3321 lines
83 KiB
C
3321 lines
83 KiB
C
/* Remote target communications for serial-line targets in custom GDB protocol
|
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Copyright 1988, 91, 92, 93, 94, 95, 96, 97, 1998
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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..AA Continue with signal sig (hex signal
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signal number). If ;AA..AA is omitted, resume
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at same address.
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step with Ssig;AA..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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detach D Reply OK.
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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... OXX..XX XX..XX is hex encoding of ASCII data. This
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can happen 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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thread alive TXX Find out if the thread XX is alive.
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reply OK thread is still alive
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ENN thread is dead
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remote restart RXX Restart the remote server
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extended ops ! Use the extended remote protocol.
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Sticky -- only needs to be set once.
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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 "gdb_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 "gdbthread.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 remote_write_bytes PARAMS ((CORE_ADDR memaddr,
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char *myaddr, int len));
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static int remote_read_bytes PARAMS ((CORE_ADDR memaddr,
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char *myaddr, int len));
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static void remote_files_info PARAMS ((struct target_ops * ignore));
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static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char * myaddr,
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int len, int should_write,
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struct target_ops * target));
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static void remote_prepare_to_store PARAMS ((void));
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static void remote_fetch_registers PARAMS ((int regno));
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static void remote_resume PARAMS ((int pid, int step,
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enum target_signal siggnal));
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static int remote_start_remote PARAMS ((char *dummy));
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static void remote_open PARAMS ((char *name, int from_tty));
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static void extended_remote_open PARAMS ((char *name, int from_tty));
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static void remote_open_1 PARAMS ((char *, int, struct target_ops *, int extended_p));
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static void remote_close PARAMS ((int quitting));
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static void remote_store_registers PARAMS ((int regno));
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static void remote_mourn PARAMS ((void));
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static void extended_remote_restart PARAMS ((void));
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static void extended_remote_mourn PARAMS ((void));
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static void extended_remote_create_inferior PARAMS ((char *, char *, char **));
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static void remote_mourn_1 PARAMS ((struct target_ops *));
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static void remote_send PARAMS ((char *buf));
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static int readchar PARAMS ((int timeout));
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static int remote_wait PARAMS ((int pid, struct target_waitstatus * status));
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static void remote_kill PARAMS ((void));
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static int tohex PARAMS ((int nib));
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static void remote_detach PARAMS ((char *args, int from_tty));
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static void remote_interrupt PARAMS ((int signo));
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static void interrupt_query PARAMS ((void));
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static void set_thread PARAMS ((int, int));
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static int remote_thread_alive PARAMS ((int));
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static void get_offsets PARAMS ((void));
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static int read_frame PARAMS ((char *));
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static int remote_insert_breakpoint PARAMS ((CORE_ADDR, char *));
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static int remote_remove_breakpoint PARAMS ((CORE_ADDR, char *));
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static int hexnumlen PARAMS ((ULONGEST num));
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static void init_remote_ops PARAMS ((void));
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static void init_extended_remote_ops PARAMS ((void));
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static void remote_stop PARAMS ((void));
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static int hexnumstr PARAMS ((char *, ULONGEST));
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static CORE_ADDR remote_address_masked PARAMS ((CORE_ADDR));
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static void print_packet PARAMS ((char *));
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static unsigned long crc32 PARAMS ((unsigned char *, int, unsigned int));
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static void compare_sections_command PARAMS ((char *, int));
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static void packet_command PARAMS ((char *, int));
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/* exported functions */
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extern int fromhex PARAMS ((int a));
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extern void getpkt PARAMS ((char *buf, int forever));
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extern int putpkt PARAMS ((char *buf));
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||
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void remote_console_output PARAMS ((char *));
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/* Define the target subroutine names */
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void open_remote_target PARAMS ((char *, int, struct target_ops *, int));
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void _initialize_remote PARAMS ((void));
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/* */
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static struct target_ops remote_ops;
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static struct target_ops extended_remote_ops;
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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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/* Changed to allow option to set timeout value.
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was static int remote_timeout = 2; */
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extern int remote_timeout;
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/* This variable chooses whether to send a ^C or a break when the user
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requests program interruption. Although ^C is usually what remote
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systems expect, and that is the default here, sometimes a break is
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preferable instead. */
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static int remote_break;
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/* Has the user attempted to interrupt the target? If so, then offer
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||
the user the opportunity to bail out completely if he interrupts
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again. */
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static int interrupted_already = 0;
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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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static 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)
|
||
|
||
/* 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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||
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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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||
|
||
/* This variable sets the number of bytes to be written to the target
|
||
in a single packet. Normally PBUFSIZ is satisfactory, but some
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targets need smaller values (perhaps because the receiving end
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is slow). */
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||
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static int remote_write_size = PBUFSIZ;
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||
|
||
/* This variable sets the number of bits in an address that are to be
|
||
sent in a memory ("M" or "m") packet. Normally, after stripping
|
||
leading zeros, the entire address would be sent. This variable
|
||
restricts the address to REMOTE_ADDRESS_SIZE bits. HISTORY: The
|
||
initial implementation of remote.c restricted the address sent in
|
||
memory packets to ``host::sizeof long'' bytes - (typically 32
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||
bits). Consequently, for 64 bit targets, the upper 32 bits of an
|
||
address was never sent. Since fixing this bug may cause a break in
|
||
some remote targets this variable is principly provided to
|
||
facilitate backward compatibility. */
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||
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||
static int remote_address_size;
|
||
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||
/* This is the size (in chars) of the first response to the `g' command. This
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||
is used to limit the size of the memory read and write commands to prevent
|
||
stub buffers from overflowing. The size does not include headers and
|
||
trailers, it is only the payload size. */
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||
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||
static int remote_register_buf_size = 0;
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||
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||
/* Should we try the 'P' request? If this is set to one when the stub
|
||
doesn't support 'P', the only consequence is some unnecessary traffic. */
|
||
static int stub_supports_P = 1;
|
||
|
||
/* These are pointers to hook functions that may be set in order to
|
||
modify resume/wait behavior for a particular architecture. */
|
||
|
||
void (*target_resume_hook) PARAMS ((void));
|
||
void (*target_wait_loop_hook) PARAMS ((void));
|
||
|
||
|
||
/* ------- REMOTE Thread (or) Process support ----------------------- */
|
||
|
||
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||
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||
static int
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||
stub_unpack_int PARAMS ((char *buff, int fieldlength));
|
||
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||
char *
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||
unpack_varlen_hex PARAMS ((char *buff, int *result));
|
||
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||
|
||
static char *
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||
unpack_nibble PARAMS ((char *buf, int *val));
|
||
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||
static char *
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||
unpack_nibble PARAMS ((char *buf, int *val));
|
||
|
||
static char *
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||
pack_hex_byte PARAMS ((char *pkt, unsigned char byte));
|
||
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||
static char *
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||
unpack_byte PARAMS ((char *buf, int *value));
|
||
|
||
static char *
|
||
pack_int PARAMS ((char *buf, int value));
|
||
|
||
static char *
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||
unpack_int PARAMS ((char *buf, int *value));
|
||
|
||
static char *
|
||
pack_string PARAMS ((char *pkt, char *string));
|
||
|
||
static char *
|
||
unpack_string PARAMS ((char *src, char *dest, int length));
|
||
|
||
static char *
|
||
pack_threadid PARAMS ((char *pkt, threadref * id));
|
||
|
||
static char *
|
||
unpack_threadid PARAMS ((char *inbuf, threadref * id));
|
||
|
||
void
|
||
int_to_threadref PARAMS ((threadref * id, int value));
|
||
|
||
|
||
int
|
||
threadref_to_int PARAMS ((threadref * ref));
|
||
|
||
static void
|
||
copy_threadref PARAMS ((threadref * dest, threadref * src));
|
||
|
||
static int
|
||
threadmatch PARAMS ((threadref * dest, threadref * src));
|
||
|
||
|
||
static char *
|
||
pack_threadinfo_request PARAMS ((char *pkt,
|
||
int mode,
|
||
threadref * id));
|
||
|
||
static int
|
||
remote_unpack_thread_info_response PARAMS ((
|
||
char *pkt,
|
||
threadref * expectedref,
|
||
struct gdb_ext_thread_info * info));
|
||
|
||
|
||
int
|
||
remote_get_threadinfo PARAMS ((
|
||
threadref * threadid,
|
||
int fieldset, /* TAG mask */
|
||
struct gdb_ext_thread_info * info));
|
||
|
||
int
|
||
adapt_remote_get_threadinfo PARAMS ((
|
||
gdb_threadref * ref,
|
||
int selection,
|
||
struct gdb_ext_thread_info * info));
|
||
static char *
|
||
pack_threadlist_request PARAMS ((
|
||
char *pkt,
|
||
int startflag,
|
||
int threadcount,
|
||
threadref * nextthread));
|
||
|
||
static int
|
||
parse_threadlist_response PARAMS ((
|
||
char *pkt,
|
||
int result_limit,
|
||
threadref * original_echo,
|
||
threadref * resultlist,
|
||
int *doneflag));
|
||
static int
|
||
remote_get_threadlist PARAMS ((
|
||
int startflag,
|
||
threadref * nextthread,
|
||
int result_limit,
|
||
int *done,
|
||
int *result_count,
|
||
threadref * threadlist));
|
||
|
||
|
||
|
||
static int
|
||
remote_newthread_step PARAMS ((
|
||
threadref * ref,
|
||
void *context));
|
||
|
||
int
|
||
remote_find_new_threads PARAMS ((void)) ;
|
||
|
||
static void
|
||
threadalive_test PARAMS ((char *cmd, int tty));
|
||
|
||
|
||
static void
|
||
threadset_test_cmd PARAMS ((char *cmd, int tty));
|
||
|
||
static void
|
||
threadlist_test_cmd PARAMS ((char *cmd,
|
||
int tty));
|
||
|
||
void
|
||
display_thread_info PARAMS ((struct gdb_ext_thread_info * info));
|
||
|
||
|
||
int
|
||
get_and_display_threadinfo PARAMS ((threadref * ref));
|
||
|
||
|
||
static void
|
||
threadinfo_test_cmd PARAMS ((char *cmd,
|
||
int tty));
|
||
|
||
static int
|
||
thread_display_step PARAMS ((
|
||
threadref * ref,
|
||
void *context));
|
||
|
||
|
||
static void
|
||
threadlist_update_test_cmd PARAMS ((char *cmd,
|
||
int tty));
|
||
|
||
|
||
static void
|
||
init_remote_threadtests PARAMS ((void));
|
||
|
||
/* These are the threads which we last sent to the remote system. -1 for all
|
||
or -2 for not sent yet. */
|
||
int general_thread;
|
||
int cont_thread;
|
||
|
||
/* Call this function as a result of
|
||
1) A halt indication (T packet) containing a thread id
|
||
2) A direct query of currthread
|
||
3) Successful execution of set thread
|
||
*/
|
||
|
||
static void
|
||
record_currthread (currthread)
|
||
int currthread;
|
||
{
|
||
inferior_pid = currthread;
|
||
general_thread = currthread;
|
||
cont_thread = currthread;
|
||
}
|
||
|
||
static void
|
||
set_thread (th, gen)
|
||
int th;
|
||
int gen;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
int state = gen ? general_thread : cont_thread;
|
||
if (state == th)
|
||
return;
|
||
buf[0] = 'H';
|
||
buf[1] = gen ? 'g' : 'c';
|
||
if (th == 42000)
|
||
{
|
||
buf[2] = '0';
|
||
buf[3] = '\0';
|
||
}
|
||
else if (th < 0)
|
||
sprintf (&buf[2], "-%x", -th);
|
||
else
|
||
sprintf (&buf[2], "%x", th);
|
||
putpkt (buf);
|
||
getpkt (buf, 0);
|
||
if (gen)
|
||
general_thread = th;
|
||
else
|
||
cont_thread = th;
|
||
}
|
||
|
||
/* Return nonzero if the thread TH is still alive on the remote system. */
|
||
|
||
static int
|
||
remote_thread_alive (th)
|
||
int th;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
|
||
buf[0] = 'T';
|
||
if (th < 0)
|
||
sprintf (&buf[1], "-%08x", -th);
|
||
else
|
||
sprintf (&buf[1], "%08x", th);
|
||
putpkt (buf);
|
||
getpkt (buf, 0);
|
||
return (buf[0] == 'O' && buf[1] == 'K');
|
||
}
|
||
|
||
/*
|
||
About these extended threadlist and threadinfo packets.
