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Use standard character device interface for gdbstub.

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2363 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
pbrook 2007-01-28 01:53:16 +00:00
parent f749998939
commit 4046d9130e
5 changed files with 119 additions and 79 deletions
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165
gdbstub.c
View File

@ -53,25 +53,28 @@ enum RSState {
RS_CHKSUM1,
RS_CHKSUM2,
};
/* XXX: This is not thread safe. Do we care? */
static int gdbserver_fd = -1;
typedef struct GDBState {
CPUState *env; /* current CPU */
enum RSState state; /* parsing state */
int fd;
char line_buf[4096];
int line_buf_index;
int line_csum;
char last_packet[4100];
int last_packet_len;
#ifdef CONFIG_USER_ONLY
int fd;
int running_state;
#else
CharDriverState *chr;
#endif
} GDBState;
#ifdef CONFIG_USER_ONLY
/* XXX: This is not thread safe. Do we care? */
static int gdbserver_fd = -1;
/* XXX: remove this hack. */
static GDBState gdbserver_state;
#endif
static int get_char(GDBState *s)
{
@ -91,9 +94,11 @@ static int get_char(GDBState *s)
}
return ch;
}
#endif
static void put_buffer(GDBState *s, const uint8_t *buf, int len)
{
#ifdef CONFIG_USER_ONLY
int ret;
while (len > 0) {
@ -106,6 +111,9 @@ static void put_buffer(GDBState *s, const uint8_t *buf, int len)
len -= ret;
}
}
#else
qemu_chr_write(s->chr, buf, len);
#endif
}
static inline int fromhex(int v)
@ -154,33 +162,39 @@ static void hextomem(uint8_t *mem, const char *buf, int len)
/* return -1 if error, 0 if OK */
static int put_packet(GDBState *s, char *buf)
{
char buf1[3];
int len, csum, ch, i;
int len, csum, i;
char *p;
#ifdef DEBUG_GDB
printf("reply='%s'\n", buf);
#endif
for(;;) {
buf1[0] = '$';
put_buffer(s, buf1, 1);
p = s->last_packet;
*(p++) = '$';
len = strlen(buf);
put_buffer(s, buf, len);
memcpy(p, buf, len);
p += 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);
*(p++) = '#';
*(p++) = tohex((csum >> 4) & 0xf);
*(p++) = tohex((csum) & 0xf);
put_buffer(s, buf1, 3);
s->last_packet_len = p - s->last_packet;
put_buffer(s, s->last_packet, s->last_packet_len);
ch = get_char(s);
if (ch < 0)
#ifdef CONFIG_USER_ONLY
i = get_char(s);
if (i < 0)
return -1;
if (ch == '+')
if (i == '+')
break;
#else
break;
#endif
}
return 0;
}
@ -864,6 +878,26 @@ static void gdb_read_byte(GDBState *s, int ch)
char reply[1];
#ifndef CONFIG_USER_ONLY
if (s->last_packet_len) {
/* Waiting for a response to the last packet. If we see the start
of a new command then abandon the previous response. */
if (ch == '-') {
#ifdef DEBUG_GDB
printf("Got NACK, retransmitting\n");
#endif
put_buffer(s, s->last_packet, s->last_packet_len);
}
#ifdef DEBUG_GDB
else if (ch == '+')
printf("Got ACK\n");
else
printf("Got '%c' when expecting ACK/NACK\n", ch);
#endif
if (ch == '+' || ch == '$')
s->last_packet_len = 0;
if (ch != '$')
return;
}
if (vm_running) {
/* when the CPU is running, we cannot do anything except stop
it when receiving a char */
@ -972,30 +1006,6 @@ void gdb_exit(CPUState *env, int code)
put_packet(s, buf);
}
#else
static void gdb_read(void *opaque)
{
GDBState *s = opaque;
int i, size;
uint8_t buf[4096];
size = recv(s->fd, buf, sizeof(buf), 0);
if (size < 0)
return;
if (size == 0) {
/* end of connection */
qemu_del_vm_stop_handler(gdb_vm_stopped, s);
qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
qemu_free(s);
if (autostart)
vm_start();
} else {
for(i = 0; i < size; i++)
gdb_read_byte(s, buf[i]);
}
}
#endif
static void gdb_accept(void *opaque)
{
@ -1019,32 +1029,12 @@ static void gdb_accept(void *opaque)
val = 1;
setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *)&val, sizeof(val));
#ifdef CONFIG_USER_ONLY
s = &gdbserver_state;
memset (s, 0, sizeof (GDBState));
#else
s = qemu_mallocz(sizeof(GDBState));
if (!s) {
close(fd);
return;
}
#endif
s->env = first_cpu; /* XXX: allow to change CPU */
s->fd = fd;
#ifdef CONFIG_USER_ONLY
fcntl(fd, F_SETFL, O_NONBLOCK);
#else
socket_set_nonblock(fd);
/* stop the VM */
vm_stop(EXCP_INTERRUPT);
/* start handling I/O */
qemu_set_fd_handler(s->fd, gdb_read, NULL, s);
/* when the VM is stopped, the following callback is called */
qemu_add_vm_stop_handler(gdb_vm_stopped, s);
#endif
}
static int gdbserver_open(int port)
@ -1075,9 +1065,6 @@ static int gdbserver_open(int port)
perror("listen");
return -1;
}
#ifndef CONFIG_USER_ONLY
socket_set_nonblock(fd);
#endif
return fd;
}
@ -1087,10 +1074,52 @@ int gdbserver_start(int port)
if (gdbserver_fd < 0)
return -1;
/* accept connections */
#ifdef CONFIG_USER_ONLY
gdb_accept (NULL);
#else
qemu_set_fd_handler(gdbserver_fd, gdb_accept, NULL, NULL);
#endif
return 0;
}
#else
static int gdb_chr_can_recieve(void *opaque)
{
return 1;
}
static void gdb_chr_recieve(void *opaque, const uint8_t *buf, int size)
{
GDBState *s = opaque;
int i;
for (i = 0; i < size; i++) {
gdb_read_byte(s, buf[i]);
}
}
static void gdb_chr_event(void *opaque, int event)
{
switch (event) {
case CHR_EVENT_RESET:
vm_stop(EXCP_INTERRUPT);
break;
default:
break;
}
}
int gdbserver_start(CharDriverState *chr)
{
GDBState *s;
if (!chr)
return -1;
s = qemu_mallocz(sizeof(GDBState));
if (!s) {
return -1;
}
s->env = first_cpu; /* XXX: allow to change CPU */
s->chr = chr;
qemu_chr_add_handlers(chr, gdb_chr_can_recieve, gdb_chr_recieve,
gdb_chr_event, s);
qemu_add_vm_stop_handler(gdb_vm_stopped, s);
return 0;
}
#endif

