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/*
 * Copyright (c) 1995, 1996 Cygnus Support
 *
 * The authors hereby grant permission to use, copy, modify, distribute,
 * and license this software and its documentation for any purpose, provided
 * that existing copyright notices are retained in all copies and that this
 * notice is included verbatim in any distributions. No written agreement,
 * license, or royalty fee is required for any of the authorized uses.
 * Modifications to this software may be copyrighted by their authors
 * and need not follow the licensing terms described here, provided that
 * the new terms are clearly indicated on the first page of each file where
 * they apply.
 */
 
/*
 *   A debug packet whose contents are <data> looks like:
 *
 *        $ <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.
 *
 *   We respond 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.
 */
 
#include "debug.h"
#include <signal.h>
 
/*
 * buffers that hold the packets while they're being constructed.
 */
char packet_in_buf[BUFMAX];
char packet_out_buf[BUFMAX];
int packet_index;
 
/*
 * indicate to caller of mem2hex or hex2mem that there has been an error.
 * 0 means ok, 1 means error
 */
volatile int mem_err = 0;
 
/*
 * 1 means print debugging messages from the target, 0 means be quiet. This is
 * changed by gdb_debug().
 */
int remote_debug = 0;
 
/*
 * indicate whether the debug vectors ahave been initialized
 * 0 means not yet, 1 means yep, it's ready.
 */
int initialized = 0;
 
/*
 * These variables are instantialted in the GDB stub code.
 */
 
/* this is a list of signal to exception mappings. */
extern struct trap_info hard_trap_info[];
 
/* this is a memory fault exception handler, used by mem2hex & hex2mem */
extern void set_mem_fault_trap();
 
/*
 * print debugging messages. This uses print, rather than one of the
 * stdio routines, cause if there are stack or memory problems, the
 * stdio routines don't work.
 *      params are the debug level, and the string to print
 *      it doesn't return anything.
 */
void
debuglog(int level, char *msg)
{
  char *p;
  unsigned char buf[BUFMAX];
  char newmsg[BUFMAX];
  int i;
 
  if (level > remote_debug)
    return;
 
  if ((level <0) || (level > 100)) {
    print ("ERROR: debug print level out of range");
    return;
  }
 
  /* convert some characters so it'll look right in the log */
  p = newmsg;
  for (i = 0 ; msg[i] != '\0'; i++) {
    if (i > BUFMAX)
      print ("\r\nERROR: Debug message too long\r\n");
    switch (msg[i]) {
    case '\n':                                  /* newlines */
      *p++ = '\\';
      *p++ = 'n';
      continue;
    case '\r':                                  /* carriage returns */
      *p++ = '\\';
      *p++ = 'r';
      continue;
    case '\033':                                /* escape */
      *p++ = '\\';
      *p++ = 'e';
      continue;
    case '\t':                                  /* tab */
      *p++ = '\\';
      *p++ = 't';
      continue;
    case '\b':                                  /* backspace */
      *p++ = '\\';
      *p++ = 'b';
      continue;
    default:                                    /* no change */
      *p++ = msg[i];
    }
 
    if (msg[i] < 26) {                          /* modify control characters */
      *p++ = '^';
      *p++ = msg[i] + 'A';
      continue;
    }
    if (msg[i] >= 127) {                        /* modify control characters */
      *p++ = '!';
      *p++ = msg[i] + 'A';
      continue;
    }
  }
  *p = '\0';                                    /* terminate the string */
  print (newmsg);
  print ("\r\n");
}
 
/*
 * convert an ascii hex digit to a number.
 *      param is hex digit.
 *      returns a decimal digit.
 */
int
hex2digit (int digit)
{
  if (digit == 0)
    return 0;
 
  if (digit >= '0' && digit <= '9')
    return digit - '0';
  if (digit >= 'a' && digit <= 'f')
    return digit - 'a' + 10;
  if (digit >= 'A' && digit <= 'F')
    return digit - 'A' + 10;
 
  /* shouldn't ever get this far */
  return ERROR;
}
 
/*
 * convert number NIB to a hex digit.
 *      param is a decimal digit.
 *      returns a hex digit.
 */
char
digit2hex(int digit)
{
  if (digit < 10)
    return '0' + digit;
  else
    return 'a' + digit - 10;
}
 
/*
 * Convert the memory pointed to by mem into hex, placing result in buf.
 * Return a pointer to the last char put in buf (null), in case of mem fault,
 * return 0.
 * If MAY_FAULT is non-zero, then we will handle memory faults by returning
 * a 0, else treat a fault like any other fault in the stub.
 */
unsigned char *
mem2hex(unsigned char *mem, unsigned char *buf, int count, int may_fault)
{
  unsigned char ch;
 
  DEBUG (1, "In mem2hex");
 
  set_mem_fault_trap(MAY_FAULT);
 
  while (count-- > 0) {
    ch = *mem++;
    if (mem_err) {
      DEBUG (1, "memory fault in mem2hex");
      return 0;
    }
    *buf++ = digit2hex(ch >> 4);
    *buf++ = digit2hex(ch & 0xf);
  }
 
  *buf = 0;
 
  set_mem_fault_trap(OK);
 
  return buf;
}
 
/*
 * Convert the hex array pointed to by buf into binary to be placed in mem
 * return a pointer to the character AFTER the last byte written
 */
unsigned char *
hex2mem(unsigned char *buf, unsigned char *mem, int count, int may_fault)
{
  int i;
  unsigned char ch;
 
