mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-05 10:57:57 +00:00
4cc1b3f79d
match stubs and protocol spec. * gdbserver/remote-utils.c (remote_open): Cast to struct sockaddr when passing to function which expects that. The following changes aren't quite enough to make things work with LynxOS (apprently kernel problems). * infrun.c (wait_for_inferior): When resuming new thread, pass pid not -1 for remote case. * thread.c (info_threads_command): Give error if !target_has_stack. * infrun.c (start_remote): Call init_thread_list. * thread.c (info_threads_command): Don't call kill for remote debugging target. * target.c (normal_pid_to_str): Print "thread" not "process" for remote. * remote.c, gdbserver/*: Add 'H', 'S', and 'C' requests, 'X' response, and `thread' part of 'T' response. * gdbserver/*: If program exits, send packet to GDB before exiting. Handle termination with a signal the same as exiting with an exitstatus. * remote.c: Don't try to kill program after getting an 'X' response. * infrun.c (wait_for_inferior): Add comment about kill versus mourn.
1635 lines
41 KiB
C
1635 lines
41 KiB
C
/* Remote target communications for serial-line targets in custom GDB protocol
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Copyright 1988, 1991, 1992, 1993, 1994 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 2 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, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Remote communication protocol.
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A debug packet whose contents are <data>
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is encapsulated for transmission in the form:
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$ <data> # CSUM1 CSUM2
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<data> must be ASCII alphanumeric and cannot include characters
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'$' or '#'. If <data> starts with two characters followed by
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':', then the existing stubs interpret this as a sequence number.
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CSUM1 and CSUM2 are ascii hex representation of an 8-bit
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checksum of <data>, the most significant nibble is sent first.
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the hex digits 0-9,a-f are used.
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Receiver responds with:
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+ - if CSUM is correct and ready for next packet
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- - if CSUM is incorrect
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<data> is as follows:
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Most values are encoded in ascii hex digits. Signal numbers are according
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to the numbering in target.h.
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Request Packet
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set thread Hct... Set thread for subsequent operations.
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c = 'c' for thread used in step and
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continue; t... can be -1 for all
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threads.
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c = 'g' for thread used in other
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operations. If zero, pick a thread,
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any thread.
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reply OK for success
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ENN for an error.
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read registers g
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reply XX....X Each byte of register data
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is described by two hex digits.
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Registers are in the internal order
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for GDB, and the bytes in a register
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are in the same order the machine uses.
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or ENN for an error.
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write regs GXX..XX Each byte of register data
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is described by two hex digits.
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reply OK for success
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ENN for an error
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write reg Pn...=r... Write register n... with value r...,
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which contains two hex digits for each
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byte in the register (target byte
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order).
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reply OK for success
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ENN for an error
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(not supported by all stubs).
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read mem mAA..AA,LLLL AA..AA is address, LLLL is length.
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reply XX..XX XX..XX is mem contents
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Can be fewer bytes than requested
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if able to read only part of the data.
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or ENN NN is errno
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write mem MAA..AA,LLLL:XX..XX
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AA..AA is address,
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LLLL is number of bytes,
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XX..XX is data
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reply OK for success
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ENN for an error (this includes the case
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where only part of the data was
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written).
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continue cAA..AA AA..AA is address to resume
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If AA..AA is omitted,
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resume at same address.
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step sAA..AA AA..AA is address to resume
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If AA..AA is omitted,
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resume at same address.
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continue with Csig;AA Continue with signal sig (hex signal
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signal number).
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step with Ssig;AA Like 'C' but step not continue.
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signal
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last signal ? Reply the current reason for stopping.
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This is the same reply as is generated
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for step or cont : SAA where AA is the
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signal number.
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There is no immediate reply to step or cont.
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The reply comes when the machine stops.
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It is SAA AA is the signal number.
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or... TAAn...:r...;n...:r...;n...:r...;
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AA = signal number
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n... = register number (hex)
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r... = register contents
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n... = `thread'
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r... = thread process ID. This is
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a hex integer.
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n... = other string not starting
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with valid hex digit.
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gdb should ignore this n,r pair
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and go on to the next. This way
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we can extend the protocol.
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or... WAA The process exited, and AA is
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the exit status. This is only
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applicable for certains sorts of
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targets.
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or... XAA The process terminated with signal
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AA.
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or... Otext Send text to stdout. This can happen
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at any time while the program is
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running and the debugger should
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continue to wait for 'W', 'T', etc.
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kill request k
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toggle debug d toggle debug flag (see 386 & 68k stubs)
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reset r reset -- see sparc stub.
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reserved <other> On other requests, the stub should
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ignore the request and send an empty
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response ($#<checksum>). This way
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we can extend the protocol and GDB
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can tell whether the stub it is
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talking to uses the old or the new.
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search tAA:PP,MM Search backwards starting at address
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AA for a match with pattern PP and
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mask MM. PP and MM are 4 bytes.
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Not supported by all stubs.
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general query qXXXX Request info about XXXX.
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general set QXXXX=yyyy Set value of XXXX to yyyy.
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query sect offs qOffsets Get section offsets. Reply is
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Text=xxx;Data=yyy;Bss=zzz
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Responses can be run-length encoded to save space. A '*' means that
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the next character is an ASCII encoding giving a repeat count which
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stands for that many repititions of the character preceding the '*'.
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The encoding is n+29, yielding a printable character where n >=3
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(which is where rle starts to win). Don't use an n > 126.
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So
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"0* " means the same as "0000". */
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#include "defs.h"
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#include <string.h>
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#include <fcntl.h>
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#include "frame.h"
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#include "inferior.h"
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#include "bfd.h"
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#include "symfile.h"
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#include "target.h"
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#include "wait.h"
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#include "terminal.h"
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#include "gdbcmd.h"
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#include "objfiles.h"
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#include "gdb-stabs.h"
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#include "dcache.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <signal.h>
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#include "serial.h"
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/* Prototypes for local functions */
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static int
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remote_write_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len));
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static int
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remote_read_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len));
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static void
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remote_files_info PARAMS ((struct target_ops *ignore));
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static int
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remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len,
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int should_write, struct target_ops *target));
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static void
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remote_prepare_to_store PARAMS ((void));
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static void
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remote_fetch_registers PARAMS ((int regno));
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static void
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remote_resume PARAMS ((int pid, int step, enum target_signal siggnal));
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static int
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remote_start_remote PARAMS ((char *dummy));
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static void
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remote_open PARAMS ((char *name, int from_tty));
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static void
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remote_close PARAMS ((int quitting));
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static void
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remote_store_registers PARAMS ((int regno));
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static void
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getpkt PARAMS ((char *buf, int forever));
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static int
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putpkt PARAMS ((char *buf));
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static void
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remote_send PARAMS ((char *buf));
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static int
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readchar PARAMS ((int timeout));
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static int remote_wait PARAMS ((int pid, struct target_waitstatus *status));
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static int
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tohex PARAMS ((int nib));
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static int
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fromhex PARAMS ((int a));
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static void
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remote_detach PARAMS ((char *args, int from_tty));
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static void
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remote_interrupt PARAMS ((int signo));
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static void
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remote_interrupt_twice PARAMS ((int signo));
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static void
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interrupt_query PARAMS ((void));
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extern struct target_ops remote_ops; /* Forward decl */
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/* This was 5 seconds, which is a long time to sit and wait.
