849 lines
18 KiB
C
849 lines
18 KiB
C
/*
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* Copyright (c) 1995, 1996 Cygnus Support
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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/*
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* A debug packet whose contents are <data> looks like:
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*
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* $ <data> # CSUM1 CSUM2
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*
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* <data> must be ASCII alphanumeric and cannot include characters
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* '$' or '#'. If <data> starts with two characters followed by
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* ':', then the existing stubs interpret this as a sequence number.
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*
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* CSUM1 and CSUM2 are ascii hex representation of an 8-bit
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* checksum of <data>, the most significant nibble is sent first.
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* the hex digits 0-9,a-f are used.
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*
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* We respond with:
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*
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* + - if CSUM is correct and ready for next packet
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* - - if CSUM is incorrect
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*
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* <data> is as follows:
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* Most values are encoded in ascii hex digits.
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*/
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#include "debug.h"
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#include <signal.h>
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/*
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* buffers that hold the packets while they're being constructed.
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*/
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char packet_in_buf[BUFMAX];
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char packet_out_buf[BUFMAX];
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int packet_index;
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/*
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* indicate to caller of mem2hex or hex2mem that there has been an error.
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* 0 means ok, 1 means error
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*/
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volatile int mem_err = 0;
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/*
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* 1 means print debugging messages from the target, 0 means be quiet. This is
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* changed by gdb_debug().
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*/
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int remote_debug = 0;
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/*
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* indicate whether the debug vectors ahave been initialized
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* 0 means not yet, 1 means yep, it's ready.
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*/
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int initialized = 0;
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/*
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* These variables are instantialted in the GDB stub code.
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*/
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/* this is a list of signal to exception mappings. */
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extern struct trap_info hard_trap_info[];
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/* this is a memory fault exception handler, used by mem2hex & hex2mem */
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extern void set_mem_fault_trap();
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/*
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* print debugging messages. This uses print, rather than one of the
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* stdio routines, cause if there are stack or memory problems, the
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* stdio routines don't work.
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* params are the debug level, and the string to print
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* it doesn't return anything.
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*/
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void
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debuglog(int level, char *msg)
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{
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char *p;
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unsigned char buf[BUFMAX];
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char newmsg[BUFMAX];
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int i;
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if (level > remote_debug)
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return;
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if ((level <0) || (level > 100)) {
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print ("ERROR: debug print level out of range");
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return;
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}
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/* convert some characters so it'll look right in the log */
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p = newmsg;
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for (i = 0 ; msg[i] != '\0'; i++) {
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if (i > BUFMAX)
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print ("\r\nERROR: Debug message too long\r\n");
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switch (msg[i]) {
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case '\n': /* newlines */
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*p++ = '\\';
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*p++ = 'n';
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continue;
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case '\r': /* carriage returns */
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*p++ = '\\';
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*p++ = 'r';
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continue;
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case '\033': /* escape */
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*p++ = '\\';
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*p++ = 'e';
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continue;
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case '\t': /* tab */
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*p++ = '\\';
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*p++ = 't';
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continue;
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case '\b': /* backspace */
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*p++ = '\\';
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*p++ = 'b';
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continue;
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default: /* no change */
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*p++ = msg[i];
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}
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if (msg[i] < 26) { /* modify control characters */
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*p++ = '^';
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*p++ = msg[i] + 'A';
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continue;
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}
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if (msg[i] >= 127) { /* modify control characters */
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*p++ = '!';
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*p++ = msg[i] + 'A';
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continue;
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}
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}
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*p = '\0'; /* terminate the string */
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print (newmsg);
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print ("\r\n");
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}
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/*
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* convert an ascii hex digit to a number.
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* param is hex digit.
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* returns a decimal digit.
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*/
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int
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hex2digit (int digit)
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{
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if (digit == 0)
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return 0;
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if (digit >= '0' && digit <= '9')
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return digit - '0';
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if (digit >= 'a' && digit <= 'f')
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return digit - 'a' + 10;
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if (digit >= 'A' && digit <= 'F')
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return digit - 'A' + 10;
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/* shouldn't ever get this far */
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return ERROR;
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}
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/*
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* convert number NIB to a hex digit.
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* param is a decimal digit.
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* returns a hex digit.
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*/
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char
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digit2hex(int digit)
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{
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if (digit < 10)
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return '0' + digit;
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else
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return 'a' + digit - 10;
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}
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/*
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* Convert the memory pointed to by mem into hex, placing result in buf.
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* Return a pointer to the last char put in buf (null), in case of mem fault,
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* return 0.