  DEBUG (1, "In hex2mem");
 
  set_mem_fault_trap(may_fault);
 
  for (i=0; i<count; i++) {
    ch = hex2digit(*buf++) << 4;
    ch |= hex2digit(*buf++);
    *mem++ = ch;
    if (mem_err)
      return 0;
  }
 
  set_mem_fault_trap(0);
 
  return mem;
}
 
/*
 * while we find nice hex chars, build an int.
 *      param is a pointer to the string.
 *      returns the int in the param field, and the number of chars processed.
 */
int
hex2int (char **ptr, int *intValue)
{
  int numChars = 0;
  int hexValue;
 
  *intValue = 0;
 
  while (**ptr)
    {
      hexValue = hex2digit(**ptr);
      if (hexValue < 0)
        break;
 
      *intValue = (*intValue << 4) | hexValue;
      numChars ++;
      (*ptr)++;
    }
  return (numChars);
}
 
/*
 * Scan for the sequence $<data>#<checksum>
 */
void
getpacket(unsigned char *buffer)
{
  unsigned char checksum;
  unsigned char xmitcsum;
  int i;
  int count;
  unsigned char ch;
 
  do {
    /* wait around for the start character, ignore all other characters */
    while ((ch = (inbyte() & 0x7f)) != '$') ;
 
    checksum = 0;
    xmitcsum = -1;
 
    count = 0;
 
    /* now, read until a # or end of buffer is found */
    while (count < BUFMAX) {
      ch = inbyte() & 0x7f;
      if (ch == '#')
        break;
      checksum = checksum + ch;
      buffer[count] = ch;
      count = count + 1;
    }
 
    if (count >= BUFMAX)
      continue;
 
    buffer[count] = 0;
 
    if (ch == '#') {
      xmitcsum = hex2digit(inbyte() & 0x7f) << 4;
      xmitcsum |= hex2digit(inbyte() & 0x7f);
#if 1
      /* Humans shouldn't have to figure out checksums to type to it. */
      outbyte ('+');
      return;
#endif
      if (checksum != xmitcsum)
        outbyte('-');   /* failed checksum */
      else {
        outbyte('+'); /* successful transfer */
        /* if a sequence char is present, reply the sequence ID */
        if (buffer[2] == ':') {
          outbyte(buffer[0]);
          outbyte(buffer[1]);
          /* remove sequence chars from buffer */
          count = strlen(buffer);
          for (i=3; i <= count; i++)
            buffer[i-3] = buffer[i];
        }
      }
    }
  }
  while (checksum != xmitcsum);
}
 
/*
 * Send the packet in buffer.
 */
void
putpacket(unsigned char *buffer)
{
  unsigned char checksum;
  int count;
  unsigned char ch;
 
  /*  $<packet info>#<checksum>. */
  do {
    outbyte('$');
    checksum = 0;
    count = 0;
 
    while (ch = buffer[count]) {
      if (! outbyte(ch))
        return;
      checksum += ch;
      count += 1;
    }
 
    outbyte('#');
    outbyte(digit2hex(checksum >> 4));
    outbyte(digit2hex(checksum & 0xf));
 
  }
  while ((inbyte() & 0x7f) != '+');
}
 
/*
 *
 */
void
gdb_event_loop(int sigval, unsigned long *registers)
{
  int addr;
  int length;
  unsigned char *ptr;
  ptr = packet_out_buf;
 
  DEBUG (1, "In gdb_event_loop");
 
  while (1) {
    packet_out_buf[0] = 0;
 
    getpacket(packet_in_buf);
    ptr = &packet_in_buf[1];
 
    switch (packet_in_buf[0]) {
    case '?':           /* get the last known signal */
      gdb_last_signal(sigval);
      break;
 
    case 'd':           /* toggle debug messages from the stub */
      gdb_toggle();
      break;
 
    case 'g':           /* return the value of the CPU registers */
      target_read_registers(registers);
      break;
 
    case 'G':      /* set the value of the CPU registers - return OK */
      target_write_registers(registers);
      break;
 
    case 'm':     /* mAA..AA,LLLL  Read LLLL bytes at address AA..AA */
      /* Try to read %x,%x.  */
      if (hex2int((char **)&ptr, &addr)
          && *ptr++ == ','
          && hex2int((char **)&ptr, &length)) {
        gdb_read_memory(addr, length);
      } else {
        make_return_packet(1);
      }
      break;
 
    case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
      /* Try to read '%x,%x:'.  */
      if (hex2int((char **)&ptr, &addr)
          && *ptr++ == ','
          && hex2int((char **)&ptr, &length)
          && *ptr++ == ':') {
        gdb_write_memory (addr, length, ptr);
      } else {
        make_return_packet(2);
      }
      break;
 
    case 'c':    /* cAA..AA    Continue at address AA..AA(optional) */
      /* try to read optional parameter, pc unchanged if no parm */
      if (hex2int((char **)&ptr, &addr)) {
        write_pc(registers, addr);
      }
 
      /*
       * we need to flush the instruction cache here, as we may have
       * deposited a breakpoint, and the icache probably has no way of
       * knowing that a data ref to some location may have changed
       * something that is in the instruction cache.
       */
 
      flush_i_cache();
      /* by returning, we pick up execution where we left off */
      return;
 
      /* kill the program */
    case 'k' :
      gdb_kill();
      break;
    case 'r':           /* Reset */
      target_reset();
      break;
    }                   /* switch */
 
    /* reply to the request */
    putpacket(packet_out_buf);
  }
  DEBUG (1, "Leaving handle_exception()");
}
 
/* Convert the hardware trap type code to a unix signal number. */
 
int
computeSignal(int tt)
{
  struct trap_info *ht;
 
  for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
    if (ht->tt == tt)
      return ht->signo;
 
  return SIGHUP;                /* default for things we don't know about */
}
 
/*
 * Set up exception handlers for tracing and breakpoints
 */
void
set_debug_traps()
{
  struct trap_info *ht;
 