|
||
They are variable length packets but, the fields within them
|
||
are often fixed length.
|
||
They are redundent enough to send over UDP as is the remote protocol
|
||
in general.
|
||
There is a matching unit test module in libstub.
|
||
*/
|
||
|
||
|
||
#define BUF_THREAD_ID_SIZE (OPAQUETHREADBYTES*2)
|
||
/* encode 64 bits in 16 chars of hex */
|
||
|
||
|
||
static const char hexchars[] = "0123456789abcdef";
|
||
|
||
static int
|
||
ishex (ch, val)
|
||
char ch;
|
||
int *val;
|
||
{
|
||
if ((ch >= 'a') && (ch <= 'f'))
|
||
{
|
||
*val = ch - 'a' + 10;
|
||
return 1;
|
||
}
|
||
if ((ch >= 'A') && (ch <= 'F'))
|
||
{
|
||
*val = ch - 'A' + 10;
|
||
return 1;
|
||
}
|
||
if ((ch >= '0') && (ch <= '9'))
|
||
{
|
||
*val = ch - '0';
|
||
return 1;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
stubhex (ch)
|
||
unsigned char ch;
|
||
{
|
||
if (ch >= 'a' && ch <= 'f')
|
||
return ch - 'a' + 10;
|
||
if (ch >= '0' && ch <= '9')
|
||
return ch - '0';
|
||
if (ch >= 'A' && ch <= 'F')
|
||
return ch - 'A' + 10;
|
||
return -1;
|
||
}
|
||
|
||
static int
|
||
stub_unpack_int (buff, fieldlength)
|
||
char *buff;
|
||
int fieldlength;
|
||
{
|
||
int retval = 0;
|
||
int nibble;
|
||
while (fieldlength)
|
||
{
|
||
nibble = stubhex (*buff++);
|
||
retval |= nibble;
|
||
fieldlength--;
|
||
if (fieldlength)
|
||
retval = retval << 4;
|
||
}
|
||
return retval;
|
||
}
|
||
|
||
char *
|
||
unpack_varlen_hex (buff, result)
|
||
char *buff; /* packet to parse */
|
||
int *result;
|
||
{
|
||
int nibble;
|
||
int retval;
|
||
retval = 0;
|
||
|
||
while (ishex (*buff, &nibble))
|
||
{
|
||
buff++;
|
||
retval = retval << 4;
|
||
retval |= nibble & 0x0f;
|
||
}
|
||
*result = retval;
|
||
return buff;
|
||
}
|
||
|
||
static char *
|
||
unpack_nibble (buf, val)
|
||
char *buf;
|
||
int *val;
|
||
|
||
{
|
||
ishex (*buf++, val);
|
||
return buf;
|
||
}
|
||
|
||
static char *
|
||
pack_nibble (buf, nibble)
|
||
char *buf;
|
||
int nibble;
|
||
|
||
{
|
||
*buf++ = hexchars[(nibble & 0x0f)];
|
||
return buf;
|
||
}
|
||
|
||
static char *
|
||
pack_hex_byte (pkt, byte)
|
||
char *pkt;
|
||
unsigned char byte;
|
||
{
|
||
*pkt++ = hexchars[(byte >> 4) & 0xf];
|
||
*pkt++ = hexchars[(byte & 0xf)];
|
||
return pkt;
|
||
}
|
||
|
||
static char *
|
||
unpack_byte (buf, value)
|
||
char *buf;
|
||
int *value;
|
||
{
|
||
*value = stub_unpack_int (buf, 2);
|
||
return buf + 2;
|
||
}
|
||
|
||
|
||
static char *
|
||
pack_int (buf, value)
|
||
char *buf;
|
||
int value;
|
||
{
|
||
buf = pack_hex_byte (buf, (value >> 24) & 0xff);
|
||
buf = pack_hex_byte (buf, (value >> 16) & 0xff);
|
||
buf = pack_hex_byte (buf, (value >> 8) & 0x0ff);
|
||
buf = pack_hex_byte (buf, (value & 0xff));
|
||
return buf;
|
||
}
|
||
|
||
|
||
static char *
|
||
unpack_int (buf, value)
|
||
char *buf;
|
||
int *value;
|
||
{
|
||
*value = stub_unpack_int (buf, 8);
|
||
return buf + 8;
|
||
}
|
||
|
||
|
||
static char *
|
||
pack_string (pkt, string)
|
||
char *pkt;
|
||
char *string;
|
||
{
|
||
char ch;
|
||
int len;
|
||
len = strlen (string);
|
||
if (len > 200)
|
||
len = 200; /* Bigger than most GDB packets, junk??? */
|
||
pkt = pack_hex_byte (pkt, len);
|
||
while (len-- > 0)
|
||
{
|
||
ch = *string++;
|
||
if ((ch == '\0') || (ch == '#'))
|
||
ch = '*'; /* Protect encapsulation */
|
||
*pkt++ = ch;
|
||
}
|
||
return pkt;
|
||
}
|
||
|
||
static char *
|
||
unpack_string (src, dest, length)
|
||
char *src;
|
||
char *dest;
|
||
int length;
|
||
{
|
||
while (length--)
|
||
*dest++ = *src++;
|
||
*dest = '\0';
|
||
return src;
|
||
}
|
||
|
||
static char *
|
||
pack_threadid (pkt, id)
|
||
char *pkt;
|
||
threadref *id;
|
||
{
|
||
char *limit;
|
||
unsigned char *altid;
|
||
altid = (unsigned char *) id;
|
||
limit = pkt + BUF_THREAD_ID_SIZE;
|
||
while (pkt < limit)
|
||
pkt = pack_hex_byte (pkt, *altid++);
|
||
return pkt;
|
||
}
|
||
|
||
|
||
static char *
|
||
unpack_threadid (inbuf, id)
|
||
char *inbuf;
|
||
threadref *id;
|
||
{
|
||
char *altref;
|
||
char *limit = inbuf + BUF_THREAD_ID_SIZE;
|
||
int x, y;
|
||
altref = (char *) id;
|
||
|
||
while (inbuf < limit)
|
||
{
|
||
x = stubhex (*inbuf++);
|
||
y = stubhex (*inbuf++);
|
||
*altref++ = (x << 4) | y;
|
||
}
|
||
return inbuf;
|
||
}
|
||
|
||
/* Externally, threadrefs are 64 bits but internally, they are still
|
||
ints. This is due to a mismatch of specifications.
|
||
We would like to use 64bit thread references internally.
|
||
This is an adapter function.
