| /* Remote target communications for serial-line targets in custom GDB protocol |
| Copyright 1988, 91, 92, 93, 94, 95, 96, 97, 1998 |
| Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| /* Remote communication protocol. |
| |
| A debug packet whose contents are <data> |
| is encapsulated for transmission in the form: |
| |
| $ <data> # CSUM1 CSUM2 |
| |
| <data> must be ASCII alphanumeric and cannot include characters |
| '$' or '#'. If <data> starts with two characters followed by |
| ':', then the existing stubs interpret this as a sequence number. |
| |
| CSUM1 and CSUM2 are ascii hex representation of an 8-bit |
| checksum of <data>, the most significant nibble is sent first. |
| the hex digits 0-9,a-f are used. |
| |
| Receiver responds with: |
| |
| + - if CSUM is correct and ready for next packet |
| - - if CSUM is incorrect |
| |
| <data> is as follows: |
| Most values are encoded in ascii hex digits. Signal numbers are according |
| to the numbering in target.h. |
| |
| Request Packet |
| |
| set thread Hct... Set thread for subsequent operations. |
| c = 'c' for thread used in step and |
| continue; t... can be -1 for all |
| threads. |
| c = 'g' for thread used in other |
| operations. If zero, pick a thread, |
| any thread. |
| reply OK for success |
| ENN for an error. |
| |
| read registers g |
| reply XX....X Each byte of register data |
| is described by two hex digits. |
| Registers are in the internal order |
| for GDB, and the bytes in a register |
| are in the same order the machine uses. |
| or ENN for an error. |
| |
| write regs GXX..XX Each byte of register data |
| is described by two hex digits. |
| reply OK for success |
| ENN for an error |
| |
| write reg Pn...=r... Write register n... with value r..., |
| which contains two hex digits for each |
| byte in the register (target byte |
| order). |
| reply OK for success |
| ENN for an error |
| (not supported by all stubs). |
| |
| read mem mAA..AA,LLLL AA..AA is address, LLLL is length. |
| reply XX..XX XX..XX is mem contents |
| Can be fewer bytes than requested |
| if able to read only part of the data. |
| or ENN NN is errno |
| |
| write mem MAA..AA,LLLL:XX..XX |
| AA..AA is address, |
| LLLL is number of bytes, |
| XX..XX is data |
| reply OK for success |
| ENN for an error (this includes the case |
| where only part of the data was |
| written). |
| |
| write mem XAA..AA,LLLL:XX..XX |
| (binary) AA..AA is address, |
| LLLL is number of bytes, |
| XX..XX is binary data |
| reply OK for success |
| ENN for an error |
| |
| continue cAA..AA AA..AA is address to resume |
| If AA..AA is omitted, |
| resume at same address. |
| |
| step sAA..AA AA..AA is address to resume |
| If AA..AA is omitted, |
| resume at same address. |
| |
| continue with Csig;AA..AA Continue with signal sig (hex signal |
| signal number). If ;AA..AA is omitted, |
| resume at same address. |
| |
| step with Ssig;AA..AA Like 'C' but step not continue. |
| signal |
| |
| last signal ? Reply the current reason for stopping. |
| This is the same reply as is generated |
| for step or cont : SAA where AA is the |
| signal number. |
| |
| detach D Reply OK. |
| |
| There is no immediate reply to step or cont. |
| The reply comes when the machine stops. |
| It is SAA AA is the signal number. |
| |
| or... TAAn...:r...;n...:r...;n...:r...; |
| AA = signal number |
| n... = register number (hex) |
| r... = register contents |
| n... = `thread' |
| r... = thread process ID. This is |
| a hex integer. |
| n... = other string not starting |
| with valid hex digit. |
| gdb should ignore this n,r pair |
| and go on to the next. This way |
| we can extend the protocol. |
| or... WAA The process exited, and AA is |
| the exit status. This is only |
| applicable for certains sorts of |
| targets. |
| or... XAA The process terminated with signal |
| AA. |
| or (obsolete) NAA;tttttttt;dddddddd;bbbbbbbb |
| AA = signal number |
| tttttttt = address of symbol "_start" |
| dddddddd = base of data section |
| bbbbbbbb = base of bss section. |
| Note: only used by Cisco Systems |
| targets. The difference between this |
| reply and the "qOffsets" query is that |
| the 'N' packet may arrive spontaneously |
| whereas the 'qOffsets' is a query |
| initiated by the host debugger. |
| or... OXX..XX XX..XX is hex encoding of ASCII data. This |
| can happen at any time while the |
| program is running and the debugger |
| should continue to wait for |
| 'W', 'T', etc. |
| |
| thread alive TXX Find out if the thread XX is alive. |
| reply OK thread is still alive |
| ENN thread is dead |
| |
| remote restart RXX Restart the remote server |
| |
| extended ops ! Use the extended remote protocol. |
| Sticky -- only needs to be set once. |
| |
| kill request k |
| |
| toggle debug d toggle debug flag (see 386 & 68k stubs) |
| reset r reset -- see sparc stub. |
| reserved <other> On other requests, the stub should |
| ignore the request and send an empty |
| response ($#<checksum>). This way |
| we can extend the protocol and GDB |
| can tell whether the stub it is |
| talking to uses the old or the new. |
| search tAA:PP,MM Search backwards starting at address |
| AA for a match with pattern PP and |
| mask MM. PP and MM are 4 bytes. |
| Not supported by all stubs. |
| |
| general query qXXXX Request info about XXXX. |
| general set QXXXX=yyyy Set value of XXXX to yyyy. |
| query sect offs qOffsets Get section offsets. Reply is |
| Text=xxx;Data=yyy;Bss=zzz |
| |
| Responses can be run-length encoded to save space. A '*' means that |
| the next character is an ASCII encoding giving a repeat count which |
| stands for that many repititions of the character preceding the '*'. |
| The encoding is n+29, yielding a printable character where n >=3 |
| (which is where rle starts to win). Don't use an n > 126. |
| |
| So |
| "0* " means the same as "0000". */ |
| |
| #include "defs.h" |
| #include "gdb_string.h" |
| #include <ctype.h> |
| #include <fcntl.h> |
| #include "frame.h" |
| #include "inferior.h" |
| #include "bfd.h" |
| #include "symfile.h" |
| #include "target.h" |
| #include "wait.h" |
| /*#include "terminal.h"*/ |
| #include "gdbcmd.h" |
| #include "objfiles.h" |
| #include "gdb-stabs.h" |
| #include "gdbthread.h" |
| |
| #include "dcache.h" |
| |
| #include <ctype.h> |
| #ifdef USG |
| #include <sys/types.h> |
| #endif |
| |
| #include <signal.h> |
| #include "serial.h" |
| |
| /* Prototypes for local functions */ |
| |
| static void build_remote_gdbarch_data PARAMS ((void)); |
| |
| static int remote_write_bytes PARAMS ((CORE_ADDR memaddr, |
| char *myaddr, int len)); |
| |
| static int remote_read_bytes PARAMS ((CORE_ADDR memaddr, |
| char *myaddr, int len)); |
| |
| static void remote_files_info PARAMS ((struct target_ops *ignore)); |
| |
| static int remote_xfer_memory PARAMS ((CORE_ADDR memaddr, char * myaddr, |
| int len, int should_write, |
