xmon.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 2,009 行 · 第 1/3 页

	0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
	0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
	0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
	0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
	0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
	0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

#define FCS(fcs, c)	(((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff])

static void
csum(void)
{
	unsigned int i;
	unsigned short fcs;
	unsigned char v;

	if (!scanhex(&adrs))
		return;
	if (!scanhex(&ncsum))
		return;
	fcs = 0xffff;
	for (i = 0; i < ncsum; ++i) {
		if (mread(adrs+i, &v, 1) == 0) {
			printf("csum stopped at %x\n", adrs+i);
			break;
		}
		fcs = FCS(fcs, v);
	}
	printf("%x\n", fcs);
}

static void
bpt_cmds(void)
{
	int cmd;
	unsigned a;
	int mode, i;
	struct bpt *bp;

	cmd = inchar();
	switch (cmd) {
#if !defined(CONFIG_8xx)
	case 'd':
		mode = 7;
		cmd = inchar();
		if (cmd == 'r')
			mode = 5;
		else if (cmd == 'w')
			mode = 6;
		else
			termch = cmd;
		cmd = inchar();
		if (cmd == 'p')
			mode &= ~4;
		else
			termch = cmd;
		dabr.address = 0;
		dabr.count = 0;
		dabr.enabled = scanhex(&dabr.address);
		scanhex(&dabr.count);
		if (dabr.enabled)
			dabr.address = (dabr.address & ~7) | mode;
		break;
	case 'i':
		cmd = inchar();
		if (cmd == 'p')
			mode = 2;
		else
			mode = 3;
		iabr.address = 0;
		iabr.count = 0;
		iabr.enabled = scanhex(&iabr.address);
		if (iabr.enabled)
			iabr.address |= mode;
		scanhex(&iabr.count);
		break;
#endif
	case 'c':
		if (!scanhex(&a)) {
			/* clear all breakpoints */
			for (i = 0; i < NBPTS; ++i)
				bpts[i].enabled = 0;
			iabr.enabled = 0;
			dabr.enabled = 0;
			printf("All breakpoints cleared\n");
		} else {
			bp = at_breakpoint(a);
			if (bp == 0) {
				printf("No breakpoint at %x\n", a);
			} else {
				bp->enabled = 0;
			}
		}
		break;
	default:
		termch = cmd;
		if (!scanhex(&a)) {
			/* print all breakpoints */
			printf("type  address   count\n");
			if (dabr.enabled) {
				printf("data %.8x %8x [", dabr.address & ~7,
				       dabr.count);
				if (dabr.address & 1)
					printf("r");
				if (dabr.address & 2)
					printf("w");
				if (!(dabr.address & 4))
					printf("p");
				printf("]\n");
			}
			if (iabr.enabled)
				printf("inst %.8x %8x\n", iabr.address & ~3,
				       iabr.count);
			for (bp = bpts; bp < &bpts[NBPTS]; ++bp)
				if (bp->enabled)
					printf("trap %.8x %8x\n", bp->address,
					       bp->count);
			break;
		}
		bp = at_breakpoint(a);
		if (bp == 0) {
			for (bp = bpts; bp < &bpts[NBPTS]; ++bp)
				if (!bp->enabled)
					break;
			if (bp >= &bpts[NBPTS]) {
				printf("Sorry, no free breakpoints\n");
				break;
			}
		}
		bp->enabled = 1;
		bp->address = a;
		bp->count = 0;
		scanhex(&bp->count);
		break;
	}
}

static void
backtrace(struct pt_regs *excp)
{
	unsigned sp;
	unsigned stack[2];
	struct pt_regs regs;
	extern char ret_from_except, ret_from_except_full, ret_from_syscall;

	printf("backtrace:\n");
	
	if (excp != NULL)
		sp = excp->gpr[1];
	else
		sp = getsp();
	scanhex(&sp);
	scannl();
	for (; sp != 0; sp = stack[0]) {
		if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
			break;
		pretty_print_addr(stack[1]);
		printf(" ");
		if (stack[1] == (unsigned) &ret_from_except
		    || stack[1] == (unsigned) &ret_from_except_full
		    || stack[1] == (unsigned) &ret_from_syscall) {
			if (mread(sp+16, &regs, sizeof(regs)) != sizeof(regs))
				break;
			printf("\nexception:%x [%x] %x ", regs.trap, sp+16,
			       regs.nip);
			sp = regs.gpr[1];
			if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
				break;
		}
		printf("\n");
	}
}

int
getsp(void)
{
    int x;

    asm("mr %0,1" : "=r" (x) :);
    return x;
}

void
excprint(struct pt_regs *fp)
{
	int trap;