|
||
*/
|
||
|
||
void
|
||
int_to_threadref (id, value)
|
||
threadref *id;
|
||
int value;
|
||
{
|
||
unsigned char *scan;
|
||
scan = (unsigned char *) id;
|
||
{
|
||
int i = 4;
|
||
while (i--)
|
||
*scan++ = 0;
|
||
}
|
||
*scan++ = (value >> 24) & 0xff;
|
||
*scan++ = (value >> 16) & 0xff;
|
||
*scan++ = (value >> 8) & 0xff;
|
||
*scan++ = (value & 0xff);
|
||
}
|
||
|
||
int
|
||
threadref_to_int (ref)
|
||
threadref *ref;
|
||
{
|
||
int value = 0;
|
||
unsigned char *scan;
|
||
int i;
|
||
|
||
scan = (char *) ref;
|
||
scan += 4;
|
||
i = 4;
|
||
while (i-- > 0)
|
||
value = (value << 8) | ((*scan++) & 0xff);
|
||
return value;
|
||
}
|
||
|
||
static void
|
||
copy_threadref (dest, src)
|
||
threadref *dest;
|
||
threadref *src;
|
||
{
|
||
int i;
|
||
unsigned char *csrc, *cdest;
|
||
csrc = (unsigned char *) src;
|
||
cdest = (unsigned char *) dest;
|
||
i = 8;
|
||
while (i--)
|
||
*cdest++ = *csrc++;
|
||
}
|
||
|
||
|
||
|
||
static int
|
||
threadmatch (dest, src)
|
||
threadref *dest;
|
||
threadref *src;
|
||
{
|
||
/* things are broken right now, so just assume we got a match */
|
||
#if 0
|
||
unsigned char *srcp, *destp;
|
||
int i, result;
|
||
srcp = (char *) src;
|
||
destp = (char *) dest;
|
||
|
||
result = 1;
|
||
while (i-- > 0)
|
||
result &= (*srcp++ == *destp++) ? 1 : 0;
|
||
return result;
|
||
#endif
|
||
return 1;
|
||
}
|
||
|
||
#if THREAD_PKT_TRACE
|
||
#define PKT_TRACE(title,packet) { printf_filtered("%s %s\n", title, packet);}
|
||
#else
|
||
#define PKT_TRACE(a,b) {}
|
||
#endif
|
||
|
||
|
||
/* ----- PACK_THREAD_INFO_REQUEST -------------------------------- */
|
||
|
||
/*
|
||
threadid:1, # always request threadid
|
||
context_exists:2,
|
||
display:4,
|
||
unique_name:8,
|
||
more_display:16
|
||
*/
|
||
|
||
/* Encoding: 'Q':8,'P':8,mask:32,threadid:64 */
|
||
|
||
static char *
|
||
pack_threadinfo_request PARAMS ((char *pkt,
|
||
int mode,
|
||
threadref * id));
|
||
|
||
static char *
|
||
pack_threadinfo_request (pkt, mode, id)
|
||
char *pkt;
|
||
int mode;
|
||
threadref *id;
|
||
{
|
||
char *base = pkt;
|
||
*pkt++ = 'q'; /* Info Query */
|
||
*pkt++ = 'P'; /* process or thread info */
|
||
pkt = pack_int (pkt, mode); /* mode */
|
||
pkt = pack_threadid (pkt, id); /* threadid */
|
||
*pkt = '\0'; /* terminate */
|
||
PKT_TRACE ("threadinfo-req ", base);
|
||
return pkt;
|
||
}
|
||
|
||
|
||
/* These values tag the fields in a thread info response packet */
|
||
/* Tagging the fields allows us to request specific fields and to
|
||
add more fields as time goes by */
|
||
#define TAG_THREADID 1 /* Echo the thread identifier */
|
||
#define TAG_EXISTS 2 /* It this process defined enough to
|
||
fetch registers and its stack */
|
||
#define TAG_DISPLAY 4 /* A short thing maybe to put on a window */
|
||
#define TAG_THREADNAME 8 /* string, maps 1-to-1 with a thread is */
|
||
#define TAG_MOREDISPLAY 16 /* Whatever the kernel wants to say about the process*/
|
||
|
||
|
||
static int
|
||
remote_unpack_thread_info_response (pkt, expectedref, info)
|
||
char *pkt;
|
||
threadref *expectedref;
|
||
struct gdb_ext_thread_info *info;
|
||
{
|
||
int mask, length;
|
||
unsigned int tag;
|
||
threadref ref;
|
||
char *limit = pkt + PBUFSIZ; /* plausable parsing limit */
|
||
int retval = 1;
|
||
|
||
PKT_TRACE ("unpack-threadinfo ", pkt);
|
||
|
||
/* info->threadid = 0; FIXME: implement zero_threadref */
|
||
info->active = 0;
|
||
info->display[0] = '\0';
|
||
info->shortname[0] = '\0';
|
||
info->more_display[0] = '\0';
|
||
|
||
/* Assume the characters indicating the packet type have been stripped */
|
||
pkt = unpack_int (pkt, &mask); /* arg mask */
|
||
pkt = unpack_threadid (pkt, &ref);
|
||
|
||
if (mask == 0)
|
||
warning("Incomplete response to threadinfo request\n");
|
||
if (!threadmatch (&ref, expectedref))
|
||
{ /* This is an answer to a different request */
|
||
warning("ERROR RMT Thread info mismatch\n");
|
||
return 0;
|
||
}
|
||
copy_threadref (&info->threadid, &ref);
|
||
|
||
/* Loop on tagged fields , try to bail if somthing goes wrong */
|
||
|
||
while ((pkt < limit) && mask && *pkt) /* packets are terminated with nulls */
|
||
{
|
||
pkt = unpack_int (pkt, &tag); /* tag */
|
||
pkt = unpack_byte (pkt, &length); /* length */
|
||
if (!(tag & mask)) /* tags out of synch with mask */
|
||
{
|
||
warning ("ERROR RMT: threadinfo tag mismatch\n");
|
||
retval = 0;
|
||
break;
|
||
}
|
||
if (tag == TAG_THREADID)
|
||
{
|
||
if (length != 16)
|
||
{
|
||
warning ("ERROR RMT: length of threadid is not 16\n");
|
||
retval = 0;
|
||
break;
|
||
}
|
||
pkt = unpack_threadid (pkt, &ref);
|
||
mask = mask & ~TAG_THREADID;
|
||
continue;
|
||
}
|
||
if (tag == TAG_EXISTS)
|
||
{
|
||
info->active = stub_unpack_int (pkt, length);
|
||
pkt += length;
|
||
mask = mask & ~(TAG_EXISTS);
|
||
if (length > 8)
|
||
{
|
||
warning ("ERROR RMT: 'exists' length too long\n");
|
||
retval = 0;
|
||
break;
|
||
}
|
||
continue;
|
||
}
|
||
if (tag == TAG_THREADNAME)
|
||
{
|
||
pkt = unpack_string (pkt, &info->shortname[0], length);
|
||
mask = mask & ~TAG_THREADNAME;
|
||
continue;
|
||
}
|
||
if (tag == TAG_DISPLAY)
|
||
{
|
||
pkt = unpack_string (pkt, &info->display[0], length);
|
||
mask = mask & ~TAG_DISPLAY;
|
||
continue;
|
||
}
|
||
if (tag == TAG_MOREDISPLAY)
|
||
{
|
||
pkt = unpack_string (pkt, &info->more_display[0], length);
|
||
mask = mask & ~TAG_MOREDISPLAY;
|
||
continue;
|
||
}
|
||
warning ("ERROR RMT: unknown thread info tag\n");
|
||
break; /* Not a tag we know about */
|
||
}
|
||
return retval;
|
||
}
|
||
|
||
|
||
/* ------ REMOTE_GET_THREADINFO -------------------------------------- */
|
||
|
||
int
|
||
remote_get_threadinfo (threadid, fieldset, info)
|
||
threadref *threadid;
|
||
int fieldset; /* TAG mask */
|
||
struct gdb_ext_thread_info *info;
|
||
{
|
||
int result;
|
||
char threadinfo_pkt[PBUFSIZ];
|
||
pack_threadinfo_request (threadinfo_pkt, fieldset, threadid);
|
||
putpkt (threadinfo_pkt);
|
||
getpkt (threadinfo_pkt, 0);
|
||
result = remote_unpack_thread_info_response (threadinfo_pkt + 2, threadid, info);
|
||
return result;
|
||
}
|
||
|
||
/* ------- ADAPT_remote_GET_THREADINFO - */
|
||
/* Unfortunatly, 61 but thread-ids are bugger than the internal
|
||
representation of a threadid. */
|
||
|
||
|
||
int
|
||
adapt_remote_get_threadinfo (ref, selection, info)
|
||
gdb_threadref *ref;
|
||
int selection;
|
||
struct gdb_ext_thread_info *info;
|
||
{
|
||
threadref lclref;
|
||
int_to_threadref (&lclref, *ref);
|
||
return remote_get_threadinfo (&lclref, selection, info);
|
||
}
|
||
|
||
|
||
/* -------- PACK_THREADLIST-REQUEST --------------------------------- */
|
||
/* Format: i'Q':8,i"L":8,initflag:8,batchsize:16,lastthreadid:32 */
|
||
|
||
static char *
|
||
pack_threadlist_request (pkt, startflag, threadcount, nextthread)
|
||
char *pkt;
|
||
int startflag;
|
||
int threadcount;
|
||
threadref *nextthread;
|
||
{
|
||
*pkt++ = 'q'; /* info query packet */
|
||
*pkt++ = 'L'; /* Process LIST or threadLIST request */
|
||
pkt = pack_nibble (pkt, startflag); /* initflag 1 bytes */
