xmon.c

microwindows移植到S3C44B0的源码

				int delta = stack[2]-tab.funcstart;
				if (delta < 0)
					printf("  <unknown code>");
				else
					printf("  %s+0x%x", tab.name, delta);
			}
			printf("\n");
		}
		if (stack[0] && stack[0] <= sp) {
			if ((stack[0] & 0xffffffff00000000UL) == 0)
				printf("<Stack drops into 32-bit userspace %.16lx>\n", stack[0]);
			else
				printf("<Corrupt stack.  Next backchain is %.16lx>\n", stack[0]);
			break;
		}
	}
	if (framecount >= MAXFRAMECOUNT)
		printf("<Punt. Too many stack frames>\n");
}

int
getsp()
{
	int x;

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

spinlock_t exception_print_lock = SPIN_LOCK_UNLOCKED;

void
excprint(struct pt_regs *fp)
{
	struct task_struct *c;
	struct tbtable tab;
	unsigned long flags;

	spin_lock_irqsave(&exception_print_lock, flags);

#ifdef CONFIG_SMP
	printf("cpu %d: ", smp_processor_id());
#endif /* CONFIG_SMP */

	printf("Vector: %lx %s at  [%lx]\n", fp->trap, getvecname(fp->trap), fp);
	printf("    pc: %lx", fp->nip);
	if (find_tb_table(fp->nip, &tab) && tab.name[0]) {
		/* Got a nice name for it */
		int delta = fp->nip - tab.funcstart;
		printf(" (%s+0x%x)", tab.name, delta);
	}
	printf("\n");
	printf("    lr: %lx", fp->link);
	if (find_tb_table(fp->link, &tab) && tab.name[0]) {
		/* Got a nice name for it */
		int delta = fp->link - tab.funcstart;
		printf(" (%s+0x%x)", tab.name, delta);
	}
	printf("\n");
	printf("    sp: %lx\n", fp->gpr[1]);
	printf("   msr: %lx\n", fp->msr);

	if (fp->trap == 0x300 || fp->trap == 0x600) {
		printf("   dar: %lx\n", fp->dar);
		printf(" dsisr: %lx\n", fp->dsisr);
	}

	/* XXX: need to copy current or we die.  Why? */
	c = current;
	printf("  current = 0x%lx\n", c);
	printf("  paca    = 0x%lx\n", get_paca());
	if (c) {
		printf("  current = %lx, pid = %ld, comm = %s\n",
		       c, c->pid, c->comm);
	}

	spin_unlock_irqrestore(&exception_print_lock, flags);
}

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

	if (scanhex((void *)&base))
		fp = (struct pt_regs *) base;
	for (n = 0; n < 16; ++n)
		printf("R%.2ld = %.16lx   R%.2ld = %.16lx\n", n, fp->gpr[n],
		       n+16, fp->gpr[n+16]);
	printf("pc  = %.16lx   msr = %.16lx\nlr  = %.16lx   cr  = %.16lx\n",
	       fp->nip, fp->msr, fp->link, fp->ccr);
	printf("ctr = %.16lx   xer = %.16lx   trap = %8lx\n",
	       fp->ctr, fp->xer, fp->trap);
}

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

	cmd = inchar();
	if (cmd != 'i')
		termch = cmd;
	scanhex((void *)&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 long
read_spr(int n)
{
	unsigned int instrs[2];
	unsigned long (*code)(void);
	unsigned long opd[3];

	instrs[0] = 0x7c6002a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
	instrs[1] = 0x4e800020;
	opd[0] = (unsigned long)instrs;
	opd[1] = 0;
	opd[2] = 0;
	store_inst(instrs);
	store_inst(instrs+1);
	code = (unsigned long (*)(void)) opd;

	return code();
}

void
write_spr(int n, unsigned long val)
{
	unsigned int instrs[2];
	unsigned long (*code)(unsigned long);
	unsigned long opd[3];

	instrs[0] = 0x7c6003a6 + ((n & 0x1F) << 16) + ((n & 0x3e0) << 6);
	instrs[1] = 0x4e800020;
	opd[0] = (unsigned long)instrs;
	opd[1] = 0;
	opd[2] = 0;
	store_inst(instrs);
	store_inst(instrs+1);
	code = (unsigned long (*)(unsigned long)) opd;

	code(val);
}

static unsigned long 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 long val;
	struct paca_struct*  ptrPaca = NULL;
	struct ItLpPaca*  ptrLpPaca = NULL;
	struct ItLpRegSave*  ptrLpRegSave = NULL;

	cmd = skipbl();
	if (cmd == '\n') {
	        unsigned long sp, toc;
		asm("mr %0,1" : "=r" (sp) :);
		asm("mr %0,2" : "=r" (toc) :);

		printf("msr  = %.16lx  sprg0= %.16lx\n", get_msr(), get_sprg0());
		printf("pvr  = %.16lx  sprg1= %.16lx\n", get_pvr(), get_sprg1()); 
		printf("dec  = %.16lx  sprg2= %.16lx\n", get_dec(), get_sprg2());
		printf("sp   = %.16lx  sprg3= %.16lx\n", sp, get_sprg3());
		printf("toc  = %.16lx  dar  = %.16lx\n", toc, get_dar());
		printf("srr0 = %.16lx  srr1 = %.16lx\n", get_srr0(), get_srr1());
		printf("asr  = %.16lx\n", mfasr());
		for (i = 0; i < 8; ++i)
			printf("sr%.2ld = %.16lx  sr%.2ld = %.16lx\n", i, get_sr(i), i+8, get_sr(i+8));

		// Dump out relevant Paca data areas.
		printf("Paca: \n");
		ptrPaca = get_paca();
    
		printf("  Local Processor Control Area (LpPaca): \n");
		ptrLpPaca = ptrPaca->xLpPacaPtr;
		printf("    Saved Srr0=%.16lx  Saved Srr1=%.16lx \n", ptrLpPaca->xSavedSrr0, ptrLpPaca->xSavedSrr1);
		printf("    Saved Gpr3=%.16lx  Saved Gpr4=%.16lx \n", ptrLpPaca->xSavedGpr3, ptrLpPaca->xSavedGpr4);
		printf("    Saved Gpr5=%.16lx \n", ptrLpPaca->xSavedGpr5);
    
		printf("  Local Processor Register Save Area (LpRegSave): \n");
		ptrLpRegSave = ptrPaca->xLpRegSavePtr;
		printf("    Saved Sprg0=%.16lx  Saved Sprg1=%.16lx \n", ptrLpRegSave->xSPRG0, ptrLpRegSave->xSPRG0);
		printf("    Saved Sprg2=%.16lx  Saved Sprg3=%.16lx \n", ptrLpRegSave->xSPRG2, ptrLpRegSave->xSPRG3);
		printf("    Saved Msr  =%.16lx  Saved Nia  =%.16lx \n", ptrLpRegSave->xMSR, ptrLpRegSave->xNIA);
    
		return;
	}

	scanhex(&regno);
	switch (cmd) {
	case 'w':
		val = read_spr(regno);
		scanhex(&val);
		write_spr(regno, val);
		/* fall through */
	case 'r':
		printf("spr %lx = %lx\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_msrd(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 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)
{
	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;
	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"