WebSVN – HelenOS-historic – Diff – /kernel/trunk/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)
{
    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);
            printf("\n");
        }
    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(void * where, 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 %p ****\n",
                   slot, breakpoints[slot].address);
        } else {
            printf("Data watchpoint - new data: %p\n",
                   *((unative_t *) breakpoints[slot].address));
        }
    }
    printf("Reached breakpoint %d:%p(%s)\n", slot, getip(istate),
           get_symtab_entry(getip(istate)));
    printf("***Type 'exit' to exit kconsole.\n");
    atomic_set(&haltstate,1);
    kconsole("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)
{
    if (argv->intval < 0 || argv->intval > 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, 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, istate_t *istate)
{
    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 1705	Rev 1780
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	__address 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)	105	int cmd_print_breakpoints(cmd_arg_t *argv)
106	{	106	{
107	int i;	107	int i;
108	char *symbol;	108	char *symbol;
109		109
110	printf("Breakpoint table.\n");	110	printf("Breakpoint table.\n");
111	for (i=0; i < BKPOINTS_MAX; i++)	111	for (i=0; i < BKPOINTS_MAX; i++)
112	if (breakpoints[i].address) {	112	if (breakpoints[i].address) {
113	symbol = get_symtab_entry(breakpoints[i].address);	113	symbol = get_symtab_entry(breakpoints[i].address);
114	printf("%d. %p in %s\n",i,	114	printf("%d. %p in %s\n",i,
115	breakpoints[i].address, symbol);	115	breakpoints[i].address, symbol);
116	printf(" Count(%d) ", breakpoints[i].counter);	116	printf(" Count(%d) ", breakpoints[i].counter);
117	printf("\n");	117	printf("\n");
118	}	118	}
119	return 1;	119	return 1;
120	}	120	}
121		121
122	/* Setup DR register according to table */	122	/* Setup DR register according to table */
123	static void setup_dr(int curidx)	123	static void setup_dr(int curidx)
124	{	124	{
125	__native dr7;	125	unative_t dr7;
126	bpinfo_t *cur = &breakpoints[curidx];	126	bpinfo_t *cur = &breakpoints[curidx];
127	int flags = breakpoints[curidx].flags;	127	int flags = breakpoints[curidx].flags;
128		128
129	/* Disable breakpoint in DR7 */	129	/* Disable breakpoint in DR7 */
130	dr7 = read_dr7();	130	dr7 = read_dr7();
131	dr7 &= ~(0x2 << (curidx*2));	131	dr7 &= ~(0x2 << (curidx*2));
132		132
133	if (cur->address) { /* Setup DR register */	133	if (cur->address) { /* Setup DR register */
134	/* Set breakpoint to debug registers */	134	/* Set breakpoint to debug registers */
135	switch (curidx) {	135	switch (curidx) {
136	case 0:	136	case 0:
137	write_dr0(cur->address);	137	write_dr0(cur->address);
138	break;	138	break;
139	case 1:	139	case 1:
140	write_dr1(cur->address);	140	write_dr1(cur->address);
141	break;	141	break;
142	case 2:	142	case 2:
143	write_dr2(cur->address);	143	write_dr2(cur->address);
144	break;	144	break;
145	case 3:	145	case 3:
146	write_dr3(cur->address);	146	write_dr3(cur->address);
147	break;	147	break;
148	}	148	}
149	/* Set type to requested breakpoint & length*/	149	/* Set type to requested breakpoint & length*/
150	dr7 &= ~ (0x3 << (16 + 4*curidx));	150	dr7 &= ~ (0x3 << (16 + 4*curidx));
151	dr7 &= ~ (0x3 << (18 + 4*curidx));	151	dr7 &= ~ (0x3 << (18 + 4*curidx));
152	if ((flags & BKPOINT_INSTR)) {	152	if ((flags & BKPOINT_INSTR)) {
153	;	153	;
154	} else {	154	} else {
155	if (sizeof(int) == 4)	155	if (sizeof(int) == 4)
156	dr7 \|= ((__native) 0x3) << (18 + 4*curidx);	156	dr7 \|= ((unative_t) 0x3) << (18 + 4*curidx);
