[qemu.git] / gdbstub.c

/*
 * gdb server stub
 * 
 * Copyright (c) 2003 Fabrice Bellard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <signal.h>

#include "config.h"
#ifdef TARGET_I386
#include "cpu-i386.h"
#endif
#ifdef TARGET_ARM
#include "cpu-arm.h"
#endif
#include "thunk.h"
#include "exec.h"

//#define DEBUG_GDB

int gdbstub_fd = -1;

/* return 0 if OK */
static int gdbstub_open(int port)
{
    struct sockaddr_in sockaddr;
    socklen_t len;
    int fd, val, ret;

    fd = socket(PF_INET, SOCK_STREAM, 0);
    if (fd < 0) {
        perror("socket");
        return -1;
    }

    /* allow fast reuse */
    val = 1;
    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));

    sockaddr.sin_family = AF_INET;
    sockaddr.sin_port = htons(port);
    sockaddr.sin_addr.s_addr = 0;
    ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
    if (ret < 0) {
        perror("bind");
        return -1;
    }
    ret = listen(fd, 0);
    if (ret < 0) {
        perror("listen");
        return -1;
    }
    
    /* now wait for one connection */
    for(;;) {
        len = sizeof(sockaddr);
        gdbstub_fd = accept(fd, (struct sockaddr *)&sockaddr, &len);
        if (gdbstub_fd < 0 && errno != EINTR) {
            perror("accept");
            return -1;
        } else if (gdbstub_fd >= 0) {
            break;
        }
    }
    
    /* set short latency */
    val = 1;
    setsockopt(gdbstub_fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val));
    return 0;
}

static int get_char(void)
{
    uint8_t ch;
    int ret;

    for(;;) {
        ret = read(gdbstub_fd, &ch, 1);
        if (ret < 0) {
            if (errno != EINTR && errno != EAGAIN)
                return -1;
        } else if (ret == 0) {
            return -1;
        } else {
            break;
        }
    }
    return ch;
}

static void put_buffer(const uint8_t *buf, int len)
{
    int ret;

    while (len > 0) {
        ret = write(gdbstub_fd, buf, len);
        if (ret < 0) {
            if (errno != EINTR && errno != EAGAIN)
                return;
        } else {
            buf += ret;
            len -= ret;
        }
    }
}

static inline int fromhex(int v)
{
    if (v >= '0' && v <= '9')
        return v - '0';
    else if (v >= 'A' && v <= 'F')
        return v - 'A' + 10;
    else if (v >= 'a' && v <= 'f')
        return v - 'a' + 10;
    else
        return 0;
}

static inline int tohex(int v)
{
    if (v < 10)
        return v + '0';
    else
        return v - 10 + 'a';
}

static void memtohex(char *buf, const uint8_t *mem, int len)
{
    int i, c;
    char *q;
    q = buf;
    for(i = 0; i < len; i++) {
        c = mem[i];
        *q++ = tohex(c >> 4);
        *q++ = tohex(c & 0xf);
    }
    *q = '\0';
}

static void hextomem(uint8_t *mem, const char *buf, int len)
{
    int i;

    for(i = 0; i < len; i++) {
        mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]);
        buf += 2;
    }
}

/* return -1 if error or EOF */
static int get_packet(char *buf, int buf_size)
{
    int ch, len, csum, csum1;
    char reply[1];
    
    for(;;) {
        for(;;) {
            ch = get_char();
            if (ch < 0)
                return -1;
            if (ch == '$')
                break;
        }
        len = 0;
        csum = 0;
        for(;;) {
            ch = get_char();
            if (ch < 0)
                return -1;
            if (ch == '#')
                break;
            if (len > buf_size - 1)
                return -1;
            buf[len++] = ch;
            csum += ch;
        }
        buf[len] = '\0';
        ch = get_char();
        if (ch < 0)
            return -1;
        csum1 = fromhex(ch) << 4;
        ch = get_char();
        if (ch < 0)
            return -1;
        csum1 |= fromhex(ch);
        if ((csum & 0xff) != csum1) {
            reply[0] = '-';
            put_buffer(reply, 1);
        } else {
            reply[0] = '+';
            put_buffer(reply, 1);
            break;
        }
    }
#ifdef DEBUG_GDB
    printf("command='%s'\n", buf);
#endif
    return len;
}

