, /* BEQL */	103	{0xfc1f0000, 0x04010000}, /* BEQL */
104	{0xfc1f0000, 0x04110000}, /* BGEZAL */	104	{0xfc1f0000, 0x04110000}, /* BGEZAL */
105	{0xfc1f0000, 0x04130000}, /* BGEZALL */	105	{0xfc1f0000, 0x04130000}, /* BGEZALL */
106	{0xfc1f0000, 0x04030000}, /* BGEZL */	106	{0xfc1f0000, 0x04030000}, /* BGEZL */
107	{0xfc1f0000, 0x1c000000}, /* BGTZ */	107	{0xfc1f0000, 0x1c000000}, /* BGTZ */
108	{0xfc1f0000, 0x5c000000}, /* BGTZL */	108	{0xfc1f0000, 0x5c000000}, /* BGTZL */
109	{0xfc1f0000, 0x18000000}, /* BLEZ */	109	{0xfc1f0000, 0x18000000}, /* BLEZ */
110	{0xfc1f0000, 0x58000000}, /* BLEZL */	110	{0xfc1f0000, 0x58000000}, /* BLEZL */
111	{0xfc1f0000, 0x04000000}, /* BLTZ */	111	{0xfc1f0000, 0x04000000}, /* BLTZ */
112	{0xfc1f0000, 0x04100000}, /* BLTZAL */	112	{0xfc1f0000, 0x04100000}, /* BLTZAL */
113	{0xfc1f0000, 0x04120000}, /* BLTZALL */	113	{0xfc1f0000, 0x04120000}, /* BLTZALL */
114	{0xfc1f0000, 0x04020000}, /* BLTZL */	114	{0xfc1f0000, 0x04020000}, /* BLTZL */
115	{0xfc000000, 0x14000000}, /* BNE */	115	{0xfc000000, 0x14000000}, /* BNE */
116	{0xfc000000, 0x54000000}, /* BNEL */	116	{0xfc000000, 0x54000000}, /* BNEL */
117	{0xfc000000, 0x08000000}, /* J */	117	{0xfc000000, 0x08000000}, /* J */
118	{0xfc000000, 0x0c000000}, /* JAL */	118	{0xfc000000, 0x0c000000}, /* JAL */
119	{0xfc1f07ff, 0x00000009}, /* JALR */	119	{0xfc1f07ff, 0x00000009}, /* JALR */
120	{0,0} /* EndOfTable */	120	{0,0} /* EndOfTable */
121	};	121	};
122		122
123	/** Test, if the given instruction is a jump or branch instruction	123	/** Test, if the given instruction is a jump or branch instruction
124	*	124	*
125	* @param instr Instruction code	125	* @param instr Instruction code
126	* @return true - it is jump instruction, false otherwise	126	* @return true - it is jump instruction, false otherwise
127	*/	127	*/
128	static bool is_jump(__native instr)	128	static bool is_jump(unative_t instr)
129	{	129	{
130	int i;	130	int i;
131		131
132	for (i=0;jmpinstr[i].andmask;i++) {	132	for (i=0;jmpinstr[i].andmask;i++) {
133	if ((instr & jmpinstr[i].andmask) == jmpinstr[i].value)	133	if ((instr & jmpinstr[i].andmask) == jmpinstr[i].value)
134	return true;	134	return true;
135	}	135	}
136		136
137	return false;	137	return false;
138	}	138	}
139		139
140	/** Add new breakpoint to table */	140	/** Add new breakpoint to table */
141	int cmd_add_breakpoint(cmd_arg_t *argv)	141	int cmd_add_breakpoint(cmd_arg_t *argv)
142	{	142	{
143	bpinfo_t *cur = NULL;	143	bpinfo_t *cur = NULL;
144	ipl_t ipl;	144	ipl_t ipl;
145	int i;	145	int i;
146		146
147	if (argv->intval & 0x3) {	147	if (argv->intval & 0x3) {
148	printf("Not aligned instruction, forgot to use &symbol?\n");	148	printf("Not aligned instruction, forgot to use &symbol?\n");
149	return 1;	149	return 1;
150	}	150	}
151	ipl = interrupts_disable();	151	ipl = interrupts_disable();
152	spinlock_lock(&bkpoint_lock);	152	spinlock_lock(&bkpoint_lock);
153		153
154	/* Check, that the breakpoints do not conflict */	154	/* Check, that the breakpoints do not conflict */
155	for (i=0; i<BKPOINTS_MAX; i++) {	155	for (i=0; i<BKPOINTS_MAX; i++) {
156	if (breakpoints[i].address == (__address)argv->intval) {	156	if (breakpoints[i].address == (uintptr_t)argv->intval) {
157	printf("Duplicate breakpoint %d.\n", i);	157	printf("Duplicate breakpoint %d.\n", i);
158	spinlock_unlock(&bkpoints_lock);	158	spinlock_unlock(&bkpoints_lock);
159	return 0;	159	return 0;
160	} else if (breakpoints[i].address == (__address)argv->intval + sizeof(__native) \|\| \	160	} else if (breakpoints[i].address == (uintptr_t)argv->intval + sizeof(unative_t) \|\| \
