xmon.c

linux-2.6.15.6

void
byterev(unsigned char *val, int size)
{
	int t;
	
	switch (size) {
	case 2:
		SWAP(val[0], val[1], t);
		break;
	case 4:
		SWAP(val[0], val[3], t);
		SWAP(val[1], val[2], t);
		break;
	}
}

static int brev;
static int mnoread;

void
memex(void)
{
    int cmd, inc, i, nslash;
    unsigned n;
    unsigned char val[4];

    last_cmd = "m\n";
    scanhex(&adrs);
    while ((cmd = skipbl()) != '\n') {
	switch( cmd ){
	case 'b':	size = 1;	break;
	case 'w':	size = 2;	break;
	case 'l':	size = 4;	break;
	case 'r': 	brev = !brev;	break;
	case 'n':	mnoread = 1;	break;
	case '.':	mnoread = 0;	break;
	}
    }
    if( size <= 0 )
	size = 1;
    else if( size > 4 )
	size = 4;
    for(;;){
	if (!mnoread)
	    n = mread(adrs, val, size);
	printf("%.8x%c", adrs, brev? 'r': ' ');
	if (!mnoread) {
	    if (brev)
		byterev(val, size);
	    putchar(' ');
	    for (i = 0; i < n; ++i)
		printf("%.2x", val[i]);
	    for (; i < size; ++i)
		printf("%s", fault_chars[fault_type]);
	}
	putchar(' ');
	inc = size;
	nslash = 0;
	for(;;){
	    if( scanhex(&n) ){
		for (i = 0; i < size; ++i)
		    val[i] = n >> (i * 8);
		if (!brev)
		    byterev(val, size);
		mwrite(adrs, val, size);
		inc = size;
	    }
	    cmd = skipbl();
	    if (cmd == '\n')
		break;
	    inc = 0;
	    switch (cmd) {
	    case '\'':
		for(;;){
		    n = inchar();
		    if( n == '\\' )
			n = bsesc();
		    else if( n == '\'' )
			break;
		    for (i = 0; i < size; ++i)
			val[i] = n >> (i * 8);
		    if (!brev)
			byterev(val, size);
		    mwrite(adrs, val, size);
		    adrs += size;
		}
		adrs -= size;
		inc = size;
		break;
	    case ',':
		adrs += size;
		break;
	    case '.':
		mnoread = 0;
		break;
	    case ';':
		break;
	    case 'x':
	    case EOF:
		scannl();
		return;
	    case 'b':
	    case 'v':
		size = 1;
		break;
	    case 'w':
		size = 2;
		break;
	    case 'l':
		size = 4;
		break;
	    case '^':
		adrs -= size;
		break;
		break;
	    case '/':
		if (nslash > 0)
		    adrs -= 1 << nslash;
		else
		    nslash = 0;
		nslash += 4;
		adrs += 1 << nslash;
		break;
	    case '\\':
		if (nslash < 0)
		    adrs += 1 << -nslash;
		else
		    nslash = 0;
		nslash -= 4;
		adrs -= 1 << -nslash;
		break;
	    case 'm':
		scanhex(&adrs);
		break;
	    case 'n':
		mnoread = 1;
		break;
	    case 'r':
		brev = !brev;
		break;
	    case '<':
		n = size;
		scanhex(&n);
		adrs -= n;
		break;
	    case '>':
		n = size;
		scanhex(&n);
		adrs += n;
		break;
	    }
	}
	adrs += inc;
    }
}

int
bsesc(void)
{
	int c;

	c = inchar();
	switch( c ){
	case 'n':	c = '\n';	break;
	case 'r':	c = '\r';	break;
	case 'b':	c = '\b';	break;
	case 't':	c = '\t';	break;
	}
	return c;
}

void
dump(void)
{
	int c;

	c = inchar();
	if ((isxdigit(c) && c != 'f' && c != 'd') || c == '\n')
		termch = c;
	scanhex(&adrs);
	if( termch != '\n')
		termch = 0;
	if( c == 'i' ){
		scanhex(&nidump);
		if( nidump == 0 )
			nidump = 16;
		adrs += ppc_inst_dump(adrs, nidump);
		last_cmd = "di\n";
	} else {
		scanhex(&ndump);
		if( ndump == 0 )
			ndump = 64;
		prdump(adrs, ndump);
		adrs += ndump;
		last_cmd = "d\n";
	}
}

void
prdump(unsigned adrs, int ndump)
{
	register int n, m, c, r, nr;
	unsigned char temp[16];