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Unless this is going though some terminal server or multiplexer or
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other form of hairy serial connection, I would think 2 seconds would
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be plenty. */
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static int remote_timeout = 2;
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#if 0
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int icache;
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#endif
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/* Descriptor for I/O to remote machine. Initialize it to NULL so that
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remote_open knows that we don't have a file open when the program
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starts. */
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serial_t remote_desc = NULL;
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/* Having this larger than 400 causes us to be incompatible with m68k-stub.c
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and i386-stub.c. Normally, no one would notice because it only matters
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for writing large chunks of memory (e.g. in downloads). Also, this needs
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to be more than 400 if required to hold the registers (see below, where
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we round it up based on REGISTER_BYTES). */
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#define PBUFSIZ 400
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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 ((PBUFSIZ-32)/2)
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/* Round up PBUFSIZ to hold all the registers, at least. */
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/* The blank line after the #if seems to be required to work around a
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bug in HP's PA compiler. */
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#if REGISTER_BYTES > MAXBUFBYTES
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#undef PBUFSIZ
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#define PBUFSIZ (REGISTER_BYTES * 2 + 32)
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#endif
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/* Should we try the 'P' request? If this is set to one when the stub
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doesn't support 'P', the only consequence is some unnecessary traffic. */
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static int stub_supports_P = 1;
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/* These are the threads which we last sent to the remote system. -1 for all
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or -2 for not sent yet. */
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int general_thread;
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int cont_thread;
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static void
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set_thread (th, gen)
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int th;
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int gen;
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{
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char buf[PBUFSIZ];
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int state = gen ? general_thread : cont_thread;
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if (state == th)
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return;
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buf[0] = 'H';
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buf[1] = gen ? 'g' : 'c';
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if (th == 42000)
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{
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buf[2] = '0';
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buf[3] = '\0';
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}
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else if (th < 0)
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sprintf (&buf[2], "-%x", -th);
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else
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sprintf (&buf[2], "%x", th);
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putpkt (buf);
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getpkt (buf, 0);
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if (gen)
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general_thread = th;
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else
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cont_thread = th;
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}
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/* Clean up connection to a remote debugger. */
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/* ARGSUSED */
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static void
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remote_close (quitting)
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int quitting;
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{
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if (remote_desc)
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SERIAL_CLOSE (remote_desc);
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remote_desc = NULL;
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}
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/* Query the remote side for the text, data and bss offsets. */
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static void
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get_offsets ()
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{
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char buf[PBUFSIZ];
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int nvals;
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CORE_ADDR text_addr, data_addr, bss_addr;
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struct section_offsets *offs;
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putpkt ("qOffsets");
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getpkt (buf, 0);
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if (buf[0] == '\000')
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return; /* Return silently. Stub doesn't support this
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command. */
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if (buf[0] == 'E')
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{
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warning ("Remote failure reply: %s", buf);
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return;
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}
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nvals = sscanf (buf, "Text=%lx;Data=%lx;Bss=%lx", &text_addr, &data_addr,
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&bss_addr);
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if (nvals != 3)
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error ("Malformed response to offset query, %s", buf);
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if (symfile_objfile == NULL)
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return;
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offs = (struct section_offsets *) alloca (sizeof (struct section_offsets)
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+ symfile_objfile->num_sections
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* sizeof (offs->offsets));
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memcpy (offs, symfile_objfile->section_offsets,
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sizeof (struct section_offsets)
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+ symfile_objfile->num_sections
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* sizeof (offs->offsets));
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/* FIXME: This code assumes gdb-stabs.h is being used; it's broken
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for xcoff, dwarf, sdb-coff, etc. But there is no simple
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canonical representation for this stuff. (Just what does "text"
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as seen by the stub mean, anyway? I think it means all sections
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with SEC_CODE set, but we currently have no way to deal with that). */
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ANOFFSET (offs, SECT_OFF_TEXT) = text_addr;
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/* This is a temporary kludge to force data and bss to use the same offsets
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because that's what nlmconv does now. The real solution requires changes
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to the stub and remote.c that I don't have time to do right now. */
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ANOFFSET (offs, SECT_OFF_DATA) = data_addr;
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ANOFFSET (offs, SECT_OFF_BSS) = data_addr;
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objfile_relocate (symfile_objfile, offs);
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}
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/* Stub for catch_errors. */
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static int
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remote_start_remote (dummy)
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char *dummy;
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{
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immediate_quit = 1; /* Allow user to interrupt it */
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/* Ack any packet which the remote side has already sent. */
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SERIAL_WRITE (remote_desc, "+", 1);
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/* Let the stub know that we want it to return the thread. */
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set_thread (-1, 0);
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get_offsets (); /* Get text, data & bss offsets */
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putpkt ("?"); /* initiate a query from remote machine */
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immediate_quit = 0;
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start_remote (); /* Initialize gdb process mechanisms */
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return 1;
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}
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||
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/* Open a connection to a remote debugger.