161	breakpoints[i].address == (__address)argv->intval - sizeof(__native)) {	161	breakpoints[i].address == (uintptr_t)argv->intval - sizeof(unative_t)) {
162	printf("Adjacent breakpoints not supported, conflict with %d.\n", i);	162	printf("Adjacent breakpoints not supported, conflict with %d.\n", i);
163	spinlock_unlock(&bkpoints_lock);	163	spinlock_unlock(&bkpoints_lock);
164	return 0;	164	return 0;
165	}	165	}
166		166
167	}	167	}
168		168
169	for (i=0; i<BKPOINTS_MAX; i++)	169	for (i=0; i<BKPOINTS_MAX; i++)
170	if (!breakpoints[i].address) {	170	if (!breakpoints[i].address) {
171	cur = &breakpoints[i];	171	cur = &breakpoints[i];
172	break;	172	break;
173	}	173	}
174	if (!cur) {	174	if (!cur) {
175	printf("Too many breakpoints.\n");	175	printf("Too many breakpoints.\n");
176	spinlock_unlock(&bkpoint_lock);	176	spinlock_unlock(&bkpoint_lock);
177	interrupts_restore(ipl);	177	interrupts_restore(ipl);
178	return 0;	178	return 0;
179	}	179	}
180	cur->address = (__address) argv->intval;	180	cur->address = (uintptr_t) argv->intval;
181	printf("Adding breakpoint on address: %p\n", argv->intval);	181	printf("Adding breakpoint on address: %p\n", argv->intval);
182	cur->instruction = ((__native *)cur->address)[0];	182	cur->instruction = ((unative_t *)cur->address)[0];
183	cur->nextinstruction = ((__native *)cur->address)[1];	183	cur->nextinstruction = ((unative_t *)cur->address)[1];
184	if (argv == &add_argv) {	184	if (argv == &add_argv) {
185	cur->flags = 0;	185	cur->flags = 0;
186	} else { /* We are add extended */	186	} else { /* We are add extended */
187	cur->flags = BKPOINT_FUNCCALL;	187	cur->flags = BKPOINT_FUNCCALL;
188	cur->bkfunc = (void ()(void , istate_t *)) argv[1].intval;	188	cur->bkfunc = (void ()(void , istate_t *)) argv[1].intval;
189	}	189	}
190	if (is_jump(cur->instruction))	190	if (is_jump(cur->instruction))
191	cur->flags \|= BKPOINT_ONESHOT;	191	cur->flags \|= BKPOINT_ONESHOT;
192	cur->counter = 0;	192	cur->counter = 0;
193		193
194	/* Set breakpoint */	194	/* Set breakpoint */
195	((__native )cur->address) = 0x0d;	195	((unative_t )cur->address) = 0x0d;
196		196
197	spinlock_unlock(&bkpoint_lock);	197	spinlock_unlock(&bkpoint_lock);
198	interrupts_restore(ipl);	198	interrupts_restore(ipl);
199		199
200	return 1;	200	return 1;
201	}	201	}
202		202
203		203
204		204
205	/** Remove breakpoint from table */	205	/** Remove breakpoint from table */
206	int cmd_del_breakpoint(cmd_arg_t *argv)	206	int cmd_del_breakpoint(cmd_arg_t *argv)
207	{	207	{
208	bpinfo_t *cur;	208	bpinfo_t *cur;
209	ipl_t ipl;	209	ipl_t ipl;
210		210
211	if (argv->intval < 0 \|\| argv->intval > BKPOINTS_MAX) {	211	if (argv->intval < 0 \|\| argv->intval > BKPOINTS_MAX) {
212	printf("Invalid breakpoint number.\n");	212	printf("Invalid breakpoint number.\n");
213	return 0;	213	return 0;
214	}	214	}
215	ipl = interrupts_disable();	215	ipl = interrupts_disable();
216	spinlock_lock(&bkpoint_lock);	216	spinlock_lock(&bkpoint_lock);
217		217
218	cur = &breakpoints[argv->intval];	218	cur = &breakpoints[argv->intval];
219	if (!cur->address) {	219	if (!cur->address) {
220	printf("Breakpoint does not exist.\n");	220	printf("Breakpoint does not exist.\n");
221	spinlock_unlock(&bkpoint_lock);	221	spinlock_unlock(&bkpoint_lock);
222	interrupts_restore(ipl);	222	interrupts_restore(ipl);
223	return 0;	223	return 0;
224	}	224	}
225	if ((cur->flags & BKPOINT_INPROG) && (cur->flags & BKPOINT_ONESHOT)) {	225	if ((cur->flags & BKPOINT_INPROG) && (cur->flags & BKPOINT_ONESHOT)) {
226	printf("Cannot remove one-shot breakpoint in-progress\n");	226	printf("Cannot remove one-shot breakpoint in-progress\n");
