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/*
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* gdb server stub
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h" |
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#include "qemu-common.h" |
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#ifdef CONFIG_USER_ONLY
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#include <stdlib.h> |
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#include <stdio.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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|
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#include "qemu.h" |
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#else
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#include "monitor/monitor.h" |
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#include "sysemu/char.h" |
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#include "sysemu/sysemu.h" |
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#include "exec/gdbstub.h" |
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#endif
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|
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#define MAX_PACKET_LENGTH 4096 |
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#include "cpu.h" |
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#include "qemu/sockets.h" |
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#include "sysemu/kvm.h" |
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|
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static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr, |
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uint8_t *buf, int len, bool is_write) |
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{ |
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CPUClass *cc = CPU_GET_CLASS(cpu); |
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if (cc->memory_rw_debug) {
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return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
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} |
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return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
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} |
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enum {
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GDB_SIGNAL_0 = 0,
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GDB_SIGNAL_INT = 2,
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GDB_SIGNAL_QUIT = 3,
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GDB_SIGNAL_TRAP = 5,
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GDB_SIGNAL_ABRT = 6,
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GDB_SIGNAL_ALRM = 14,
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GDB_SIGNAL_IO = 23,
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GDB_SIGNAL_XCPU = 24,
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GDB_SIGNAL_UNKNOWN = 143
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}; |
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#ifdef CONFIG_USER_ONLY
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/* Map target signal numbers to GDB protocol signal numbers and vice
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* versa. For user emulation's currently supported systems, we can
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* assume most signals are defined.
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*/
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static int gdb_signal_table[] = { |
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0,
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TARGET_SIGHUP, |
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TARGET_SIGINT, |
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TARGET_SIGQUIT, |
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TARGET_SIGILL, |
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TARGET_SIGTRAP, |
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TARGET_SIGABRT, |
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-1, /* SIGEMT */ |
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TARGET_SIGFPE, |
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TARGET_SIGKILL, |
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TARGET_SIGBUS, |
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TARGET_SIGSEGV, |
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TARGET_SIGSYS, |
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TARGET_SIGPIPE, |
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TARGET_SIGALRM, |
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TARGET_SIGTERM, |
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TARGET_SIGURG, |
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TARGET_SIGSTOP, |
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TARGET_SIGTSTP, |
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TARGET_SIGCONT, |
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TARGET_SIGCHLD, |
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TARGET_SIGTTIN, |
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TARGET_SIGTTOU, |
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TARGET_SIGIO, |
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TARGET_SIGXCPU, |
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TARGET_SIGXFSZ, |
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TARGET_SIGVTALRM, |
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TARGET_SIGPROF, |
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TARGET_SIGWINCH, |
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-1, /* SIGLOST */ |
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TARGET_SIGUSR1, |
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TARGET_SIGUSR2, |
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#ifdef TARGET_SIGPWR
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TARGET_SIGPWR, |
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#else
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-1,
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#endif
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-1, /* SIGPOLL */ |
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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#ifdef __SIGRTMIN
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__SIGRTMIN + 1,
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__SIGRTMIN + 2,
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__SIGRTMIN + 3,
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__SIGRTMIN + 4,
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__SIGRTMIN + 5,
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__SIGRTMIN + 6,
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__SIGRTMIN + 7,
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__SIGRTMIN + 8,
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__SIGRTMIN + 9,
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__SIGRTMIN + 10,
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__SIGRTMIN + 11,
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__SIGRTMIN + 12,
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__SIGRTMIN + 13,
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__SIGRTMIN + 14,
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__SIGRTMIN + 15,
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__SIGRTMIN + 16,
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__SIGRTMIN + 17,
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__SIGRTMIN + 18,
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__SIGRTMIN + 19,
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__SIGRTMIN + 20,
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__SIGRTMIN + 21,
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__SIGRTMIN + 22,
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__SIGRTMIN + 23,
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__SIGRTMIN + 24,
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__SIGRTMIN + 25,
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__SIGRTMIN + 26,
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__SIGRTMIN + 27,
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__SIGRTMIN + 28,
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__SIGRTMIN + 29,
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__SIGRTMIN + 30,
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__SIGRTMIN + 31,
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-1, /* SIGCANCEL */ |
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__SIGRTMIN, |
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__SIGRTMIN + 32,
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__SIGRTMIN + 33,
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__SIGRTMIN + 34,
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__SIGRTMIN + 35,
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__SIGRTMIN + 36,
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__SIGRTMIN + 37,
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__SIGRTMIN + 38,
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__SIGRTMIN + 39,
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__SIGRTMIN + 40,
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__SIGRTMIN + 41,
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__SIGRTMIN + 42,
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__SIGRTMIN + 43,
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__SIGRTMIN + 44,
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__SIGRTMIN + 45,
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__SIGRTMIN + 46,
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__SIGRTMIN + 47,
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__SIGRTMIN + 48,
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__SIGRTMIN + 49,
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__SIGRTMIN + 50,
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__SIGRTMIN + 51,
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__SIGRTMIN + 52,
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__SIGRTMIN + 53,
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__SIGRTMIN + 54,
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__SIGRTMIN + 55,
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__SIGRTMIN + 56,
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__SIGRTMIN + 57,
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__SIGRTMIN + 58,
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__SIGRTMIN + 59,
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__SIGRTMIN + 60,
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__SIGRTMIN + 61,
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__SIGRTMIN + 62,
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__SIGRTMIN + 63,
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__SIGRTMIN + 64,
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__SIGRTMIN + 65,
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__SIGRTMIN + 66,
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__SIGRTMIN + 67,
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__SIGRTMIN + 68,
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__SIGRTMIN + 69,
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__SIGRTMIN + 70,
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__SIGRTMIN + 71,
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__SIGRTMIN + 72,
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__SIGRTMIN + 73,
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__SIGRTMIN + 74,
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__SIGRTMIN + 75,
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__SIGRTMIN + 76,
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__SIGRTMIN + 77,
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__SIGRTMIN + 78,
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__SIGRTMIN + 79,
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__SIGRTMIN + 80,
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__SIGRTMIN + 81,
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__SIGRTMIN + 82,
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__SIGRTMIN + 83,
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__SIGRTMIN + 84,
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__SIGRTMIN + 85,
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__SIGRTMIN + 86,
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__SIGRTMIN + 87,
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__SIGRTMIN + 88,
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__SIGRTMIN + 89,
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__SIGRTMIN + 90,
|
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__SIGRTMIN + 91,
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__SIGRTMIN + 92,
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__SIGRTMIN + 93,
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__SIGRTMIN + 94,
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__SIGRTMIN + 95,
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-1, /* SIGINFO */ |
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-1, /* UNKNOWN */ |
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-1, /* DEFAULT */ |
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-1,
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-1,
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-1,
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-1,
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-1,
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-1
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#endif
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}; |
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#else
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/* In system mode we only need SIGINT and SIGTRAP; other signals
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are not yet supported. */
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enum {
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TARGET_SIGINT = 2,
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TARGET_SIGTRAP = 5
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}; |
241 |
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static int gdb_signal_table[] = { |
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-1,
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-1,
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TARGET_SIGINT, |
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-1,
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-1,
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TARGET_SIGTRAP |
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}; |
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#endif
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#ifdef CONFIG_USER_ONLY
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static int target_signal_to_gdb (int sig) |
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{ |
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int i;
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for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++) |
257 |
if (gdb_signal_table[i] == sig)
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return i;
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return GDB_SIGNAL_UNKNOWN;
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} |
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#endif
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|
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static int gdb_signal_to_target (int sig) |
264 |
{ |
265 |
if (sig < ARRAY_SIZE (gdb_signal_table))
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return gdb_signal_table[sig];
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else
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return -1; |
269 |
} |
270 |
|
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//#define DEBUG_GDB
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|
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typedef struct GDBRegisterState { |
274 |
int base_reg;
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int num_regs;
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gdb_reg_cb get_reg; |
277 |
gdb_reg_cb set_reg; |
278 |
const char *xml; |
279 |
struct GDBRegisterState *next;
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} GDBRegisterState; |
281 |
|
282 |
enum RSState {
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RS_INACTIVE, |
284 |
RS_IDLE, |
285 |
RS_GETLINE, |
286 |
RS_CHKSUM1, |
287 |
RS_CHKSUM2, |
288 |
}; |
289 |
typedef struct GDBState { |
290 |
CPUState *c_cpu; /* current CPU for step/continue ops */
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CPUState *g_cpu; /* current CPU for other ops */
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CPUState *query_cpu; /* for q{f|s}ThreadInfo */
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enum RSState state; /* parsing state */ |
294 |
char line_buf[MAX_PACKET_LENGTH];
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int line_buf_index;
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int line_csum;
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uint8_t last_packet[MAX_PACKET_LENGTH + 4];
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int last_packet_len;
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299 |
int signal;
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300 |
#ifdef CONFIG_USER_ONLY
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int fd;
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int running_state;
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#else
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304 |
CharDriverState *chr; |
305 |
CharDriverState *mon_chr; |
306 |
#endif
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307 |
char syscall_buf[256]; |
308 |
gdb_syscall_complete_cb current_syscall_cb; |
309 |
} GDBState; |
310 |
|
311 |
/* By default use no IRQs and no timers while single stepping so as to
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312 |
* make single stepping like an ICE HW step.
