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linux_dsm_epyc7002/arch/powerpc/xmon/xmon.c
Paul Mackerras fca5dcd483 powerpc: Simplify and clean up the xmon terminal I/O 
This factors out the common bits of arch/powerpc/xmon/start_*.c into
a new nonstdio.c, and removes some stuff that was supposed to make
xmon's I/O routines somewhat stdio-like but was never used.

It also makes the parsing of the xmon= command line option common,
so that ppc32 can now use xmon={off,on,early} also.

Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-11-08 22:55:08 +11:00

2549 lines
53 KiB
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/*
* Routines providing a simple monitor for use on the PowerMac.
*
* Copyright (C) 1996-2005 Paul Mackerras.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/kallsyms.h>
#include <linux/cpumask.h>
#include <linux/module.h>
#include <linux/sysrq.h>
#include <asm/ptrace.h>
#include <asm/string.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/xmon.h>
#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#include <asm/mmu_context.h>
#include <asm/cputable.h>
#include <asm/rtas.h>
#include <asm/sstep.h>
#include <asm/bug.h>
#ifdef CONFIG_PPC64
#include <asm/hvcall.h>
#include <asm/paca.h>
#endif
#include "nonstdio.h"
#define scanhex xmon_scanhex
#define skipbl xmon_skipbl
#ifdef CONFIG_SMP
cpumask_t cpus_in_xmon = CPU_MASK_NONE;
static unsigned long xmon_taken = 1;
static int xmon_owner;
static int xmon_gate;
#endif /* CONFIG_SMP */
static unsigned long in_xmon = 0;
static unsigned long adrs;
static int size = 1;
#define MAX_DUMP (128 * 1024)
static unsigned long ndump = 64;
static unsigned long nidump = 16;
static unsigned long ncsum = 4096;
static int termch;
static char tmpstr[128];
#define JMP_BUF_LEN 23
static long bus_error_jmp[JMP_BUF_LEN];
static int catch_memory_errors;
static long *xmon_fault_jmp[NR_CPUS];
#define setjmp xmon_setjmp
#define longjmp xmon_longjmp
/* Breakpoint stuff */
struct bpt {
unsigned long address;
unsigned int instr[2];
atomic_t ref_count;
int enabled;
unsigned long pad;
};
/* Bits in bpt.enabled */
#define BP_IABR_TE 1 /* IABR translation enabled */
#define BP_IABR 2
#define BP_TRAP 8
#define BP_DABR 0x10
#define NBPTS 256
static struct bpt bpts[NBPTS];
static struct bpt dabr;
static struct bpt *iabr;
static unsigned bpinstr = 0x7fe00008; /* trap */
#define BP_NUM(bp) ((bp) - bpts + 1)
/* Prototypes */
static int cmds(struct pt_regs *);
static int mread(unsigned long, void *, int);
static int mwrite(unsigned long, void *, int);
static int 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 long, long);
static int ppc_inst_dump(unsigned long, long, int);
void print_address(unsigned long);
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 long *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 unsigned long read_spr(int);
static void write_spr(int, unsigned long);
static void super_regs(void);
static void remove_bpts(void);
static void insert_bpts(void);
static void remove_cpu_bpts(void);
static void insert_cpu_bpts(void);
static struct bpt *at_breakpoint(unsigned long pc);
static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp);
static int do_step(struct pt_regs *);
static void bpt_cmds(void);
static void cacheflush(void);
static int cpu_cmd(void);
static void csum(void);
static void bootcmds(void);
static void proccall(void);
void dump_segments(void);
static void symbol_lookup(void);
static void xmon_print_symbol(unsigned long address, const char *mid,
const char *after);