227	spinlock_unlock(&bkpoint_lock);	227	spinlock_unlock(&bkpoint_lock);
228	interrupts_restore(ipl);	228	interrupts_restore(ipl);
229	return 0;	229	return 0;
230	}	230	}
231	((__u32 *)cur->address)[0] = cur->instruction;	231	((uint32_t *)cur->address)[0] = cur->instruction;
232	((__u32 *)cur->address)[1] = cur->nextinstruction;	232	((uint32_t *)cur->address)[1] = cur->nextinstruction;
233		233
234	cur->address = NULL;	234	cur->address = NULL;
235		235
236	spinlock_unlock(&bkpoint_lock);	236	spinlock_unlock(&bkpoint_lock);
237	interrupts_restore(ipl);	237	interrupts_restore(ipl);
238	return 1;	238	return 1;
239	}	239	}
240		240
241	/** Print table of active breakpoints */	241	/** Print table of active breakpoints */
242	int cmd_print_breakpoints(cmd_arg_t *argv)	242	int cmd_print_breakpoints(cmd_arg_t *argv)
243	{	243	{
244	int i;	244	int i;
245	char *symbol;	245	char *symbol;
246		246
247	printf("Breakpoint table.\n");	247	printf("Breakpoint table.\n");
248	for (i=0; i < BKPOINTS_MAX; i++)	248	for (i=0; i < BKPOINTS_MAX; i++)
249	if (breakpoints[i].address) {	249	if (breakpoints[i].address) {
250	symbol = get_symtab_entry(breakpoints[i].address);	250	symbol = get_symtab_entry(breakpoints[i].address);
251	printf("%d. %p in %s\n",i,	251	printf("%d. %p in %s\n",i,
252	breakpoints[i].address, symbol);	252	breakpoints[i].address, symbol);
253	printf(" Count(%d) ", breakpoints[i].counter);	253	printf(" Count(%d) ", breakpoints[i].counter);
254	if (breakpoints[i].flags & BKPOINT_INPROG)	254	if (breakpoints[i].flags & BKPOINT_INPROG)
255	printf("INPROG ");	255	printf("INPROG ");
256	if (breakpoints[i].flags & BKPOINT_ONESHOT)	256	if (breakpoints[i].flags & BKPOINT_ONESHOT)
257	printf("ONESHOT ");	257	printf("ONESHOT ");
258	if (breakpoints[i].flags & BKPOINT_FUNCCALL)	258	if (breakpoints[i].flags & BKPOINT_FUNCCALL)
259	printf("FUNCCALL ");	259	printf("FUNCCALL ");
260	printf("\n");	260	printf("\n");
261	}	261	}
262	return 1;	262	return 1;
263	}	263	}
264		264
265	/** Initialize debugger */	265	/** Initialize debugger */
266	void debugger_init()	266	void debugger_init()
267	{	267	{
268	int i;	268	int i;
269		269
270	for (i=0; i<BKPOINTS_MAX; i++)	270	for (i=0; i<BKPOINTS_MAX; i++)
271	breakpoints[i].address = NULL;	271	breakpoints[i].address = NULL;
272		272
273	cmd_initialize(&bkpts_info);	273	cmd_initialize(&bkpts_info);
274	if (!cmd_register(&bkpts_info))	274	if (!cmd_register(&bkpts_info))
275	panic("could not register command %s\n", bkpts_info.name);	275	panic("could not register command %s\n", bkpts_info.name);
276		276
277	cmd_initialize(&delbkpt_info);	277	cmd_initialize(&delbkpt_info);
278	if (!cmd_register(&delbkpt_info))	278	if (!cmd_register(&delbkpt_info))
279	panic("could not register command %s\n", delbkpt_info.name);	279	panic("could not register command %s\n", delbkpt_info.name);
280		280
281	cmd_initialize(&addbkpt_info);	281	cmd_initialize(&addbkpt_info);
282	if (!cmd_register(&addbkpt_info))	282	if (!cmd_register(&addbkpt_info))
283	panic("could not register command %s\n", addbkpt_info.name);	283	panic("could not register command %s\n", addbkpt_info.name);
284		284
285	cmd_initialize(&addbkpte_info);	285	cmd_initialize(&addbkpte_info);
286	if (!cmd_register(&addbkpte_info))	286	if (!cmd_register(&addbkpte_info))
287	panic("could not register command %s\n", addbkpte_info.name);	287	panic("could not register command %s\n", addbkpte_info.name);
288	}	288	}
289		289
290	/** Handle breakpoint	290	/** Handle breakpoint
291	*	291	*
292	* Find breakpoint in breakpoint table.	292	* Find breakpoint in breakpoint table.