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NAME is the filename used for communication. */
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||
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static DCACHE *remote_dcache;
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||
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static void
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remote_open (name, from_tty)
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char *name;
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int from_tty;
|
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{
|
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if (name == 0)
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error (
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"To open a remote debug connection, you need to specify what serial\n\
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device is attached to the remote system (e.g. /dev/ttya).");
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||
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target_preopen (from_tty);
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||
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unpush_target (&remote_ops);
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||
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||
remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes);
|
||
|
||
remote_desc = SERIAL_OPEN (name);
|
||
if (!remote_desc)
|
||
perror_with_name (name);
|
||
|
||
if (baud_rate != -1)
|
||
{
|
||
if (SERIAL_SETBAUDRATE (remote_desc, baud_rate))
|
||
{
|
||
SERIAL_CLOSE (remote_desc);
|
||
perror_with_name (name);
|
||
}
|
||
}
|
||
|
||
SERIAL_RAW (remote_desc);
|
||
|
||
/* If there is something sitting in the buffer we might take it as a
|
||
response to a command, which would be bad. */
|
||
SERIAL_FLUSH_INPUT (remote_desc);
|
||
|
||
if (from_tty)
|
||
{
|
||
puts_filtered ("Remote debugging using ");
|
||
puts_filtered (name);
|
||
puts_filtered ("\n");
|
||
}
|
||
push_target (&remote_ops); /* Switch to using remote target now */
|
||
|
||
/* Start out by trying the 'P' request to set registers. We set this each
|
||
time that we open a new target so that if the user switches from one
|
||
stub to another, we can (if the target is closed and reopened) cope. */
|
||
stub_supports_P = 1;
|
||
|
||
general_thread = -2;
|
||
cont_thread = -2;
|
||
|
||
/* Without this, some commands which require an active target (such as kill)
|
||
won't work. This variable serves (at least) double duty as both the pid
|
||
of the target process (if it has such), and as a flag indicating that a
|
||
target is active. These functions should be split out into seperate
|
||
variables, especially since GDB will someday have a notion of debugging
|
||
several processes. */
|
||
|
||
inferior_pid = 42000;
|
||
|
||
/* Start the remote connection; if error (0), discard this target.
|
||
In particular, if the user quits, be sure to discard it
|
||
(we'd be in an inconsistent state otherwise). */
|
||
if (!catch_errors (remote_start_remote, (char *)0,
|
||
"Couldn't establish connection to remote target\n", RETURN_MASK_ALL))
|
||
pop_target();
|
||
}
|
||
|
||
/* remote_detach()
|
||
takes a program previously attached to and detaches it.
|
||
We better not have left any breakpoints
|
||
in the program or it'll die when it hits one.
|
||
Close the open connection to the remote debugger.
|
||
Use this when you want to detach and do something else
|
||
with your gdb. */
|
||
|
||
static void
|
||
remote_detach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
if (args)
|
||
error ("Argument given to \"detach\" when remotely debugging.");
|
||
|
||
pop_target ();
|
||
if (from_tty)
|
||
puts_filtered ("Ending remote debugging.\n");
|
||
}
|
||
|
||
/* Convert hex digit A to a number. */
|
||
|
||
static int
|
||
fromhex (a)
|
||
int a;
|
||
{
|
||
if (a >= '0' && a <= '9')
|
||
return a - '0';
|
||
else if (a >= 'a' && a <= 'f')
|
||
return a - 'a' + 10;
|
||
else
|
||
error ("Reply contains invalid hex digit %d", a);
|
||
}
|
||
|
||
/* Convert number NIB to a hex digit. */
|
||
|
||
static int
|
||
tohex (nib)
|
||
int nib;
|
||
{
|
||
if (nib < 10)
|
||
return '0'+nib;
|
||
else
|
||
return 'a'+nib-10;
|
||
}
|
||
|
||
/* Tell the remote machine to resume. */
|
||
|
||
static enum target_signal last_sent_signal = TARGET_SIGNAL_0;
|
||
int last_sent_step;
|
||
|
||
static void
|
||
remote_resume (pid, step, siggnal)
|
||
int pid, step;
|
||
enum target_signal siggnal;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
|
||
if (pid == -1)
|
||
set_thread (inferior_pid, 0);
|
||
else
|
||
set_thread (pid, 0);
|
||
|
||
dcache_flush (remote_dcache);
|
||
|
||
last_sent_signal = siggnal;
|
||
last_sent_step = step;
|
||
|
||
if (siggnal != TARGET_SIGNAL_0)
|
||
{
|
||
buf[0] = step ? 'S' : 'C';
|
||
buf[1] = tohex (((int)siggnal >> 4) & 0xf);
|
||
buf[2] = tohex ((int)siggnal & 0xf);
|
||
buf[3] = '\0';
|
||
}
|
||
else
|
||
strcpy (buf, step ? "s": "c");
|
||
|
||
putpkt (buf);
|
||
}
|
||
|
||
/* Send ^C to target to halt it. Target will respond, and send us a
|
||
packet. */
|
||
|
||
static void
|
||
remote_interrupt (signo)
|
||
int signo;
|
||
{
|
||
/* If this doesn't work, try more severe steps. */
|
||
signal (signo, remote_interrupt_twice);
|
||
|
||
if (remote_debug)
|
||
printf_unfiltered ("remote_interrupt called\n");
|
||
|
||
SERIAL_WRITE (remote_desc, "\003", 1); /* Send a ^C */
|
||
}
|
||
|
||
static void (*ofunc)();
|
||
|
||
/* The user typed ^C twice. */
|
||
static void
|
||
remote_interrupt_twice (signo)
|
||
int signo;
|
||
{
|
||
signal (signo, ofunc);
|
||
|
||
interrupt_query ();
|
||
|
||
signal (signo, remote_interrupt);
|
||
}
|
||
|
||
/* Ask the user what to do when an interrupt is received. */
|
||
|
||
static void
|
||
interrupt_query ()
|
||
{
|
||
target_terminal_ours ();
|
||
|
||
if (query ("Interrupted while waiting for the program.\n\
|
||
Give up (and stop debugging it)? "))
|
||
{
|
||
target_mourn_inferior ();
|
||
return_to_top_level (RETURN_QUIT);
|
||
}
|
||
|
||
target_terminal_inferior ();
|
||
}
|
||
|
||
/* If nonzero, ignore the next kill. */
|
||
int kill_kludge;
|
||
|
||
/* Wait until the remote machine stops, then return,
|
||
storing status in STATUS just as `wait' would.