#ifdef CONFIG_SMP
	printf("cpu %d: ", smp_processor_id());
#endif /* CONFIG_SMP */
	printf("vector: %x at pc = ", fp->trap);
	pretty_print_addr(fp->nip);
	printf(", lr = ");
	pretty_print_addr(fp->link);
	printf("\nmsr = %x, sp = %x [%x]\n", fp->msr, fp->gpr[1], fp);
	trap = TRAP(fp);
	if (trap == 0x300 || trap == 0x600)
		printf("dar = %x, dsisr = %x\n", fp->dar, fp->dsisr);
	if (current)
		printf("current = %x, pid = %d, comm = %s\n",
		       current, current->pid, current->comm);
}

void
prregs(struct pt_regs *fp)
{
	int n;
	unsigned base;

	if (scanhex(&base))
		fp = (struct pt_regs *) base;
	for (n = 0; n < 32; ++n) {
		printf("R%.2d = %.8x%s", n, fp->gpr[n],
		       (n & 3) == 3? "\n": "   ");
		if (n == 12 && !FULL_REGS(fp)) {
			printf("\n");
			break;
		}
	}
	printf("pc  = %.8x   msr = %.8x   lr  = %.8x   cr  = %.8x\n",
	       fp->nip, fp->msr, fp->link, fp->ccr);
	printf("ctr = %.8x   xer = %.8x   trap = %4x\n",
	       fp->ctr, fp->xer, fp->trap);
}

void
cacheflush(void)
{
	int cmd;
	unsigned nflush;

	cmd = inchar();
	if (cmd != 'i')
		termch = cmd;
	scanhex(&adrs);
	if (termch != '\n')
		termch = 0;
	nflush = 1;
	scanhex(&nflush);
	nflush = (nflush + 31) / 32;
	if (cmd != 'i') {
		for (; nflush > 0; --nflush, adrs += 0x20)
			cflush((void *) adrs);
	} else {
		for (; nflush > 0; --nflush, adrs += 0x20)
			cinval((void *) adrs);
	}
}

unsigned int
read_spr(int n)
{
    unsigned int instrs[2];
    int (*code)(void);

    instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
    instrs[1] = 0x4e800020;
    store_inst(instrs);
    store_inst(instrs+1);
    code = (int (*)(void)) instrs;
    return code();
}

void
write_spr(int n, unsigned int val)
{
    unsigned int instrs[2];
    int (*code)(unsigned int);

    instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
    instrs[1] = 0x4e800020;
    store_inst(instrs);
    store_inst(instrs+1);
    code = (int (*)(unsigned int)) instrs;
    code(val);
}

static unsigned int regno;
extern char exc_prolog;
extern char dec_exc;

void
print_sysmap(void)
{
	extern char *sysmap;
	if ( sysmap ) {
		printf("System.map: \n");
		if( setjmp(bus_error_jmp) == 0 ) {
			debugger_fault_handler = handle_fault;
			sync();
			xmon_puts(sysmap);
			sync();
		}
		debugger_fault_handler = NULL;
	}
	else
		printf("No System.map\n");
}

void
super_regs(void)
{
	int i, cmd;
	unsigned val;

	cmd = skipbl();
	if (cmd == '\n') {
		printf("msr = %x, pvr = %x\n", get_msr(), get_pvr());
		printf("sprg0-3 = %x %x %x %x\n", get_sprg0(), get_sprg1(),
		       get_sprg2(), get_sprg3());
		printf("srr0 = %x, srr1 = %x\n", get_srr0(), get_srr1());
#ifdef CONFIG_PPC_STD_MMU
		printf("sr0-15 =");
		for (i = 0; i < 16; ++i)
			printf(" %x", get_sr(i));
		printf("\n");
#endif
		asm("mr %0,1" : "=r" (i) :);
		printf("sp = %x ", i);
		asm("mr %0,2" : "=r" (i) :);
		printf("toc = %x\n", i);
		return;
	}

	scanhex(&regno);
	switch (cmd) {
	case 'w':
		val = read_spr(regno);
		scanhex(&val);
		write_spr(regno, val);
		/* fall through */
	case 'r':
		printf("spr %x = %x\n", regno, read_spr(regno));
		break;
	case 's':
		val = get_sr(regno);
		scanhex(&val);
		set_sr(regno, val);
		break;
	case 'm':
		val = get_msr();
		scanhex(&val);
		set_msr(val);
		break;
	}
	scannl();
}

#ifndef CONFIG_PPC_STD_MMU
static void
dump_hash_table(void)
{
	printf("This CPU doesn't have a hash table.\n");
}
#else

#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 hash_ctx;
static unsigned hash_start;
static unsigned hash_end;

static void
dump_hash_table(void)
{
	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 * 0x111),
				    seg_start, seg_end);
		seg_start = seg_end + 0x1000;
	}
}
#endif /* CONFIG_PPC_STD_MMU */

/*
 * Stuff for reading and writing memory safely
 */

int
mread(unsigned 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 = NULL;
	return n;
}

int
mwrite(unsigned 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();
		n = size;
	} else {
		printf("*** Error writing address %x\n", adrs + n);
	}
	debugger_fault_handler = NULL;
	return n;
}

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

static void
handle_fault(struct pt_regs *regs)
{
	fault_except = TRAP(regs);
	fault_type = TRAP(regs) == 0x200? 0: TRAP(regs) == 0x300? 1: 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;
	}
}

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;