|
||
pkt = pack_hex_byte (pkt, threadcount); /* threadcount 2 bytes */
|
||
pkt = pack_threadid (pkt, nextthread); /* 64 bit thread identifier */
|
||
*pkt = '\0';
|
||
return pkt;
|
||
}
|
||
|
||
|
||
/* ---------- PARSE_THREADLIST_RESPONSE ------------------------------------ */
|
||
/* Encoding: 'q':8,'M':8,count:16,done:8,argthreadid:64,(threadid:64)* */
|
||
|
||
|
||
static int
|
||
parse_threadlist_response (pkt, result_limit, original_echo,
|
||
resultlist, doneflag)
|
||
char *pkt;
|
||
int result_limit;
|
||
threadref *original_echo;
|
||
threadref *resultlist;
|
||
int *doneflag;
|
||
{
|
||
char *limit;
|
||
int count, resultcount, done;
|
||
resultcount = 0;
|
||
|
||
/* assume the 'q' and 'M chars have been stripped */
|
||
PKT_TRACE ("parse-threadlist-response ", pkt);
|
||
limit = pkt + (PBUFSIZ - BUF_THREAD_ID_SIZE); /* done parse past here */
|
||
pkt = unpack_byte (pkt, &count); /* count field */
|
||
pkt = unpack_nibble (pkt, &done);
|
||
/* The first threadid is the argument threadid */
|
||
pkt = unpack_threadid (pkt, original_echo); /* should match query packet */
|
||
while ((count-- > 0) && (pkt < limit))
|
||
{
|
||
pkt = unpack_threadid (pkt, resultlist++);
|
||
if (resultcount++ >= result_limit)
|
||
break;
|
||
}
|
||
if (doneflag)
|
||
*doneflag = done;
|
||
return resultcount; /* successvalue */
|
||
}
|
||
|
||
|
||
|
||
static int
|
||
remote_get_threadlist (startflag, nextthread, result_limit,
|
||
done, result_count, threadlist)
|
||
int startflag;
|
||
threadref *nextthread;
|
||
int result_limit;
|
||
int *done;
|
||
int *result_count;
|
||
threadref *threadlist;
|
||
|
||
{
|
||
static threadref echo_nextthread;
|
||
char threadlist_packet[PBUFSIZ];
|
||
char t_response[PBUFSIZ];
|
||
int result = 1;
|
||
|
||
/* Trancate result limit to be smaller than the packet size */
|
||
if ((((result_limit + 1) * BUF_THREAD_ID_SIZE) + 10) >= PBUFSIZ)
|
||
result_limit = (PBUFSIZ / BUF_THREAD_ID_SIZE) - 2;
|
||
|
||
pack_threadlist_request (threadlist_packet,
|
||
startflag, result_limit, nextthread);
|
||
putpkt (threadlist_packet);
|
||
getpkt (t_response, 0);
|
||
*result_count = parse_threadlist_response (
|
||
t_response + 2, /* strip header */
|
||
result_limit,
|
||
&echo_nextthread,
|
||
threadlist,
|
||
done);
|
||
if (!threadmatch (&echo_nextthread, nextthread))
|
||
{
|
||
/* FIXME: This is a good reason to drop the packet */
|
||
/* Possably, there is a duplicate response */
|
||
/* Possabilities :
|
||
retransmit immediatly - race conditions
|
||
retransmit after timeout - yes
|
||
exit
|
||
wait for packet, then exit
|
||
*/
|
||
warning ("HMM: threadlist did not echo arg thread, dropping it\n");
|
||
return 0; /* I choose simply exiting */
|
||
}
|
||
if (*result_count <= 0)
|
||
{
|
||
if (*done != 1)
|
||
{
|
||
warning ("RMT ERROR : failed to get remote thread list\n");
|
||
result = 0;
|
||
}
|
||
return result; /* break; */
|
||
}
|
||
if (*result_count > result_limit)
|
||
{
|
||
*result_count = 0;
|
||
warning ("RMT ERROR: threadlist response longer than requested\n");
|
||
return 0;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
|
||
/* This is the interface between remote and threads, remotes upper interface */
|
||
/* remote_find_new_threads retreives the thread list and for each
|
||
thread in the list, looks up the thread in GDB's internal list,
|
||
ading the thread if it does not already exist.
|
||
This involves getting partial thread lists from the remote target so,
|
||
polling the quit_flag is required.
|
||
*/
|
||
|
||
typedef int (*rmt_thread_action) (
|
||
threadref * ref,
|
||
void *context
|
||
);
|
||
|
||
#define MAXTHREADLISTRESULTS 32 /* About this many threadisds fit in a packet */
|
||
|
||
static int
|
||
remote_threadlist_iterator PARAMS ((
|
||
rmt_thread_action stepfunction,
|
||
void *context,
|
||
int looplimit));
|
||
|
||
static int
|
||
remote_threadlist_iterator (stepfunction, context, looplimit)
|
||
rmt_thread_action stepfunction;
|
||
void *context;
|
||
int looplimit;
|
||
{
|
||
int done, i, result_count;
|
||
int startflag = 1;
|
||
int result = 1;
|
||
int loopcount = 0;
|
||
static threadref nextthread;
|
||
static threadref echo_nextthread;
|
||
static threadref resultthreadlist[MAXTHREADLISTRESULTS];
|
||
|
||
done = 0;
|
||
while (!done)
|
||
{
|
||
if (loopcount++ > looplimit)
|
||
{
|
||
result = 0;
|
||
warning ("Remote fetch threadlist -infinite loop-\n");
|
||
break;
|
||
}
|
||
if (!remote_get_threadlist (startflag,
|
||
&nextthread,
|
||
MAXTHREADLISTRESULTS,
|
||
&done,
|
||
&result_count,
|
||
resultthreadlist))
|
||
{
|
||
result = 0;
|
||
break;
|
||
}
|
||
startflag = 0; /* clear for later iterations */
|
||
/* Setup to resume next batch of thread references , set nestthread */
|
||
if (result_count >= 1)
|
||
copy_threadref (&nextthread, &resultthreadlist[result_count - 1]);
|
||
/* output_threadid("last-of-batch",&nextthread); */
|
||
i = 0;
|
||
while (result_count--)
|
||
if (!(result = (*stepfunction) (&resultthreadlist[i++], context)))
|
||
break;
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
static int
|
||
remote_newthread_step (ref, context)
|
||
threadref *ref;
|
||
void *context
|
||
;
|
||
|
||
{
|
||
int pid;
|
||
pid = threadref_to_int (ref);
|
||
if (!in_thread_list (pid))
|
||
add_thread (pid);
|
||
return 1; /* continue iterator */
|
||
}
|
||
|
||
#define CRAZY_MAX_THREADS 1000
|
||
|
||
|
||
int
|
||
remote_find_new_threads (void)
|
||
{
|
||
return remote_threadlist_iterator (remote_newthread_step, 0, CRAZY_MAX_THREADS);
|
||
} /* remote_find_new_threads */
|
||
|
||
int
|
||
remote_update_threads ()
|
||
{
|
||
/* Right now, this is empty. But it is one of the functions
|
||
defined for the thread target vector so it gets called.
|
||
If we were to allow the modification of the registers of
|
||
a suspended process, this would be implemented. */
|
||
return 0;
|
||
}
|
||
|
||
static struct target_thread_vector remote_thread_vec;
|
||
|
||
/* Initialize the thread vector which is used by threads.c */
|
||
/* The thread stubb is a package, it has an initializer */
|
||
void init_remote_threads ()
|
||
{
|
||
remote_thread_vec.find_new_threads = remote_find_new_threads;
|
||
remote_thread_vec.get_thread_info = adapt_remote_get_threadinfo;
|
||
}
|
||
|
||
/* --------- UNIT_TEST for THREAD oriented PACKETS -------------------------- */
|
||
|
||
#define SAMPLE_THREAD 0x05060708 /* Truncated 64 bit threadid */
|
||
|
||
|
||
static void
|
||
threadset_test_cmd (cmd, tty)
|
||
char *cmd;
|
||
int tty;
|
||
{
|
||
int sample_thread = SAMPLE_THREAD;
|
||
printf_filtered ("Remote threadset test\n");
|
||
set_thread (sample_thread, 1);
|
||
}
|
||
|
||
|
||
static void
|
||
threadalive_test (cmd, tty)
|
||
char *cmd;
|
||
int tty;
|
||
{
|
||
int sample_thread = SAMPLE_THREAD;
|
||
if (remote_thread_alive (sample_thread))
|
||
printf_filtered ("PASS: Thread alive test\n");
|
||
else
|
||
printf_filtered ("FAIL: Thread alive test\n");
|
||
}
|
||
|
||
void
|
||
output_threadid PARAMS ((char *title, threadref * ref));
