xmon.c

linux-2.4.29操作系统的源码

		scanhex(&val);
		set_sr(regno, val);
		break;
	case 'm':
		val = get_msr();
		scanhex(&val);
		set_msrd(val);
		break;
	}
	scannl();
}

#ifndef CONFIG_PPC64BRIDGE
static void
dump_hash_table_seg(unsigned seg, unsigned start, unsigned end)
{
	extern void *Hash;
	extern unsigned long Hash_size;
	unsigned *htab = Hash;
	unsigned hsize = Hash_size;
	unsigned v, hmask, va, last_va;
	int found, last_found, i;
	unsigned *hg, w1, last_w2, last_va0;

	last_found = 0;
	hmask = hsize / 64 - 1;
	va = start;
	start = (start >> 12) & 0xffff;
	end = (end >> 12) & 0xffff;
	for (v = start; v < end; ++v) {
		found = 0;
		hg = htab + (((v ^ seg) & hmask) * 16);
		w1 = 0x80000000 | (seg << 7) | (v >> 10);
		for (i = 0; i < 8; ++i, hg += 2) {
			if (*hg == w1) {
				found = 1;
				break;
			}
		}
		if (!found) {
			w1 ^= 0x40;
			hg = htab + ((~(v ^ seg) & hmask) * 16);
			for (i = 0; i < 8; ++i, hg += 2) {
				if (*hg == w1) {
					found = 1;
					break;
				}
			}
		}
		if (!(last_found && found && (hg[1] & ~0x180) == last_w2 + 4096)) {
			if (last_found) {
				if (last_va != last_va0)
					printf(" ... %x", last_va);
				printf("\n");
			}
			if (found) {
				printf("%x to %x", va, hg[1]);
				last_va0 = va;
			}
			last_found = found;
		}
		if (found) {
			last_w2 = hg[1] & ~0x180;
			last_va = va;
		}
		va += 4096;
	}
	if (last_found)
		printf(" ... %x\n", last_va);
}

#else /* CONFIG_PPC64BRIDGE */
static void
dump_hash_table_seg(unsigned seg, unsigned start, unsigned end)
{
	extern void *Hash;
	extern unsigned long Hash_size;
	unsigned *htab = Hash;
	unsigned hsize = Hash_size;
	unsigned v, hmask, va, last_va;
	int found, last_found, i;
	unsigned *hg, w1, last_w2, last_va0;

	last_found = 0;
	hmask = hsize / 128 - 1;
	va = start;
	start = (start >> 12) & 0xffff;
	end = (end >> 12) & 0xffff;
	for (v = start; v < end; ++v) {
		found = 0;
		hg = htab + (((v ^ seg) & hmask) * 32);
		w1 = 1 | (seg << 12) | ((v & 0xf800) >> 4);
		for (i = 0; i < 8; ++i, hg += 4) {
			if (hg[1] == w1) {
				found = 1;
				break;
			}
		}
		if (!found) {
			w1 ^= 2;
			hg = htab + ((~(v ^ seg) & hmask) * 32);
			for (i = 0; i < 8; ++i, hg += 4) {
				if (hg[1] == w1) {
					found = 1;
					break;
				}
			}
		}
		if (!(last_found && found && (hg[3] & ~0x180) == last_w2 + 4096)) {
			if (last_found) {
				if (last_va != last_va0)
					printf(" ... %x", last_va);
				printf("\n");
			}
			if (found) {
				printf("%x to %x", va, hg[3]);
				last_va0 = va;
			}
			last_found = found;
		}
		if (found) {
			last_w2 = hg[3] & ~0x180;
			last_va = va;
		}
		va += 4096;
	}
	if (last_found)
		printf(" ... %x\n", last_va);
}
#endif /* CONFIG_PPC64BRIDGE */

static unsigned long hash_ctx;
static unsigned long hash_start;
static unsigned long hash_end;

static void
dump_hash_table()
{
	int seg;
	unsigned seg_start, seg_end;

	hash_ctx = 0;
	hash_start = 0;
	hash_end = 0xfffff000;
	scanhex(&hash_ctx);
	scanhex(&hash_start);
	scanhex(&hash_end);
	printf("Mappings for context %x\n", hash_ctx);
	seg_start = hash_start;
	for (seg = hash_start >> 28; seg <= hash_end >> 28; ++seg) {
		seg_end = (seg << 28) | 0x0ffff000;
		if (seg_end > hash_end)
			seg_end = hash_end;
		dump_hash_table_seg((hash_ctx << 4) + seg, seg_start, seg_end);
		seg_start = seg_end + 0x1000;
	}
}

int
mread(unsigned long adrs, void *buf, int size)
{
	volatile int n;
	char *p, *q;

	n = 0;
	if( setjmp(bus_error_jmp) == 0 ){
		debugger_fault_handler = handle_fault;
		sync();
		p = (char *) adrs;
		q = (char *) buf;
		switch (size) {
		case 2: *(short *)q = *(short *)p;	break;
		case 4: *(int *)q = *(int *)p;		break;
		default:
			for( ; n < size; ++n ) {
				*q++ = *p++;
				sync();
			}
		}
		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
		n = size;
	}
	debugger_fault_handler = 0;
	return n;
}