/* return -1 if error, 0 if OK */
static int put_packet(char *buf)
{
    char buf1[3];
    int len, csum, ch, i;

#ifdef DEBUG_GDB
    printf("reply='%s'\n", buf);
#endif

    for(;;) {
        buf1[0] = '$';
        put_buffer(buf1, 1);
        len = strlen(buf);
        put_buffer(buf, len);
        csum = 0;
        for(i = 0; i < len; i++) {
            csum += buf[i];
        }
        buf1[0] = '#';
        buf1[1] = tohex((csum >> 4) & 0xf);
        buf1[2] = tohex((csum) & 0xf);

        put_buffer(buf1, 3);

        ch = get_char();
        if (ch < 0)
            return -1;
        if (ch == '+')
            break;
    }
    return 0;
}

static int memory_rw(uint8_t *buf, uint32_t addr, int len, int is_write)
{
    int l, flags;
    uint32_t page;

    while (len > 0) {
        page = addr & TARGET_PAGE_MASK;
        l = (page + TARGET_PAGE_SIZE) - addr;
        if (l > len)
            l = len;
        flags = page_get_flags(page);
        if (!(flags & PAGE_VALID))
            return -1;
        if (is_write) {
            if (!(flags & PAGE_WRITE))
                return -1;
            memcpy((uint8_t *)addr, buf, l);
        } else {
            if (!(flags & PAGE_READ))
                return -1;
            memcpy(buf, (uint8_t *)addr, l);
        }
        len -= l;
        buf += l;
        addr += l;
    }
    return 0;
}

/* port = 0 means default port */
int cpu_gdbstub(void *opaque, int (*main_loop)(void *opaque), int port)
{
    CPUState *env;
    const char *p;
    int ret, ch, nb_regs, i, type;
    char buf[4096];
    uint8_t mem_buf[2000];
    uint32_t *registers;
    uint32_t addr, len;
    
