[mirror_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 "vl.h"

#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <signal.h>

//#define DEBUG_GDB

enum RSState {
    RS_IDLE,
    RS_GETLINE,
    RS_CHKSUM1,
    RS_CHKSUM2,
};

static int gdbserver_fd;

typedef struct GDBState {
    enum RSState state;
    int fd;
    char line_buf[4096];
    int line_buf_index;
    int line_csum;
} GDBState;

static int get_char(GDBState *s)
{
    uint8_t ch;
    int ret;

    for(;;) {
        ret = read(s->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(GDBState *s, const uint8_t *buf, int len)
{
    int ret;

    while (len > 0) {
        ret = write(s->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, 0 if OK */
static int put_packet(GDBState *s, char *buf)
{
    char buf1[3];
    int len, csum, ch, i;

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

    for(;;) {
        buf1[0] = '$';
        put_buffer(s, buf1, 1);
        len = strlen(buf);
        put_buffer(s, 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(s, buf1, 3);

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

#if defined(TARGET_I386)

static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
    uint32_t *registers = (uint32_t *)mem_buf;
    int i, fpus;

    for(i = 0; i < 8; i++) {
        registers[i] = 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;
    /* XXX: convert floats */
    for(i = 0; i < 8; i++) {
        memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10);
    }
    registers[36] = env->fpuc;
    fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
    registers[37] = fpus;
    registers[38] = 0; /* XXX: convert tags */
    registers[39] = 0; /* fiseg */
    registers[40] = 0; /* fioff */
    registers[41] = 0; /* foseg */
    registers[42] = 0; /* fooff */
    registers[43] = 0; /* fop */
    
    for(i = 0; i < 16; i++)
        tswapls(&registers[i]);
    for(i = 36; i < 44; i++)
        tswapls(&registers[i]);
    return 44 * 4;
}

static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
    uint32_t *registers = (uint32_t *)mem_buf;
    int i;

    for(i = 0; i < 8; i++) {
        env->regs[i] = tswapl(registers[i]);
    }
    env->eip = tswapl(registers[8]);
    env->eflags = tswapl(registers[9]);
#if defined(CONFIG_USER_ONLY)
#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
}

#elif defined (TARGET_PPC)
static uint32_t from_le32 (uint32_t *buf)
{
    uint8_t *p = (uint8_t *)buf;

    return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}

static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
    uint32_t *registers = (uint32_t *)mem_buf, tmp;
    int i;

    /* fill in gprs */
    for(i = 0; i < 32; i++) {
        registers[i] = tswapl(env->gpr[i]);
    }
    /* fill in fprs */
    for (i = 0; i < 32; i++) {
        registers[(i * 2) + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
	registers[(i * 2) + 33] = tswapl(*((uint32_t *)&env->fpr[i] + 1));
    }
    /* nip, msr, ccr, lnk, ctr, xer, mq */
    registers[96] = tswapl(env->nip);
    registers[97] = tswapl(_load_msr(env));
    tmp = 0;
    for (i = 0; i < 8; i++)
        tmp |= env->crf[i] << (32 - ((i + 1) * 4));
    registers[98] = tswapl(tmp);
    registers[99] = tswapl(env->lr);
    registers[100] = tswapl(env->ctr);
    registers[101] = tswapl(_load_xer(env));
    registers[102] = 0;

    return 103 * 4;
}

static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
    uint32_t *registers = (uint32_t *)mem_buf;
    int i;

    /* fill in gprs */
    for (i = 0; i < 32; i++) {
        env->gpr[i] = tswapl(registers[i]);
    }
    /* fill in fprs */
    for (i = 0; i < 32; i++) {
        *((uint32_t *)&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
	*((uint32_t *)&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
    }
    /* nip, msr, ccr, lnk, ctr, xer, mq */
    env->nip = tswapl(registers[96]);
    _store_msr(env, tswapl(registers[97]));
    registers[98] = tswapl(registers[98]);
    for (i = 0; i < 8; i++)
        env->crf[i] = (registers[98] >> (32 - ((i + 1) * 4))) & 0xF;
    env->lr = tswapl(registers[99]);
    env->ctr = tswapl(registers[100]);
    _store_xer(env, tswapl(registers[101]));
}
#elif defined (TARGET_SPARC)
static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
    uint32_t *registers = (uint32_t *)mem_buf, tmp;
    int i;

