508 lines
8.5 KiB
C
508 lines
8.5 KiB
C
/* $Header$ */
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#define DEBUGGEE
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#include "message.h"
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#define MAXBP 128
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#define MAXTRACE 16
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static int nbp; /* # of breakpoints */
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static char *bp[MAXBP];
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static int ntrace;
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static struct trace {
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char *begin_trace, *end_trace;
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} trace_buf[MAXTRACE];
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static struct message_hdr ok_message;
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#define OFF 0
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#define SS 1 /* single stepping */
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#define SSF 2 /* single stepping, counting functions
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as single statements */
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static char *
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BUFTOA(p)
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register char *p;
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{
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register long l = 0;
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register int i;
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for (i = PS; i>0; i--) {
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l = (l << 8) | (*p++ & 0377);
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}
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return (char *) l;
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}
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static long
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BUFTOL(p)
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register char *p;
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{
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register long l = 0;
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register int i;
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for (i = LS; i>0; i--) {
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l = (l << 8) | (*p++ & 0377);
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}
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return l;
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}
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static
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ATOBUF(p, cp)
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register char *p;
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char *cp;
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{
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register int i;
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register long l = (long) cp;
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p += PS;
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for (i = PS; i > 0; i--) {
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*--p = l;
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l >>= 8;
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}
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}
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static
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LTOBUF(p, l)
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register char *p;
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register long l;
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{
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register int i;
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p += LS;
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for (i = LS; i > 0; i--) {
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*--p = l;
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l >>= 8;
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}
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}
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static int single_stepping = OFF;
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static int db_ss = 0;
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static int step_count = 0;
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static char *savedlb;
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static int break_flag = 0;
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static int reading = 0;
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static char *retaddr;
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static char *LB;
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static char *currbrk;
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extern char *__Get_LB();
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extern char *__Get_Hol0();
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extern char *__Get_PC();
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extern char *__Cvt_LB_AB();
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extern char *__Get_HP();
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extern char *_sbrk();
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extern int etext;
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extern __Set_PC();
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static send_ok();
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#define check_ptr(c) (((c) >= (char *)&etext && (c) <= currbrk) || (c) >= LB)
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#define IN_FD 3
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#define OUT_FD 6
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static int
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ureceive(p, c)
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char *p;
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long c;
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{
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int i;
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int retval = 1;
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reading = 1;
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while (c >= 0x1000) {
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i = _read(IN_FD, p, 0x1000);
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if (i == 0) return 0;
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if (i < 0) {
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retval = 0;
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c -= 0x1000;
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}
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else {
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p += i;
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c -= i;
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}
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}
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while (c > 0) {
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i = _read(IN_FD, p, (int)c);
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if (i == 0) return 0;
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if (i < 0) {
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retval = 0;
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break;
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}
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else {
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p += i;
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c -= i;
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}
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}
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reading = 0;
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return retval;
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}
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static int
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usend(p, c)
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char *p;
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long c;
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{
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int i;
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while (c >= 0x1000) {
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i = _write(OUT_FD, p, 0x1000);
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if (i < 0) {
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return 0;
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}
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p += i;
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c -= i;
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}
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while (c > 0) {
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i = _write(OUT_FD, p, (int)c);
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if (i < 0) {
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return 0;
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}
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p += i;
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c -= i;
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}
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return 1;
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}
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static int
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ugetm(message)
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struct message_hdr *message;
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{
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if (! ureceive((char *) message, (long) sizeof(struct message_hdr))) {
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return 0;
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}
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return 1;
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}
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static int
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uputm(message)
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struct message_hdr *message;
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{
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if (! usend((char *) message, (long) sizeof(struct message_hdr))) {