157	else /* 8 */	157	else /* 8 */
158	dr7 \|= ((__native) 0x2) << (18 + 4*curidx);	158	dr7 \|= ((unative_t) 0x2) << (18 + 4*curidx);
159		159
160	if ((flags & BKPOINT_WRITE))	160	if ((flags & BKPOINT_WRITE))
161	dr7 \|= ((__native) 0x1) << (16 + 4*curidx);	161	dr7 \|= ((unative_t) 0x1) << (16 + 4*curidx);
162	else if ((flags & BKPOINT_READ_WRITE))	162	else if ((flags & BKPOINT_READ_WRITE))
163	dr7 \|= ((__native) 0x3) << (16 + 4*curidx);	163	dr7 \|= ((unative_t) 0x3) << (16 + 4*curidx);
164	}	164	}
165		165
166	/* Enable global breakpoint */	166	/* Enable global breakpoint */
167	dr7 \|= 0x2 << (curidx*2);	167	dr7 \|= 0x2 << (curidx*2);
168		168
169	write_dr7(dr7);	169	write_dr7(dr7);
170		170
171	}	171	}
172	}	172	}
173		173
174	/** Enable hardware breakpoint	174	/** Enable hardware breakpoint
175	*	175	*
176	*	176	*
177	* @param where Address of HW breakpoint	177	* @param where Address of HW breakpoint
178	* @param flags Type of breakpoint (EXECUTE, WRITE)	178	* @param flags Type of breakpoint (EXECUTE, WRITE)
179	* @return Debug slot on success, -1 - no available HW breakpoint	179	* @return Debug slot on success, -1 - no available HW breakpoint
180	*/	180	*/
181	int breakpoint_add(void * where, int flags, int curidx)	181	int breakpoint_add(void * where, int flags, int curidx)
182	{	182	{
183	ipl_t ipl;	183	ipl_t ipl;
184	int i;	184	int i;
185	bpinfo_t *cur;	185	bpinfo_t *cur;
186		186
187	ASSERT( flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));	187	ASSERT( flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));
188		188
189	ipl = interrupts_disable();	189	ipl = interrupts_disable();
190	spinlock_lock(&bkpoint_lock);	190	spinlock_lock(&bkpoint_lock);
191		191
192	if (curidx == -1) {	192	if (curidx == -1) {
193	/* Find free space in slots */	193	/* Find free space in slots */
194	for (i=0; i<BKPOINTS_MAX; i++)	194	for (i=0; i<BKPOINTS_MAX; i++)
195	if (!breakpoints[i].address) {	195	if (!breakpoints[i].address) {
196	curidx = i;	196	curidx = i;
197	break;	197	break;
198	}	198	}
199	if (curidx == -1) {	199	if (curidx == -1) {
200	/* Too many breakpoints */	200	/* Too many breakpoints */
201	spinlock_unlock(&bkpoint_lock);	201	spinlock_unlock(&bkpoint_lock);
202	interrupts_restore(ipl);	202	interrupts_restore(ipl);
203	return -1;	203	return -1;
204	}	204	}
205	}	205	}
206	cur = &breakpoints[curidx];	206	cur = &breakpoints[curidx];
207		207
208	cur->address = (__address) where;	208	cur->address = (uintptr_t) where;
209	cur->flags = flags;	209	cur->flags = flags;
210	cur->counter = 0;	210	cur->counter = 0;
211		211
212	setup_dr(curidx);	212	setup_dr(curidx);
213		213
214	spinlock_unlock(&bkpoint_lock);	214	spinlock_unlock(&bkpoint_lock);
215	interrupts_restore(ipl);	215	interrupts_restore(ipl);
216		216
217	/* Send IPI */	217	/* Send IPI */
218	#ifdef CONFIG_SMP	218	#ifdef CONFIG_SMP
219	// ipi_broadcast(VECTOR_DEBUG_IPI);	219	// ipi_broadcast(VECTOR_DEBUG_IPI);
220	#endif	220	#endif
221		221
222	return curidx;	222	return curidx;
223	}	223	}
224		224
225	#ifdef amd64	225	#ifdef amd64
226	# define getip(x) ((x)->rip)	226	# define getip(x) ((x)->rip)
227	#else	227	#else
228	# define getip(x) ((x)->eip)	228	# define getip(x) ((x)->eip)
229	#endif	229	#endif
230		230
231	static void handle_exception(int slot, istate_t *istate)	231	static void handle_exception(int slot, istate_t *istate)
232	{	232	{
233	ASSERT(breakpoints[slot].address);	233	ASSERT(breakpoints[slot].address);
234		234
235	/* Handle zero checker */	235	/* Handle zero checker */
236	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {	236	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
