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Diffstat (limited to 'gdb/remote.c')
| -rw-r--r-- | gdb/remote.c | 3473 |
1 files changed, 3473 insertions, 0 deletions
diff --git a/gdb/remote.c b/gdb/remote.c new file mode 100644 index 00000000000..f5b6f7ca14b --- /dev/null +++ b/gdb/remote.c @@ -0,0 +1,3473 @@ +/* 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... 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" + +#ifdef USG +#include <sys/types.h> +#endif + +#include <signal.h> +#include "serial.h" + +/* Prototypes for local functions */ + +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 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 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)); + +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)); + +static int remote_current_thread PARAMS ((int oldpid)); + +int remote_find_new_threads PARAMS ((void)); + +static void record_currthread PARAMS ((int currthread)); + +static void init_remote_threads PARAMS ((void)); + +/* 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; + +static struct target_thread_vector remote_thread_vec; + +/* 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; + +/* Has the user attempted to interrupt the target? If so, then offer + the user the opportunity to bail out completely if he interrupts + again. */ +static int interrupted_already = 0; + +/* 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 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; + +/* 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). */ +#define PBUFSIZ 400 + +/* 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 ((PBUFSIZ-32)/2) + +/* Round up PBUFSIZ to hold all the registers, at least. */ +/* The blank line after the #if seems to be required to work around a + bug in HP's PA compiler. */ +#if REGISTER_BYTES > MAXBUFBYTES + +#undef PBUFSIZ +#define PBUFSIZ (REGISTER_BYTES * 2 + 32) +#endif + + +/* 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 = PBUFSIZ; + +/* 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 cont_thread; + +/* Call this function as a result of + 1) A halt indication (T packet) containing a thread id + 2) A direct query of currthread + 3) Successful execution of set thread + */ + +static void +record_currthread (currthread) + int currthread; +{ +#if 0 /* target_wait must not modify inferior_pid! */ + inferior_pid = currthread; +#endif + general_thread = currthread; +#if 0 /* setting cont_thread has a different meaning + from having the target report its thread id. */ + cont_thread = currthread; +#endif + /* 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); +} + +#define MAGIC_NULL_PID 42000 + +static void +set_thread (th, gen) + int th; + int gen; +{ + char buf[PBUFSIZ]; + int state = gen ? general_thread : cont_thread; + + if (state == th) + return; + + buf[0] = 'H'; + buf[1] = gen ? 'g' : 'c'; + if (th == 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 + cont_thread = th; +} + +/* Return nonzero if the thread TH is still alive on the remote system. */ + +static int +remote_thread_alive (th) + int th; +{ + char buf[PBUFSIZ]; + + buf[0] = 'T'; + if (th < 0) + sprintf (&buf[1], "-%08x", -th); + else + sprintf (&buf[1], "%08x", th); + putpkt (buf); + getpkt (buf, 0); + return (buf[0] == 'O' && buf[1] == 'K'); +} + +/* About these extended threadlist and threadinfo packets. They are + variable length packets but, the fields within them are often fixed + length. They are redundent enough to send over UDP as is the + remote protocol in general. There is a matching unit test module + in libstub. */ + +#define BUF_THREAD_ID_SIZE (OPAQUETHREADBYTES*2) + +/* encode 64 bits in 16 chars of hex */ + +static const char hexchars[] = "0123456789abcdef"; + +static int +ishex (ch, val) + 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[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[PBUFSIZ]; + char t_response[PBUFSIZ]; + int result = 1; + + /* Trancate result limit to be smaller than the packet size */ + if ((((result_limit + 1) * BUF_THREAD_ID_SIZE) + 10) >= PBUFSIZ) + result_limit = (PBUFSIZ / BUF_THREAD_ID_SIZE) - 2; + + pack_threadlist_request (threadlist_packet, + startflag, result_limit, nextthread); + putpkt (threadlist_packet); + getpkt (t_response, 0); + + *result_count = + parse_threadlist_response (t_response + 2, 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[PBUFSIZ]; + + putpkt ("qC"); + getpkt (buf, 0); + if (buf[0] == 'Q' && buf[1] == 'C') + return strtol (&buf[2], NULL, 16); + else + return