|
||
|
||
void
|
||
output_threadid (title, ref)
|
||
char *title;
|
||
threadref *ref;
|
||
{
|
||
char hexid[20];
|
||
pack_threadid (&hexid[0], ref); /* Convert threead id into hex */
|
||
hexid[16] = 0;
|
||
printf_filtered ("%s %s\n", title, (&hexid[0]));
|
||
}
|
||
|
||
|
||
static void
|
||
threadlist_test_cmd (cmd, tty)
|
||
char *cmd;
|
||
int tty;
|
||
{
|
||
int startflag = 1;
|
||
threadref nextthread;
|
||
int done, result_count;
|
||
threadref threadlist[3];
|
||
|
||
printf_filtered ("Remote Threadlist test\n");
|
||
if (!remote_get_threadlist (startflag, &nextthread, 3, &done,
|
||
&result_count, &threadlist[0]))
|
||
printf_filtered ("FAIL: threadlist test\n");
|
||
else
|
||
{
|
||
threadref *scan = threadlist;
|
||
threadref *limit = scan + result_count;
|
||
while (scan < limit)
|
||
output_threadid (" thread ", scan++);
|
||
}
|
||
}
|
||
|
||
void
|
||
display_thread_info (info)
|
||
struct gdb_ext_thread_info *info;
|
||
{
|
||
|
||
output_threadid ("Threadid: ", &info->threadid);
|
||
/* short name */
|
||
printf_filtered ("Name: %s\n ", info->shortname);
|
||
/* format display state */
|
||
printf_filtered ("State: %s\n", info->display);
|
||
/* additional data */
|
||
printf_filtered ("other: %s\n\n", info->more_display);
|
||
}
|
||
|
||
int
|
||
get_and_display_threadinfo (ref)
|
||
threadref *ref;
|
||
{
|
||
int result;
|
||
int set;
|
||
struct gdb_ext_thread_info threadinfo;
|
||
|
||
set = TAG_THREADID | TAG_EXISTS | TAG_THREADNAME
|
||
| TAG_MOREDISPLAY | TAG_DISPLAY;
|
||
if (0 != (result = remote_get_threadinfo (ref, set, &threadinfo)))
|
||
display_thread_info (&threadinfo);
|
||
return result;
|
||
}
|
||
|
||
static void
|
||
threadinfo_test_cmd (cmd, tty)
|
||
char *cmd;
|
||
int tty;
|
||
{
|
||
int athread = SAMPLE_THREAD;
|
||
threadref thread;
|
||
int set;
|
||
|
||
int_to_threadref (&thread, athread);
|
||
printf_filtered ("Remote Threadinfo test\n");
|
||
if (!get_and_display_threadinfo (&thread))
|
||
printf_filtered ("FAIL cannot get thread info\n");
|
||
}
|
||
|
||
|
||
static int
|
||
thread_display_step (ref, context)
|
||
threadref *ref;
|
||
void *context;
|
||
{
|
||
/* output_threadid(" threadstep ",ref); *//* simple test */
|
||
return get_and_display_threadinfo (ref);
|
||
}
|
||
|
||
|
||
static void
|
||
threadlist_update_test_cmd (cmd, tty)
|
||
char *cmd;
|
||
int tty;
|
||
{
|
||
printf_filtered ("Remote Threadlist update test\n");
|
||
remote_threadlist_iterator (thread_display_step, 0, CRAZY_MAX_THREADS);
|
||
}
|
||
|
||
static void
|
||
init_remote_threadtests (void)
|
||
{
|
||
add_com ("tlist", class_obscure, threadlist_test_cmd,
|
||
"Fetch and print the remote list of thread identifiers, one pkt only");
|
||
add_com ("tinfo", class_obscure, threadinfo_test_cmd,
|
||
"Fetch and display info about one thread");
|
||
add_com ("tset", class_obscure, threadset_test_cmd,
|
||
"Test setting to a different thread");
|
||
add_com ("tupd", class_obscure, threadlist_update_test_cmd,
|
||
"Iterate through updating all remote thread info");
|
||
add_com ("talive", class_obscure, threadalive_test,
|
||
" Remote thread alive test ");
|
||
}
|
||
|
||
#define INIT_REMOTE_THREADTESTS { init_remote_threadtests();}
|
||
/* END OF REMOTE THREAD UNIT TESTS */
|
||
|
||
|
||
/* Restart the remote side; this is an extended protocol operation. */
|
||
|
||
static void
|
||
extended_remote_restart ()
|
||
{
|
||
char buf[PBUFSIZ];
|
||
|
||
/* Send the restart command; for reasons I don't understand the
|
||
remote side really expects a number after the "R". */
|
||
buf[0] = 'R';
|
||
sprintf (&buf[1], "%x", 0);
|
||
putpkt (buf);
|
||
|
||
/* Now query for status so this looks just like we restarted
|
||
gdbserver from scratch. */
|
||
putpkt ("?");
|
||
getpkt (buf, 0);
|
||
}
|
||
|
||
/* Clean up connection to a remote debugger. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
remote_close (quitting)
|
||
int quitting;
|
||
{
|
||
if (remote_desc)
|
||
SERIAL_CLOSE (remote_desc);
|
||
remote_desc = NULL;
|
||
}
|
||
|
||
/* Query the remote side for the text, data and bss offsets. */
|
||
|
||
static void
|
||
get_offsets ()
|
||
{
|
||
char buf[PBUFSIZ], *ptr;
|
||
int lose;
|
||
CORE_ADDR text_addr, data_addr, bss_addr;
|
||
struct section_offsets *offs;
|
||
|
||
putpkt ("qOffsets");
|
||
|
||
getpkt (buf, 0);
|
||
|
||
if (buf[0] == '\000')
|
||
return; /* Return silently. Stub doesn't support this
|
||
command. */
|
||
if (buf[0] == 'E')
|
||
{
|
||
warning ("Remote failure reply: %s", buf);
|
||
return;
|
||
}
|
||
|
||
/* Pick up each field in turn. This used to be done with scanf, but
|
||
scanf will make trouble if CORE_ADDR size doesn't match
|
||
conversion directives correctly. The following code will work
|
||
with any size of CORE_ADDR. */
|
||
text_addr = data_addr = bss_addr = 0;
|
||
ptr = buf;
|
||
lose = 0;
|
||
|
||
if (strncmp (ptr, "Text=", 5) == 0)
|
||
{
|
||
ptr += 5;
|
||
/* Don't use strtol, could lose on big values. */
|
||
while (*ptr && *ptr != ';')
|
||
text_addr = (text_addr << 4) + fromhex (*ptr++);
|
||
}
|
||
else
|
||
lose = 1;
|
||
|
||
if (!lose && strncmp (ptr, ";Data=", 6) == 0)
|
||
{
|
||
ptr += 6;
|
||
while (*ptr && *ptr != ';')
|
||
data_addr = (data_addr << 4) + fromhex (*ptr++);
|
||
}
|
||
else
|
||
lose = 1;
|
||
|
||
if (!lose && strncmp (ptr, ";Bss=", 5) == 0)
|
||
{
|
||
ptr += 5;
|
||
while (*ptr && *ptr != ';')
|
||
bss_addr = (bss_addr << 4) + fromhex (*ptr++);
|
||
}
|
||
else
|
||
lose = 1;
|
||
|
||
if (lose)
|
||
error ("Malformed response to offset query, %s", buf);
|
||
|
||
if (symfile_objfile == NULL)
|
||
return;
|
||
|
||
offs = (struct section_offsets *) alloca (sizeof (struct section_offsets)
|
||
+ symfile_objfile->num_sections
|
||
* sizeof (offs->offsets));
|
||
memcpy (offs, symfile_objfile->section_offsets,
|
||
sizeof (struct section_offsets)
|
||
+ symfile_objfile->num_sections
|
||
* sizeof (offs->offsets));
|
||
|
||
ANOFFSET (offs, SECT_OFF_TEXT) = text_addr;
|
||
|
||
/* This is a temporary kludge to force data and bss to use the same offsets
|
||
because that's what nlmconv does now. The real solution requires changes
|
||
to the stub and remote.c that I don't have time to do right now. */
|
||
|
||
ANOFFSET (offs, SECT_OFF_DATA) = data_addr;
|
||
ANOFFSET (offs, SECT_OFF_BSS) = data_addr;
|
||
|
||
objfile_relocate (symfile_objfile, offs);
|
||
}
|
||
|
||
/* Stub for catch_errors. */
|
||
|
||
static int
|
||
remote_start_remote (dummy)
|
||
char *dummy;
|
||
{
|
||
immediate_quit = 1; /* Allow user to interrupt it */
|
||
|
||
/* Ack any packet which the remote side has already sent. */
|
||
SERIAL_WRITE (remote_desc, "+", 1);
|
||
|
||
/* Let the stub know that we want it to return the thread. */
|
||
set_thread (-1, 0);
|
||
|
||
get_offsets (); /* Get text, data & bss offsets */
|
||
|
||
putpkt ("?"); /* initiate a query from remote machine */
|
||
immediate_quit = 0;
|
||
|
||
start_remote (); /* Initialize gdb process mechanisms */
|
||
return 1;
|
||
}
|
||
|
||
/* Open a connection to a remote debugger.