    /* fill in g0..g7 */
    for(i = 0; i < 7; i++) {
        registers[i] = tswapl(env->gregs[i]);
    }
    /* fill in register window */
    for(i = 0; i < 24; i++) {
        registers[i + 8] = tswapl(env->regwptr[i]);
    }
    /* fill in fprs */
    for (i = 0; i < 32; i++) {
        registers[i + 32] = tswapl(*((uint32_t *)&env->fpr[i]));
    }
    /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
    registers[64] = tswapl(env->y);
    tmp = GET_PSR(env);
    registers[65] = tswapl(tmp);
    registers[66] = tswapl(env->wim);
    registers[67] = tswapl(env->tbr);
    registers[68] = tswapl(env->pc);
    registers[69] = tswapl(env->npc);
    registers[70] = tswapl(env->fsr);
    registers[71] = 0; /* csr */
    registers[72] = 0;

    return 73 * 4;
}

static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
    uint32_t *registers = (uint32_t *)mem_buf;
    int i;

    /* fill in g0..g7 */
    for(i = 0; i < 7; i++) {
        env->gregs[i] = tswapl(registers[i]);
    }
    /* fill in register window */
    for(i = 0; i < 24; i++) {
        env->regwptr[i] = tswapl(registers[i]);
    }
    /* fill in fprs */
    for (i = 0; i < 32; i++) {
        *((uint32_t *)&env->fpr[i]) = tswapl(registers[i + 32]);
    }
    /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
    env->y = tswapl(registers[64]);
    PUT_PSR(env, tswapl(registers[65]));
    env->wim = tswapl(registers[66]);
    env->tbr = tswapl(registers[67]);
    env->pc = tswapl(registers[68]);
    env->npc = tswapl(registers[69]);
    env->fsr = tswapl(registers[70]);
}
#else

static int cpu_gdb_read_registers(CPUState *env, uint8_t *mem_buf)
{
    return 0;
}

static void cpu_gdb_write_registers(CPUState *env, uint8_t *mem_buf, int size)
{
}

#endif

/* port = 0 means default port */
static int gdb_handle_packet(GDBState *s, const char *line_buf)
{
    CPUState *env = cpu_single_env;
    const char *p;
    int ch, reg_size, type;
    char buf[4096];
    uint8_t mem_buf[2000];
    uint32_t *registers;
    uint32_t addr, len;
    
#ifdef DEBUG_GDB
    printf("command='%s'\n", line_buf);
#endif
    p = line_buf;
    ch = *p++;
    switch(ch) {
    case '?':
        snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
        put_packet(s, buf);
        break;
    case 'c':
        if (*p != '\0') {
            addr = strtoul(p, (char **)&p, 16);
#if defined(TARGET_I386)
            env->eip = addr;
#elif defined (TARGET_PPC)
            env->nip = addr;
#elif defined (TARGET_SPARC)
            env->pc = addr;
            env->npc = addr + 4;
#endif
        }
        vm_start();
        break;
    case 's':
        if (*p != '\0') {
            addr = strtoul(p, (char **)&p, 16);
#if defined(TARGET_I386)
            env->eip = addr;
#elif defined (TARGET_PPC)
            env->nip = addr;
#elif defined (TARGET_SPARC)
            env->pc = addr;
            env->npc = addr + 4;
#endif
        }
        cpu_single_step(env, 1);
        vm_start();
        break;
    case 'g':
        reg_size = cpu_gdb_read_registers(env, mem_buf);
        memtohex(buf, mem_buf, reg_size);
        put_packet(s, buf);
        break;
    case 'G':
        registers = (void *)mem_buf;
        len = strlen(p) / 2;
        hextomem((uint8_t *)registers, p, len);
        cpu_gdb_write_registers(env, mem_buf, len);
        put_packet(s, "OK");
        break;
    case 'm':
        addr = strtoul(p, (char **)&p, 16);
        if (*p == ',')
            p++;
        len = strtoul(p, NULL, 16);
        if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0)
            memset(mem_buf, 0, len);
        memtohex(buf, mem_buf, len);
        put_packet(s, 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 (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
            put_packet(s, "ENN");
        else
            put_packet(s, "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) {
            if (cpu_breakpoint_insert(env, addr) < 0)
                goto breakpoint_error;
            put_packet(s, "OK");
        } else {
        breakpoint_error:
            put_packet(s, "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) {
            cpu_breakpoint_remove(env, addr);
            put_packet(s, "OK");
        } else {
            goto breakpoint_error;
        }
        break;
    default:
        //        unknown_command:
        /* put empty packet */
        buf[0] = '\0';
        put_packet(s, buf);
        break;
    }
    return RS_IDLE;
}

static void gdb_vm_stopped(void *opaque, int reason)
{
    GDBState *s = opaque;
    char buf[256];
    int ret;

