WebSVN – HelenOS – Diff – /trunk/kernel/arch/amd64/src/debugger.c


/*
 * Copyright (c) 2006 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 amd64debug
 * @{
 */
/** @file
 */
 
#include <arch/debugger.h>
#include <console/kconsole.h>
#include <console/cmd.h>
#include <symtab.h>
#include <print.h>
#include <panic.h>
#include <interrupt.h>
#include <arch/asm.h>
#include <arch/cpu.h>
#include <debug.h>
#include <func.h>
#include <smp/ipi.h>
 
typedef struct  {
    uintptr_t address;      /**< Breakpoint address */
    int flags;              /**< Flags regarding breakpoint */
    int counter;            /**< How many times the exception occured */
} bpinfo_t;
 
static 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,
};
 
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
 
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 breakpoint.",
    .func = cmd_add_breakpoint,
    .argc = 1,
    .argv = &add_argv
};
 
static cmd_arg_t addw_argv = {
    .type = ARG_TYPE_INT
};
static cmd_info_t addwatchp_info = {
    .name = "addwatchp",
    .description = "addbwatchp <&symbol> - new write watchpoint.",
    .func = cmd_add_breakpoint,
    .argc = 1,
    .argv = &addw_argv
};
 
#endif
 
/** Print table of active breakpoints */
int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))
{
    unsigned int i;
    char *symbol;
 
#ifdef __32_BITS__  
    printf("#  Count Address    In symbol\n");
    printf("-- ----- ---------- ---------\n");
#endif
 
#ifdef __64_BITS__
    printf("#  Count Address            In symbol\n");
    printf("-- ----- ------------------ ---------\n");
#endif
   
    for (i = 0; i < BKPOINTS_MAX; i++)
        if (breakpoints[i].address) {
            symbol = get_symtab_entry(breakpoints[i].address);
 
#ifdef __32_BITS__
            printf("%-2u %-5d %#10zx %s\n", i,
                breakpoints[i].counter, breakpoints[i].address,
                symbol);
#endif
 
#ifdef __64_BITS__
            printf("%-2u %-5d %#18zx %s\n", i,
                breakpoints[i].counter, breakpoints[i].address,
                symbol);
#endif
 
        }
    return 1;
}
 
/* Setup DR register according to table */
static void setup_dr(int curidx)
{
    unative_t dr7;
    bpinfo_t *cur = &breakpoints[curidx];
    int flags = breakpoints[curidx].flags;
 
    /* Disable breakpoint in DR7 */
    dr7 = read_dr7();
    dr7 &= ~(0x2 << (curidx*2));
 
    if (cur->address) { /* Setup DR register */
        /* Set breakpoint to debug registers */
        switch (curidx) {
        case 0:
            write_dr0(cur->address);
            break;
        case 1:
            write_dr1(cur->address);
            break;
        case 2:
            write_dr2(cur->address);
            break;
        case 3:
            write_dr3(cur->address);
            break;
        }
        /* Set type to requested breakpoint & length*/
        dr7 &= ~ (0x3 << (16 + 4*curidx));
        dr7 &= ~ (0x3 << (18 + 4*curidx));
        if ((flags & BKPOINT_INSTR)) {
            ;
        } else {
       
#ifdef __32_BITS__
            dr7 |= ((unative_t) 0x3) << (18 + 4 * curidx);
#endif
 
#ifdef __64_BITS__
            dr7 |= ((unative_t) 0x2) << (18 + 4 * curidx);
#endif
           
            if ((flags & BKPOINT_WRITE))
                dr7 |= ((unative_t) 0x1) << (16 + 4 * curidx);
            else if ((flags & BKPOINT_READ_WRITE))
                dr7 |= ((unative_t) 0x3) << (16 + 4 * curidx);
        }
 
        /* Enable global breakpoint */
        dr7 |= 0x2 << (curidx * 2);
 
        write_dr7(dr7);
       
    }
}
   
/** Enable hardware breakpoint
 *
 * @param where Address of HW breakpoint
 * @param flags Type of breakpoint (EXECUTE, WRITE)
 * @return Debug slot on success, -1 - no available HW breakpoint
 */
int breakpoint_add(const void *where, const int flags, int curidx)
{
    ipl_t ipl;
    int i;
    bpinfo_t *cur;
 