  DEBUG (1, "Entering set_debug_traps()");
 
  if (hard_trap_info->tt == 0) {
    print ("ERROR: ARG#$@%^&*!! no hard trap info!!\r\n");
  }
 
  for (ht = hard_trap_info; ht->tt && ht->signo; ht++) {
    exception_handler(ht->tt, (unsigned long)default_trap_hook);
  }
 
  /* In case GDB is started before us, ack any packets (presumably
     "$?#xx") sitting there.  */
 
  outbyte ('+');
  initialized = 1;
 
  DEBUG (1, "Leaving set_debug_traps()");
}
 
/*
 * make a return packet.
 *      param is the value to return.
 *              0 = OK, any other value is converted to a two digit hex number.
 *      returns a string or "OK" or "ENN", where NN is the error number. Each N
 *              is an ASCII encoded hex digit.
 */
char *
make_return_packet(int val)
{
  if (val == 0) {
     packet_out_buf[0] = 'O';
     packet_out_buf[1] = 'K';
     packet_out_buf[2] = 0;
  } else {
    packet_out_buf[0] = 'E';
    packet_out_buf[1] = digit2hex((val >> 4) & 0xf);
    packet_out_buf[2] = digit2hex(val & 0xf);
    packet_out_buf[3] = 0;
  }
  return(packet_out_buf);
}
 
/*
 * g - read registers.
 *      no params.
 *      returns a vector of words, size is NUM_REGS.
 */
char *
gdb_read_registers()
{
}
 
/*
 * G - write registers.
 *      param is a vector of words, size is NUM_REGS.
 *      returns an OK or an error number.
 */
char *
gdb_write_registers(char *regs)
{
}
 
/*
 * m - read memory.
 *      params are the address to start the read at and the number of
 *              bytes to read.
 *      returns a vector of nbytes or an error number.
 *      Can be fewer bytes than requested if able to read only part of the
 *      data.
 */
char *
gdb_read_memory(long addr, int nbytes)
{
  if (mem2hex((char *)addr, packet_out_buf, nbytes, MAY_FAULT))
    return(packet_out_buf);
  else {
    return(make_return_packet(3));
  }
}
 
/*
 * M write memory
 *      params are the address to start writing to, the number of
 *              bytes to write, and the new values of the bytes.
 *      returns an OK or an error number.
 */
char *
gdb_write_memory(long addr, int nbytes, char *mem)
{
 if (hex2mem(mem, (char *)addr, nbytes, MAY_FAULT))
    return(make_return_packet(OK));
  else {
    return(make_return_packet(3));
  }
}
 
/*
 * c - continue at address.
 *      param is the address to start at, and an optional signal. If
 *              sig is zero, then ignore it.
 *      returns an OK or an error number.
 */
char *
gdb_continue(int sig, long addr)
{
}
 
/*
 * s - step instruction(s)
 *      param is the address to start at, and an optional signal. If
 *              sig is zero, then ignore it.
 *      returns an OK or an error number.
 */
char *
gdb_step(int sig, long addr)
{
}
 
/*
 * k - kill program.
 *      no params.
 *      returns an OK or an error number.
 */
char *
gdb_kill()
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * ? - last signal.
 *      no params.
 *      returns the last signal number.
 */
char *
gdb_last_signal(int val)
{
  DEBUG (1, "Entering gdb_last_signal()");
 
  packet_out_buf[0] = 'S';
  packet_out_buf[1] = digit2hex(val >> 4);
  packet_out_buf[2] = digit2hex(val & 0xf);
  packet_out_buf[3] = 0;
 
  DEBUG (1, "Leaving gdb_last_signal()");
  return (packet_out_buf);
}
 
/*
 * b - change baud rate.
 *      param is the new baudrate
 *      returns the baud rate.
 */
char *
gdb_baudrate(int baud)
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * T - dump state.
 *      no params.
 *      returns the signal number, the registers, the thread ID, and
 *              possible extensions in a vector that looks like:
 *                      TAAn...:r...;n...:r...;n...:r...; where:
 *                       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.
 */
char *
gdb_dump_state()
{
}
 
/*
 * D - host requests a detach
 *      no params.
 *      returns either a S, T, W, or X command.
 *      returns an OK or an error number.
 */
char *
gdb_detach()
{
}
 
/*
 * H - set thread.
 *      params are the command to execute and the thread ID.
 *              cmd = 'c' for thread used in step and continue;
 *              cmd = 'g' for thread used in other operations.
 *              tid = -1 for all threads.
 *              tid = zero, pick a thread,any thread.
 *      returns an OK or an error number.
 */
char *
gdb_set_thread(int cmd, int tid)
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * p - read one register.
 *      param is the register number.
 *      returns the register value or ENN.
 */
char *
gdb_read_reg(int reg)
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * P - write one register.
 *      params are the register number, and it's new value.
 *      returns the register value or ENN.
 */
char *
gdb_write_reg(int reg, long val)
{
  /* generically, we can't do anything for this command */
 
  return(make_return_packet(OK));
}
 
/*
 * W - process exited.
 *      no params.
 *      returns the exit status.
 */
char *
gdb_exited()
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * X - process terminated.
 *      no params.
 *      returns the last signal.
 */
char *
gdb_terminated()
{
}
 
/*
 * O - hex encoding.
 *      params are a vector of bytes, and the number of bytes to encode.
 *      returns a vector of ASCII encoded hex numbers.
 */
char *
gdb_hex(char *str, int nbytes)
{
}
 