| struct target_ops * target)); |
| |
| static void remote_prepare_to_store PARAMS ((void)); |
| |
| static void remote_fetch_registers PARAMS ((int regno)); |
| |
| static void remote_resume PARAMS ((int pid, int step, |
| enum target_signal siggnal)); |
| |
| static int remote_start_remote PARAMS ((PTR)); |
| |
| static void remote_open PARAMS ((char *name, int from_tty)); |
| |
| static void extended_remote_open PARAMS ((char *name, int from_tty)); |
| |
| static void remote_open_1 PARAMS ((char *, int, struct target_ops *, |
| int extended_p)); |
| |
| static void remote_close PARAMS ((int quitting)); |
| |
| static void remote_store_registers PARAMS ((int regno)); |
| |
| static void remote_mourn PARAMS ((void)); |
| |
| static void extended_remote_restart PARAMS ((void)); |
| |
| static void extended_remote_mourn PARAMS ((void)); |
| |
| static void extended_remote_create_inferior PARAMS ((char *, char *, char **)); |
| |
| static void remote_mourn_1 PARAMS ((struct target_ops *)); |
| |
| static void remote_send PARAMS ((char *buf)); |
| |
| static int readchar PARAMS ((int timeout)); |
| |
| static int remote_wait PARAMS ((int pid, struct target_waitstatus * status)); |
| |
| static void remote_kill PARAMS ((void)); |
| |
| static int tohex PARAMS ((int nib)); |
| |
| static void remote_detach PARAMS ((char *args, int from_tty)); |
| |
| static void remote_interrupt PARAMS ((int signo)); |
| |
| static void remote_interrupt_twice PARAMS ((int signo)); |
| |
| static void interrupt_query PARAMS ((void)); |
| |
| static void set_thread PARAMS ((int, int)); |
| |
| static int remote_thread_alive PARAMS ((int)); |
| |
| static void get_offsets PARAMS ((void)); |
| |
| static int read_frame PARAMS ((char *)); |
| |
| static int remote_insert_breakpoint PARAMS ((CORE_ADDR, char *)); |
| |
| static int remote_remove_breakpoint PARAMS ((CORE_ADDR, char *)); |
| |
| static int hexnumlen PARAMS ((ULONGEST num)); |
| |
| static void init_remote_ops PARAMS ((void)); |
| |
| static void init_extended_remote_ops PARAMS ((void)); |
| |
| static void init_remote_cisco_ops PARAMS ((void)); |
| |
| static struct target_ops remote_cisco_ops; |
| |
| static void remote_stop PARAMS ((void)); |
| |
| static int ishex PARAMS ((int ch, int *val)); |
| |
| static int stubhex PARAMS ((int ch)); |
| |
| static int remote_query PARAMS ((int/*char*/, char *, char *, int *)); |
| |
| static int hexnumstr PARAMS ((char *, ULONGEST)); |
| |
| static CORE_ADDR remote_address_masked PARAMS ((CORE_ADDR)); |
| |
| static void print_packet PARAMS ((char *)); |
| |
| static unsigned long crc32 PARAMS ((unsigned char *, int, unsigned int)); |
| |
| static void compare_sections_command PARAMS ((char *, int)); |
| |
| static void packet_command PARAMS ((char *, int)); |
| |
| static int stub_unpack_int PARAMS ((char *buff, int fieldlength)); |
| |
| static int remote_current_thread PARAMS ((int oldpid)); |
| |
| static void remote_find_new_threads PARAMS ((void)); |
| |
| static void record_currthread PARAMS ((int currthread)); |
| |
| /* exported functions */ |
| |
| extern int fromhex PARAMS ((int a)); |
| |
| extern void getpkt PARAMS ((char *buf, int forever)); |
| |
| extern int putpkt PARAMS ((char *buf)); |
| |
| static int putpkt_binary PARAMS ((char *buf, int cnt)); |
| |
| void remote_console_output PARAMS ((char *)); |
| |
| static void check_binary_download PARAMS ((CORE_ADDR addr)); |
| |
| /* Define the target subroutine names */ |
| |
| void open_remote_target PARAMS ((char *, int, struct target_ops *, int)); |
| |
| void _initialize_remote PARAMS ((void)); |
| |
| /* */ |
| |
| static struct target_ops remote_ops; |
| |
| static struct target_ops extended_remote_ops; |
| |
| /* This was 5 seconds, which is a long time to sit and wait. |
| Unless this is going though some terminal server or multiplexer or |
| other form of hairy serial connection, I would think 2 seconds would |
| be plenty. */ |
| |
| /* Changed to allow option to set timeout value. |
| was static int remote_timeout = 2; */ |
| extern int remote_timeout; |
| |
| /* This variable chooses whether to send a ^C or a break when the user |
| requests program interruption. Although ^C is usually what remote |
| systems expect, and that is the default here, sometimes a break is |
| preferable instead. */ |
| |
| static int remote_break; |
| |
| /* Descriptor for I/O to remote machine. Initialize it to NULL so that |
| remote_open knows that we don't have a file open when the program |
| starts. */ |
| static serial_t remote_desc = NULL; |
| |
| /* This is set by the target (thru the 'S' message) |
| to denote that the target is in kernel mode. */ |
| static int cisco_kernel_mode = 0; |
| |
| /* This variable (available to the user via "set remotebinarydownload") |
| dictates whether downloads are sent in binary (via the 'X' packet). |
| We assume that the stub can, and attempt to do it. This will be cleared if |
| the stub does not understand it. This switch is still needed, though |
| in cases when the packet is supported in the stub, but the connection |
| does not allow it (i.e., 7-bit serial connection only). */ |
| static int remote_binary_download = 1; |
| |
| /* Have we already checked whether binary downloads work? */ |
| static int remote_binary_checked; |
| |
| /* Maximum number of bytes to read/write at once. The value here |
| is chosen to fill up a packet (the headers account for the 32). */ |
| #define MAXBUFBYTES(N) (((N)-32)/2) |
| |
| /* Having this larger than 400 causes us to be incompatible with m68k-stub.c |
| and i386-stub.c. Normally, no one would notice because it only matters |
| for writing large chunks of memory (e.g. in downloads). Also, this needs |
| to be more than 400 if required to hold the registers (see below, where |
| we round it up based on REGISTER_BYTES). */ |
| /* Round up PBUFSIZ to hold all the registers, at least. */ |
| #define PBUFSIZ ((REGISTER_BYTES > MAXBUFBYTES (400)) \ |
| ? (REGISTER_BYTES * 2 + 32) \ |
| : 400) |
| |
| |
| /* This variable sets the number of bytes to be written to the target |
| in a single packet. Normally PBUFSIZ is satisfactory, but some |
| targets need smaller values (perhaps because the receiving end |
| is slow). */ |
| |
| static int remote_write_size; |
| |
| /* 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 |
| 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. */ |
| |
| static int remote_address_size; |
| |
| /* This is the size (in chars) of the first response to the `g' command. This |
| 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. */ |
| |
| static int remote_register_buf_size = 0; |
| |
| /* 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)); |
| |
| |
| |
| /* These are the threads which we last sent to the remote system. |
| -1 for all or -2 for not sent yet. */ |
| static int general_thread; |