    ASSERT(flags & (BKPOINT_INSTR | BKPOINT_WRITE | BKPOINT_READ_WRITE));
 
    ipl = interrupts_disable();
    spinlock_lock(&bkpoint_lock);
   
    if (curidx == -1) {
        /* Find free space in slots */
        for (i = 0; i < BKPOINTS_MAX; i++)
            if (!breakpoints[i].address) {
                curidx = i;
                break;
            }
        if (curidx == -1) {
            /* Too many breakpoints */
            spinlock_unlock(&bkpoint_lock);
            interrupts_restore(ipl);
            return -1;
        }
    }
    cur = &breakpoints[curidx];
 
    cur->address = (uintptr_t) where;
    cur->flags = flags;
    cur->counter = 0;
 
    setup_dr(curidx);
 
    spinlock_unlock(&bkpoint_lock);
    interrupts_restore(ipl);
 
    /* Send IPI */
#ifdef CONFIG_SMP
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
#endif  
 
    return curidx;
}
 
#ifdef amd64
#   define getip(x) ((x)->rip)
#else
#   define getip(x) ((x)->eip)
#endif
 
static void handle_exception(int slot, istate_t *istate)
{
    ASSERT(breakpoints[slot].address);
 
    /* Handle zero checker */
    if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
        if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
            if (*((unative_t *) breakpoints[slot].address) != 0)
                return;
            printf("*** Found ZERO on address %lx (slot %d) ***\n",
                breakpoints[slot].address, slot);
        } else {
            printf("Data watchpoint - new data: %lx\n",
                *((unative_t *) breakpoints[slot].address));
        }
    }
    printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
        get_symtab_entry(getip(istate)));
    printf("***Type 'exit' to exit kconsole.\n");
    atomic_set(&haltstate,1);
    kconsole((void *) "debug");
    atomic_set(&haltstate,0);
}
 
void breakpoint_del(int slot)
{
    bpinfo_t *cur;
    ipl_t ipl;
 
    ipl = interrupts_disable();
    spinlock_lock(&bkpoint_lock);
 
    cur = &breakpoints[slot];
    if (!cur->address) {
        spinlock_unlock(&bkpoint_lock);
        interrupts_restore(ipl);
        return;
    }
 
    cur->address = NULL;
 
    setup_dr(slot);
 
    spinlock_unlock(&bkpoint_lock);
    interrupts_restore(ipl);
#ifdef CONFIG_SMP
//  ipi_broadcast(VECTOR_DEBUG_IPI);    
#endif
}
 
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
 
/** Remove breakpoint from table */
int cmd_del_breakpoint(cmd_arg_t *argv)
{
    unative_t bpno = argv->intval;
    if (bpno > BKPOINTS_MAX) {
        printf("Invalid breakpoint number.\n");
        return 0;
    }
    breakpoint_del(argv->intval);
    return 1;
}
 
/** Add new breakpoint to table */
static int cmd_add_breakpoint(cmd_arg_t *argv)
{
    int flags;
    int id;
 
    if (argv == &add_argv) {
        flags = BKPOINT_INSTR;
    } else { /* addwatchp */
        flags = BKPOINT_WRITE;
    }
    printf("Adding breakpoint on address: %p\n", argv->intval);
    id = breakpoint_add((void *)argv->intval, flags, -1);
    if (id < 0)
        printf("Add breakpoint failed.\n");
    else
        printf("Added breakpoint %d.\n", id);
   
    return 1;
}
#endif
 
static void debug_exception(int n __attribute__((unused)), istate_t *istate)
{
    unative_t dr6;
    int i;
   