/*
 * A - tread alive request.
 *      param is the thread ID.
 *      returns an OK or an error number.
 */
char *
gdb_thread_alive(int tid)
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * ! - extended protocol.
 *      no params.
 *      returns an OK or an error number.
 */
char *
gdb_extended()
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * d - toggle gdb stub diagnostics.
 *      no params.
 *      returns an OK or an error number.
 */
char *
gdb_debug()
{
  if (remote_debug > 0)
    remote_debug = 0;
  else
    remote_debug = 1;
 
  return(make_return_packet(OK));
}
 
/*
 * d - toggle gdb stub.
 *      no params.
 *      returns an OK or an error number.
 */
char *
gdb_toggle()
{
  static int level = 0;
 
  if (remote_debug) {
    level = remote_debug;
    remote_debug = 0;
  } else {
    remote_debug = level;
  }
 
  return(make_return_packet(OK));
}
 
/*
 * r - reset target
 *      no params.
 *      returns an OK or an error number.
 */
char *
gdb_reset()
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * t - search backwards.
 *      params are the address to start searching from, a pattern to match, and
 *              the mask to use.
 *      FIXME: not entirely sure what this is supposed to return.
 */
char *
gdb_search(long addr, long pat, long mask)
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * q - general get query.
 *      param is a string, that's the query to be executed.
 *      FIXME: not entirely sure what this is supposed to return.
 */
char *
gdb_get_query(char *query)
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
/*
 * Q - general set query
 *      param is a string, that's the query to be executed.
 *      FIXME: not entirely sure what this means.
 *      returns an OK or an error number.
 */
char *
gdb_set(char *query)
{
  /* generically, we can't do anything for this command */
  return(make_return_packet(OK));
}
 
 

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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [libgloss/] [debug.c] - Blame information for rev 179

