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linux/arch/ppc/xmon/xmon.c

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/*
* Routines providing a simple monitor for use on the PowerMac.
*
* Copyright (C) 1996 Paul Mackerras.
*/
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/kallsyms.h>
#include <asm/ptrace.h>
#include <asm/string.h>
#include <asm/machdep.h>
#include <asm/xmon.h>
#include "nonstdio.h"
#include "privinst.h"
#define scanhex xmon_scanhex
#define skipbl xmon_skipbl
#ifdef CONFIG_SMP
static unsigned long cpus_in_xmon = 0;
static unsigned long got_xmon = 0;
static volatile int take_xmon = -1;
#endif /* CONFIG_SMP */
static unsigned adrs;
static int size = 1;
static unsigned ndump = 64;
static unsigned nidump = 16;
static unsigned ncsum = 4096;
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 symbol_lookup(void);
static void remove_bpts(void);
static void insert_bpts(void);
static struct bpt *at_breakpoint(unsigned pc);
static void bpt_cmds(void);
void cacheflush(void);
#ifdef CONFIG_SMP
static void cpu_cmd(void);
#endif /* CONFIG_SMP */
static void csum(void);
static void bootcmds(void);
static void proccall(void);
static void printtime(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);
extern void xmon_enter(void);
extern void xmon_leave(void);
static unsigned start_tb[NR_CPUS][2];
static unsigned stop_tb[NR_CPUS][2];
#define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3])
#define isxdigit(c) (('0' <= (c) && (c) <= '9') \
|| ('a' <= (c) && (c) <= 'f') \
|| ('A' <= (c) && (c) <= 'F'))
#define isalnum(c) (('0' <= (c) && (c) <= '9') \
|| ('a' <= (c) && (c) <= 'z') \
|| ('A' <= (c) && (c) <= 'Z'))
#define isspace(c) (c == ' ' || c == '\t' || c == 10 || c == 13 || c == 0)
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\
la lookup address\n\
ls lookup symbol\n\
C checksum\n\
p call function with arguments\n\
T print time\n\
x exit monitor\n\
zr reboot\n\
zh halt\n\
";
static int xmon_trace[NR_CPUS];
#define SSTEP 1 /* stepping because of 's' command */
#define BRSTEP 2 /* stepping over breakpoint */
#ifdef CONFIG_4xx
#define MSR_SSTEP_ENABLE 0x200
#else
#define MSR_SSTEP_ENABLE 0x400
#endif
static struct pt_regs *xmon_regs[NR_CPUS];
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");
}
/* Print an address in numeric and symbolic form (if possible) */
static void xmon_print_symbol(unsigned long address, const char *mid,
const char *after)
{
char *modname;
const char *name = NULL;
unsigned long offset, size;
static char tmpstr[128];
printf("%.8lx", address);
if (setjmp(bus_error_jmp) == 0) {
debugger_fault_handler = handle_fault;
sync();
name = kallsyms_lookup(address, &size, &offset, &modname,
tmpstr);
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
}
debugger_fault_handler = NULL;
if (name) {
printf("%s%s+%#lx/%#lx", mid, name, offset, size);
if (modname)
printf(" [%s]", modname);
}
printf("%s", after);
}
static void get_tb(unsigned *p)
{
unsigned hi, lo, hiagain;
if ((get_pvr() >> 16) == 1)
return;
do {
asm volatile("mftbu %0; mftb %1; mftbu %2"
: "=r" (hi), "=r" (lo), "=r" (hiagain));
} while (hi != hiagain);
p[0] = hi;
p[1] = lo;
}
static inline void xmon_enable_sstep(struct pt_regs *regs)
{
regs->msr |= MSR_SSTEP_ENABLE;
#ifdef CONFIG_4xx
mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
#endif
}
int xmon(struct pt_regs *excp)
{
struct pt_regs regs;
int msr, cmd;
get_tb(stop_tb[smp_processor_id()]);
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 */
xmon_regs[smp_processor_id()] = excp;
xmon_enter();
excprint(excp);
#ifdef CONFIG_SMP
if (test_and_set_bit(smp_processor_id(), &cpus_in_xmon))
for (;;)
;
while (test_and_set_bit(0, &got_xmon)) {
if (take_xmon == smp_processor_id()) {
take_xmon = -1;
break;
}
}
/*
* XXX: breakpoints are removed while any cpu is in xmon