    /* Set RF to restart the instruction  */
#ifdef amd64       
    istate->rflags |= RFLAGS_RF;
#else
    istate->eflags |= EFLAGS_RF;
#endif
 
    dr6 = read_dr6();
    for (i=0; i < BKPOINTS_MAX; i++) {
        if (dr6 & (1 << i)) {
            dr6 &= ~ (1 << i);
            write_dr6(dr6);
           
            handle_exception(i, istate);
        }
    }
}
 
#ifdef CONFIG_SMP
static void
debug_ipi(int n __attribute__((unused)),
    istate_t *istate __attribute__((unused)))
{
    int i;
 
    spinlock_lock(&bkpoint_lock);
    for (i = 0; i < BKPOINTS_MAX; i++)
        setup_dr(i);
    spinlock_unlock(&bkpoint_lock);
}
#endif
 
/** 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);
 
#ifndef CONFIG_DEBUG_AS_WATCHPOINT
    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(&addwatchp_info);
    if (!cmd_register(&addwatchp_info))
        panic("could not register command %s\n", addwatchp_info.name);
#endif
   
    exc_register(VECTOR_DEBUG, "debugger", debug_exception);
 
#ifdef CONFIG_SMP
    exc_register(VECTOR_DEBUG_IPI, "debugger_smp", debug_ipi);
 