    /* disable single step if it was enable */
    cpu_single_step(cpu_single_env, 0);

    if (reason == EXCP_DEBUG) {
	tb_flush(cpu_single_env);
        ret = SIGTRAP;
    }
    else
        ret = 0;
    snprintf(buf, sizeof(buf), "S%02x", ret);
    put_packet(s, buf);
}

static void gdb_read_byte(GDBState *s, int ch)
{
    int i, csum;
    char reply[1];

    if (vm_running) {
        /* when the CPU is running, we cannot do anything except stop
           it when receiving a char */
        vm_stop(EXCP_INTERRUPT);
    } else {
        switch(s->state) {
        case RS_IDLE:
            if (ch == '$') {
                s->line_buf_index = 0;
                s->state = RS_GETLINE;
            }
            break;
        case RS_GETLINE:
            if (ch == '#') {
            s->state = RS_CHKSUM1;
            } else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
                s->state = RS_IDLE;
            } else {
            s->line_buf[s->line_buf_index++] = ch;
            }
            break;
        case RS_CHKSUM1:
            s->line_buf[s->line_buf_index] = '\0';
            s->line_csum = fromhex(ch) << 4;
            s->state = RS_CHKSUM2;
            break;
        case RS_CHKSUM2:
            s->line_csum |= fromhex(ch);
            csum = 0;
            for(i = 0; i < s->line_buf_index; i++) {
                csum += s->line_buf[i];
            }
            if (s->line_csum != (csum & 0xff)) {
                reply[0] = '-';
                put_buffer(s, reply, 1);
                s->state = RS_IDLE;
            } else {
                reply[0] = '+';
                put_buffer(s, reply, 1);
                s->state = gdb_handle_packet(s, s->line_buf);
            }
            break;
        }
    }
}

static int gdb_can_read(void *opaque)
{
    return 256;
}

static void gdb_read(void *opaque, const uint8_t *buf, int size)
{
    GDBState *s = opaque;
    int i;
    if (size == 0) {
        /* end of connection */
        qemu_del_vm_stop_handler(gdb_vm_stopped, s);
        qemu_del_fd_read_handler(s->fd);
        qemu_free(s);
        vm_start();
    } else {
        for(i = 0; i < size; i++)
            gdb_read_byte(s, buf[i]);
    }
}

static void gdb_accept(void *opaque, const uint8_t *buf, int size)
{
    GDBState *s;
    struct sockaddr_in sockaddr;
    socklen_t len;
    int val, fd;

    for(;;) {
        len = sizeof(sockaddr);
        fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
        if (fd < 0 && errno != EINTR) {
            perror("accept");
            return;
        } else if (fd >= 0) {
            break;
        }
    }

    /* set short latency */
    val = 1;
    setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
    
    s = qemu_mallocz(sizeof(GDBState));
    if (!s) {
        close(fd);
        return;
    }
    s->fd = fd;

    fcntl(fd, F_SETFL, O_NONBLOCK);

    /* stop the VM */
    vm_stop(EXCP_INTERRUPT);

    /* start handling I/O */
    qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s);
    /* when the VM is stopped, the following callback is called */
    qemu_add_vm_stop_handler(gdb_vm_stopped, s);
}

static int gdbserver_open(int port)
{
    struct sockaddr_in sockaddr;
    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;
    }
    fcntl(fd, F_SETFL, O_NONBLOCK);
    return fd;
}

