patch-2.2.12 linux/arch/ppc/xmon/xmon.c

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diff -u --recursive --new-file v2.2.11/linux/arch/ppc/xmon/xmon.c linux/arch/ppc/xmon/xmon.c
@@ -0,0 +1,1323 @@
+/*
+ * Routines providing a simple monitor for use on the PowerMac.
+ *
+ * Copyright (C) 1996 Paul Mackerras.
+ */
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <asm/ptrace.h>
+#include <asm/string.h>
+#include "nonstdio.h"
+#include "privinst.h"
+
+#define scanhex	xmon_scanhex
+#define skipbl	xmon_skipbl
+
+static unsigned adrs;
+static int size = 1;
+static unsigned ndump = 64;
+static unsigned nidump = 16;
+static int termch;
+
+static u_int bus_error_jmp[100];
+#define setjmp xmon_setjmp
+#define longjmp xmon_longjmp
+
+/* Breakpoint stuff */
+struct bpt {
+	unsigned address;
+	unsigned instr;
+	unsigned count;
+	unsigned char enabled;
+};
+
+#define NBPTS	16
+static struct bpt bpts[NBPTS];
+static struct bpt dabr;
+static struct bpt iabr;
+static unsigned bpinstr = 0x7fe00008;	/* trap */
+
+/* Prototypes */
+extern void (*debugger_fault_handler)(struct pt_regs *);
+static int cmds(struct pt_regs *);
+static int mread(unsigned, void *, int);
+static int mwrite(unsigned, void *, int);
+static void handle_fault(struct pt_regs *);
+static void byterev(unsigned char *, int);
+static void memex(void);
+static int bsesc(void);
+static void dump(void);
+static void prdump(unsigned, int);
+#ifdef __MWERKS__
+static void prndump(unsigned, int);
+static int nvreadb(unsigned);
+#endif
+static int ppc_inst_dump(unsigned, int);
+void print_address(unsigned);
+static int getsp(void);
+static void dump_hash_table(void);
+static void backtrace(struct pt_regs *);
+static void excprint(struct pt_regs *);
+static void prregs(struct pt_regs *);
+static void memops(int);
+static void memlocate(void);
+static void memzcan(void);
+static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned);
+int skipbl(void);
+int scanhex(unsigned *valp);
+static void scannl(void);
+static int hexdigit(int);
+void getstring(char *, int);
+static void flush_input(void);
+static int inchar(void);
+static void take_input(char *);
+/* static void openforth(void); */
+static unsigned read_spr(int);
+static void write_spr(int, unsigned);
+static void super_regs(void);
+static void remove_bpts(void);
+static void insert_bpts(void);
+static struct bpt *at_breakpoint(unsigned pc);
+static void bpt_cmds(void);
+
+extern int print_insn_big_powerpc(FILE *, unsigned long, unsigned);
+extern void printf(const char *fmt, ...);
+extern int putchar(int ch);
+extern int setjmp(u_int *);
+extern void longjmp(u_int *, int);
+
+#define GETWORD(v)	(((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3])
+
+static char *help_string = "\
+Commands:\n\
+  d	dump bytes\n\
+  di	dump instructions\n\
+  df	dump float values\n\
+  dd	dump double values\n\
+  e	print exception information\n\
+  h	dump hash table\n\
+  m	examine/change memory\n\
+  mm	move a block of memory\n\
+  ms	set a block of memory\n\
+  md	compare two blocks of memory\n\
+  r	print registers\n\
+  S	print special registers\n\
+  t	print backtrace\n\
+  x	exit monitor\n\
+";
+
+static int xmon_trace;
+#define SSTEP	1		/* stepping because of 's' command */
+#define BRSTEP	2		/* stepping over breakpoint */
+
+void
+xmon(struct pt_regs *excp)
+{
+	struct pt_regs regs;
+	int msr, cmd;