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313 |
*/
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static int sstep_flags = SSTEP_ENABLE|SSTEP_NOIRQ|SSTEP_NOTIMER; |
315 |
|
316 |
static GDBState *gdbserver_state;
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317 |
|
318 |
bool gdb_has_xml;
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319 |
|
320 |
#ifdef CONFIG_USER_ONLY
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321 |
/* XXX: This is not thread safe. Do we care? */
|
322 |
static int gdbserver_fd = -1; |
323 |
|
324 |
static int get_char(GDBState *s) |
325 |
{ |
326 |
uint8_t ch; |
327 |
int ret;
|
328 |
|
329 |
for(;;) {
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330 |
ret = qemu_recv(s->fd, &ch, 1, 0); |
331 |
if (ret < 0) { |
332 |
if (errno == ECONNRESET)
|
333 |
s->fd = -1;
|
334 |
if (errno != EINTR && errno != EAGAIN)
|
335 |
return -1; |
336 |
} else if (ret == 0) { |
337 |
close(s->fd); |
338 |
s->fd = -1;
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339 |
return -1; |
340 |
} else {
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341 |
break;
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342 |
} |
343 |
} |
344 |
return ch;
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345 |
} |
346 |
#endif
|
347 |
|
348 |
static enum { |
349 |
GDB_SYS_UNKNOWN, |
350 |
GDB_SYS_ENABLED, |
351 |
GDB_SYS_DISABLED, |
352 |
} gdb_syscall_mode; |
353 |
|
354 |
/* If gdb is connected when the first semihosting syscall occurs then use
|
355 |
remote gdb syscalls. Otherwise use native file IO. */
|
356 |
int use_gdb_syscalls(void) |
357 |
{ |
358 |
if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
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359 |
gdb_syscall_mode = (gdbserver_state ? GDB_SYS_ENABLED |
360 |
: GDB_SYS_DISABLED); |
361 |
} |
362 |
return gdb_syscall_mode == GDB_SYS_ENABLED;
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363 |
} |
364 |
|
365 |
/* Resume execution. */
|
366 |
static inline void gdb_continue(GDBState *s) |
367 |
{ |
368 |
#ifdef CONFIG_USER_ONLY
|
369 |
s->running_state = 1;
|
370 |
#else
|
371 |
if (!runstate_needs_reset()) {
|
372 |
vm_start(); |
373 |
} |
374 |
#endif
|
375 |
} |
376 |
|
377 |
static void put_buffer(GDBState *s, const uint8_t *buf, int len) |
378 |
{ |
379 |
#ifdef CONFIG_USER_ONLY
|
380 |
int ret;
|
381 |
|
382 |
while (len > 0) { |
383 |
ret = send(s->fd, buf, len, 0);
|
384 |
if (ret < 0) { |
385 |
if (errno != EINTR && errno != EAGAIN)
|
386 |
return;
|
387 |
} else {
|
388 |
buf += ret; |
389 |
len -= ret; |
390 |
} |
391 |
} |
392 |
#else
|
393 |
qemu_chr_fe_write(s->chr, buf, len); |
394 |
#endif
|
395 |
} |
396 |
|
397 |
static inline int fromhex(int v) |
398 |
{ |
399 |
if (v >= '0' && v <= '9') |
400 |
return v - '0'; |
401 |
else if (v >= 'A' && v <= 'F') |
402 |
return v - 'A' + 10; |
403 |
else if (v >= 'a' && v <= 'f') |
404 |
return v - 'a' + 10; |
405 |
else
|
406 |
return 0; |
407 |
} |
408 |
|
409 |
static inline int tohex(int v) |
410 |
{ |
411 |
if (v < 10) |
412 |
return v + '0'; |
413 |
else
|
414 |
return v - 10 + 'a'; |
415 |
} |
416 |
|
417 |
static void memtohex(char *buf, const uint8_t *mem, int len) |
418 |
{ |
419 |
int i, c;
|
420 |
char *q;
|
421 |
q = buf; |
422 |
for(i = 0; i < len; i++) { |
423 |
c = mem[i]; |
424 |
*q++ = tohex(c >> 4);
|
425 |
*q++ = tohex(c & 0xf);
|
426 |
} |
427 |
*q = '\0';
|
428 |
} |
429 |
|
430 |
static void hextomem(uint8_t *mem, const char *buf, int len) |
431 |
{ |
432 |
int i;
|
433 |
|
434 |
for(i = 0; i < len; i++) { |
435 |
mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); |
436 |
buf += 2;
|
437 |
} |
438 |
} |
439 |
|
440 |
/* return -1 if error, 0 if OK */
|
441 |
static int put_packet_binary(GDBState *s, const char *buf, int len) |
442 |
{ |
443 |
int csum, i;
|
444 |
uint8_t *p; |
445 |
|
446 |
for(;;) {
|
447 |
p = s->last_packet; |
448 |
*(p++) = '$';
|
449 |
memcpy(p, buf, len); |
450 |
p += len; |
451 |
csum = 0;
|
452 |
for(i = 0; i < len; i++) { |
453 |
csum += buf[i]; |
454 |
} |
455 |
*(p++) = '#';
|
456 |
*(p++) = tohex((csum >> 4) & 0xf); |
457 |
*(p++) = tohex((csum) & 0xf);
|
458 |
|
459 |
s->last_packet_len = p - s->last_packet; |
460 |
put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); |
461 |
|
462 |
#ifdef CONFIG_USER_ONLY
|
463 |
i = get_char(s); |
464 |
if (i < 0) |
465 |
return -1; |
466 |
if (i == '+') |
467 |
break;
|
468 |
#else
|
469 |
break;
|
470 |
#endif
|
471 |
} |
472 |
return 0; |
473 |
} |
474 |
|
475 |
/* return -1 if error, 0 if OK */
|
476 |
static int put_packet(GDBState *s, const char *buf) |
477 |
{ |
478 |
#ifdef DEBUG_GDB
|
479 |
printf("reply='%s'\n", buf);
|
480 |
#endif
|
481 |
|
482 |
return put_packet_binary(s, buf, strlen(buf));
|
483 |
} |
484 |
|
485 |
/* Encode data using the encoding for 'x' packets. */
|
486 |
static int memtox(char *buf, const char *mem, int len) |
487 |
{ |
488 |
char *p = buf;
|
489 |
char c;
|
490 |
|
491 |
while (len--) {
|
492 |
c = *(mem++); |
493 |
switch (c) {
|
494 |
case '#': case '$': case '*': case '}': |
495 |
*(p++) = '}';
|
496 |
*(p++) = c ^ 0x20;
|
497 |
break;
|
498 |
default:
|
499 |
*(p++) = c; |
500 |
break;
|
501 |
} |
502 |
} |
503 |
return p - buf;
|
504 |
} |
505 |
|
506 |
static const char *get_feature_xml(const char *p, const char **newp, |
507 |
CPUClass *cc) |
508 |
{ |
509 |
size_t len; |
510 |
int i;
|
511 |
const char *name; |
512 |
static char target_xml[1024]; |
513 |
|
514 |
len = 0;
|
515 |
while (p[len] && p[len] != ':') |
516 |
len++; |
517 |
*newp = p + len; |
518 |
|
519 |
name = NULL;
|
520 |
if (strncmp(p, "target.xml", len) == 0) { |
521 |
/* Generate the XML description for this CPU. */
|
522 |
if (!target_xml[0]) { |
523 |
GDBRegisterState *r; |
524 |
CPUState *cpu = first_cpu; |
525 |
|
526 |
snprintf(target_xml, sizeof(target_xml),
|
527 |
"<?xml version=\"1.0\"?>"
|
528 |
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
|
529 |
"<target>"
|
530 |
"<xi:include href=\"%s\"/>",
|
531 |
cc->gdb_core_xml_file); |
532 |
|
533 |
for (r = cpu->gdb_regs; r; r = r->next) {
|
534 |
pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\""); |
535 |
pstrcat(target_xml, sizeof(target_xml), r->xml);
|
536 |
pstrcat(target_xml, sizeof(target_xml), "\"/>"); |
537 |
} |
538 |
pstrcat(target_xml, sizeof(target_xml), "</target>"); |
539 |
} |
540 |
return target_xml;
|
541 |
} |
542 |
for (i = 0; ; i++) { |
543 |
name = xml_builtin[i][0];
|
544 |
if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len)) |
545 |
break;
|
546 |
} |
547 |