    printf("Waiting gdb connection on port %d\n", port);
    if (gdbstub_open(port) < 0)
        return -1;
    printf("Connected\n");
    for(;;) {
        ret = get_packet(buf, sizeof(buf));
        if (ret < 0)
            break;
        p = buf;
        ch = *p++;
        switch(ch) {
        case '?':
            snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
            put_packet(buf);
            break;
        case 'c':
            if (*p != '\0') {
                addr = strtoul(p, (char **)&p, 16);
                env = cpu_gdbstub_get_env(opaque);
#if defined(TARGET_I386)
                env->eip = addr;
#endif
            }
            ret = main_loop(opaque);
            if (ret == EXCP_DEBUG)
                ret = SIGTRAP;
            else
                ret = 0;
            snprintf(buf, sizeof(buf), "S%02x", ret);
            put_packet(buf);
            break;
        case 's':
            env = cpu_gdbstub_get_env(opaque);
            if (*p != '\0') {
                addr = strtoul(p, (char **)&p, 16);
#if defined(TARGET_I386)
                env->eip = addr;
#endif
            }
            cpu_single_step(env, 1);
            ret = main_loop(opaque);
            cpu_single_step(env, 0);
            if (ret == EXCP_DEBUG)
                ret = SIGTRAP;
            else
                ret = 0;
            snprintf(buf, sizeof(buf), "S%02x", ret);
            put_packet(buf);
            break;
        case 'g':
            env = cpu_gdbstub_get_env(opaque);
            registers = (void *)mem_buf;
#if defined(TARGET_I386)
            for(i = 0; i < 8; i++) {
                registers[i] = tswapl(env->regs[i]);
            }
            registers[8] = env->eip;
            registers[9] = env->eflags;
            registers[10] = env->segs[R_CS].selector;
            registers[11] = env->segs[R_SS].selector;
            registers[12] = env->segs[R_DS].selector;
            registers[13] = env->segs[R_ES].selector;
            registers[14] = env->segs[R_FS].selector;
            registers[15] = env->segs[R_GS].selector;
            nb_regs = 16;
#endif
            memtohex(buf, (const uint8_t *)registers, 
                     sizeof(registers[0]) * nb_regs);
            put_packet(buf);
            break;
        case 'G':
            env = cpu_gdbstub_get_env(opaque);
            registers = (void *)mem_buf;
#if defined(TARGET_I386)
            hextomem((uint8_t *)registers, p, 16 * 4);
            for(i = 0; i < 8; i++) {
                env->regs[i] = tswapl(registers[i]);
            }
            env->eip = registers[8];
            env->eflags = registers[9];
#define LOAD_SEG(index, sreg)\
            if (tswapl(registers[index]) != env->segs[sreg].selector)\
                cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
            LOAD_SEG(10, R_CS);
            LOAD_SEG(11, R_SS);
            LOAD_SEG(12, R_DS);
            LOAD_SEG(13, R_ES);
            LOAD_SEG(14, R_FS);
            LOAD_SEG(15, R_GS);
#endif
            put_packet("OK");
            break;
        case 'm':
            addr = strtoul(p, (char **)&p, 16);
            if (*p == ',')
                p++;
            len = strtoul(p, NULL, 16);
            if (memory_rw(mem_buf, addr, len, 0) != 0)
                memset(mem_buf, 0, len);
            memtohex(buf, mem_buf, len);
            put_packet(buf);
            break;
        case 'M':
            addr = strtoul(p, (char **)&p, 16);
            if (*p == ',')
                p++;
            len = strtoul(p, (char **)&p, 16);
            if (*p == ',')
                p++;
            hextomem(mem_buf, p, len);
            if (memory_rw(mem_buf, addr, len, 1) != 0)
                put_packet("ENN");
