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;
   
    if (sizeof(void *) == 4) {
        printf("#  Count Address    In symbol\n");
        printf("-- ----- ---------- ---------\n");
    } else {
        printf("#  Count Address            In symbol\n");
        printf("-- ----- ------------------ ---------\n");
    }
   
    for (i = 0; i < BKPOINTS_MAX; i++)
        if (breakpoints[i].address) {
            symbol = get_symtab_entry(breakpoints[i].address);
           
            if (sizeof(void *) == 4)
                printf("%-2u %-5d %#10zx %s\n", i, breakpoints[i].counter,
                    breakpoints[i].address, symbol);
            else
                printf("%-2u %-5d %#18zx %s\n", i, breakpoints[i].counter,
                    breakpoints[i].address, symbol);
        }
    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 {
            if (sizeof(int) == 4)
                dr7 |= ((unative_t) 0x3) << (18 + 4*curidx);
            else /* 8 */
                dr7 |= ((unative_t) 0x2) << (18 + 4*curidx);
           
            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 2712	Rev 2767
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	if (sizeof(void *) == 4) {	110	if (sizeof(void *) == 4) {
111	printf("# Count Address In symbol\n");	111	printf("# Count Address In symbol\n");
112	printf("-- ----- ---------- ---------\n");	112	printf("-- ----- ---------- ---------\n");
113	} else {	113	} else {
114	printf("# Count Address In symbol\n");	114	printf("# Count Address In symbol\n");
115	printf("-- ----- ------------------ ---------\n");	115	printf("-- ----- ------------------ ---------\n");
116	}	116	}
117		117
118	for (i = 0; i < BKPOINTS_MAX; i++)	118	for (i = 0; i < BKPOINTS_MAX; i++)
119	if (breakpoints[i].address) {	119	if (breakpoints[i].address) {
120	symbol = get_symtab_entry(breakpoints[i].address);	120	symbol = get_symtab_entry(breakpoints[i].address);
121		121
122	if (sizeof(void *) == 4)	122	if (sizeof(void *) == 4)
123	printf("%-2u %-5d %#10zx %s\n", i, breakpoints[i].counter,	123	printf("%-2u %-5d %#10zx %s\n", i, breakpoints[i].counter,
124	breakpoints[i].address, symbol);	124	breakpoints[i].address, symbol);
125	else	125	else
126	printf("%-2u %-5d %#18zx %s\n", i, breakpoints[i].counter,	126	printf("%-2u %-5d %#18zx %s\n", i, breakpoints[i].counter,
127	breakpoints[i].address, symbol);	127	breakpoints[i].address, symbol);
128	}	128	}
129	return 1;	129	return 1;
130	}	130	}
131		131
132	/* Setup DR register according to table */	132	/* Setup DR register according to table */
133	static void setup_dr(int curidx)	133	static void setup_dr(int curidx)
134	{	134	{
135	unative_t dr7;	135	unative_t dr7;
136	bpinfo_t *cur = &breakpoints[curidx];	136	bpinfo_t *cur = &breakpoints[curidx];
137	int flags = breakpoints[curidx].flags;	137	int flags = breakpoints[curidx].flags;
138		138
139	/* Disable breakpoint in DR7 */	139	/* Disable breakpoint in DR7 */
140	dr7 = read_dr7();	140	dr7 = read_dr7();
141	dr7 &= ~(0x2 << (curidx*2));	141	dr7 &= ~(0x2 << (curidx*2));
142		142
143	if (cur->address) { /* Setup DR register */	143	if (cur->address) { /* Setup DR register */
144	/* Set breakpoint to debug registers */	144	/* Set breakpoint to debug registers */
145	switch (curidx) {	145	switch (curidx) {
146	case 0:	146	case 0:
147	write_dr0(cur->address);	147	write_dr0(cur->address);
148	break;	148	break;
149	case 1:	149	case 1:
150	write_dr1(cur->address);	150	write_dr1(cur->address);
151	break;	151	break;
152	case 2:	152	case 2:
153	write_dr2(cur->address);	153	write_dr2(cur->address);
154	break;	154	break;
155	case 3:	155	case 3:
156	write_dr3(cur->address);	156	write_dr3(cur->address);
157	break;	157	break;
158	}	158	}
159	/* Set type to requested breakpoint & length*/	159	/* Set type to requested breakpoint & length*/