#endif
}
 
/** @}
 */
 

Rev 3071	Rev 3138
1	/*	1	/*
2	* Copyright (c) 2006 Ondrej Palkovsky	2	* Copyright (c) 2006 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 amd64debug	29	/** @addtogroup amd64debug
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <arch/debugger.h>	35	#include <arch/debugger.h>
36	#include <console/kconsole.h>	36	#include <console/kconsole.h>
37	#include <console/cmd.h>	37	#include <console/cmd.h>
38	#include <symtab.h>	38	#include <symtab.h>
39	#include <print.h>	39	#include <print.h>
40	#include <panic.h>	40	#include <panic.h>
41	#include <interrupt.h>	41	#include <interrupt.h>
42	#include <arch/asm.h>	42	#include <arch/asm.h>
43	#include <arch/cpu.h>	43	#include <arch/cpu.h>
44	#include <debug.h>	44	#include <debug.h>
45	#include <func.h>	45	#include <func.h>
46	#include <smp/ipi.h>	46	#include <smp/ipi.h>
47		47
48	typedef struct {	48	typedef struct {
49	uintptr_t address; /*< Breakpoint address /	49	uintptr_t address; /*< Breakpoint address /
50	int flags; /*< Flags regarding breakpoint /	50	int flags; /*< Flags regarding breakpoint /
51	int counter; /*< How many times the exception occured /	51	int counter; /*< How many times the exception occured /
52	} bpinfo_t;	52	} bpinfo_t;
53		53
54	static bpinfo_t breakpoints[BKPOINTS_MAX];	54	static bpinfo_t breakpoints[BKPOINTS_MAX];
55	SPINLOCK_INITIALIZE(bkpoint_lock);	55	SPINLOCK_INITIALIZE(bkpoint_lock);
56		56
57	static int cmd_print_breakpoints(cmd_arg_t *argv);	57	static int cmd_print_breakpoints(cmd_arg_t *argv);
58	static cmd_info_t bkpts_info = {	58	static cmd_info_t bkpts_info = {
59	.name = "bkpts",	59	.name = "bkpts",
60	.description = "Print breakpoint table.",	60	.description = "Print breakpoint table.",
61	.func = cmd_print_breakpoints,	61	.func = cmd_print_breakpoints,
62	.argc = 0,	62	.argc = 0,
63	};	63	};
64		64
65	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	65	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
66		66
67	static int cmd_del_breakpoint(cmd_arg_t *argv);	67	static int cmd_del_breakpoint(cmd_arg_t *argv);
68	static cmd_arg_t del_argv = {	68	static cmd_arg_t del_argv = {
69	.type = ARG_TYPE_INT	69	.type = ARG_TYPE_INT
70	};	70	};
71	static cmd_info_t delbkpt_info = {	71	static cmd_info_t delbkpt_info = {
72	.name = "delbkpt",	72	.name = "delbkpt",
73	.description = "delbkpt <number> - Delete breakpoint.",	73	.description = "delbkpt <number> - Delete breakpoint.",
74	.func = cmd_del_breakpoint,	74	.func = cmd_del_breakpoint,
75	.argc = 1,	75	.argc = 1,
76	.argv = &del_argv	76	.argv = &del_argv
77	};	77	};
78		78
79	static int cmd_add_breakpoint(cmd_arg_t *argv);	79	static int cmd_add_breakpoint(cmd_arg_t *argv);
80	static cmd_arg_t add_argv = {	80	static cmd_arg_t add_argv = {
81	.type = ARG_TYPE_INT	81	.type = ARG_TYPE_INT
82	};	82	};
83	static cmd_info_t addbkpt_info = {	83	static cmd_info_t addbkpt_info = {
84	.name = "addbkpt",	84	.name = "addbkpt",
85	.description = "addbkpt <&symbol> - new breakpoint.",	85	.description = "addbkpt <&symbol> - new breakpoint.",
86	.func = cmd_add_breakpoint,	86	.func = cmd_add_breakpoint,
87	.argc = 1,	87	.argc = 1,
88	.argv = &add_argv	88	.argv = &add_argv
89	};	89	};
90		90
91	static cmd_arg_t addw_argv = {	91	static cmd_arg_t addw_argv = {
92	.type = ARG_TYPE_INT	92	.type = ARG_TYPE_INT
93	};	93	};
94	static cmd_info_t addwatchp_info = {	94	static cmd_info_t addwatchp_info = {
95	.name = "addwatchp",	95	.name = "addwatchp",
96	.description = "addbwatchp <&symbol> - new write watchpoint.",	96	.description = "addbwatchp <&symbol> - new write watchpoint.",
97	.func = cmd_add_breakpoint,	97	.func = cmd_add_breakpoint,
98	.argc = 1,	98	.argc = 1,