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* If MAY_FAULT is non-zero, then we will handle memory faults by returning
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* a 0, else treat a fault like any other fault in the stub.
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*/
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unsigned char *
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mem2hex(unsigned char *mem, unsigned char *buf, int count, int may_fault)
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{
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unsigned char ch;
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DEBUG (1, "In mem2hex");
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set_mem_fault_trap(MAY_FAULT);
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while (count-- > 0) {
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ch = *mem++;
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if (mem_err) {
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DEBUG (1, "memory fault in mem2hex");
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return 0;
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}
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*buf++ = digit2hex(ch >> 4);
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*buf++ = digit2hex(ch & 0xf);
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}
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*buf = 0;
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set_mem_fault_trap(OK);
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return buf;
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}
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/*
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* Convert the hex array pointed to by buf into binary to be placed in mem
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* return a pointer to the character AFTER the last byte written
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*/
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unsigned char *
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hex2mem(unsigned char *buf, unsigned char *mem, int count, int may_fault)
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{
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int i;
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unsigned char ch;
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DEBUG (1, "In hex2mem");
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set_mem_fault_trap(may_fault);
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for (i=0; i<count; i++) {
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ch = hex2digit(*buf++) << 4;
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ch |= hex2digit(*buf++);
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*mem++ = ch;
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if (mem_err)
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return 0;
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}
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set_mem_fault_trap(0);
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return mem;
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}
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/*
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* while we find nice hex chars, build an int.
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* param is a pointer to the string.
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* returns the int in the param field, and the number of chars processed.
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*/
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int
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hex2int (char **ptr, int *intValue)
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{
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int numChars = 0;
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int hexValue;
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*intValue = 0;
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while (**ptr)
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{
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hexValue = hex2digit(**ptr);
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if (hexValue < 0)
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break;
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*intValue = (*intValue << 4) | hexValue;
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numChars ++;
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(*ptr)++;
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}
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return (numChars);
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}
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/*
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* Scan for the sequence $<data>#<checksum>
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*/
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void
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getpacket(unsigned char *buffer)
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{
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unsigned char checksum;
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unsigned char xmitcsum;
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int i;
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int count;
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unsigned char ch;
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do {
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/* wait around for the start character, ignore all other characters */
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while ((ch = (inbyte() & 0x7f)) != '$') ;
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checksum = 0;
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xmitcsum = -1;
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count = 0;
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/* now, read until a # or end of buffer is found */
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while (count < BUFMAX) {
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ch = inbyte() & 0x7f;
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if (ch == '#')
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break;
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checksum = checksum + ch;
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buffer[count] = ch;
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count = count + 1;
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}
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if (count >= BUFMAX)
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continue;
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buffer[count] = 0;
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if (ch == '#') {
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xmitcsum = hex2digit(inbyte() & 0x7f) << 4;
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xmitcsum |= hex2digit(inbyte() & 0x7f);
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#if 1
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/* Humans shouldn't have to figure out checksums to type to it. */
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outbyte ('+');
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return;
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#endif
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if (checksum != xmitcsum)
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outbyte('-'); /* failed checksum */
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else {
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outbyte('+'); /* successful transfer */
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/* if a sequence char is present, reply the sequence ID */
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if (buffer[2] == ':') {
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outbyte(buffer[0]);
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outbyte(buffer[1]);
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/* remove sequence chars from buffer */
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count = strlen(buffer);
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for (i=3; i <= count; i++)
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buffer[i-3] = buffer[i];
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}
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}
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}
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}
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while (checksum != xmitcsum);
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}
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/*
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* Send the packet in buffer.