160	dr7 &= ~ (0x3 << (16 + 4*curidx));	160	dr7 &= ~ (0x3 << (16 + 4*curidx));
161	dr7 &= ~ (0x3 << (18 + 4*curidx));	161	dr7 &= ~ (0x3 << (18 + 4*curidx));
162	if ((flags & BKPOINT_INSTR)) {	162	if ((flags & BKPOINT_INSTR)) {
163	;	163	;
164	} else {	164	} else {
165	if (sizeof(int) == 4)	165	if (sizeof(int) == 4)
166	dr7 \|= ((unative_t) 0x3) << (18 + 4*curidx);	166	dr7 \|= ((unative_t) 0x3) << (18 + 4*curidx);
167	else /* 8 */	167	else /* 8 */
168	dr7 \|= ((unative_t) 0x2) << (18 + 4*curidx);	168	dr7 \|= ((unative_t) 0x2) << (18 + 4*curidx);
169		169
170	if ((flags & BKPOINT_WRITE))	170	if ((flags & BKPOINT_WRITE))
171	dr7 \|= ((unative_t) 0x1) << (16 + 4*curidx);	171	dr7 \|= ((unative_t) 0x1) << (16 + 4*curidx);
172	else if ((flags & BKPOINT_READ_WRITE))	172	else if ((flags & BKPOINT_READ_WRITE))
173	dr7 \|= ((unative_t) 0x3) << (16 + 4*curidx);	173	dr7 \|= ((unative_t) 0x3) << (16 + 4*curidx);
174	}	174	}
175		175
176	/* Enable global breakpoint */	176	/* Enable global breakpoint */
177	dr7 \|= 0x2 << (curidx*2);	177	dr7 \|= 0x2 << (curidx*2);
178		178
179	write_dr7(dr7);	179	write_dr7(dr7);
180		180
181	}	181	}
182	}	182	}
183		183
184	/** Enable hardware breakpoint	184	/** Enable hardware breakpoint
185	*	185	*
186	* @param where Address of HW breakpoint	186	* @param where Address of HW breakpoint
187	* @param flags Type of breakpoint (EXECUTE, WRITE)	187	* @param flags Type of breakpoint (EXECUTE, WRITE)
188	* @return Debug slot on success, -1 - no available HW breakpoint	188	* @return Debug slot on success, -1 - no available HW breakpoint
189	*/	189	*/
190	int breakpoint_add(const void *where, const int flags, int curidx)	190	int breakpoint_add(const void *where, const int flags, int curidx)
191	{	191	{
192	ipl_t ipl;	192	ipl_t ipl;
193	int i;	193	int i;
194	bpinfo_t *cur;	194	bpinfo_t *cur;
195		195
196	ASSERT(flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));	196	ASSERT(flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));
197		197
198	ipl = interrupts_disable();	198	ipl = interrupts_disable();
199	spinlock_lock(&bkpoint_lock);	199	spinlock_lock(&bkpoint_lock);
200		200
201	if (curidx == -1) {	201	if (curidx == -1) {
202	/* Find free space in slots */	202	/* Find free space in slots */
203	for (i = 0; i < BKPOINTS_MAX; i++)	203	for (i = 0; i < BKPOINTS_MAX; i++)
204	if (!breakpoints[i].address) {	204	if (!breakpoints[i].address) {
205	curidx = i;	205	curidx = i;
206	break;	206	break;
207	}	207	}
208	if (curidx == -1) {	208	if (curidx == -1) {
209	/* Too many breakpoints */	209	/* Too many breakpoints */
210	spinlock_unlock(&bkpoint_lock);	210	spinlock_unlock(&bkpoint_lock);
211	interrupts_restore(ipl);	211	interrupts_restore(ipl);
212	return -1;	212	return -1;
213	}	213	}
214	}	214	}
215	cur = &breakpoints[curidx];	215	cur = &breakpoints[curidx];
216		216
217	cur->address = (uintptr_t) where;	217	cur->address = (uintptr_t) where;
218	cur->flags = flags;	218	cur->flags = flags;
219	cur->counter = 0;	219	cur->counter = 0;
220		220
221	setup_dr(curidx);	221	setup_dr(curidx);
222		222
223	spinlock_unlock(&bkpoint_lock);	223	spinlock_unlock(&bkpoint_lock);
224	interrupts_restore(ipl);	224	interrupts_restore(ipl);
225		225
226	/* Send IPI */	226	/* Send IPI */
227	#ifdef CONFIG_SMP	227	#ifdef CONFIG_SMP
228	// ipi_broadcast(VECTOR_DEBUG_IPI);	228	// ipi_broadcast(VECTOR_DEBUG_IPI);
229	#endif	229	#endif
230		230
231	return curidx;	231	return curidx;
232	}	232	}
233		233
234	#ifdef amd64	234	#ifdef amd64
235	# define getip(x) ((x)->rip)	235	# define getip(x) ((x)->rip)
236	#else	236	#else
237	# define getip(x) ((x)->eip)	237	# define getip(x) ((x)->eip)
238	#endif	238	#endif
239		239
240	static void handle_exception(int slot, istate_t *istate)	240	static void handle_exception(int slot, istate_t *istate)
241	{	241	{
242	ASSERT(breakpoints[slot].address);	242	ASSERT(breakpoints[slot].address);