| static int continue_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; |
| { |
| general_thread = currthread; |
| |
| /* If this is a new thread, add it to GDB's thread list. |
| If we leave it up to WFI to do this, bad things will happen. */ |
| if (!in_thread_list (currthread)) |
| { |
| add_thread (currthread); |
| printf_filtered ("[New %s]\n", target_pid_to_str (currthread)); |
| } |
| } |
| |
| #define MAGIC_NULL_PID 42000 |
| |
| static void |
| set_thread (th, gen) |
| int th; |
| int gen; |
| { |
| char *buf = alloca (PBUFSIZ); |
| int state = gen ? general_thread : continue_thread; |
| |
| if (state == th) |
| return; |
| |
| buf[0] = 'H'; |
| buf[1] = gen ? 'g' : 'c'; |
| if (th == MAGIC_NULL_PID) |
| { |
| 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 |
| continue_thread = th; |
| } |
| |
| /* Return nonzero if the thread TH is still alive on the remote system. */ |
| |
| static int |
| remote_thread_alive (tid) |
| int tid; |
| { |
| char buf[16]; |
| |
| if (tid < 0) |
| sprintf (buf, "T-%08x", -tid); |
| else |
| sprintf (buf, "T%08x", tid); |
| 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 OPAQUETHREADBYTES 8 |
| |
| /* a 64 bit opaque identifier */ |
| typedef unsigned char threadref[OPAQUETHREADBYTES]; |
| |
| /* WARNING: This threadref data structure comes from the remote O.S., libstub |
| protocol encoding, and remote.c. it is not particularly changable */ |
| |
| /* Right now, the internal structure is int. We want it to be bigger. |
| Plan to fix this. |
| */ |
| |
| typedef int gdb_threadref; /* internal GDB thread reference */ |
| |
| /* gdb_ext_thread_info is an internal GDB data structure which is |
| equivalint to the reply of the remote threadinfo packet */ |
| |
| struct gdb_ext_thread_info |
| { |
| threadref threadid; /* External form of thread reference */ |
| int active; /* Has state interesting to GDB? , regs, stack */ |
| char display[256]; /* Brief state display, name, blocked/syspended */ |
| char shortname[32]; /* To be used to name threads */ |
| char more_display[256]; /* Long info, statistics, queue depth, whatever */ |
| }; |
| |
| /* The volume of remote transfers can be limited by submitting |
| a mask containing bits specifying the desired information. |
| Use a union of these values as the 'selection' parameter to |
| get_thread_info. FIXME: Make these TAG names more thread specific. |
| */ |
| |
| #define TAG_THREADID 1 |
| #define TAG_EXISTS 2 |
| #define TAG_DISPLAY 4 |
| #define TAG_THREADNAME 8 |
| #define TAG_MOREDISPLAY 16 |
| |
| #define BUF_THREAD_ID_SIZE (OPAQUETHREADBYTES*2) |
| |
| char *unpack_varlen_hex PARAMS ((char *buff, int *result)); |
| |
| static char *unpack_nibble PARAMS ((char *buf, int *val)); |
| |
| static char *pack_nibble PARAMS ((char *buf, int nibble)); |
| |
| static char *pack_hex_byte PARAMS ((char *pkt, int/*unsigned char*/ byte)); |
| |
| static char *unpack_byte PARAMS ((char *buf, int *value)); |
| |
| static char *pack_int PARAMS ((char *buf, int value)); |
| |
| static char *unpack_int PARAMS ((char *buf, int *value)); |
| |
| 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)); |
| |
| static 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)); |
| |
| |
| static int remote_get_threadinfo PARAMS ((threadref *threadid, |
| int fieldset, /*TAG mask */ |
| struct gdb_ext_thread_info *info)); |
| |
| static 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)); |
| |
| typedef int (*rmt_thread_action) (threadref *ref, void *context); |
| |
| static int remote_threadlist_iterator PARAMS ((rmt_thread_action stepfunction, |
| void *context, int looplimit)); |
| |
| static int remote_newthread_step PARAMS ((threadref *ref, void *context)); |
| |
| /* encode 64 bits in 16 chars of hex */ |
| |
| static const char hexchars[] = "0123456789abcdef"; |
| |
| static int |
| ishex (ch, val) |
| int 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) |
| int 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 nibble; |
| int retval = 0; |
| |
| 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 = 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; |
| int 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; |
| } |
| |
| #if 0 /* currently unused, uncomment when needed */ |
| static char *pack_string PARAMS ((char *pkt, char *string)); |
| |
| 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; |
| } |
| #endif /* 0 (unused) */ |
| |
| 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); |
| } |
| |
| static int |
| threadref_to_int (ref) |
| threadref *ref; |
| { |
| int i, value = 0; |
| unsigned char *scan; |
| |
| 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; |
| } |
| |
| /* |
| 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 (pkt, mode, id) |
| char *pkt; |
| int mode; |
| threadref *id; |
| { |
| *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 */ |
| 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 /* Is 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; |
| |
| /* 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; |
| } |
| |
| static int |
| remote_get_threadinfo (threadid, fieldset, info) |
| threadref *threadid; |
| int fieldset; /* TAG mask */ |
| struct gdb_ext_thread_info *info; |
| { |
| int result; |
| char *threadinfo_pkt = alloca (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; |
| } |
| |
| /* Unfortunately, 61 bit thread-ids are bigger than the internal |
| representation of a threadid. */ |
| |
| static 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); |
| } |
| |
| /* 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; |
| } |
| |
| /* 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. */ |
| 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; |
| } |
| |
| 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 = alloca (PBUFSIZ); |
| char *t_response = alloca (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, 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 retrieves 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. */ |
| |
| |
| /* About this many threadisds fit in a packet. */ |
| |
| #define MAXTHREADLISTRESULTS 32 |
| |
| 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 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; |
| } |
| /* clear for later iterations */ |
| startflag = 0; |
| /* Setup to resume next batch of thread references, set nextthread. */ |
| if (result_count >= 1) |
| copy_threadref (&nextthread, &resultthreadlist[result_count - 1]); |
| 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 |
| |
| static int |
| remote_current_thread (oldpid) |
| int oldpid; |
| { |
| char *buf = alloca (PBUFSIZ); |
| |
| putpkt ("qC"); |
| getpkt (buf, 0); |
| if (buf[0] == 'Q' && buf[1] == 'C') |
| return strtol (&buf[2], NULL, 16); |
| else |
| return oldpid; |
| } |
| |
| /* Find new threads for info threads command. */ |
| |
