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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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|
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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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|
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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) |
254 |
{ |
255 |
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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|
263 |
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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272 |
|
273 |
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; |
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struct GDBRegisterState *next;
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} GDBRegisterState; |
281 |
|
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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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int signal;
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#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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} |
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
|
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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_check(RUN_STATE_GUEST_PANICKED)) {
|
372 |
runstate_set(RUN_STATE_DEBUG); |
373 |
} |
374 |
if (!runstate_needs_reset()) {
|
375 |
vm_start(); |
376 |
} |
377 |
#endif
|
378 |
} |
379 |
|
380 |
static void put_buffer(GDBState *s, const uint8_t *buf, int len) |
381 |
{ |
382 |
#ifdef CONFIG_USER_ONLY
|
383 |
int ret;
|
384 |
|
385 |
while (len > 0) { |
386 |
ret = send(s->fd, buf, len, 0);
|
387 |
if (ret < 0) { |
388 |
if (errno != EINTR && errno != EAGAIN)
|
389 |
return;
|
390 |
} else {
|
391 |
buf += ret; |
392 |
len -= ret; |
393 |
} |
394 |
} |
395 |
#else
|
396 |
qemu_chr_fe_write(s->chr, buf, len); |
397 |
#endif
|
398 |
} |
399 |
|
400 |
static inline int fromhex(int v) |
401 |
{ |
402 |
if (v >= '0' && v <= '9') |
403 |
return v - '0'; |
404 |
else if (v >= 'A' && v <= 'F') |
405 |
return v - 'A' + 10; |
406 |
else if (v >= 'a' && v <= 'f') |
407 |
return v - 'a' + 10; |
408 |
else
|
409 |
return 0; |
410 |
} |
411 |
|
412 |
static inline int tohex(int v) |
413 |
{ |
414 |
if (v < 10) |
415 |
return v + '0'; |
416 |
else
|
417 |
return v - 10 + 'a'; |
418 |
} |
419 |
|
420 |
static void memtohex(char *buf, const uint8_t *mem, int len) |
421 |
{ |
422 |
int i, c;
|
423 |
char *q;
|
424 |
q = buf; |
425 |
for(i = 0; i < len; i++) { |
426 |
c = mem[i]; |
427 |
*q++ = tohex(c >> 4);
|
428 |
*q++ = tohex(c & 0xf);
|
429 |
} |
430 |
*q = '\0';
|
431 |
} |
432 |
|
433 |
static void hextomem(uint8_t *mem, const char *buf, int len) |
434 |
{ |
435 |
int i;
|
436 |
|
437 |
for(i = 0; i < len; i++) { |
438 |
mem[i] = (fromhex(buf[0]) << 4) | fromhex(buf[1]); |
439 |
buf += 2;
|
440 |
} |
441 |
} |
442 |
|
443 |
/* return -1 if error, 0 if OK */
|
444 |
static int put_packet_binary(GDBState *s, const char *buf, int len) |
445 |
{ |
446 |
int csum, i;
|
447 |
uint8_t *p; |
448 |
|
449 |
for(;;) {
|
450 |
p = s->last_packet; |
451 |
*(p++) = '$';
|
452 |
memcpy(p, buf, len); |
453 |
p += len; |
454 |
csum = 0;
|
455 |
for(i = 0; i < len; i++) { |
456 |
csum += buf[i]; |
457 |
} |
458 |
*(p++) = '#';
|
459 |
*(p++) = tohex((csum >> 4) & 0xf); |
460 |
*(p++) = tohex((csum) & 0xf);
|
461 |
|
462 |
s->last_packet_len = p - s->last_packet; |
463 |
put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); |
464 |
|
465 |
#ifdef CONFIG_USER_ONLY
|
466 |
i = get_char(s); |
467 |
if (i < 0) |
468 |
return -1; |
469 |
if (i == '+') |
470 |
break;
|
471 |
#else
|
472 |
break;
|
473 |
#endif
|
474 |
} |
475 |
return 0; |
476 |
} |
477 |
|
478 |
/* return -1 if error, 0 if OK */
|
479 |
static int put_packet(GDBState *s, const char *buf) |
480 |
{ |
481 |
#ifdef DEBUG_GDB
|
482 |
printf("reply='%s'\n", buf);
|
483 |
#endif
|
484 |
|
485 |
return put_packet_binary(s, buf, strlen(buf));
|
486 |
} |
487 |
|
488 |
/* Encode data using the encoding for 'x' packets. */
|
489 |
static int memtox(char *buf, const char *mem, int len) |
490 |
{ |
491 |
char *p = buf;
|
492 |
char c;
|
493 |
|
494 |
while (len--) {
|
495 |
c = *(mem++); |
496 |
switch (c) {
|
497 |
case '#': case '$': case '*': case '}': |
498 |
*(p++) = '}';
|
499 |
*(p++) = c ^ 0x20;
|
500 |
break;
|
501 |
default:
|
502 |
*(p++) = c; |
503 |
break;
|
504 |
} |
505 |
} |
506 |
return p - buf;
|
507 |
} |
508 |
|
509 |
static const char *get_feature_xml(const char *p, const char **newp, |
510 |
CPUClass *cc) |
511 |
{ |
512 |
size_t len; |
513 |
int i;
|
514 |
const char *name; |
515 |
static char target_xml[1024]; |
516 |
|
517 |
len = 0;
|
518 |
while (p[len] && p[len] != ':') |
519 |
len++; |
520 |
*newp = p + len; |
521 |
|
522 |
name = NULL;
|
523 |
if (strncmp(p, "target.xml", len) == 0) { |
524 |
/* Generate the XML description for this CPU. */
|
525 |
if (!target_xml[0]) { |
526 |
GDBRegisterState *r; |
527 |
CPUState *cpu = first_cpu; |
528 |
|
529 |
snprintf(target_xml, sizeof(target_xml),
|
530 |
"<?xml version=\"1.0\"?>"
|
531 |
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
|
532 |
"<target>"
|
533 |
"<xi:include href=\"%s\"/>",
|
534 |
cc->gdb_core_xml_file); |
535 |
|
536 |
for (r = cpu->gdb_regs; r; r = r->next) {
|
537 |
pstrcat(target_xml, sizeof(target_xml), "<xi:include href=\""); |
538 |
pstrcat(target_xml, sizeof(target_xml), r->xml);
|
539 |
pstrcat(target_xml, sizeof(target_xml), "\"/>"); |
540 |
} |
541 |
pstrcat(target_xml, sizeof(target_xml), "</target>"); |
542 |
} |
543 |
return target_xml;
|
544 |
} |
545 |
for (i = 0; ; i++) { |
546 |
name = xml_builtin[i][0];
|
547 |
if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len)) |
548 |
break;
|
549 |
} |
550 |
return name ? xml_builtin[i][1] : NULL; |
551 |
} |
552 |
|
553 |
static int gdb_read_register(CPUState *cpu, uint8_t *mem_buf, int reg) |
554 |
{ |
555 |
CPUClass *cc = CPU_GET_CLASS(cpu); |
556 |
CPUArchState *env = cpu->env_ptr; |
557 |
GDBRegisterState *r; |
558 |
|
559 |
if (reg < cc->gdb_num_core_regs) {
|
560 |
return cc->gdb_read_register(cpu, mem_buf, reg);
|
561 |
} |
562 |
|
563 |
for (r = cpu->gdb_regs; r; r = r->next) {
|
564 |