99	.argv = &addw_argv	99	.argv = &addw_argv
100	};	100	};
101		101
102	#endif	102	#endif
103		103
104	/** Print table of active breakpoints */	104	/** Print table of active breakpoints */
105	int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))	105	int cmd_print_breakpoints(cmd_arg_t *argv __attribute__((unused)))
106	{	106	{
107	unsigned int i;	107	unsigned int i;
108	char *symbol;	108	char *symbol;
109		109
110	#ifdef __32_BITS__	110	#ifdef __32_BITS__
111	printf("# Count Address In symbol\n");	111	printf("# Count Address In symbol\n");
112	printf("-- ----- ---------- ---------\n");	112	printf("-- ----- ---------- ---------\n");
113	#endif	113	#endif
114		114
115	#ifdef __64_BITS__	115	#ifdef __64_BITS__
116	printf("# Count Address In symbol\n");	116	printf("# Count Address In symbol\n");
117	printf("-- ----- ------------------ ---------\n");	117	printf("-- ----- ------------------ ---------\n");
118	#endif	118	#endif
119		119
120	for (i = 0; i < BKPOINTS_MAX; i++)	120	for (i = 0; i < BKPOINTS_MAX; i++)
121	if (breakpoints[i].address) {	121	if (breakpoints[i].address) {
122	symbol = get_symtab_entry(breakpoints[i].address);	122	symbol = get_symtab_entry(breakpoints[i].address);
123		123
124	#ifdef __32_BITS__	124	#ifdef __32_BITS__
125	printf("%-2u %-5d %#10zx %s\n", i, breakpoints[i].counter,	125	printf("%-2u %-5d %#10zx %s\n", i,
126	breakpoints[i].address, symbol);	126	breakpoints[i].counter, breakpoints[i].address,
-		127	symbol);
127	#endif	128	#endif
128		129
129	#ifdef __64_BITS__	130	#ifdef __64_BITS__
130	printf("%-2u %-5d %#18zx %s\n", i, breakpoints[i].counter,	131	printf("%-2u %-5d %#18zx %s\n", i,
131	breakpoints[i].address, symbol);	132	breakpoints[i].counter, breakpoints[i].address,
-		133	symbol);
132	#endif	134	#endif
133		135
134	}	136	}
135	return 1;	137	return 1;
136	}	138	}
137		139
138	/* Setup DR register according to table */	140	/* Setup DR register according to table */
139	static void setup_dr(int curidx)	141	static void setup_dr(int curidx)
140	{	142	{
141	unative_t dr7;	143	unative_t dr7;
142	bpinfo_t *cur = &breakpoints[curidx];	144	bpinfo_t *cur = &breakpoints[curidx];
143	int flags = breakpoints[curidx].flags;	145	int flags = breakpoints[curidx].flags;
144		146
145	/* Disable breakpoint in DR7 */	147	/* Disable breakpoint in DR7 */
146	dr7 = read_dr7();	148	dr7 = read_dr7();
147	dr7 &= ~(0x2 << (curidx*2));	149	dr7 &= ~(0x2 << (curidx*2));
148		150
149	if (cur->address) { /* Setup DR register */	151	if (cur->address) { /* Setup DR register */
150	/* Set breakpoint to debug registers */	152	/* Set breakpoint to debug registers */
151	switch (curidx) {	153	switch (curidx) {
152	case 0:	154	case 0:
153	write_dr0(cur->address);	155	write_dr0(cur->address);
154	break;	156	break;
155	case 1:	157	case 1:
156	write_dr1(cur->address);	158	write_dr1(cur->address);
157	break;	159	break;
158	case 2:	160	case 2:
159	write_dr2(cur->address);	161	write_dr2(cur->address);
160	break;	162	break;
161	case 3:	163	case 3:
162	write_dr3(cur->address);	164	write_dr3(cur->address);
163	break;	165	break;
164	}	166	}
165	/* Set type to requested breakpoint & length*/	167	/* Set type to requested breakpoint & length*/
166	dr7 &= ~ (0x3 << (16 + 4*curidx));	168	dr7 &= ~ (0x3 << (16 + 4*curidx));
167	dr7 &= ~ (0x3 << (18 + 4*curidx));	169	dr7 &= ~ (0x3 << (18 + 4*curidx));
168	if ((flags & BKPOINT_INSTR)) {	170	if ((flags & BKPOINT_INSTR)) {
169	;	171	;
170	} else {	172	} else {
171		173
172	#ifdef __32_BITS__	174	#ifdef __32_BITS__
173	dr7 \|= ((unative_t) 0x3) << (18 + 4 * curidx);	175	dr7 \|= ((unative_t) 0x3) << (18 + 4 * curidx);
174	#endif	176	#endif
175		177
176	#ifdef __64_BITS__	178	#ifdef __64_BITS__