            else
                put_packet("OK");
            break;
        case 'Z':
            type = strtoul(p, (char **)&p, 16);
            if (*p == ',')
                p++;
            addr = strtoul(p, (char **)&p, 16);
            if (*p == ',')
                p++;
            len = strtoul(p, (char **)&p, 16);
            if (type == 0 || type == 1) {
                env = cpu_gdbstub_get_env(opaque);
                if (cpu_breakpoint_insert(env, addr) < 0)
                    goto breakpoint_error;
                put_packet("OK");
            } else {
            breakpoint_error:
                put_packet("ENN");
            }
            break;
        case 'z':
            type = strtoul(p, (char **)&p, 16);
            if (*p == ',')
                p++;
            addr = strtoul(p, (char **)&p, 16);
            if (*p == ',')
                p++;
            len = strtoul(p, (char **)&p, 16);
            if (type == 0 || type == 1) {
                env = cpu_gdbstub_get_env(opaque);
                cpu_breakpoint_remove(env, addr);
                put_packet("OK");
            } else {
                goto breakpoint_error;
            }
            break;
        default:
            /* put empty packet */
            buf[0] = '\0';
            put_packet(buf);
            break;
        }
    }
    return 0;
}
Commit	Line	Data
b4608c04 FB	1	/*
	2	* gdb server stub
	3	*
	4	* Copyright (c) 2003 Fabrice Bellard
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with this library; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20	#include <stdlib.h>
	21	#include <stdio.h>
	22	#include <string.h>
	23	#include <unistd.h>
	24	#include <errno.h>
	25	#include <sys/socket.h>
	26	#include <netinet/in.h>
	27	#include <netinet/tcp.h>
	28	#include <signal.h>
	29
	30	#include "config.h"
	31	#ifdef TARGET_I386
	32	#include "cpu-i386.h"
	33	#endif
	34	#ifdef TARGET_ARM
	35	#include "cpu-arm.h"
	36	#endif
	37	#include "thunk.h"
	38	#include "exec.h"
	39
4abe615b	40	//#define DEBUG_GDB
b4608c04 FB	41
	42	int gdbstub_fd = -1;
	43
	44	/* return 0 if OK */
	45	static int gdbstub_open(int port)
	46	{
	47	struct sockaddr_in sockaddr;
	48	socklen_t len;
	49	int fd, val, ret;
	50
	51	fd = socket(PF_INET, SOCK_STREAM, 0);
	52	if (fd < 0) {
	53	perror("socket");
	54	return -1;
	55	}
	56
	57	/* allow fast reuse */
	58	val = 1;
	59	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
	60
	61	sockaddr.sin_family = AF_INET;
	62	sockaddr.sin_port = htons(port);
	63	sockaddr.sin_addr.s_addr = 0;
	64	ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
	65	if (ret < 0) {
	66	perror("bind");
	67	return -1;
	68	}
	69	ret = listen(fd, 0);
	70	if (ret < 0) {
	71	perror("listen");
	72	return -1;
	73	}
	74
	75	/* now wait for one connection */
	76	for(;;) {
	77	len = sizeof(sockaddr);
	78	gdbstub_fd = accept(fd, (struct sockaddr *)&sockaddr, &len);
	79	if (gdbstub_fd < 0 && errno != EINTR) {
	80	perror("accept");
	81	return -1;
	82	} else if (gdbstub_fd >= 0) {
	83	break;
	84	}
	85	}
	86
	87	/* set short latency */
	88	val = 1;
	89	setsockopt(gdbstub_fd, SOL_TCP, TCP_NODELAY, &val, sizeof(val));
	90	return 0;
	91	}
	92
	93	static int get_char(void)
	94	{
	95	uint8_t ch;
	96	int ret;
	97
	98	for(;;) {
	99	ret = read(gdbstub_fd, &ch, 1);
	100	if (ret < 0) {
	101	if (errno != EINTR && errno != EAGAIN)
	102	return -1;
	103	} else if (ret == 0) {
	104	return -1;
105	} else {
106	break;
107	}
108	}
109	return ch;
110	}
111
112	static void put_buffer(const uint8_t *buf, int len)
113	{
114	int ret;
115
116	while (len > 0) {
117	ret = write(gdbstub_fd, buf, len);
118	if (ret < 0) {
119	if (errno != EINTR && errno != EAGAIN)
120	return;
121	} else {
122	buf += ret;
123	len -= ret;