static const char *getvecname(unsigned long vec);
extern int print_insn_powerpc(unsigned long, unsigned long, int);
extern void xmon_enter(void);
extern void xmon_leave(void);
extern long setjmp(long *);
extern void longjmp(long *, long);
extern void xmon_save_regs(struct pt_regs *);
#ifdef CONFIG_PPC64
#define REG "%.16lx"
#define REGS_PER_LINE 4
#define LAST_VOLATILE 13
#else
#define REG "%.8lx"
#define REGS_PER_LINE 8
#define LAST_VOLATILE 12
#endif
#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\
b show breakpoints\n\
bd set data breakpoint\n\
bi set instruction breakpoint\n\
bc clear breakpoint\n"
#ifdef CONFIG_SMP
"\
c print cpus stopped in xmon\n\
c# try to switch to cpu number h (in hex)\n"
#endif
"\
C checksum\n\
d dump bytes\n\
di dump instructions\n\
df dump float values\n\
dd dump double values\n\
e print exception information\n\
f flush cache\n\
la lookup symbol+offset of specified address\n\
ls lookup address of specified symbol\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\
ml locate a block of memory\n\
mz zero a block of memory\n\
mi show information about memory allocation\n\
p call a procedure\n\
r print registers\n\
s single step\n\
S print special registers\n\
t print backtrace\n\
x exit monitor and recover\n\
X exit monitor and dont recover\n"
#ifdef CONFIG_PPC64
" u dump segment table or SLB\n"
#endif
#ifdef CONFIG_PPC_STD_MMU_32
" u dump segment registers\n"
#endif
" ? help\n"
" zr reboot\n\
zh halt\n"
;
static struct pt_regs *xmon_regs;
static inline void sync(void)
{
asm volatile("sync; isync");
}
static inline void store_inst(void *p)
{
asm volatile ("dcbst 0,%0; sync; icbi 0,%0; isync" : : "r" (p));
}
static inline void cflush(void *p)
{
asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p));
}
static inline void cinval(void *p)
{
asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p));
}
/*
* Disable surveillance (the service processor watchdog function)
* while we are in xmon.
* XXX we should re-enable it when we leave. :)
*/
#define SURVEILLANCE_TOKEN 9000
static inline void disable_surveillance(void)
{
#ifdef CONFIG_PPC_PSERIES
/* Since this can't be a module, args should end up below 4GB. */
static struct rtas_args args;
/*
* At this point we have got all the cpus we can into
* xmon, so there is hopefully no other cpu calling RTAS
* at the moment, even though we don't take rtas.lock.
* If we did try to take rtas.lock there would be a
* real possibility of deadlock.
*/
args.token = rtas_token("set-indicator");
if (args.token == RTAS_UNKNOWN_SERVICE)
return;
args.nargs = 3;
args.nret = 1;
args.rets = &args.args[3];
args.args[0] = SURVEILLANCE_TOKEN;
args.args[1] = 0;
args.args[2] = 0;
enter_rtas(__pa(&args));
#endif /* CONFIG_PPC_PSERIES */
}
#ifdef CONFIG_SMP
static int xmon_speaker;
static void get_output_lock(void)
{
int me = smp_processor_id() + 0x100;
int last_speaker = 0, prev;
long timeout;
if (xmon_speaker == me)
return;
for (;;) {
if (xmon_speaker == 0) {
last_speaker = cmpxchg(&xmon_speaker, 0, me);
if (last_speaker == 0)
return;
}
timeout = 10000000;
while (xmon_speaker == last_speaker) {
if (--timeout > 0)
continue;
/* hostile takeover */
prev = cmpxchg(&xmon_speaker, last_speaker, me);
if (prev == last_speaker)
return;
break;
}
}
}
static void release_output_lock(void)
{
xmon_speaker = 0;
}
#endif
int xmon_core(struct pt_regs *regs, int fromipi)
{
int cmd = 0;
unsigned long msr;
struct bpt *bp;
long recurse_jmp[JMP_BUF_LEN];
unsigned long offset;
#ifdef CONFIG_SMP
int cpu;
int secondary;