+
+	printk("Entering xmon kernel debugger.\n");
+	
+	if (excp == NULL) {
+		asm volatile ("stw	0,0(%0)\n\
+			lwz	0,0(1)\n\
+			stw	0,4(%0)\n\
+			stmw	2,8(%0)" : : "b" (&regs));
+		regs.nip = regs.link = ((unsigned long *)regs.gpr[1])[1];
+		regs.msr = get_msr();
+		regs.ctr = get_ctr();
+		regs.xer = get_xer();
+		regs.ccr = get_cr();
+		regs.trap = 0;
+		excp = &regs;
+	}
+
+	msr = get_msr();
+	set_msr(msr & ~0x8000);	/* disable interrupts */
+	remove_bpts();
+	excprint(excp);
+	cmd = cmds(excp);
+	if (cmd == 's') {
+		xmon_trace = SSTEP;
+		excp->msr |= 0x400;
+	} else if (at_breakpoint(excp->nip)) {
+		xmon_trace = BRSTEP;
+		excp->msr |= 0x400;
+	} else {
+		xmon_trace = 0;
+		insert_bpts();
+	}
+	set_msr(msr);		/* restore interrupt enable */
+}
+
+void
+xmon_irq(int irq, void *d, struct pt_regs *regs)
+{
+	printf("Keyboard interrupt\n");
+	xmon(regs);
+}
+
+int
+xmon_bpt(struct pt_regs *regs)
+{
+	struct bpt *bp;
+
+	bp = at_breakpoint(regs->nip);
+	if (!bp)
+		return 0;
+	if (bp->count) {
+		--bp->count;
+		remove_bpts();
+		excprint(regs);
+		xmon_trace = BRSTEP;
+		regs->msr |= 0x400;
+	} else {
+		xmon(regs);
+	}
+	return 1;
+}
+
+int
+xmon_sstep(struct pt_regs *regs)
+{
+	if (!xmon_trace)
+		return 0;
+	if (xmon_trace == BRSTEP) {
+		xmon_trace = 0;
+		insert_bpts();
+	} else {
+		xmon(regs);
+	}
+	return 1;
+}
+
+int
+xmon_dabr_match(struct pt_regs *regs)
+{
+	if (dabr.enabled && dabr.count) {
+		--dabr.count;
+		remove_bpts();
+		excprint(regs);
+		xmon_trace = BRSTEP;
+		regs->msr |= 0x400;
+	} else {
+		dabr.instr = regs->nip;
+		xmon(regs);
+	}
+	return 1;
+}
+
+int
+xmon_iabr_match(struct pt_regs *regs)
+{
+	if (iabr.enabled && iabr.count) {
+		--iabr.count;
+		remove_bpts();
+		excprint(regs);
+		xmon_trace = BRSTEP;
+		regs->msr |= 0x400;
+	} else {
+		xmon(regs);
+	}
+	return 1;
+}
+
+static struct bpt *
+at_breakpoint(unsigned pc)
+{
+	int i;
+	struct bpt *bp;
+
+	if (dabr.enabled && pc == dabr.instr)
+		return &dabr;
+	if (iabr.enabled && pc == iabr.address)
+		return &iabr;
+	bp = bpts;
+	for (i = 0; i < NBPTS; ++i, ++bp)
+		if (bp->enabled && pc == bp->address)
+			return bp;
+	return 0;
+}
+
+static void
+insert_bpts()
+{
+	int i;
+	struct bpt *bp;
+
+	bp = bpts;
+	for (i = 0; i < NBPTS; ++i, ++bp) {
+		if (!bp->enabled)
+			continue;
+		if (mread(bp->address, &bp->instr, 4) != 4
+		    || mwrite(bp->address, &bpinstr, 4) != 4) {
+			printf("Couldn't insert breakpoint at %x, disabling\n",
+			       bp->address);
+			bp->enabled = 0;
+		}
+	}
+	if (dabr.enabled)
+		set_dabr(dabr.address);
+	if (iabr.enabled)
+		set_iabr(iabr.address);
+}
+
+static void
+remove_bpts()
+{
+	int i;
+	struct bpt *bp;
+	unsigned instr;
+
+	set_dabr(0);
+	set_iabr(0);
+	bp = bpts;
+	for (i = 0; i < NBPTS; ++i, ++bp) {
+		if (!bp->enabled)
+			continue;
+		if (mread(bp->address, &instr, 4) == 4
+		    && instr == bpinstr
+		    && mwrite(bp->address, &bp->instr, 4) != 4)
+			printf("Couldn't remove breakpoint at %x\n",
+			       bp->address);
+	}
+}
+
+static char *last_cmd;
+
+/* Command interpreting routine */
+static int
+cmds(struct pt_regs *excp)
+{
+	int cmd;
+
+	last_cmd = NULL;
+	for(;;) {
+		printf("mon> ");
+		fflush(stdout);
+		flush_input();
+		termch = 0;
+		cmd = skipbl();
+		if( cmd == '\n' ) {
+			if (last_cmd == NULL)
+				continue;
+			take_input(last_cmd);
+			last_cmd = NULL;