return name ? xml_builtin[i][1] : NULL; |
548 |
} |
549 |
|
550 |
static int gdb_read_register(CPUState *cpu, uint8_t *mem_buf, int reg) |
551 |
{ |
552 |
CPUClass *cc = CPU_GET_CLASS(cpu); |
553 |
CPUArchState *env = cpu->env_ptr; |
554 |
GDBRegisterState *r; |
555 |
|
556 |
if (reg < cc->gdb_num_core_regs) {
|
557 |
return cc->gdb_read_register(cpu, mem_buf, reg);
|
558 |
} |
559 |
|
560 |
for (r = cpu->gdb_regs; r; r = r->next) {
|
561 |
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
|
562 |
return r->get_reg(env, mem_buf, reg - r->base_reg);
|
563 |
} |
564 |
} |
565 |
return 0; |
566 |
} |
567 |
|
568 |
static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) |
569 |
{ |
570 |
CPUClass *cc = CPU_GET_CLASS(cpu); |
571 |
CPUArchState *env = cpu->env_ptr; |
572 |
GDBRegisterState *r; |
573 |
|
574 |
if (reg < cc->gdb_num_core_regs) {
|
575 |
return cc->gdb_write_register(cpu, mem_buf, reg);
|
576 |
} |
577 |
|
578 |
for (r = cpu->gdb_regs; r; r = r->next) {
|
579 |
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
|
580 |
return r->set_reg(env, mem_buf, reg - r->base_reg);
|
581 |
} |
582 |
} |
583 |
return 0; |
584 |
} |
585 |
|
586 |
/* Register a supplemental set of CPU registers. If g_pos is nonzero it
|
587 |
specifies the first register number and these registers are included in
|
588 |
a standard "g" packet. Direction is relative to gdb, i.e. get_reg is
|
589 |
gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
|
590 |
*/
|
591 |
|
592 |
void gdb_register_coprocessor(CPUState *cpu,
|
593 |
gdb_reg_cb get_reg, gdb_reg_cb set_reg, |
594 |
int num_regs, const char *xml, int g_pos) |
595 |
{ |
596 |
GDBRegisterState *s; |
597 |
GDBRegisterState **p; |
598 |
|
599 |
p = &cpu->gdb_regs; |
600 |
while (*p) {
|
601 |
/* Check for duplicates. */
|
602 |
if (strcmp((*p)->xml, xml) == 0) |
603 |
return;
|
604 |
p = &(*p)->next; |
605 |
} |
606 |
|
607 |
s = g_new0(GDBRegisterState, 1);
|
608 |
s->base_reg = cpu->gdb_num_regs; |
609 |
s->num_regs = num_regs; |
610 |
s->get_reg = get_reg; |
611 |
s->set_reg = set_reg; |
612 |
s->xml = xml; |
613 |
|
614 |
/* Add to end of list. */
|
615 |
cpu->gdb_num_regs += num_regs; |
616 |
*p = s; |
617 |
if (g_pos) {
|
618 |
if (g_pos != s->base_reg) {
|
619 |
fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n"
|
620 |
"Expected %d got %d\n", xml, g_pos, s->base_reg);
|
621 |
} else {
|
622 |
cpu->gdb_num_g_regs = cpu->gdb_num_regs; |
623 |
} |
624 |
} |
625 |
} |
626 |
|
627 |
#ifndef CONFIG_USER_ONLY
|
628 |
static const int xlat_gdb_type[] = { |
629 |
[GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE, |
630 |
[GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ, |
631 |
[GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS, |
632 |
}; |
633 |
#endif
|
634 |
|
635 |
static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type) |
636 |
{ |
637 |
CPUState *cpu; |
638 |
CPUArchState *env; |
639 |
int err = 0; |
640 |
|
641 |
if (kvm_enabled()) {
|
642 |
return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type);
|
643 |
} |
644 |
|
645 |
switch (type) {
|
646 |
case GDB_BREAKPOINT_SW:
|
647 |
case GDB_BREAKPOINT_HW:
|
648 |
CPU_FOREACH(cpu) { |
649 |
env = cpu->env_ptr; |
650 |
err = cpu_breakpoint_insert(env, addr, BP_GDB, NULL);
|
651 |
if (err)
|
652 |
break;
|
653 |
} |
654 |
return err;
|
655 |
#ifndef CONFIG_USER_ONLY
|
656 |
case GDB_WATCHPOINT_WRITE:
|
657 |
case GDB_WATCHPOINT_READ:
|
658 |
case GDB_WATCHPOINT_ACCESS:
|
659 |
CPU_FOREACH(cpu) { |
660 |
env = cpu->env_ptr; |
661 |
err = cpu_watchpoint_insert(env, addr, len, xlat_gdb_type[type], |
662 |
NULL);
|
663 |
if (err)
|
664 |
break;
|
665 |
} |
666 |
return err;
|
667 |
#endif
|
668 |
default:
|
669 |
return -ENOSYS;
|
670 |
} |
671 |
} |
672 |
|
673 |
static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type) |
674 |
{ |
675 |
CPUState *cpu; |
676 |
CPUArchState *env; |
677 |
int err = 0; |
678 |
|
679 |
if (kvm_enabled()) {
|
680 |
return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type);
|
681 |
} |
682 |
|
683 |
switch (type) {
|
684 |
case GDB_BREAKPOINT_SW:
|
685 |
case GDB_BREAKPOINT_HW:
|
686 |
CPU_FOREACH(cpu) { |
687 |
env = cpu->env_ptr; |
688 |
err = cpu_breakpoint_remove(env, addr, BP_GDB); |
689 |
if (err)
|
690 |
break;
|
691 |
} |
692 |
return err;
|
693 |
#ifndef CONFIG_USER_ONLY
|
694 |
case GDB_WATCHPOINT_WRITE:
|
695 |
case GDB_WATCHPOINT_READ:
|
696 |
case GDB_WATCHPOINT_ACCESS:
|
697 |
CPU_FOREACH(cpu) { |
698 |
env = cpu->env_ptr; |
699 |
err = cpu_watchpoint_remove(env, addr, len, xlat_gdb_type[type]); |
700 |
if (err)
|
701 |
break;
|
702 |
} |
703 |
return err;
|
704 |
#endif
|
705 |
default:
|
706 |
return -ENOSYS;
|
707 |
} |
708 |
} |
709 |
|
710 |
static void gdb_breakpoint_remove_all(void) |
711 |
{ |
712 |
CPUState *cpu; |
713 |
CPUArchState *env; |
714 |
|
715 |
if (kvm_enabled()) {
|
716 |
kvm_remove_all_breakpoints(gdbserver_state->c_cpu); |
717 |
return;
|
718 |
} |
719 |
|
720 |
CPU_FOREACH(cpu) { |
721 |
env = cpu->env_ptr; |
722 |
cpu_breakpoint_remove_all(env, BP_GDB); |
723 |
#ifndef CONFIG_USER_ONLY
|
724 |
cpu_watchpoint_remove_all(env, BP_GDB); |
725 |
#endif
|
726 |
} |
727 |
} |
728 |
|
729 |
static void gdb_set_cpu_pc(GDBState *s, target_ulong pc) |
730 |
{ |
731 |
CPUState *cpu = s->c_cpu; |
732 |
CPUClass *cc = CPU_GET_CLASS(cpu); |
733 |
|
734 |
cpu_synchronize_state(cpu); |
735 |
if (cc->set_pc) {
|
736 |
cc->set_pc(cpu, pc); |
737 |
} |
738 |
} |
739 |
|
740 |
static CPUState *find_cpu(uint32_t thread_id)
|
741 |
{ |
742 |
CPUState *cpu; |
743 |
|
744 |
CPU_FOREACH(cpu) { |
745 |
if (cpu_index(cpu) == thread_id) {
|
746 |
return cpu;
|
747 |
} |
748 |
} |
749 |
|
750 |
return NULL; |
751 |
} |
752 |
|
753 |
static int gdb_handle_packet(GDBState *s, const char *line_buf) |
754 |
{ |
755 |
CPUState *cpu; |
756 |
CPUClass *cc; |
757 |
const char *p; |
758 |
uint32_t thread; |
759 |
int ch, reg_size, type, res;
|
760 |
char buf[MAX_PACKET_LENGTH];
|
761 |
uint8_t mem_buf[MAX_PACKET_LENGTH]; |
762 |
uint8_t *registers; |
763 |
target_ulong addr, len; |
764 |
|
765 |
#ifdef DEBUG_GDB
|
766 |
printf("command='%s'\n", line_buf);
|
767 |
#endif
|
768 |
p = line_buf; |
769 |
ch = *p++; |
770 |
switch(ch) {
|
771 |
case '?': |
772 |
/* TODO: Make this return the correct value for user-mode. */
|
773 |
snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP, |
774 |
cpu_index(s->c_cpu)); |
775 |
put_packet(s, buf); |
776 |
/* Remove all the breakpoints when this query is issued,
|
777 |
* because gdb is doing and initial connect and the state
|
778 |
* should be cleaned up.