243		243
244	/* Handle zero checker */	244	/* Handle zero checker */
245	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {	245	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
246	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {	246	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
247	if (((unative_t ) breakpoints[slot].address) != 0)	247	if (((unative_t ) breakpoints[slot].address) != 0)
248	return;	248	return;
249	printf("** Found ZERO on address %lx (slot %d) **\n",	249	printf("** Found ZERO on address %lx (slot %d) **\n",
250	breakpoints[slot].address, slot);	250	breakpoints[slot].address, slot);
251	} else {	251	} else {
252	printf("Data watchpoint - new data: %lx\n",	252	printf("Data watchpoint - new data: %lx\n",
253	((unative_t ) breakpoints[slot].address));	253	((unative_t ) breakpoints[slot].address));
254	}	254	}
255	}	255	}
256	printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),	256	printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
257	get_symtab_entry(getip(istate)));	257	get_symtab_entry(getip(istate)));
258	printf("***Type 'exit' to exit kconsole.\n");	258	printf("***Type 'exit' to exit kconsole.\n");
259	atomic_set(&haltstate,1);	259	atomic_set(&haltstate,1);
260	kconsole((void *) "debug");	260	kconsole((void *) "debug");
261	atomic_set(&haltstate,0);	261	atomic_set(&haltstate,0);
262	}	262	}
263		263
264	void breakpoint_del(int slot)	264	void breakpoint_del(int slot)
265	{	265	{
266	bpinfo_t *cur;	266	bpinfo_t *cur;
267	ipl_t ipl;	267	ipl_t ipl;
268		268
269	ipl = interrupts_disable();	269	ipl = interrupts_disable();
270	spinlock_lock(&bkpoint_lock);	270	spinlock_lock(&bkpoint_lock);
271		271
272	cur = &breakpoints[slot];	272	cur = &breakpoints[slot];
273	if (!cur->address) {	273	if (!cur->address) {
274	spinlock_unlock(&bkpoint_lock);	274	spinlock_unlock(&bkpoint_lock);
275	interrupts_restore(ipl);	275	interrupts_restore(ipl);
276	return;	276	return;
277	}	277	}
278		278
279	cur->address = NULL;	279	cur->address = NULL;
280		280
281	setup_dr(slot);	281	setup_dr(slot);
282		282
283	spinlock_unlock(&bkpoint_lock);	283	spinlock_unlock(&bkpoint_lock);
284	interrupts_restore(ipl);	284	interrupts_restore(ipl);
285	#ifdef CONFIG_SMP	285	#ifdef CONFIG_SMP
286	// ipi_broadcast(VECTOR_DEBUG_IPI);	286	// ipi_broadcast(VECTOR_DEBUG_IPI);
287	#endif	287	#endif
288	}	288	}
289		289
290	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	290	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
291		291
292	/** Remove breakpoint from table */	292	/** Remove breakpoint from table */
293	int cmd_del_breakpoint(cmd_arg_t *argv)	293	int cmd_del_breakpoint(cmd_arg_t *argv)
294	{	294	{
-		295	unative_t bpno = argv->intval;
295	if (argv->intval < 0 \|\| argv->intval > BKPOINTS_MAX) {	296	if (bpno > BKPOINTS_MAX) {
296	printf("Invalid breakpoint number.\n");	297	printf("Invalid breakpoint number.\n");
297	return 0;	298	return 0;
298	}	299	}
299	breakpoint_del(argv->intval);	300	breakpoint_del(argv->intval);
300	return 1;	301	return 1;
301	}	302	}
302		303
303	/** Add new breakpoint to table */	304	/** Add new breakpoint to table */
304	static int cmd_add_breakpoint(cmd_arg_t *argv)	305	static int cmd_add_breakpoint(cmd_arg_t *argv)
305	{	306	{
306	int flags;	307	int flags;
307	int id;	308	int id;
308		309
309	if (argv == &add_argv) {	310	if (argv == &add_argv) {
310	flags = BKPOINT_INSTR;	311	flags = BKPOINT_INSTR;
311	} else { /* addwatchp */	312	} else { /* addwatchp */
312	flags = BKPOINT_WRITE;	313	flags = BKPOINT_WRITE;
313	}	314	}
314	printf("Adding breakpoint on address: %p\n", argv->intval);	315	printf("Adding breakpoint on address: %p\n", argv->intval);
315	id = breakpoint_add((void *)argv->intval, flags, -1);	316	id = breakpoint_add((void *)argv->intval, flags, -1);
316	if (id < 0)	317	if (id < 0)