*/
#endif /* CONFIG_SMP */
remove_bpts();
cmd = cmds(excp);
if (cmd == 's') {
xmon_trace[smp_processor_id()] = SSTEP;
xmon_enable_sstep(excp);
} else if (at_breakpoint(excp->nip)) {
xmon_trace[smp_processor_id()] = BRSTEP;
xmon_enable_sstep(excp);
} else {
xmon_trace[smp_processor_id()] = 0;
insert_bpts();
}
xmon_leave();
xmon_regs[smp_processor_id()] = NULL;
#ifdef CONFIG_SMP
clear_bit(0, &got_xmon);
clear_bit(smp_processor_id(), &cpus_in_xmon);
#endif /* CONFIG_SMP */
set_msr(msr); /* restore interrupt enable */
get_tb(start_tb[smp_processor_id()]);
return cmd != 'X';
}
irqreturn_t
xmon_irq(int irq, void *d, struct pt_regs *regs)
{
unsigned long flags;
local_irq_save(flags);
printf("Keyboard interrupt\n");
xmon(regs);
local_irq_restore(flags);
return IRQ_HANDLED;
}
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[smp_processor_id()] = BRSTEP;
xmon_enable_sstep(regs);
} else {
xmon(regs);
}
return 1;
}
int
xmon_sstep(struct pt_regs *regs)
{
if (!xmon_trace[smp_processor_id()])
return 0;
if (xmon_trace[smp_processor_id()] == BRSTEP) {
xmon_trace[smp_processor_id()] = 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[smp_processor_id()] = 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[smp_processor_id()] = 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 NULL;
}
static void
insert_bpts(void)
{
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;
}
store_inst((void *) bp->address);
}
#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
if (dabr.enabled)
set_dabr(dabr.address);
if (iabr.enabled)
set_iabr(iabr.address);
#endif
}
static void
remove_bpts(void)
{
int i;
struct bpt *bp;
unsigned instr;
#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
set_dabr(0);
set_iabr(0);
#endif
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);
store_inst((void *) bp->address);
}
}
static char *last_cmd;
/* Command interpreting routine */
static int
cmds(struct pt_regs *excp)
{
int cmd;
last_cmd = NULL;
for(;;) {
#ifdef CONFIG_SMP
printf("%d:", smp_processor_id());
#endif /* CONFIG_SMP */
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 'l':
symbol_lookup();
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;
case 'f':
cacheflush();
break;
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;
case 'C':
csum();
break;
#ifdef CONFIG_SMP
case 'c':
cpu_cmd();
break;
#endif /* CONFIG_SMP */
case 'z':
bootcmds();
break;
case 'p':
proccall();
break;
case 'T':
printtime();
break;
}
}
}
extern unsigned tb_to_us;
#define mulhwu(x,y) \
({unsigned z; asm ("mulhwu %0,%1,%2" : "=r" (z) : "r" (x), "r" (y)); z;})
static void printtime(void)
{
unsigned int delta;
delta = stop_tb[smp_processor_id()][1]
- start_tb[smp_processor_id()][1];
delta = mulhwu(tb_to_us, delta);
printf("%u.%06u seconds\n", delta / 1000000, delta % 1000000);
}
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 cpu;
int timeout;
int cmd;
cmd = inchar();
if (cmd == 'i') {
/* interrupt other cpu(s) */
cpu = MSG_ALL_BUT_SELF;
if (scanhex(&cpu))
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(" %d", 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 void
bpt_cmds(void)
{
int cmd;
unsigned a;
int mode, i;
struct bpt *bp;
cmd = inchar();
switch (cmd) {
#if ! (defined(CONFIG_8xx) || defined(CONFIG_4xx))
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;
printf("[%.8lx] ", stack[0]);
xmon_print_symbol(stack[1], " ", "\n");
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("exception:%x [%x] %x\n", regs.trap, sp+16,
regs.nip);
sp = regs.gpr[1];
if (mread(sp, stack, sizeof(stack)) != sizeof(stack))
break;
}
}
}
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);
xmon_print_symbol(fp->nip, ": ", ", lr=");
xmon_print_symbol(fp->link, ": ", "\n");
printf("msr = %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
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