+			cmd = inchar();
+		}
+		switch (cmd) {
+		case 'm':
+			cmd = inchar();
+			switch (cmd) {
+			case 'm':
+			case 's':
+			case 'd':
+				memops(cmd);
+				break;
+			case 'l':
+				memlocate();
+				break;
+			case 'z':
+				memzcan();
+				break;
+			default:
+				termch = cmd;
+				memex();
+			}
+			break;
+		case 'd':
+			dump();
+			break;
+		case 'r':
+			if (excp != NULL)
+				prregs(excp);	/* print regs */
+			break;
+		case 'e':
+			if (excp == NULL)
+				printf("No exception information\n");
+			else
+				excprint(excp);
+			break;
+		case 'S':
+			super_regs();
+			break;
+		case 't':
+			backtrace(excp);
+			break;
+#if 0
+		case 'f':
+			openforth();
+			break;
+#endif
+		case 'h':
+			dump_hash_table();
+			break;
+		case 's':
+		case 'x':
+		case EOF:
+			return cmd;
+		case '?':
+			printf(help_string);
+			break;
+		default:
+			printf("Unrecognized command: ");
+			if( ' ' < cmd && cmd <= '~' )
+				putchar(cmd);
+			else
+				printf("\\x%x", cmd);
+			printf(" (type ? for help)\n");
+			break;
+		case 'b':
+			bpt_cmds();
+			break;
+		}
+	}
+}
+
+static void
+bpt_cmds(void)
+{
+	int cmd;
+	unsigned a;
+	int mode, i;
+	struct bpt *bp;
+
+	cmd = inchar();
+	switch (cmd) {
+	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;
+	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 int_return, syscall_ret_1, syscall_ret_2;
+	extern char lost_irq_ret, do_bottom_half_ret, do_signal_ret;
+
+	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) &int_return
+		    || stack[1] == (unsigned) &syscall_ret_1
+		    || stack[1] == (unsigned) &syscall_ret_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)
+{
+	printf("vector: %x at pc = %x, msr = %x, sp = %x [%x]\n",
+	       fp->trap, fp->nip, 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);
+}
+
+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
+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
+
+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);
+}
+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;
+	}
+}
+
+static int brev;
+static int mnoread;
+
+void
+memex()
+{
+    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;
+		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 '^':
+		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(&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;
+	    }
+	}
+	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(&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 adrs, int ndump)
+{
+	register int n, m, c, r, nr;
+	unsigned char temp[16];
+
+	for( n = ndump; n > 0; ){
+		printf("%.8x", adrs);
+		putchar(' ');
+		r = n < 16? n: 16;
+		nr = mread(adrs, temp, r);
+		adrs += nr;
+		for( m = 0; m < r; ++m ){
+			putchar((m & 3) == 0 && m > 0? '.': ' ');
+			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 adr, int count)
+{
+	int nr, dotted;
+	unsigned 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("%.8x  %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("%.8x  ", adr);
+		printf("%.8x\t", inst);
+		print_insn_big_powerpc(stdout, inst, adr);	/* always returns 4 */
+		printf("\n");
+	}
+	return adr - first_adr;
+}
+
+void
+print_address(addr)
+unsigned addr;
+{
+	printf("0x%x", addr);
+}
+
+/*
+ * Memory operations - move, set, print differences
+ */
+static unsigned mdest;		/* destination address */
+static unsigned msrc;		/* source address */