oldpid; +} + +int +remote_find_new_threads () +{ + int ret; + + ret = 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); + return ret; +} + +/* Initialize the thread vector which is used by threads.c */ +/* The thread stub is a package, it has an initializer */ + +static void +init_remote_threads () +{ + remote_thread_vec.find_new_threads = remote_find_new_threads; + remote_thread_vec.get_thread_info = adapt_remote_get_threadinfo; +} + + +/* Restart the remote side; this is an extended protocol operation. */ + +static void +extended_remote_restart () +{ + char buf[PBUFSIZ]; + + /* Send the restart command; for reasons I don't understand the + remote side really expects a number after the "R". */ + buf[0] = 'R'; + sprintf (&buf[1], "%x", 0); + putpkt (buf); + + /* Now query for status so this looks just like we restarted + gdbserver from scratch. */ + putpkt ("?"); + getpkt (buf, 0); +} + +/* Clean up connection to a remote debugger. */ + +/* ARGSUSED */ +static void +remote_close (quitting) + int quitting; +{ + if (remote_desc) + SERIAL_CLOSE (remote_desc); + remote_desc = NULL; +} + +/* Query the remote side for the text, data and bss offsets. */ + +static void +get_offsets () +{ + char buf[PBUFSIZ], *ptr; + int lose; + CORE_ADDR text_addr, data_addr, bss_addr; + struct section_offsets *offs; + + putpkt ("qOffsets"); + + getpkt (buf, 0); + + if (buf[0] == '\000') + return; /* Return silently. Stub doesn't support + this command. */ + if (buf[0] == 'E') + { + warning ("Remote failure reply: %s", buf); + return; + } + + /* Pick up each field in turn. This used to be done with scanf, but + scanf will make trouble if CORE_ADDR size doesn't match + conversion directives correctly. The following code will work + with any size of CORE_ADDR. */ + text_addr = data_addr = bss_addr = 0; + ptr = buf; + lose = 0; + + if (strncmp (ptr, "Text=", 5) == 0) + { + ptr += 5; + /* Don't use strtol, could lose on big values. */ + while (*ptr && *ptr != ';') + text_addr = (text_addr << 4) + fromhex (*ptr++); + } + else + lose = 1; + + if (!lose && strncmp (ptr, ";Data=", 6) == 0) + { + ptr += 6; + while (*ptr && *ptr != ';') + data_addr = (data_addr << 4) + fromhex (*ptr++); + } + else + lose = 1; + + if (!lose && strncmp (ptr, ";Bss=", 5) == 0) + { + ptr += 5; + while (*ptr && *ptr != ';') + bss_addr = (bss_addr << 4) + fromhex (*ptr++); + } + else + lose = 1; + + if (lose) + error ("Malformed response to offset query, %s", buf); + + if (symfile_objfile == NULL) + return; + + offs = (struct section_offsets *) alloca (sizeof (struct section_offsets) + + symfile_objfile->num_sections + * sizeof (offs->offsets)); + memcpy (offs, symfile_objfile->section_offsets, + sizeof (struct section_offsets) + + symfile_objfile->num_sections + * sizeof (offs->offsets)); + + ANOFFSET (offs, SECT_OFF_TEXT) = text_addr; + + /* This is a temporary kludge to force data and bss to use the same offsets + because that's what nlmconv does now. The real solution requires changes + to the stub and remote.c that I don't have time to do right now. */ + + ANOFFSET (offs, SECT_OFF_DATA) = data_addr; + ANOFFSET (offs, SECT_OFF_BSS) = data_addr; + + objfile_relocate (symfile_objfile, offs); +} + +/* Stub for catch_errors. */ + +static int +remote_start_remote (dummy) + 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; + + start_remote (); /* Initialize gdb process mechanisms */ + return 1; +} + +/* Open a connection to a remote debugger. + NAME is the filename used for communication. */ + +static void +remote_open (name, from_tty) + char *name; + int from_tty; +{ + remote_open_1 (name, from_tty, &remote_ops, 0); +} + +/* Open a connection to a remote debugger using the extended + remote gdb protocol. NAME is the filename used for communication. */ + +static void +extended_remote_open (name, from_tty) + char *name; + int from_tty; +{ + remote_open_1 (name, from_tty, &extended_remote_ops, 1/*extended_p*/); +} + +/* Generic code for opening a connection to a remote target. */ + +static DCACHE *remote_dcache; + +static void +remote_open_1 (name, from_tty, target, extended_p) + char *name; + int from_tty; + struct target_ops *target; + int extended_p; +{ + if (name == 0) + error ("To open a remote debug connection, you need to specify what\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 */ + + /* The target vector does not have the thread functions in it yet, + so we use this function to call back into the thread module and + register the thread vector and its contained functions. */ + bind_target_thread_vector (&remote_thread_vec); + + /* Start out by trying the 'P' request to set registers. We set + this each time that we open a new target so that if the user + switches from one stub to another, we can (if the target is + closed and reopened) cope. */ + stub_supports_P = 1; + + general_thread = -2; + cont_thread = -2; + + /* 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[PBUFSIZ]; + putpkt ("!"); + getpkt (buf, 0); + } +} + +/* This takes a program previously attached to and detaches it. After + this is done, GDB can be used to debug some other program. We + better not have left any breakpoints in the target program or it'll + die when it hits one. */ + +static void +remote_detach (args, from_tty) + char *args; + int from_tty; +{ + char buf[PBUFSIZ]; + + if (args) + error ("Argument given to \"detach\" when remotely debugging."); + + /* Tell the remote target to detach. */ + strcpy (buf, "D"); + remote_send (buf); + + pop_target (); + if (from_tty) + puts_filtered ("Ending remote debugging.\n"); +} + +/* Convert hex digit A to a number. */ + +int +fromhex (a) + int a; +{ + if (a >= '0' && a <= '9') + return a - '0'; + else if (a >= 'a' && a <= 'f') + return a - 'a' + 10; + else if (a >= 'A' && a <= 'F') + return a - 'A' + 10; + else + error ("Reply contains invalid hex digit %d", a); +} + +/* Convert number NIB to a hex digit. */ + +static int +tohex (nib) + int nib; +{ + if (nib < 10) + return '0'+nib; + else + return 'a'+nib-10; +} + +/* Tell the remote machine to resume. */ + +static enum target_signal last_sent_signal = TARGET_SIGNAL_0; + +static int last_sent_step; + +static void +remote_resume (pid, step, siggnal) + int pid, step; + enum target_signal siggnal; +{ + char buf[PBUFSIZ]; + + if (pid == -1) + set_thread (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)); + +static void +remote_interrupt (signo) + int signo; +{ + remote_stop (); + signal (signo, remote_interrupt); +} + +static void +remote_stop () +{ + if (!interrupted_already) + { + /* Send a break or a ^C, depending on user preference. */ + interrupted_already = 1; + + if (remote_debug) + printf_unfiltered ("remote_stop called\n"); + + if (remote_break) + SERIAL_SEND_BREAK (remote_desc); + else + SERIAL_WRITE (remote_desc, "\003", 1); + } + else + { + signal (SIGINT, ofunc); + interrupt_query (); + signal (SIGINT, remote_interrupt); + interrupted_already = 0; + } +} + +/* Ask the user what to do when an interrupt is received. */ + +static void +interrupt_query () +{ + target_terminal_ours (); + + if (query ("Interrupted while waiting for the program.\n\ +Give up (and stop debugging it)? ")) + { + target_mourn_inferior (); + return_to_top_level (RETURN_QUIT); + } + + target_terminal_inferior (); +} + +/* If nonzero, ignore the next kill. */ + +int kill_kludge; + +void +remote_console_output (msg) + char *msg; +{ + char *p; + + for (p = msg; *p; p +=2) + { + char tb[2]; + char c = fromhex (p[0]) * 16 + fromhex (p[1]); + tb[0] = c; + tb[1] = 0; + if (target_output_hook) + target_output_hook (tb); + else + fputs_filtered (tb, gdb_stdout); + } +} + +/* Wait until the remote machine stops, then return, storing status in + STATUS just as `wait' would. Returns "pid" (though it's not clear + what, if anything, that means in the case of this target). */ + +static int +remote_wait (pid, status) + int pid; + struct target_waitstatus *status; +{ + unsigned char buf[PBUFSIZ]; + int thread_num = -1; + + status->kind = TARGET_WAITKIND_EXITED; + status->value.integer = 0; + + while (1) + { + unsigned char *p; + + interrupted_already = 0; + ofunc = signal (SIGINT, remote_interrupt); + getpkt ((char *) buf, 1); + signal (SIGINT, ofunc); + + /* This is a hook for when we need to do something (perhaps the + collection of trace data) every time the target stops. */ + if (target_wait_loop_hook) + (*target_wait_loop_hook) (); + + switch (buf[0]) + { + case 'E': /* Error of some sort */ + warning ("Remote failure reply: %s", buf); + continue; + case 'T': /* Status with PC, SP, FP, ... */ + { + int i; + long regno; + char regs[MAX_REGISTER_RAW_SIZE]; + + /* Expedited reply, containing Signal, {regno, reg} repeat */ + /* format is: 'Tssn...:r...;n...:r...;n...:r...;#cc', where + ss = signal number + n... = register number + r... = register contents + */ + p = &buf[3]; /* after Txx */ + + while (*p) + { + unsigned char *p1; + char *p_temp; + + /* 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]))); + + goto got_status; + case 'W': /* Target exited */ + { + /* The remote