int gdbserver_start(int port)
{
    gdbserver_fd = gdbserver_open(port);
    if (gdbserver_fd < 0)
        return -1;
    /* accept connections */
    qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL);
    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	*/
67b915a5 FB	20	#include "vl.h"
67b915a5 FB	21
b4608c04 FB	22	#include <sys/socket.h>
	23	#include <netinet/in.h>
	24	#include <netinet/tcp.h>
	25	#include <signal.h>
b4608c04	26
4abe615b	27	//#define DEBUG_GDB
b4608c04	28
858693c6 FB	29	enum RSState {
	30	RS_IDLE,
	31	RS_GETLINE,
	32	RS_CHKSUM1,
	33	RS_CHKSUM2,
	34	};
b4608c04	35
858693c6	36	static int gdbserver_fd;
b4608c04	37
858693c6 FB	38	typedef struct GDBState {
	39	enum RSState state;
	40	int fd;
	41	char line_buf[4096];
	42	int line_buf_index;
	43	int line_csum;
	44	} GDBState;
b4608c04	45
858693c6	46	static int get_char(GDBState *s)
b4608c04 FB	47	{
	48	uint8_t ch;
	49	int ret;
	50
	51	for(;;) {
858693c6	52	ret = read(s->fd, &ch, 1);
b4608c04 FB	53	if (ret < 0) {
	54	if (errno != EINTR && errno != EAGAIN)
	55	return -1;
	56	} else if (ret == 0) {
	57	return -1;
	58	} else {
	59	break;
	60	}
	61	}
	62	return ch;
	63	}
	64
858693c6	65	static void put_buffer(GDBState s, const uint8_t buf, int len)
b4608c04 FB	66	{
	67	int ret;
	68
	69	while (len > 0) {
858693c6	70	ret = write(s->fd, buf, len);
b4608c04 FB	71	if (ret < 0) {
	72	if (errno != EINTR && errno != EAGAIN)
	73	return;
	74	} else {
	75	buf += ret;
	76	len -= ret;
	77	}
	78	}
	79	}
	80
	81	static inline int fromhex(int v)
	82	{
	83	if (v >= '0' && v <= '9')
	84	return v - '0';
	85	else if (v >= 'A' && v <= 'F')
	86	return v - 'A' + 10;
	87	else if (v >= 'a' && v <= 'f')
	88	return v - 'a' + 10;
	89	else
	90	return 0;
	91	}
	92
	93	static inline int tohex(int v)
	94	{
	95	if (v < 10)
	96	return v + '0';
	97	else
	98	return v - 10 + 'a';
	99	}
	100
	101	static void memtohex(char buf, const uint8_t mem, int len)
	102	{
	103	int i, c;
	104	char *q;
	105	q = buf;
	106	for(i = 0; i < len; i++) {
	107	c = mem[i];
	108	*q++ = tohex(c >> 4);
	109	*q++ = tohex(c & 0xf);
	110	}
	111	*q = '\0';
	112	}
	113
	114	static void hextomem(uint8_t mem, const char buf, int len)
	115	{
	116	int i;
	117
	118	for(i = 0; i < len; i++) {
	119	mem[i] = (fromhex(buf[0]) << 4) \| fromhex(buf[1]);
	120	buf += 2;
	121	}
	122	}
	123
b4608c04	124	/* return -1 if error, 0 if OK */
858693c6	125	static int put_packet(GDBState s, char buf)
b4608c04 FB	126	{
	127	char buf1[3];
	128	int len, csum, ch, i;
	129
	130	#ifdef DEBUG_GDB
	131	printf("reply='%s'\n", buf);
	132	#endif
	133
	134	for(;;) {
	135	buf1[0] = '$';
858693c6	136	put_buffer(s, buf1, 1);
b4608c04	137	len = strlen(buf);
858693c6	138	put_buffer(s, buf, len);
b4608c04 FB	139	csum = 0;
	140	for(i = 0; i < len; i++) {
	141	csum += buf[i];
	142	}
	143	buf1[0] = '#';
	144	buf1[1] = tohex((csum >> 4) & 0xf);
	145	buf1[2] = tohex((csum) & 0xf);
	146
858693c6	147	put_buffer(s, buf1, 3);
b4608c04	148
858693c6	149	ch = get_char(s);
b4608c04 FB	150	if (ch < 0)
	151	return -1;
	152	if (ch == '+')
	153	break;
	154	}
	155	return 0;
	156	}
	157
6da41eaf FB	158	#if defined(TARGET_I386)
6da41eaf FB	159
6da41eaf FB	160	static int cpu_gdb_read_registers(CPUState env, uint8_t mem_buf)
6da41eaf FB	161	{
e95c8d51	162	uint32_t registers = (uint32_t )mem_buf;
6da41eaf FB	163	int i, fpus;
	164
	165	for(i = 0; i < 8; i++) {
e95c8d51	166	registers[i] = env->regs[i];
6da41eaf	167	}