| static void |
| remote_find_new_threads () |
| { |
| remote_threadlist_iterator (remote_newthread_step, 0, |
| CRAZY_MAX_THREADS); |
| if (inferior_pid == MAGIC_NULL_PID) /* ack ack ack */ |
| inferior_pid = remote_current_thread (inferior_pid); |
| } |
| |
| static void |
| remote_threads_info (void) |
| { |
| char *buf = alloca (PBUFSIZ); |
| char *bufp; |
| int tid; |
| |
| if (remote_desc == 0) /* paranoia */ |
| error ("Command can only be used when connected to the remote target."); |
| |
| putpkt ("qfThreadInfo"); |
| getpkt (bufp = buf, 0); |
| if (bufp[0] == '\0') /* q packet not recognized! */ |
| { /* try old jmetzler method */ |
| remote_find_new_threads (); |
| return; |
| } |
| else /* try new 'q' method */ |
| while (*bufp++ == 'm') /* reply contains one or more TID */ |
| { |
| do { |
| tid = strtol(bufp, &bufp, 16); |
| if (tid != 0 && !in_thread_list (tid)) |
| add_thread (tid); |
| } while (*bufp++ == ','); /* comma-separated list */ |
| putpkt ("qsThreadInfo"); |
| getpkt (bufp = buf, 0); |
| } |
| } |
| |
| |
| /* Restart the remote side; this is an extended protocol operation. */ |
| |
| static void |
| extended_remote_restart () |
| { |
| char *buf = alloca (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 = alloca (PBUFSIZ); |
| char *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 = 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); |
| } |
| |
| /* |
| * Cisco version of section offsets: |
| * |
| * Instead of having GDB query the target for the section offsets, |
| * Cisco lets the target volunteer the information! It's also in |
| * a different format, so here are the functions that will decode |
| * a section offset packet from a Cisco target. |
| */ |
| |
| /* |
| * Function: remote_cisco_section_offsets |
| * |
| * Returns: zero for success, non-zero for failure |
| */ |
| |
| static int |
| remote_cisco_section_offsets (text_addr, data_addr, bss_addr, |
| text_offs, data_offs, bss_offs) |
| bfd_vma text_addr; |
| bfd_vma data_addr; |
| bfd_vma bss_addr; |
| bfd_signed_vma * text_offs; |
| bfd_signed_vma * data_offs; |
| bfd_signed_vma * bss_offs; |
| { |
| bfd_vma text_base, data_base, bss_base; |
| struct minimal_symbol *start; |
| asection *sect; |
| bfd * abfd; |
| int len; |
| char *p; |
| |
| if (symfile_objfile == NULL) |
| return -1; /* no can do nothin' */ |
| |
| start = lookup_minimal_symbol ("_start", NULL, NULL); |
| if (start == NULL) |
| return -1; /* Can't find "_start" symbol */ |
| |
| data_base = bss_base = 0; |
| text_base = SYMBOL_VALUE_ADDRESS (start); |
| |
| abfd = symfile_objfile->obfd; |
| for (sect = abfd->sections; |
| sect != 0; |
| sect = sect->next) |
| { |
| p = (unsigned char *) bfd_get_section_name (abfd, sect); |
| len = strlen (p); |
| if (strcmp (p + len - 4, "data") == 0) /* ends in "data" */ |
| if (data_base == 0 || |
| data_base > bfd_get_section_vma (abfd, sect)) |
| data_base = bfd_get_section_vma (abfd, sect); |
| if (strcmp (p + len - 3, "bss") == 0) /* ends in "bss" */ |
| if (bss_base == 0 || |
| bss_base > bfd_get_section_vma (abfd, sect)) |
| bss_base = bfd_get_section_vma (abfd, sect); |
| } |
| *text_offs = text_addr - text_base; |
| *data_offs = data_addr - data_base; |
| *bss_offs = bss_addr - bss_base; |
| if (remote_debug) |
| { |
| char tmp[128]; |
| |
| sprintf (tmp, "VMA: text = 0x"); |
| sprintf_vma (tmp + strlen (tmp), text_addr); |
| sprintf (tmp + strlen (tmp), " data = 0x"); |
| sprintf_vma (tmp + strlen (tmp), data_addr); |
| sprintf (tmp + strlen (tmp), " bss = 0x"); |
| sprintf_vma (tmp + strlen (tmp), bss_addr); |
| fprintf_filtered (gdb_stdlog, tmp); |
| fprintf_filtered (gdb_stdlog, |
| "Reloc offset: text = 0x%x data = 0x%x bss = 0x%x\n", |
| (long) *text_offs, (long) *data_offs, (long) *bss_offs); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Function: remote_cisco_objfile_relocate |
| * |
| * Relocate the symbol file for a remote target. |
| */ |
| |
| static void |
| remote_cisco_objfile_relocate (text_off, data_off, bss_off) |
| bfd_signed_vma text_off; |
| bfd_signed_vma data_off; |
| bfd_signed_vma bss_off; |
| { |
| struct section_offsets *offs; |
| |
| if (text_off != 0 || data_off != 0 || bss_off != 0) |
| { |
| /* FIXME: This code assumes gdb-stabs.h is being used; it's |
| broken for xcoff, dwarf, sdb-coff, etc. But there is no |
| simple canonical representation for this stuff. */ |
| |
| 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_off; |
| ANOFFSET (offs, SECT_OFF_DATA) = data_off; |
| ANOFFSET (offs, SECT_OFF_BSS) = bss_off; |
| |
| /* First call the standard objfile_relocate. */ |
| objfile_relocate (symfile_objfile, offs); |
| |
| /* Now we need to fix up the section entries already attached to |
| the exec target. These entries will control memory transfers |
| from the exec file. */ |
| |
| exec_set_section_offsets (text_off, data_off, bss_off); |
| } |
| } |
| |
| /* Stub for catch_errors. */ |
| |
| static int |
| remote_start_remote_dummy (dummy) |
| char *dummy; |
| { |
| start_remote (); /* Initialize gdb process mechanisms */ |
| return 1; |
| } |
| |
| static int |
| remote_start_remote (dummy) |
| PTR 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); |
| |
| inferior_pid = remote_current_thread (inferior_pid); |
| |
| get_offsets (); /* Get text, data & bss offsets */ |
| |
| putpkt ("?"); /* initiate a query from remote machine */ |
| immediate_quit = 0; |
| |
| return remote_start_remote_dummy (dummy); |
| } |
| |
| /* 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\n\ |
| serial 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 */ |
| |
| /* 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; |
| continue_thread = -2; |
| |
| /* Force remote_write_bytes to check whether target supports |
| binary downloading. */ |
| remote_binary_checked = 0; |
| |
| /* 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 = MAGIC_NULL_PID; |
| /* 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, NULL, |
| "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 = alloca (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 = alloca (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; |
| |
| static int last_sent_step; |
| |
| static void |
| remote_resume (pid, step, siggnal) |
| int pid, step; |
| enum target_signal siggnal; |
| { |
| char *buf = alloca (PBUFSIZ); |
| |
| if (pid == -1) |
| set_thread (0, 0); /* run any thread */ |
| else |
| set_thread (pid, 0); /* run this thread */ |
| |
| 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)); |
| |
| /* The command line interface's stop routine. This function is installed |
| as a signal handler for SIGINT. The first time a user requests a |
| stop, we call remote_stop to send a break or ^C. If there is no |
| response from the target (it didn't stop when the user requested it), |
| we ask the user if he'd like to detach from the target. */ |