Line No.	Rev	Author	Line
1	148	jeremybenn	`/*`
2			`* Copyright (c) 1995, 1996 Cygnus Support`
3			`*`
4			`* The authors hereby grant permission to use, copy, modify, distribute,`
5			`* and license this software and its documentation for any purpose, provided`
6			`* that existing copyright notices are retained in all copies and that this`
7			`* notice is included verbatim in any distributions. No written agreement,`
8			`* license, or royalty fee is required for any of the authorized uses.`
9			`* Modifications to this software may be copyrighted by their authors`
10			`* and need not follow the licensing terms described here, provided that`
11			`* the new terms are clearly indicated on the first page of each file where`
12			`* they apply.`
13			`*/`
14
15			`/*`
16			`* A debug packet whose contents are <data> looks like:`
17			`*`
18			`* $ <data> # CSUM1 CSUM2`
19			`*`
20			`* <data> must be ASCII alphanumeric and cannot include characters`
21			`* '$' or '#'. If <data> starts with two characters followed by`
22			`* ':', then the existing stubs interpret this as a sequence number.`
23			`*`
24			`* CSUM1 and CSUM2 are ascii hex representation of an 8-bit`
25			`* checksum of <data>, the most significant nibble is sent first.`
26			`* the hex digits 0-9,a-f are used.`
27			`*`
28			`* We respond with:`
29			`*`
30			`* + - if CSUM is correct and ready for next packet`
31			`* - - if CSUM is incorrect`
32			`*`
33			`* <data> is as follows:`
34			`* Most values are encoded in ascii hex digits.`
35			`*/`
36
37			`#include "debug.h"`
38			`#include <signal.h>`
39
40			`/*`
41			`* buffers that hold the packets while they're being constructed.`
42			`*/`
43			`char packet_in_buf[BUFMAX];`
44			`char packet_out_buf[BUFMAX];`
45			`int packet_index;`
46
47			`/*`
48			`* indicate to caller of mem2hex or hex2mem that there has been an error.`
49			`* 0 means ok, 1 means error`
50			`*/`
51			`volatile int mem_err = 0;`
52
53			`/*`
54			`* 1 means print debugging messages from the target, 0 means be quiet. This is`
55			`* changed by gdb_debug().`
56			`*/`
57			`int remote_debug = 0;`
58
59			`/*`
60			`* indicate whether the debug vectors ahave been initialized`
61			`* 0 means not yet, 1 means yep, it's ready.`
62			`*/`
63			`int initialized = 0;`
64
65			`/*`
66			`* These variables are instantialted in the GDB stub code.`
67			`*/`
68
69			`/* this is a list of signal to exception mappings. */`
70			`extern struct trap_info hard_trap_info[];`
71
72			`/* this is a memory fault exception handler, used by mem2hex & hex2mem */`
73			`extern void set_mem_fault_trap();`
74
75			`/*`
76			`* print debugging messages. This uses print, rather than one of the`
77			`* stdio routines, cause if there are stack or memory problems, the`
78			`* stdio routines don't work.`
79			`* params are the debug level, and the string to print`
80			`* it doesn't return anything.`
81			`*/`
82			`void`
83			`debuglog(int level, char *msg)`
84			`{`
85			`char *p;`
86			`unsigned char buf[BUFMAX];`
87			`char newmsg[BUFMAX];`
88			`int i;`
89
90			`if (level > remote_debug)`
91			`return;`
92
93			`if ((level <0) \|\| (level > 100)) {`
94			`print ("ERROR: debug print level out of range");`
95			`return;`
96			`}`
97
98			`/* convert some characters so it'll look right in the log */`
99			`p = newmsg;`
100			`for (i = 0 ; msg[i] != '\0'; i++) {`
101			`if (i > BUFMAX)`
102			`print ("\r\nERROR: Debug message too long\r\n");`
103			`switch (msg[i]) {`
104			`case '\n': /* newlines */`
105			`*p++ = '\\';`
106			`*p++ = 'n';`
107			`continue;`
108			`case '\r': /* carriage returns */`
109			`*p++ = '\\';`
110			`*p++ = 'r';`
111			`continue;`
112			`case '\033': /* escape */`
113			`*p++ = '\\';`
114			`*p++ = 'e';`
115			`continue;`
116			`case '\t': /* tab */`
117			`*p++ = '\\';`
118			`*p++ = 't';`
119			`continue;`
120			`case '\b': /* backspace */`
121			`*p++ = '\\';`
122			`*p++ = 'b';`
123			`continue;`
124			`default: /* no change */`
125			`*p++ = msg[i];`
126			`}`
127
128			`if (msg[i] < 26) { /* modify control characters */`
129			`*p++ = '^';`
130			`*p++ = msg[i] + 'A';`
131			`continue;`
132			`}`
133			`if (msg[i] >= 127) { /* modify control characters */`
134			`*p++ = '!';`
135			`*p++ = msg[i] + 'A';`
136			`continue;`
137			`}`
138			`}`
139			`p = '\0'; / terminate the string */`
140			`print (newmsg);`
141			`print ("\r\n");`
142			`}`
143
144			`/*`
145			`* convert an ascii hex digit to a number.`
146			`* param is hex digit.`
147			`* returns a decimal digit.`
148			`*/`
149			`int`
150			`hex2digit (int digit)`
151			`{`
152			`if (digit == 0)`
153			`return 0;`
154
155			`if (digit >= '0' && digit <= '9')`
156			`return digit - '0';`
157			`if (digit >= 'a' && digit <= 'f')`
158			`return digit - 'a' + 10;`
159			`if (digit >= 'A' && digit <= 'F')`
160			`return digit - 'A' + 10;`
161
162			`/* shouldn't ever get this far */`
163			`return ERROR;`
164			`}`
165
166			`/*`
167			`* convert number NIB to a hex digit.`
168			`* param is a decimal digit.`
169			`* returns a hex digit.`
170			`*/`
171			`char`
172			`digit2hex(int digit)`
173			`{`
174			`if (digit < 10)`
175			`return '0' + digit;`
176			`else`
177			`return 'a' + digit - 10;`
178			`}`
179
180			`/*`
181			`* Convert the memory pointed to by mem into hex, placing result in buf.`
182			`* Return a pointer to the last char put in buf (null), in case of mem fault,`
183			`* return 0.`
184			`* If MAY_FAULT is non-zero, then we will handle memory faults by returning`
185			`* a 0, else treat a fault like any other fault in the stub.`
186			`*/`
187			`unsigned char *`