unsigned long timeout;
#endif
msr = mfmsr();
mtmsr(msr & ~MSR_EE); /* disable interrupts */
bp = in_breakpoint_table(regs->nip, &offset);
if (bp != NULL) {
regs->nip = bp->address + offset;
atomic_dec(&bp->ref_count);
}
remove_cpu_bpts();
#ifdef CONFIG_SMP
cpu = smp_processor_id();
if (cpu_isset(cpu, cpus_in_xmon)) {
get_output_lock();
excprint(regs);
printf("cpu 0x%x: Exception %lx %s in xmon, "
"returning to main loop\n",
cpu, regs->trap, getvecname(TRAP(regs)));
release_output_lock();
longjmp(xmon_fault_jmp[cpu], 1);
}
if (setjmp(recurse_jmp) != 0) {
if (!in_xmon || !xmon_gate) {
get_output_lock();
printf("xmon: WARNING: bad recursive fault "
"on cpu 0x%x\n", cpu);
release_output_lock();
goto waiting;
}
secondary = !(xmon_taken && cpu == xmon_owner);
goto cmdloop;
}
xmon_fault_jmp[cpu] = recurse_jmp;
cpu_set(cpu, cpus_in_xmon);
bp = NULL;
if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF))
bp = at_breakpoint(regs->nip);
if (bp || (regs->msr & MSR_RI) == 0)
fromipi = 0;
if (!fromipi) {
get_output_lock();
excprint(regs);
if (bp) {
printf("cpu 0x%x stopped at breakpoint 0x%x (",
cpu, BP_NUM(bp));
xmon_print_symbol(regs->nip, " ", ")\n");
}
if ((regs->msr & MSR_RI) == 0)
printf("WARNING: exception is not recoverable, "
"can't continue\n");
release_output_lock();
}
waiting:
secondary = 1;
while (secondary && !xmon_gate) {
if (in_xmon == 0) {
if (fromipi)
goto leave;
secondary = test_and_set_bit(0, &in_xmon);
}
barrier();
}
if (!secondary && !xmon_gate) {
/* we are the first cpu to come in */
/* interrupt other cpu(s) */
int ncpus = num_online_cpus();
xmon_owner = cpu;
mb();
if (ncpus > 1) {
smp_send_debugger_break(MSG_ALL_BUT_SELF);
/* wait for other cpus to come in */
for (timeout = 100000000; timeout != 0; --timeout) {
if (cpus_weight(cpus_in_xmon) >= ncpus)
break;
barrier();
}
}
remove_bpts();
disable_surveillance();
/* for breakpoint or single step, print the current instr. */
if (bp || TRAP(regs) == 0xd00)
ppc_inst_dump(regs->nip, 1, 0);
printf("enter ? for help\n");
mb();
xmon_gate = 1;
barrier();
}
cmdloop:
while (in_xmon) {
if (secondary) {
if (cpu == xmon_owner) {
if (!test_and_set_bit(0, &xmon_taken)) {
secondary = 0;
continue;
}
/* missed it */
while (cpu == xmon_owner)
barrier();
}
barrier();
} else {
cmd = cmds(regs);
if (cmd != 0) {
/* exiting xmon */
insert_bpts();
xmon_gate = 0;
wmb();
in_xmon = 0;
break;
}
/* have switched to some other cpu */
secondary = 1;
}
}
leave:
cpu_clear(cpu, cpus_in_xmon);
xmon_fault_jmp[cpu] = NULL;
#else
/* UP is simple... */
if (in_xmon) {
printf("Exception %lx %s in xmon, returning to main loop\n",
regs->trap, getvecname(TRAP(regs)));
longjmp(xmon_fault_jmp[0], 1);
}
if (setjmp(recurse_jmp) == 0) {
xmon_fault_jmp[0] = recurse_jmp;
in_xmon = 1;
excprint(regs);
bp = at_breakpoint(regs->nip);
if (bp) {
printf("Stopped at breakpoint %x (", BP_NUM(bp));
xmon_print_symbol(regs->nip, " ", ")\n");
}
if ((regs->msr & MSR_RI) == 0)
printf("WARNING: exception is not recoverable, "
"can't continue\n");
remove_bpts();
disable_surveillance();
/* for breakpoint or single step, print the current instr. */
if (bp || TRAP(regs) == 0xd00)
ppc_inst_dump(regs->nip, 1, 0);
printf("enter ? for help\n");
}
cmd = cmds(regs);
insert_bpts();
in_xmon = 0;
#endif
if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF)) {
bp = at_breakpoint(regs->nip);
if (bp != NULL) {
int stepped = emulate_step(regs, bp->instr[0]);
if (stepped == 0) {
regs->nip = (unsigned long) &bp->instr[0];
atomic_inc(&bp->ref_count);
} else if (stepped < 0) {