| static void |
| remote_interrupt (signo) |
| int signo; |
| { |
| /* If this doesn't work, try more severe steps. */ |
| signal (signo, remote_interrupt_twice); |
| |
| if (remote_debug) |
| fprintf_unfiltered (gdb_stdlog, "remote_interrupt called\n"); |
| |
| target_stop (); |
| } |
| |
| /* The user typed ^C twice. */ |
| |
| static void |
| remote_interrupt_twice (signo) |
| int signo; |
| { |
| signal (signo, ofunc); |
| interrupt_query (); |
| signal (signo, remote_interrupt); |
| } |
| |
| /* This is the generic stop called via the target vector. When a target |
| interrupt is requested, either by the command line or the GUI, we |
| will eventually end up here. */ |
| static void |
| remote_stop () |
| { |
| /* Send a break or a ^C, depending on user preference. */ |
| if (remote_debug) |
| fprintf_unfiltered (gdb_stdlog, "remote_stop called\n"); |
| |
| if (remote_break) |
| SERIAL_SEND_BREAK (remote_desc); |
| else |
| SERIAL_WRITE (remote_desc, "\003", 1); |
| } |
| |
| /* 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", which in the case of a multi-threaded |
| remote OS, is the thread-id. */ |
| |
| static int |
| remote_wait (pid, status) |
| int pid; |
| struct target_waitstatus *status; |
| { |
| unsigned char *buf = alloca (PBUFSIZ); |
| int thread_num = -1; |
| |
| status->kind = TARGET_WAITKIND_EXITED; |
| status->value.integer = 0; |
| |
| while (1) |
| { |
| unsigned char *p; |
| |
| 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; |
| |
| /* Read the register number */ |
| regno = strtol ((const char *) p, &p_temp, 16); |
| 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]))); |
| |
| if (buf[3] == 'p') |
| { |
| /* Export Cisco kernel mode as a convenience variable |
| (so that it can be used in the GDB prompt if desired). */ |
| |
| if (cisco_kernel_mode == 1) |
| set_internalvar (lookup_internalvar ("cisco_kernel_mode"), |
| value_from_string ("PDEBUG-")); |
| cisco_kernel_mode = 0; |
| thread_num = strtol ((const char *) &buf[4], NULL, 16); |
| record_currthread (thread_num); |
| } |
| else if (buf[3] == 'k') |
| { |
| /* Export Cisco kernel mode as a convenience variable |
| (so that it can be used in the GDB prompt if desired). */ |
| |
| if (cisco_kernel_mode == 1) |
| set_internalvar (lookup_internalvar ("cisco_kernel_mode"), |
| value_from_string ("KDEBUG-")); |
| cisco_kernel_mode = 1; |
| } |
| goto got_status; |
| case 'N': /* Cisco special: status and offsets */ |
| { |
| bfd_vma text_addr, data_addr, bss_addr; |
| bfd_signed_vma text_off, data_off, bss_off; |
| unsigned char *p1; |
| |
| status->kind = TARGET_WAITKIND_STOPPED; |
| status->value.sig = (enum target_signal) |
| (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); |
| |
| if (symfile_objfile == NULL) |
| { |
| warning ("Relocation packet recieved with no symbol file. \ |
| Packet Dropped"); |
| goto got_status; |
| } |
| |
| /* Relocate object file. Buffer format is NAATT;DD;BB |
| * where AA is the signal number, TT is the new text |
| * address, DD * is the new data address, and BB is the |
| * new bss address. */ |
| |
| p = &buf[3]; |
| text_addr = strtoul (p, (char **) &p1, 16); |
| if (p1 == p || *p1 != ';') |
| warning ("Malformed relocation packet: Packet '%s'", buf); |
| p = p1 + 1; |
| data_addr = strtoul (p, (char **) &p1, 16); |
| if (p1 == p || *p1 != ';') |
| warning ("Malformed relocation packet: Packet '%s'", buf); |
| p = p1 + 1; |
| bss_addr = strtoul (p, (char **) &p1, 16); |
| if (p1 == p) |
| warning ("Malformed relocation packet: Packet '%s'", buf); |
| |
| if (remote_cisco_section_offsets (text_addr, data_addr, bss_addr, |
| &text_off, &data_off, &bss_off) |
| == 0) |
| if (text_off != 0 || data_off != 0 || bss_off != 0) |
| remote_cisco_objfile_relocate (text_off, data_off, bss_off); |
| |
| 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) |
| { |
| 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 = alloca (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) |
| fprintf_unfiltered (gdb_stdlog, |
| "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 = alloca (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; |
| } |
| |
| /* Determine whether the remote target supports binary downloading. |
| This is accomplished by sending a no-op memory write of zero length |
| to the target at the specified address. It does not suffice to send |
| the whole packet, since many stubs strip the eighth bit and subsequently |
| compute a wrong checksum, which causes real havoc with remote_write_bytes. |
| |
| NOTE: This can still lose if the serial line is not eight-bit clean. In |
| cases like this, the user should clear "remotebinarydownload". */ |
| static void |
| check_binary_download (addr) |
| CORE_ADDR addr; |
| { |
| if (remote_binary_download && !remote_binary_checked) |
| { |
| char *buf = alloca (PBUFSIZ); |
| char *p; |
| remote_binary_checked = 1; |
| |
| p = buf; |
| *p++ = 'X'; |
| p += hexnumstr (p, (ULONGEST) addr); |
| *p++ = ','; |
| p += hexnumstr (p, (ULONGEST) 0); |
| *p++ = ':'; |
| *p = '\0'; |
| |
| putpkt_binary (buf, (int) (p - buf)); |
| getpkt (buf, 0); |
| |
| if (buf[0] == '\0') |
| remote_binary_download = 0; |
| } |
| |
| if (remote_debug) |
| { |
| if (remote_binary_download) |
| fprintf_unfiltered (gdb_stdlog, |
| "binary downloading suppported by target\n"); |
| else |
| fprintf_unfiltered (gdb_stdlog, |
| "binary downloading NOT suppported by target\n"); |
| } |
| } |
| |
| /* 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; |
| { |
| unsigned char *buf = alloca (PBUFSIZ); |
| int max_buf_size; /* Max size of packet output buffer */ |
| int origlen; |
| |
| /* Verify that the target can support a binary download */ |
| check_binary_download (memaddr); |
| |
| /* 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 - $M<memaddr>,<len>:#nn */ |
| max_buf_size -= 2 + hexnumlen (memaddr + len - 1) + 1 + hexnumlen (len) + 4; |
| |
| origlen = len; |
| while (len > 0) |
| { |
| unsigned char *p, *plen; |
| int todo; |
| int i; |
| |
| /* construct "M"<memaddr>","<len>":" */ |
| /* sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo); */ |
| memaddr = remote_address_masked (memaddr); |
| p = buf; |
| if (remote_binary_download) |
| { |
| *p++ = 'X'; |
| todo = min (len, max_buf_size); |
| } |
| else |
| { |
| *p++ = 'M'; |
| todo = min (len, max_buf_size / 2); /* num bytes that will fit */ |
| } |
| |
| p += hexnumstr (p, (ULONGEST) memaddr); |
| *p++ = ','; |
| |
| plen = p; /* remember where len field goes */ |
| p += hexnumstr (p, (ULONGEST) todo); |
| *p++ = ':'; |
| *p = '\0'; |
| |
| /* We send target system values byte by byte, in increasing byte |
| addresses, each byte encoded as two hex characters (or one |
| binary character). */ |
| if (remote_binary_download) |
| { |
| int escaped = 0; |
| for (i = 0; |
| (i < todo) && (i + escaped) < (max_buf_size - 2); |