188			`mem2hex(unsigned char mem, unsigned char buf, int count, int may_fault)`
189			`{`
190			`unsigned char ch;`
191
192			`DEBUG (1, "In mem2hex");`
193
194			`set_mem_fault_trap(MAY_FAULT);`
195
196			`while (count-- > 0) {`
197			`ch = *mem++;`
198			`if (mem_err) {`
199			`DEBUG (1, "memory fault in mem2hex");`
200			`return 0;`
201			`}`
202			`*buf++ = digit2hex(ch >> 4);`
203			`*buf++ = digit2hex(ch & 0xf);`
204			`}`
205
206			`*buf = 0;`
207
208			`set_mem_fault_trap(OK);`
209
210			`return buf;`
211			`}`
212
213			`/*`
214			`* Convert the hex array pointed to by buf into binary to be placed in mem`
215			`* return a pointer to the character AFTER the last byte written`
216			`*/`
217			`unsigned char *`
218			`hex2mem(unsigned char buf, unsigned char mem, int count, int may_fault)`
219			`{`
220			`int i;`
221			`unsigned char ch;`
222
223			`DEBUG (1, "In hex2mem");`
224
225			`set_mem_fault_trap(may_fault);`
226
227			`for (i=0; i<count; i++) {`
228			`ch = hex2digit(*buf++) << 4;`
229			`ch \|= hex2digit(*buf++);`
230			`*mem++ = ch;`
231			`if (mem_err)`
232			`return 0;`
233			`}`
234
235			`set_mem_fault_trap(0);`
236
237			`return mem;`
238			`}`
239
240			`/*`
241			`* while we find nice hex chars, build an int.`
242			`* param is a pointer to the string.`
243			`* returns the int in the param field, and the number of chars processed.`
244			`*/`
245			`int`
246			`hex2int (char *ptr, int intValue)`
247			`{`
248			`int numChars = 0;`
249			`int hexValue;`
250
251			`*intValue = 0;`
252
253			`while (**ptr)`
254			`{`
255			`hexValue = hex2digit(**ptr);`
256			`if (hexValue < 0)`
257			`break;`
258
259			`intValue = (intValue << 4) \| hexValue;`
260			`numChars ++;`
261			`(*ptr)++;`
262			`}`
263			`return (numChars);`
264			`}`
265
266			`/*`
267			`* Scan for the sequence $<data>#<checksum>`
268			`*/`
269			`void`
270			`getpacket(unsigned char *buffer)`
271			`{`
272			`unsigned char checksum;`
273			`unsigned char xmitcsum;`
274			`int i;`
275			`int count;`
276			`unsigned char ch;`
277
278			`do {`
279			`/* wait around for the start character, ignore all other characters */`
280			`while ((ch = (inbyte() & 0x7f)) != '$') ;`
281
282			`checksum = 0;`
283			`xmitcsum = -1;`
284
285			`count = 0;`
286
287			`/* now, read until a # or end of buffer is found */`
288			`while (count < BUFMAX) {`
289			`ch = inbyte() & 0x7f;`
290			`if (ch == '#')`
291			`break;`
292			`checksum = checksum + ch;`
293			`buffer[count] = ch;`
294			`count = count + 1;`
295			`}`
296
297			`if (count >= BUFMAX)`
298			`continue;`
299
300			`buffer[count] = 0;`
301
302			`if (ch == '#') {`
303			`xmitcsum = hex2digit(inbyte() & 0x7f) << 4;`
304			`xmitcsum \|= hex2digit(inbyte() & 0x7f);`
305			`#if 1`
306			`/* Humans shouldn't have to figure out checksums to type to it. */`
307			`outbyte ('+');`
308			`return;`
309			`#endif`
310			`if (checksum != xmitcsum)`
311			`outbyte('-'); /* failed checksum */`
312			`else {`
313			`outbyte('+'); /* successful transfer */`
314			`/* if a sequence char is present, reply the sequence ID */`
315			`if (buffer[2] == ':') {`
316			`outbyte(buffer[0]);`
317			`outbyte(buffer[1]);`
318			`/* remove sequence chars from buffer */`
319			`count = strlen(buffer);`
320			`for (i=3; i <= count; i++)`
321			`buffer[i-3] = buffer[i];`
322			`}`
323			`}`
324			`}`
325			`}`
326			`while (checksum != xmitcsum);`
327			`}`
328
329			`/*`
330			`* Send the packet in buffer.`
331			`*/`
332			`void`
333			`putpacket(unsigned char *buffer)`
334			`{`
335			`unsigned char checksum;`
336			`int count;`
337			`unsigned char ch;`
338
339			`/* $<packet info>#<checksum>. */`
340			`do {`
341			`outbyte('$');`
342			`checksum = 0;`
343			`count = 0;`
344
345			`while (ch = buffer[count]) {`
346			`if (! outbyte(ch))`
347			`return;`
348			`checksum += ch;`
349			`count += 1;`
350			`}`
351
352			`outbyte('#');`
353			`outbyte(digit2hex(checksum >> 4));`
354			`outbyte(digit2hex(checksum & 0xf));`
355
356			`}`
357			`while ((inbyte() & 0x7f) != '+');`
358			`}`
359
360			`/*`
361			`*`
362			`*/`
363			`void`
364			`gdb_event_loop(int sigval, unsigned long *registers)`
365			`{`
366			`int addr;`
367			`int length;`
368			`unsigned char *ptr;`
369			`ptr = packet_out_buf;`
370
371			`DEBUG (1, "In gdb_event_loop");`
372
373			`while (1) {`
374			`packet_out_buf[0] = 0;`
375
376			`getpacket(packet_in_buf);`
377			`ptr = &packet_in_buf[1];`
378
379			`switch (packet_in_buf[0]) {`
380			`case '?': /* get the last known signal */`
381			`gdb_last_signal(sigval);`
382			`break;`
383
384			`case 'd': /* toggle debug messages from the stub */`
385			`gdb_toggle();`
386			`break;`
387
388			`case 'g': /* return the value of the CPU registers */`
389			`target_read_registers(registers);`
390			`break;`
391
392			`case 'G': /* set the value of the CPU registers - return OK */`
393			`target_write_registers(registers);`
394			`break;`
395
396			`case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */`
397			`/* Try to read %x,%x. */`
398			`if (hex2int((char **)&ptr, &addr)`
399			`&& *ptr++ == ','`
400			`&& hex2int((char **)&ptr, &length)) {`
401			`gdb_read_memory(addr, length);`
402			`} else {`
403			`make_return_packet(1);`
404			`}`
405			`break;`
406
407			`case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */`
408			`/* Try to read '%x,%x:'. */`
409			`if (hex2int((char **)&ptr, &addr)`
410			`&& *ptr++ == ','`
411			`&& hex2int((char **)&ptr, &length)`
412			`&& *ptr++ == ':') {`
413			`gdb_write_memory (addr, length, ptr);`
414			`} else {`
415			`make_return_packet(2);`
416			`}`
417			`break;`
418
419			`case 'c': /* cAA..AA Continue at address AA..AA(optional) */`
