121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/*
|
|
* Copyright 2014 Google Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*/
|
|
|
|
#include <gdb.h>
|
|
#include <libpayload.h>
|
|
|
|
struct gdb_state gdb_state;
|
|
|
|
static u8 reply_buf[2048];
|
|
static u8 command_buf[2048];
|
|
|
|
static struct gdb_message command = {
|
|
.buf = command_buf,
|
|
.used = 0,
|
|
.size = sizeof(command_buf),
|
|
};
|
|
static struct gdb_message reply = {
|
|
.buf = reply_buf,
|
|
.used = 0,
|
|
.size = sizeof(reply_buf),
|
|
};
|
|
|
|
void gdb_command_loop(u8 signal)
|
|
{
|
|
if (gdb_state.resumed) {
|
|
/* We were just running. Send a stop reply. */
|
|
reply.used = 0;
|
|
gdb_message_add_string(&reply, "S");
|
|
gdb_message_encode_bytes(&reply, &signal, 1);
|
|
gdb_send_reply(&reply);
|
|
|
|
}
|
|
gdb_state.signal = signal;
|
|
gdb_state.resumed = 0;
|
|
gdb_state.connected = 1;
|
|
|
|
while (1) {
|
|
int i;
|
|
|
|
gdb_get_command(&command);
|
|
|
|
reply.used = 0;
|
|
for (i = 0; i < gdb_command_count; i++) {
|
|
int clen = strlen(gdb_commands[i].str);
|
|
if (!strncmp(gdb_commands[i].str, (char *)command.buf,
|
|
MIN(clen, command.used))) {
|
|
gdb_commands[i].handler(&command, clen, &reply);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* If we're resuming, we won't send a reply until we stop. */
|
|
if (gdb_state.resumed)
|
|
return;
|
|
|
|
gdb_send_reply(&reply);
|
|
}
|
|
}
|
|
|
|
static void gdb_output_write(const void *buffer, size_t count)
|
|
{
|
|
if (!gdb_state.resumed) {
|
|
/* Must be a die_if() in GDB (or a bug), so bail out and die. */
|
|
gdb_exit(-1);
|
|
video_console_init();
|
|
puts("GDB died, redirecting its last words to the screen:\n");
|
|
console_write(buffer, count);
|
|
} else {
|
|
reply.used = 0;
|
|
reply.buf[reply.used++] = 'O';
|
|
gdb_message_encode_bytes(&reply, buffer, count);
|
|
gdb_send_reply(&reply);
|
|
}
|
|
}
|
|
|
|
static struct console_output_driver gdb_output_driver = {
|
|
.write = &gdb_output_write
|
|
};
|
|
|
|
static void gdb_init(void)
|
|
{
|
|
printf("Ready for GDB connection.\n");
|
|
gdb_transport_init();
|
|
gdb_arch_init();
|
|
console_add_output_driver(&gdb_output_driver);
|
|
}
|
|
|
|
void gdb_enter(void)
|
|
{
|
|
if (!gdb_state.connected)
|
|
gdb_init();
|
|
gdb_arch_enter();
|
|
}
|
|
|
|
void gdb_exit(s8 exit_status)
|
|
{
|
|
if (!gdb_state.connected)
|
|
return;
|
|
|
|
reply.used = 0;
|
|
gdb_message_add_string(&reply, "W");
|
|
gdb_message_encode_bytes(&reply, &exit_status, 1);
|
|
gdb_send_reply(&reply);
|
|
|
|
console_remove_output_driver(&gdb_output_write);
|
|
gdb_transport_teardown();
|
|
gdb_state.connected = 0;
|
|
printf("Detached from GDB connection.\n");
|
|
}
|