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
|
565 |
return r->get_reg(env, mem_buf, reg - r->base_reg);
|
566 |
} |
567 |
} |
568 |
return 0; |
569 |
} |
570 |
|
571 |
static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) |
572 |
{ |
573 |
CPUClass *cc = CPU_GET_CLASS(cpu); |
574 |
CPUArchState *env = cpu->env_ptr; |
575 |
GDBRegisterState *r; |
576 |
|
577 |
if (reg < cc->gdb_num_core_regs) {
|
578 |
return cc->gdb_write_register(cpu, mem_buf, reg);
|
579 |
} |
580 |
|
581 |
for (r = cpu->gdb_regs; r; r = r->next) {
|
582 |
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
|
583 |
return r->set_reg(env, mem_buf, reg - r->base_reg);
|
584 |
} |
585 |
} |
586 |
return 0; |
587 |
} |
588 |
|
589 |
/* Register a supplemental set of CPU registers. If g_pos is nonzero it
|
590 |
specifies the first register number and these registers are included in
|
591 |
a standard "g" packet. Direction is relative to gdb, i.e. get_reg is
|
592 |
gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
|
593 |
*/
|
594 |
|
595 |
void gdb_register_coprocessor(CPUState *cpu,
|
596 |
gdb_reg_cb get_reg, gdb_reg_cb set_reg, |
597 |
int num_regs, const char *xml, int g_pos) |
598 |
{ |
599 |
GDBRegisterState *s; |
600 |
GDBRegisterState **p; |
601 |
|
602 |
p = &cpu->gdb_regs; |
603 |
while (*p) {
|
604 |
/* Check for duplicates. */
|
605 |
if (strcmp((*p)->xml, xml) == 0) |
606 |
return;
|
607 |
p = &(*p)->next; |
608 |
} |
609 |
|
610 |
s = g_new0(GDBRegisterState, 1);
|
611 |
s->base_reg = cpu->gdb_num_regs; |
612 |
s->num_regs = num_regs; |
613 |
s->get_reg = get_reg; |
614 |
s->set_reg = set_reg; |
615 |
s->xml = xml; |
616 |
|
617 |
/* Add to end of list. */
|
618 |
cpu->gdb_num_regs += num_regs; |
619 |
*p = s; |
620 |
if (g_pos) {
|
621 |
if (g_pos != s->base_reg) {
|
622 |
fprintf(stderr, "Error: Bad gdb register numbering for '%s'\n"
|
623 |
"Expected %d got %d\n", xml, g_pos, s->base_reg);
|
624 |
} |
625 |
} |
626 |
} |
627 |
|
628 |
#ifndef CONFIG_USER_ONLY
|
629 |
static const int xlat_gdb_type[] = { |
630 |
[GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE, |
631 |
[GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ, |
632 |
[GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS, |
633 |
}; |
634 |
#endif
|
635 |
|
636 |
static int gdb_breakpoint_insert(target_ulong addr, target_ulong len, int type) |
637 |
{ |
638 |
CPUState *cpu; |
639 |
CPUArchState *env; |
640 |
int err = 0; |
641 |
|
642 |
if (kvm_enabled()) {
|
643 |
return kvm_insert_breakpoint(gdbserver_state->c_cpu, addr, len, type);
|
644 |
} |
645 |
|
646 |
switch (type) {
|
647 |
case GDB_BREAKPOINT_SW:
|
648 |
case GDB_BREAKPOINT_HW:
|
649 |
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) { |
650 |
env = cpu->env_ptr; |
651 |
err = cpu_breakpoint_insert(env, addr, BP_GDB, NULL);
|
652 |
if (err)
|
653 |
break;
|
654 |
} |
655 |
return err;
|
656 |
#ifndef CONFIG_USER_ONLY
|
657 |
case GDB_WATCHPOINT_WRITE:
|
658 |
case GDB_WATCHPOINT_READ:
|
659 |
case GDB_WATCHPOINT_ACCESS:
|
660 |
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) { |
661 |
env = cpu->env_ptr; |
662 |
err = cpu_watchpoint_insert(env, addr, len, xlat_gdb_type[type], |
663 |
NULL);
|
664 |
if (err)
|
665 |
break;
|
666 |
} |
667 |
return err;
|
668 |
#endif
|
669 |
default:
|
670 |
return -ENOSYS;
|
671 |
} |
672 |
} |
673 |
|
674 |
static int gdb_breakpoint_remove(target_ulong addr, target_ulong len, int type) |
675 |
{ |
676 |
CPUState *cpu; |
677 |
CPUArchState *env; |
678 |
int err = 0; |
679 |
|
680 |
if (kvm_enabled()) {
|
681 |
return kvm_remove_breakpoint(gdbserver_state->c_cpu, addr, len, type);
|
682 |
} |
683 |
|
684 |
switch (type) {
|
685 |
case GDB_BREAKPOINT_SW:
|
686 |
case GDB_BREAKPOINT_HW:
|
687 |
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) { |
688 |
env = cpu->env_ptr; |
689 |
err = cpu_breakpoint_remove(env, addr, BP_GDB); |
690 |
if (err)
|
691 |
break;
|
692 |
} |
693 |
return err;
|
694 |
#ifndef CONFIG_USER_ONLY
|
695 |
case GDB_WATCHPOINT_WRITE:
|
696 |
case GDB_WATCHPOINT_READ:
|
697 |
case GDB_WATCHPOINT_ACCESS:
|
698 |
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) { |
699 |
env = cpu->env_ptr; |
700 |
err = cpu_watchpoint_remove(env, addr, len, xlat_gdb_type[type]); |
701 |
if (err)
|
702 |
break;
|
703 |
} |
704 |
return err;
|
705 |
#endif
|
706 |
default:
|
707 |
return -ENOSYS;
|
708 |
} |
709 |
} |
710 |
|
711 |
static void gdb_breakpoint_remove_all(void) |
712 |
{ |
713 |
CPUState *cpu; |
714 |
CPUArchState *env; |
715 |
|
716 |
if (kvm_enabled()) {
|
717 |
kvm_remove_all_breakpoints(gdbserver_state->c_cpu); |
718 |
return;
|
719 |
} |
720 |
|
721 |
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) { |
722 |
env = cpu->env_ptr; |
723 |
cpu_breakpoint_remove_all(env, BP_GDB); |
724 |
#ifndef CONFIG_USER_ONLY
|
725 |
cpu_watchpoint_remove_all(env, BP_GDB); |
726 |
#endif
|
727 |
} |
728 |
} |
729 |
|
730 |
static void gdb_set_cpu_pc(GDBState *s, target_ulong pc) |
731 |
{ |
732 |
CPUState *cpu = s->c_cpu; |
733 |
CPUClass *cc = CPU_GET_CLASS(cpu); |
734 |
|
735 |
cpu_synchronize_state(cpu); |
736 |
if (cc->set_pc) {
|
737 |
cc->set_pc(cpu, pc); |
738 |
} |
739 |
} |
740 |
|
741 |
static CPUState *find_cpu(uint32_t thread_id)
|
742 |
{ |
743 |
CPUState *cpu; |
744 |
|
745 |
for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) { |
746 |
if (cpu_index(cpu) == thread_id) {
|
747 |
return cpu;
|
748 |
} |
749 |
} |
750 |
|
751 |
return NULL; |
752 |
} |
753 |
|
754 |
static int gdb_handle_packet(GDBState *s, const char *line_buf) |
755 |
{ |
756 |
CPUState *cpu; |
757 |
CPUClass *cc; |
758 |
const char *p; |
759 |
uint32_t thread; |
760 |
int ch, reg_size, type, res;
|
761 |
char buf[MAX_PACKET_LENGTH];
|
762 |
uint8_t mem_buf[MAX_PACKET_LENGTH]; |
763 |
uint8_t *registers; |
764 |
target_ulong addr, len; |
765 |
|
766 |
#ifdef DEBUG_GDB
|
767 |
printf("command='%s'\n", line_buf);
|
768 |
#endif
|
769 |
p = line_buf; |
770 |
ch = *p++; |
771 |
switch(ch) {
|
772 |
case '?': |
773 |
/* TODO: Make this return the correct value for user-mode. */
|
774 |
snprintf(buf, sizeof(buf), "T%02xthread:%02x;", GDB_SIGNAL_TRAP, |
775 |
cpu_index(s->c_cpu)); |
776 |
put_packet(s, buf); |
777 |
/* Remove all the breakpoints when this query is issued,
|
778 |
* because gdb is doing and initial connect and the state
|
779 |
* should be cleaned up.