124	}
125	}
126	}
127
128	static inline int fromhex(int v)
129	{
130	if (v >= '0' && v <= '9')
131	return v - '0';
132	else if (v >= 'A' && v <= 'F')
133	return v - 'A' + 10;
134	else if (v >= 'a' && v <= 'f')
135	return v - 'a' + 10;
136	else
137	return 0;
138	}
139
140	static inline int tohex(int v)
141	{
142	if (v < 10)
143	return v + '0';
144	else
145	return v - 10 + 'a';
146	}
147
148	static void memtohex(char buf, const uint8_t mem, int len)
149	{
150	int i, c;
151	char *q;
152	q = buf;
153	for(i = 0; i < len; i++) {
154	c = mem[i];
155	*q++ = tohex(c >> 4);
156	*q++ = tohex(c & 0xf);
157	}
158	*q = '\0';
159	}
160
161	static void hextomem(uint8_t mem, const char buf, int len)
162	{
163	int i;
164
165	for(i = 0; i < len; i++) {
166	mem[i] = (fromhex(buf[0]) << 4) \| fromhex(buf[1]);
167	buf += 2;
168	}
169	}
170
171	/* return -1 if error or EOF */
172	static int get_packet(char *buf, int buf_size)
173	{
174	int ch, len, csum, csum1;
175	char reply[1];
176
177	for(;;) {
178	for(;;) {
179	ch = get_char();
180	if (ch < 0)
181	return -1;
182	if (ch == '$')
183	break;
184	}
185	len = 0;
186	csum = 0;
187	for(;;) {
188	ch = get_char();
189	if (ch < 0)
190	return -1;
191	if (ch == '#')
192	break;
193	if (len > buf_size - 1)
194	return -1;
195	buf[len++] = ch;
196	csum += ch;
197	}
198	buf[len] = '\0';
199	ch = get_char();
200	if (ch < 0)
201	return -1;
202	csum1 = fromhex(ch) << 4;
203	ch = get_char();
204	if (ch < 0)
205	return -1;
206	csum1 \|= fromhex(ch);
207	if ((csum & 0xff) != csum1) {
208	reply[0] = '-';
209	put_buffer(reply, 1);
210	} else {
211	reply[0] = '+';
212	put_buffer(reply, 1);
213	break;
214	}
215	}
216	#ifdef DEBUG_GDB
217	printf("command='%s'\n", buf);
218	#endif
219	return len;
220	}
221
222	/* return -1 if error, 0 if OK */
223	static int put_packet(char *buf)
224	{
225	char buf1[3];
226	int len, csum, ch, i;
227
228	#ifdef DEBUG_GDB
229	printf("reply='%s'\n", buf);
230	#endif
231
232	for(;;) {
233	buf1[0] = '$';
234	put_buffer(buf1, 1);
235	len = strlen(buf);
236	put_buffer(buf, len);
237	csum = 0;
238	for(i = 0; i < len; i++) {
239	csum += buf[i];
240	}
241	buf1[0] = '#';
242	buf1[1] = tohex((csum >> 4) & 0xf);
243	buf1[2] = tohex((csum) & 0xf);
244
245	put_buffer(buf1, 3);
246
247	ch = get_char();
248	if (ch < 0)
249	return -1;
250	if (ch == '+')
251	break;
252	}
253	return 0;
254	}
255
256	static int memory_rw(uint8_t *buf, uint32_t addr, int len, int is_write)
257	{
258	int l, flags;
259	uint32_t page;
260
261	while (len > 0) {
262	page = addr & TARGET_PAGE_MASK;
263	l = (page + TARGET_PAGE_SIZE) - addr;
264	if (l > len)
265	l = len;
266	flags = page_get_flags(page);
267	if (!(flags & PAGE_VALID))
268	return -1;
269	if (is_write) {
270	if (!(flags & PAGE_WRITE))
271	return -1;
272	memcpy((uint8_t *)addr, buf, l);
273	} else {
274	if (!(flags & PAGE_READ))
275	return -1;
276	memcpy(buf, (uint8_t *)addr, l);
277	}
278	len -= l;
279	buf += l;
280	addr += l;
281	}
282	return 0;
283	}
284
285	/* port = 0 means default port */
4c3a88a2	286	int cpu_gdbstub(void opaque, int (main_loop)(void *opaque), int port)
b4608c04 FB	287	{
	288	CPUState *env;
	289	const char *p;
4c3a88a2	290	int ret, ch, nb_regs, i, type;
b4608c04 FB	291	char buf[4096];
	292	uint8_t mem_buf[2000];
	293	uint32_t *registers;
	294	uint32_t addr, len;
	295
	296	printf("Waiting gdb connection on port %d\n", port);
	297	if (gdbstub_open(port) < 0)
	298	return -1;
	299	printf("Connected\n");
	300	for(;;) {
	301	ret = get_packet(buf, sizeof(buf));
	302	if (ret < 0)
	303	break;
	304	p = buf;
	305	ch = *p++;
	306	switch(ch) {
	307	case '?':
	308	snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
	309	put_packet(buf);
	310	break;
	311	case 'c':
4c3a88a2 FB	312	if (*p != '\0') {