|
||
NAME is the filename used for communication. */
|
||
|
||
static void
|
||
remote_open (name, from_tty)
|
||
char *name;
|
||
int from_tty;
|
||
{
|
||
remote_open_1 (name, from_tty, &remote_ops, 0);
|
||
}
|
||
|
||
/* Open a connection to a remote debugger using the extended
|
||
remote gdb protocol. NAME is the filename used for communication. */
|
||
|
||
static void
|
||
extended_remote_open (name, from_tty)
|
||
char *name;
|
||
int from_tty;
|
||
{
|
||
remote_open_1 (name, from_tty, &extended_remote_ops, 1/*extended_p*/);
|
||
}
|
||
|
||
/* Generic code for opening a connection to a remote target. */
|
||
static DCACHE *remote_dcache;
|
||
|
||
static void
|
||
remote_open_1 (name, from_tty, target, extended_p)
|
||
char *name;
|
||
int from_tty;
|
||
struct target_ops *target;
|
||
int extended_p;
|
||
{
|
||
if (name == 0)
|
||
error ("To open a remote debug connection, you need to specify what serial\n\
|
||
device is attached to the remote system (e.g. /dev/ttya).");
|
||
|
||
target_preopen (from_tty);
|
||
|
||
unpush_target (target);
|
||
|
||
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 (target); /* Switch to using remote target now */
|
||
/* The target vector does not have the thread functions in it yet,
|
||
so we use this function to call back into the thread module and
|
||
register the thread vector and its contained functions. */
|
||
bind_target_thread_vector(&remote_thread_vec);
|
||
/* 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();
|
||
return;
|
||
}
|
||
|
||
if (extended_p)
|
||
{
|
||
/* tell the remote that we're using the extended protocol. */
|
||
char buf[PBUFSIZ];
|
||
putpkt ("!");
|
||
getpkt (buf, 0);
|
||
}
|
||
}
|
||
|
||
/* This takes a program previously attached to and detaches it. After
|
||
this is done, GDB can be used to debug some other program. We
|
||
better not have left any breakpoints in the target program or it'll
|
||
die when it hits one. */
|
||
|
||
static void
|
||
remote_detach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
|
||
if (args)
|
||
error ("Argument given to \"detach\" when remotely debugging.");
|
||
|
||
/* Tell the remote target to detach. */
|
||
strcpy (buf, "D");
|
||
remote_send (buf);
|
||
|
||
pop_target ();
|
||
if (from_tty)
|
||
puts_filtered ("Ending remote debugging.\n");
|
||
}
|
||
|
||
/* Convert hex digit A to a number. */
|
||
|
||
int
|
||
fromhex (a)
|
||
int a;
|
||
{
|
||
if (a >= '0' && a <= '9')
|
||
return a - '0';
|
||
else if (a >= 'a' && a <= 'f')
|
||
return a - 'a' + 10;
|
||
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;
|
||
|
||
/* A hook for when we need to do something at the last moment before
|
||
resumption. */
|
||
if (target_resume_hook)
|
||
(*target_resume_hook) ();
|
||
|
||
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 (*ofunc) PARAMS ((int));
|
||
|
||
static void
|
||
remote_interrupt (signo)
|
||
int signo;
|
||
{
|
||
remote_stop ();
|
||
signal (signo, remote_interrupt);
|
||
}
|
||
|
||
static void
|
||
remote_stop ()
|
||
{
|
||
if (!interrupted_already)
|
||
{
|
||
/* Send a break or a ^C, depending on user preference. */
|
||
interrupted_already = 1;
|
||
|
||
if (remote_debug)
|
||
printf_unfiltered ("remote_stop called\n");
|
||
|
||
if (remote_break)
|
||
SERIAL_SEND_BREAK (remote_desc);
|
||
else
|
||
SERIAL_WRITE (remote_desc, "\003", 1);
|
||
}
|
||
else
|
||
{
|
||
signal (SIGINT, ofunc);
|
||
interrupt_query ();
|
||
signal (SIGINT, remote_interrupt);
|
||
interrupted_already = 0;
|
||
}
|
||
}
|
||
|
||
/* 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;
|
||
|
||
void
|
||
remote_console_output (msg)
|
||
char *msg;
|
||
{
|
||
char *p;
|
||
|
||
for (p = msg; *p; p +=2)
|
||
{
|
||
char tb[2];
|
||
char c = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
tb[0] = c;
|
||
tb[1] = 0;
|
||
if (target_output_hook)
|
||
target_output_hook (tb);
|
||
else
|
||
fputs_filtered (tb, gdb_stdout);
|
||
}
|
||
}
|
||
|
||
/* 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;
|
||
|
||
interrupted_already = 0;
|
||
ofunc = signal (SIGINT, remote_interrupt);
|
||
getpkt ((char *) buf, 1);
|
||
signal (SIGINT, ofunc);
|
||
|
||
/* This is a hook for when we need to do something (perhaps the
|
||
collection of trace data) every time the target stops. */
|
||
if (target_wait_loop_hook)
|
||
(*target_wait_loop_hook) ();
|
||
|
||
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;
|
||
char *p_temp;
|
||
|
||
regno = strtol ((const char *) p, &p_temp, 16); /* Read the register number */
|
||
p1 = (unsigned char *)p_temp;
|
||
|
||
if (p1 == p) /* No register number present here */
|
||
{
|
||
p1 = (unsigned char *) strchr ((const char *) p, ':');
|
||
if (p1 == NULL)
|
||
warning ("Malformed packet(a) (missing colon): %s\n\
|
||
Packet: '%s'\n",
|
||
p, buf);
|
||
if (strncmp ((const char *) p, "thread", p1 - p) == 0)
|
||
{
|
||
p_temp = unpack_varlen_hex(++p1,&thread_num);
|
||
record_currthread(thread_num);
|
||
p = (unsigned char *)p_temp;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
p = p1;
|
||
|
||
if (*p++ != ':')
|
||
warning ("Malformed packet(b) (missing colon): %s\n\
|
||
Packet: '%s'\n",
|
||
p, buf);
|
||
|
||
if (regno >= NUM_REGS)
|
||
warning ("Remote sent bad register number %ld: %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);
|
||
warning (" here: %s",p);
|
||
}
|
||
}
|
||
}
|
||
/* 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 */
|
||
remote_console_output (buf + 1);
|
||
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 ((char *) buf, last_sent_step ? "s" : "c");
|
||
putpkt ((char *) 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);
|
||
|
||
if (remote_register_buf_size == 0)
|
||
remote_register_buf_size = strlen (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')
|
||
&& buf[0] != 'x') /* New: unavailable register value */
|
||
{
|
||
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;
|
||
}
|
||
if (p[0] == 'x' && p[1] == 'x')
|
||
regs[i] = 0; /* 'x' */
|
||
else
|
||
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)]);
|
||
if (buf[REGISTER_BYTE(i) * 2] == 'x')
|
||
register_valid[i] = -1; /* register value not available */
|
||
}
|
||
}
|
||
|
||
/* 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);
|
||
}
|
||
|
||
/*
|
||
Use of the data cache *used* to be 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. Another idea would be to use the
|
||
executable file for the text segment (for all SEC_CODE sections?
|
||
For all SEC_READONLY sections?). This has problems if you want to
|
||
actually see what the memory contains (e.g. self-modifying code,
|
||
clobbered memory, user downloaded the wrong thing).
|
||
|
||
Because it speeds so much up, it's now enabled, if you're playing
|
||
with registers you turn it of (set remotecache 0)
|
||
*/
|
||
|
||
/* Read a word from remote address ADDR and return it.
|
||
This goes through the data cache. */
|
||
|
||
#if 0 /* unused? */
|
||
static int
|
||
remote_fetch_word (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
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 (unused?) */
|
||
|
||
|
||
|
||
/* Return the number of hex digits in num. */
|
||
|
||
static int
|
||
hexnumlen (num)
|
||
ULONGEST num;
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; num != 0; i++)
|
||
num >>= 4;
|
||
|
||
return max (i, 1);
|
||
}
|
||
|
||
/* Set BUF to the hex digits representing NUM */
|
||
|
||
static int
|
||
hexnumstr (buf, num)
|
||
char *buf;
|
||
ULONGEST num;
|
||
{
|
||
int i;
|
||
int len = hexnumlen (num);
|
||
|
||
buf[len] = '\0';
|
||
|
||
for (i = len - 1; i >= 0; i--)
|
||
{
|
||
buf[i] = "0123456789abcdef" [(num & 0xf)];
|
||
num >>= 4;
|
||
}
|
||
|
||
return len;
|
||
}
|
||
|
||
/* Mask all but the least significant REMOTE_ADDRESS_SIZE bits */
|
||
|
||
static CORE_ADDR
|
||
remote_address_masked (addr)
|
||
CORE_ADDR addr;
|
||
{
|
||
if (remote_address_size > 0
|
||
&& remote_address_size < (sizeof (ULONGEST) * 8))
|
||
{
|
||
/* Only create a mask when that mask can safely be constructed
|
||
in a ULONGEST variable. */
|
||
ULONGEST mask = 1;
|
||
mask = (mask << remote_address_size) - 1;
|
||
addr &= mask;
|
||
}
|
||
return addr;
|
||
}
|
||
|
||
/* 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;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
int max_buf_size; /* Max size of packet output buffer */
|
||
int origlen;
|
||
|
||
/* Chop the transfer down if necessary */
|
||
|
||
max_buf_size = min (remote_write_size, PBUFSIZ);
|
||
if (remote_register_buf_size != 0)
|
||
max_buf_size = min (max_buf_size, remote_register_buf_size);
|
||
|
||
/* Subtract header overhead from max payload size - $M<memaddr>,<len>:#nn */
|
||
max_buf_size -= 2 + hexnumlen (memaddr + len - 1) + 1 + hexnumlen (len) + 4;
|
||
|
||
origlen = len;
|
||
while (len > 0)
|
||
{
|
||
char buf[PBUFSIZ];
|
||
char *p;
|
||
int todo;
|
||
int i;
|
||
|
||
todo = min (len, max_buf_size / 2); /* num bytes that will fit */
|
||
|
||
/* construct "M"<memaddr>","<len>":" */
|
||
/* sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo); */
|
||
memaddr = remote_address_masked (memaddr);
|
||
p = buf;
|
||
*p++ = 'M';
|
||
p += hexnumstr (p, (ULONGEST) memaddr);
|
||
*p++ = ',';
|
||
p += hexnumstr (p, (ULONGEST) todo);
|
||
*p++ = ':';
|
||
*p = '\0';
|
||
|
||
/* We send target system values byte by byte, in increasing byte addresses,
|
||
each byte encoded as two hex characters. */
|
||
|
||
for (i = 0; i < todo; 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;
|
||
}
|
||
myaddr += todo;
|
||
memaddr += todo;
|
||
len -= todo;
|
||
}
|
||
return origlen;
|
||
}
|
||
|
||
/* 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;
|
||
char *myaddr;
|
||
int len;
|
||
{
|
||
int max_buf_size; /* Max size of packet output buffer */
|
||
int origlen;
|
||
|
||
/* Chop the transfer down if necessary */
|
||
|
||
max_buf_size = min (remote_write_size, PBUFSIZ);
|
||
if (remote_register_buf_size != 0)
|
||
max_buf_size = min (max_buf_size, remote_register_buf_size);
|
||
|
||
origlen = len;
|
||
while (len > 0)
|
||
{
|
||
char buf[PBUFSIZ];
|
||
char *p;
|
||
int todo;
|
||
int i;
|
||
|
||
todo = min (len, max_buf_size / 2); /* num bytes that will fit */
|
||
|
||
/* construct "m"<memaddr>","<len>" */
|
||
/* sprintf (buf, "m%lx,%x", (unsigned long) memaddr, todo); */
|
||
memaddr = remote_address_masked (memaddr);
|
||
p = buf;
|
||
*p++ = 'm';
|
||
p += hexnumstr (p, (ULONGEST) memaddr);
|
||
*p++ = ',';
|
||
p += hexnumstr (p, (ULONGEST) todo);
|
||
*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;
|
||
}
|
||
|
||
/* Reply describes memory byte by byte,
|
||
each byte encoded as two hex characters. */
|
||
|
||
p = buf;
|
||
for (i = 0; i < todo; 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. */
|
||
return i + (origlen - len);
|
||
myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]);
|
||
p += 2;
|
||
}
|
||
myaddr += todo;
|
||
memaddr += todo;
|
||
len -= todo;
|
||
}
|
||
return origlen;
|
||
}
|
||
|
||
/* 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 */
|
||
{
|
||
#ifdef REMOTE_TRANSLATE_XFER_ADDRESS
|
||
CORE_ADDR targaddr;
|
||
int targlen;
|
||
REMOTE_TRANSLATE_XFER_ADDRESS (memaddr, len, targaddr, targlen);
|
||
if (targlen == 0)
|
||
return 0;
|
||
memaddr = targaddr;
|
||
len = targlen;
|
||
#endif
|
||
|
||
return dcache_xfer_memory (remote_dcache, memaddr, myaddr, len, should_write);
|
||
}
|
||
|
||
|
||
#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);
|
||
}
|
||
|
||
/* Display a null-terminated packet on stdout, for debugging, using C
|
||
string notation. */
|
||
|
||
static void
|
||
print_packet (buf)
|
||
char *buf;
|
||
{
|
||
puts_filtered ("\"");
|
||
while (*buf)
|
||
gdb_printchar (*buf++, gdb_stdout, '"');
|
||
puts_filtered ("\"");
|
||
}
|
||
|
||
|
||
/* Send a packet to the remote machine, with error checking.