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*/
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void
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putpacket(unsigned char *buffer)
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{
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unsigned char checksum;
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int count;
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unsigned char ch;
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/* $<packet info>#<checksum>. */
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do {
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outbyte('$');
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checksum = 0;
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count = 0;
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while (ch = buffer[count]) {
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if (! outbyte(ch))
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return;
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checksum += ch;
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count += 1;
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}
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outbyte('#');
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outbyte(digit2hex(checksum >> 4));
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outbyte(digit2hex(checksum & 0xf));
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}
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while ((inbyte() & 0x7f) != '+');
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}
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/*
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*
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*/
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void
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gdb_event_loop(int sigval, unsigned long *registers)
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{
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int addr;
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int length;
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unsigned char *ptr;
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ptr = packet_out_buf;
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DEBUG (1, "In gdb_event_loop");
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while (1) {
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packet_out_buf[0] = 0;
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getpacket(packet_in_buf);
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ptr = &packet_in_buf[1];
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switch (packet_in_buf[0]) {
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case '?': /* get the last known signal */
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gdb_last_signal(sigval);
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break;
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case 'd': /* toggle debug messages from the stub */
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gdb_toggle();
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break;
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case 'g': /* return the value of the CPU registers */
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target_read_registers(registers);
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break;
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case 'G': /* set the value of the CPU registers - return OK */
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target_write_registers(registers);
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break;
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case 'm': /* mAA..AA,LLLL Read LLLL bytes at address AA..AA */
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/* Try to read %x,%x. */
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if (hex2int((char **)&ptr, &addr)
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&& *ptr++ == ','
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&& hex2int((char **)&ptr, &length)) {
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gdb_read_memory(addr, length);
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} else {
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make_return_packet(1);
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}
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break;
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case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
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/* Try to read '%x,%x:'. */
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if (hex2int((char **)&ptr, &addr)
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&& *ptr++ == ','
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&& hex2int((char **)&ptr, &length)
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&& *ptr++ == ':') {
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gdb_write_memory (addr, length, ptr);
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} else {
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make_return_packet(2);
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}
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break;
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case 'c': /* cAA..AA Continue at address AA..AA(optional) */
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/* try to read optional parameter, pc unchanged if no parm */
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if (hex2int((char **)&ptr, &addr)) {
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write_pc(registers, addr);
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}
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/*
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* we need to flush the instruction cache here, as we may have
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* deposited a breakpoint, and the icache probably has no way of
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* knowing that a data ref to some location may have changed
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* something that is in the instruction cache.
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*/
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flush_i_cache();
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/* by returning, we pick up execution where we left off */
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return;
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/* kill the program */
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case 'k' :
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gdb_kill();
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break;
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case 'r': /* Reset */
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target_reset();
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break;
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} /* switch */
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/* reply to the request */
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putpacket(packet_out_buf);
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}
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DEBUG (1, "Leaving handle_exception()");
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}
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/* Convert the hardware trap type code to a unix signal number. */
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int
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computeSignal(int tt)
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{
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struct trap_info *ht;
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for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
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if (ht->tt == tt)
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return ht->signo;
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return SIGHUP; /* default for things we don't know about */
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}
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|
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/*
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* Set up exception handlers for tracing and breakpoints
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*/
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void
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set_debug_traps()
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{
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struct trap_info *ht;
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DEBUG (1, "Entering set_debug_traps()");
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if (hard_trap_info->tt == 0) {
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print ("ERROR: ARG#$@%^&*!! no hard trap info!!\r\n");
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}
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for (ht = hard_trap_info; ht->tt && ht->signo; ht++) {
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exception_handler(ht->tt, (unsigned long)default_trap_hook);
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}
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|
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/* In case GDB is started before us, ack any packets (presumably
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"$?#xx") sitting there. */
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outbyte ('+');
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initialized = 1;
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DEBUG (1, "Leaving set_debug_traps()");
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}
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|
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/*
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* make a return packet.
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* param is the value to return.
|
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* 0 = OK, any other value is converted to a two digit hex number.
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* returns a string or "OK" or "ENN", where NN is the error number. Each N
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* is an ASCII encoded hex digit.
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*/
|
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char *
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make_return_packet(int val)
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{
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if (val == 0) {
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packet_out_buf[0] = 'O';
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packet_out_buf[1] = 'K';
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packet_out_buf[2] = 0;
|
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} else {
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packet_out_buf[0] = 'E';
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packet_out_buf[1] = digit2hex((val >> 4) & 0xf);
|
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packet_out_buf[2] = digit2hex(val & 0xf);
|
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packet_out_buf[3] = 0;
|
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}
|
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return(packet_out_buf);
|
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}
|
|
|
|
/*
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* g - read registers.
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* no params.
|
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* returns a vector of words, size is NUM_REGS.
|
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*/
|
|
char *
|
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gdb_read_registers()
|
|
{
|
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}
|
|
|
|
/*
|
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* G - write registers.
|
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* param is a vector of words, size is NUM_REGS.
|
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* returns an OK or an error number.
|
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*/
|
|
char *
|
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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 *
|
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gdb_read_memory(long addr, int nbytes)
|
|
{
|
|
if (mem2hex((char *)addr, packet_out_buf, nbytes, MAY_FAULT))
|
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return(packet_out_buf);
|
|
else {
|
|
return(make_return_packet(3));
|
|
}
|
|
}
|
|
|
|
/*
|
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* M write memory
|
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* params are the address to start writing to, the number of
|
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* bytes to write, and the new values of the bytes.
|
|
* returns an OK or an error number.
|
|
*/
|
|
char *
|
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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 its 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));
|
|
}
|
|
|
|
|