293	* If found, call kconsole, set break on next instruction and reexecute.	293	* If found, call kconsole, set break on next instruction and reexecute.
294	* If we are on "next instruction", set it back on the first and reexecute.	294	* If we are on "next instruction", set it back on the first and reexecute.
295	* If breakpoint not found in breakpoint table, call kconsole and start	295	* If breakpoint not found in breakpoint table, call kconsole and start
296	* next instruction.	296	* next instruction.
297	*/	297	*/
298	void debugger_bpoint(istate_t *istate)	298	void debugger_bpoint(istate_t *istate)
299	{	299	{
300	bpinfo_t *cur = NULL;	300	bpinfo_t *cur = NULL;
301	__address fireaddr = istate->epc;	301	uintptr_t fireaddr = istate->epc;
302	int i;	302	int i;
303		303
304	/* test branch delay slot */	304	/* test branch delay slot */
305	if (cp0_cause_read() & 0x80000000)	305	if (cp0_cause_read() & 0x80000000)
306	panic("Breakpoint in branch delay slot not supported.\n");	306	panic("Breakpoint in branch delay slot not supported.\n");
307		307
308	spinlock_lock(&bkpoint_lock);	308	spinlock_lock(&bkpoint_lock);
309	for (i=0; i<BKPOINTS_MAX; i++) {	309	for (i=0; i<BKPOINTS_MAX; i++) {
310	/* Normal breakpoint */	310	/* Normal breakpoint */
311	if (fireaddr == breakpoints[i].address \	311	if (fireaddr == breakpoints[i].address \
312	&& !(breakpoints[i].flags & BKPOINT_REINST)) {	312	&& !(breakpoints[i].flags & BKPOINT_REINST)) {
313	cur = &breakpoints[i];	313	cur = &breakpoints[i];
314	break;	314	break;
315	}	315	}
316	/* Reinst only breakpoint */	316	/* Reinst only breakpoint */
317	if ((breakpoints[i].flags & BKPOINT_REINST) \	317	if ((breakpoints[i].flags & BKPOINT_REINST) \
318	&& (fireaddr ==breakpoints[i].address+sizeof(__native))) {	318	&& (fireaddr ==breakpoints[i].address+sizeof(unative_t))) {
319	cur = &breakpoints[i];	319	cur = &breakpoints[i];
320	break;	320	break;
321	}	321	}
322	}	322	}
323	if (cur) {	323	if (cur) {
324	if (cur->flags & BKPOINT_REINST) {	324	if (cur->flags & BKPOINT_REINST) {
325	/* Set breakpoint on first instruction */	325	/* Set breakpoint on first instruction */
326	((__u32 *)cur->address)[0] = 0x0d;	326	((uint32_t *)cur->address)[0] = 0x0d;
327	/* Return back the second */	327	/* Return back the second */
328	((__u32 *)cur->address)[1] = cur->nextinstruction;	328	((uint32_t *)cur->address)[1] = cur->nextinstruction;
329	cur->flags &= ~BKPOINT_REINST;	329	cur->flags &= ~BKPOINT_REINST;
330	spinlock_unlock(&bkpoint_lock);	330	spinlock_unlock(&bkpoint_lock);
331	return;	331	return;
332	}	332	}
333	if (cur->flags & BKPOINT_INPROG)	333	if (cur->flags & BKPOINT_INPROG)
334	printf("Warning: breakpoint recursion\n");	334	printf("Warning: breakpoint recursion\n");
335		335
336	if (!(cur->flags & BKPOINT_FUNCCALL))	336	if (!(cur->flags & BKPOINT_FUNCCALL))
337	printf("***Breakpoint %d: %p in %s.\n", i,	337	printf("***Breakpoint %d: %p in %s.\n", i,
338	fireaddr, get_symtab_entry(istate->epc));	338	fireaddr, get_symtab_entry(istate->epc));