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return 0;
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}
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return 1;
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}
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static int
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sendreply(m, p, sz)
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struct message_hdr *m;
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char *p;
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long sz;
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{
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if (! uputm(m) || ! (sz && p ? usend(p, sz) : 1)) {
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return 0;
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}
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return 1;
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}
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static int
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do_request()
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{
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/* obtain a request from the debugger and perform it */
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int fail = 0;
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register int i;
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register char *c;
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char *c1;
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long sz;
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struct message_hdr message;
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start:
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if (! ugetm(&message)) {
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/* failed to get a message. Something is wrong. Let process continue */
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return 1;
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}
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if (message.m_type & M_DB_SS) db_ss = 1;
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message.m_type &= 0177;
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switch(message.m_type) {
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case M_OK:
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/* sometimes sent to child to see if it lives */
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goto start;
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case M_SETBP:
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/* set a breakpoint */
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if (nbp == MAXBP) {
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fail = 1;
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break;
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}
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bp[nbp++] = BUFTOA(message.m_buf+1);
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break;
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case M_SETTRACE:
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if (ntrace == MAXTRACE) {
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fail = 1;
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break;
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}
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trace_buf[ntrace].begin_trace = BUFTOA(message.m_buf+1);
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trace_buf[ntrace++].end_trace = BUFTOA(message.m_buf+(PS+1));
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break;
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case M_CLRBP:
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i = 0;
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c = BUFTOA(message.m_buf+1);
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while (i < nbp && bp[i] != c) {
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i++;
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}
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if (i < nbp) {
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while (i < nbp) {
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bp[i] = bp[i+1];
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i++;
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}
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nbp--;
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}
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else {
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fail = 1;
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}
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break;
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case M_CLRTRACE:
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i = 0;
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c = BUFTOA(message.m_buf+1);
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c1 = BUFTOA(message.m_buf+(PS+1));
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while (i < ntrace &&
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trace_buf[i].begin_trace != c &&
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trace_buf[i].end_trace != c1){
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i++;
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}
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if (i < ntrace) {
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while (i < ntrace) {
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trace_buf[i] = trace_buf[i+1];
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i++;
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}
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ntrace--;
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}
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else {
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fail = 1;
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}
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break;
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case M_SETSS:
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single_stepping = SS;
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step_count = BUFTOL(message.m_buf+1);
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return 1;
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case M_CLRSS:
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single_stepping = OFF;
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break;
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case M_SETSSF:
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savedlb = __Get_LB(2);
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step_count = BUFTOL(message.m_buf+1);
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single_stepping = SSF;
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return 1;
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case M_GETBYTES:
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message.m_type = M_DATA;
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sz = BUFTOL(message.m_buf+1);
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c = BUFTOA(message.m_buf+(LS+1));
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currbrk = _sbrk(0);
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if (! check_ptr(c) || ! check_ptr(c+sz-1)) {
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fail = 1;
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break;
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}
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return sendreply(&message, c, sz)
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? 0
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: -1;
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case M_GETSTR:
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sz = BUFTOL(message.m_buf+1);
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c1 = c = BUFTOA(message.m_buf+(LS+1));
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currbrk = _sbrk(0);
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if (check_ptr(c)) {
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while (*c) {
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if (c - c1 + 1 >= sz) break;
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c++;
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if (! check_ptr(c)) {
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fail = 1;
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break;
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}
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}
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}
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else fail = 1;
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if (fail) break;
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message.m_type = M_DATA;
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sz = c - c1 + 1;
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LTOBUF(message.m_buf+1, sz);
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return sendreply(&message, c1, sz)
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? 0
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: -1;
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case M_SETBYTES:
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if (! ureceive(BUFTOA(message.m_buf+(LS+1)), BUFTOL(message.m_buf+1))) {
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fail = 1;
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}
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break;
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case M_GETEMREGS:
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i = BUFTOL(message.m_buf+1);
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c = __Get_LB(i+2); /* local base */
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c1 = __Get_LB(i+1); /* needed to find PC and SP */
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ATOBUF(message.m_buf+LB_OFF, c);
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ATOBUF(message.m_buf+AB_OFF, __Cvt_LB_AB(c));
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ATOBUF(message.m_buf+PC_OFF, __Get_PC(c1));
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ATOBUF(message.m_buf+HP_OFF, __Get_HP());
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ATOBUF(message.m_buf+SP_OFF, __Cvt_LB_AB(c1));
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return sendreply(&message, (char *) 0, 0L) ? 0 : -1;
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case M_SETEMREGS:
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/* actually, only the program counter is settable */
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i = BUFTOL(message.m_buf+1);
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c = __Get_LB(i+1);
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__Set_PC(c, BUFTOA(message.m_buf+PC_OFF));
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break;
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case M_CONT:
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return 1;
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case M_DUMP:
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currbrk = _sbrk(0);
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c = __Get_Hol0();
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c1 = currbrk;
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message.m_type = M_DGLOB;
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sz = c1 - c;
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LTOBUF(message.m_buf+1, sz);
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ATOBUF(message.m_buf + HP_OFF, __Get_HP());
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ATOBUF(message.m_buf + PC_OFF, __Get_PC(__Get_LB(1)));
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ATOBUF(message.m_buf + LB_OFF, c1);
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sendreply(&message, c, sz);
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if (! ___topsave()) {
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/* we get here after a ___topload() ! */
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step_count = 0;
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nbp = 0;
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single_stepping = 0;
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savedlb = 0;
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break_flag = 0;
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db_ss = 0;
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break;
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}
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return 0;
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case M_DGLOB:
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_brk(BUFTOA(message.m_buf + LB_OFF));
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__Set_HP(BUFTOA(message.m_buf+HP_OFF));
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if (! ureceive(__Get_Hol0(), BUFTOL(message.m_buf+1))) {}
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___topload(BUFTOA(message.m_buf + SP_OFF));
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/*NOTREACHED*/
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}
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send_ok(fail ? M_FAIL : M_OK);
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return fail ? -1 : 0;
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}
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___sendtop(addr, SP, sz)
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char *addr, *SP;
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unsigned sz;
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{
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struct message_hdr m;
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m.m_type = M_DSTACK;
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LTOBUF(m.m_buf+1, (long) sz);
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ATOBUF(m.m_buf+SP_OFF, SP);
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sendreply(&m, addr, (long)sz);
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}
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___restoretop(SP)
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char *SP;
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{
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struct message_hdr m;
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if (! ugetm(&m)) {}
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if (! ureceive(SP, BUFTOL(m.m_buf+1))) {}
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}
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static
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sigcatch()
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{
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signal(7, sigcatch);
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if (reading) send_ok(M_INTR);
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else break_flag = 1;
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db_ss = 0;
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}
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static int
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check_bp()
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{
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register int i;
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for (i = 0; i < nbp; i++) {
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if (bp[i] == retaddr) {
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return 1;
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}
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}
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return 0;
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}
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static int
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check_trace()
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{
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register int i;
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for (i = 0; i < ntrace; i++) {
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if (trace_buf[i].begin_trace <= retaddr &&
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trace_buf[i].end_trace >= retaddr) {
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return 1;
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}
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}
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return 0;
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}
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static
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send_ok(type)
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{
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register int i;
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ok_message.m_type = type;
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LTOBUF(ok_message.m_buf+1, (long) retaddr);
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uputm(&ok_message);
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}
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void
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__uX_LiB()
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/* This function must be called after every LIN and LNI */
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{
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int status = M_CONT;
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LB = __Get_LB(0);
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if ( retaddr) {
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/* not the first time ... */
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retaddr = __Get_PC(LB);
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/* first, adjust step_count when single stepping
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*/
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if (single_stepping == SS) step_count--;
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else if (single_stepping == SSF) {
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char *lb = __Get_LB(1);
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if (!((char *) &lb < lb && lb >= savedlb ||
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(char *) &lb > lb && lb <= savedlb)) {
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}
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else {
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savedlb = lb;
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step_count--;
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}
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}
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if (single_stepping != OFF && step_count <= 0) {
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status = M_END_SS;
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single_stepping = OFF;
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}
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else if (break_flag) status = M_INTR;
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}
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else {
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signal(7, sigcatch);
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retaddr = __Get_PC(LB);
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status = M_OK;
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}
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if (status == M_CONT) {
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if ((nbp != 0 && check_bp() != 0) ||
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(ntrace != 0 && check_trace() != 0)) {
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status = M_OK;
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}
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else if (break_flag) status = M_INTR;
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else {
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if (db_ss) {
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db_ss = 0;
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send_ok(M_DB_SS);
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while (do_request() <= 0) /* nothing */;
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}
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if (break_flag) status = M_INTR;
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else return;
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}
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}
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break_flag = 0;
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send_ok(status);
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db_ss = 0;
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while (do_request() <= 0) /* nothing */;
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}
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