	for( n = ndump; n > 0; ){
		printf("%.8x", adrs);
		putchar(' ');
		r = n < 16? n: 16;
		nr = mread(adrs, temp, r);
		adrs += nr;
		for( m = 0; m < r; ++m ){
			putchar((m & 3) == 0 && m > 0? '.': ' ');
			if( m < nr )
				printf("%.2x", temp[m]);
			else
				printf("%s", fault_chars[fault_type]);
		}
		for(; m < 16; ++m )
			printf("   ");
		printf("  |");
		for( m = 0; m < r; ++m ){
			if( m < nr ){
				c = temp[m];
				putchar(' ' <= c && c <= '~'? c: '.');
			} else
				putchar(' ');
		}
		n -= r;
		for(; m < 16; ++m )
			putchar(' ');
		printf("|\n");
		if( nr < r )
			break;
	}
}

int
ppc_inst_dump(unsigned adr, int count)
{
	int nr, dotted;
	unsigned first_adr;
	unsigned long inst, last_inst = 0;
	unsigned char val[4];

	dotted = 0;
	for (first_adr = adr; count > 0; --count, adr += 4){
		nr = mread(adr, val, 4);
		if( nr == 0 ){
			const char *x = fault_chars[fault_type];
			printf("%.8x  %s%s%s%s\n", adr, x, x, x, x);
			break;
		}
		inst = GETWORD(val);
		if (adr > first_adr && inst == last_inst) {
			if (!dotted) {
				printf(" ...\n");
				dotted = 1;
			}
			continue;
		}
		dotted = 0;
		last_inst = inst;
		printf("%.8x  ", adr);
		printf("%.8x\t", inst);
		print_insn_big_powerpc(stdout, inst, adr);	/* always returns 4 */
		printf("\n");
	}
	return adr - first_adr;
}

void
print_address(unsigned addr)
{
	printf("0x%x", addr);
}

/*
 * Memory operations - move, set, print differences
 */
static unsigned mdest;		/* destination address */
static unsigned msrc;		/* source address */
static unsigned mval;		/* byte value to set memory to */
static unsigned mcount;		/* # bytes to affect */
static unsigned mdiffs;		/* max # differences to print */

void
memops(int cmd)
{
	scanhex(&mdest);
	if( termch != '\n' )
		termch = 0;
	scanhex(cmd == 's'? &mval: &msrc);
	if( termch != '\n' )
		termch = 0;
	scanhex(&mcount);
	switch( cmd ){
	case 'm':
		memmove((void *)mdest, (void *)msrc, mcount);
		break;
	case 's':
		memset((void *)mdest, mval, mcount);
		break;
	case 'd':
		if( termch != '\n' )
			termch = 0;
		scanhex(&mdiffs);
		memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs);
		break;
	}
}

void
memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr)
{
	unsigned n, prt;

	prt = 0;
	for( n = nb; n > 0; --n )
		if( *p1++ != *p2++ )
			if( ++prt <= maxpr )
				printf("%.8x %.2x # %.8x %.2x\n", (unsigned)p1 - 1,
					p1[-1], (unsigned)p2 - 1, p2[-1]);
	if( prt > maxpr )
		printf("Total of %d differences\n", prt);
}

static unsigned mend;
static unsigned mask;

void
memlocate(void)
{
	unsigned a, n;
	unsigned char val[4];

	last_cmd = "ml";
	scanhex(&mdest);
	if (termch != '\n') {
		termch = 0;
		scanhex(&mend);
		if (termch != '\n') {
			termch = 0;
			scanhex(&mval);
			mask = ~0;
			if (termch != '\n') termch = 0;
			scanhex(&mask);
		}
	}
	n = 0;
	for (a = mdest; a < mend; a += 4) {
		if (mread(a, val, 4) == 4
			&& ((GETWORD(val) ^ mval) & mask) == 0) {
			printf("%.8x:  %.8x\n", a, GETWORD(val));
			if (++n >= 10)
				break;
		}
	}
}

static unsigned mskip = 0x1000;
static unsigned mlim = 0xffffffff;

void
memzcan(void)
{
	unsigned char v;
	unsigned a;
	int ok, ook;

	scanhex(&mdest);
	if (termch != '\n') termch = 0;
	scanhex(&mskip);
	if (termch != '\n') termch = 0;
	scanhex(&mlim);
	ook = 0;
	for (a = mdest; a < mlim; a += mskip) {
		ok = mread(a, &v, 1);
		if (ok && !ook) {
			printf("%.8x .. ", a);
			fflush(stdout);
		} else if (!ok && ook)
			printf("%.8x\n", a - mskip);
		ook = ok;
		if (a + mskip < a)
			break;
	}
	if (ook)
		printf("%.8x\n", a - mskip);
}

void proccall(void)
{
	unsigned int args[8];
	unsigned int ret;
	int i;
	typedef unsigned int (*callfunc_t)(unsigned int, unsigned int,
			unsigned int, unsigned int, unsigned int,
			unsigned int, unsigned int, unsigned int);
	callfunc_t func;

	scanhex(&adrs);
	if (termch != '\n')
		termch = 0;
	for (i = 0; i < 8; ++i)
		args[i] = 0;
	for (i = 0; i < 8; ++i) {
		if (!scanhex(&args[i]) || termch == '\n')
			break;
		termch = 0;
	}
	func = (callfunc_t) adrs;
	ret = 0;
	if (setjmp(bus_error_jmp) == 0) {
		debugger_fault_handler = handle_fault;
		sync();
		ret = func(args[0], args[1], args[2], args[3],
			   args[4], args[5], args[6], args[7]);
		sync();
		printf("return value is %x\n", ret);
	} else {
		printf("*** %x exception occurred\n", fault_except);
	}
	debugger_fault_handler = NULL;
}