|
780 |
*/
|
781 |
gdb_breakpoint_remove_all(); |
782 |
break;
|
783 |
case 'c': |
784 |
if (*p != '\0') { |
785 |
addr = strtoull(p, (char **)&p, 16); |
786 |
gdb_set_cpu_pc(s, addr); |
787 |
} |
788 |
s->signal = 0;
|
789 |
gdb_continue(s); |
790 |
return RS_IDLE;
|
791 |
case 'C': |
792 |
s->signal = gdb_signal_to_target (strtoul(p, (char **)&p, 16)); |
793 |
if (s->signal == -1) |
794 |
s->signal = 0;
|
795 |
gdb_continue(s); |
796 |
return RS_IDLE;
|
797 |
case 'v': |
798 |
if (strncmp(p, "Cont", 4) == 0) { |
799 |
int res_signal, res_thread;
|
800 |
|
801 |
p += 4;
|
802 |
if (*p == '?') { |
803 |
put_packet(s, "vCont;c;C;s;S");
|
804 |
break;
|
805 |
} |
806 |
res = 0;
|
807 |
res_signal = 0;
|
808 |
res_thread = 0;
|
809 |
while (*p) {
|
810 |
int action, signal;
|
811 |
|
812 |
if (*p++ != ';') { |
813 |
res = 0;
|
814 |
break;
|
815 |
} |
816 |
action = *p++; |
817 |
signal = 0;
|
818 |
if (action == 'C' || action == 'S') { |
819 |
signal = strtoul(p, (char **)&p, 16); |
820 |
} else if (action != 'c' && action != 's') { |
821 |
res = 0;
|
822 |
break;
|
823 |
} |
824 |
thread = 0;
|
825 |
if (*p == ':') { |
826 |
thread = strtoull(p+1, (char **)&p, 16); |
827 |
} |
828 |
action = tolower(action); |
829 |
if (res == 0 || (res == 'c' && action == 's')) { |
830 |
res = action; |
831 |
res_signal = signal; |
832 |
res_thread = thread; |
833 |
} |
834 |
} |
835 |
if (res) {
|
836 |
if (res_thread != -1 && res_thread != 0) { |
837 |
cpu = find_cpu(res_thread); |
838 |
if (cpu == NULL) { |
839 |
put_packet(s, "E22");
|
840 |
break;
|
841 |
} |
842 |
s->c_cpu = cpu; |
843 |
} |
844 |
if (res == 's') { |
845 |
cpu_single_step(s->c_cpu, sstep_flags); |
846 |
} |
847 |
s->signal = res_signal; |
848 |
gdb_continue(s); |
849 |
return RS_IDLE;
|
850 |
} |
851 |
break;
|
852 |
} else {
|
853 |
goto unknown_command;
|
854 |
} |
855 |
case 'k': |
856 |
#ifdef CONFIG_USER_ONLY
|
857 |
/* Kill the target */
|
858 |
fprintf(stderr, "\nQEMU: Terminated via GDBstub\n");
|
859 |
exit(0);
|
860 |
#endif
|
861 |
case 'D': |
862 |
/* Detach packet */
|
863 |
gdb_breakpoint_remove_all(); |
864 |
gdb_syscall_mode = GDB_SYS_DISABLED; |
865 |
gdb_continue(s); |
866 |
put_packet(s, "OK");
|
867 |
break;
|
868 |
case 's': |
869 |
if (*p != '\0') { |
870 |
addr = strtoull(p, (char **)&p, 16); |
871 |
gdb_set_cpu_pc(s, addr); |
872 |
} |
873 |
cpu_single_step(s->c_cpu, sstep_flags); |
874 |
gdb_continue(s); |
875 |
return RS_IDLE;
|
876 |
case 'F': |
877 |
{ |
878 |
target_ulong ret; |
879 |
target_ulong err; |
880 |
|
881 |
ret = strtoull(p, (char **)&p, 16); |
882 |
if (*p == ',') { |
883 |
p++; |
884 |
err = strtoull(p, (char **)&p, 16); |
885 |
} else {
|
886 |
err = 0;
|
887 |
} |
888 |
if (*p == ',') |
889 |
p++; |
890 |
type = *p; |
891 |
if (s->current_syscall_cb) {
|
892 |
s->current_syscall_cb(s->c_cpu, ret, err); |
893 |
s->current_syscall_cb = NULL;
|
894 |
} |
895 |
if (type == 'C') { |
896 |
put_packet(s, "T02");
|
897 |
} else {
|
898 |
gdb_continue(s); |
899 |
} |
900 |
} |
901 |
break;
|
902 |
case 'g': |
903 |
cpu_synchronize_state(s->g_cpu); |
904 |
len = 0;
|
905 |
for (addr = 0; addr < s->g_cpu->gdb_num_regs; addr++) { |
906 |
reg_size = gdb_read_register(s->g_cpu, mem_buf + len, addr); |
907 |
len += reg_size; |
908 |
} |
909 |
memtohex(buf, mem_buf, len); |
910 |
put_packet(s, buf); |
911 |
break;
|
912 |
case 'G': |
913 |
cpu_synchronize_state(s->g_cpu); |
914 |
registers = mem_buf; |
915 |
len = strlen(p) / 2;
|
916 |
hextomem((uint8_t *)registers, p, len); |
917 |
for (addr = 0; addr < s->g_cpu->gdb_num_regs && len > 0; addr++) { |
918 |
reg_size = gdb_write_register(s->g_cpu, registers, addr); |
919 |
len -= reg_size; |
920 |
registers += reg_size; |
921 |
} |
922 |
put_packet(s, "OK");
|
923 |
break;
|
924 |
case 'm': |
925 |
addr = strtoull(p, (char **)&p, 16); |
926 |
if (*p == ',') |
927 |
p++; |
928 |
len = strtoull(p, NULL, 16); |
929 |
if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len, false) != 0) { |
930 |
put_packet (s, "E14");
|
931 |
} else {
|
932 |
memtohex(buf, mem_buf, len); |
933 |
put_packet(s, buf); |
934 |
} |
935 |
break;
|
936 |
case 'M': |
937 |
addr = strtoull(p, (char **)&p, 16); |
938 |
if (*p == ',') |
939 |
p++; |
940 |
len = strtoull(p, (char **)&p, 16); |
941 |
if (*p == ':') |
942 |
p++; |
943 |
hextomem(mem_buf, p, len); |
944 |
if (target_memory_rw_debug(s->g_cpu, addr, mem_buf, len,
|
945 |
true) != 0) { |
946 |
put_packet(s, "E14");
|
947 |
} else {
|
948 |
put_packet(s, "OK");
|
949 |
} |
950 |
break;
|
951 |
case 'p': |
952 |
/* Older gdb are really dumb, and don't use 'g' if 'p' is avaialable.