e95c8d51 FB	168	registers[8] = env->eip;
	169	registers[9] = env->eflags;
	170	registers[10] = env->segs[R_CS].selector;
	171	registers[11] = env->segs[R_SS].selector;
	172	registers[12] = env->segs[R_DS].selector;
	173	registers[13] = env->segs[R_ES].selector;
	174	registers[14] = env->segs[R_FS].selector;
	175	registers[15] = env->segs[R_GS].selector;
6da41eaf FB	176	/* XXX: convert floats */
	177	for(i = 0; i < 8; i++) {
	178	memcpy(mem_buf + 16 * 4 + i * 10, &env->fpregs[i], 10);
	179	}
e95c8d51	180	registers[36] = env->fpuc;
6da41eaf	181	fpus = (env->fpus & ~0x3800) \| (env->fpstt & 0x7) << 11;
e95c8d51 FB	182	registers[37] = fpus;
	183	registers[38] = 0; /* XXX: convert tags */
	184	registers[39] = 0; /* fiseg */
	185	registers[40] = 0; /* fioff */
	186	registers[41] = 0; /* foseg */
	187	registers[42] = 0; /* fooff */
	188	registers[43] = 0; /* fop */
	189
	190	for(i = 0; i < 16; i++)
	191	tswapls(&registers[i]);
	192	for(i = 36; i < 44; i++)
	193	tswapls(&registers[i]);
6da41eaf FB	194	return 44 * 4;
	195	}
	196
	197	static void cpu_gdb_write_registers(CPUState env, uint8_t mem_buf, int size)
	198	{
	199	uint32_t registers = (uint32_t )mem_buf;
	200	int i;
	201
	202	for(i = 0; i < 8; i++) {
	203	env->regs[i] = tswapl(registers[i]);
	204	}
e95c8d51 FB	205	env->eip = tswapl(registers[8]);
e95c8d51 FB	206	env->eflags = tswapl(registers[9]);
6da41eaf FB	207	#if defined(CONFIG_USER_ONLY)
	208	#define LOAD_SEG(index, sreg)\
	209	if (tswapl(registers[index]) != env->segs[sreg].selector)\
	210	cpu_x86_load_seg(env, sreg, tswapl(registers[index]));
	211	LOAD_SEG(10, R_CS);
	212	LOAD_SEG(11, R_SS);
	213	LOAD_SEG(12, R_DS);
	214	LOAD_SEG(13, R_ES);
	215	LOAD_SEG(14, R_FS);
	216	LOAD_SEG(15, R_GS);
	217	#endif
	218	}
	219
9e62fd7f	220	#elif defined (TARGET_PPC)
a541f297 FB	221	static uint32_t from_le32 (uint32_t *buf)
	222	{
	223	uint8_t p = (uint8_t )buf;
	224
	225	return p[0] \| (p[1] << 8) \| (p[2] << 16) \| (p[3] << 24);
	226	}
	227
9e62fd7f FB	228	static int cpu_gdb_read_registers(CPUState env, uint8_t mem_buf)
9e62fd7f FB	229	{
a541f297	230	uint32_t registers = (uint32_t )mem_buf, tmp;
9e62fd7f FB	231	int i;
	232
	233	/* fill in gprs */
a541f297	234	for(i = 0; i < 32; i++) {
e95c8d51	235	registers[i] = tswapl(env->gpr[i]);
9e62fd7f FB	236	}
	237	/* fill in fprs */
	238	for (i = 0; i < 32; i++) {
e95c8d51 FB	239	registers[(i * 2) + 32] = tswapl(((uint32_t )&env->fpr[i]));
e95c8d51 FB	240	registers[(i * 2) + 33] = tswapl(((uint32_t )&env->fpr[i] + 1));
9e62fd7f FB	241	}
9e62fd7f FB	242	/* nip, msr, ccr, lnk, ctr, xer, mq */
e95c8d51 FB	243	registers[96] = tswapl(env->nip);
e95c8d51 FB	244	registers[97] = tswapl(_load_msr(env));
9e62fd7f FB	245	tmp = 0;
9e62fd7f FB	246	for (i = 0; i < 8; i++)
a541f297	247	tmp \|= env->crf[i] << (32 - ((i + 1) * 4));
e95c8d51 FB	248	registers[98] = tswapl(tmp);
	249	registers[99] = tswapl(env->lr);
	250	registers[100] = tswapl(env->ctr);
	251	registers[101] = tswapl(_load_xer(env));
	252	registers[102] = 0;
a541f297 FB	253
a541f297 FB	254	return 103 * 4;
9e62fd7f FB	255	}
	256
	257	static void cpu_gdb_write_registers(CPUState env, uint8_t mem_buf, int size)
	258	{
	259	uint32_t registers = (uint32_t )mem_buf;
	260	int i;
	261
	262	/* fill in gprs */
	263	for (i = 0; i < 32; i++) {
e95c8d51	264	env->gpr[i] = tswapl(registers[i]);
9e62fd7f FB	265	}
	266	/* fill in fprs */
	267	for (i = 0; i < 32; i++) {