|
||
Returns "pid" (though it's not clear what, if anything, that
|
||
means in the case of this target). */
|
||
|
||
static int
|
||
remote_wait (pid, status)
|
||
int pid;
|
||
struct target_waitstatus *status;
|
||
{
|
||
unsigned char buf[PBUFSIZ];
|
||
int thread_num = -1;
|
||
|
||
status->kind = TARGET_WAITKIND_EXITED;
|
||
status->value.integer = 0;
|
||
|
||
while (1)
|
||
{
|
||
unsigned char *p;
|
||
|
||
ofunc = (void (*)()) signal (SIGINT, remote_interrupt);
|
||
getpkt ((char *) buf, 1);
|
||
signal (SIGINT, ofunc);
|
||
|
||
switch (buf[0])
|
||
{
|
||
case 'E': /* Error of some sort */
|
||
warning ("Remote failure reply: %s", buf);
|
||
continue;
|
||
case 'T': /* Status with PC, SP, FP, ... */
|
||
{
|
||
int i;
|
||
long regno;
|
||
char regs[MAX_REGISTER_RAW_SIZE];
|
||
|
||
/* Expedited reply, containing Signal, {regno, reg} repeat */
|
||
/* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where
|
||
ss = signal number
|
||
n... = register number
|
||
r... = register contents
|
||
*/
|
||
|
||
p = &buf[3]; /* after Txx */
|
||
|
||
while (*p)
|
||
{
|
||
unsigned char *p1;
|
||
|
||
regno = strtol (p, &p1, 16); /* Read the register number */
|
||
|
||
if (p1 == p)
|
||
{
|
||
p1 = (unsigned char *) strchr (p, ':');
|
||
if (p1 == NULL)
|
||
warning ("Malformed packet (missing colon): %s\n\
|
||
Packet: '%s'\n",
|
||
p, buf);
|
||
if (strncmp (p, "thread", p1 - p) == 0)
|
||
{
|
||
char *p2;
|
||
thread_num = strtol (++p1, &p, 16);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
p = p1;
|
||
|
||
if (*p++ != ':')
|
||
warning ("Malformed packet (missing colon): %s\n\
|
||
Packet: '%s'\n",
|
||
p, buf);
|
||
|
||
if (regno >= NUM_REGS)
|
||
warning ("Remote sent bad register number %d: %s\n\
|
||
Packet: '%s'\n",
|
||
regno, p, buf);
|
||
|
||
for (i = 0; i < REGISTER_RAW_SIZE (regno); i++)
|
||
{
|
||
if (p[0] == 0 || p[1] == 0)
|
||
warning ("Remote reply is too short: %s", buf);
|
||
regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
p += 2;
|
||
}
|
||
supply_register (regno, regs);
|
||
}
|
||
|
||
if (*p++ != ';')
|
||
warning ("Remote register badly formatted: %s", buf);
|
||
}
|
||
}
|
||
/* fall through */
|
||
case 'S': /* Old style status, just signal only */
|
||
status->kind = TARGET_WAITKIND_STOPPED;
|
||
status->value.sig = (enum target_signal)
|
||
(((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
|
||
|
||
goto got_status;
|
||
case 'W': /* Target exited */
|
||
{
|
||
/* The remote process exited. */
|
||
status->kind = TARGET_WAITKIND_EXITED;
|
||
status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]);
|
||
goto got_status;
|
||
}
|
||
case 'X':
|
||
status->kind = TARGET_WAITKIND_SIGNALLED;
|
||
status->value.sig = (enum target_signal)
|
||
(((fromhex (buf[1])) << 4) + (fromhex (buf[2])));
|
||
kill_kludge = 1;
|
||
|
||
goto got_status;
|
||
case 'O': /* Console output */
|
||
fputs_filtered ((char *)(buf + 1), gdb_stdout);
|
||
continue;
|
||
case '\0':
|
||
if (last_sent_signal != TARGET_SIGNAL_0)
|
||
{
|
||
/* Zero length reply means that we tried 'S' or 'C' and
|
||
the remote system doesn't support it. */
|
||
target_terminal_ours_for_output ();
|
||
printf_filtered
|
||
("Can't send signals to this remote system. %s not sent.\n",
|
||
target_signal_to_name (last_sent_signal));
|
||
last_sent_signal = TARGET_SIGNAL_0;
|
||
target_terminal_inferior ();
|
||
|
||
strcpy (buf, last_sent_step ? 's' : 'c');
|
||
putpkt (buf);
|
||
continue;
|
||
}
|
||
/* else fallthrough */
|
||
default:
|
||
warning ("Invalid remote reply: %s", buf);
|
||
continue;
|
||
}
|
||
}
|
||
got_status:
|
||
if (thread_num != -1)
|
||
{
|
||
/* Initial thread value can only be acquired via wait, so deal with
|
||
this marker which is used before the first thread value is
|
||
acquired. */
|
||
if (inferior_pid == 42000)
|
||
{
|
||
inferior_pid = thread_num;
|
||
add_thread (inferior_pid);
|
||
}
|
||
return thread_num;
|
||
}
|
||
return inferior_pid;
|
||
}
|
||
|
||
/* Number of bytes of registers this stub implements. */
|
||
static int register_bytes_found;
|
||
|
||
/* Read the remote registers into the block REGS. */
|
||
/* Currently we just read all the registers, so we don't use regno. */
|
||
/* ARGSUSED */
|
||
static void
|
||
remote_fetch_registers (regno)
|
||
int regno;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
char regs[REGISTER_BYTES];
|
||
|
||
set_thread (inferior_pid, 1);
|
||
|
||
sprintf (buf, "g");
|
||
remote_send (buf);
|
||
|
||
/* Unimplemented registers read as all bits zero. */
|
||
memset (regs, 0, REGISTER_BYTES);
|
||
|
||
/* We can get out of synch in various cases. If the first character
|
||
in the buffer is not a hex character, assume that has happened
|
||
and try to fetch another packet to read. */
|
||
while ((buf[0] < '0' || buf[0] > '9')
|
||
&& (buf[0] < 'a' || buf[0] > 'f'))
|
||
{
|
||
if (remote_debug)
|
||
printf_unfiltered ("Bad register packet; fetching a new packet\n");
|
||
getpkt (buf, 0);
|
||
}
|
||
|
||
/* Reply describes registers byte by byte, each byte encoded as two
|
||
hex characters. Suck them all up, then supply them to the
|
||
register cacheing/storage mechanism. */
|
||
|
||
p = buf;
|
||
for (i = 0; i < REGISTER_BYTES; i++)
|
||
{
|
||
if (p[0] == 0)
|
||
break;
|
||
if (p[1] == 0)
|
||
{
|
||
warning ("Remote reply is of odd length: %s", buf);