printf("Couldn't single-step %s instruction\n",
(IS_RFID(bp->instr[0])? "rfid": "mtmsrd"));
}
}
}
insert_cpu_bpts();
mtmsr(msr); /* restore interrupt enable */
return cmd != 'X';
}
int xmon(struct pt_regs *excp)
{
struct pt_regs regs;
if (excp == NULL) {
xmon_save_regs(&regs);
excp = &regs;
}
return xmon_core(excp, 0);
}
EXPORT_SYMBOL(xmon);
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;
unsigned long offset;
if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) != (MSR_IR|MSR_SF))
return 0;
/* Are we at the trap at bp->instr[1] for some bp? */
bp = in_breakpoint_table(regs->nip, &offset);
if (bp != NULL && offset == 4) {
regs->nip = bp->address + 4;
atomic_dec(&bp->ref_count);
return 1;
}
/* Are we at a breakpoint? */
bp = at_breakpoint(regs->nip);
if (!bp)
return 0;
xmon_core(regs, 0);
return 1;
}
int xmon_sstep(struct pt_regs *regs)
{
if (user_mode(regs))
return 0;
xmon_core(regs, 0);
return 1;
}
int xmon_dabr_match(struct pt_regs *regs)
{
if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) != (MSR_IR|MSR_SF))
return 0;
if (dabr.enabled == 0)
return 0;
xmon_core(regs, 0);
return 1;
}
int xmon_iabr_match(struct pt_regs *regs)
{
if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) != (MSR_IR|MSR_SF))
return 0;
if (iabr == 0)
return 0;
xmon_core(regs, 0);
return 1;
}
int xmon_ipi(struct pt_regs *regs)
{
#ifdef CONFIG_SMP
if (in_xmon && !cpu_isset(smp_processor_id(), cpus_in_xmon))
xmon_core(regs, 1);
#endif
return 0;
}
int xmon_fault_handler(struct pt_regs *regs)
{
struct bpt *bp;
unsigned long offset;
if (in_xmon && catch_memory_errors)
handle_fault(regs); /* doesn't return */
if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF)) {
bp = in_breakpoint_table(regs->nip, &offset);
if (bp != NULL) {
regs->nip = bp->address + offset;
atomic_dec(&bp->ref_count);
}
}
return 0;
}
static struct bpt *at_breakpoint(unsigned long pc)
{
int i;
struct bpt *bp;
bp = bpts;
for (i = 0; i < NBPTS; ++i, ++bp)
if (bp->enabled && pc == bp->address)
return bp;
return NULL;
}
static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp)
{
unsigned long off;
off = nip - (unsigned long) bpts;
if (off >= sizeof(bpts))
return NULL;
off %= sizeof(struct bpt);
if (off != offsetof(struct bpt, instr[0])
&& off != offsetof(struct bpt, instr[1]))
return NULL;
*offp = off - offsetof(struct bpt, instr[0]);
return (struct bpt *) (nip - off);
}
static struct bpt *new_breakpoint(unsigned long a)
{
struct bpt *bp;
a &= ~3UL;
bp = at_breakpoint(a);
if (bp)
return bp;
for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
if (!bp->enabled && atomic_read(&bp->ref_count) == 0) {
bp->address = a;
bp->instr[1] = bpinstr;
store_inst(&bp->instr[1]);
return bp;
}
}
printf("Sorry, no free breakpoints. Please clear one first.\n");
return NULL;
}
static void insert_bpts(void)
{
int i;
struct bpt *bp;
bp = bpts;
for (i = 0; i < NBPTS; ++i, ++bp) {
if ((bp->enabled & (BP_TRAP|BP_IABR)) == 0)
continue;
if (mread(bp->address, &bp->instr[0], 4) != 4) {
printf("Couldn't read instruction at %lx, "
"disabling breakpoint there\n", bp->address);
bp->enabled = 0;
continue;
}
if (IS_MTMSRD(bp->instr[0]) || IS_RFID(bp->instr[0])) {
printf("Breakpoint at %lx is on an mtmsrd or rfid "
"instruction, disabling it\n", bp->address);
bp->enabled = 0;
continue;
}
store_inst(&bp->instr[0]);
if (bp->enabled & BP_IABR)
continue;
if (mwrite(bp->address, &bpinstr, 4) != 4) {
printf("Couldn't write instruction at %lx, "
"disabling breakpoint there\n", bp->address);
bp->enabled &= ~BP_TRAP;
continue;