339		339
340	/* Return first instruction back */	340	/* Return first instruction back */
341	((__u32 *)cur->address)[0] = cur->instruction;	341	((uint32_t *)cur->address)[0] = cur->instruction;
342		342
343	if (! (cur->flags & BKPOINT_ONESHOT)) {	343	if (! (cur->flags & BKPOINT_ONESHOT)) {
344	/* Set Breakpoint on next instruction */	344	/* Set Breakpoint on next instruction */
345	((__u32 *)cur->address)[1] = 0x0d;	345	((uint32_t *)cur->address)[1] = 0x0d;
346	cur->flags \|= BKPOINT_REINST;	346	cur->flags \|= BKPOINT_REINST;
347	}	347	}
348	cur->flags \|= BKPOINT_INPROG;	348	cur->flags \|= BKPOINT_INPROG;
349	} else {	349	} else {
350	printf("***Breakpoint %p in %s.\n", fireaddr,	350	printf("***Breakpoint %p in %s.\n", fireaddr,
351	get_symtab_entry(fireaddr));	351	get_symtab_entry(fireaddr));
352	/* Move on to next instruction */	352	/* Move on to next instruction */
353	istate->epc += 4;	353	istate->epc += 4;
354	}	354	}
355	if (cur)	355	if (cur)
356	cur->counter++;	356	cur->counter++;
357	if (cur && (cur->flags & BKPOINT_FUNCCALL)) {	357	if (cur && (cur->flags & BKPOINT_FUNCCALL)) {
358	/* Allow zero bkfunc, just for counting */	358	/* Allow zero bkfunc, just for counting */
359	if (cur->bkfunc)	359	if (cur->bkfunc)
360	cur->bkfunc(cur, istate);	360	cur->bkfunc(cur, istate);
361	} else {	361	} else {
362	printf("***Type 'exit' to exit kconsole.\n");	362	printf("***Type 'exit' to exit kconsole.\n");
363	/* This disables all other processors - we are not SMP,	363	/* This disables all other processors - we are not SMP,
364	* actually this gets us to cpu_halt, if scheduler() is run	364	* actually this gets us to cpu_halt, if scheduler() is run
365	* - we generally do not want scheduler to be run from debug,	365	* - we generally do not want scheduler to be run from debug,
366	* so this is a good idea	366	* so this is a good idea
367	*/	367	*/
368	atomic_set(&haltstate,1);	368	atomic_set(&haltstate,1);
369	spinlock_unlock(&bkpoint_lock);	369	spinlock_unlock(&bkpoint_lock);
370		370
371	kconsole("debug");	371	kconsole("debug");
372		372
373	spinlock_lock(&bkpoint_lock);	373	spinlock_lock(&bkpoint_lock);
374	atomic_set(&haltstate,0);	374	atomic_set(&haltstate,0);
375	}	375	}
376	if (cur && cur->address == fireaddr && (cur->flags & BKPOINT_INPROG)) {	376	if (cur && cur->address == fireaddr && (cur->flags & BKPOINT_INPROG)) {
377	/* Remove one-shot breakpoint */	377	/* Remove one-shot breakpoint */
378	if ((cur->flags & BKPOINT_ONESHOT))	378	if ((cur->flags & BKPOINT_ONESHOT))
379	cur->address = NULL;	379	cur->address = NULL;
380	/* Remove in-progress flag */	380	/* Remove in-progress flag */
381	cur->flags &= ~BKPOINT_INPROG;	381	cur->flags &= ~BKPOINT_INPROG;
382	}	382	}
383	spinlock_unlock(&bkpoint_lock);	383	spinlock_unlock(&bkpoint_lock);
384	}	384	}
385		385
386	/** @}	386	/** @}
387	*/	387	*/
388		388
389		389

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(root)/kernel/trunk/arch/mips32/src/debugger.c – Rev 1705 → 1780