|
779 |
*/
|
780 |
gdb_breakpoint_remove_all(); |
781 |
break;
|
782 |
case 'c': |
783 |
if (*p != '\0') { |
784 |
addr = strtoull(p, (char **)&p, 16); |
785 |
gdb_set_cpu_pc(s, addr); |
786 |
} |
787 |
s->signal = 0;
|
788 |
gdb_continue(s); |
789 |
return RS_IDLE;
|
790 |
case 'C': |
791 |
s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16)); |
792 |
if (s->signal == -1) |
793 |
s->signal = 0;
|
794 |
gdb_continue(s); |
795 |
return RS_IDLE;
|
796 |
case 'v': |
797 |
if (strncmp(p, "Cont", 4) == 0) { |
798 |
int res_signal, res_thread;
|
799 |
|
800 |
p += 4;
|
801 |
if (*p == '?') { |
802 |
put_packet(s, "vCont;c;C;s;S");
|
803 |
break;
|
804 |
} |
805 |
res = 0;
|
806 |
res_signal = 0;
|
807 |
res_thread = 0;
|
808 |
while (*p) {
|
809 |
int action, signal;
|
810 |
|
811 |
if (*p++ != ';') { |
812 |
res = 0;
|
813 |
break;
|
814 |
} |
815 |
action = *p++; |
816 |
signal = 0;
|
817 |
if (action == 'C' || action == 'S') { |
818 |
signal = strtoul(p, (char **)&p, 16); |
819 |
} else if (action != 'c' && action != 's') { |
820 |
res = 0;
|
821 |
break;
|
822 |
} |
823 |
thread = 0;
|
824 |
if (*p == ':') { |
825 |
thread = strtoull(p+1, (char **)&p, 16); |
826 |
} |
827 |
action = tolower(action); |
828 |
if (res == 0 || (res == 'c' && action == 's')) { |
829 |
res = action; |
830 |
res_signal = signal; |
831 |
res_thread = thread; |
832 |
} |
833 |
} |
834 |
if (res) {
|
835 |
if (res_thread != -1 && res_thread != 0) { |
836 |
cpu = find_cpu(res_thread); |
837 |
if (cpu == NULL) { |
838 |
put_packet(s, "E22");
|
839 |
break;
|
840 |
} |
841 |
s->c_cpu = cpu; |
842 |
} |
843 |
if (res == 's') { |
844 |
cpu_single_step(s->c_cpu, sstep_flags); |
845 |
} |
846 |
s->signal = res_signal; |
847 |
gdb_continue(s); |
848 |
return RS_IDLE;
|
849 |
} |
850 |
break;
|
851 |
} else {
|
852 |
goto unknown_command;
|
853 |
} |
854 |
case 'k': |
855 |
#ifdef CONFIG_USER_ONLY
|
856 |
/* Kill the target */
|
857 |
fprintf(stderr, "\nQEMU: Terminated via GDBstub\n");
|
858 |
exit(0);
|
859 |
#endif
|
860 |
case 'D': |
861 |
/* Detach packet */
|
862 |
gdb_breakpoint_remove_all(); |
863 |
gdb_syscall_mode = GDB_SYS_DISABLED; |
864 |
gdb_continue(s); |
865 |
put_packet(s, "OK");
|
866 |
break;
|
867 |
case 's': |
868 |
if (*p != '\0') { |
869 |
addr = strtoull(p, (char **)&p, 16); |
870 |
gdb_set_cpu_pc(s, addr); |
871 |
} |
872 |
cpu_single_step(s->c_cpu, sstep_flags); |
873 |
gdb_continue(s); |
874 |
return RS_IDLE;
|
875 |
case 'F': |
876 |
{ |
877 |
target_ulong ret; |
878 |
target_ulong err; |
879 |
|
880 |
ret = strtoull(p, (char **)&p, 16); |
881 |
if (*p == ',') { |
882 |
p++; |
883 |
err = strtoull(p, (char **)&p, 16); |
884 |
} else {
|
885 |
err = 0;
|
886 |
} |
887 |
if (*p == ',') |
888 |
p++; |
889 |
type = *p; |
890 |
if (s->current_syscall_cb) {
|
891 |
s->current_syscall_cb(s->c_cpu, ret, err); |
892 |
s->current_syscall_cb = NULL;
|
893 |
} |
894 |
if (type == 'C') { |
895 |
put_packet(s, "T02");
|
896 |
} else {
|
897 |
gdb_continue(s); |
898 |
} |
899 |
} |
900 |
break;
|
901 |
case 'g': |
902 |
cpu_synchronize_state(s->g_cpu); |
903 |
len = 0;
|
904 |
for (addr = 0; addr < s->g_cpu->gdb_num_g_regs; addr++) { |
905 |
reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr); |
906 |
len += reg_size; |
907 |
} |
908 |
memtohex(buf, mem_buf, len); |
909 |
put_packet(s, buf); |
910 |
break;
|
911 |
case 'G': |
912 |
cpu_synchronize_state(s->g_cpu); |
913 |
registers = mem_buf; |
914 |
len = strlen(p) / 2;
|
915 |
hextomem((uint8_t *)registers, p, len); |
916 |
for (addr = 0; addr < s->g_cpu->gdb_num_g_regs && len > 0; addr++) { |
917 |
reg_size = gdb_write_register(s->g_cpu, registers, addr); |
918 |
len -= reg_size; |
919 |
registers += reg_size; |
920 |
} |
921 |
put_packet(s, "OK");
|
922 |
break;
|
923 |
case 'm': |
924 |
addr = strtoull(p, (char **)&p, 16); |
925 |
if (*p == ',') |
926 |
p++; |
927 |
len = strtoull(p, NULL, 16); |
928 |
if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, false) != 0) { |
929 |
put_packet (s, "E14");
|
930 |
} else {
|
931 |
memtohex(buf, mem_buf, len); |
932 |
put_packet(s, buf); |
933 |
} |
934 |
break;
|
935 |
case 'M': |
936 |
addr = strtoull(p, (char **)&p, 16); |
937 |
if (*p == ',') |
938 |
p++; |
939 |
len = strtoull(p, (char **)&p, 16); |
940 |
if (*p == ':') |
941 |
p++; |
942 |
hextomem(mem_buf, p, len); |
943 |
if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len,
|
944 |
true) != 0) { |
945 |
put_packet(s, "E14");
|
946 |
} else {
|
947 |
put_packet(s, "OK");
|
948 |
} |
949 |
break;
|
950 |
case 'p': |
951 |
/* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable.