|
||
/* Don't change register_bytes_found in this case, and don't
|
||
print a second warning. */
|
||
goto supply_them;
|
||
}
|
||
regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
p += 2;
|
||
}
|
||
|
||
if (i != register_bytes_found)
|
||
{
|
||
register_bytes_found = i;
|
||
#ifdef REGISTER_BYTES_OK
|
||
if (!REGISTER_BYTES_OK (i))
|
||
warning ("Remote reply is too short: %s", buf);
|
||
#endif
|
||
}
|
||
|
||
supply_them:
|
||
for (i = 0; i < NUM_REGS; i++)
|
||
supply_register (i, ®s[REGISTER_BYTE(i)]);
|
||
}
|
||
|
||
/* Prepare to store registers. Since we may send them all (using a
|
||
'G' request), we have to read out the ones we don't want to change
|
||
first. */
|
||
|
||
static void
|
||
remote_prepare_to_store ()
|
||
{
|
||
/* Make sure the entire registers array is valid. */
|
||
read_register_bytes (0, (char *)NULL, REGISTER_BYTES);
|
||
}
|
||
|
||
/* Store register REGNO, or all registers if REGNO == -1, from the contents
|
||
of REGISTERS. FIXME: ignores errors. */
|
||
|
||
static void
|
||
remote_store_registers (regno)
|
||
int regno;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
|
||
set_thread (inferior_pid, 1);
|
||
|
||
if (regno >= 0 && stub_supports_P)
|
||
{
|
||
/* Try storing a single register. */
|
||
char *regp;
|
||
|
||
sprintf (buf, "P%x=", regno);
|
||
p = buf + strlen (buf);
|
||
regp = ®isters[REGISTER_BYTE (regno)];
|
||
for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i)
|
||
{
|
||
*p++ = tohex ((regp[i] >> 4) & 0xf);
|
||
*p++ = tohex (regp[i] & 0xf);
|
||
}
|
||
*p = '\0';
|
||
remote_send (buf);
|
||
if (buf[0] != '\0')
|
||
{
|
||
/* The stub understands the 'P' request. We are done. */
|
||
return;
|
||
}
|
||
|
||
/* The stub does not support the 'P' request. Use 'G' instead,
|
||
and don't try using 'P' in the future (it will just waste our
|
||
time). */
|
||
stub_supports_P = 0;
|
||
}
|
||
|
||
buf[0] = 'G';
|
||
|
||
/* Command describes registers byte by byte,
|
||
each byte encoded as two hex characters. */
|
||
|
||
p = buf + 1;
|
||
/* remote_prepare_to_store insures that register_bytes_found gets set. */
|
||
for (i = 0; i < register_bytes_found; i++)
|
||
{
|
||
*p++ = tohex ((registers[i] >> 4) & 0xf);
|
||
*p++ = tohex (registers[i] & 0xf);
|
||
}
|
||
*p = '\0';
|
||
|
||
remote_send (buf);
|
||
}
|
||
|
||
#if 0
|
||
|
||
/* Use of the data cache is disabled because it loses for looking at
|
||
and changing hardware I/O ports and the like. Accepting `volatile'
|
||
would perhaps be one way to fix it, but a better way which would
|
||
win for more cases would be to use the executable file for the text
|
||
segment, like the `icache' code below but done cleanly (in some
|
||
target-independent place, perhaps in target_xfer_memory, perhaps
|
||
based on assigning each target a speed or perhaps by some simpler
|
||
mechanism). */
|
||
|
||
/* Read a word from remote address ADDR and return it.
|
||
This goes through the data cache. */
|
||
|
||
static int
|
||
remote_fetch_word (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
#if 0
|
||
if (icache)
|
||
{
|
||
extern CORE_ADDR text_start, text_end;
|
||
|
||
if (addr >= text_start && addr < text_end)
|
||
{
|
||
int buffer;
|
||
xfer_core_file (addr, &buffer, sizeof (int));
|
||
return buffer;
|
||
}
|
||
}
|
||
#endif
|
||
return dcache_fetch (remote_dcache, addr);
|
||
}
|
||
|
||
/* Write a word WORD into remote address ADDR.
|
||
This goes through the data cache. */
|
||
|
||
static void
|
||
remote_store_word (addr, word)
|
||
CORE_ADDR addr;
|
||
int word;
|
||
{
|
||
dcache_poke (remote_dcache, addr, word);
|
||
}
|
||
#endif /* 0 */
|
||
|
||
/* Write memory data directly to the remote machine.
|
||
This does not inform the data cache; the data cache uses this.
|
||
MEMADDR is the address in the remote memory space.
|
||
MYADDR is the address of the buffer in our space.
|
||
LEN is the number of bytes.
|
||
|
||
Returns number of bytes transferred, or 0 for error. */
|
||
|
||
static int
|
||
remote_write_bytes (memaddr, myaddr, len)
|
||
CORE_ADDR memaddr;
|
||
unsigned char *myaddr;
|
||
int len;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
|
||
/* FIXME-32x64: Need a version of print_address_numeric which puts the
|
||
result in a buffer like sprintf. */
|
||
sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, len);
|
||
|
||
/* We send target system values byte by byte, in increasing byte addresses,
|
||
each byte encoded as two hex characters. */
|
||
|
||
p = buf + strlen (buf);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
*p++ = tohex ((myaddr[i] >> 4) & 0xf);
|
||
*p++ = tohex (myaddr[i] & 0xf);
|
||
}
|
||
*p = '\0';
|
||
|
||
putpkt (buf);
|
||
getpkt (buf, 0);
|
||
|
||
if (buf[0] == 'E')
|
||
{
|
||
/* There is no correspondance between what the remote protocol uses
|
||
for errors and errno codes. We would like a cleaner way of
|
||
representing errors (big enough to include errno codes, bfd_error
|
||
codes, and others). But for now just return EIO. */
|
||
errno = EIO;
|
||
return 0;
|
||
}
|
||
return len;
|
||
}
|
||
|
||
/* Read memory data directly from the remote machine.
|
||
This does not use the data cache; the data cache uses this.
|
||
MEMADDR is the address in the remote memory space.
|
||
MYADDR is the address of the buffer in our space.
|
||
LEN is the number of bytes.