}
store_inst((void *)bp->address);
}
}
static void insert_cpu_bpts(void)
{
if (dabr.enabled)
set_dabr(dabr.address | (dabr.enabled & 7));
if (iabr && cpu_has_feature(CPU_FTR_IABR))
mtspr(SPRN_IABR, iabr->address
| (iabr->enabled & (BP_IABR|BP_IABR_TE)));
}
static void remove_bpts(void)
{
int i;
struct bpt *bp;
unsigned instr;
bp = bpts;
for (i = 0; i < NBPTS; ++i, ++bp) {
if ((bp->enabled & (BP_TRAP|BP_IABR)) != BP_TRAP)
continue;
if (mread(bp->address, &instr, 4) == 4
&& instr == bpinstr
&& mwrite(bp->address, &bp->instr, 4) != 4)
printf("Couldn't remove breakpoint at %lx\n",
bp->address);
else
store_inst((void *)bp->address);
}
}
static void remove_cpu_bpts(void)
{
set_dabr(0);
if (cpu_has_feature(CPU_FTR_IABR))
mtspr(SPRN_IABR, 0);
}
/* Command interpreting routine */
static char *last_cmd;
static int
cmds(struct pt_regs *excp)
{
int cmd = 0;
last_cmd = NULL;
xmon_regs = excp;
for(;;) {
#ifdef CONFIG_SMP
printf("%x:", smp_processor_id());
#endif /* CONFIG_SMP */
printf("mon> ");
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;
case 'i':
show_mem();
break;
default:
termch = cmd;
memex();
}
break;
case 'd':
dump();
break;
case 'l':
symbol_lookup();
break;
case 'r':
prregs(excp); /* print regs */
break;
case 'e':
excprint(excp);
break;
case 'S':
super_regs();
break;
case 't':
backtrace(excp);
break;
case 'f':
cacheflush();
break;
case 's':
if (do_step(excp))
return cmd;
break;
case 'x':
case 'X':
case EOF:
return cmd;
case '?':
printf(help_string);
break;
case 'b':
bpt_cmds();
break;
case 'C':
csum();
break;
case 'c':
if (cpu_cmd())
return 0;
break;
case 'z':
bootcmds();
break;
case 'p':
proccall();
break;
#ifdef CONFIG_PPC_STD_MMU
case 'u':
dump_segments();
break;
#endif
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;
}
}
}
/*
* Step a single instruction.
* Some instructions we emulate, others we execute with MSR_SE set.
*/
static int do_step(struct pt_regs *regs)
{
unsigned int instr;
int stepped;
/* check we are in 64-bit kernel mode, translation enabled */
if ((regs->msr & (MSR_SF|MSR_PR|MSR_IR)) == (MSR_SF|MSR_IR)) {
if (mread(regs->nip, &instr, 4) == 4) {
stepped = emulate_step(regs, instr);
if (stepped < 0) {
printf("Couldn't single-step %s instruction\n",
(IS_RFID(instr)? "rfid": "mtmsrd"));
return 0;
}
if (stepped > 0) {
regs->trap = 0xd00 | (regs->trap & 1);
printf("stepped to ");
xmon_print_symbol(regs->nip, " ", "\n");
ppc_inst_dump(regs->nip, 1, 0);
return 0;
}
}
}
regs->msr |= MSR_SE;
return 1;
}
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();
}
static int cpu_cmd(void)
{
#ifdef CONFIG_SMP
unsigned long cpu;
int timeout;
int count;
if (!scanhex(&cpu)) {
/* print cpus waiting or in xmon */
printf("cpus stopped:");
count = 0;
for (cpu = 0; cpu < NR_CPUS; ++cpu) {
if (cpu_isset(cpu, cpus_in_xmon)) {
if (count == 0)
printf(" %x", cpu);
++count;
} else {
if (count > 1)
printf("-%x", cpu - 1);
count = 0;
}
}
if (count > 1)
printf("-%x", NR_CPUS - 1);
printf("\n");
return 0;
}
/* try to switch to cpu specified */
if (!cpu_isset(cpu, cpus_in_xmon)) {
printf("cpu 0x%x isn't in xmon\n", cpu);
return 0;
}
xmon_taken = 0;
mb();
xmon_owner = cpu;
timeout = 10000000;
while (!xmon_taken) {
if (--timeout == 0) {
if (test_and_set_bit(0, &xmon_taken))
break;
/* take control back */
mb();
xmon_owner = smp_processor_id();
printf("cpu %u didn't take control\n", cpu);
return 0;
}
barrier();
}
return 1;
#else
return 0;
#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);
}
/*
* Check if this is a suitable place to put a breakpoint.