|
952 |
This works, but can be very slow. Anything new enough to
|
953 |
understand XML also knows how to use this properly. */
|
954 |
if (!gdb_has_xml)
|
955 |
goto unknown_command;
|
956 |
addr = strtoull(p, (char **)&p, 16); |
957 |
reg_size = gdb_read_register(s->g_cpu, mem_buf, addr); |
958 |
if (reg_size) {
|
959 |
memtohex(buf, mem_buf, reg_size); |
960 |
put_packet(s, buf); |
961 |
} else {
|
962 |
put_packet(s, "E14");
|
963 |
} |
964 |
break;
|
965 |
case 'P': |
966 |
if (!gdb_has_xml)
|
967 |
goto unknown_command;
|
968 |
addr = strtoull(p, (char **)&p, 16); |
969 |
if (*p == '=') |
970 |
p++; |
971 |
reg_size = strlen(p) / 2;
|
972 |
hextomem(mem_buf, p, reg_size); |
973 |
gdb_write_register(s->g_cpu, mem_buf, addr); |
974 |
put_packet(s, "OK");
|
975 |
break;
|
976 |
case 'Z': |
977 |
case 'z': |
978 |
type = strtoul(p, (char **)&p, 16); |
979 |
if (*p == ',') |
980 |
p++; |
981 |
addr = strtoull(p, (char **)&p, 16); |
982 |
if (*p == ',') |
983 |
p++; |
984 |
len = strtoull(p, (char **)&p, 16); |
985 |
if (ch == 'Z') |
986 |
res = gdb_breakpoint_insert(addr, len, type); |
987 |
else
|
988 |
res = gdb_breakpoint_remove(addr, len, type); |
989 |
if (res >= 0) |
990 |
put_packet(s, "OK");
|
991 |
else if (res == -ENOSYS) |
992 |
put_packet(s, "");
|
993 |
else
|
994 |
put_packet(s, "E22");
|
995 |
break;
|
996 |
case 'H': |
997 |
type = *p++; |
998 |
thread = strtoull(p, (char **)&p, 16); |
999 |
if (thread == -1 || thread == 0) { |
1000 |
put_packet(s, "OK");
|
1001 |
break;
|
1002 |
} |
1003 |
cpu = find_cpu(thread); |
1004 |
if (cpu == NULL) { |
1005 |
put_packet(s, "E22");
|
1006 |
break;
|
1007 |
} |
1008 |
switch (type) {
|
1009 |
case 'c': |
1010 |
s->c_cpu = cpu; |
1011 |
put_packet(s, "OK");
|
1012 |
break;
|
1013 |
case 'g': |
1014 |
s->g_cpu = cpu; |
1015 |
put_packet(s, "OK");
|
1016 |
break;
|
1017 |
default:
|
1018 |
put_packet(s, "E22");
|
1019 |
break;
|
1020 |
} |
1021 |
break;
|
1022 |
case 'T': |
1023 |
thread = strtoull(p, (char **)&p, 16); |
1024 |
cpu = find_cpu(thread); |
1025 |
|
1026 |
if (cpu != NULL) { |
1027 |
put_packet(s, "OK");
|
1028 |
} else {
|
1029 |
put_packet(s, "E22");
|
1030 |
} |
1031 |
break;
|
1032 |
case 'q': |
1033 |
case 'Q': |
1034 |
/* parse any 'q' packets here */
|
1035 |
if (!strcmp(p,"qemu.sstepbits")) { |
1036 |
/* Query Breakpoint bit definitions */
|
1037 |
snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", |
1038 |
SSTEP_ENABLE, |
1039 |
SSTEP_NOIRQ, |
1040 |
SSTEP_NOTIMER); |
1041 |
put_packet(s, buf); |
1042 |
break;
|
1043 |
} else if (strncmp(p,"qemu.sstep",10) == 0) { |
1044 |
/* Display or change the sstep_flags */
|
1045 |
p += 10;
|
1046 |
if (*p != '=') { |
1047 |
/* Display current setting */
|
1048 |
snprintf(buf, sizeof(buf), "0x%x", sstep_flags); |
1049 |
put_packet(s, buf); |
1050 |
break;
|
1051 |
} |
1052 |
p++; |
1053 |
type = strtoul(p, (char **)&p, 16); |
1054 |
sstep_flags = type; |
1055 |
put_packet(s, "OK");
|
1056 |
break;
|
1057 |
} else if (strcmp(p,"C") == 0) { |
1058 |
/* "Current thread" remains vague in the spec, so always return
|
1059 |
* the first CPU (gdb returns the first thread). */
|
1060 |
put_packet(s, "QC1");
|
1061 |
break;
|
1062 |
} else if (strcmp(p,"fThreadInfo") == 0) { |
1063 |
s->query_cpu = first_cpu; |
1064 |
goto report_cpuinfo;
|
1065 |
} else if (strcmp(p,"sThreadInfo") == 0) { |
1066 |
report_cpuinfo:
|
1067 |
if (s->query_cpu) {
|
1068 |
snprintf(buf, sizeof(buf), "m%x", cpu_index(s->query_cpu)); |
1069 |
put_packet(s, buf); |
1070 |
s->query_cpu = CPU_NEXT(s->query_cpu); |
1071 |
} else
|
1072 |
put_packet(s, "l");
|
1073 |
break;
|
1074 |
} else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) { |
1075 |
thread = strtoull(p+16, (char **)&p, 16); |
1076 |
cpu = find_cpu(thread); |
1077 |
if (cpu != NULL) { |
1078 |
cpu_synchronize_state(cpu); |
1079 |
len = snprintf((char *)mem_buf, sizeof(mem_buf), |
1080 |
"CPU#%d [%s]", cpu->cpu_index,
|
1081 |
cpu->halted ? "halted " : "running"); |
1082 |
memtohex(buf, mem_buf, len); |
1083 |
put_packet(s, buf); |
1084 |
} |
1085 |
break;
|
1086 |
} |
1087 |
#ifdef CONFIG_USER_ONLY
|
1088 |
else if (strncmp(p, "Offsets", 7) == 0) { |
1089 |
CPUArchState *env = s->c_cpu->env_ptr; |
1090 |
TaskState *ts = env->opaque; |
1091 |
|
1092 |
snprintf(buf, sizeof(buf),
|
1093 |
"Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx |
1094 |
";Bss=" TARGET_ABI_FMT_lx,
|
1095 |
ts->info->code_offset, |
1096 |
ts->info->data_offset, |
1097 |
ts->info->data_offset); |
1098 |
put_packet(s, buf); |
1099 |
break;
|
1100 |
} |
1101 |
#else /* !CONFIG_USER_ONLY */ |
1102 |
else if (strncmp(p, "Rcmd,", 5) == 0) { |
1103 |
int len = strlen(p + 5); |
1104 |
|
1105 |