177	dr7 \|= ((unative_t) 0x2) << (18 + 4 * curidx);	179	dr7 \|= ((unative_t) 0x2) << (18 + 4 * curidx);
178	#endif	180	#endif
179		181
180	if ((flags & BKPOINT_WRITE))	182	if ((flags & BKPOINT_WRITE))
181	dr7 \|= ((unative_t) 0x1) << (16 + 4 * curidx);	183	dr7 \|= ((unative_t) 0x1) << (16 + 4 * curidx);
182	else if ((flags & BKPOINT_READ_WRITE))	184	else if ((flags & BKPOINT_READ_WRITE))
183	dr7 \|= ((unative_t) 0x3) << (16 + 4 * curidx);	185	dr7 \|= ((unative_t) 0x3) << (16 + 4 * curidx);
184	}	186	}
185		187
186	/* Enable global breakpoint */	188	/* Enable global breakpoint */
187	dr7 \|= 0x2 << (curidx*2);	189	dr7 \|= 0x2 << (curidx * 2);
188		190
189	write_dr7(dr7);	191	write_dr7(dr7);
190		192
191	}	193	}
192	}	194	}
193		195
194	/** Enable hardware breakpoint	196	/** Enable hardware breakpoint
195	*	197	*
196	* @param where Address of HW breakpoint	198	* @param where Address of HW breakpoint
197	* @param flags Type of breakpoint (EXECUTE, WRITE)	199	* @param flags Type of breakpoint (EXECUTE, WRITE)
198	* @return Debug slot on success, -1 - no available HW breakpoint	200	* @return Debug slot on success, -1 - no available HW breakpoint
199	*/	201	*/
200	int breakpoint_add(const void *where, const int flags, int curidx)	202	int breakpoint_add(const void *where, const int flags, int curidx)
201	{	203	{
202	ipl_t ipl;	204	ipl_t ipl;
203	int i;	205	int i;
204	bpinfo_t *cur;	206	bpinfo_t *cur;
205		207
206	ASSERT(flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));	208	ASSERT(flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));
207		209
208	ipl = interrupts_disable();	210	ipl = interrupts_disable();
209	spinlock_lock(&bkpoint_lock);	211	spinlock_lock(&bkpoint_lock);
210		212
211	if (curidx == -1) {	213	if (curidx == -1) {
212	/* Find free space in slots */	214	/* Find free space in slots */
213	for (i = 0; i < BKPOINTS_MAX; i++)	215	for (i = 0; i < BKPOINTS_MAX; i++)
214	if (!breakpoints[i].address) {	216	if (!breakpoints[i].address) {
215	curidx = i;	217	curidx = i;
216	break;	218	break;
217	}	219	}
218	if (curidx == -1) {	220	if (curidx == -1) {
219	/* Too many breakpoints */	221	/* Too many breakpoints */
220	spinlock_unlock(&bkpoint_lock);	222	spinlock_unlock(&bkpoint_lock);
221	interrupts_restore(ipl);	223	interrupts_restore(ipl);
222	return -1;	224	return -1;
223	}	225	}
224	}	226	}
225	cur = &breakpoints[curidx];	227	cur = &breakpoints[curidx];
226		228
227	cur->address = (uintptr_t) where;	229	cur->address = (uintptr_t) where;
228	cur->flags = flags;	230	cur->flags = flags;
229	cur->counter = 0;	231	cur->counter = 0;
230		232
231	setup_dr(curidx);	233	setup_dr(curidx);
232		234
233	spinlock_unlock(&bkpoint_lock);	235	spinlock_unlock(&bkpoint_lock);
234	interrupts_restore(ipl);	236	interrupts_restore(ipl);
235		237
236	/* Send IPI */	238	/* Send IPI */
237	#ifdef CONFIG_SMP	239	#ifdef CONFIG_SMP
238	// ipi_broadcast(VECTOR_DEBUG_IPI);	240	// ipi_broadcast(VECTOR_DEBUG_IPI);
239	#endif	241	#endif
240		242
241	return curidx;	243	return curidx;
242	}	244	}
243		245
244	#ifdef amd64	246	#ifdef amd64
245	# define getip(x) ((x)->rip)	247	# define getip(x) ((x)->rip)
246	#else	248	#else
247	# define getip(x) ((x)->eip)	249	# define getip(x) ((x)->eip)
248	#endif	250	#endif
249		251
250	static void handle_exception(int slot, istate_t *istate)	252	static void handle_exception(int slot, istate_t *istate)
251	{	253	{
252	ASSERT(breakpoints[slot].address);	254	ASSERT(breakpoints[slot].address);
253		255
254	/* Handle zero checker */	256	/* Handle zero checker */
255	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {	257	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
256	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {	258	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