e95c8d51 FB	268	((uint32_t )&env->fpr[i]) = tswapl(registers[(i * 2) + 32]);
e95c8d51 FB	269	((uint32_t )&env->fpr[i] + 1) = tswapl(registers[(i * 2) + 33]);
9e62fd7f FB	270	}
9e62fd7f FB	271	/* nip, msr, ccr, lnk, ctr, xer, mq */
e95c8d51 FB	272	env->nip = tswapl(registers[96]);
	273	_store_msr(env, tswapl(registers[97]));
	274	registers[98] = tswapl(registers[98]);
9e62fd7f	275	for (i = 0; i < 8; i++)
a541f297	276	env->crf[i] = (registers[98] >> (32 - ((i + 1) * 4))) & 0xF;
e95c8d51 FB	277	env->lr = tswapl(registers[99]);
	278	env->ctr = tswapl(registers[100]);
	279	_store_xer(env, tswapl(registers[101]));
	280	}
	281	#elif defined (TARGET_SPARC)
	282	static int cpu_gdb_read_registers(CPUState env, uint8_t mem_buf)
	283	{
	284	uint32_t registers = (uint32_t )mem_buf, tmp;
	285	int i;
	286
	287	/* fill in g0..g7 */
	288	for(i = 0; i < 7; i++) {
	289	registers[i] = tswapl(env->gregs[i]);
	290	}
	291	/* fill in register window */
	292	for(i = 0; i < 24; i++) {
	293	registers[i + 8] = tswapl(env->regwptr[i]);
	294	}
	295	/* fill in fprs */
	296	for (i = 0; i < 32; i++) {
	297	registers[i + 32] = tswapl(((uint32_t )&env->fpr[i]));
	298	}
	299	/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
	300	registers[64] = tswapl(env->y);
e80cfcfc	301	tmp = GET_PSR(env);
e95c8d51 FB	302	registers[65] = tswapl(tmp);
	303	registers[66] = tswapl(env->wim);
	304	registers[67] = tswapl(env->tbr);
	305	registers[68] = tswapl(env->pc);
	306	registers[69] = tswapl(env->npc);
	307	registers[70] = tswapl(env->fsr);
	308	registers[71] = 0; /* csr */
	309	registers[72] = 0;
	310
	311	return 73 * 4;
	312	}
	313
	314	static void cpu_gdb_write_registers(CPUState env, uint8_t mem_buf, int size)
	315	{
e80cfcfc	316	uint32_t registers = (uint32_t )mem_buf;
e95c8d51 FB	317	int i;
	318
	319	/* fill in g0..g7 */
	320	for(i = 0; i < 7; i++) {
	321	env->gregs[i] = tswapl(registers[i]);
	322	}
	323	/* fill in register window */
	324	for(i = 0; i < 24; i++) {
	325	env->regwptr[i] = tswapl(registers[i]);
	326	}
	327	/* fill in fprs */
	328	for (i = 0; i < 32; i++) {
	329	((uint32_t )&env->fpr[i]) = tswapl(registers[i + 32]);
	330	}
	331	/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
	332	env->y = tswapl(registers[64]);
e80cfcfc	333	PUT_PSR(env, tswapl(registers[65]));
e95c8d51 FB	334	env->wim = tswapl(registers[66]);
	335	env->tbr = tswapl(registers[67]);
	336	env->pc = tswapl(registers[68]);
	337	env->npc = tswapl(registers[69]);
	338	env->fsr = tswapl(registers[70]);
9e62fd7f	339	}
6da41eaf FB	340	#else
	341
	342	static int cpu_gdb_read_registers(CPUState env, uint8_t mem_buf)
	343	{
	344	return 0;
	345	}
	346
	347	static void cpu_gdb_write_registers(CPUState env, uint8_t mem_buf, int size)
	348	{
	349	}
	350
	351	#endif
b4608c04 FB	352
b4608c04 FB	353	/* port = 0 means default port */
858693c6	354	static int gdb_handle_packet(GDBState s, const char line_buf)
b4608c04	355	{
858693c6	356	CPUState *env = cpu_single_env;
b4608c04	357	const char *p;
858693c6	358	int ch, reg_size, type;
b4608c04 FB	359	char buf[4096];
	360	uint8_t mem_buf[2000];
	361	uint32_t *registers;
	362	uint32_t addr, len;
	363
858693c6 FB	364	#ifdef DEBUG_GDB
	365	printf("command='%s'\n", line_buf);
	366	#endif
	367	p = line_buf;
	368	ch = *p++;
	369	switch(ch) {
	370	case '?':
	371	snprintf(buf, sizeof(buf), "S%02x", SIGTRAP);
	372	put_packet(s, buf);
	373	break;
	374	case 'c':
	375	if (*p != '\0') {
	376	addr = strtoul(p, (char **)&p, 16);