if ((len % 2) != 0) { |
1106 |
put_packet(s, "E01");
|
1107 |
break;
|
1108 |
} |
1109 |
hextomem(mem_buf, p + 5, len);
|
1110 |
len = len / 2;
|
1111 |
mem_buf[len++] = 0;
|
1112 |
qemu_chr_be_write(s->mon_chr, mem_buf, len); |
1113 |
put_packet(s, "OK");
|
1114 |
break;
|
1115 |
} |
1116 |
#endif /* !CONFIG_USER_ONLY */ |
1117 |
if (strncmp(p, "Supported", 9) == 0) { |
1118 |
snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH); |
1119 |
cc = CPU_GET_CLASS(first_cpu); |
1120 |
if (cc->gdb_core_xml_file != NULL) { |
1121 |
pstrcat(buf, sizeof(buf), ";qXfer:features:read+"); |
1122 |
} |
1123 |
put_packet(s, buf); |
1124 |
break;
|
1125 |
} |
1126 |
if (strncmp(p, "Xfer:features:read:", 19) == 0) { |
1127 |
const char *xml; |
1128 |
target_ulong total_len; |
1129 |
|
1130 |
cc = CPU_GET_CLASS(first_cpu); |
1131 |
if (cc->gdb_core_xml_file == NULL) { |
1132 |
goto unknown_command;
|
1133 |
} |
1134 |
|
1135 |
gdb_has_xml = true;
|
1136 |
p += 19;
|
1137 |
xml = get_feature_xml(p, &p, cc); |
1138 |
if (!xml) {
|
1139 |
snprintf(buf, sizeof(buf), "E00"); |
1140 |
put_packet(s, buf); |
1141 |
break;
|
1142 |
} |
1143 |
|
1144 |
if (*p == ':') |
1145 |
p++; |
1146 |
addr = strtoul(p, (char **)&p, 16); |
1147 |
if (*p == ',') |
1148 |
p++; |
1149 |
len = strtoul(p, (char **)&p, 16); |
1150 |
|
1151 |
total_len = strlen(xml); |
1152 |
if (addr > total_len) {
|
1153 |
snprintf(buf, sizeof(buf), "E00"); |
1154 |
put_packet(s, buf); |
1155 |
break;
|
1156 |
} |
1157 |
if (len > (MAX_PACKET_LENGTH - 5) / 2) |
1158 |
len = (MAX_PACKET_LENGTH - 5) / 2; |
1159 |
if (len < total_len - addr) {
|
1160 |
buf[0] = 'm'; |
1161 |
len = memtox(buf + 1, xml + addr, len);
|
1162 |
} else {
|
1163 |
buf[0] = 'l'; |
1164 |
len = memtox(buf + 1, xml + addr, total_len - addr);
|
1165 |
} |
1166 |
put_packet_binary(s, buf, len + 1);
|
1167 |
break;
|
1168 |
} |
1169 |
/* Unrecognised 'q' command. */
|
1170 |
goto unknown_command;
|
1171 |
|
1172 |
default:
|
1173 |
unknown_command:
|
1174 |
/* put empty packet */
|
1175 |
buf[0] = '\0'; |
1176 |
put_packet(s, buf); |
1177 |
break;
|
1178 |
} |
1179 |
return RS_IDLE;
|
1180 |
} |
1181 |
|
1182 |
void gdb_set_stop_cpu(CPUState *cpu)
|
1183 |
{ |
1184 |
gdbserver_state->c_cpu = cpu; |
1185 |
gdbserver_state->g_cpu = cpu; |
1186 |
} |
1187 |
|
1188 |
#ifndef CONFIG_USER_ONLY
|
1189 |
static void gdb_vm_state_change(void *opaque, int running, RunState state) |
1190 |
{ |
1191 |
GDBState *s = gdbserver_state; |
1192 |
CPUArchState *env = s->c_cpu->env_ptr; |
1193 |
CPUState *cpu = s->c_cpu; |
1194 |
char buf[256]; |
1195 |
const char *type; |
1196 |
int ret;
|
1197 |
|
1198 |
if (running || s->state == RS_INACTIVE) {
|
1199 |
return;
|
1200 |
} |
1201 |
/* Is there a GDB syscall waiting to be sent? */
|
1202 |
if (s->current_syscall_cb) {
|
1203 |
put_packet(s, s->syscall_buf); |
1204 |
return;
|
1205 |
} |
1206 |
switch (state) {
|
1207 |
case RUN_STATE_DEBUG:
|
1208 |
if (env->watchpoint_hit) {
|
1209 |
switch (env->watchpoint_hit->flags & BP_MEM_ACCESS) {
|
1210 |
case BP_MEM_READ:
|
1211 |
type = "r";
|
1212 |
break;
|
1213 |
case BP_MEM_ACCESS:
|
1214 |
type = "a";
|
1215 |
break;
|
1216 |
default:
|
1217 |
type = "";
|
1218 |
break;
|
1219 |
} |
1220 |
snprintf(buf, sizeof(buf),
|
1221 |
"T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";", |
1222 |
GDB_SIGNAL_TRAP, cpu_index(cpu), type, |
1223 |
env->watchpoint_hit->vaddr); |
1224 |
env->watchpoint_hit = NULL;
|
1225 |
goto send_packet;
|
1226 |
} |
1227 |
tb_flush(env); |
1228 |
ret = GDB_SIGNAL_TRAP; |
1229 |
break;
|
1230 |
case RUN_STATE_PAUSED:
|
1231 |
ret = GDB_SIGNAL_INT; |
1232 |
break;
|
1233 |
case RUN_STATE_SHUTDOWN:
|
1234 |
ret = GDB_SIGNAL_QUIT; |
1235 |
break;
|
1236 |
case RUN_STATE_IO_ERROR:
|
1237 |
ret = GDB_SIGNAL_IO; |
1238 |
break;
|
1239 |
case RUN_STATE_WATCHDOG:
|
1240 |
ret = GDB_SIGNAL_ALRM; |
1241 |
break;
|
1242 |
case RUN_STATE_INTERNAL_ERROR:
|
1243 |
ret = GDB_SIGNAL_ABRT; |
1244 |
break;
|
1245 |
case RUN_STATE_SAVE_VM:
|
1246 |
case RUN_STATE_RESTORE_VM:
|
1247 |
return;
|
1248 |
case RUN_STATE_FINISH_MIGRATE:
|
1249 |
ret = GDB_SIGNAL_XCPU; |
1250 |
break;
|
1251 |
default:
|
1252 |
ret = GDB_SIGNAL_UNKNOWN; |
1253 |
break;
|
1254 |
} |
1255 |
snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_index(cpu)); |
1256 |
|
1257 |
send_packet:
|
1258 |
put_packet(s, buf); |
1259 |
|
1260 |
/* disable single step if it was enabled */
|
1261 |
cpu_single_step(cpu, 0);
|
1262 |
} |
1263 |
#endif
|
1264 |
|
1265 |
/* Send a gdb syscall request.
|
1266 |
This accepts limited printf-style format specifiers, specifically:
|
1267 |
%x - target_ulong argument printed in hex.
|
1268 |
%lx - 64-bit argument printed in hex.