237	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {	237	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
238	if (((__native ) breakpoints[slot].address) != 0)	238	if (((unative_t ) breakpoints[slot].address) != 0)
239	return;	239	return;
240	printf("** Found ZERO on address %p **\n",	240	printf("** Found ZERO on address %p **\n",
241	slot, breakpoints[slot].address);	241	slot, breakpoints[slot].address);
242	} else {	242	} else {
243	printf("Data watchpoint - new data: %p\n",	243	printf("Data watchpoint - new data: %p\n",
244	((__native ) breakpoints[slot].address));	244	((unative_t ) breakpoints[slot].address));
245	}	245	}
246	}	246	}
247	printf("Reached breakpoint %d:%p(%s)\n", slot, getip(istate),	247	printf("Reached breakpoint %d:%p(%s)\n", slot, getip(istate),
248	get_symtab_entry(getip(istate)));	248	get_symtab_entry(getip(istate)));
249	printf("***Type 'exit' to exit kconsole.\n");	249	printf("***Type 'exit' to exit kconsole.\n");
250	atomic_set(&haltstate,1);	250	atomic_set(&haltstate,1);
251	kconsole("debug");	251	kconsole("debug");
252	atomic_set(&haltstate,0);	252	atomic_set(&haltstate,0);
253	}	253	}
254		254
255	void breakpoint_del(int slot)	255	void breakpoint_del(int slot)
256	{	256	{
257	bpinfo_t *cur;	257	bpinfo_t *cur;
258	ipl_t ipl;	258	ipl_t ipl;
259		259
260	ipl = interrupts_disable();	260	ipl = interrupts_disable();
261	spinlock_lock(&bkpoint_lock);	261	spinlock_lock(&bkpoint_lock);
262		262
263	cur = &breakpoints[slot];	263	cur = &breakpoints[slot];
264	if (!cur->address) {	264	if (!cur->address) {
265	spinlock_unlock(&bkpoint_lock);	265	spinlock_unlock(&bkpoint_lock);
266	interrupts_restore(ipl);	266	interrupts_restore(ipl);
267	return;	267	return;
268	}	268	}
269		269
270	cur->address = NULL;	270	cur->address = NULL;
271		271
272	setup_dr(slot);	272	setup_dr(slot);
273		273
274	spinlock_unlock(&bkpoint_lock);	274	spinlock_unlock(&bkpoint_lock);
275	interrupts_restore(ipl);	275	interrupts_restore(ipl);
276	#ifdef CONFIG_SMP	276	#ifdef CONFIG_SMP
277	// ipi_broadcast(VECTOR_DEBUG_IPI);	277	// ipi_broadcast(VECTOR_DEBUG_IPI);
278	#endif	278	#endif
279	}	279	}
280		280
281	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	281	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
282		282
283	/** Remove breakpoint from table */	283	/** Remove breakpoint from table */
284	int cmd_del_breakpoint(cmd_arg_t *argv)	284	int cmd_del_breakpoint(cmd_arg_t *argv)
285	{	285	{
286	if (argv->intval < 0 \|\| argv->intval > BKPOINTS_MAX) {	286	if (argv->intval < 0 \|\| argv->intval > BKPOINTS_MAX) {
287	printf("Invalid breakpoint number.\n");	287	printf("Invalid breakpoint number.\n");
288	return 0;	288	return 0;
289	}	289	}
290	breakpoint_del(argv->intval);	290	breakpoint_del(argv->intval);
291	return 1;	291	return 1;
292	}	292	}
293		293
294	/** Add new breakpoint to table */	294	/** Add new breakpoint to table */
295	static int cmd_add_breakpoint(cmd_arg_t *argv)	295	static int cmd_add_breakpoint(cmd_arg_t *argv)
296	{	296	{
297	int flags;	297	int flags;
298	int id;	298	int id;
299		299
300	if (argv == &add_argv) {	300	if (argv == &add_argv) {
301	flags = BKPOINT_INSTR;	301	flags = BKPOINT_INSTR;
302	} else { /* addwatchp */	302	} else { /* addwatchp */
303	flags = BKPOINT_WRITE;	303	flags = BKPOINT_WRITE;
304	}	304	}
305	printf("Adding breakpoint on address: %p\n", argv->intval);	305	printf("Adding breakpoint on address: %p\n", argv->intval);
306	id = breakpoint_add((void *)argv->intval, flags, -1);	306	id = breakpoint_add((void *)argv->intval, flags, -1);
307	if (id < 0)	307	if (id < 0)
308	printf("Add breakpoint failed.\n");	308	printf("Add breakpoint failed.\n");