*/
static long check_bp_loc(unsigned long addr)
{
unsigned int instr;
addr &= ~3;
if (addr < KERNELBASE) {
printf("Breakpoints may only be placed at kernel addresses\n");
return 0;
}
if (!mread(addr, &instr, sizeof(instr))) {
printf("Can't read instruction at address %lx\n", addr);
return 0;
}
if (IS_MTMSRD(instr) || IS_RFID(instr)) {
printf("Breakpoints may not be placed on mtmsrd or rfid "
"instructions\n");
return 0;
}
return 1;
}
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 (POWER3/RS64 only)\n"
"bd <addr> [cnt] set hardware data breakpoint\n"
"";
static void
bpt_cmds(void)
{
int cmd;
unsigned long a;
int mode, i;
struct bpt *bp;
const char badaddr[] = "Only kernel addresses are permitted "
"for breakpoints\n";
cmd = inchar();
switch (cmd) {
#ifndef CONFIG_8xx
case 'd': /* bd - hardware data breakpoint */
mode = 7;
cmd = inchar();
if (cmd == 'r')
mode = 5;
else if (cmd == 'w')
mode = 6;
else
termch = cmd;
dabr.address = 0;
dabr.enabled = 0;
if (scanhex(&dabr.address)) {
if (dabr.address < KERNELBASE) {
printf(badaddr);
break;
}
dabr.address &= ~7;
dabr.enabled = mode | BP_DABR;
}
break;
case 'i': /* bi - hardware instr breakpoint */
if (!cpu_has_feature(CPU_FTR_IABR)) {
printf("Hardware instruction breakpoint "
"not supported on this cpu\n");
break;
}
if (iabr) {
iabr->enabled &= ~(BP_IABR | BP_IABR_TE);
iabr = NULL;
}
if (!scanhex(&a))
break;
if (!check_bp_loc(a))
break;
bp = new_breakpoint(a);
if (bp != NULL) {
bp->enabled |= BP_IABR | BP_IABR_TE;
iabr = bp;
}
break;
#endif
case 'c':
if (!scanhex(&a)) {
/* clear all breakpoints */
for (i = 0; i < NBPTS; ++i)
bpts[i].enabled = 0;
iabr = NULL;
dabr.enabled = 0;
printf("All breakpoints cleared\n");
break;
}
if (a <= NBPTS && a >= 1) {
/* assume a breakpoint number */
bp = &bpts[a-1]; /* bp nums are 1 based */
} else {
/* assume a breakpoint address */
bp = at_breakpoint(a);
if (bp == 0) {
printf("No breakpoint at %x\n", a);
break;
}
}
printf("Cleared breakpoint %x (", BP_NUM(bp));
xmon_print_symbol(bp->address, " ", ")\n");
bp->enabled = 0;
break;
default:
termch = cmd;
cmd = skipbl();
if (cmd == '?') {
printf(breakpoint_help_string);
break;
}
termch = cmd;
if (!scanhex(&a)) {
/* print all breakpoints */
printf(" type address\n");
if (dabr.enabled) {
printf(" data "REG" [", dabr.address);
if (dabr.enabled & 1)
printf("r");
if (dabr.enabled & 2)
printf("w");
printf("]\n");
}
for (bp = bpts; bp < &bpts[NBPTS]; ++bp) {
if (!bp->enabled)
continue;
printf("%2x %s ", BP_NUM(bp),
(bp->enabled & BP_IABR)? "inst": "trap");
xmon_print_symbol(bp->address, " ", "\n");
}
break;
}
if (!check_bp_loc(a))
break;
bp = new_breakpoint(a);
if (bp != NULL)
bp->enabled |= BP_TRAP;
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;
case 0xf20: ret = "(Altivec Unavailable)"; break;
case 0x1300: ret = "(Instruction Breakpoint)"; break;
default: ret = "";
}
return ret;
}
static void get_function_bounds(unsigned long pc, unsigned long *startp,
unsigned long *endp)