process exited. */ + status->kind = TARGET_WAITKIND_EXITED; + status->value.integer = (fromhex (buf[1]) << 4) + fromhex (buf[2]); + goto got_status; + } + case 'X': + status->kind = TARGET_WAITKIND_SIGNALLED; + status->value.sig = (enum target_signal) + (((fromhex (buf[1])) << 4) + (fromhex (buf[2]))); + kill_kludge = 1; + + goto got_status; + case 'O': /* Console output */ + remote_console_output (buf + 1); + continue; + case '\0': + if (last_sent_signal != TARGET_SIGNAL_0) + { + /* Zero length reply means that we tried 'S' or 'C' and + the remote system doesn't support it. */ + target_terminal_ours_for_output (); + printf_filtered + ("Can't send signals to this remote system. %s not sent.\n", + target_signal_to_name (last_sent_signal)); + last_sent_signal = TARGET_SIGNAL_0; + target_terminal_inferior (); + + strcpy ((char *) buf, last_sent_step ? "s" : "c"); + putpkt ((char *) buf); + continue; + } + /* else fallthrough */ + default: + warning ("Invalid remote reply: %s", buf); + continue; + } + } + got_status: + if (thread_num != -1) + { + /* Initial thread value can only be acquired via wait, so deal with + this marker which is used before the first thread value is + acquired. */ + if (inferior_pid == MAGIC_NULL_PID) + { + inferior_pid = thread_num; + if (!in_thread_list (inferior_pid)) + add_thread (inferior_pid); + } + return thread_num; + } + return inferior_pid; +} + +/* Number of bytes of registers this stub implements. */ + +static int register_bytes_found; + +/* Read the remote registers into the block REGS. */ +/* Currently we just read all the registers, so we don't use regno. */ + +/* ARGSUSED */ +static void +remote_fetch_registers (regno) + int regno; +{ + char buf[PBUFSIZ]; + int i; + char *p; + char regs[REGISTER_BYTES]; + + set_thread (inferior_pid, 1); + + sprintf (buf, "g"); + remote_send (buf); + + if (remote_register_buf_size == 0) + remote_register_buf_size = strlen (buf); + + /* Unimplemented registers read as all bits zero. */ + memset (regs, 0, REGISTER_BYTES); + + /* We can get out of synch in various cases. If the first character + in the buffer is not a hex character, assume that has happened + and try to fetch another packet to read. */ + while ((buf[0] < '0' || buf[0] > '9') + && (buf[0] < 'a' || buf[0] > 'f') + && buf[0] != 'x') /* New: unavailable register value */ + { + if (remote_debug) + printf_unfiltered ("Bad register packet; fetching a new packet\n"); + getpkt (buf, 0); + } + + /* Reply describes registers byte by byte, each byte encoded as two + hex characters. Suck them all up, then supply them to the + register cacheing/storage mechanism. */ + + p = buf; + for (i = 0; i < REGISTER_BYTES; i++) + { + if (p[0] == 0) + break; + if (p[1] == 0) + { + warning ("Remote reply is of odd length: %s", buf); + /* Don't change register_bytes_found in this case, and don't + print a second warning. */ + goto supply_them; + } + if (p[0] == 'x' && p[1] == 'x') + regs[i] = 0; /* 'x' */ + else + regs[i] = fromhex (p[0]) * 16 + fromhex (p[1]); + p += 2; + } + + if (i != register_bytes_found) + { + register_bytes_found = i; +#ifdef REGISTER_BYTES_OK + if (!REGISTER_BYTES_OK (i)) + warning ("Remote reply is too short: %s", buf); +#endif + } + + supply_them: + for (i = 0; i < NUM_REGS; i++) + { + supply_register (i, ®s[REGISTER_BYTE(i)]); + if (buf[REGISTER_BYTE(i) * 2] == 'x') + register_valid[i] = -1; /* register value not available */ + } +} + +/* Prepare to store registers. Since we may send them all (using a + 'G' request), we have to read out the ones we don't want to change + first. */ + +static void +remote_prepare_to_store () +{ + /* Make sure the entire registers array is valid. */ + read_register_bytes (0, (char *)NULL, REGISTER_BYTES); +} + +/* Store register REGNO, or all registers if REGNO == -1, from the contents + of REGISTERS. FIXME: ignores errors. */ + +static void +remote_store_registers (regno) + int regno; +{ + char buf[PBUFSIZ]; + int i; + char *p; + + set_thread (inferior_pid, 1); + + if (regno >= 0 && stub_supports_P) + { + /* Try storing a single register. */ + char *regp; + + sprintf (buf, "P%x=", regno); + p = buf + strlen (buf); + regp = ®isters[REGISTER_BYTE (regno)]; + for (i = 0; i < REGISTER_RAW_SIZE (regno); ++i) + { + *p++ = tohex ((regp[i] >> 4) & 0xf); + *p++ = tohex (regp[i] & 0xf); + } + *p = '\0'; + remote_send (buf); + if (buf[0] != '\0') + { + /* The stub understands the 'P' request. We are done. */ + return; + } + + /* The stub does not support the 'P' request. Use 'G' instead, + and