|
||
The data of the packet is in BUF. */
|
||
|
||
int
|
||
putpkt (buf)
|
||
char *buf;
|
||
{
|
||
int i;
|
||
unsigned char csum = 0;
|
||
char buf2[PBUFSIZ];
|
||
int cnt = strlen (buf);
|
||
int ch;
|
||
int tcount = 0;
|
||
char *p;
|
||
|
||
/* Copy the packet into buffer BUF2, encapsulating it
|
||
and giving it a checksum. */
|
||
|
||
if (cnt > (int) 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 '$':
|
||
if (started_error_output)
|
||
{
|
||
putchar_unfiltered ('\n');
|
||
started_error_output = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
switch (ch)
|
||
{
|
||
case '+':
|
||
if (remote_debug)
|
||
printf_unfiltered("Ack\n");
|
||
return 1;
|
||
case SERIAL_TIMEOUT:
|
||
tcount ++;
|
||
if (tcount > 3)
|
||
return 0;
|
||
break; /* Retransmit buffer */
|
||
case '$':
|
||
{
|
||
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: ");
|
||
}
|
||
putchar_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. */
|
||
|
||
void
|
||
getpkt (buf, forever)
|
||
char *buf;
|
||
int forever;
|
||
{
|
||
int c;
|
||
int tries;
|
||
int timeout;
|
||
int val;
|
||
|
||
strcpy (buf,"timeout");
|
||
|
||
if (forever)
|
||
{
|
||
#ifdef MAINTENANCE_CMDS
|
||
timeout = watchdog > 0 ? watchdog : -1;
|
||
#else
|
||
timeout = -1;
|
||
#endif
|
||
}
|
||
|
||
else
|
||
timeout = remote_timeout;
|
||
|
||
#define MAX_TRIES 3
|
||
|
||
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)
|
||
{
|
||
#ifdef MAINTENANCE_CMDS
|
||
if (forever) /* Watchdog went off. Kill the target. */
|
||
{
|
||
target_mourn_inferior ();
|
||
error ("Watchdog has expired. Target detached.\n");
|
||
}
|
||
#endif
|
||
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_stdout, "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 ()
|
||
{
|
||
remote_mourn_1 (&remote_ops);
|
||
}
|
||
|
||
static void
|
||
extended_remote_mourn ()
|
||
{
|
||
/* We do _not_ want to mourn the target like this; this will
|
||
remove the extended remote target from the target stack,
|
||
and the next time the user says "run" it'll fail.
|
||
|
||
FIXME: What is the right thing to do here? */
|
||
#if 0
|
||
remote_mourn_1 (&extended_remote_ops);
|
||
#endif
|
||
}
|
||
|
||
/* Worker function for remote_mourn. */
|
||
static void
|
||
remote_mourn_1 (target)
|
||
struct target_ops *target;
|
||
{
|
||
unpush_target (target);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
/* In the extended protocol we want to be able to do things like
|
||
"run" and have them basically work as expected. So we need
|
||
a special create_inferior function.
|
||
|
||
FIXME: One day add support for changing the exec file
|
||
we're debugging, arguments and an environment. */
|
||
|
||
static void
|
||
extended_remote_create_inferior (exec_file, args, env)
|
||
char *exec_file;
|
||
char *args;
|
||
char **env;
|
||
{
|
||
/* Rip out the breakpoints; we'll reinsert them after restarting
|
||
the remote server. */
|
||
remove_breakpoints ();
|
||
|
||
/* Now restart the remote server. */
|
||
extended_remote_restart ();
|
||
|
||
/* Now put the breakpoints back in. This way we're safe if the
|
||
restart function works via a unix fork on the remote side. */
|
||
insert_breakpoints ();
|
||
|
||
/* Clean up from the last time we were running. */
|
||
clear_proceed_status ();
|
||
|
||
/* Let the remote process run. */
|
||
proceed (-1, TARGET_SIGNAL_0, 0);
|
||
}
|
||
|
||
|
||
/* On some machines, e.g. 68k, we may use a different breakpoint instruction
|
||
than other targets; in those use REMOTE_BREAKPOINT instead of just
|
||
BREAKPOINT. Also, bi-endian targets may define LITTLE_REMOTE_BREAKPOINT
|
||
and BIG_REMOTE_BREAKPOINT. If none of these are defined, we just call
|
||
the standard routines that are in mem-break.c. */
|
||
|
||
/* FIXME, these ought to be done in a more dynamic fashion. For instance,
|
||
the choice of breakpoint instruction affects target program design and
|
||
vice versa, and by making it user-tweakable, the special code here
|
||
goes away and we need fewer special GDB configurations. */
|
||
|
||
#if defined (LITTLE_REMOTE_BREAKPOINT) && defined (BIG_REMOTE_BREAKPOINT) && !defined(REMOTE_BREAKPOINT)
|
||
#define REMOTE_BREAKPOINT
|
||
#endif
|
||
|
||
#ifdef REMOTE_BREAKPOINT
|
||
|
||
/* If the target isn't bi-endian, just pretend it is. */
|
||
#if !defined (LITTLE_REMOTE_BREAKPOINT) && !defined (BIG_REMOTE_BREAKPOINT)
|
||
#define LITTLE_REMOTE_BREAKPOINT REMOTE_BREAKPOINT
|
||
#define BIG_REMOTE_BREAKPOINT REMOTE_BREAKPOINT
|
||
#endif
|
||
|
||
static unsigned char big_break_insn[] = BIG_REMOTE_BREAKPOINT;
|
||
static unsigned char little_break_insn[] = LITTLE_REMOTE_BREAKPOINT;
|
||
|
||
#endif /* 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;
|
||
{
|
||
#ifdef REMOTE_BREAKPOINT
|
||
int val;
|
||
|
||
val = target_read_memory (addr, contents_cache, sizeof big_break_insn);
|
||
|
||
if (val == 0)
|
||
{
|
||
if (TARGET_BYTE_ORDER == BIG_ENDIAN)
|
||
val = target_write_memory (addr, (char *) big_break_insn,
|
||
sizeof big_break_insn);
|
||
else
|
||
val = target_write_memory (addr, (char *) little_break_insn,
|
||
sizeof little_break_insn);
|
||
}
|
||
|
||
return val;
|
||
#else
|
||
return memory_insert_breakpoint (addr, contents_cache);
|
||
#endif /* REMOTE_BREAKPOINT */
|
||
}
|
||
|
||
static int
|
||
remote_remove_breakpoint (addr, contents_cache)
|
||
CORE_ADDR addr;
|
||
char *contents_cache;
|
||
{
|
||
#ifdef REMOTE_BREAKPOINT
|
||
return target_write_memory (addr, contents_cache, sizeof big_break_insn);
|
||
#else
|
||
return memory_remove_breakpoint (addr, contents_cache);
|
||
#endif /* REMOTE_BREAKPOINT */
|
||
}
|
||
|
||
/* Some targets are only capable of doing downloads, and afterwards they switch
|
||
to the remote serial protocol. This function provides a clean way to get
|
||
from the download target to the remote target. It's basically just a
|
||
wrapper so that we don't have to expose any of the internal workings of
|
||
remote.c.
|
||
|
||
Prior to calling this routine, you should shutdown the current target code,
|
||
else you will get the "A program is being debugged already..." message.
|
||
Usually a call to pop_target() suffices.
