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The new monitor component at os/src/monitor is the designated successor of the gdb_monitor. This initial version, however, implements only the subset needed to inspect the memory of the monitored component(s). In contrast to the gdb_monitor, the new component supports the monitoring of multiple components, leveraging the sandbox API. It can therefore be used as a drop-in replacement for the init component. Like the gdb_monitor, the new monitor speaks the GDB protocol over Genode's terminal session. But the protocol implementation does not re-use any gdbserver code, sidestepping the complexities of POSIX. There exist two run scripts illustrating the new component. The os/run/monitor.run script exercises memory inspection via the 'm' command by letting a test program monitor itself. The os/run/monitor_gdb.run script allows for the interactive use of GDB to interact with monitored components. Issue #4917
118 lines
2.6 KiB
C++
118 lines
2.6 KiB
C++
/*
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* \brief GDB packet parser
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* \author Norman Feske
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* \date 2023-05-11
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*/
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/*
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* Copyright (C) 2023 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _MONITOR__GDB_PACKET_H_
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#define _MONITOR__GDB_PACKET_H_
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#include <util/string.h>
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namespace Genode { template <size_t> struct Gdb_packet; }
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template <Genode::size_t MAX_SIZE>
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struct Genode::Gdb_packet
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{
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enum class State {
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IDLE, INCOMPLETE,
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EXPECT_CHECKSUM1, EXPECT_CHECKSUM2,
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COMPLETE, CORRUPT
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};
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State state { State::IDLE };
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unsigned cursor = 0;
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struct Checksum
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{
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uint8_t accumulated;
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uint8_t expected;
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bool matches() const { return (accumulated == expected); }
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};
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Checksum checksum { };
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char buf[MAX_SIZE] { };
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void reset()
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{
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state = State::IDLE;
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cursor = 0;
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checksum = { };
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}
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enum class Append_result { OK, COMPLETE, OVERFLOW, CORRUPT };
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Append_result append(char const c)
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{
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if (cursor >= sizeof(buf))
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return Append_result::OVERFLOW;
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auto interpret = [&]
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{
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auto is_hex_digit = [] (char c) { return is_digit(c, true); };
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auto hex_digit = [] (char c) { return digit (c, true); };
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if (state == State::EXPECT_CHECKSUM1 || state == State::EXPECT_CHECKSUM2)
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if (!is_hex_digit(c))
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return State::CORRUPT;
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switch (state) {
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case State::IDLE:
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return (c == '$') ? State::INCOMPLETE
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: State::IDLE;
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case State::INCOMPLETE:
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return (c == '#') ? State::EXPECT_CHECKSUM1
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: State::INCOMPLETE;
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case State::EXPECT_CHECKSUM1:
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checksum.expected = uint8_t(hex_digit(c) << 4u);
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return State::EXPECT_CHECKSUM2;
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case State::EXPECT_CHECKSUM2:
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checksum.expected |= uint8_t(hex_digit(c));
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return checksum.matches() ? State::COMPLETE
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: State::CORRUPT;
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case State::COMPLETE:
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case State::CORRUPT:
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break; /* expect call of 'reset' */
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};
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return state;
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};
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State const orig_state = state;
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state = interpret();
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/* capture only the command payload between '$' and '#' */
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if ((orig_state == State::INCOMPLETE) && (state == State::INCOMPLETE)) {
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buf[cursor++] = c;
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checksum.accumulated = uint8_t(checksum.accumulated + c);
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}
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return (state == State::COMPLETE) ? Append_result::COMPLETE :
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(state == State::CORRUPT) ? Append_result::CORRUPT :
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Append_result::OK;
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}
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bool complete() const { return state == State::COMPLETE; }
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void with_command(auto const &fn) const
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{
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if (complete())
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fn(Const_byte_range_ptr { buf, cursor });
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}
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};
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#endif /* _MONITOR__GDB_PACKET_H_ */
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