WebSVN – HelenOS – Diff – /tags/0.2.0.5/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)))
{
    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. %lx 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(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)
{
    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 __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 2441	Rev 2474
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	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. %lx in %s\n", i,	114	printf("%d. %lx 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	unative_t 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 \|= ((unative_t) 0x3) << (18 + 4*curidx);	156	dr7 \|= ((unative_t) 0x3) << (18 + 4*curidx);
157	else /* 8 */	157	else /* 8 */
158	dr7 \|= ((unative_t) 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 \|= ((unative_t) 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 \|= ((unative_t) 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	* @param where Address of HW breakpoint	176	* @param where Address of HW breakpoint
177	* @param flags Type of breakpoint (EXECUTE, WRITE)	177	* @param flags Type of breakpoint (EXECUTE, WRITE)
178	* @return Debug slot on success, -1 - no available HW breakpoint	178	* @return Debug slot on success, -1 - no available HW breakpoint
179	*/	179	*/
180	int breakpoint_add(const void *where, const int flags, int curidx)	180	int breakpoint_add(const void *where, const int flags, int curidx)
181	{	181	{
182	ipl_t ipl;	182	ipl_t ipl;
183	int i;	183	int i;
184	bpinfo_t *cur;	184	bpinfo_t *cur;
185		185
186	ASSERT(flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));	186	ASSERT(flags & (BKPOINT_INSTR \| BKPOINT_WRITE \| BKPOINT_READ_WRITE));
187		187
188	ipl = interrupts_disable();	188	ipl = interrupts_disable();
189	spinlock_lock(&bkpoint_lock);	189	spinlock_lock(&bkpoint_lock);
190		190
191	if (curidx == -1) {	191	if (curidx == -1) {
192	/* Find free space in slots */	192	/* Find free space in slots */
193	for (i = 0; i < BKPOINTS_MAX; i++)	193	for (i = 0; i < BKPOINTS_MAX; i++)
194	if (!breakpoints[i].address) {	194	if (!breakpoints[i].address) {
195	curidx = i;	195	curidx = i;
196	break;	196	break;
197	}	197	}
198	if (curidx == -1) {	198	if (curidx == -1) {
199	/* Too many breakpoints */	199	/* Too many breakpoints */
200	spinlock_unlock(&bkpoint_lock);	200	spinlock_unlock(&bkpoint_lock);
201	interrupts_restore(ipl);	201	interrupts_restore(ipl);
202	return -1;	202	return -1;
203	}	203	}
204	}	204	}
205	cur = &breakpoints[curidx];	205	cur = &breakpoints[curidx];
206		206
207	cur->address = (uintptr_t) where;	207	cur->address = (uintptr_t) where;
208	cur->flags = flags;	208	cur->flags = flags;
209	cur->counter = 0;	209	cur->counter = 0;
210		210
211	setup_dr(curidx);	211	setup_dr(curidx);
212		212
213	spinlock_unlock(&bkpoint_lock);	213	spinlock_unlock(&bkpoint_lock);
214	interrupts_restore(ipl);	214	interrupts_restore(ipl);
215		215
216	/* Send IPI */	216	/* Send IPI */
217	#ifdef CONFIG_SMP	217	#ifdef CONFIG_SMP
218	// ipi_broadcast(VECTOR_DEBUG_IPI);	218	// ipi_broadcast(VECTOR_DEBUG_IPI);
219	#endif	219	#endif
220		220
221	return curidx;	221	return curidx;
222	}	222	}
223		223
224	#ifdef amd64	224	#ifdef amd64
225	# define getip(x) ((x)->rip)	225	# define getip(x) ((x)->rip)
226	#else	226	#else
227	# define getip(x) ((x)->eip)	227	# define getip(x) ((x)->eip)
228	#endif	228	#endif
229		229
230	static void handle_exception(int slot, istate_t *istate)	230	static void handle_exception(int slot, istate_t *istate)
231	{	231	{
232	ASSERT(breakpoints[slot].address);	232	ASSERT(breakpoints[slot].address);
233		233
234	/* Handle zero checker */	234	/* Handle zero checker */