|
953 |
This works, but can be very slow. Anything new enough to
|
954 |
understand XML also knows how to use this properly. */
|
955 |
if (!gdb_has_xml)
|
956 |
goto unknown_command;
|
957 |
addr = strtoull(p, (char **)&p, 16); |
958 |
reg_size = gdb_read_register(s->g_cpu, mem_buf, addr); |
959 |
if (reg_size) {
|
960 |
memtohex(buf, mem_buf, reg_size); |
961 |
put_packet(s, buf); |
962 |
} else {
|
963 |
put_packet(s, "E14");
|
964 |
} |
965 |
break;
|
966 |
case 'P': |
967 |
if (!gdb_has_xml)
|
968 |
goto unknown_command;
|
969 |
addr = strtoull(p, (char **)&p, 16); |
970 |
if (*p == '=') |
971 |
p++; |
972 |
reg_size = strlen(p) / 2;
|
973 |
hextomem(mem_buf, p, reg_size); |
974 |
gdb_write_register(s->g_cpu, mem_buf, addr); |
975 |
put_packet(s, "OK");
|
976 |
break;
|
977 |
case 'Z': |
978 |
case 'z': |
979 |
type = strtoul(p, (char **)&p, 16); |
980 |
if (*p == ',') |
981 |
p++; |
982 |
addr = strtoull(p, (char **)&p, 16); |
983 |
if (*p == ',') |
984 |
p++; |
985 |
len = strtoull(p, (char **)&p, 16); |
986 |
if (ch == 'Z') |
987 |
res = gdb_breakpoint_insert(addr, len, type); |
988 |
else
|
989 |
res = gdb_breakpoint_remove(addr, len, type); |
990 |
if (res >= 0) |
991 |
put_packet(s, "OK");
|
992 |
else if (res == -ENOSYS) |
993 |
put_packet(s, "");
|
994 |
else
|
995 |
put_packet(s, "E22");
|
996 |
break;
|
997 |
case 'H': |
998 |
type = *p++; |
999 |
thread = strtoull(p, (char **)&p, 16); |
1000 |
if (thread == -1 || thread == 0) { |
1001 |
put_packet(s, "OK");
|
1002 |
break;
|
1003 |
} |
1004 |
cpu = find_cpu(thread); |
1005 |
if (cpu == NULL) { |
1006 |
put_packet(s, "E22");
|
1007 |
break;
|
1008 |
} |
1009 |
switch (type) {
|
1010 |
case 'c': |
1011 |
s->c_cpu = cpu; |
1012 |
put_packet(s, "OK");
|
1013 |
break;
|
1014 |
case 'g': |
1015 |
s->g_cpu = cpu; |
1016 |
put_packet(s, "OK");
|
1017 |
break;
|
1018 |
default:
|
1019 |
put_packet(s, "E22");
|
1020 |
break;
|
1021 |
} |
1022 |
break;
|
1023 |
case 'T': |
1024 |
thread = strtoull(p, (char **)&p, 16); |
1025 |
cpu = find_cpu(thread); |
1026 |
|
1027 |
if (cpu != NULL) { |
1028 |
put_packet(s, "OK");
|
1029 |
} else {
|
1030 |
put_packet(s, "E22");
|
1031 |
} |
1032 |
break;
|
1033 |
case 'q': |
1034 |
case 'Q': |
1035 |
/* parse any 'q' packets here */
|
1036 |
if (!strcmp(p,"qemu.sstepbits")) { |
1037 |
/* Query Breakpoint bit definitions */
|
1038 |
snprintf(buf, sizeof(buf), "ENABLE=%x,NOIRQ=%x,NOTIMER=%x", |
1039 |
SSTEP_ENABLE, |
1040 |
SSTEP_NOIRQ, |
1041 |
SSTEP_NOTIMER); |
1042 |
put_packet(s, buf); |
1043 |
break;
|
1044 |
} else if (strncmp(p,"qemu.sstep",10) == 0) { |
1045 |
/* Display or change the sstep_flags */
|
1046 |
p += 10;
|
1047 |
if (*p != '=') { |
1048 |
/* Display current setting */
|
1049 |
snprintf(buf, sizeof(buf), "0x%x", sstep_flags); |
1050 |
put_packet(s, buf); |
1051 |
break;
|
1052 |
} |
1053 |
p++; |
1054 |
type = strtoul(p, (char **)&p, 16); |
1055 |
sstep_flags = type; |
1056 |
put_packet(s, "OK");
|
1057 |
break;
|
1058 |
} else if (strcmp(p,"C") == 0) { |
1059 |
/* "Current thread" remains vague in the spec, so always return
|
1060 |
* the first CPU (gdb returns the first thread). */
|
1061 |
put_packet(s, "QC1");
|
1062 |
break;
|
1063 |
} else if (strcmp(p,"fThreadInfo") == 0) { |
1064 |
s->query_cpu = first_cpu; |
1065 |
goto report_cpuinfo;
|
1066 |
} else if (strcmp(p,"sThreadInfo") == 0) { |
1067 |
report_cpuinfo:
|
1068 |
if (s->query_cpu) {
|
1069 |
snprintf(buf, sizeof(buf), "m%x", cpu_index(s->query_cpu)); |
1070 |
put_packet(s, buf); |
1071 |
s->query_cpu = s->query_cpu->next_cpu; |
1072 |
} else
|
1073 |
put_packet(s, "l");
|
1074 |
break;
|
1075 |
} else if (strncmp(p,"ThreadExtraInfo,", 16) == 0) { |
1076 |
thread = strtoull(p+16, (char **)&p, 16); |
1077 |
cpu = find_cpu(thread); |
1078 |
if (cpu != NULL) { |
1079 |
cpu_synchronize_state(cpu); |
1080 |
len = snprintf((char *)mem_buf, sizeof(mem_buf), |
1081 |
"CPU#%d [%s]", cpu->cpu_index,
|
1082 |
cpu->halted ? "halted " : "running"); |
1083 |
memtohex(buf, mem_buf, len); |
1084 |
put_packet(s, buf); |
1085 |
} |
1086 |
break;
|
1087 |
} |
1088 |
#ifdef CONFIG_USER_ONLY
|
1089 |
else if (strncmp(p, "Offsets", 7) == 0) { |
1090 |
CPUArchState *env = s->c_cpu->env_ptr; |
1091 |
TaskState *ts = env->opaque; |
1092 |
|
1093 |
snprintf(buf, sizeof(buf),
|
1094 |
"Text=" TARGET_ABI_FMT_lx ";Data=" TARGET_ABI_FMT_lx |
1095 |
";Bss=" TARGET_ABI_FMT_lx,
|
1096 |
ts->info->code_offset, |
1097 |
ts->info->data_offset, |
1098 |
ts->info->data_offset); |
1099 |
put_packet(s, buf); |
1100 |
break;
|
1101 |
} |
1102 |
#else /* !CONFIG_USER_ONLY */ |
1103 |
