98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/*
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* Copyright 2014 Google Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but without any warranty; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <arch/cache.h>
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#include <gdb.h>
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#include <libpayload.h>
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static void gdb_get_last_signal(struct gdb_message *command,
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int offset, struct gdb_message *reply)
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{
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gdb_message_add_string(reply, "S");
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gdb_message_encode_bytes(reply, &gdb_state.signal, 1);
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}
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static void gdb_read_general_registers(struct gdb_message *command,
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int offset, struct gdb_message *reply)
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{
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gdb_arch_encode_regs(reply);
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}
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static void gdb_write_general_registers(struct gdb_message *command,
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int offset, struct gdb_message *reply)
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{
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gdb_arch_decode_regs(offset, command);
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gdb_message_add_string(reply, "OK");
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}
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static void gdb_read_memory(struct gdb_message *command,
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int offset, struct gdb_message *reply)
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{
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int tok = gdb_message_tokenize(command, &offset);
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uintptr_t addr = gdb_message_decode_int(command, tok, offset - 1 - tok);
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size_t length = gdb_message_decode_int(command, offset,
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command->used - offset);
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gdb_message_encode_bytes(reply, (void *)addr, length);
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}
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static void gdb_write_memory(struct gdb_message *command,
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int offset, struct gdb_message *reply)
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{
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int tok = gdb_message_tokenize(command, &offset);
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uintptr_t addr = gdb_message_decode_int(command, tok, offset - 1 - tok);
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tok = gdb_message_tokenize(command, &offset);
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size_t length = gdb_message_decode_int(command, tok, offset - 1 - tok);
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die_if(length * 2 != command->used - offset, "Invalid length field in "
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"GDB command: %.*s", command->used, command->buf);
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gdb_message_decode_bytes(command, offset, (void *)addr, length);
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cache_sync_instructions();
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gdb_message_add_string(reply, "OK");
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}
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static void gdb_continue(struct gdb_message *command,
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int offset, struct gdb_message *reply)
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{
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/* Disable single step if it's still on. */
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gdb_arch_set_single_step(0);
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/* No need to support the extension that passes in new EIP/PC. */
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if (command->used > offset)
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gdb_message_add_string(reply, "E00");
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else
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gdb_state.resumed = 1;
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}
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static void gdb_single_step(struct gdb_message *command,
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int offset, struct gdb_message *reply)
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{
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if (command->used > offset || gdb_arch_set_single_step(1))
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gdb_message_add_string(reply, "E00");
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else
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gdb_state.resumed = 1;
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}
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struct gdb_command gdb_commands[] = {
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{ "?", &gdb_get_last_signal },
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{ "g", &gdb_read_general_registers },
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{ "G", &gdb_write_general_registers },
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{ "m", &gdb_read_memory },
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{ "M", &gdb_write_memory },
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{ "c", &gdb_continue },
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{ "s", &gdb_single_step }
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};
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const int gdb_command_count = ARRAY_SIZE(gdb_commands);
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