| i++) |
| { |
| switch (myaddr[i] & 0xff) |
| { |
| case '$': |
| case '#': |
| case 0x7d: |
| /* These must be escaped */ |
| escaped++; |
| *p++ = 0x7d; |
| *p++ = (myaddr[i] & 0xff) ^ 0x20; |
| break; |
| default: |
| *p++ = myaddr[i] & 0xff; |
| break; |
| } |
| } |
| |
| if (i < todo) |
| { |
| /* Escape chars have filled up the buffer prematurely, |
| and we have actually sent fewer bytes than planned. |
| Fix-up the length field of the packet. */ |
| |
| /* FIXME: will fail if new len is a shorter string than |
| old len. */ |
| |
| plen += hexnumstr (plen, (ULONGEST) i); |
| *plen++ = ':'; |
| } |
| } |
| else |
| { |
| for (i = 0; i < todo; i++) |
| { |
| *p++ = tohex ((myaddr[i] >> 4) & 0xf); |
| *p++ = tohex (myaddr[i] & 0xf); |
| } |
| *p = '\0'; |
| } |
| |
| putpkt_binary (buf, (int) (p - 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; |
| } |
| |
| /* Increment by i, not by todo, in case escape chars |
| caused us to send fewer bytes than we'd planned. */ |
| myaddr += i; |
| memaddr += i; |
| len -= i; |
| } |
| 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; |
| { |
| char *buf = alloca (PBUFSIZ); |
| 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 *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 BUFFER. Write to inferior if |
| SHOULD_WRITE is nonzero. Returns length of data written or read; 0 |
| for error. */ |
| |
| #ifndef REMOTE_TRANSLATE_XFER_ADDRESS |
| #define REMOTE_TRANSLATE_XFER_ADDRESS(MEM_ADDR, MEM_LEN, TARG_ADDR, TARG_LEN) \ |
| (*(TARG_ADDR) = (MEM_ADDR), *(TARG_LEN) = (MEM_LEN)) |
| #endif |
| |
| /* ARGSUSED */ |
| static int |
| remote_xfer_memory (mem_addr, buffer, mem_len, should_write, target) |
| CORE_ADDR mem_addr; |
| char *buffer; |
| int mem_len; |
| int should_write; |
| struct target_ops *target; /* ignored */ |
| { |
| CORE_ADDR targ_addr; |
| int targ_len; |
| REMOTE_TRANSLATE_XFER_ADDRESS (mem_addr, mem_len, &targ_addr, &targ_len); |
| if (targ_len <= 0) |
| return 0; |
| |
| return dcache_xfer_memory (remote_dcache, targ_addr, buffer, |
| targ_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 = alloca (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 ("\""); |
| } |
| |
| int |
| putpkt (buf) |
| char *buf; |
| { |
| return putpkt_binary (buf, strlen (buf)); |
| } |
| |
| /* Send a packet to the remote machine, with error checking. The data |
| of the packet is in BUF. The string in BUF can be at most PBUFSIZ - 5 |
| to account for the $, # and checksum, and for a possible /0 if we are |
| debugging (remote_debug) and want to print the sent packet as a string */ |
| |
| static int |
| putpkt_binary (buf, cnt) |
| char *buf; |
| int cnt; |
| { |
| int i; |
| unsigned char csum = 0; |
| char *buf2 = alloca (PBUFSIZ); |
| char *junkbuf = alloca (PBUFSIZ); |
| |
| int ch; |
| int tcount = 0; |
| char *p; |
| |
| /* Copy the packet into buffer BUF2, encapsulating it |
| and giving it a checksum. */ |
| |
| if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */ |
| abort (); |
| |
| p = buf2; |
| *p++ = '$'; |
| |
| 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'; |
| fprintf_unfiltered (gdb_stdlog, "Sending packet: %s...", buf2); |
| gdb_flush (gdb_stdlog); |
| } |
| 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 '$': |
| if (started_error_output) |
| { |
| putchar_unfiltered ('\n'); |
| started_error_output = 0; |
| } |
| } |
| } |
| |
| switch (ch) |
| { |
| case '+': |
| if (remote_debug) |
| fprintf_unfiltered (gdb_stdlog, "Ack\n"); |
| return 1; |
| case SERIAL_TIMEOUT: |
| tcount ++; |
| if (tcount > 3) |
| return 0; |
| break; /* Retransmit buffer */ |
| case '$': |
| { |
| /* 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; |
| fprintf_unfiltered (gdb_stdlog, "putpkt: Junk: "); |
| } |
| fputc_unfiltered (ch & 0177, gdb_stdlog); |
| } |
| 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 |
| } |
| } |
| |
| static int remote_cisco_mode; |
| |
| static void remote_cisco_expand (src, dest) |
| char *src; |
| char *dest; |
| { |
| int i; |
| int repeat; |
| |
| do { |
| if (*src == '*') |
| { |
| repeat = (fromhex (src[1]) << 4) + fromhex (src[2]); |
| for (i = 0; i < repeat; i++) |
| { |
| *dest++ = *(src-1); |
| } |
| src += 2; |
| } |
| else |
| { |
| *dest++ = *src; |
| } |
| } while (*src++); |
| } |
| |
| /* 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) |
| fputs_filtered ("Timeout in mid-packet, retrying\n", gdb_stdlog); |
| return 0; |
| case '$': |
| if (remote_debug) |
| fputs_filtered ("Saw new packet start in middle of old one\n", |
| gdb_stdlog); |
| 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) |
| { |
| if (remote_cisco_mode) /* variant run-length-encoding */ |
| { |
| char *tmp_buf = alloca (PBUFSIZ); |
| |
| remote_cisco_expand (buf, tmp_buf); |
| strcpy (buf, tmp_buf); |
| } |
| return 1; |
| } |
| |
| if (remote_debug) |
| { |
| fprintf_filtered (gdb_stdlog, |
| "Bad checksum, sentsum=0x%x, csum=0x%x, buf=", |
| pktcsum, csum); |
| fputs_filtered (buf, gdb_stdlog); |
| fputs_filtered ("\n", gdb_stdlog); |
| } |
| return 0; |
| } |
| case '*': /* Run length encoding */ |
| if (remote_cisco_mode == 0) /* variant 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; |
| } |
| /* else fall thru to treat like default */ |
| 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) |
| { |
| timeout = watchdog > 0 ? watchdog : -1; |
| } |
| |
| 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) |
| { |
| if (forever) /* Watchdog went off. Kill the target. */ |
| { |
| target_mourn_inferior (); |
| error ("Watchdog has expired. Target detached.\n"); |
| } |
| if (remote_debug) |
| fputs_filtered ("Timed out.\n", gdb_stdlog); |
| 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_stdlog, "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 ((catch_errors_ftype*) 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; |
| char *sectdata; |
| char *sectname; |
| char *buf = alloca (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\n\ |
| the loaded file\n"); |
| if (args && !matched) |
| printf_filtered ("No loaded section named '%s'.\n", args); |
| } |
| |
| static int |
| remote_query (query_type, buf, outbuf, bufsiz) |
| int query_type; |
| char *buf; |
| char *outbuf; |
| int *bufsiz; |
| { |
| int i; |
| char *buf2 = alloca (PBUFSIZ); |
| char *p2 = &buf2[0]; |
| char *p = buf; |
| |
| if (! bufsiz) |
| error ("null pointer to remote bufer size specified"); |
| |
| /* minimum outbuf size is PBUFSIZ - if bufsiz is not large enough let |
| the caller know and return what the minimum size is */ |
| /* Note: a zero bufsiz can be used to query the minimum buffer size */ |
| if ( *bufsiz < PBUFSIZ ) |
| { |
| *bufsiz = PBUFSIZ; |
| return -1; |
| } |
| |
| /* except for querying the minimum buffer size, target must be open */ |
| if (! remote_desc) |
| error ("remote query is only available after target open"); |