else if (strncmp(p, "Rcmd,", 5) == 0) { |
1104 |
int len = strlen(p + 5); |
1105 |
|
1106 |
if ((len % 2) != 0) { |
1107 |
put_packet(s, "E01");
|
1108 |
break;
|
1109 |
} |
1110 |
hextomem(mem_buf, p + 5, len);
|
1111 |
len = len / 2;
|
1112 |
mem_buf[len++] = 0;
|
1113 |
qemu_chr_be_write(s->mon_chr, mem_buf, len); |
1114 |
put_packet(s, "OK");
|
1115 |
break;
|
1116 |
} |
1117 |
#endif /* !CONFIG_USER_ONLY */ |
1118 |
if (strncmp(p, "Supported", 9) == 0) { |
1119 |
snprintf(buf, sizeof(buf), "PacketSize=%x", MAX_PACKET_LENGTH); |
1120 |
cc = CPU_GET_CLASS(first_cpu); |
1121 |
if (cc->gdb_core_xml_file != NULL) { |
1122 |
pstrcat(buf, sizeof(buf), ";qXfer:features:read+"); |
1123 |
} |
1124 |
put_packet(s, buf); |
1125 |
break;
|
1126 |
} |
1127 |
if (strncmp(p, "Xfer:features:read:", 19) == 0) { |
1128 |
const char *xml; |
1129 |
target_ulong total_len; |
1130 |
|
1131 |
cc = CPU_GET_CLASS(first_cpu); |
1132 |
if (cc->gdb_core_xml_file == NULL) { |
1133 |
goto unknown_command;
|
1134 |
} |
1135 |
|
1136 |
gdb_has_xml = true;
|
1137 |
p += 19;
|
1138 |
xml = get_feature_xml(p, &p, cc); |
1139 |
if (!xml) {
|
1140 |
snprintf(buf, sizeof(buf), "E00"); |
1141 |
put_packet(s, buf); |
1142 |
break;
|
1143 |
} |
1144 |
|
1145 |
if (*p == ':') |
1146 |
p++; |
1147 |
addr = strtoul(p, (char **)&p, 16); |
1148 |
if (*p == ',') |
1149 |
p++; |
1150 |
len = strtoul(p, (char **)&p, 16); |
1151 |
|
1152 |
total_len = strlen(xml); |
1153 |
if (addr > total_len) {
|
1154 |
snprintf(buf, sizeof(buf), "E00"); |
1155 |
put_packet(s, buf); |
1156 |
break;
|
1157 |
} |
1158 |
if (len > (MAX_PACKET_LENGTH - 5) / 2) |
1159 |
len = (MAX_PACKET_LENGTH - 5) / 2; |
1160 |
if (len < total_len - addr) {
|
1161 |
buf[0] = 'm'; |
1162 |
len = memtox(buf + 1, xml + addr, len);
|
1163 |
} else {
|
1164 |
buf[0] = 'l'; |
1165 |
len = memtox(buf + 1, xml + addr, total_len - addr);
|
1166 |
} |
1167 |
put_packet_binary(s, buf, len + 1);
|
1168 |
break;
|
1169 |
} |
1170 |
/* Unrecognised 'q' command. */
|
1171 |
goto unknown_command;
|
1172 |
|
1173 |
default:
|
1174 |
unknown_command:
|
1175 |
/* put empty packet */
|
1176 |
buf[0] = '\0'; |
1177 |
put_packet(s, buf); |
1178 |
break;
|
1179 |
} |
1180 |
return RS_IDLE;
|
1181 |
} |
1182 |
|
1183 |
void gdb_set_stop_cpu(CPUState *cpu)
|
1184 |
{ |
1185 |
gdbserver_state->c_cpu = cpu; |
1186 |
gdbserver_state->g_cpu = cpu; |
1187 |
} |
1188 |
|
1189 |
#ifndef CONFIG_USER_ONLY
|
1190 |
static void gdb_vm_state_change(void *opaque, int running, RunState state) |
1191 |
{ |
1192 |
GDBState *s = gdbserver_state; |
1193 |
CPUArchState *env = s->c_cpu->env_ptr; |
1194 |
CPUState *cpu = s->c_cpu; |
1195 |
char buf[256]; |
1196 |
const char *type; |
1197 |
int ret;
|
1198 |
|
1199 |
if (running || s->state == RS_INACTIVE) {
|
1200 |
return;
|
1201 |
} |
1202 |
/* Is there a GDB syscall waiting to be sent? */
|
1203 |
if (s->current_syscall_cb) {
|
1204 |
put_packet(s, s->syscall_buf); |
1205 |
return;
|
1206 |
} |
1207 |
switch (state) {
|
1208 |
case RUN_STATE_DEBUG:
|
1209 |
if (env->watchpoint_hit) {
|
1210 |
switch (env->watchpoint_hit->flags & BP_MEM_ACCESS) {
|
1211 |
case BP_MEM_READ:
|
1212 |
type = "r";
|
1213 |
break;
|
1214 |
case BP_MEM_ACCESS:
|
1215 |
type = "a";
|
1216 |
break;
|
1217 |
default:
|
1218 |
type = "";
|
1219 |
break;
|
1220 |
} |
1221 |
snprintf(buf, sizeof(buf),
|
1222 |
"T%02xthread:%02x;%swatch:" TARGET_FMT_lx ";", |
1223 |
GDB_SIGNAL_TRAP, cpu_index(cpu), type, |
1224 |
env->watchpoint_hit->vaddr); |
1225 |
env->watchpoint_hit = NULL;
|
1226 |
goto send_packet;
|
1227 |
} |
1228 |
tb_flush(env); |
1229 |
ret = GDB_SIGNAL_TRAP; |
1230 |
break;
|
1231 |
case RUN_STATE_PAUSED:
|
1232 |
ret = GDB_SIGNAL_INT; |
1233 |
break;
|
1234 |
case RUN_STATE_SHUTDOWN:
|
1235 |
ret = GDB_SIGNAL_QUIT; |
1236 |
break;
|
1237 |
case RUN_STATE_IO_ERROR:
|
1238 |
ret = GDB_SIGNAL_IO; |
1239 |
break;
|
1240 |
case RUN_STATE_WATCHDOG:
|
1241 |
ret = GDB_SIGNAL_ALRM; |
1242 |
break;
|
1243 |
case RUN_STATE_INTERNAL_ERROR:
|
1244 |
ret = GDB_SIGNAL_ABRT; |
1245 |
break;
|
1246 |
case RUN_STATE_SAVE_VM:
|
1247 |
case RUN_STATE_RESTORE_VM:
|
1248 |
return;
|
1249 |
case RUN_STATE_FINISH_MIGRATE:
|
1250 |
ret = GDB_SIGNAL_XCPU; |
1251 |
break;
|
1252 |
default:
|
1253 |
ret = GDB_SIGNAL_UNKNOWN; |
1254 |
break;
|
1255 |
} |
1256 |
snprintf(buf, sizeof(buf), "T%02xthread:%02x;", ret, cpu_index(cpu)); |
1257 |
|
1258 |
send_packet:
|
1259 |
put_packet(s, buf); |
1260 |
|
1261 |
/* disable single step if it was enabled */
|
1262 |
cpu_single_step(cpu, 0);
|
1263 |
} |
1264 |
#endif
|
1265 |
|
1266 |
/* Send a gdb syscall request.