4c3a88a2	377	#if defined(TARGET_I386)
858693c6	378	env->eip = addr;
5be1a8e0	379	#elif defined (TARGET_PPC)
858693c6	380	env->nip = addr;
8d5f07fa FB	381	#elif defined (TARGET_SPARC)
	382	env->pc = addr;
	383	env->npc = addr + 4;
4c3a88a2	384	#endif
858693c6 FB	385	}
	386	vm_start();
	387	break;
	388	case 's':
	389	if (*p != '\0') {
	390	addr = strtoul(p, (char **)&p, 16);
c33a346e	391	#if defined(TARGET_I386)
858693c6	392	env->eip = addr;
5be1a8e0	393	#elif defined (TARGET_PPC)
858693c6	394	env->nip = addr;
8d5f07fa FB	395	#elif defined (TARGET_SPARC)
	396	env->pc = addr;
	397	env->npc = addr + 4;
c33a346e	398	#endif
858693c6 FB	399	}
	400	cpu_single_step(env, 1);
	401	vm_start();
	402	break;
	403	case 'g':
	404	reg_size = cpu_gdb_read_registers(env, mem_buf);
	405	memtohex(buf, mem_buf, reg_size);
	406	put_packet(s, buf);
	407	break;
	408	case 'G':
	409	registers = (void *)mem_buf;
	410	len = strlen(p) / 2;
	411	hextomem((uint8_t *)registers, p, len);
	412	cpu_gdb_write_registers(env, mem_buf, len);
	413	put_packet(s, "OK");
	414	break;
	415	case 'm':
	416	addr = strtoul(p, (char **)&p, 16);
	417	if (*p == ',')
	418	p++;
	419	len = strtoul(p, NULL, 16);
	420	if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0)
	421	memset(mem_buf, 0, len);
	422	memtohex(buf, mem_buf, len);
	423	put_packet(s, buf);
	424	break;
	425	case 'M':
	426	addr = strtoul(p, (char **)&p, 16);
	427	if (*p == ',')
	428	p++;
	429	len = strtoul(p, (char **)&p, 16);
	430	if (*p == ',')
	431	p++;
	432	hextomem(mem_buf, p, len);
	433	if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
	434	put_packet(s, "ENN");
	435	else
	436	put_packet(s, "OK");
	437	break;
	438	case 'Z':
	439	type = strtoul(p, (char **)&p, 16);
	440	if (*p == ',')
	441	p++;
	442	addr = strtoul(p, (char **)&p, 16);
	443	if (*p == ',')
	444	p++;
	445	len = strtoul(p, (char **)&p, 16);
	446	if (type == 0 \|\| type == 1) {
	447	if (cpu_breakpoint_insert(env, addr) < 0)
	448	goto breakpoint_error;
	449	put_packet(s, "OK");
	450	} else {
	451	breakpoint_error:
	452	put_packet(s, "ENN");
	453	}
	454	break;
	455	case 'z':
	456	type = strtoul(p, (char **)&p, 16);
	457	if (*p == ',')
	458	p++;
	459	addr = strtoul(p, (char **)&p, 16);
	460	if (*p == ',')
	461	p++;
	462	len = strtoul(p, (char **)&p, 16);
463	if (type == 0 \|\| type == 1) {
464	cpu_breakpoint_remove(env, addr);
465	put_packet(s, "OK");
466	} else {
467	goto breakpoint_error;
468	}
469	break;
470	default:
471	// unknown_command:
472	/* put empty packet */
473	buf[0] = '\0';
474	put_packet(s, buf);
475	break;
476	}
477	return RS_IDLE;
478	}
479
480	static void gdb_vm_stopped(void *opaque, int reason)
481	{
482	GDBState *s = opaque;
483	char buf[256];
484	int ret;
485
486	/* disable single step if it was enable */
487	cpu_single_step(cpu_single_env, 0);
488
e80cfcfc FB	489	if (reason == EXCP_DEBUG) {
e80cfcfc FB	490	tb_flush(cpu_single_env);
858693c6	491	ret = SIGTRAP;
e80cfcfc	492	}
858693c6 FB	493	else
	494	ret = 0;
	495	snprintf(buf, sizeof(buf), "S%02x", ret);
	496	put_packet(s, buf);
	497	}
	498
	499	static void gdb_read_byte(GDBState *s, int ch)
	500	{
	501	int i, csum;
	502	char reply[1];
	503
	504	if (vm_running) {
	505	/* when the CPU is running, we cannot do anything except stop
	506	it when receiving a char */
	507	vm_stop(EXCP_INTERRUPT);
	508	} else {
	509	switch(s->state) {
	510	case RS_IDLE:
	511	if (ch == '$') {
	512	s->line_buf_index = 0;
	513	s->state = RS_GETLINE;