| |
| /* we only take uppercase letters as query types, at least for now */ |
| if ( (query_type < 'A') || (query_type > 'Z') ) |
| error ("invalid remote query type"); |
| |
| if (! buf) |
| error ("null remote query specified"); |
| |
| if (! outbuf) |
| error ("remote query requires a buffer to receive data"); |
| |
| outbuf[0] = '\0'; |
| |
| *p2++ = 'q'; |
| *p2++ = query_type; |
| |
| /* we used one buffer char for the remote protocol q command and another |
| for the query type. As the remote protocol encapsulation uses 4 chars |
| plus one extra in case we are debugging (remote_debug), |
| we have PBUFZIZ - 7 left to pack the query string */ |
| i = 0; |
| while ( buf[i] && (i < (PBUFSIZ - 8)) ) |
| { |
| /* bad caller may have sent forbidden characters */ |
| if ( (!isprint(buf[i])) || (buf[i] == '$') || (buf[i] == '#') ) |
| error ("illegal characters in query string"); |
| |
| *p2++ = buf[i]; |
| i++; |
| } |
| *p2 = buf[i]; |
| |
| if ( buf[i] ) |
| error ("query larger than available buffer"); |
| |
| i = putpkt (buf2); |
| if ( i < 0 ) return i; |
| |
| getpkt (outbuf, 0); |
| |
| return 0; |
| } |
| |
| static void |
| packet_command (args, from_tty) |
| char *args; |
| int from_tty; |
| { |
| char *buf = alloca (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"); |
| } |
| |
| #if 0 |
| /* --------- UNIT_TEST for THREAD oriented PACKETS ------------------------- */ |
| |
| static void display_thread_info PARAMS ((struct gdb_ext_thread_info *info)); |
| |
| static void threadset_test_cmd PARAMS ((char *cmd, int tty)); |
| |
| static void threadalive_test PARAMS ((char *cmd, int tty)); |
| |
| static void threadlist_test_cmd PARAMS ((char *cmd, int tty)); |
| |
| 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)); |
| |
| #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); |
| printf_filtered ("Name: %s\n ", info->shortname); |
| printf_filtered ("State: %s\n", info->display); |
| 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 "); |
| } |
| |
| #endif /* 0 */ |
| |
| 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_find_new_threads = remote_threads_info; |
| remote_ops.to_stop = remote_stop; |
| remote_ops.to_query = remote_query; |
| 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_has_thread_control = tc_schedlock; /* can lock scheduler */ |
| remote_ops.to_magic = OPS_MAGIC; |
| } |
| |
| /* Set up the extended remote vector by making a copy of the standard |
| remote vector and adding to it. */ |
| |
| 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; |
| } |
| |
| /* |
| * Command: info remote-process |
| * |
| * This implements Cisco's version of the "info proc" command. |
| * |
| * This query allows the target stub to return an arbitrary string |
| * (or strings) giving arbitrary information about the target process. |
| * This is optional; the target stub isn't required to implement it. |
| * |
| * Syntax: qfProcessInfo request first string |
| * qsProcessInfo request subsequent string |
| * reply: 'O'<hex-encoded-string> |
| * 'l' last reply (empty) |
| */ |
| |
| static void |
| remote_info_process (args, from_tty) |
| char *args; |
| int from_tty; |
| { |
| char *buf = alloca (PBUFSIZ); |
| |
| if (remote_desc == 0) |
| error ("Command can only be used when connected to the remote target."); |
| |
| putpkt ("qfProcessInfo"); |
| getpkt (buf, 0); |
| if (buf[0] == 0) |
| return; /* Silently: target does not support this feature. */ |
| |
| if (buf[0] == 'E') |
| error ("info proc: target error."); |
| |
| while (buf[0] == 'O') /* Capitol-O packet */ |
| { |
| remote_console_output (&buf[1]); |
| putpkt ("qsProcessInfo"); |
| getpkt (buf, 0); |
| } |
| } |
| |
| /* |
| * Target Cisco |
| */ |
| |
| static void |
| remote_cisco_open (name, from_tty) |
| char *name; |
| int from_tty; |
| { |
| if (name == 0) |
| error ( |
| "To open a remote debug connection, you need to specify what \n\ |
| device is attached to the remote system (e.g. host:port)."); |
| |
| target_preopen (from_tty); |
| |
| unpush_target (&remote_cisco_ops); |
| |
| remote_dcache = dcache_init (remote_read_bytes, remote_write_bytes); |
| |
| remote_desc = SERIAL_OPEN (name); |
| if (!remote_desc) |
| perror_with_name (name); |
| |
| /* |
| * If a baud rate was specified on the gdb command line it will |
| * be greater than the initial value of -1. If it is, use it otherwise |
| * default to 9600 |
| */ |
| |
| baud_rate = (baud_rate > 0) ? baud_rate : 9600; |
| 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"); |
| } |
| |
| remote_cisco_mode = 1; |
| |
| push_target (&remote_cisco_ops); /* Switch to using cisco target now */ |
| |
| /* Start out by trying the 'P' request to set registers. We set this each |
| time that we open a new target so that if the user switches from one |
| stub to another, we can (if the target is closed and reopened) cope. */ |
| stub_supports_P = 1; |
| |
| general_thread = -2; |
| continue_thread = -2; |
| |
| /* Force remote_write_bytes to check whether target supports |
| binary downloading. */ |
| remote_binary_checked = 0; |
| |
| /* 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 = MAGIC_NULL_PID; |
| |
| /* Start the remote connection; if error (0), discard this target. */ |
| |
| if (!catch_errors (remote_start_remote_dummy, (char *) 0, |
| "Couldn't establish connection to remote target\n", |
| RETURN_MASK_ALL)) |
| { |
| pop_target (); |
| return; |
| } |
| } |
| |
| static void |
| remote_cisco_close (quitting) |
| int quitting; |
| { |
| remote_cisco_mode = 0; |
| remote_close (quitting); |
| } |
| |
| static void |
| remote_cisco_mourn PARAMS ((void)) |
| { |
| remote_mourn_1 (&remote_cisco_ops); |
| } |
| |
| enum { |
| READ_MORE, |
| FATAL_ERROR, |
| ENTER_DEBUG, |
| DISCONNECT_TELNET |
| } minitelnet_return; |
| |
| /* shared between readsocket() and readtty() */ |
| static char *tty_input; |
| |
| static int escape_count; |
| static int echo_check; |
| extern int quit_flag; |
| |
| static int |
| readsocket () |
| { |
| int data; |
| |
| /* Loop until the socket doesn't have any more data */ |
| |
| while ((data = readchar (0)) >= 0) |
| { |
| /* Check for the escape sequence */ |
| if (data == '|') |
| { |
| /* If this is the fourth escape, get out */ |
| if (++escape_count == 4) |
| { |
| return ENTER_DEBUG; |
| } |
| else |
| { /* This is a '|', but not the fourth in a row. |
| Continue without echoing it. If it isn't actually |
| one of four in a row, it'll be echoed later. */ |
| continue; |
| } |
| } |
| else /* Not a '|' */ |
| { |
| /* Ensure any pending '|'s are flushed. */ |
| |
| for ( ; escape_count > 0; escape_count--) |
| putchar('|'); |
| } |
| |
| if (data == '\r') /* If this is a return character, */ |
| continue; /* - just supress it. */ |
| |
| if (echo_check != -1) /* Check for echo of user input. */ |
| { |
| if (tty_input[echo_check] == data) |
| { |