+static unsigned mval;		/* byte value to set memory to */
+static unsigned mcount;		/* # bytes to affect */
+static unsigned mdiffs;		/* max # differences to print */
+
+void
+memops(int cmd)
+{
+	scanhex(&mdest);
+	if( termch != '\n' )
+		termch = 0;
+	scanhex(cmd == 's'? &mval: &msrc);
+	if( termch != '\n' )
+		termch = 0;
+	scanhex(&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(&mdiffs);
+		memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs);
+		break;
+	}
+}
+
+void
+memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr)
+{
+	unsigned n, prt;
+
+	prt = 0;
+	for( n = nb; n > 0; --n )
+		if( *p1++ != *p2++ )
+			if( ++prt <= maxpr )
+				printf("%.8x %.2x # %.8x %.2x\n", (unsigned)p1 - 1,
+					p1[-1], (unsigned)p2 - 1, p2[-1]);
+	if( prt > maxpr )
+		printf("Total of %d differences\n", prt);
+}
+
+static unsigned mend;
+static unsigned mask;
+
+void
+memlocate()
+{
+	unsigned a, n;
+	unsigned char val[4];
+
+	last_cmd = "ml";
+	scanhex(&mdest);
+	if (termch != '\n') {
+		termch = 0;
+		scanhex(&mend);
+		if (termch != '\n') {
+			termch = 0;
+			scanhex(&mval);
+			mask = ~0;
+			if (termch != '\n') termch = 0;
+			scanhex(&mask);
+		}
+	}
+	n = 0;
+	for (a = mdest; a < mend; a += 4) {
+		if (mread(a, val, 4) == 4
+			&& ((GETWORD(val) ^ mval) & mask) == 0) {
+			printf("%.8x:  %.8x\n", a, GETWORD(val));
+			if (++n >= 10)
+				break;
+		}
+	}
+}
+
+static unsigned mskip = 0x1000;
+static unsigned mlim = 0xffffffff;
+
+void
+memzcan()
+{
+	unsigned char v;
+	unsigned a;
+	int ok, ook;
+
+	scanhex(&mdest);
+	if (termch != '\n') termch = 0;
+	scanhex(&mskip);
+	if (termch != '\n') termch = 0;
+	scanhex(&mlim);
+	ook = 0;
+	for (a = mdest; a < mlim; a += mskip) {
+		ok = mread(a, &v, 1);
+		if (ok && !ook) {
+			printf("%.8x .. ", a);
+			fflush(stdout);
+		} else if (!ok && ook)
+			printf("%.8x\n", a - mskip);
+		ook = ok;
+		if (a + mskip < a)
+			break;
+	}
+	if (ook)
+		printf("%.8x\n", a - mskip);
+}
+
+/* Input scanning routines */
+int
+skipbl()
+{
+	int c;
+
+	if( termch != 0 ){
+		c = termch;
+		termch = 0;
+	} else
+		c = inchar();
+	while( c == ' ' || c == '\t' )
+		c = inchar();
+	return c;
+}
+
+int
+scanhex(vp)
+unsigned *vp;
+{
+	int c, d;
+	unsigned v;
+
+	c = skipbl();
+	d = hexdigit(c);
+	if( d == EOF ){
+		termch = c;
+		return 0;
+	}
+	v = 0;
+	do {
+		v = (v << 4) + d;
+		c = inchar();
+		d = hexdigit(c);
+	} while( d != EOF );
+	termch = c;
+	*vp = v;
+	return 1;
+}
+
+void
+scannl()
+{
+	int c;
+
+	c = termch;
+	termch = 0;
+	while( c != '\n' )
+		c = inchar();
+}
+
+int
+hexdigit(c)
+{
+	if( '0' <= c && c <= '9' )
+		return c - '0';
+	if( 'A' <= c && c <= 'F' )
+		return c - ('A' - 10);
+	if( 'a' <= c && c <= 'f' )
+		return c - ('a' - 10);
+	return EOF;
+}
+
+void
+getstring(char *s, int size)
+{
+	int c;
+
+	c = skipbl();
+	do {
+		if( size > 1 ){
+			*s++ = c;
+			--size;
+		}
+		c = inchar();
+	} while( c != ' ' && c != '\t' && c != '\n' );
+	termch = c;
+	*s = 0;
+}
+
+static char line[256];
+static char *lineptr;
+
+void
+flush_input()
+{
+	lineptr = NULL;
+}
+
+int
+inchar()
+{
+	if (lineptr == NULL || *lineptr == 0) {
+		if (fgets(line, sizeof(line), stdin) == NULL) {
+			lineptr = NULL;
+			return EOF;
+		}
+		lineptr = line;
+	}
+	return *lineptr++;
+}
+
+void
+take_input(str)
+char *str;
+{
+	lineptr = str;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)