don't try using 'P' in the future (it will just waste our + time). */ + stub_supports_P = 0; + } + + buf[0] = 'G'; + + /* Command describes registers byte by byte, + each byte encoded as two hex characters. */ + + p = buf + 1; + /* remote_prepare_to_store insures that register_bytes_found gets set. */ + for (i = 0; i < register_bytes_found; i++) + { + *p++ = tohex ((registers[i] >> 4) & 0xf); + *p++ = tohex (registers[i] & 0xf); + } + *p = '\0'; + + remote_send (buf); +} + +/* Use of the data cache *used* to be disabled because it loses for looking + at and changing hardware I/O ports and the like. Accepting `volatile' + would perhaps be one way to fix it. Another idea would be to use the + executable file for the text segment (for all SEC_CODE sections? + For all SEC_READONLY sections?). This has problems if you want to + actually see what the memory contains (e.g. self-modifying code, + clobbered memory, user downloaded the wrong thing). + + Because it speeds so much up, it's now enabled, if you're playing + with registers you turn it of (set remotecache 0). */ + +/* Read a word from remote address ADDR and return it. + This goes through the data cache. */ + +#if 0 /* unused? */ +static int +remote_fetch_word (addr) + CORE_ADDR addr; +{ + return dcache_fetch (remote_dcache, addr); +} + +/* Write a word WORD into remote address ADDR. + This goes through the data cache. */ + +static void +remote_store_word (addr, word) + CORE_ADDR addr; + int word; +{ + dcache_poke (remote_dcache, addr, word); +} +#endif /* 0 (unused?) */ + + + +/* Return the number of hex digits in num. */ + +static int +hexnumlen (num) + ULONGEST num; +{ + int i; + + for (i = 0; num != 0; i++) + num >>= 4; + + return max (i, 1); +} + +/* Set BUF to the hex digits representing NUM. */ + +static int +hexnumstr (buf, num) + char *buf; + ULONGEST num; +{ + int i; + int len = hexnumlen (num); + + buf[len] = '\0'; + + for (i = len - 1; i >= 0; i--) + { + buf[i] = "0123456789abcdef" [(num & 0xf)]; + num >>= 4; + } + + return len; +} + +/* Mask all but the least significant REMOTE_ADDRESS_SIZE bits. */ + +static CORE_ADDR +remote_address_masked (addr) + CORE_ADDR addr; +{ + if (remote_address_size > 0 + && remote_address_size < (sizeof (ULONGEST) * 8)) + { + /* Only create a mask when that mask can safely be constructed + in a ULONGEST variable. */ + ULONGEST mask = 1; + mask = (mask << remote_address_size) - 1; + addr &= mask; + } + return addr; +} + +/* 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. */ +static void +check_binary_download (addr) + CORE_ADDR addr; +{ + if (remote_binary_download && !remote_binary_checked) + { + char buf[PBUFSIZ], *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) + printf_unfiltered ("binary downloading suppported by target\n"); + else + printf_unfiltered ("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; +{ + 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 - $M<memaddr>,<len>:#nn */ + max_buf_size -= 2 + hexnumlen (memaddr + len - 1) + 1 + hexnumlen (len) + 4; + + origlen = len; + while (len > 0) + { + unsigned char buf[PBUFSIZ]; + unsigned char *p, *plen; + int todo; + int i; + + /* construct "M"<memaddr>","<len>":" */ + /* sprintf (buf, "M%lx,%x:", (unsigned long) memaddr, todo); */ + memaddr = remote_address_masked (memaddr); + p = buf; + if (remote_binary_download) + { + *p++ = 'X'; + todo = min (len, max_buf_size); + } + else + { + *p++ = 'M'; + todo = min (len, max_buf_size / 2); /* num bytes that will fit */ + } + + p += hexnumstr (p, (ULONGEST) memaddr); + *p++ = ','; + + plen = p; /* remember where len field goes */ + p += hexnumstr (p, (ULONGEST) todo); + *p++ = ':'; + *p = '\0'; + + /* We send target system values byte by byte, in increasing byte + addresses, each byte encoded as two hex characters (or one + binary character). */ + if (remote_binary_download) + { + int escaped = 0; + for (i = 0; + (i < todo) && (i + escaped) < (max_buf_size - 2); + i++) + { + switch (myaddr[i] & 0xff) + { + case '$': + 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; +{ + int max_buf_size; /* Max size of packet output buffer */ + int origlen; + + /* Chop the transfer down if necessary */ + + max_buf_size = min (remote_write_size, PBUFSIZ); + if (remote_register_buf_size != 0) + max_buf_size = min (max_buf_size, remote_register_buf_size); + + origlen = len; + while (len > 0) + { + char buf[PBUFSIZ]; + char *p; + int todo; + int i; + + todo = min (len, max_buf_size / 2); /* num bytes that will fit */ + + /* construct "m"<memaddr>","<len>" */ + /* sprintf (buf, "m%lx,%x", (unsigned long) memaddr, todo); */ + memaddr = remote_address_masked (memaddr); + p = buf; + *p++ = 'm'; + p += hexnumstr (p, (ULONGEST) memaddr); + *p++ = ','; + p += hexnumstr (p, (ULONGEST) todo); + *p = '\0'; + + putpkt (buf); + getpkt (buf, 0); + + if (buf[0] == 'E') + { + /* There is no correspondance between what the remote protocol uses + for errors and errno codes. We would like a cleaner way of + representing errors (big enough to include errno codes, bfd_error + codes, and others). But for now just return EIO. */ + errno = EIO; + return 0; + } + + /* Reply describes memory byte by byte, + each byte encoded as two hex characters. */ + + p = buf; + for (i = 0; i < todo; i++) + { + if (p[0] == 0 || p[1] == 0) + /* Reply is short. This means that we were able to read + only part of what we wanted to. */ + return i + (origlen - len); + myaddr[i] = fromhex (p[0]) * 16 + fromhex (p[1]); + p += 2; + } + myaddr += todo; + memaddr += todo; + len -= todo; + } + return origlen; +} + +/* Read or write LEN bytes from inferior memory at MEMADDR, + transferring to or from debugger address MYADDR. Write to inferior + if SHOULD_WRITE is nonzero. Returns length of data written or + read; 0 for error. */ + +/* ARGSUSED */ +static int +remote_xfer_memory (memaddr, myaddr, len, should_write, target) + CORE_ADDR memaddr; + char *myaddr; + int len; + int should_write; + struct target_ops *target; /* ignored */ +{ +#ifdef REMOTE_TRANSLATE_XFER_ADDRESS + CORE_ADDR targaddr; + int targlen; + REMOTE_TRANSLATE_XFER_ADDRESS (memaddr, len, targaddr, targlen); + if (targlen == 0) + return 0; + memaddr = targaddr; + len = targlen; +#endif + + return dcache_xfer_memory (remote_dcache, memaddr, myaddr, + len, should_write); +} + + +#if 0 +/* Enable after 4.12. */ + +void +remote_search (len, data, mask, startaddr, increment, lorange, hirange + addr_found, data_found) + int len; + char *data; + char *mask; + CORE_ADDR startaddr; + int increment; + CORE_ADDR lorange; + CORE_ADDR hirange; + CORE_ADDR *addr_found; + char *data_found; +{ + if (increment == -4 && len == 4) + { + long mask_long, data_long; + long data_found_long; + CORE_ADDR addr_we_found; + char buf[PBUFSIZ]; + long returned_long[2]; + char *p; + + mask_long = extract_unsigned_integer (mask, len); + data_long = extract_unsigned_integer (data, len); + sprintf (buf, "t%x:%x,%x", startaddr, data_long, mask_long); + putpkt (buf); + getpkt (buf, 0); + if (buf[0] == '\0') + { + /* The stub doesn't support the 't' request. We might want to + remember this fact, but on the other hand the stub could be + switched on us. Maybe we should remember it only until + the next "target remote". */ + generic_search (len, data, mask, startaddr, increment, lorange, + hirange, addr_found, data_found); + return; + } + + if (buf[0] == 'E') + /* There is no correspondance between what the remote protocol uses + for errors and errno codes. We would like a cleaner way of + representing errors (big enough to include errno codes, bfd_error + codes, and others). But for now just use EIO. */ + memory_error (EIO, startaddr); + p = buf; + addr_we_found = 0; + while (*p != '\0' && *p != ',') + addr_we_found = (addr_we_found << 4) + fromhex (*p++); + if (*p == '\0') + error ("Protocol error: short return for search"); + + data_found_long = 0; + while (*p != '\0' && *p != ',') + data_found_long = (data_found_long << 4) + fromhex (*p++); + /* Ignore anything after this comma, for future extensions. */ + + if (addr_we_found < lorange || addr_we_found >= hirange) + { + *addr_found = 0; + return; + } + + *addr_found = addr_we_found; + *data_found = store_unsigned_integer (data_we_found, len); + return; + } + generic_search (len, data, mask, startaddr, increment, lorange, + hirange, addr_found, data_found); +} +#endif /* 0 */ + +static void +remote_files_info (ignore) + struct target_ops *ignore; +{ + puts_filtered ("Debugging a target over a serial line.