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 = 0;
int found, last_found, i;
unsigned *hg, w1, last_w2 = 0, last_va0 = 0;
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(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;
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(void)
{
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;
}
void
dump(void)
{
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 = 0;
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(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(void)
{
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(void)
{
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);
}
void proccall(void)
{
unsigned int args[8];
unsigned int ret;
int i;
typedef unsigned int (*callfunc_t)(unsigned int, unsigned int,
unsigned int, unsigned int, unsigned int,
unsigned int, unsigned int, unsigned int);
callfunc_t func;
scanhex(&adrs);
if (termch != '\n')
termch = 0;
for (i = 0; i < 8; ++i)
args[i] = 0;
for (i = 0; i < 8; ++i) {
if (!scanhex(&args[i]) || termch == '\n')
break;
termch = 0;
}
func = (callfunc_t) adrs;
ret = 0;
if (setjmp(bus_error_jmp) == 0) {
debugger_fault_handler = handle_fault;
sync();
ret = func(args[0], args[1], args[2], args[3],
args[4], args[5], args[6], args[7]);
sync();
printf("return value is %x\n", ret);
} else {
printf("*** %x exception occurred\n", fault_except);
}
debugger_fault_handler = NULL;
}
/* Input scanning routines */
int
skipbl(void)
{
int c;
if( termch != 0 ){
c = termch;
termch = 0;
} else
c = inchar();
while( c == ' ' || c == '\t' )
c = inchar();
return c;
}
#define N_PTREGS 44
static char *regnames[N_PTREGS] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
"r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
"pc", "msr", "or3", "ctr", "lr", "xer", "ccr", "mq",
"trap", "dar", "dsisr", "res"
};
int
scanhex(unsigned *vp)
{
int c, d;
unsigned v;
c = skipbl();
if (c == '%') {
/* parse register name */
char regname[8];
int i;
for (i = 0; i < sizeof(regname) - 1; ++i) {
c = inchar();
if (!isalnum(c)) {
termch = c;
break;
}
regname[i] = c;
}
regname[i] = 0;
for (i = 0; i < N_PTREGS; ++i) {
if (strcmp(regnames[i], regname) == 0) {
unsigned *rp = (unsigned *)
xmon_regs[smp_processor_id()];
if (rp == NULL) {
printf("regs not available\n");
return 0;
}
*vp = rp[i];
return 1;
}
}
printf("invalid register name '%%%s'\n", regname);
return 0;
} else if (c == '$') {
static char symname[128];
int i;
for (i=0; i<63; i++) {
c = inchar();
if (isspace(c)) {
termch = c;
break;
}
symname[i] = c;
}
symname[i++] = 0;
*vp = 0;
if (setjmp(bus_error_jmp) == 0) {
debugger_fault_handler = handle_fault;
sync();
*vp = kallsyms_lookup_name(symname);
sync();
}
debugger_fault_handler = NULL;
if (!(*vp)) {
printf("unknown symbol\n");
return 0;
}
return 1;
}
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(void)
{
int c;
c = termch;
termch = 0;
while( c != '\n' )
c = inchar();
}
int hexdigit(int 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(void)
{
lineptr = NULL;
}
int
inchar(void)
{
if (lineptr == NULL || *lineptr == 0) {
if (fgets(line, sizeof(line), stdin) == NULL) {
lineptr = NULL;
return EOF;
}
lineptr = line;
}
return *lineptr++;
}
void
take_input(char *str)
{
lineptr = str;
}
static void
symbol_lookup(void)
{
int type = inchar();
unsigned addr;
static char tmp[128];
switch (type) {
case 'a':
if (scanhex(&addr))
xmon_print_symbol(addr, ": ", "\n");
termch = 0;
break;
case 's':
getstring(tmp, 64);
if (setjmp(bus_error_jmp) == 0) {
debugger_fault_handler = handle_fault;
sync();
addr = kallsyms_lookup_name(tmp);
if (addr)
printf("%s: %lx\n", tmp, addr);
else
printf("Symbol '%s' not found.\n", tmp);
sync();
}
debugger_fault_handler = NULL;
termch = 0;
break;
}
}
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