235	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {	235	if (! (breakpoints[slot].flags & BKPOINT_INSTR)) {
236	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {	236	if ((breakpoints[slot].flags & BKPOINT_CHECK_ZERO)) {
237	if (((unative_t ) breakpoints[slot].address) != 0)	237	if (((unative_t ) breakpoints[slot].address) != 0)
238	return;	238	return;
239	printf("** Found ZERO on address %lx (slot %d) **\n",	239	printf("** Found ZERO on address %lx (slot %d) **\n",
240	breakpoints[slot].address, slot);	240	breakpoints[slot].address, slot);
241	} else {	241	} else {
242	printf("Data watchpoint - new data: %lx\n",	242	printf("Data watchpoint - new data: %lx\n",
243	((unative_t ) breakpoints[slot].address));	243	((unative_t ) breakpoints[slot].address));
244	}	244	}
245	}	245	}
246	printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),	246	printf("Reached breakpoint %d:%lx(%s)\n", slot, getip(istate),
247	get_symtab_entry(getip(istate)));	247	get_symtab_entry(getip(istate)));
248	printf("***Type 'exit' to exit kconsole.\n");	248	printf("***Type 'exit' to exit kconsole.\n");
249	atomic_set(&haltstate,1);	249	atomic_set(&haltstate,1);
250	kconsole((void *) "debug");	250	kconsole((void *) "debug");
251	atomic_set(&haltstate,0);	251	atomic_set(&haltstate,0);
252	}	252	}
253		253
254	void breakpoint_del(int slot)	254	void breakpoint_del(int slot)
255	{	255	{
256	bpinfo_t *cur;	256	bpinfo_t *cur;
257	ipl_t ipl;	257	ipl_t ipl;
258		258
259	ipl = interrupts_disable();	259	ipl = interrupts_disable();
260	spinlock_lock(&bkpoint_lock);	260	spinlock_lock(&bkpoint_lock);
261		261
262	cur = &breakpoints[slot];	262	cur = &breakpoints[slot];
263	if (!cur->address) {	263	if (!cur->address) {
264	spinlock_unlock(&bkpoint_lock);	264	spinlock_unlock(&bkpoint_lock);
265	interrupts_restore(ipl);	265	interrupts_restore(ipl);
266	return;	266	return;
267	}	267	}
268		268
269	cur->address = NULL;	269	cur->address = NULL;
270		270
271	setup_dr(slot);	271	setup_dr(slot);
272		272
273	spinlock_unlock(&bkpoint_lock);	273	spinlock_unlock(&bkpoint_lock);
274	interrupts_restore(ipl);	274	interrupts_restore(ipl);
275	#ifdef CONFIG_SMP	275	#ifdef CONFIG_SMP
276	// ipi_broadcast(VECTOR_DEBUG_IPI);	276	// ipi_broadcast(VECTOR_DEBUG_IPI);
277	#endif	277	#endif
278	}	278	}
279		279
280	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	280	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
281		281
282	/** Remove breakpoint from table */	282	/** Remove breakpoint from table */
283	int cmd_del_breakpoint(cmd_arg_t *argv)	283	int cmd_del_breakpoint(cmd_arg_t *argv)
284	{	284	{
285	if (argv->intval < 0 \|\| argv->intval > BKPOINTS_MAX) {	285	if (argv->intval < 0 \|\| argv->intval > BKPOINTS_MAX) {
286	printf("Invalid breakpoint number.\n");	286	printf("Invalid breakpoint number.\n");
287	return 0;	287	return 0;
288	}	288	}
289	breakpoint_del(argv->intval);	289	breakpoint_del(argv->intval);
290	return 1;	290	return 1;
291	}	291	}
292		292
293	/** Add new breakpoint to table */	293	/** Add new breakpoint to table */
294	static int cmd_add_breakpoint(cmd_arg_t *argv)	294	static int cmd_add_breakpoint(cmd_arg_t *argv)
295	{	295	{
296	int flags;	296	int flags;
297	int id;	297	int id;
298		298
299	if (argv == &add_argv) {	299	if (argv == &add_argv) {
300	flags = BKPOINT_INSTR;	300	flags = BKPOINT_INSTR;
301	} else { /* addwatchp */	301	} else { /* addwatchp */
302	flags = BKPOINT_WRITE;	302	flags = BKPOINT_WRITE;
303	}	303	}
304	printf("Adding breakpoint on address: %p\n", argv->intval);	304	printf("Adding breakpoint on address: %p\n", argv->intval);
305	id = breakpoint_add((void *)argv->intval, flags, -1);	305	id = breakpoint_add((void *)argv->intval, flags, -1);
306	if (id < 0)	306	if (id < 0)
