xmon.c

linux-2.4.29操作系统的源码

		case 'b':
			bpt_cmds();
			break;
		case 'C':
			csum();
			break;
#ifdef CONFIG_SMP
		case 'c':
			cpu_cmd();
			break;
#endif /* CONFIG_SMP */
		case 'z':
			bootcmds();
		case 'T':
			debug_trace();
			break;
		default:
			printf("Unrecognized command: ");
		        do {
				if( ' ' < cmd && cmd <= '~' )
					putchar(cmd);
				else
					printf("\\x%x", cmd);
				cmd = inchar();
		        } while (cmd != '\n'); 
			printf(" (type ? for help)\n");
			break;
		}
	}
}

static void bootcmds(void)
{
	int cmd;

	cmd = inchar();
	if (cmd == 'r')
		ppc_md.restart(NULL);
	else if (cmd == 'h')
		ppc_md.halt();
	else if (cmd == 'p')
		ppc_md.power_off();
}

#ifdef CONFIG_SMP
static void cpu_cmd(void)
{
	unsigned long cpu;
	int timeout;
	int cmd;

	cmd = inchar();
	if (cmd == 'i') {
		printf("stopping all cpus\n");
		/* interrupt other cpu(s) */
		cpu = MSG_ALL_BUT_SELF;
		smp_send_xmon_break(cpu);
		return;
	}
	termch = cmd;
	if (!scanhex(&cpu)) {
		/* print cpus waiting or in xmon */
		printf("cpus stopped:");
		for (cpu = 0; cpu < NR_CPUS; ++cpu) {
			if (test_bit(cpu, &cpus_in_xmon)) {
				printf(" %x", cpu);
				if (cpu == smp_processor_id())
					printf("*", cpu);
			}
		}
		printf("\n");
		return;
	}
	/* try to switch to cpu specified */
	take_xmon = cpu;
	timeout = 10000000;
	while (take_xmon >= 0) {
		if (--timeout == 0) {
			/* yes there's a race here */
			take_xmon = -1;
			printf("cpu %u didn't take control\n", cpu);
			return;
		}
	}
	/* now have to wait to be given control back */
	while (test_and_set_bit(0, &got_xmon)) {
		if (take_xmon == smp_processor_id()) {
			take_xmon = -1;
			break;
		}
	}
}
#endif /* CONFIG_SMP */

static unsigned short fcstab[256] = {
	0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
	0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
	0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
	0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
	0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
	0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
	0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
	0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
	0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
	0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
	0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
	0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
	0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
	0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
	0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
	0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
	0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
	0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
	0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
	0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
	0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
	0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
	0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
	0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
	0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
	0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
	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 char *breakpoint_help_string = 
    "Breakpoint command usage:\n"
    "b                show breakpoints\n"
    "b <addr> [cnt]   set breakpoint at given instr addr\n"
    "bc               clear all breakpoints\n"
    "bc <n/addr>      clear breakpoint number n or at addr\n"
    "bi <addr> [cnt]  set hardware instr breakpoint (broken?)\n"
    "bd <addr> [cnt]  set hardware data breakpoint (broken?)\n"
    "";

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

	cmd = inchar();
	switch (cmd) {
	case 'd':	/* bd - hardware data breakpoint */
		if (cur_cpu_spec->cpu_features & CPU_FTR_SLB) {
			printf("Not implemented on POWER4\n");
			break;
		}
			
		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':	/* bi - hardware instr breakpoint */
		if (cur_cpu_spec->cpu_features & CPU_FTR_SLB) {
			printf("Not implemented on POWER4\n");
			break;
		}
		iabr.address = 0;
		iabr.count = 0;
		iabr.enabled = scanhex(&iabr.address);
		if (iabr.enabled)
			iabr.address |= 3;
		scanhex(&iabr.count);
		break;
	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 {
			if (a <= NBPTS && a >= 1) {
				/* assume a breakpoint number */
				--a;	/* bp nums are 1 based */
				bp = &bpts[a];
			} else {
				/* assume a breakpoint address */
				bp = at_breakpoint(a);
			}
			if (bp == 0) {
				printf("No breakpoint at %x\n", a);
			} else {
				printf("Cleared breakpoint %x (%lx %s)\n", (bp - bpts)+1, bp->address, bp->funcname);
				bp->enabled = 0;
			}
		}
		break;
	case '?':
	        printf(breakpoint_help_string);
	        break;
	default:
		termch = cmd;
	        cmd = skipbl();
		if (cmd == '?') {
			printf(breakpoint_help_string);
			break;
		}
		termch = cmd;
		if (!scanhex(&a)) {
			/* print all breakpoints */
			int bpnum;

