xmon.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

	unsigned a;
	int mode, i;
	struct bpt *bp;

	cmd = inchar();
	switch (cmd) {
#if !defined(CONFIG_8xx) && !defined(CONFIG_POWER4)
	case 'd':
		mode = 7;
		cmd = inchar();
		if (cmd == 'r')
			mode = 5;
		else if (cmd == 'w')
			mode = 6;
		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':
		iabr.address = 0;
		iabr.count = 0;
		iabr.enabled = scanhex(&iabr.address);
		if (iabr.enabled)
			iabr.address |= 3;
		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");
				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_intercept, ret_from_syscall_1, ret_from_syscall_2;
	extern char lost_irq_ret, do_bottom_half_ret, do_signal_ret;
	extern char ret_from_except;

	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;
		printf("%x ", stack[1]);
		if (stack[1] == (unsigned) &ret_from_intercept
		    || stack[1] == (unsigned) &ret_from_except
		    || stack[1] == (unsigned) &ret_from_syscall_1
		    || stack[1] == (unsigned) &ret_from_syscall_2
		    || stack[1] == (unsigned) &lost_irq_ret
		    || stack[1] == (unsigned) &do_bottom_half_ret
		    || stack[1] == (unsigned) &do_signal_ret) {
			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()
{
    int x;

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

void
excprint(struct pt_regs *fp)
{
#ifdef CONFIG_SMP
	printf("cpu %d: ", smp_processor_id());
#endif /* CONFIG_SMP */
	printf("vector: %x at pc = %x",
	       fp->trap, fp->nip);
	printf(", lr = %x, msr = %x, sp = %x [%x]\n",
	       fp->link, fp->msr, fp->gpr[1], fp);
	if (fp->trap == 0x300 || fp->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": "   ");
	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%s", sysmap);
}

void
super_regs()
{
	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());
		printf("sr0-15 =");
		for (i = 0; i < 16; ++i)
			printf(" %x", get_sr(i));
		printf("\n");
		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();
}

#if 0
static void
openforth()
{
    int c;
    char *p;
    char cmd[1024];
    int args[5];
    extern int (*prom_entry)(int *);

    p = cmd;
    c = skipbl();
    while (c != '\n') {
	*p++ = c;
	c = inchar();
    }
    *p = 0;
    args[0] = (int) "interpret";
    args[1] = 1;
    args[2] = 1;
    args[3] = (int) cmd;
    (*prom_entry)(args);
    printf("\n");
    if (args[4] != 0)
	printf("error %x\n", args[4]);
}
#endif

#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()
{
	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;
	}
}

/*
 * Stuff for reading and writing memory safely
 */
extern inline void sync(void)
{
	asm volatile("sync; isync");
}

extern inline void __delay(unsigned int loops)
{
	if (loops != 0)
		__asm__ __volatile__("mtctr %0; 1: bdnz 1b" : :
				     "r" (loops) : "ctr");
}

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 = 0;
	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 = 0;
	return n;
}

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

static void
handle_fault(struct pt_regs *regs)
{
	fault_type = regs->trap == 0x200? 0: regs->trap == 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;
	}
}