257	if (((unative_t ) breakpoints[slot].address) != 0)	259	if (((unative_t ) breakpoints[slot].address) != 0)
258	return;	260	return;
259	printf("** Found ZERO on address %lx (slot %d) **\n",	261	printf("* Found ZERO on address %lx (slot %d) *\n",
260	breakpoints[slot].address, slot);	262	breakpoints[slot].address, slot);
261	} else {	263	} else {
262	printf("Data watchpoint - new data: %lx\n",	264	printf("Data watchpoint - new data: %lx\n",
263	((unative_t ) breakpoints[slot].address));	265	((unative_t ) breakpoints[slot].address));
264	}	266	}
265	}	267	}
266	printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),	268	printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
267	get_symtab_entry(getip(istate)));	269	get_symtab_entry(getip(istate)));
268	printf("***Type 'exit' to exit kconsole.\n");	270	printf("***Type 'exit' to exit kconsole.\n");
269	atomic_set(&haltstate,1);	271	atomic_set(&haltstate,1);
270	kconsole((void *) "debug");	272	kconsole((void *) "debug");
271	atomic_set(&haltstate,0);	273	atomic_set(&haltstate,0);
272	}	274	}
273		275
274	void breakpoint_del(int slot)	276	void breakpoint_del(int slot)
275	{	277	{
276	bpinfo_t *cur;	278	bpinfo_t *cur;
277	ipl_t ipl;	279	ipl_t ipl;
278		280
279	ipl = interrupts_disable();	281	ipl = interrupts_disable();
280	spinlock_lock(&bkpoint_lock);	282	spinlock_lock(&bkpoint_lock);
281		283
282	cur = &breakpoints[slot];	284	cur = &breakpoints[slot];
283	if (!cur->address) {	285	if (!cur->address) {
284	spinlock_unlock(&bkpoint_lock);	286	spinlock_unlock(&bkpoint_lock);
285	interrupts_restore(ipl);	287	interrupts_restore(ipl);
286	return;	288	return;
287	}	289	}
288		290
289	cur->address = NULL;	291	cur->address = NULL;
290		292
291	setup_dr(slot);	293	setup_dr(slot);
292		294
293	spinlock_unlock(&bkpoint_lock);	295	spinlock_unlock(&bkpoint_lock);
294	interrupts_restore(ipl);	296	interrupts_restore(ipl);
295	#ifdef CONFIG_SMP	297	#ifdef CONFIG_SMP
296	// ipi_broadcast(VECTOR_DEBUG_IPI);	298	// ipi_broadcast(VECTOR_DEBUG_IPI);
297	#endif	299	#endif
298	}	300	}
299		301
300	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	302	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
301		303
302	/** Remove breakpoint from table */	304	/** Remove breakpoint from table */
303	int cmd_del_breakpoint(cmd_arg_t *argv)	305	int cmd_del_breakpoint(cmd_arg_t *argv)
304	{	306	{
305	unative_t bpno = argv->intval;	307	unative_t bpno = argv->intval;
306	if (bpno > BKPOINTS_MAX) {	308	if (bpno > BKPOINTS_MAX) {
307	printf("Invalid breakpoint number.\n");	309	printf("Invalid breakpoint number.\n");
308	return 0;	310	return 0;
309	}	311	}
310	breakpoint_del(argv->intval);	312	breakpoint_del(argv->intval);
311	return 1;	313	return 1;
312	}	314	}
313		315
314	/** Add new breakpoint to table */	316	/** Add new breakpoint to table */
315	static int cmd_add_breakpoint(cmd_arg_t *argv)	317	static int cmd_add_breakpoint(cmd_arg_t *argv)
316	{	318	{
317	int flags;	319	int flags;
318	int id;	320	int id;
319		321
320	if (argv == &add_argv) {	322	if (argv == &add_argv) {
321	flags = BKPOINT_INSTR;	323	flags = BKPOINT_INSTR;
322	} else { /* addwatchp */	324	} else { /* addwatchp */
323	flags = BKPOINT_WRITE;	325	flags = BKPOINT_WRITE;
324	}	326	}
325	printf("Adding breakpoint on address: %p\n", argv->intval);	327	printf("Adding breakpoint on address: %p\n", argv->intval);
326	id = breakpoint_add((void *)argv->intval, flags, -1);	328	id = breakpoint_add((void *)argv->intval, flags, -1);
327	if (id < 0)	329	if (id < 0)
328	printf("Add breakpoint failed.\n");	330	printf("Add breakpoint failed.\n");
329	else	331	else