|
1267 |
This accepts limited printf-style format specifiers, specifically:
|
1268 |
%x - target_ulong argument printed in hex.
|
1269 |
%lx - 64-bit argument printed in hex.
|
1270 |
%s - string pointer (target_ulong) and length (int) pair. */
|
1271 |
void gdb_do_syscall(gdb_syscall_complete_cb cb, const char *fmt, ...) |
1272 |
{ |
1273 |
va_list va; |
1274 |
char *p;
|
1275 |
char *p_end;
|
1276 |
target_ulong addr; |
1277 |
uint64_t i64; |
1278 |
GDBState *s; |
1279 |
|
1280 |
s = gdbserver_state; |
1281 |
if (!s)
|
1282 |
return;
|
1283 |
s->current_syscall_cb = cb; |
1284 |
#ifndef CONFIG_USER_ONLY
|
1285 |
vm_stop(RUN_STATE_DEBUG); |
1286 |
#endif
|
1287 |
va_start(va, fmt); |
1288 |
p = s->syscall_buf; |
1289 |
p_end = &s->syscall_buf[sizeof(s->syscall_buf)];
|
1290 |
*(p++) = 'F';
|
1291 |
while (*fmt) {
|
1292 |
if (*fmt == '%') { |
1293 |
fmt++; |
1294 |
switch (*fmt++) {
|
1295 |
case 'x': |
1296 |
addr = va_arg(va, target_ulong); |
1297 |
p += snprintf(p, p_end - p, TARGET_FMT_lx, addr); |
1298 |
break;
|
1299 |
case 'l': |
1300 |
if (*(fmt++) != 'x') |
1301 |
goto bad_format;
|
1302 |
i64 = va_arg(va, uint64_t); |
1303 |
p += snprintf(p, p_end - p, "%" PRIx64, i64);
|
1304 |
break;
|
1305 |
case 's': |
1306 |
addr = va_arg(va, target_ulong); |
1307 |
p += snprintf(p, p_end - p, TARGET_FMT_lx "/%x",
|
1308 |
addr, va_arg(va, int));
|
1309 |
break;
|
1310 |
default:
|
1311 |
bad_format:
|
1312 |
fprintf(stderr, "gdbstub: Bad syscall format string '%s'\n",
|
1313 |
fmt - 1);
|
1314 |
break;
|
1315 |
} |
1316 |
} else {
|
1317 |
*(p++) = *(fmt++); |
1318 |
} |
1319 |
} |
1320 |
*p = 0;
|
1321 |
va_end(va); |
1322 |
#ifdef CONFIG_USER_ONLY
|
1323 |
put_packet(s, s->syscall_buf); |
1324 |
gdb_handlesig(s->c_cpu, 0);
|
1325 |
#else
|
1326 |
/* In this case wait to send the syscall packet until notification that
|
1327 |
the CPU has stopped. This must be done because if the packet is sent
|
1328 |
now the reply from the syscall request could be received while the CPU
|
1329 |
is still in the running state, which can cause packets to be dropped
|
1330 |
and state transition 'T' packets to be sent while the syscall is still
|
1331 |
being processed. */
|
1332 |
cpu_exit(s->c_cpu); |
1333 |
#endif
|
1334 |
} |
1335 |
|
1336 |
static void gdb_read_byte(GDBState *s, int ch) |
1337 |
{ |
1338 |
int i, csum;
|
1339 |
uint8_t reply; |
1340 |
|
1341 |
#ifndef CONFIG_USER_ONLY
|
1342 |
if (s->last_packet_len) {
|
1343 |
/* Waiting for a response to the last packet. If we see the start
|
1344 |
of a new command then abandon the previous response. */
|
1345 |
if (ch == '-') { |
1346 |
#ifdef DEBUG_GDB
|
1347 |
printf("Got NACK, retransmitting\n");
|
1348 |
#endif
|
1349 |
put_buffer(s, (uint8_t *)s->last_packet, s->last_packet_len); |
1350 |
} |
1351 |
#ifdef DEBUG_GDB
|
1352 |
else if (ch == '+') |
1353 |
printf("Got ACK\n");
|
1354 |
else
|
1355 |
printf("Got '%c' when expecting ACK/NACK\n", ch);
|
1356 |
#endif
|
1357 |
if (ch == '+' || ch == '$') |
1358 |
s->last_packet_len = 0;
|
1359 |
if (ch != '$') |
1360 |
return;
|
1361 |
} |
1362 |
if (runstate_is_running()) {
|
1363 |
/* when the CPU is running, we cannot do anything except stop
|
1364 |
it when receiving a char */
|
1365 |
vm_stop(RUN_STATE_PAUSED); |
1366 |
} else
|
1367 |
#endif
|
1368 |
{ |
1369 |
switch(s->state) {
|
1370 |
case RS_IDLE:
|
1371 |
if (ch == '$') { |
1372 |
s->line_buf_index = 0;
|
1373 |
s->state = RS_GETLINE; |
1374 |
} |
1375 |
break;
|
1376 |
case RS_GETLINE:
|
1377 |
if (ch == '#') { |
1378 |
s->state = RS_CHKSUM1; |
1379 |
} else if (s->line_buf_index >= sizeof(s->line_buf) - 1) { |
1380 |
s->state = RS_IDLE; |
1381 |
} else {
|
1382 |
s->line_buf[s->line_buf_index++] = ch; |
1383 |
} |
1384 |
break;
|
1385 |
case RS_CHKSUM1:
|
1386 |
s->line_buf[s->line_buf_index] = '\0';
|
1387 |
s->line_csum = fromhex(ch) << 4;
|
1388 |
s->state = RS_CHKSUM2; |
1389 |
break;
|
1390 |
case RS_CHKSUM2:
|
1391 |
s->line_csum |= fromhex(ch); |
1392 |
csum = 0;
|
1393 |
for(i = 0; i < s->line_buf_index; i++) { |
1394 |
csum += s->line_buf[i]; |
1395 |
} |
1396 |
if (s->line_csum != (csum & 0xff)) { |
1397 |
reply = '-';
|
1398 |
put_buffer(s, &reply, 1);
|
1399 |
s->state = RS_IDLE; |
1400 |
} else {
|
1401 |
reply = '+';
|
1402 |
put_buffer(s, &reply, 1);
|
1403 |
s->state = gdb_handle_packet(s, s->line_buf); |
1404 |
} |
1405 |
break;
|
1406 |
default:
|
1407 |
abort(); |
1408 |
} |
1409 |
} |
1410 |
} |
1411 |
|
1412 |
/* Tell the remote gdb that the process has exited. */
|
1413 |
void gdb_exit(CPUArchState *env, int code) |
1414 |
{ |
1415 |
GDBState *s; |
1416 |
char buf[4]; |
1417 |
|
1418 |
s = gdbserver_state; |
1419 |
if (!s) {
|
1420 |
return;
|
1421 |
} |
1422 |
#ifdef CONFIG_USER_ONLY
|
1423 |
if (gdbserver_fd < 0 || s->fd < 0) { |
1424 |
return;
|
1425 |
} |