\n"); +} + +/* Stuff for dealing with the packets which are part of this protocol. + See comment at top of file for details. */ + +/* Read a single character from the remote end, masking it down to 7 bits. */ + +static int +readchar (timeout) + int timeout; +{ + int ch; + + ch = SERIAL_READCHAR (remote_desc, timeout); + + switch (ch) + { + case SERIAL_EOF: + error ("Remote connection closed"); + case SERIAL_ERROR: + perror_with_name ("Remote communication error"); + case SERIAL_TIMEOUT: + return ch; + default: + return ch & 0x7f; + } +} + +/* Send the command in BUF to the remote machine, and read the reply + into BUF. Report an error if we get an error reply. */ + +static void +remote_send (buf) + char *buf; +{ + putpkt (buf); + getpkt (buf, 0); + + if (buf[0] == 'E') + error ("Remote failure reply: %s", buf); +} + +/* Display a null-terminated packet on stdout, for debugging, using C + string notation. */ + +static void +print_packet (buf) + char *buf; +{ + puts_filtered ("\""); + while (*buf) + gdb_printchar (*buf++, gdb_stdout, '"'); + puts_filtered ("\""); +} + +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 $, # and checksum, and for a possible /0 if we are + debugging (remote_debug) and want to print the sent packet as a string */ + +static int +putpkt_binary (buf, cnt) + char *buf; + int cnt; +{ + int i; + unsigned char csum = 0; + char buf2[PBUFSIZ]; + int ch; + int tcount = 0; + char *p; + + /* Copy the packet into buffer BUF2, encapsulating it + and giving it a checksum. */ + + if (cnt > (int) sizeof (buf2) - 5) /* Prosanity check */ + abort (); + + p = buf2; + *p++ = '$'; + + 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'; + printf_unfiltered ("Sending packet: %s...", buf2); + gdb_flush (gdb_stdout); + } + if (SERIAL_WRITE (remote_desc, buf2, p - buf2)) + perror_with_name ("putpkt: write failed"); + + /* read until either a timeout occurs (-2) or '+' is read */ + while (1) + { + ch = readchar (remote_timeout); + + if (remote_debug) + { + switch (ch) + { + case '+': + case SERIAL_TIMEOUT: + case '$': + if (started_error_output) + { + putchar_unfiltered ('\n'); + started_error_output = 0; + } + } + } + + switch (ch) + { + case '+': + if (remote_debug) + printf_unfiltered ("Ack\n"); + return 1; + case SERIAL_TIMEOUT: + tcount ++; + if (tcount > 3) + return 0; + break; /* Retransmit buffer */ + case '$': + { + char junkbuf[PBUFSIZ]; + + /* It's probably an old response, and we're out of sync. + Just gobble up the packet and ignore it. */ + getpkt (junkbuf, 0); + continue; /* Now, go look for + */ + } + default: + if (remote_debug) + { + if (!started_error_output) + { + started_error_output = 1; + printf_unfiltered ("putpkt: Junk: "); + } + putchar_unfiltered (ch & 0177); + } + continue; + } + break; /* Here to retransmit */ + } + +#if 0 + /* This is wrong. If doing a long backtrace, the user should be + able to get out next time we call QUIT, without anything as + violent as interrupt_query. If we want to provide a way out of + here without getting to the next QUIT, it should be based on + hitting ^C twice as in remote_wait. */ + if (quit_flag) + { + quit_flag = 0; + interrupt_query (); + } +#endif + } +} + +/* Come here after finding the start of the frame. Collect the rest + into BUF, verifying the checksum, length, and handling run-length + compression. Returns 0 on any error, 1 on success. */ + +static int +read_frame (buf) + char *buf; +{ + unsigned char csum; + char *bp; + int c; + + csum = 0; + bp = buf; + + while (1) + { + c = readchar (remote_timeout); + + switch (c) + { + case SERIAL_TIMEOUT: + if (remote_debug) + puts_filtered ("Timeout in mid-packet, retrying\n"); + return 0; + case '$': + if (remote_debug) + puts_filtered ("Saw new packet start in middle of old one\n"); + return 0; /* Start a new packet, count retries */ + case '#': + { + unsigned char pktcsum; + + *bp = '\000'; + + pktcsum = fromhex (readchar (remote_timeout)) << 4; + pktcsum |= fromhex (readchar (remote_timeout)); + + if (csum == pktcsum) + return 1; + + if (remote_debug) + { + printf_filtered ("Bad checksum, sentsum=0x%x, csum=0x%x, buf=", + pktcsum, csum); + puts_filtered (buf); + puts_filtered ("\n"); + } + return 0; + } + case '*': /* Run length encoding */ + csum += c; + c = readchar (remote_timeout); + csum += c; + c = c - ' ' + 3; /* Compute repeat count */ + + + if (c > 0 && c < 255 && bp + c - 1 < buf + PBUFSIZ - 1) + { + memset (bp, *(bp - 1), c); + bp += c; + continue; + } + + *bp = '\0'; + printf_filtered ("Repeat count %d too large for buffer: ", c); + puts_filtered (buf); + puts_filtered ("\n"); + return 0; + + default: + if (bp < buf + PBUFSIZ - 1) + { + *bp++ = c; + csum += c; + continue; + } + + *bp = '\0'; + puts_filtered ("Remote packet too long: "); + puts_filtered (buf); + puts_filtered ("\n"); + + return 0; + } + } +} + +/* Read a packet from the remote machine, with error checking, and + store it in BUF. BUF is expected to be of size PBUFSIZ. If + FOREVER, wait forever rather than timing out; this is used while + the target is executing user code. */ + +void +getpkt (buf, forever) + char *buf; + int forever; +{ + int c; + int tries; + int timeout; + int val; + + strcpy (buf,"timeout"); + + if (forever) + { +#ifdef MAINTENANCE_CMDS + timeout = watchdog > 0 ? watchdog : -1; +#else + timeout = -1; +#endif + } + + else + timeout = remote_timeout; + +#define MAX_TRIES 3 + + for (tries = 1; tries <= MAX_TRIES; tries++) + { + /* This can loop forever if the remote side sends us characters + continuously, but if it pauses, we'll get a zero from readchar + because of timeout. Then we'll count that as a retry. */ + + /* Note that we will only wait forever prior to the start of a packet. + After that, we expect characters to arrive at a brisk pace. They + should show up within remote_timeout intervals. */ + + do + { + c = readchar (timeout); + + if (c == SERIAL_TIMEOUT) + { +#ifdef MAINTENANCE_CMDS + if (forever) /* Watchdog went off. Kill the target. */ + { + target_mourn_inferior (); + error ("Watchdog has expired. Target detached.\n"); + } +#endif + if (remote_debug) + puts_filtered ("Timed out.\n"); + goto retry; + } + } + while (c != '$'); + + /* We've found the start of a packet, now collect the data. */ + + val = read_frame (buf); + + if (val == 1) + { + if (remote_debug) + fprintf_unfiltered (gdb_stdout, "Packet received: %s\n", buf); + SERIAL_WRITE (remote_desc, "+", 1); + return; + } + + /* Try the whole thing again. */ + retry: + SERIAL_WRITE (remote_desc, "-", 1); + } + + /* We have tried hard enough, and just can't receive the packet. Give up. */ + + printf_unfiltered ("Ignoring packet error, continuing...\n"); + SERIAL_WRITE (remote_desc, "+", 1); +} + +static void +remote_kill () +{ + /* For some mysterious reason, wait_for_inferior calls kill instead of + mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ + if (kill_kludge) + { + kill_kludge = 0; + target_mourn_inferior (); + return; + } + + /* Use catch_errors so the user can quit from gdb even when we aren't on + speaking terms with the remote system. */ + catch_errors ((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, *sectdata, *sectname, buf[PBUFSIZ]; + bfd_size_type size; + bfd_vma lma; + int matched = 0; + int mismatched = 0; + + if (!exec_bfd) + error ("command cannot be used without an exec file"); + if (!current_target.to_shortname || + strcmp (current_target.to_shortname, "remote") != 0) + error ("command can only be used with remote target"); + + for (s = exec_bfd->sections; s; s = s->next) + { + if (!(s->flags & SEC_LOAD)) + continue; /* skip non-loadable section */ + + size = bfd_get_section_size_before_reloc (s); + if (size == 0) + continue; /* skip zero-length section */ + + sectname = (char *) bfd_get_section_name (exec_bfd, s); + if (args && strcmp (args, sectname) != 0) + continue; /* not the section selected by user */ + + matched = 1; /* do this section */ + lma = s->lma; + /* FIXME: assumes lma can fit into long */ + sprintf (buf, "qCRC:%lx,%lx", (long) lma, (long) size); + putpkt (buf); + + /* be clever; compute the host_crc before waiting for target reply */ + sectdata = xmalloc (size); + old_chain = make_cleanup (free, sectdata); + bfd_get_section_contents (exec_bfd, s, sectdata, 0, size); + host_crc = crc32 ((unsigned char *) sectdata, size, 0xffffffff); + + getpkt (buf, 0); + if (buf[0] == 'E') + error ("target memory fault, section %s, range 0x%08x -- 0x%08x", + sectname, lma, lma + size); + if (buf[0] != 'C') + error ("remote target does not support this operation"); + + for (target_crc = 0, tmp = &buf[1]; *tmp; tmp++) + target_crc = target_crc * 16 + fromhex (*tmp); + + printf_filtered ("Section %s, range 0x%08x -- 0x%08x: ", + sectname, lma, lma + size); + if (host_crc == target_crc) + printf_filtered ("matched.\n"); + else + { + printf_filtered ("MIS-MATCHED!\n"); + mismatched++; + } + + do_cleanups (old_chain); + } + if (mismatched > 0) + warning ("One or more sections of the remote executable does not match\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[PBUFSIZ]; + char *p2 = &buf2[0]; + char *p = buf; + + if (! bufsiz) + error ("null pointer to remote bufer size specified"); + + /* minimum outbuf size is PBUFSIZE - 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[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_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; +} + +void +_initialize_remote () +{ + init_remote_ops (); + add_target (&remote_ops); + + init_extended_remote_ops (); + add_target (&extended_remote_ops); + init_remote_threads (); +#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); +} |