317	printf("Add breakpoint failed.\n");	318	printf("Add breakpoint failed.\n");
318	else	319	else
319	printf("Added breakpoint %d.\n", id);	320	printf("Added breakpoint %d.\n", id);
320		321
321	return 1;	322	return 1;
322	}	323	}
323	#endif	324	#endif
324		325
325	static void debug_exception(int n __attribute__((unused)), istate_t *istate)	326	static void debug_exception(int n __attribute__((unused)), istate_t *istate)
326	{	327	{
327	unative_t dr6;	328	unative_t dr6;
328	int i;	329	int i;
329		330
330	/* Set RF to restart the instruction */	331	/* Set RF to restart the instruction */
331	#ifdef amd64	332	#ifdef amd64
332	istate->rflags \|= RFLAGS_RF;	333	istate->rflags \|= RFLAGS_RF;
333	#else	334	#else
334	istate->eflags \|= EFLAGS_RF;	335	istate->eflags \|= EFLAGS_RF;
335	#endif	336	#endif
336		337
337	dr6 = read_dr6();	338	dr6 = read_dr6();
338	for (i=0; i < BKPOINTS_MAX; i++) {	339	for (i=0; i < BKPOINTS_MAX; i++) {
339	if (dr6 & (1 << i)) {	340	if (dr6 & (1 << i)) {
340	dr6 &= ~ (1 << i);	341	dr6 &= ~ (1 << i);
341	write_dr6(dr6);	342	write_dr6(dr6);
342		343
343	handle_exception(i, istate);	344	handle_exception(i, istate);
344	}	345	}
345	}	346	}
346	}	347	}
347		348
348	#ifdef CONFIG_SMP	349	#ifdef CONFIG_SMP
349	static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))	350	static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
350	{	351	{
351	int i;	352	int i;
352		353
353	spinlock_lock(&bkpoint_lock);	354	spinlock_lock(&bkpoint_lock);
354	for (i = 0; i < BKPOINTS_MAX; i++)	355	for (i = 0; i < BKPOINTS_MAX; i++)
355	setup_dr(i);	356	setup_dr(i);
356	spinlock_unlock(&bkpoint_lock);	357	spinlock_unlock(&bkpoint_lock);
357	}	358	}
358	#endif	359	#endif
359		360
360	/** Initialize debugger */	361	/** Initialize debugger */
361	void debugger_init()	362	void debugger_init()
362	{	363	{
363	int i;	364	int i;
364		365
365	for (i=0; i<BKPOINTS_MAX; i++)	366	for (i=0; i<BKPOINTS_MAX; i++)
366	breakpoints[i].address = NULL;	367	breakpoints[i].address = NULL;
367		368
368	cmd_initialize(&bkpts_info);	369	cmd_initialize(&bkpts_info);
369	if (!cmd_register(&bkpts_info))	370	if (!cmd_register(&bkpts_info))
370	panic("could not register command %s\n", bkpts_info.name);	371	panic("could not register command %s\n", bkpts_info.name);
371		372
372	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	373	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
373	cmd_initialize(&delbkpt_info);	374	cmd_initialize(&delbkpt_info);
374	if (!cmd_register(&delbkpt_info))	375	if (!cmd_register(&delbkpt_info))
375	panic("could not register command %s\n", delbkpt_info.name);	376	panic("could not register command %s\n", delbkpt_info.name);
376		377
377	cmd_initialize(&addbkpt_info);	378	cmd_initialize(&addbkpt_info);
378	if (!cmd_register(&addbkpt_info))	379	if (!cmd_register(&addbkpt_info))
379	panic("could not register command %s\n", addbkpt_info.name);	380	panic("could not register command %s\n", addbkpt_info.name);
380		381
381	cmd_initialize(&addwatchp_info);	382	cmd_initialize(&addwatchp_info);
382	if (!cmd_register(&addwatchp_info))	383	if (!cmd_register(&addwatchp_info))
383	panic("could not register command %s\n", addwatchp_info.name);	384	panic("could not register command %s\n", addwatchp_info.name);
384	#endif	385	#endif
385		386
386	exc_register(VECTOR_DEBUG, "debugger",	387	exc_register(VECTOR_DEBUG, "debugger",
387	debug_exception);	388	debug_exception);
388	#ifdef CONFIG_SMP	389	#ifdef CONFIG_SMP
389	exc_register(VECTOR_DEBUG_IPI, "debugger_smp",	390	exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
390	debug_ipi);	391	debug_ipi);
391	#endif	392	#endif
392	}	393	}
393		394
394	/** @}	395	/** @}
395	*/	396	*/
396		397

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(root)/trunk/kernel/arch/amd64/src/debugger.c @ 3071 – Rev 2712 → 2767