/* Input scanning routines */
int
skipbl(void)
{
	int c;

	if( termch != 0 ){
		c = termch;
		termch = 0;
	} else
		c = inchar();
	while( c == ' ' || c == '\t' )
		c = inchar();
	return c;
}

#define N_PTREGS	44
static char *regnames[N_PTREGS] = {
	"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
	"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
	"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
	"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
	"pc", "msr", "or3", "ctr", "lr", "xer", "ccr", "mq",
	"trap", "dar", "dsisr", "res"
};

int
scanhex(unsigned *vp)
{
	int c, d;
	unsigned v;

	c = skipbl();
	if (c == '%') {
		/* parse register name */
		char regname[8];
		int i;

		for (i = 0; i < sizeof(regname) - 1; ++i) {
			c = inchar();
			if (!isalnum(c)) {
				termch = c;
				break;
			}
			regname[i] = c;
		}
		regname[i] = 0;
		for (i = 0; i < N_PTREGS; ++i) {
			if (strcmp(regnames[i], regname) == 0) {
				unsigned *rp = (unsigned *)
					xmon_regs[smp_processor_id()];
				if (rp == NULL) {
					printf("regs not available\n");
					return 0;
				}
				*vp = rp[i];
				return 1;
			}
		}
		printf("invalid register name '%%%s'\n", regname);
		return 0;
	} else if (c == '$') {
		static char symname[128];
		int i;
		for (i=0; i<63; i++) {
			c = inchar();
			if (isspace(c)) {
				termch = c;
				break;
			}
			symname[i] = c;
		}
		symname[i++] = 0;
		*vp = 0;
		if (setjmp(bus_error_jmp) == 0) {
			debugger_fault_handler = handle_fault;
			sync();
			*vp = kallsyms_lookup_name(symname);
			sync();
		}
		debugger_fault_handler = NULL;
		if (!(*vp)) {
			printf("unknown symbol\n");
			return 0;
		}
		return 1;
	}

	d = hexdigit(c);
	if( d == EOF ){
		termch = c;
		return 0;
	}
	v = 0;
	do {
		v = (v << 4) + d;
		c = inchar();
		d = hexdigit(c);
	} while( d != EOF );
	termch = c;
	*vp = v;
	return 1;
}

void
scannl(void)
{
	int c;

	c = termch;
	termch = 0;
	while( c != '\n' )
		c = inchar();
}

int hexdigit(int c)
{
	if( '0' <= c && c <= '9' )
		return c - '0';
	if( 'A' <= c && c <= 'F' )
		return c - ('A' - 10);
	if( 'a' <= c && c <= 'f' )
		return c - ('a' - 10);
	return EOF;
}

void
getstring(char *s, int size)
{
	int c;

	c = skipbl();
	do {
		if( size > 1 ){
			*s++ = c;
			--size;
		}
		c = inchar();
	} while( c != ' ' && c != '\t' && c != '\n' );
	termch = c;
	*s = 0;
}

static char line[256];
static char *lineptr;

void
flush_input(void)
{
	lineptr = NULL;
}

int
inchar(void)
{
	if (lineptr == NULL || *lineptr == 0) {
		if (fgets(line, sizeof(line), stdin) == NULL) {
			lineptr = NULL;
			return EOF;
		}
		lineptr = line;
	}
	return *lineptr++;
}

void
take_input(char *str)
{
	lineptr = str;
}

static void
symbol_lookup(void)
{
	int type = inchar();
	unsigned addr;
	static char tmp[128];

	switch (type) {
	case 'a':
		if (scanhex(&addr))
			xmon_print_symbol(addr, ": ", "\n");
		termch = 0;
		break;
	case 's':
		getstring(tmp, 64);
		if (setjmp(bus_error_jmp) == 0) {
			debugger_fault_handler = handle_fault;
			sync();
			addr = kallsyms_lookup_name(tmp);
			if (addr)
				printf("%s: %lx\n", tmp, addr);
			else
				printf("Symbol '%s' not found.\n", tmp);
			sync();
		}
		debugger_fault_handler = NULL;
		termch = 0;
		break;
	}
}