| echo_check++; /* Character matched user input: */ |
| continue; /* Continue without echoing it. */ |
| } |
| else if ((data == '\n') && (tty_input[echo_check] == '\r')) |
| { /* End of the line (and of echo checking). */ |
| echo_check = -1; /* No more echo supression */ |
| continue; /* Continue without echoing. */ |
| } |
| else |
| { /* Failed check for echo of user input. |
| We now have some suppressed output to flush! */ |
| int j; |
| |
| for (j = 0; j < echo_check; j++) |
| putchar (tty_input[j]); |
| echo_check = -1; |
| } |
| } |
| putchar (data); /* Default case: output the char. */ |
| } |
| |
| if (data == SERIAL_TIMEOUT) /* Timeout returned from readchar. */ |
| return READ_MORE; /* Try to read some more */ |
| else |
| return FATAL_ERROR; /* Trouble, bail out */ |
| } |
| |
| static int |
| readtty () |
| { |
| int status; |
| int tty_bytecount; |
| |
| /* First, read a buffer full from the terminal */ |
| tty_bytecount = read (fileno (stdin), tty_input, sizeof (tty_input) - 1); |
| if (tty_bytecount == -1) |
| { |
| perror ("readtty: read failed"); |
| return FATAL_ERROR; |
| } |
| |
| /* Remove a quoted newline. */ |
| if (tty_input[tty_bytecount - 1] == '\n' && |
| tty_input[tty_bytecount - 2] == '\\') /* line ending in backslash */ |
| { |
| tty_input[--tty_bytecount] = 0; /* remove newline */ |
| tty_input[--tty_bytecount] = 0; /* remove backslash */ |
| } |
| |
| /* Turn trailing newlines into returns */ |
| if (tty_input[tty_bytecount - 1] == '\n') |
| tty_input[tty_bytecount - 1] = '\r'; |
| |
| /* If the line consists of a ~, enter debugging mode. */ |
| if ((tty_input[0] == '~') && (tty_bytecount == 2)) |
| return ENTER_DEBUG; |
| |
| /* Make this a zero terminated string and write it out */ |
| tty_input[tty_bytecount] = 0; |
| if (SERIAL_WRITE (remote_desc, tty_input, tty_bytecount)) |
| { |
| perror_with_name ("readtty: write failed"); |
| return FATAL_ERROR; |
| } |
| |
| return READ_MORE; |
| } |
| |
| static int |
| minitelnet () |
| { |
| fd_set input; /* file descriptors for select */ |
| int tablesize; /* max number of FDs for select */ |
| int status; |
| int quit_count = 0; |
| |
| extern int escape_count; /* global shared by readsocket */ |
| extern int echo_check; /* ditto */ |
| |
| escape_count = 0; |
| echo_check = -1; |
| |
| tablesize = 8 * sizeof (input); |
| |
| for (;;) |
| { |
| /* Check for anything from our socket - doesn't block. Note that |
| this must be done *before* the select as there may be |
| buffered I/O waiting to be processed. */ |
| |
| if ((status = readsocket ()) == FATAL_ERROR) |
| { |
| error ("Debugging terminated by communications error"); |
| } |
| else if (status != READ_MORE) |
| { |
| return (status); |
| } |
| |
| fflush(stdout); /* Flush output before blocking */ |
| |
| /* Now block on more socket input or TTY input */ |
| |
| FD_ZERO (&input); |
| FD_SET (fileno(stdin), &input); |
| FD_SET (remote_desc->fd, &input); |
| |
| status = select (tablesize, &input, 0, 0, 0); |
| if ((status == -1) && (errno != EINTR)) |
| { |
| error ("Communications error on select %d", errno); |
| } |
| |
| /* Handle Control-C typed */ |
| |
| if (quit_flag) |
| { |
| if ((++quit_count) == 2) |
| { |
| if (query ("Interrupt GDB? ")) |
| { |
| printf_filtered ("Interrupted by user.\n"); |
| return_to_top_level (RETURN_QUIT); |
| } |
| quit_count = 0; |
| } |
| quit_flag = 0; |
| |
| if (remote_break) |
| SERIAL_SEND_BREAK (remote_desc); |
| else |
| SERIAL_WRITE (remote_desc, "\003", 1); |
| |
| continue; |
| } |
| |
| /* Handle console input */ |
| |
| if (FD_ISSET (fileno (stdin), &input)) |
| { |
| quit_count = 0; |
| echo_check = 0; |
| status = readtty (); |
| if (status == READ_MORE) |
| continue; |
| |
| return status; /* telnet session ended */ |
| } |
| } |
| } |
| |
| static int |
| remote_cisco_wait (pid, status) |
| int pid; |
| struct target_waitstatus *status; |
| { |
| if (minitelnet() != ENTER_DEBUG) |
| { |
| error ("Debugging session terminated by protocol error"); |
| } |
| putpkt ("?"); |
| return remote_wait (pid, status); |
| } |
| |
| static void |
| init_remote_cisco_ops () |
| { |
| remote_cisco_ops.to_shortname = "cisco"; |
| remote_cisco_ops.to_longname = "Remote serial target in cisco-specific protocol"; |
| remote_cisco_ops.to_doc = |
| "Use a remote machine via TCP, using a cisco-specific protocol.\n\ |
| Specify the serial device it is connected to (e.g. host:2020)."; |
| remote_cisco_ops.to_open = remote_cisco_open; |
| remote_cisco_ops.to_close = remote_cisco_close; |
| remote_cisco_ops.to_detach = remote_detach; |
| remote_cisco_ops.to_resume = remote_resume; |
| remote_cisco_ops.to_wait = remote_cisco_wait; |
| remote_cisco_ops.to_fetch_registers = remote_fetch_registers; |
| remote_cisco_ops.to_store_registers = remote_store_registers; |
| remote_cisco_ops.to_prepare_to_store = remote_prepare_to_store; |
| remote_cisco_ops.to_xfer_memory = remote_xfer_memory; |
| remote_cisco_ops.to_files_info = remote_files_info; |
| remote_cisco_ops.to_insert_breakpoint = remote_insert_breakpoint; |
| remote_cisco_ops.to_remove_breakpoint = remote_remove_breakpoint; |
| remote_cisco_ops.to_kill = remote_kill; |
| remote_cisco_ops.to_load = generic_load; |
| remote_cisco_ops.to_mourn_inferior = remote_cisco_mourn; |
| remote_cisco_ops.to_thread_alive = remote_thread_alive; |
| remote_cisco_ops.to_find_new_threads = remote_threads_info; |
| remote_cisco_ops.to_stratum = process_stratum; |
| remote_cisco_ops.to_has_all_memory = 1; |
| remote_cisco_ops.to_has_memory = 1; |
| remote_cisco_ops.to_has_stack = 1; |
| remote_cisco_ops.to_has_registers = 1; |
| remote_cisco_ops.to_has_execution = 1; |
| remote_cisco_ops.to_magic = OPS_MAGIC; |
| } |
| |
| static void |
| build_remote_gdbarch_data () |
| { |
| tty_input = xmalloc (PBUFSIZ); |
| } |
| |
| |
| void |
| _initialize_remote () |
| { |
| /* architecture specific data */ |
| build_remote_gdbarch_data (); |
| register_gdbarch_swap (&tty_input, sizeof (&tty_input), NULL); |
| register_gdbarch_swap (NULL, 0, build_remote_gdbarch_data); |
| |
| /* runtime constants - we retain the value of remote_write_size |
| across architecture swaps. */ |
| remote_write_size = PBUFSIZ; |
| |
| init_remote_ops (); |
| add_target (&remote_ops); |
| |
| init_extended_remote_ops (); |
| add_target (&extended_remote_ops); |
| |
| init_remote_cisco_ops (); |
| add_target (&remote_cisco_ops); |
| |
| #if 0 |
| init_remote_threadtests (); |
| #endif |
| |
| 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 per 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); |
| |
| add_show_from_set |
| (add_set_cmd ("remotebinarydownload", no_class, |
| var_boolean, (char *) &remote_binary_download, |
| "Set binary downloads.\n", &setlist), |
| &showlist); |
| |
| add_info ("remote-process", remote_info_process, |
| "Query the remote system for process info."); |
| |
| } |