			printf("   type            address    count\n");
			if (dabr.enabled) {
				printf("   data   %.16lx %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   %.16lx %8x\n", iabr.address & ~3,
				       iabr.count);
			for (bp = bpts, bpnum = 1; bp < &bpts[NBPTS]; ++bp, ++bpnum)
				if (bp->enabled)
					printf("%2x trap   %.16lx %8x  %s\n", bpnum, bp->address, bp->count, bp->funcname);
			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.  Please clear one first.\n");
				break;
			}
		}
		bp->enabled = 1;
		bp->address = a;
		bp->count = 0;
		scanhex(&bp->count);
		/* Find the function name just once. */
		bp->funcname[0] = '\0';
		if (find_tb_table(bp->address, &tab) && tab.name[0]) {
			/* Got a nice name for it. */
			int delta = bp->address - tab.funcstart;
			sprintf(bp->funcname, "%s+0x%x", tab.name, delta);
		}
		printf("Set breakpoint %2x trap   %.16lx %8x  %s\n", (bp-bpts)+1, bp->address, bp->count, bp->funcname);
		break;
	}
}

/* Very cheap human name for vector lookup. */
static
const char *getvecname(unsigned long vec)
{
	char *ret;
	switch (vec) {
	case 0x100:	ret = "(System Reset)"; break; 
	case 0x200:	ret = "(Machine Check)"; break; 
	case 0x300:	ret = "(Data Access)"; break; 
	case 0x380:	ret = "(Data SLB Access)"; break;
	case 0x400:	ret = "(Instruction Access)"; break; 
	case 0x480:	ret = "(Instruction SLB Access)"; break;
	case 0x500:	ret = "(Hardware Interrupt)"; break; 
	case 0x600:	ret = "(Alignment)"; break; 
	case 0x700:	ret = "(Program Check)"; break; 
	case 0x800:	ret = "(FPU Unavailable)"; break; 
	case 0x900:	ret = "(Decrementer)"; break; 
	case 0xc00:	ret = "(System Call)"; break; 
	case 0xd00:	ret = "(Single Step)"; break; 
	case 0xf00:	ret = "(Performance Monitor)"; break; 
	default: ret = "";
	}
	return ret;
}

static void
backtrace(struct pt_regs *excp)
{
	unsigned long sp;
	unsigned long lr;
	unsigned long stack[3];
	struct pt_regs regs;
	struct tbtable tab;
	int framecount;
	char *funcname;
	/* declare these as raw ptrs so we don't get func descriptors */
	extern void *ret_from_except, *ret_from_syscall_1;

	if (excp != NULL) {
	        lr = excp->link;
		sp = excp->gpr[1];
	} else {
	        /* Use care not to call any function before this point
		 so the saved lr has a chance of being good. */
	        asm volatile ("mflr %0" : "=r" (lr) :);
		sp = getsp();
	}
	scanhex(&sp);
	scannl();
	for (framecount = 0;
	     sp != 0 && framecount < MAXFRAMECOUNT;
	     sp = stack[0], framecount++) {
		if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
			break;
#if 0
		if (lr != 0) {
		    stack[2] = lr;	/* fake out the first saved lr.  It may not be saved yet. */
		    lr = 0;
		}
#endif
		printf("%.16lx  %.16lx", sp, stack[2]);
		/* TAI -- for now only the ones cast to unsigned long will match.
		 * Need to test the rest...
		 */
		if ((stack[2] == (unsigned long)ret_from_except &&
		            (funcname = "ret_from_except"))
		    || (stack[2] == (unsigned long)ret_from_syscall_1 &&
		            (funcname = "ret_from_syscall_1"))
#if 0
		    || stack[2] == (unsigned) &ret_from_syscall_2
		    || stack[2] == (unsigned) &do_signal_ret
#endif
		    ) {
			printf("  %s\n", funcname);
			if (mread(sp+112, &regs, sizeof(regs)) != sizeof(regs))
				break;
			printf("exception: %lx %s regs %lx\n", regs.trap, getvecname(regs.trap), sp+112);
			printf("                  %.16lx", regs.nip);
			if ((regs.nip & 0xffffffff00000000UL) &&
			    find_tb_table(regs.nip, &tab)) {
				int delta = regs.nip-tab.funcstart;
				if (delta < 0)
					printf("  <unknown code>");
				else
					printf("  %s+0x%x", tab.name, delta);
			}
			printf("\n");
                        if (regs.gpr[1] < sp) {
                            printf("<Stack drops into 32-bit userspace %.16lx>\n", regs.gpr[1]);
                            break;
			}

			sp = regs.gpr[1];
			if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
				break;
		} else {
			if (stack[2] && find_tb_table(stack[2], &tab)) {
				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 == 0x380 || 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);