|
||
|
||
Returns number of bytes transferred, or 0 for error. */
|
||
|
||
static int
|
||
remote_read_bytes (memaddr, myaddr, len)
|
||
CORE_ADDR memaddr;
|
||
unsigned char *myaddr;
|
||
int len;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int i;
|
||
char *p;
|
||
|
||
if (len > PBUFSIZ / 2 - 1)
|
||
abort ();
|
||
|
||
/* FIXME-32x64: Need a version of print_address_numeric which puts the
|
||
result in a buffer like sprintf. */
|
||
sprintf (buf, "m%lx,%x", (unsigned long) memaddr, len);
|
||
putpkt (buf);
|
||
getpkt (buf, 0);
|
||
|
||
if (buf[0] == 'E')
|
||
{
|
||
/* There is no correspondance between what the remote protocol uses
|
||
for errors and errno codes. We would like a cleaner way of
|
||
representing errors (big enough to include errno codes, bfd_error
|
||
codes, and others). But for now just return EIO. */
|
||
errno = EIO;
|
||
return 0;
|
||
}
|
||
|
||
/* Reply describes memory byte by byte,
|
||
each byte encoded as two hex characters. */
|
||
|
||
p = buf;
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (p[0] == 0 || p[1] == 0)
|
||
/* Reply is short. This means that we were able to read only part
|
||
of what we wanted to. */
|
||
break;
|
||
myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
p += 2;
|
||
}
|
||
return i;
|
||
}
|
||
|
||
/* Read or write LEN bytes from inferior memory at MEMADDR, transferring
|
||
to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is
|
||
nonzero. Returns length of data written or read; 0 for error. */
|
||
|
||
/* ARGSUSED */
|
||
static int
|
||
remote_xfer_memory(memaddr, myaddr, len, should_write, target)
|
||
CORE_ADDR memaddr;
|
||
char *myaddr;
|
||
int len;
|
||
int should_write;
|
||
struct target_ops *target; /* ignored */
|
||
{
|
||
int xfersize;
|
||
int bytes_xferred;
|
||
int total_xferred = 0;
|
||
|
||
set_thread (inferior_pid, 1);
|
||
|
||
while (len > 0)
|
||
{
|
||
if (len > MAXBUFBYTES)
|
||
xfersize = MAXBUFBYTES;
|
||
else
|
||
xfersize = len;
|
||
|
||
if (should_write)
|
||
bytes_xferred = remote_write_bytes (memaddr,
|
||
(unsigned char *)myaddr, xfersize);
|
||
else
|
||
bytes_xferred = remote_read_bytes (memaddr,
|
||
(unsigned char *)myaddr, xfersize);
|
||
|
||
/* If we get an error, we are done xferring. */
|
||
if (bytes_xferred == 0)
|
||
break;
|
||
|
||
memaddr += bytes_xferred;
|
||
myaddr += bytes_xferred;
|
||
len -= bytes_xferred;
|
||
total_xferred += bytes_xferred;
|
||
}
|
||
return total_xferred;
|
||
}
|
||
|
||
#if 0
|
||
/* Enable after 4.12. */
|
||
|
||
void
|
||
remote_search (len, data, mask, startaddr, increment, lorange, hirange
|
||
addr_found, data_found)
|
||
int len;
|
||
char *data;
|
||
char *mask;
|
||
CORE_ADDR startaddr;
|
||
int increment;
|
||
CORE_ADDR lorange;
|
||
CORE_ADDR hirange;
|
||
CORE_ADDR *addr_found;
|
||
char *data_found;
|
||
{
|
||
if (increment == -4 && len == 4)
|
||
{
|
||
long mask_long, data_long;
|
||
long data_found_long;
|
||
CORE_ADDR addr_we_found;
|
||
char buf[PBUFSIZ];
|
||
long returned_long[2];
|
||
char *p;
|
||
|
||
mask_long = extract_unsigned_integer (mask, len);
|
||
data_long = extract_unsigned_integer (data, len);
|
||
sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long);
|
||
putpkt (buf);
|
||
getpkt (buf, 0);
|
||
if (buf[0] == '\0')
|
||
{
|
||
/* The stub doesn't support the 't' request. We might want to
|
||
remember this fact, but on the other hand the stub could be
|
||
switched on us. Maybe we should remember it only until
|
||
the next "target remote". */
|
||
generic_search (len, data, mask, startaddr, increment, lorange,
|
||
hirange, addr_found, data_found);
|
||
return;
|
||
}
|
||
|
||
if (buf[0] == 'E')
|
||
/* There is no correspondance between what the remote protocol uses
|
||
for errors and errno codes. We would like a cleaner way of
|
||
representing errors (big enough to include errno codes, bfd_error
|
||
codes, and others). But for now just use EIO. */
|
||
memory_error (EIO, startaddr);
|
||
p = buf;
|
||
addr_we_found = 0;
|
||
while (*p != '\0' && *p != ',')
|
||
addr_we_found = (addr_we_found << 4) + fromhex (*p++);
|
||
if (*p == '\0')
|
||
error ("Protocol error: short return for search");
|
||
|
||
data_found_long = 0;
|
||
while (*p != '\0' && *p != ',')
|
||
data_found_long = (data_found_long << 4) + fromhex (*p++);
|
||
/* Ignore anything after this comma, for future extensions. */
|
||
|
||
if (addr_we_found < lorange || addr_we_found >= hirange)
|
||
{
|
||
*addr_found = 0;
|
||
return;
|
||
}
|
||
|
||
*addr_found = addr_we_found;
|
||
*data_found = store_unsigned_integer (data_we_found, len);
|
||
return;
|
||
}
|
||
generic_search (len, data, mask, startaddr, increment, lorange,
|
||
hirange, addr_found, data_found);
|
||
}
|
||
#endif /* 0 */
|
||
|
||
static void
|
||
remote_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
puts_filtered ("Debugging a target over a serial line.\n");
|
||
}
|
||
|
||
/* Stuff for dealing with the packets which are part of this protocol.
|
||
See comment at top of file for details. */
|
||
|
||
/* Read a single character from the remote end, masking it down to 7 bits. */
|
||
|
||
static int
|
||
readchar (timeout)
|
||
int timeout;
|
||
{
|
||
int ch;
|
||
|
||
ch = SERIAL_READCHAR (remote_desc, timeout);
|
||
|
||
switch (ch)
|
||
{
|
||
case SERIAL_EOF:
|
||
error ("Remote connection closed");
|
||
case SERIAL_ERROR:
|
||
perror_with_name ("Remote communication error");
|
||
case SERIAL_TIMEOUT:
|
||
return ch;
|
||
default:
|
||
return ch & 0x7f;
|
||
}
|
||
}
|
||
|
||
/* Send the command in BUF to the remote machine,
|
||
and read the reply into BUF.
|
||
Report an error if we get an error reply. */
|
||
|
||
static void
|
||
remote_send (buf)
|
||
char *buf;
|
||
{
|
||
|
||
putpkt (buf);
|
||
getpkt (buf, 0);
|
||
|
||
if (buf[0] == 'E')
|
||
error ("Remote failure reply: %s", buf);
|
||
}
|
||
|
||
/* Send a packet to the remote machine, with error checking.