420			`/* try to read optional parameter, pc unchanged if no parm */`
421			`if (hex2int((char **)&ptr, &addr)) {`
422			`write_pc(registers, addr);`
423			`}`
424
425			`/*`
426			`* we need to flush the instruction cache here, as we may have`
427			`* deposited a breakpoint, and the icache probably has no way of`
428			`* knowing that a data ref to some location may have changed`
429			`* something that is in the instruction cache.`
430			`*/`
431
432			`flush_i_cache();`
433			`/* by returning, we pick up execution where we left off */`
434			`return;`
435
436			`/* kill the program */`
437			`case 'k' :`
438			`gdb_kill();`
439			`break;`
440			`case 'r': /* Reset */`
441			`target_reset();`
442			`break;`
443			`} /* switch */`
444
445			`/* reply to the request */`
446			`putpacket(packet_out_buf);`
447			`}`
448			`DEBUG (1, "Leaving handle_exception()");`
449			`}`
450
451			`/* Convert the hardware trap type code to a unix signal number. */`
452
453			`int`
454			`computeSignal(int tt)`
455			`{`
456			`struct trap_info *ht;`
457
458			`for (ht = hard_trap_info; ht->tt && ht->signo; ht++)`
459			`if (ht->tt == tt)`
460			`return ht->signo;`
461
462			`return SIGHUP; /* default for things we don't know about */`
463			`}`
464
465			`/*`
466			`* Set up exception handlers for tracing and breakpoints`
467			`*/`
468			`void`
469			`set_debug_traps()`
470			`{`
471			`struct trap_info *ht;`
472
473			`DEBUG (1, "Entering set_debug_traps()");`
474
475			`if (hard_trap_info->tt == 0) {`
476			`print ("ERROR: ARG#$@%^&*!! no hard trap info!!\r\n");`
477			`}`
478
479			`for (ht = hard_trap_info; ht->tt && ht->signo; ht++) {`
480			`exception_handler(ht->tt, (unsigned long)default_trap_hook);`
481			`}`
482
483			`/* In case GDB is started before us, ack any packets (presumably`
484			`"$?#xx") sitting there. */`
485
486			`outbyte ('+');`
487			`initialized = 1;`
488
489			`DEBUG (1, "Leaving set_debug_traps()");`
490			`}`
491
492			`/*`
493			`* make a return packet.`
494			`* param is the value to return.`
495			`* 0 = OK, any other value is converted to a two digit hex number.`
496			`* returns a string or "OK" or "ENN", where NN is the error number. Each N`
497			`* is an ASCII encoded hex digit.`
498			`*/`
499			`char *`
500			`make_return_packet(int val)`
501			`{`
502			`if (val == 0) {`
503			`packet_out_buf[0] = 'O';`
504			`packet_out_buf[1] = 'K';`
505			`packet_out_buf[2] = 0;`
506			`} else {`
507			`packet_out_buf[0] = 'E';`
508			`packet_out_buf[1] = digit2hex((val >> 4) & 0xf);`
509			`packet_out_buf[2] = digit2hex(val & 0xf);`
510			`packet_out_buf[3] = 0;`
511			`}`
512			`return(packet_out_buf);`
513			`}`
514
515			`/*`
516			`* g - read registers.`
517			`* no params.`
518			`* returns a vector of words, size is NUM_REGS.`
519			`*/`
520			`char *`
521			`gdb_read_registers()`
522			`{`
523			`}`
524
525			`/*`
526			`* G - write registers.`
527			`* param is a vector of words, size is NUM_REGS.`
528			`* returns an OK or an error number.`
529			`*/`
530			`char *`
531			`gdb_write_registers(char *regs)`
532			`{`
533			`}`
534
535			`/*`
536			`* m - read memory.`
537			`* params are the address to start the read at and the number of`
538			`* bytes to read.`
539			`* returns a vector of nbytes or an error number.`
540			`* Can be fewer bytes than requested if able to read only part of the`
541			`* data.`
542			`*/`
543			`char *`
544			`gdb_read_memory(long addr, int nbytes)`
545			`{`
546			`if (mem2hex((char *)addr, packet_out_buf, nbytes, MAY_FAULT))`
547			`return(packet_out_buf);`
548			`else {`
549			`return(make_return_packet(3));`
550			`}`
551			`}`
552
553			`/*`
554			`* M write memory`
555			`* params are the address to start writing to, the number of`
556			`* bytes to write, and the new values of the bytes.`
557			`* returns an OK or an error number.`
558			`*/`
559			`char *`
560			`gdb_write_memory(long addr, int nbytes, char *mem)`
561			`{`
562			`if (hex2mem(mem, (char *)addr, nbytes, MAY_FAULT))`
563			`return(make_return_packet(OK));`
564			`else {`
565			`return(make_return_packet(3));`
566			`}`
567			`}`
568
569			`/*`
570			`* c - continue at address.`
571			`* param is the address to start at, and an optional signal. If`
572			`* sig is zero, then ignore it.`
573			`* returns an OK or an error number.`
574			`*/`
575			`char *`
576			`gdb_continue(int sig, long addr)`
577			`{`
578			`}`
579
580			`/*`
581			`* s - step instruction(s)`
582			`* param is the address to start at, and an optional signal. If`
583			`* sig is zero, then ignore it.`
584			`* returns an OK or an error number.`
585			`*/`
586			`char *`
587			`gdb_step(int sig, long addr)`
588			`{`
589			`}`
590
591			`/*`
592			`* k - kill program.`
593			`* no params.`
594			`* returns an OK or an error number.`
595			`*/`
596			`char *`
597			`gdb_kill()`
598			`{`
599			`/* generically, we can't do anything for this command */`
600			`return(make_return_packet(OK));`
601			`}`
602
603			`/*`
604			`* ? - last signal.`
605			`* no params.`
606			`* returns the last signal number.`
607			`*/`
608			`char *`
609			`gdb_last_signal(int val)`
610			`{`
611			`DEBUG (1, "Entering gdb_last_signal()");`
612
613			`packet_out_buf[0] = 'S';`
614			`packet_out_buf[1] = digit2hex(val >> 4);`
615			`packet_out_buf[2] = digit2hex(val & 0xf);`
616			`packet_out_buf[3] = 0;`
617
618			`DEBUG (1, "Leaving gdb_last_signal()");`
619			`return (packet_out_buf);`
620			`}`
621
622			`/*`
623			`* b - change baud rate.`
624			`* param is the new baudrate`
625			`* returns the baud rate.`
626			`*/`
627			`char *`
628			`gdb_baudrate(int baud)`
629			`{`
630			`/* generically, we can't do anything for this command */`