307	printf("Add breakpoint failed.\n");	307	printf("Add breakpoint failed.\n");
308	else	308	else
309	printf("Added breakpoint %d.\n", id);	309	printf("Added breakpoint %d.\n", id);
310		310
311	return 1;	311	return 1;
312	}	312	}
313	#endif	313	#endif
314		314
315	static void debug_exception(int n __attribute__((unused)), istate_t *istate)	315	static void debug_exception(int n __attribute__((unused)), istate_t *istate)
316	{	316	{
317	unative_t dr6;	317	unative_t dr6;
318	int i;	318	int i;
319		319
320	/* Set RF to restart the instruction */	320	/* Set RF to restart the instruction */
321	#ifdef amd64	321	#ifdef amd64
322	istate->rflags \|= RFLAGS_RF;	322	istate->rflags \|= RFLAGS_RF;
323	#else	323	#else
324	istate->eflags \|= EFLAGS_RF;	324	istate->eflags \|= EFLAGS_RF;
325	#endif	325	#endif
326		326
327	dr6 = read_dr6();	327	dr6 = read_dr6();
328	for (i=0; i < BKPOINTS_MAX; i++) {	328	for (i=0; i < BKPOINTS_MAX; i++) {
329	if (dr6 & (1 << i)) {	329	if (dr6 & (1 << i)) {
330	dr6 &= ~ (1 << i);	330	dr6 &= ~ (1 << i);
331	write_dr6(dr6);	331	write_dr6(dr6);
332		332
333	handle_exception(i, istate);	333	handle_exception(i, istate);
334	}	334	}
335	}	335	}
336	}	336	}
337		337
338	#ifdef CONFIG_SMP	338	#ifdef CONFIG_SMP
339	static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))	339	static void debug_ipi(int n __attribute__((unused)), istate_t *istate __attribute__((unused)))
340	{	340	{
341	int i;	341	int i;
342		342
343	spinlock_lock(&bkpoint_lock);	343	spinlock_lock(&bkpoint_lock);
344	for (i = 0; i < BKPOINTS_MAX; i++)	344	for (i = 0; i < BKPOINTS_MAX; i++)
345	setup_dr(i);	345	setup_dr(i);
346	spinlock_unlock(&bkpoint_lock);	346	spinlock_unlock(&bkpoint_lock);
347	}	347	}
348	#endif	348	#endif
349		349
350	/** Initialize debugger */	350	/** Initialize debugger */
351	void debugger_init()	351	void debugger_init()
352	{	352	{
353	int i;	353	int i;
354		354
355	for (i=0; i<BKPOINTS_MAX; i++)	355	for (i=0; i<BKPOINTS_MAX; i++)
356	breakpoints[i].address = NULL;	356	breakpoints[i].address = NULL;
357		357
358	cmd_initialize(&bkpts_info);	358	cmd_initialize(&bkpts_info);
359	if (!cmd_register(&bkpts_info))	359	if (!cmd_register(&bkpts_info))
360	panic("could not register command %s\n", bkpts_info.name);	360	panic("could not register command %s\n", bkpts_info.name);
361		361
362	#ifndef CONFIG_DEBUG_AS_WATCHPOINT	362	#ifndef CONFIG_DEBUG_AS_WATCHPOINT
363	cmd_initialize(&delbkpt_info);	363	cmd_initialize(&delbkpt_info);
364	if (!cmd_register(&delbkpt_info))	364	if (!cmd_register(&delbkpt_info))
365	panic("could not register command %s\n", delbkpt_info.name);	365	panic("could not register command %s\n", delbkpt_info.name);
366		366
367	cmd_initialize(&addbkpt_info);	367	cmd_initialize(&addbkpt_info);
368	if (!cmd_register(&addbkpt_info))	368	if (!cmd_register(&addbkpt_info))
369	panic("could not register command %s\n", addbkpt_info.name);	369	panic("could not register command %s\n", addbkpt_info.name);
370		370
371	cmd_initialize(&addwatchp_info);	371	cmd_initialize(&addwatchp_info);
372	if (!cmd_register(&addwatchp_info))	372	if (!cmd_register(&addwatchp_info))
373	panic("could not register command %s\n", addwatchp_info.name);	373	panic("could not register command %s\n", addwatchp_info.name);
374	#endif	374	#endif
375		375
376	exc_register(VECTOR_DEBUG, "debugger",	376	exc_register(VECTOR_DEBUG, "debugger",
377	debug_exception);	377	debug_exception);
378	#ifdef CONFIG_SMP	378	#ifdef CONFIG_SMP
379	exc_register(VECTOR_DEBUG_IPI, "debugger_smp",	379	exc_register(VECTOR_DEBUG_IPI, "debugger_smp",
380	debug_ipi);	380	debug_ipi);
381	#endif	381	#endif
382	}	382	}
383		383
384	/** @}	384	/** @}
385	*/	385	*/
386		386

Subversion Repositories HelenOS

(root)/tags/0.2.0.5/kernel/arch/amd64/src/debugger.c – Rev 2441 → 2474