|
1269 |
%s - string pointer (target_ulong) and length (int) pair. */
|
1270 |
void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) |
1271 |
{ |
1272 |
va_list va; |
1273 |
char *p;
|
1274 |
char *p_end;
|
1275 |
target_ulong addr; |
1276 |
uint64_t i64; |
1277 |
GDBState *s; |
1278 |
|
1279 |
s = gdbserver_state; |
1280 |
if (!s)
|
1281 |
return;
|
1282 |
s->current_syscall_cb = cb; |
1283 |
#ifndef CONFIG_USER_ONLY
|
1284 |
vm_stop(RUN_STATE_DEBUG); |
1285 |
#endif
|
1286 |
va_start(va, fmt); |
1287 |
p = s->syscall_buf; |
1288 |
p_end = &s->syscall_buf[sizeof(s->syscall_buf)];
|
1289 |
*(p++) = 'F';
|
1290 |
while (*fmt) {
|
1291 |
if (*fmt == '%') { |
1292 |
fmt++; |
1293 |
switch (*fmt++) {
|
1294 |
case 'x': |
1295 |
addr = va_arg(va, target_ulong); |
1296 |
p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); |
1297 |
break;
|
1298 |
case 'l': |
1299 |
if (*(fmt++) != 'x') |
1300 |
goto bad_format;
|
1301 |
i64 = va_arg(va, uint64_t); |
1302 |
p += snprintf(p, p_end - p, "%" PRIx64, i64);
|
1303 |
break;
|
1304 |
case 's': |
1305 |
addr = va_arg(va, target_ulong); |
1306 |
p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x",
|
1307 |
addr, va_arg(va, int));
|
1308 |
break;
|
1309 |
default:
|
1310 |
bad_format:
|
1311 |
fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
|
1312 |
fmt - 1);
|
1313 |
break;
|
1314 |
} |
1315 |
} else {
|
1316 |
*(p++) = *(fmt++); |
1317 |
} |
1318 |
} |
1319 |
*p = 0;
|
1320 |
va_end(va); |
1321 |
#ifdef CONFIG_USER_ONLY
|
1322 |
put_packet(s, s->syscall_buf); |
1323 |
gdb_handlesig(s->c_cpu, 0);
|
1324 |
#else
|
1325 |
/* In this case wait to send the syscall packet until notification that
|
1326 |
the CPU has stopped. This must be done because if the packet is sent
|
1327 |
now the reply from the syscall request could be received while the CPU
|
1328 |
is still in the running state, which can cause packets to be dropped
|
1329 |
and state transition 'T' packets to be sent while the syscall is still
|
1330 |
being processed. */
|
1331 |
cpu_exit(s->c_cpu); |
1332 |
#endif
|
1333 |
} |
1334 |
|
1335 |
static void gdb_read_byte(GDBState *s, int ch) |
1336 |
{ |
1337 |
int i, csum;
|
1338 |
uint8_t reply; |
1339 |
|
1340 |
#ifndef CONFIG_USER_ONLY
|
1341 |
if (s->last_packet_len) {
|
1342 |
/* Waiting for a response to the last packet. If we see the start
|
1343 |
of a new command then abandon the previous response. */
|
1344 |
if (ch == '-') { |
1345 |
#ifdef DEBUG_GDB
|
1346 |
printf("Got NACK, retransmitting\n");
|
1347 |
#endif
|
1348 |
put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); |
1349 |
} |
1350 |
#ifdef DEBUG_GDB
|
1351 |
else if (ch == '+') |
1352 |
printf("Got ACK\n");
|
1353 |
else
|
1354 |
printf("Got '%c' when expecting ACK/NACK\n", ch);
|
1355 |
#endif
|
1356 |
if (ch == '+' || ch == '$') |
1357 |
s->last_packet_len = 0;
|
1358 |
if (ch != '$') |
1359 |
return;
|
1360 |
} |
1361 |
if (runstate_is_running()) {
|
1362 |
/* when the CPU is running, we cannot do anything except stop
|
1363 |
it when receiving a char */
|
1364 |
vm_stop(RUN_STATE_PAUSED); |
1365 |
} else
|
1366 |
#endif
|
1367 |
{ |
1368 |
switch(s->state) {
|
1369 |
case RS_IDLE:
|
1370 |
if (ch == '$') { |
1371 |
s->line_buf_index = 0;
|
1372 |
s->state = RS_GETLINE; |
1373 |
} |
1374 |
break;
|
1375 |
case RS_GETLINE:
|
1376 |
if (ch == '#') { |
1377 |
s->state = RS_CHKSUM1; |
1378 |
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { |
1379 |
s->state = RS_IDLE; |
1380 |
} else {
|
1381 |
s->line_buf[s->line_buf_index++] = ch; |
1382 |
} |
1383 |
break;
|
1384 |
case RS_CHKSUM1:
|
1385 |
s->line_buf[s->line_buf_index] = '\0';
|
1386 |
s->line_csum = fromhex(ch) << 4;
|
1387 |
s->state = RS_CHKSUM2; |
1388 |
break;
|
1389 |
case RS_CHKSUM2:
|
1390 |
s->line_csum |= fromhex(ch); |
1391 |
csum = 0;
|
1392 |
for(i = 0; i < s->line_buf_index; i++) { |
1393 |
csum += s->line_buf[i]; |
1394 |
} |
1395 |
if (s->line_csum != (csum & 0xff)) { |
1396 |
reply = '-';
|
1397 |
put_buffer(s, &reply, 1);
|
1398 |
s->state = RS_IDLE; |
1399 |
} else {
|
1400 |
reply = '+';
|
1401 |
put_buffer(s, &reply, 1);
|
1402 |
s->state = gdb_handle_packet(s, s->line_buf); |
1403 |
} |
1404 |
break;
|
1405 |
default:
|
1406 |
abort(); |
1407 |
} |
1408 |
} |
1409 |
} |
1410 |
|
1411 |
/* Tell the remote gdb that the process has exited. */
|
1412 |
void gdb_exit(CPUArchState *env, int code) |
1413 |
{ |
1414 |
GDBState *s; |
1415 |
char buf[4]; |
1416 |
|
1417 |
s = gdbserver_state; |
1418 |
if (!s) {
|
1419 |
return;
|
1420 |
} |
1421 |
#ifdef CONFIG_USER_ONLY
|
1422 |
if (gdbserver_fd < 0 || s->fd < 0) { |
1423 |
return;
|
1424 |
} |
1425 |
#endif
|
1426 |
|
1427 |
snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); |
1428 |
put_packet(s, buf); |
1429 |
|
1430 |
#ifndef CONFIG_USER_ONLY
|
1431 |
if (s->chr) {
|
1432 |
qemu_chr_delete(s->chr); |
1433 |
} |
1434 |
#endif
|
1435 |
} |
1436 |
|
1437 |
#ifdef CONFIG_USER_ONLY
|
1438 |
int
|
1439 |
gdb_queuesig (void)
|
1440 |
{ |
1441 |
GDBState *s; |
1442 |
|
1443 |
s = gdbserver_state; |
1444 |
|
1445 |
if (gdbserver_fd < 0 || s->fd < 0) |
1446 |
return 0; |
1447 |
else
|
1448 |
return 1; |
1449 |
} |
1450 |
|
1451 |
int
|
1452 |
gdb_handlesig(CPUState *cpu, int sig)
|
1453 |
{ |
1454 |
CPUArchState *env = cpu->env_ptr; |
1455 |
GDBState *s; |
1456 |
char buf[256]; |
1457 |
int n;
|
1458 |
|
1459 |
s = gdbserver_state; |
1460 |
if (gdbserver_fd < 0 || s->fd < 0) { |
1461 |
return sig;
|
1462 |
} |
1463 |
|
1464 |
/* disable single step if it was enabled */
|
1465 |
cpu_single_step(cpu, 0);
|
1466 |
tb_flush(env); |
1467 |
|
1468 |
if (sig != 0) { |
1469 |
snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig)); |
1470 |
put_packet(s, buf); |
1471 |
} |
1472 |
/* put_packet() might have detected that the peer terminated the
|
1473 |
connection. */
|
1474 |
if (s->fd < 0) { |
1475 |
return sig;
|
1476 |
} |
1477 |
|
1478 |
sig = 0;
|
1479 |
s->state = RS_IDLE; |
1480 |
s->running_state = 0;
|
1481 |
while (s->running_state == 0) { |
1482 |
n = read(s->fd, buf, 256);
|
1483 |
if (n > 0) { |
1484 |
int i;
|
1485 |
|
1486 |
for (i = 0; i < n; i++) { |
1487 |
gdb_read_byte(s, buf[i]); |
1488 |
} |
1489 |
} else if (n == 0 || errno != EAGAIN) { |
1490 |
/* XXX: Connection closed. Should probably wait for another
|
1491 |
connection before continuing. */
|
1492 |
return sig;
|
1493 |
} |
1494 |
} |
1495 |
sig = s->signal; |
1496 |
s->signal = 0;
|
1497 |
return sig;
|
1498 |
} |
1499 |
|