309	else	309	else
310	printf("Added breakpoint %d.\n", id);	310	printf("Added breakpoint %d.\n", id);
311		311
312	return 1;	312	return 1;
313	}	313	}
314	#endif	314	#endif
315		315
316	static void debug_exception(int n, istate_t *istate)	316	static void debug_exception(int n, istate_t *istate)
317	{	317	{
318	__native dr6;	318	unative_t dr6;
319	int i;	319	int i;
320		320
321	/* Set RF to restart the instruction */	321	/* Set RF to restart the instruction */
322	#ifdef amd64	322	#ifdef amd64
323	istate->rflags \|= RFLAGS_RF;	323	istate->rflags \|= RFLAGS_RF;
324	#else	324	#else
325	istate->eflags \|= EFLAGS_RF;	325	istate->eflags \|= EFLAGS_RF;
326	#endif	326	#endif
327		327
328	dr6 = read_dr6();	328	dr6 = read_dr6();
329	for (i=0; i < BKPOINTS_MAX; i++) {	329	for (i=0; i < BKPOINTS_MAX; i++) {
330	if (dr6 & (1 << i)) {	330	if (dr6 & (1 << i)) {
331	dr6 &= ~ (1 << i);	331	dr6 &= ~ (1 << i);
332	write_dr6(dr6);	332	write_dr6(dr6);
333		333
334	handle_exception(i, istate);	334	handle_exception(i, istate);
335	}	335	}
336	}	336	}
337	}	337	}
338		338
339	#ifdef CONFIG_SMP	339	#ifdef CONFIG_SMP
340	static void debug_ipi(int n, istate_t *istate)	340	static void debug_ipi(int n, istate_t *istate)
341	{	341	{
342	int i;	342	int i;
343		343
344	spinlock_lock(&bkpoint_lock);	344	spinlock_lock(&bkpoint_lock);
345	for (i=0; i < BKPOINTS_MAX; i++)	345	for (i=0; i < BKPOINTS_MAX; i++)
346	setup_dr(i);	346	setup_dr(i);
347	spinlock_unlock(&bkpoint_lock);	347	spinlock_unlock(&bkpoint_lock);
348	}	348	}
349	#endif	349	#endif
350		350
351	/** Initialize debugger */	351	/** Initialize debugger */
352	void debugger_init()	352	void debugger_init()
353	{	353	{
354	int i;	354	int i;
355		355
356	for (i=0; i<BKPOINTS_MAX; i++)	356	for (i=0; i<BKPOINTS_MAX; i++)
357	breakpoints[i].address = NULL;	357	breakpoints[i].address = NULL;
358		358
359	cmd_initialize(&bkpts_info);	359	cmd_initialize(&bkpts_info);
360	if (!cmd_register(&bkpts_info))	360	if (!cmd_register(&bkpts_info))
361	panic("could not register command %s\n", bkpts_info.name);	361	panic("could not register command %s\n", bkpts_info.name);
362		362
363	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	363	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
364	cmd_initialize(&delbkpt_info);	364	cmd_initialize(&delbkpt_info);
365	if (!cmd_register(&delbkpt_info))	365	if (!cmd_register(&delbkpt_info))
366	panic("could not register command %s\n", delbkpt_info.name);	366	panic("could not register command %s\n", delbkpt_info.name);
367		367
368	cmd_initialize(&addbkpt_info);	368	cmd_initialize(&addbkpt_info);
369	if (!cmd_register(&addbkpt_info))	369	if (!cmd_register(&addbkpt_info))
370	panic("could not register command %s\n", addbkpt_info.name);	370	panic("could not register command %s\n", addbkpt_info.name);
371		371
372	cmd_initialize(&addwatchp_info);	372	cmd_initialize(&addwatchp_info);
373	if (!cmd_register(&addwatchp_info))	373	if (!cmd_register(&addwatchp_info))
374	panic("could not register command %s\n", addwatchp_info.name);	374	panic("could not register command %s\n", addwatchp_info.name);
375	#endif	375	#endif
376		376
377	exc_register(VECTOR_DEBUG, "debugger",	377	exc_register(VECTOR_DEBUG, "debugger",
378	debug_exception);	378	debug_exception);
379	#ifdef CONFIG_SMP	379	#ifdef CONFIG_SMP
380	exc_register(VECTOR_DEBUG_IPI, "debugger_smp",	380	exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
381	debug_ipi);	381	debug_ipi);
382	#endif	382	#endif
383	}	383	}
384		384
385	/** @}	385	/** @}
386	*/	386	*/
387		387
388		388

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(root)/kernel/trunk/arch/amd64/src/debugger.c – Rev 1705 → 1780