6085d6f695
In multi-arch debugging, if GDB sends Z0 packet, GDBserver should be able to do several things below: - choose the right breakpoint instruction to insert according to the information available, such as 'kind' in Z0 packet and address, - choose the right breakpoint instruction to check memory writes and validate inserted memory breakpoint - be aware of different breakpoint instructions in $ARCH_breakpoint_at. unfortunately GDBserver can't do them now. Although x86 GDBserver supports multi-arch, it doesn't need to support them above because breakpoint instruction on i686 and x86_64 is the same. However, breakpoint instructions on aarch64 and arm (arm mode, thumb1, and thumb2) are different. I tried to teach aarch64 GDBserver backend to be really multi-arch-capable in the following ways, - linux_low_target return the right breakpoint instruction according to the 'kind' in Z0 packet, and insert_memory_breakpoint can do the right thing. - once breakpoint is inserted, the breakpoint data and length is recorded in each breakpoint object, so that validate_breakpoint and check_mem_write can get the right breakpoint instruction from each breakpoint object, rather than from global variable breakpoint_data. - linux_low_target needs another hook function for pc increment after hitting a breakpoint. - let set_breakpoint_at, which is widely used for tracepoint, use the 'default' breakpoint instruction. We can always use aarch64 breakpoint instruction since arm doesn't support tracepoint yet. looks it is not a small piece of work, so I decide to disable Z0 packet on multi-arch, which means aarch64 GDBserver only supports Z0 packet if it is started to debug only one process (extended protocol is not used) and process target description is 64-bit. gdb/gdbserver: 2015-08-04 Yao Qi <yao.qi@linaro.org> * linux-aarch64-low.c (aarch64_supports_z_point_type): Return 0 for Z_PACKET_SW_BP if it may be used in multi-arch debugging. * server.c (extended_protocol): Remove "static". * server.h (extended_protocol): Declare it.
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
/* Common definitions for remote server for GDB.
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Copyright (C) 1993-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef SERVER_H
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#define SERVER_H
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#include "common-defs.h"
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gdb_static_assert (sizeof (CORE_ADDR) >= sizeof (void *));
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#ifdef __MINGW32CE__
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#include "wincecompat.h"
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#endif
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#include "version.h"
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#if !HAVE_DECL_STRERROR
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#ifndef strerror
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extern char *strerror (int); /* X3.159-1989 4.11.6.2 */
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#endif
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#endif
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#if !HAVE_DECL_PERROR
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#ifndef perror
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extern void perror (const char *);
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#endif
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#endif
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#if !HAVE_DECL_VASPRINTF
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extern int vasprintf(char **strp, const char *fmt, va_list ap);
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#endif
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#if !HAVE_DECL_VSNPRINTF
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int vsnprintf(char *str, size_t size, const char *format, va_list ap);
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#endif
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#ifdef IN_PROCESS_AGENT
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# define PROG "ipa"
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#else
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# define PROG "gdbserver"
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#endif
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#include "buffer.h"
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#include "xml-utils.h"
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#include "regcache.h"
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#include "gdb_signals.h"
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#include "target.h"
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#include "mem-break.h"
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#include "gdbthread.h"
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#include "inferiors.h"
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/* Target-specific functions */
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void initialize_low ();
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/* Public variables in server.c */
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extern ptid_t cont_thread;
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extern ptid_t general_thread;
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extern int server_waiting;
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extern int pass_signals[];
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extern int program_signals[];
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extern int program_signals_p;
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extern int disable_packet_vCont;
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extern int disable_packet_Tthread;
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extern int disable_packet_qC;
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extern int disable_packet_qfThreadInfo;
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extern int run_once;
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extern int multi_process;
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extern int report_fork_events;
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extern int report_vfork_events;
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extern int non_stop;
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extern int extended_protocol;
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/* True if the "swbreak+" feature is active. In that case, GDB wants
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us to report whether a trap is explained by a software breakpoint
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and for the server to handle PC adjustment if necessary on this
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target. Only enabled if the target supports it. */
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extern int swbreak_feature;
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/* True if the "hwbreak+" feature is active. In that case, GDB wants
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us to report whether a trap is explained by a hardware breakpoint.
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Only enabled if the target supports it. */
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extern int hwbreak_feature;
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extern int disable_randomization;
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#if USE_WIN32API
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#include <winsock2.h>
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typedef SOCKET gdb_fildes_t;
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#else
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typedef int gdb_fildes_t;
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#endif
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#include "event-loop.h"
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/* Functions from server.c. */
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extern int handle_serial_event (int err, gdb_client_data client_data);
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extern int handle_target_event (int err, gdb_client_data client_data);
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#include "remote-utils.h"
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#include "utils.h"
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#include "debug.h"
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/* Maximum number of bytes to read/write at once. The value here
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is chosen to fill up a packet (the headers account for the 32). */
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#define MAXBUFBYTES(N) (((N)-32)/2)
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/* Buffer sizes for transferring memory, registers, etc. Set to a constant
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value to accomodate multiple register formats. This value must be at least
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as large as the largest register set supported by gdbserver. */
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#define PBUFSIZ 16384
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#endif /* SERVER_H */
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