1426 |
#endif
|
1427 |
|
1428 |
snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code); |
1429 |
put_packet(s, buf); |
1430 |
|
1431 |
#ifndef CONFIG_USER_ONLY
|
1432 |
if (s->chr) {
|
1433 |
qemu_chr_delete(s->chr); |
1434 |
} |
1435 |
#endif
|
1436 |
} |
1437 |
|
1438 |
#ifdef CONFIG_USER_ONLY
|
1439 |
int
|
1440 |
gdb_queuesig (void)
|
1441 |
{ |
1442 |
GDBState *s; |
1443 |
|
1444 |
s = gdbserver_state; |
1445 |
|
1446 |
if (gdbserver_fd < 0 || s->fd < 0) |
1447 |
return 0; |
1448 |
else
|
1449 |
return 1; |
1450 |
} |
1451 |
|
1452 |
int
|
1453 |
gdb_handlesig(CPUState *cpu, int sig)
|
1454 |
{ |
1455 |
CPUArchState *env = cpu->env_ptr; |
1456 |
GDBState *s; |
1457 |
char buf[256]; |
1458 |
int n;
|
1459 |
|
1460 |
s = gdbserver_state; |
1461 |
if (gdbserver_fd < 0 || s->fd < 0) { |
1462 |
return sig;
|
1463 |
} |
1464 |
|
1465 |
/* disable single step if it was enabled */
|
1466 |
cpu_single_step(cpu, 0);
|
1467 |
tb_flush(env); |
1468 |
|
1469 |
if (sig != 0) { |
1470 |
snprintf(buf, sizeof(buf), "S%02x", target_signal_to_gdb(sig)); |
1471 |
put_packet(s, buf); |
1472 |
} |
1473 |
/* put_packet() might have detected that the peer terminated the
|
1474 |
connection. */
|
1475 |
if (s->fd < 0) { |
1476 |
return sig;
|
1477 |
} |
1478 |
|
1479 |
sig = 0;
|
1480 |
s->state = RS_IDLE; |
1481 |
s->running_state = 0;
|
1482 |
while (s->running_state == 0) { |
1483 |
n = read(s->fd, buf, 256);
|
1484 |
if (n > 0) { |
1485 |
int i;
|
1486 |
|
1487 |
for (i = 0; i < n; i++) { |
1488 |
gdb_read_byte(s, buf[i]); |
1489 |
} |
1490 |
} else if (n == 0 || errno != EAGAIN) { |
1491 |
/* XXX: Connection closed. Should probably wait for another
|
1492 |
connection before continuing. */
|
1493 |
return sig;
|
1494 |
} |
1495 |
} |
1496 |
sig = s->signal; |
1497 |
s->signal = 0;
|
1498 |
return sig;
|
1499 |
} |
1500 |
|
1501 |
/* Tell the remote gdb that the process has exited due to SIG. */
|
1502 |
void gdb_signalled(CPUArchState *env, int sig) |
1503 |
{ |
1504 |
GDBState *s; |
1505 |
char buf[4]; |
1506 |
|
1507 |
s = gdbserver_state; |
1508 |
if (gdbserver_fd < 0 || s->fd < 0) { |
1509 |
return;
|
1510 |
} |
1511 |
|
1512 |
snprintf(buf, sizeof(buf), "X%02x", target_signal_to_gdb(sig)); |
1513 |
put_packet(s, buf); |
1514 |
} |
1515 |
|
1516 |
static void gdb_accept(void) |
1517 |
{ |
1518 |
GDBState *s; |
1519 |
struct sockaddr_in sockaddr;
|
1520 |
socklen_t len; |
1521 |
int fd;
|
1522 |
|
1523 |
for(;;) {
|
1524 |
len = sizeof(sockaddr);
|
1525 |
fd = accept(gdbserver_fd, (struct sockaddr *)&sockaddr, &len);
|
1526 |
if (fd < 0 && errno != EINTR) { |
1527 |
perror("accept");
|
1528 |
return;
|
1529 |
} else if (fd >= 0) { |
1530 |
#ifndef _WIN32
|
1531 |
fcntl(fd, F_SETFD, FD_CLOEXEC); |
1532 |
#endif
|
1533 |
break;
|
1534 |
} |
1535 |
} |
1536 |
|
1537 |
/* set short latency */
|
1538 |
socket_set_nodelay(fd); |
1539 |
|
1540 |
s = g_malloc0(sizeof(GDBState));
|
1541 |
s->c_cpu = first_cpu; |
1542 |
s->g_cpu = first_cpu; |
1543 |
s->fd = fd; |
1544 |
gdb_has_xml = false;
|
1545 |
|
1546 |
gdbserver_state = s; |
1547 |
|
1548 |
fcntl(fd, F_SETFL, O_NONBLOCK); |
1549 |
} |
1550 |
|
1551 |
static int gdbserver_open(int port) |
1552 |
{ |
1553 |
struct sockaddr_in sockaddr;
|
1554 |
int fd, val, ret;
|
1555 |
|
1556 |
fd = socket(PF_INET, SOCK_STREAM, 0);
|
1557 |
if (fd < 0) { |
1558 |
perror("socket");
|
1559 |
return -1; |
1560 |
} |
1561 |
#ifndef _WIN32
|
1562 |
fcntl(fd, F_SETFD, FD_CLOEXEC); |
1563 |
#endif
|
1564 |
|
1565 |
/* allow fast reuse */
|
1566 |
val = 1;
|
1567 |
qemu_setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
|
1568 |
|
1569 |
sockaddr.sin_family = AF_INET; |
1570 |
sockaddr.sin_port = htons(port); |
1571 |
sockaddr.sin_addr.s_addr = 0;
|
1572 |
ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); |
1573 |
if (ret < 0) { |
1574 |
perror("bind");
|
1575 |
close(fd); |
1576 |
return -1; |
1577 |
} |
1578 |
ret = listen(fd, 0);
|
1579 |
if (ret < 0) { |
1580 |
perror("listen");
|
1581 |
close(fd); |
1582 |
return -1; |
1583 |
} |
1584 |
return fd;
|
1585 |
} |
1586 |
|
1587 |
int gdbserver_start(int port) |
1588 |
{ |
1589 |
gdbserver_fd = gdbserver_open(port); |
1590 |
if (gdbserver_fd < 0) |
1591 |
return -1; |
1592 |
/* accept connections */
|
1593 |
gdb_accept(); |
1594 |
return 0; |
1595 |
} |
1596 |
|
1597 |
/* Disable gdb stub for child processes. */
|
1598 |
void gdbserver_fork(CPUArchState *env)
|
1599 |
{ |
1600 |
GDBState *s = gdbserver_state; |
1601 |
if (gdbserver_fd < 0 || s->fd < 0) |
1602 |
return;
|
1603 |
close(s->fd); |
1604 |
s->fd = -1;
|
1605 |
cpu_breakpoint_remove_all(env, BP_GDB); |
1606 |
cpu_watchpoint_remove_all(env, BP_GDB); |
1607 |
} |
1608 |
#else
|
1609 |
static int gdb_chr_can_receive(void *opaque) |
1610 |
{ |
1611 |
/* We can handle an arbitrarily large amount of data.