|
||
The data of the packet is in BUF. */
|
||
|
||
static int
|
||
putpkt (buf)
|
||
char *buf;
|
||
{
|
||
int i;
|
||
unsigned char csum = 0;
|
||
char buf2[PBUFSIZ];
|
||
int cnt = strlen (buf);
|
||
int ch;
|
||
char *p;
|
||
|
||
/* Copy the packet into buffer BUF2, encapsulating it
|
||
and giving it a checksum. */
|
||
|
||
if (cnt > sizeof(buf2) - 5) /* Prosanity check */
|
||
abort();
|
||
|
||
p = buf2;
|
||
*p++ = '$';
|
||
|
||
for (i = 0; i < cnt; i++)
|
||
{
|
||
csum += buf[i];
|
||
*p++ = buf[i];
|
||
}
|
||
*p++ = '#';
|
||
*p++ = tohex ((csum >> 4) & 0xf);
|
||
*p++ = tohex (csum & 0xf);
|
||
|
||
/* Send it over and over until we get a positive ack. */
|
||
|
||
while (1)
|
||
{
|
||
int started_error_output = 0;
|
||
|
||
if (remote_debug)
|
||
{
|
||
*p = '\0';
|
||
printf_unfiltered ("Sending packet: %s...", buf2);
|
||
gdb_flush(gdb_stdout);
|
||
}
|
||
if (SERIAL_WRITE (remote_desc, buf2, p - buf2))
|
||
perror_with_name ("putpkt: write failed");
|
||
|
||
/* read until either a timeout occurs (-2) or '+' is read */
|
||
while (1)
|
||
{
|
||
ch = readchar (remote_timeout);
|
||
|
||
if (remote_debug)
|
||
{
|
||
switch (ch)
|
||
{
|
||
case '+':
|
||
case SERIAL_TIMEOUT:
|
||
case '$':
|
||
if (started_error_output)
|
||
{
|
||
putc_unfiltered ('\n');
|
||
started_error_output = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
switch (ch)
|
||
{
|
||
case '+':
|
||
if (remote_debug)
|
||
printf_unfiltered("Ack\n");
|
||
return 1;
|
||
case SERIAL_TIMEOUT:
|
||
break; /* Retransmit buffer */
|
||
case '$':
|
||
{
|
||
char junkbuf[PBUFSIZ];
|
||
|
||
/* It's probably an old response, and we're out of sync. Just
|
||
gobble up the packet and ignore it. */
|
||
getpkt (junkbuf, 0);
|
||
continue; /* Now, go look for + */
|
||
}
|
||
default:
|
||
if (remote_debug)
|
||
{
|
||
if (!started_error_output)
|
||
{
|
||
started_error_output = 1;
|
||
printf_unfiltered ("putpkt: Junk: ");
|
||
}
|
||
putc_unfiltered (ch & 0177);
|
||
}
|
||
continue;
|
||
}
|
||
break; /* Here to retransmit */
|
||
}
|
||
|
||
#if 0
|
||
/* This is wrong. If doing a long backtrace, the user should be
|
||
able to get out next time we call QUIT, without anything as violent
|
||
as interrupt_query. If we want to provide a way out of here
|
||
without getting to the next QUIT, it should be based on hitting
|
||
^C twice as in remote_wait. */
|
||
if (quit_flag)
|
||
{
|
||
quit_flag = 0;
|
||
interrupt_query ();
|
||
}
|
||
#endif
|
||
}
|
||
}
|
||
|
||
/* Come here after finding the start of the frame. Collect the rest into BUF,
|
||
verifying the checksum, length, and handling run-length compression.
|
||
Returns 0 on any error, 1 on success. */
|
||
|
||
static int
|
||
read_frame (buf)
|
||
char *buf;
|
||
{
|
||
unsigned char csum;
|
||
char *bp;
|
||
int c;
|
||
|
||
csum = 0;
|
||
bp = buf;
|
||
|
||
while (1)
|
||
{
|
||
c = readchar (remote_timeout);
|
||
|
||
switch (c)
|
||
{
|
||
case SERIAL_TIMEOUT:
|
||
if (remote_debug)
|
||
puts_filtered ("Timeout in mid-packet, retrying\n");
|
||
return 0;
|
||
case '$':
|
||
if (remote_debug)
|
||
puts_filtered ("Saw new packet start in middle of old one\n");
|
||
return 0; /* Start a new packet, count retries */
|
||
case '#':
|
||
{
|
||
unsigned char pktcsum;
|
||
|
||
*bp = '\000';
|
||
|
||
pktcsum = fromhex (readchar (remote_timeout)) << 4;
|
||
pktcsum |= fromhex (readchar (remote_timeout));
|
||
|
||
if (csum == pktcsum)
|
||
return 1;
|
||
|
||
if (remote_debug)
|
||
{
|
||
printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=",
|
||
pktcsum, csum);
|
||
puts_filtered (buf);
|
||
puts_filtered ("\n");
|
||
}
|
||
return 0;
|
||
}
|
||
case '*': /* Run length encoding */
|
||
csum += c;
|
||
c = readchar (remote_timeout);
|
||
csum += c;
|
||
c = c - ' ' + 3; /* Compute repeat count */
|
||
|
||
|
||
if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1)
|
||
{
|
||
memset (bp, *(bp - 1), c);
|
||
bp += c;
|
||
continue;
|
||
}
|
||
|
||
*bp = '\0';
|
||
printf_filtered ("Repeat count %d too large for buffer: ", c);
|
||
puts_filtered (buf);
|
||
puts_filtered ("\n");
|
||
return 0;
|
||
|
||
default:
|
||
if (bp < buf + PBUFSIZ - 1)
|
||
{
|
||
*bp++ = c;
|
||
csum += c;
|
||
continue;
|
||
}
|
||
|
||
*bp = '\0';
|
||
puts_filtered ("Remote packet too long: ");
|
||
puts_filtered (buf);
|
||
puts_filtered ("\n");
|
||
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Read a packet from the remote machine, with error checking,
|
||
and store it in BUF. BUF is expected to be of size PBUFSIZ.
|
||
If FOREVER, wait forever rather than timing out; this is used
|
||
while the target is executing user code. */
|
||
|
||
static void
|
||
getpkt (buf, forever)
|
||
char *buf;
|
||
int forever;
|
||
{
|
||
char *bp;
|
||
int c;
|
||
int tries;
|
||
int timeout;
|
||
int val;
|
||
|
||
if (forever)
|
||
timeout = -1;
|
||
else
|
||
timeout = remote_timeout;
|
||
|
||
#define MAX_TRIES 10
|
||
|
||
for (tries = 1; tries <= MAX_TRIES; tries++)
|
||
{
|
||
/* This can loop forever if the remote side sends us characters
|
||
continuously, but if it pauses, we'll get a zero from readchar
|
||
because of timeout. Then we'll count that as a retry. */
|
||
|
||
/* Note that we will only wait forever prior to the start of a packet.
