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/*
* 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 <arch/cache.h>
#include <gdb.h>
#include <libpayload.h>
static void gdb_get_last_signal(struct gdb_message *command,
int offset, struct gdb_message *reply)
{
gdb_message_add_string(reply, "S");
gdb_message_encode_bytes(reply, &gdb_state.signal, 1);
}
static void gdb_read_general_registers(struct gdb_message *command,
int offset, struct gdb_message *reply)
{
gdb_arch_encode_regs(reply);
}
static void gdb_write_general_registers(struct gdb_message *command,
int offset, struct gdb_message *reply)
{
gdb_arch_decode_regs(offset, command);
gdb_message_add_string(reply, "OK");
}
static void gdb_read_memory(struct gdb_message *command,
int offset, struct gdb_message *reply)
{
int tok = gdb_message_tokenize(command, &offset);
uintptr_t addr = gdb_message_decode_int(command, tok, offset - 1 - tok);
size_t length = gdb_message_decode_int(command, offset,
command->used - offset);
gdb_message_encode_bytes(reply, (void *)addr, length);
}
static void gdb_write_memory(struct gdb_message *command,
int offset, struct gdb_message *reply)
{
int tok = gdb_message_tokenize(command, &offset);
uintptr_t addr = gdb_message_decode_int(command, tok, offset - 1 - tok);
tok = gdb_message_tokenize(command, &offset);
size_t length = gdb_message_decode_int(command, tok, offset - 1 - tok);
die_if(length * 2 != command->used - offset, "Invalid length field in "
"GDB command: %.*s", command->used, command->buf);
gdb_message_decode_bytes(command, offset, (void *)addr, length);
cache_sync_instructions();
gdb_message_add_string(reply, "OK");
}
static void gdb_continue(struct gdb_message *command,
int offset, struct gdb_message *reply)
{
/* Disable single step if it's still on. */
gdb_arch_set_single_step(0);
/* No need to support the extension that passes in new EIP/PC. */
if (command->used > offset)
gdb_message_add_string(reply, "E00");
else
gdb_state.resumed = 1;
}
static void gdb_single_step(struct gdb_message *command,
int offset, struct gdb_message *reply)
{
if (command->used > offset || gdb_arch_set_single_step(1))
gdb_message_add_string(reply, "E00");
else
gdb_state.resumed = 1;
}
struct gdb_command gdb_commands[] = {
{ "?", &gdb_get_last_signal },
{ "g", &gdb_read_general_registers },
{ "G", &gdb_write_general_registers },
{ "m", &gdb_read_memory },
{ "M", &gdb_write_memory },
{ "c", &gdb_continue },
{ "s", &gdb_single_step }
};
const int gdb_command_count = ARRAY_SIZE(gdb_commands);
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