330	printf("Added breakpoint %d.\n", id);	332	printf("Added breakpoint %d.\n", id);
331		333
332	return 1;	334	return 1;
333	}	335	}
334	#endif	336	#endif
335		337
336	static void debug_exception(int n __attribute__((unused)), istate_t *istate)	338	static void debug_exception(int n __attribute__((unused)), istate_t *istate)
337	{	339	{
338	unative_t dr6;	340	unative_t dr6;
339	int i;	341	int i;
340		342
341	/* Set RF to restart the instruction */	343	/* Set RF to restart the instruction */
342	#ifdef amd64	344	#ifdef amd64
343	istate->rflags \|= RFLAGS_RF;	345	istate->rflags \|= RFLAGS_RF;
344	#else	346	#else
345	istate->eflags \|= EFLAGS_RF;	347	istate->eflags \|= EFLAGS_RF;
346	#endif	348	#endif
347		349
348	dr6 = read_dr6();	350	dr6 = read_dr6();
349	for (i=0; i < BKPOINTS_MAX; i++) {	351	for (i=0; i < BKPOINTS_MAX; i++) {
350	if (dr6 & (1 << i)) {	352	if (dr6 & (1 << i)) {
351	dr6 &= ~ (1 << i);	353	dr6 &= ~ (1 << i);
352	write_dr6(dr6);	354	write_dr6(dr6);
353		355
354	handle_exception(i, istate);	356	handle_exception(i, istate);
355	}	357	}
356	}	358	}
357	}	359	}
358		360
359	#ifdef CONFIG_SMP	361	#ifdef CONFIG_SMP
-		362	static void
-		363	debug_ipi(int n __attribute__((unused)),
360	static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))	364	istate_t *istate __attribute__((unused)))
361	{	365	{
362	int i;	366	int i;
363		367
364	spinlock_lock(&bkpoint_lock);	368	spinlock_lock(&bkpoint_lock);
365	for (i = 0; i < BKPOINTS_MAX; i++)	369	for (i = 0; i < BKPOINTS_MAX; i++)
366	setup_dr(i);	370	setup_dr(i);
367	spinlock_unlock(&bkpoint_lock);	371	spinlock_unlock(&bkpoint_lock);
368	}	372	}
369	#endif	373	#endif
370		374
371	/** Initialize debugger */	375	/** Initialize debugger */
372	void debugger_init()	376	void debugger_init()
373	{	377	{
374	int i;	378	int i;
375		379
376	for (i=0; i<BKPOINTS_MAX; i++)	380	for (i = 0; i < BKPOINTS_MAX; i++)
377	breakpoints[i].address = NULL;	381	breakpoints[i].address = NULL;
378		382
379	cmd_initialize(&bkpts_info);	383	cmd_initialize(&bkpts_info);
380	if (!cmd_register(&bkpts_info))	384	if (!cmd_register(&bkpts_info))
381	panic("could not register command %s\n", bkpts_info.name);	385	panic("could not register command %s\n", bkpts_info.name);
382		386
383	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	387	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
384	cmd_initialize(&delbkpt_info);	388	cmd_initialize(&delbkpt_info);
385	if (!cmd_register(&delbkpt_info))	389	if (!cmd_register(&delbkpt_info))
386	panic("could not register command %s\n", delbkpt_info.name);	390	panic("could not register command %s\n", delbkpt_info.name);
387		391
388	cmd_initialize(&addbkpt_info);	392	cmd_initialize(&addbkpt_info);
389	if (!cmd_register(&addbkpt_info))	393	if (!cmd_register(&addbkpt_info))
390	panic("could not register command %s\n", addbkpt_info.name);	394	panic("could not register command %s\n", addbkpt_info.name);
391		395
392	cmd_initialize(&addwatchp_info);	396	cmd_initialize(&addwatchp_info);
393	if (!cmd_register(&addwatchp_info))	397	if (!cmd_register(&addwatchp_info))
394	panic("could not register command %s\n", addwatchp_info.name);	398	panic("could not register command %s\n", addwatchp_info.name);
395	#endif	399	#endif
396		400
397	exc_register(VECTOR_DEBUG, "debugger",	401	exc_register(VECTOR_DEBUG, "debugger", debug_exception);
398	debug_exception);	-
399	#ifdef CONFIG_SMP	402	#ifdef CONFIG_SMP
400	exc_register(VECTOR_DEBUG_IPI, "debugger_smp",	403	exc_register(VECTOR_DEBUG_IPI, "debugger_smp", debug_ipi);
401	debug_ipi);	-
402	#endif	404	#endif
403	}	405	}
404		406
405	/** @}	407	/** @}
406	*/	408	*/
407		409

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/amd64/src/debugger.c – Rev 3071 → 3138