|
||
*/
|
||
|
||
void
|
||
push_remote_target (name, from_tty)
|
||
char *name;
|
||
int from_tty;
|
||
{
|
||
printf_filtered ("Switching to remote protocol\n");
|
||
remote_open (name, from_tty);
|
||
}
|
||
|
||
/* Other targets want to use the entire remote serial module but with
|
||
certain remote_ops overridden. */
|
||
|
||
void
|
||
open_remote_target (name, from_tty, target, extended_p)
|
||
char *name;
|
||
int from_tty;
|
||
struct target_ops *target;
|
||
int extended_p;
|
||
{
|
||
printf_filtered ("Selecting the %sremote protocol\n",
|
||
(extended_p ? "extended-" : ""));
|
||
remote_open_1 (name, from_tty, target, extended_p);
|
||
}
|
||
|
||
/* Table used by the crc32 function to calcuate the checksum. */
|
||
static unsigned long crc32_table[256] = {0, 0};
|
||
|
||
static unsigned long
|
||
crc32 (buf, len, crc)
|
||
unsigned char *buf;
|
||
int len;
|
||
unsigned int crc;
|
||
{
|
||
if (! crc32_table[1])
|
||
{
|
||
/* Initialize the CRC table and the decoding table. */
|
||
int i, j;
|
||
unsigned int c;
|
||
|
||
for (i = 0; i < 256; i++)
|
||
{
|
||
for (c = i << 24, j = 8; j > 0; --j)
|
||
c = c & 0x80000000 ? (c << 1) ^ 0x04c11db7 : (c << 1);
|
||
crc32_table[i] = c;
|
||
}
|
||
}
|
||
|
||
while (len--)
|
||
{
|
||
crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *buf) & 255];
|
||
buf++;
|
||
}
|
||
return crc;
|
||
}
|
||
|
||
/* compare-sections command
|
||
|
||
With no arguments, compares each loadable section in the exec bfd
|
||
with the same memory range on the target, and reports mismatches.
|
||
Useful for verifying the image on the target against the exec file.
|
||
Depends on the target understanding the new "qCRC:" request. */
|
||
|
||
static void
|
||
compare_sections_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
asection *s;
|
||
unsigned long host_crc, target_crc;
|
||
extern bfd *exec_bfd;
|
||
struct cleanup *old_chain;
|
||
char *tmp, *sectdata, *sectname, buf[PBUFSIZ];
|
||
bfd_size_type size;
|
||
bfd_vma lma;
|
||
int matched = 0;
|
||
int mismatched = 0;
|
||
|
||
if (!exec_bfd)
|
||
error ("command cannot be used without an exec file");
|
||
if (!current_target.to_shortname ||
|
||
strcmp (current_target.to_shortname, "remote") != 0)
|
||
error ("command can only be used with remote target");
|
||
|
||
for (s = exec_bfd->sections; s; s = s->next)
|
||
{
|
||
if (!(s->flags & SEC_LOAD))
|
||
continue; /* skip non-loadable section */
|
||
|
||
size = bfd_get_section_size_before_reloc (s);
|
||
if (size == 0)
|
||
continue; /* skip zero-length section */
|
||
|
||
sectname = (char *) bfd_get_section_name (exec_bfd, s);
|
||
if (args && strcmp (args, sectname) != 0)
|
||
continue; /* not the section selected by user */
|
||
|
||
matched = 1; /* do this section */
|
||
lma = s->lma;
|
||
/* FIXME: assumes lma can fit into long */
|
||
sprintf (buf, "qCRC:%lx,%lx", (long) lma, (long) size);
|
||
putpkt (buf);
|
||
|
||
/* be clever; compute the host_crc before waiting for target reply */
|
||
sectdata = xmalloc (size);
|
||
old_chain = make_cleanup (free, sectdata);
|
||
bfd_get_section_contents (exec_bfd, s, sectdata, 0, size);
|
||
host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff);
|
||
|
||
getpkt (buf, 0);
|
||
if (buf[0] == 'E')
|
||
error ("target memory fault, section %s, range 0x%08x -- 0x%08x",
|
||
sectname, lma, lma + size);
|
||
if (buf[0] != 'C')
|
||
error ("remote target does not support this operation");
|
||
|
||
for (target_crc = 0, tmp = &buf[1]; *tmp; tmp++)
|
||
target_crc = target_crc * 16 + fromhex (*tmp);
|
||
|
||
printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ",
|
||
sectname, lma, lma + size);
|
||
if (host_crc == target_crc)
|
||
printf_filtered ("matched.\n");
|
||
else
|
||
{
|
||
printf_filtered ("MIS-MATCHED!\n");
|
||
mismatched++;
|
||
}
|
||
|
||
do_cleanups (old_chain);
|
||
}
|
||
if (mismatched > 0)
|
||
warning ("One or more sections of the remote executable does not match\nthe loaded file\n");
|
||
if (args && !matched)
|
||
printf_filtered ("No loaded section named '%s'.\n", args);
|
||
}
|
||
|
||
static void
|
||
packet_command (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char buf[PBUFSIZ];
|
||
|
||
if (! remote_desc)
|
||
error ("command can only be used with remote target");
|
||
|
||
if (! args)
|
||
error ("remote-packet command requires packet text as argument");
|
||
|
||
puts_filtered ("sending: ");
|
||
print_packet (args);
|
||
puts_filtered ("\n");
|
||
putpkt (args);
|
||
|
||
getpkt (buf, 0);
|
||
puts_filtered ("received: ");
|
||
print_packet (buf);
|
||
puts_filtered ("\n");
|
||
}
|
||
|
||
static void
|
||
init_remote_ops ()
|
||
{
|
||
remote_ops.to_shortname = "remote";
|
||
remote_ops.to_longname = "Remote serial target in gdb-specific protocol";
|
||
remote_ops.to_doc = "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).";
|
||
remote_ops.to_open = remote_open;
|
||
remote_ops.to_close = remote_close;
|
||
remote_ops.to_detach = remote_detach;
|
||
remote_ops.to_resume = remote_resume;
|
||
remote_ops.to_wait = remote_wait;
|
||
remote_ops.to_fetch_registers = remote_fetch_registers;
|
||
remote_ops.to_store_registers = remote_store_registers;
|
||
remote_ops.to_prepare_to_store = remote_prepare_to_store;
|
||
remote_ops.to_xfer_memory = remote_xfer_memory;
|
||
remote_ops.to_files_info = remote_files_info;
|
||
remote_ops.to_insert_breakpoint = remote_insert_breakpoint;
|
||
remote_ops.to_remove_breakpoint = remote_remove_breakpoint;
|
||
remote_ops.to_kill = remote_kill;
|
||
remote_ops.to_load = generic_load;
|
||
remote_ops.to_mourn_inferior = remote_mourn;
|
||
remote_ops.to_thread_alive = remote_thread_alive;
|
||
remote_ops.to_stop = remote_stop;
|
||
remote_ops.to_stratum = process_stratum;
|
||
remote_ops.to_has_all_memory = 1;
|
||
remote_ops.to_has_memory = 1;
|
||
remote_ops.to_has_stack = 1;
|
||
remote_ops.to_has_registers = 1;
|
||
remote_ops.to_has_execution = 1;
|
||
remote_ops.to_magic = OPS_MAGIC;
|
||
}
|
||
|
||
static void
|
||
init_extended_remote_ops ()
|
||
{
|
||
extended_remote_ops = remote_ops;
|
||
|
||
extended_remote_ops.to_shortname = "extended-remote";
|
||
extended_remote_ops.to_longname = "Extended remote serial target in gdb-specific protocol";
|
||
extended_remote_ops.to_doc = "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).",
|
||
extended_remote_ops.to_open = extended_remote_open;
|
||
extended_remote_ops.to_create_inferior = extended_remote_create_inferior;
|
||
extended_remote_ops.to_mourn_inferior = extended_remote_mourn;
|
||
}
|
||
|
||
void
|
||
_initialize_remote ()
|
||
{
|
||
init_remote_ops ();
|
||
add_target (&remote_ops);
|
||
|
||
init_extended_remote_ops ();
|
||
add_target (&extended_remote_ops);
|
||
init_remote_threads();
|
||
INIT_REMOTE_THREADTESTS /* conditional thread packet unit test */
|
||
|
||
add_cmd ("compare-sections", class_obscure, compare_sections_command,
|
||
"Compare section data on target to the exec file.\n\
|
||
Argument is a single section name (default: all loaded sections).",
|
||
&cmdlist);
|
||
|
||
add_cmd ("packet", class_maintenance, packet_command,
|
||
"Send an arbitrary packet to a remote target.\n\
|
||
maintenance packet TEXT\n\
|
||
If GDB is talking to an inferior via the GDB serial protocol, then\n\
|
||
this command sends the string TEXT to the inferior, and displays the\n\
|
||
response packet. GDB supplies the initial `$' character, and the\n\
|
||
terminating `#' character and checksum.",
|
||
&maintenancelist);
|
||
|
||
add_show_from_set (add_set_cmd ("remotetimeout", no_class,
|
||
var_integer, (char *)&remote_timeout,
|
||
"Set timeout value for remote read.\n",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (add_set_cmd ("remotebreak", no_class,
|
||
var_integer, (char *)&remote_break,
|
||
"Set whether to send break if interrupted.\n",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
add_show_from_set (add_set_cmd ("remotewritesize", no_class,
|
||
var_integer, (char *)&remote_write_size,
|
||
"Set the maximum number of bytes in each memory write packet.\n",
|
||
&setlist),
|
||
&showlist);
|
||
|
||
|
||
|
||
remote_address_size = TARGET_PTR_BIT;
|
||
add_show_from_set (add_set_cmd ("remoteaddresssize", class_obscure,
|
||
var_integer, (char *)&remote_address_size,
|
||
"Set the maximum size of the address (in bits) in a memory packet.\n",
|
||
&setlist),
|
||
&showlist);
|
||
}
|
||
|