|
1612 |
Pick the maximum packet size, which is as good as anything. */
|
1613 |
return MAX_PACKET_LENGTH;
|
1614 |
} |
1615 |
|
1616 |
static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size) |
1617 |
{ |
1618 |
int i;
|
1619 |
|
1620 |
for (i = 0; i < size; i++) { |
1621 |
gdb_read_byte(gdbserver_state, buf[i]); |
1622 |
} |
1623 |
} |
1624 |
|
1625 |
static void gdb_chr_event(void *opaque, int event) |
1626 |
{ |
1627 |
switch (event) {
|
1628 |
case CHR_EVENT_OPENED:
|
1629 |
vm_stop(RUN_STATE_PAUSED); |
1630 |
gdb_has_xml = false;
|
1631 |
break;
|
1632 |
default:
|
1633 |
break;
|
1634 |
} |
1635 |
} |
1636 |
|
1637 |
static void gdb_monitor_output(GDBState *s, const char *msg, int len) |
1638 |
{ |
1639 |
char buf[MAX_PACKET_LENGTH];
|
1640 |
|
1641 |
buf[0] = 'O'; |
1642 |
if (len > (MAX_PACKET_LENGTH/2) - 1) |
1643 |
len = (MAX_PACKET_LENGTH/2) - 1; |
1644 |
memtohex(buf + 1, (uint8_t *)msg, len);
|
1645 |
put_packet(s, buf); |
1646 |
} |
1647 |
|
1648 |
static int gdb_monitor_write(CharDriverState *chr, const uint8_t *buf, int len) |
1649 |
{ |
1650 |
const char *p = (const char *)buf; |
1651 |
int max_sz;
|
1652 |
|
1653 |
max_sz = (sizeof(gdbserver_state->last_packet) - 2) / 2; |
1654 |
for (;;) {
|
1655 |
if (len <= max_sz) {
|
1656 |
gdb_monitor_output(gdbserver_state, p, len); |
1657 |
break;
|
1658 |
} |
1659 |
gdb_monitor_output(gdbserver_state, p, max_sz); |
1660 |
p += max_sz; |
1661 |
len -= max_sz; |
1662 |
} |
1663 |
return len;
|
1664 |
} |
1665 |
|
1666 |
#ifndef _WIN32
|
1667 |
static void gdb_sigterm_handler(int signal) |
1668 |
{ |
1669 |
if (runstate_is_running()) {
|
1670 |
vm_stop(RUN_STATE_PAUSED); |
1671 |
} |
1672 |
} |
1673 |
#endif
|
1674 |
|
1675 |
int gdbserver_start(const char *device) |
1676 |
{ |
1677 |
GDBState *s; |
1678 |
char gdbstub_device_name[128]; |
1679 |
CharDriverState *chr = NULL;
|
1680 |
CharDriverState *mon_chr; |
1681 |
|
1682 |
if (!device)
|
1683 |
return -1; |
1684 |
if (strcmp(device, "none") != 0) { |
1685 |
if (strstart(device, "tcp:", NULL)) { |
1686 |
/* enforce required TCP attributes */
|
1687 |
snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
|
1688 |
"%s,nowait,nodelay,server", device);
|
1689 |
device = gdbstub_device_name; |
1690 |
} |
1691 |
#ifndef _WIN32
|
1692 |
else if (strcmp(device, "stdio") == 0) { |
1693 |
struct sigaction act;
|
1694 |
|
1695 |
memset(&act, 0, sizeof(act)); |
1696 |
act.sa_handler = gdb_sigterm_handler; |
1697 |
sigaction(SIGINT, &act, NULL);
|
1698 |
} |
1699 |
#endif
|
1700 |
chr = qemu_chr_new("gdb", device, NULL); |
1701 |
if (!chr)
|
1702 |
return -1; |
1703 |
|
1704 |
qemu_chr_fe_claim_no_fail(chr); |
1705 |
qemu_chr_add_handlers(chr, gdb_chr_can_receive, gdb_chr_receive, |
1706 |
gdb_chr_event, NULL);
|
1707 |
} |
1708 |
|
1709 |
s = gdbserver_state; |
1710 |
if (!s) {
|
1711 |
s = g_malloc0(sizeof(GDBState));
|
1712 |
gdbserver_state = s; |
1713 |
|
1714 |
qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
|
1715 |
|
1716 |
/* Initialize a monitor terminal for gdb */
|
1717 |
mon_chr = g_malloc0(sizeof(*mon_chr));
|
1718 |
mon_chr->chr_write = gdb_monitor_write; |
1719 |
monitor_init(mon_chr, 0);
|
1720 |
} else {
|
1721 |
if (s->chr)
|
1722 |
qemu_chr_delete(s->chr); |
1723 |
mon_chr = s->mon_chr; |
1724 |
memset(s, 0, sizeof(GDBState)); |
1725 |
} |
1726 |
s->c_cpu = first_cpu; |
1727 |
s->g_cpu = first_cpu; |
1728 |
s->chr = chr; |
1729 |
s->state = chr ? RS_IDLE : RS_INACTIVE; |
1730 |
s->mon_chr = mon_chr; |
1731 |
s->current_syscall_cb = NULL;
|
1732 |
|
1733 |
return 0; |
1734 |
} |
1735 |
#endif
|