int
mwrite(unsigned long adrs, void *buf, int size)
{
	volatile int n;
	char *p, *q;

	n = 0;
	if( setjmp(bus_error_jmp) == 0 ){
		debugger_fault_handler = handle_fault;
		sync();
		p = (char *) adrs;
		q = (char *) buf;
		switch (size) {
		case 2: *(short *)p = *(short *)q;	break;
		case 4: *(int *)p = *(int *)q;		break;
		default:
			for( ; n < size; ++n ) {
				*p++ = *q++;
				sync();
			}
		}
		sync();
		/* wait a little while to see if we get a machine check */
		__delay(200);
		n = size;
	} else {
		printf("*** Error writing address %x\n", adrs + n);
	}
	debugger_fault_handler = 0;
	return n;
}

static int fault_type;
static char *fault_chars[] = { "--", "**", "##" };

static void
handle_fault(struct pt_regs *regs)
{
	switch (regs->trap) {
	case 0x200:
		fault_type = 0;
		break;
	case 0x300:
	case 0x380:
		fault_type = 1;
		break;
	default:
		fault_type = 2;
	}

	longjmp(bus_error_jmp, 1);
}

#define SWAP(a, b, t)	((t) = (a), (a) = (b), (b) = (t))

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;
	case 8: /* is there really any use for this? */
		SWAP(val[0], val[7], t);
		SWAP(val[1], val[6], t);
		SWAP(val[2], val[5], t);
		SWAP(val[3], val[4], t);
		break;
	}
}

static int brev;
static int mnoread;

static char *memex_help_string = 
    "Memory examine command usage:\n"
    "m [addr] [flags] examine/change memory\n"
    "  addr is optional.  will start where left off.\n"
    "  flags may include chars from this set:\n"
    "    b   modify by bytes (default)\n"
    "    w   modify by words (2 byte)\n"
    "    l   modify by longs (4 byte)\n"
    "    d   modify by doubleword (8 byte)\n"
    "    r   toggle reverse byte order mode\n"
    "    n   do not read memory (for i/o spaces)\n"
    "    .   ok to read (default)\n"
    "NOTE: flags are saved as defaults\n"
    "";

static char *memex_subcmd_help_string = 
    "Memory examine subcommands:\n"
    "  hexval   write this val to current location\n"
    "  'string' write chars from string to this location\n"
    "  '        increment address\n"
    "  ^        decrement address\n"
    "  /        increment addr by 0x10.  //=0x100, ///=0x1000, etc\n"
    "  \\        decrement addr by 0x10.  \\\\=0x100, \\\\\\=0x1000, etc\n"
    "  `        clear no-read flag\n"
    "  ;        stay at this addr\n"
    "  v        change to byte mode\n"
    "  w        change to word (2 byte) mode\n"
    "  l        change to long (4 byte) mode\n"
    "  u        change to doubleword (8 byte) mode\n"
    "  m addr   change current addr\n"
    "  n        toggle no-read flag\n"
    "  r        toggle byte reverse flag\n"
    "  < count  back up count bytes\n"
    "  > count  skip forward count bytes\n"
    "  x        exit this mode\n"
    "";

void
memex()
{
	int cmd, inc, i, nslash;
	unsigned long n;
	unsigned char val[16];

	scanhex((void *)&adrs);
	cmd = skipbl();
	if (cmd == '?') {
		printf(memex_help_string);
		return;
	} else {
		termch = cmd;
	}
	last_cmd = "m\n";
	while ((cmd = skipbl()) != '\n') {
		switch( cmd ){
		case 'b':	size = 1;	break;
		case 'w':	size = 2;	break;
		case 'l':	size = 4;	break;
		case 'd':	size = 8;	break;
		case 'r': 	brev = !brev;	break;
		case 'n':	mnoread = 1;	break;
		case '.':	mnoread = 0;	break;
		}
	}
	if( size <= 0 )
		size = 1;
	else if( size > 8 )
		size = 8;
	for(;;){
		if (!mnoread)
			n = mread(adrs, val, size);
		printf("%.16x%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 'u':
				size = 8;
				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((void *)&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;
			case '?':
				printf(memex_subcmd_help_string);
				break;
			}
		}
		adrs += inc;
	}
}

int
bsesc()
{
	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;
}

#define isxdigit(c)	(('0' <= (c) && (c) <= '9') \
			 || ('a' <= (c) && (c) <= 'f') \
			 || ('A' <= (c) && (c) <= 'F'))
void
dump()
{
	int c;

	c = inchar();
	if ((isxdigit(c) && c != 'f' && c != 'd') || c == '\n')
		termch = c;
	scanhex((void *)&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 long adrs, long ndump)
{
	long n, m, c, r, nr;
	unsigned char temp[16];

	for( n = ndump; n > 0; ){
		printf("%.16lx", adrs);
		putchar(' ');
		r = n < 16? n: 16;
		nr = mread(adrs, temp, r);
		adrs += nr;
		for( m = 0; m < r; ++m ){
		        if ((m & 7) == 0 && m > 0)
			    putchar(' ');
			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 long adr, long count)
{
	int nr, dotted;
	unsigned long first_adr;
	unsigned long inst, last_inst;
	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("%.16lx  %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("%.16lx  ", 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 long addr)
{
	printf("0x%lx", addr);
}

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

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