4
gdbstub.h
View File

@ -6,7 +6,9 @@
#ifdef CONFIG_USER_ONLY
int gdb_handlesig (CPUState *, int);
void gdb_exit(CPUState *, int);
#endif
int gdbserver_start(int);
#else
int gdbserver_start(CharDriverState *chr);
#endif
#endif

3
qemu-doc.texi
View File

@ -631,7 +631,8 @@ non graphical mode.
@item -s
Wait gdb connection to port 1234 (@pxref{gdb_usage}).
@item -p port
Change gdb connection port.
Change gdb connection port. @var{port} can be either a decimal number
to specify a TCP port, or a host device (same devices as the serial port).
@item -S
Do not start CPU at startup (you must type 'c' in the monitor).
@item -d

23
vl.c
View File

@ -6496,7 +6496,8 @@ static BOOL WINAPI qemu_ctrl_handler(DWORD type)
int main(int argc, char **argv)
{
#ifdef CONFIG_GDBSTUB
int use_gdbstub, gdbstub_port;
int use_gdbstub;
char gdbstub_port_name[128];
#endif
int i, cdrom_index;
int snapshot, linux_boot;
@ -6564,7 +6565,7 @@ int main(int argc, char **argv)
bios_size = BIOS_SIZE;
#ifdef CONFIG_GDBSTUB
use_gdbstub = 0;
gdbstub_port = DEFAULT_GDBSTUB_PORT;
sprintf(gdbstub_port_name, "%d", DEFAULT_GDBSTUB_PORT);
#endif
snapshot = 0;
nographic = 0;
@ -6808,7 +6809,7 @@ int main(int argc, char **argv)
use_gdbstub = 1;
break;
case QEMU_OPTION_p:
gdbstub_port = atoi(optarg);
pstrcpy(gdbstub_port_name, sizeof(gdbstub_port_name), optarg);
break;
#endif
case QEMU_OPTION_L:
@ -7216,13 +7217,19 @@ int main(int argc, char **argv)
#ifdef CONFIG_GDBSTUB
if (use_gdbstub) {
if (gdbserver_start(gdbstub_port) < 0) {
fprintf(stderr, "Could not open gdbserver socket on port %d\n",
gdbstub_port);
CharDriverState *chr;
int port;
port = atoi(gdbstub_port_name);
if (port != 0)
sprintf(gdbstub_port_name, "tcp::%d,nowait,nodelay,server", port);
chr = qemu_chr_open(gdbstub_port_name);
if (!chr) {
fprintf(stderr, "qemu: could not open gdbstub device '%s'\n",
gdbstub_port_name);
exit(1);
} else {
printf("Waiting gdb connection on port %d\n", gdbstub_port);
}
gdbserver_start(chr);
} else
#endif
if (loadvm)

3
vl.h
View File

@ -84,7 +84,6 @@ static inline char *realpath(const char *path, char *resolved_path)
#include "audio/audio.h"
#include "cpu.h"
#include "gdbstub.h"
#endif /* !defined(QEMU_TOOL) */
@ -1364,6 +1363,8 @@ pflash_t *pflash_register (target_ulong base, ram_addr_t off,
uint16_t id0, uint16_t id1,
uint16_t id2, uint16_t id3);
#include "gdbstub.h"
#endif /* defined(QEMU_TOOL) */
/* monitor.c */