|
||
After that, we expect characters to arrive at a brisk pace. They
|
||
should show up within remote_timeout intervals. */
|
||
|
||
do
|
||
{
|
||
c = readchar (timeout);
|
||
|
||
if (c == SERIAL_TIMEOUT)
|
||
{
|
||
if (remote_debug)
|
||
puts_filtered ("Timed out.\n");
|
||
goto retry;
|
||
}
|
||
}
|
||
while (c != '$');
|
||
|
||
/* We've found the start of a packet, now collect the data. */
|
||
|
||
val = read_frame (buf);
|
||
|
||
if (val == 1)
|
||
{
|
||
if (remote_debug)
|
||
fprintf_unfiltered (gdb_stderr, "Packet received: %s\n", buf);
|
||
SERIAL_WRITE (remote_desc, "+", 1);
|
||
return;
|
||
}
|
||
|
||
/* Try the whole thing again. */
|
||
retry:
|
||
SERIAL_WRITE (remote_desc, "-", 1);
|
||
}
|
||
|
||
/* We have tried hard enough, and just can't receive the packet. Give up. */
|
||
|
||
printf_unfiltered ("Ignoring packet error, continuing...\n");
|
||
SERIAL_WRITE (remote_desc, "+", 1);
|
||
}
|
||
|
||
static void
|
||
remote_kill ()
|
||
{
|
||
/* For some mysterious reason, wait_for_inferior calls kill instead of
|
||
mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */
|
||
if (kill_kludge)
|
||
{
|
||
kill_kludge = 0;
|
||
target_mourn_inferior ();
|
||
return;
|
||
}
|
||
|
||
/* Use catch_errors so the user can quit from gdb even when we aren't on
|
||
speaking terms with the remote system. */
|
||
catch_errors (putpkt, "k", "", RETURN_MASK_ERROR);
|
||
|
||
/* Don't wait for it to die. I'm not really sure it matters whether
|
||
we do or not. For the existing stubs, kill is a noop. */
|
||
target_mourn_inferior ();
|
||
}
|
||
|
||
static void
|
||
remote_mourn ()
|
||
{
|
||
unpush_target (&remote_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
#ifdef REMOTE_BREAKPOINT
|
||
|
||
/* On some machines, e.g. 68k, we may use a different breakpoint instruction
|
||
than other targets. */
|
||
static unsigned char break_insn[] = REMOTE_BREAKPOINT;
|
||
|
||
/* Check that it fits in BREAKPOINT_MAX bytes. */
|
||
static unsigned char check_break_insn_size[BREAKPOINT_MAX] = REMOTE_BREAKPOINT;
|
||
|
||
#else /* No REMOTE_BREAKPOINT. */
|
||
|
||
/* Same old breakpoint instruction. This code does nothing different
|
||
than mem-break.c. */
|
||
static unsigned char break_insn[] = BREAKPOINT;
|
||
|
||
#endif /* No REMOTE_BREAKPOINT. */
|
||
|
||
/* Insert a breakpoint on targets that don't have any better breakpoint
|
||
support. We read the contents of the target location and stash it,
|
||
then overwrite it with a breakpoint instruction. ADDR is the target
|
||
location in the target machine. CONTENTS_CACHE is a pointer to
|
||
memory allocated for saving the target contents. It is guaranteed
|
||
by the caller to be long enough to save sizeof BREAKPOINT bytes (this
|
||
is accomplished via BREAKPOINT_MAX). */
|
||
|
||
static int
|
||
remote_insert_breakpoint (addr, contents_cache)
|
||
CORE_ADDR addr;
|
||
char *contents_cache;
|
||
{
|
||
int val;
|
||
|
||
val = target_read_memory (addr, contents_cache, sizeof break_insn);
|
||
|
||
if (val == 0)
|
||
val = target_write_memory (addr, (char *)break_insn, sizeof break_insn);
|
||
|
||
return val;
|
||
}
|
||
|
||
static int
|
||
remote_remove_breakpoint (addr, contents_cache)
|
||
CORE_ADDR addr;
|
||
char *contents_cache;
|
||
{
|
||
return target_write_memory (addr, contents_cache, sizeof break_insn);
|
||
}
|
||
|
||
/* Define the target subroutine names */
|
||
|
||
struct target_ops remote_ops = {
|
||
"remote", /* to_shortname */
|
||
"Remote serial target in gdb-specific protocol", /* to_longname */
|
||
"Use a remote computer via a serial line, using a gdb-specific protocol.\n\
|
||
Specify the serial device it is connected to (e.g. /dev/ttya).", /* to_doc */
|
||
remote_open, /* to_open */
|
||
remote_close, /* to_close */
|
||
NULL, /* to_attach */
|
||
remote_detach, /* to_detach */
|
||
remote_resume, /* to_resume */
|
||
remote_wait, /* to_wait */
|
||
remote_fetch_registers, /* to_fetch_registers */
|
||
remote_store_registers, /* to_store_registers */
|
||
remote_prepare_to_store, /* to_prepare_to_store */
|
||
remote_xfer_memory, /* to_xfer_memory */
|
||
remote_files_info, /* to_files_info */
|
||
|
||
remote_insert_breakpoint, /* to_insert_breakpoint */
|
||
remote_remove_breakpoint, /* to_remove_breakpoint */
|
||
|
||
NULL, /* to_terminal_init */
|
||
NULL, /* to_terminal_inferior */
|
||
NULL, /* to_terminal_ours_for_output */
|
||
NULL, /* to_terminal_ours */
|
||
NULL, /* to_terminal_info */
|
||
remote_kill, /* to_kill */
|
||
generic_load, /* to_load */
|
||
NULL, /* to_lookup_symbol */
|
||
NULL, /* to_create_inferior */
|
||
remote_mourn, /* to_mourn_inferior */
|
||
0, /* to_can_run */
|
||
0, /* to_notice_signals */
|
||
0, /* to_stop */
|
||
process_stratum, /* to_stratum */
|
||
NULL, /* to_next */
|
||
1, /* to_has_all_memory */
|
||
1, /* to_has_memory */
|
||
1, /* to_has_stack */
|
||
1, /* to_has_registers */
|
||
1, /* to_has_execution */
|
||
NULL, /* sections */
|
||
NULL, /* sections_end */
|
||
OPS_MAGIC /* to_magic */
|
||
};
|
||
|
||
void
|
||
_initialize_remote ()
|
||
{
|
||
add_target (&remote_ops);
|
||
}
|