1500 |
/* Tell the remote gdb that the process has exited due to SIG. */
|
1501 |
void gdb_signalled(CPUArchState *env, int sig) |
1502 |
{ |
1503 |
GDBState *s; |
1504 |
char buf[4]; |
1505 |
|
1506 |
s = gdbserver_state; |
1507 |
if (gdbserver_fd < 0 || s->fd < 0) { |
1508 |
return;
|
1509 |
} |
1510 |
|
1511 |
snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); |
1512 |
put_packet(s, buf); |
1513 |
} |
1514 |
|
1515 |
static void gdb_accept(void) |
1516 |
{ |
1517 |
GDBState *s; |
1518 |
struct sockaddr_in sockaddr;
|
1519 |
socklen_t len; |
1520 |
int fd;
|
1521 |
|
1522 |
for(;;) {
|
1523 |
len = sizeof(sockaddr);
|
1524 |
fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
|
1525 |
if (fd < 0 && errno != EINTR) { |
1526 |
perror("accept");
|
1527 |
return;
|
1528 |
} else if (fd >= 0) { |
1529 |
#ifndef _WIN32
|
1530 |
fcntl(fd, F_SETFD, FD_CLOEXEC); |
1531 |
#endif
|
1532 |
break;
|
1533 |
} |
1534 |
} |
1535 |
|
1536 |
/* set short latency */
|
1537 |
socket_set_nodelay(fd); |
1538 |
|
1539 |
s = g_malloc0(sizeof(GDBState));
|
1540 |
s->c_cpu = first_cpu; |
1541 |
s->g_cpu = first_cpu; |
1542 |
s->fd = fd; |
1543 |
gdb_has_xml = false;
|
1544 |
|
1545 |
gdbserver_state = s; |
1546 |
|
1547 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
1548 |
} |
1549 |
|
1550 |
static int gdbserver_open(int port) |
1551 |
{ |
1552 |
struct sockaddr_in sockaddr;
|
1553 |
int fd, ret;
|
1554 |
|
1555 |
fd = socket(PF_INET, SOCK_STREAM, 0);
|
1556 |
if (fd < 0) { |
1557 |
perror("socket");
|
1558 |
return -1; |
1559 |
} |
1560 |
#ifndef _WIN32
|
1561 |
fcntl(fd, F_SETFD, FD_CLOEXEC); |
1562 |
#endif
|
1563 |
|
1564 |
socket_set_fast_reuse(fd); |
1565 |
|
1566 |
sockaddr.sin_family = AF_INET; |
1567 |
sockaddr.sin_port = htons(port); |
1568 |
sockaddr.sin_addr.s_addr = 0;
|
1569 |
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); |
1570 |
if (ret < 0) { |
1571 |
perror("bind");
|
1572 |
close(fd); |
1573 |
return -1; |
1574 |
} |
1575 |
ret = listen(fd, 0);
|
1576 |
if (ret < 0) { |
1577 |
perror("listen");
|
1578 |
close(fd); |
1579 |
return -1; |
1580 |
} |
1581 |
return fd;
|
1582 |
} |
1583 |
|
1584 |
int gdbserver_start(int port) |
1585 |
{ |
1586 |
gdbserver_fd = gdbserver_open(port); |
1587 |
if (gdbserver_fd < 0) |
1588 |
return -1; |
1589 |
/* accept connections */
|
1590 |
gdb_accept(); |
1591 |
return 0; |
1592 |
} |
1593 |
|
1594 |
/* Disable gdb stub for child processes. */
|
1595 |
void gdbserver_fork(CPUArchState *env)
|
1596 |
{ |
1597 |
GDBState *s = gdbserver_state; |
1598 |
if (gdbserver_fd < 0 || s->fd < 0) |
1599 |
return;
|
1600 |
close(s->fd); |
1601 |
s->fd = -1;
|
1602 |
cpu_breakpoint_remove_all(env, BP_GDB); |
1603 |
cpu_watchpoint_remove_all(env, BP_GDB); |
1604 |
} |
1605 |
#else
|
1606 |
static int gdb_chr_can_receive(void *opaque) |
1607 |
{ |
1608 |
/* We can handle an arbitrarily large amount of data.
|
1609 |
Pick the maximum packet size, which is as good as anything. */
|
1610 |
return MAX_PACKET_LENGTH;
|
1611 |
} |
1612 |
|
1613 |
static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size) |
1614 |
{ |
1615 |
int i;
|
1616 |
|
1617 |
for (i = 0; i < size; i++) { |
1618 |
gdb_read_byte(gdbserver_state, buf[i]); |
1619 |
} |
1620 |
} |
1621 |
|
1622 |
static void gdb_chr_event(void *opaque, int event) |
1623 |
{ |
1624 |
switch (event) {
|
1625 |
case CHR_EVENT_OPENED:
|
1626 |
vm_stop(RUN_STATE_PAUSED); |
1627 |
gdb_has_xml = false;
|
1628 |
break;
|
1629 |
default:
|
1630 |
break;
|
1631 |
} |
1632 |
} |
1633 |
|
1634 |
static void gdb_monitor_output(GDBState *s, const char *msg, int len) |
1635 |
{ |
1636 |
char buf[MAX_PACKET_LENGTH];
|
1637 |
|
1638 |
buf[0] = 'O'; |
1639 |
if (len > (MAX_PACKET_LENGTH/2) - 1) |
1640 |
len = (MAX_PACKET_LENGTH/2) - 1; |
1641 |
memtohex(buf + 1, (uint8_t *)msg, len);
|
1642 |
put_packet(s, buf); |
1643 |
} |
1644 |
|
1645 |
static int gdb_monitor_write(CharDriverState *chr, const uint8_t *buf, int len) |
1646 |
{ |
1647 |
const char *p = (const char *)buf; |
1648 |
int max_sz;
|
1649 |
|
1650 |
max_sz = (sizeof(gdbserver_state->last_packet) - 2) / 2; |
1651 |
for (;;) {
|
1652 |
if (len <= max_sz) {
|
1653 |
gdb_monitor_output(gdbserver_state, p, len); |
1654 |
break;
|
1655 |
} |
1656 |
gdb_monitor_output(gdbserver_state, p, max_sz); |
1657 |
p += max_sz; |
1658 |
len -= max_sz; |
1659 |
} |
1660 |
return len;
|
1661 |
} |
1662 |
|
1663 |
#ifndef _WIN32
|
1664 |
static void gdb_sigterm_handler(int signal) |
1665 |
{ |
1666 |
if (runstate_is_running()) {
|
1667 |
vm_stop(RUN_STATE_PAUSED); |
1668 |
} |
1669 |
} |
1670 |
#endif
|
1671 |
|
1672 |
int gdbserver_start(const char *device) |
1673 |
{ |
1674 |
GDBState *s; |
1675 |
char gdbstub_device_name[128]; |
1676 |
CharDriverState *chr = NULL;
|
1677 |
CharDriverState *mon_chr; |
1678 |
|
1679 |
if (!device)
|
1680 |
return -1; |
1681 |
if (strcmp(device, "none") != 0) { |
1682 |
if (strstart(device, "tcp:", NULL)) { |
1683 |
/* enforce required TCP attributes */
|
1684 |
snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
|
1685 |
"%s,nowait,nodelay,server", device);
|
1686 |
device = gdbstub_device_name; |
1687 |
} |
1688 |
#ifndef _WIN32
|
1689 |
else if (strcmp(device, "stdio") == 0) { |
1690 |
struct sigaction act;
|
1691 |
|
1692 |
memset(&act, 0, sizeof(act)); |
1693 |
act.sa_handler = gdb_sigterm_handler; |
1694 |
sigaction(SIGINT, &act, NULL);
|
1695 |
} |
1696 |
#endif
|
1697 |
chr = qemu_chr_new("gdb", device, NULL); |
1698 |
if (!chr)
|
1699 |
return -1; |
1700 |
|
1701 |
qemu_chr_fe_claim_no_fail(chr); |
1702 |
qemu_chr_add_handlers(chr, gdb_chr_can_receive, gdb_chr_receive, |
1703 |
gdb_chr_event, NULL);
|
1704 |
} |
1705 |
|
1706 |
s = gdbserver_state; |
1707 |
if (!s) {
|
1708 |
s = g_malloc0(sizeof(GDBState));
|
1709 |
gdbserver_state = s; |
1710 |
|
1711 |
qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
|
1712 |
|
1713 |
/* Initialize a monitor terminal for gdb */
|
1714 |
mon_chr = g_malloc0(sizeof(*mon_chr));
|
1715 |
mon_chr->chr_write = gdb_monitor_write; |
1716 |
monitor_init(mon_chr, 0);
|
1717 |
} else {
|
1718 |
if (s->chr)
|
1719 |
qemu_chr_delete(s->chr); |
1720 |
mon_chr = s->mon_chr; |
1721 |
memset(s, 0, sizeof(GDBState)); |
1722 |
} |
1723 |
s->c_cpu = first_cpu; |
1724 |
s->g_cpu = first_cpu; |
1725 |
s->chr = chr; |
1726 |
s->state = chr ? RS_IDLE : RS_INACTIVE; |
1727 |
s->mon_chr = mon_chr; |
1728 |
s->current_syscall_cb = NULL;
|
1729 |
|
1730 |
return 0; |
1731 |
} |
1732 |
#endif
|