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gdbstub: change GDBState.last_packet to GByteArray 

Remove the packet size upper limit by using a GByteArray
instead of a statically allocated array for last_packet.
Thus we can now send big packets.

Also remove the last_packet_len field and use last_packet->len
instead.

Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20191211160514.58373-2-damien.hedde@greensocs.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200316172155.971-27-alex.bennee@linaro.org>
This commit is contained in:
Damien Hedde 2020-03-16 17:21:53 +00:00 committed by Alex Bennée
parent f4a23e1797
commit d116e813a5
1 changed files with 21 additions and 18 deletions
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39
gdbstub.c
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@ -351,8 +351,7 @@ typedef struct GDBState {
int line_buf_index;
int line_sum; /* running checksum */
int line_csum; /* checksum at the end of the packet */
uint8_t last_packet[MAX_PACKET_LENGTH + 4];
int last_packet_len;
GByteArray *last_packet;
int signal;
#ifdef CONFIG_USER_ONLY
int fd;
@ -384,6 +383,7 @@ static void init_gdbserver_state(void)
gdbserver_state.init = true;
gdbserver_state.str_buf = g_string_new(NULL);
gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH);
gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4);
}
#ifndef CONFIG_USER_ONLY
@ -626,28 +626,29 @@ static void hexdump(const char *buf, int len,
static int put_packet_binary(const char *buf, int len, bool dump)
{
int csum, i;
uint8_t *p;
uint8_t *ps = &gdbserver_state.last_packet[0];
uint8_t footer[3];
if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) {
hexdump(buf, len, trace_gdbstub_io_binaryreply);
}
for(;;) {
p = ps;
*(p++) = '$';
memcpy(p, buf, len);
p += len;
g_byte_array_set_size(gdbserver_state.last_packet, 0);
g_byte_array_append(gdbserver_state.last_packet,
(const uint8_t *) "$", 1);
g_byte_array_append(gdbserver_state.last_packet,
(const uint8_t *) buf, len);
csum = 0;
for(i = 0; i < len; i++) {
csum += buf[i];
}
*(p++) = '#';
*(p++) = tohex((csum >> 4) & 0xf);
*(p++) = tohex((csum) & 0xf);
footer[0] = '#';
footer[1] = tohex((csum >> 4) & 0xf);
footer[2] = tohex((csum) & 0xf);
g_byte_array_append(gdbserver_state.last_packet, footer, 3);
gdbserver_state.last_packet_len = p - ps;
put_buffer(ps, gdbserver_state.last_packet_len);
put_buffer(gdbserver_state.last_packet->data,
gdbserver_state.last_packet->len);
#ifdef CONFIG_USER_ONLY
i = get_char();
@ -2812,20 +2813,22 @@ static void gdb_read_byte(uint8_t ch)
uint8_t reply;
#ifndef CONFIG_USER_ONLY
if (gdbserver_state.last_packet_len) {
if (gdbserver_state.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 == '-') {
trace_gdbstub_err_got_nack();
put_buffer((uint8_t *)gdbserver_state.last_packet, gdbserver_state.last_packet_len);
put_buffer(gdbserver_state.last_packet->data,
gdbserver_state.last_packet->len);
} else if (ch == '+') {
trace_gdbstub_io_got_ack();
} else {
trace_gdbstub_io_got_unexpected(ch);
}
if (ch == '+' || ch == '$')
gdbserver_state.last_packet_len = 0;
if (ch == '+' || ch == '$') {
g_byte_array_set_size(gdbserver_state.last_packet, 0);
}
if (ch != '$')
return;
}
@ -3209,7 +3212,7 @@ static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len)
const char *p = (const char *)buf;
int max_sz;
max_sz = (sizeof(gdbserver_state.last_packet) - 2) / 2;
max_sz = (MAX_PACKET_LENGTH / 2) + 1;
for (;;) {
if (len <= max_sz) {
gdb_monitor_output(p, len);