c33a346e	514	}
b4608c04	515	break;
858693c6 FB	516	case RS_GETLINE:
	517	if (ch == '#') {
	518	s->state = RS_CHKSUM1;
	519	} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) {
	520	s->state = RS_IDLE;
4c3a88a2	521	} else {
858693c6	522	s->line_buf[s->line_buf_index++] = ch;
4c3a88a2 FB	523	}
4c3a88a2 FB	524	break;
858693c6 FB	525	case RS_CHKSUM1:
	526	s->line_buf[s->line_buf_index] = '\0';
	527	s->line_csum = fromhex(ch) << 4;
	528	s->state = RS_CHKSUM2;
	529	break;
	530	case RS_CHKSUM2:
	531	s->line_csum \|= fromhex(ch);
	532	csum = 0;
	533	for(i = 0; i < s->line_buf_index; i++) {
	534	csum += s->line_buf[i];
	535	}
	536	if (s->line_csum != (csum & 0xff)) {
	537	reply[0] = '-';
	538	put_buffer(s, reply, 1);
	539	s->state = RS_IDLE;
4c3a88a2	540	} else {
858693c6 FB	541	reply[0] = '+';
	542	put_buffer(s, reply, 1);
	543	s->state = gdb_handle_packet(s, s->line_buf);
4c3a88a2 FB	544	}
4c3a88a2 FB	545	break;
858693c6 FB	546	}
	547	}
	548	}
	549
	550	static int gdb_can_read(void *opaque)
	551	{
	552	return 256;
	553	}
	554
	555	static void gdb_read(void opaque, const uint8_t buf, int size)
	556	{
	557	GDBState *s = opaque;
	558	int i;
	559	if (size == 0) {
	560	/* end of connection */
	561	qemu_del_vm_stop_handler(gdb_vm_stopped, s);
	562	qemu_del_fd_read_handler(s->fd);
	563	qemu_free(s);
	564	vm_start();
	565	} else {
	566	for(i = 0; i < size; i++)
	567	gdb_read_byte(s, buf[i]);
	568	}
	569	}
	570
	571	static void gdb_accept(void opaque, const uint8_t buf, int size)
	572	{
	573	GDBState *s;
	574	struct sockaddr_in sockaddr;
	575	socklen_t len;
	576	int val, fd;
	577
	578	for(;;) {
	579	len = sizeof(sockaddr);
	580	fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
	581	if (fd < 0 && errno != EINTR) {
	582	perror("accept");
	583	return;
	584	} else if (fd >= 0) {
b4608c04 FB	585	break;
	586	}
	587	}
858693c6 FB	588
	589	/* set short latency */
	590	val = 1;
7d3505c5	591	setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
858693c6 FB	592
	593	s = qemu_mallocz(sizeof(GDBState));
	594	if (!s) {
	595	close(fd);
	596	return;
	597	}
	598	s->fd = fd;
	599
	600	fcntl(fd, F_SETFL, O_NONBLOCK);
	601
	602	/* stop the VM */
	603	vm_stop(EXCP_INTERRUPT);
	604
	605	/* start handling I/O */
	606	qemu_add_fd_read_handler(s->fd, gdb_can_read, gdb_read, s);
	607	/* when the VM is stopped, the following callback is called */
	608	qemu_add_vm_stop_handler(gdb_vm_stopped, s);
	609	}
	610
	611	static int gdbserver_open(int port)
	612	{
	613	struct sockaddr_in sockaddr;
	614	int fd, val, ret;
	615
	616	fd = socket(PF_INET, SOCK_STREAM, 0);
	617	if (fd < 0) {
	618	perror("socket");
	619	return -1;
	620	}
	621
	622	/* allow fast reuse */
	623	val = 1;
	624	setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
	625
	626	sockaddr.sin_family = AF_INET;
	627	sockaddr.sin_port = htons(port);
	628	sockaddr.sin_addr.s_addr = 0;
	629	ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr));
	630	if (ret < 0) {
	631	perror("bind");
	632	return -1;
	633	}
	634	ret = listen(fd, 0);
	635	if (ret < 0) {
	636	perror("listen");
	637	return -1;
	638	}
	639	fcntl(fd, F_SETFL, O_NONBLOCK);
	640	return fd;
	641	}
	642
	643	int gdbserver_start(int port)
	644	{
	645	gdbserver_fd = gdbserver_open(port);
	646	if (gdbserver_fd < 0)
	647	return -1;
	648	/* accept connections */
	649	qemu_add_fd_read_handler(gdbserver_fd, NULL, gdb_accept, NULL);
b4608c04 FB	650	return 0;
b4608c04 FB	651	}