631			`return(make_return_packet(OK));`
632			`}`
633
634			`/*`
635			`* T - dump state.`
636			`* no params.`
637			`* returns the signal number, the registers, the thread ID, and`
638			`* possible extensions in a vector that looks like:`
639			`* TAAn...:r...;n...:r...;n...:r...; where:`
640			`* AA = signal number`
641			`* n... = register number (hex)`
642			`* r... = register contents`
643			* n... = `thread'
644			`* r... = thread process ID. This is a hex integer.`
645			`* n... = other string not starting with valid hex digit.`
646			`* gdb should ignore this n,r pair and go on to`
647			`* the next. This way we can extend the protocol.`
648			`*/`
649			`char *`
650			`gdb_dump_state()`
651			`{`
652			`}`
653
654			`/*`
655			`* D - host requests a detach`
656			`* no params.`
657			`* returns either a S, T, W, or X command.`
658			`* returns an OK or an error number.`
659			`*/`
660			`char *`
661			`gdb_detach()`
662			`{`
663			`}`
664
665			`/*`
666			`* H - set thread.`
667			`* params are the command to execute and the thread ID.`
668			`* cmd = 'c' for thread used in step and continue;`
669			`* cmd = 'g' for thread used in other operations.`
670			`* tid = -1 for all threads.`
671			`* tid = zero, pick a thread,any thread.`
672			`* returns an OK or an error number.`
673			`*/`
674			`char *`
675			`gdb_set_thread(int cmd, int tid)`
676			`{`
677			`/* generically, we can't do anything for this command */`
678			`return(make_return_packet(OK));`
679			`}`
680
681			`/*`
682			`* p - read one register.`
683			`* param is the register number.`
684			`* returns the register value or ENN.`
685			`*/`
686			`char *`
687			`gdb_read_reg(int reg)`
688			`{`
689			`/* generically, we can't do anything for this command */`
690			`return(make_return_packet(OK));`
691			`}`
692
693			`/*`
694			`* P - write one register.`
695			`* params are the register number, and it's new value.`
696			`* returns the register value or ENN.`
697			`*/`
698			`char *`
699			`gdb_write_reg(int reg, long val)`
700			`{`
701			`/* generically, we can't do anything for this command */`
702
703			`return(make_return_packet(OK));`
704			`}`
705
706			`/*`
707			`* W - process exited.`
708			`* no params.`
709			`* returns the exit status.`
710			`*/`
711			`char *`
712			`gdb_exited()`
713			`{`
714			`/* generically, we can't do anything for this command */`
715			`return(make_return_packet(OK));`
716			`}`
717
718			`/*`
719			`* X - process terminated.`
720			`* no params.`
721			`* returns the last signal.`
722			`*/`
723			`char *`
724			`gdb_terminated()`
725			`{`
726			`}`
727
728			`/*`
729			`* O - hex encoding.`
730			`* params are a vector of bytes, and the number of bytes to encode.`
731			`* returns a vector of ASCII encoded hex numbers.`
732			`*/`
733			`char *`
734			`gdb_hex(char *str, int nbytes)`
735			`{`
736			`}`
737
738			`/*`
739			`* A - tread alive request.`
740			`* param is the thread ID.`
741			`* returns an OK or an error number.`
742			`*/`
743			`char *`
744			`gdb_thread_alive(int tid)`
745			`{`
746			`/* generically, we can't do anything for this command */`
747			`return(make_return_packet(OK));`
748			`}`
749
750			`/*`
751			`* ! - extended protocol.`
752			`* no params.`
753			`* returns an OK or an error number.`
754			`*/`
755			`char *`
756			`gdb_extended()`
757			`{`
758			`/* generically, we can't do anything for this command */`
759			`return(make_return_packet(OK));`
760			`}`
761
762			`/*`
763			`* d - toggle gdb stub diagnostics.`
764			`* no params.`
765			`* returns an OK or an error number.`
766			`*/`
767			`char *`
768			`gdb_debug()`
769			`{`
770			`if (remote_debug > 0)`
771			`remote_debug = 0;`
772			`else`
773			`remote_debug = 1;`
774
775			`return(make_return_packet(OK));`
776			`}`
777
778			`/*`
779			`* d - toggle gdb stub.`
780			`* no params.`
781			`* returns an OK or an error number.`
782			`*/`
783			`char *`
784			`gdb_toggle()`
785			`{`
786			`static int level = 0;`
787
788			`if (remote_debug) {`
789			`level = remote_debug;`
790			`remote_debug = 0;`
791			`} else {`
792			`remote_debug = level;`
793			`}`
794
795			`return(make_return_packet(OK));`
796			`}`
797
798			`/*`
799			`* r - reset target`
800			`* no params.`
801			`* returns an OK or an error number.`
802			`*/`
803			`char *`
804			`gdb_reset()`
805			`{`
806			`/* generically, we can't do anything for this command */`
807			`return(make_return_packet(OK));`
808			`}`
809
810			`/*`
811			`* t - search backwards.`
812			`* params are the address to start searching from, a pattern to match, and`
813			`* the mask to use.`
814			`* FIXME: not entirely sure what this is supposed to return.`
815			`*/`
816			`char *`
817			`gdb_search(long addr, long pat, long mask)`
818			`{`
819			`/* generically, we can't do anything for this command */`
820			`return(make_return_packet(OK));`
821			`}`
822
823			`/*`
824			`* q - general get query.`
825			`* param is a string, that's the query to be executed.`
826			`* FIXME: not entirely sure what this is supposed to return.`
827			`*/`
828			`char *`
829			`gdb_get_query(char *query)`
830			`{`
831			`/* generically, we can't do anything for this command */`
832			`return(make_return_packet(OK));`
833			`}`
834
835			`/*`
836			`* Q - general set query`
837			`* param is a string, that's the query to be executed.`
838			`* FIXME: not entirely sure what this means.`
839			`* returns an OK or an error number.`
840			`*/`
841			`char *`
842			`gdb_set(char *query)`
843			`{`
844			`/* generically, we can't do anything for this command */`
845			`return(make_return_packet(OK));`
846			`}`
847
848