	313	addr = strtoul(p, (char **)&p, 16);
	314	env = cpu_gdbstub_get_env(opaque);
	315	#if defined(TARGET_I386)
	316	env->eip = addr;
	317	#endif
	318	}
	319	ret = main_loop(opaque);
	320	if (ret == EXCP_DEBUG)
	321	ret = SIGTRAP;
	322	else
	323	ret = 0;
	324	snprintf(buf, sizeof(buf), "S%02x", ret);
b4608c04 FB	325	put_packet(buf);
b4608c04 FB	326	break;
c33a346e FB	327	case 's':
	328	env = cpu_gdbstub_get_env(opaque);
	329	if (*p != '\0') {
	330	addr = strtoul(p, (char **)&p, 16);
	331	#if defined(TARGET_I386)
	332	env->eip = addr;
	333	#endif
	334	}
	335	cpu_single_step(env, 1);
	336	ret = main_loop(opaque);
	337	cpu_single_step(env, 0);
	338	if (ret == EXCP_DEBUG)
	339	ret = SIGTRAP;
	340	else
	341	ret = 0;
	342	snprintf(buf, sizeof(buf), "S%02x", ret);
	343	put_packet(buf);
	344	break;
b4608c04 FB	345	case 'g':
	346	env = cpu_gdbstub_get_env(opaque);
	347	registers = (void *)mem_buf;
	348	#if defined(TARGET_I386)
	349	for(i = 0; i < 8; i++) {
	350	registers[i] = tswapl(env->regs[i]);
	351	}
	352	registers[8] = env->eip;
	353	registers[9] = env->eflags;
	354	registers[10] = env->segs[R_CS].selector;
	355	registers[11] = env->segs[R_SS].selector;
	356	registers[12] = env->segs[R_DS].selector;
	357	registers[13] = env->segs[R_ES].selector;
	358	registers[14] = env->segs[R_FS].selector;
	359	registers[15] = env->segs[R_GS].selector;
	360	nb_regs = 16;
	361	#endif
	362	memtohex(buf, (const uint8_t *)registers,
	363	sizeof(registers[0]) * nb_regs);
	364	put_packet(buf);
	365	break;
	366	case 'G':
	367	env = cpu_gdbstub_get_env(opaque);
	368	registers = (void *)mem_buf;
	369	#if defined(TARGET_I386)
	370	hextomem((uint8_t )registers, p, 16 4);
	371	for(i = 0; i < 8; i++) {
	372	env->regs[i] = tswapl(registers[i]);
	373	}
	374	env->eip = registers[8];
	375	env->eflags = registers[9];
	376	#define LOAD_SEG(index, sreg)\
	377	if (tswapl(registers[index]) != env->segs[sreg].selector)\
	378	cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
	379	LOAD_SEG(10, R_CS);
	380	LOAD_SEG(11, R_SS);
	381	LOAD_SEG(12, R_DS);
	382	LOAD_SEG(13, R_ES);
	383	LOAD_SEG(14, R_FS);
	384	LOAD_SEG(15, R_GS);
	385	#endif
	386	put_packet("OK");
	387	break;
	388	case 'm':
	389	addr = strtoul(p, (char **)&p, 16);
	390	if (*p == ',')
	391	p++;
	392	len = strtoul(p, NULL, 16);
	393	if (memory_rw(mem_buf, addr, len, 0) != 0)
	394	memset(mem_buf, 0, len);
	395	memtohex(buf, mem_buf, len);
	396	put_packet(buf);
	397	break;
	398	case 'M':
	399	addr = strtoul(p, (char **)&p, 16);
	400	if (*p == ',')
	401	p++;
	402	len = strtoul(p, (char **)&p, 16);
	403	if (*p == ',')
	404	p++;
	405	hextomem(mem_buf, p, len);
	406	if (memory_rw(mem_buf, addr, len, 1) != 0)
	407	put_packet("ENN");
	408	else
409	put_packet("OK");
410	break;
4c3a88a2 FB	411	case 'Z':
	412	type = strtoul(p, (char **)&p, 16);
	413	if (*p == ',')
	414	p++;
	415	addr = strtoul(p, (char **)&p, 16);
	416	if (*p == ',')
	417	p++;
	418	len = strtoul(p, (char **)&p, 16);
	419	if (type == 0 \|\| type == 1) {
	420	env = cpu_gdbstub_get_env(opaque);
	421	if (cpu_breakpoint_insert(env, addr) < 0)
	422	goto breakpoint_error;
	423	put_packet("OK");
	424	} else {
	425	breakpoint_error:
	426	put_packet("ENN");
	427	}
	428	break;
	429	case 'z':
	430	type = strtoul(p, (char **)&p, 16);
	431	if (*p == ',')
	432	p++;
	433	addr = strtoul(p, (char **)&p, 16);
	434	if (*p == ',')
	435	p++;
	436	len = strtoul(p, (char **)&p, 16);
	437	if (type == 0 \|\| type == 1) {
	438	env = cpu_gdbstub_get_env(opaque);
	439	cpu_breakpoint_remove(env, addr);
	440	put_packet("OK");
	441	} else {
	442	goto breakpoint_error;
	443	}
	444	break;
b4608c04 FB	445	default:
	446	/* put empty packet */
	447	buf[0] = '\0';
	448	put_packet(buf);
	449	break;
	450	}
	451	}
	452	return 0;
	453	}