{
unsigned long size, offset;
const char *name;
char *modname;
*startp = *endp = 0;
if (pc == 0)
return;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
name = kallsyms_lookup(pc, &size, &offset, &modname, tmpstr);
if (name != NULL) {
*startp = pc - offset;
*endp = pc - offset + size;
}
sync();
}
catch_memory_errors = 0;
}
static int xmon_depth_to_print = 64;
#ifdef CONFIG_PPC64
#define LRSAVE_OFFSET 0x10
#define REG_FRAME_MARKER 0x7265677368657265ul /* "regshere" */
#define MARKER_OFFSET 0x60
#define REGS_OFFSET 0x70
#else
#define LRSAVE_OFFSET 4
#define REG_FRAME_MARKER 0x72656773
#define MARKER_OFFSET 8
#define REGS_OFFSET 16
#endif
static void xmon_show_stack(unsigned long sp, unsigned long lr,
unsigned long pc)
{
unsigned long ip;
unsigned long newsp;
unsigned long marker;
int count = 0;
struct pt_regs regs;
do {
if (sp < PAGE_OFFSET) {
if (sp != 0)
printf("SP (%lx) is in userspace\n", sp);
break;
}
if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long))
|| !mread(sp, &newsp, sizeof(unsigned long))) {
printf("Couldn't read stack frame at %lx\n", sp);
break;
}
/*
* For the first stack frame, try to work out if
* LR and/or the saved LR value in the bottommost
* stack frame are valid.
*/
if ((pc | lr) != 0) {
unsigned long fnstart, fnend;
unsigned long nextip;
int printip = 1;
get_function_bounds(pc, &fnstart, &fnend);
nextip = 0;
if (newsp > sp)
mread(newsp + LRSAVE_OFFSET, &nextip,
sizeof(unsigned long));
if (lr == ip) {
if (lr < PAGE_OFFSET
|| (fnstart <= lr && lr < fnend))
printip = 0;
} else if (lr == nextip) {
printip = 0;
} else if (lr >= PAGE_OFFSET
&& !(fnstart <= lr && lr < fnend)) {
printf("[link register ] ");
xmon_print_symbol(lr, " ", "\n");
}
if (printip) {
printf("["REG"] ", sp);
xmon_print_symbol(ip, " ", " (unreliable)\n");
}
pc = lr = 0;
} else {
printf("["REG"] ", sp);
xmon_print_symbol(ip, " ", "\n");
}
/* Look for "regshere" marker to see if this is
an exception frame. */
if (mread(sp + MARKER_OFFSET, &marker, sizeof(unsigned long))
&& marker == REG_FRAME_MARKER) {
if (mread(sp + REGS_OFFSET, &regs, sizeof(regs))
!= sizeof(regs)) {
printf("Couldn't read registers at %lx\n",
sp + REGS_OFFSET);
break;
}
printf("--- Exception: %lx %s at ", regs.trap,
getvecname(TRAP(&regs)));
pc = regs.nip;
lr = regs.link;
xmon_print_symbol(pc, " ", "\n");
}
if (newsp == 0)
break;
sp = newsp;
} while (count++ < xmon_depth_to_print);
}
static void backtrace(struct pt_regs *excp)
{
unsigned long sp;
if (scanhex(&sp))
xmon_show_stack(sp, 0, 0);
else
xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
scannl();
}
static void print_bug_trap(struct pt_regs *regs)
{
struct bug_entry *bug;
unsigned long addr;
if (regs->msr & MSR_PR)
return; /* not in kernel */
addr = regs->nip; /* address of trap instruction */
if (addr < PAGE_OFFSET)
return;
bug = find_bug(regs->nip);
if (bug == NULL)
return;
if (bug->line & BUG_WARNING_TRAP)
return;
printf("kernel BUG in %s at %s:%d!\n",
bug->function, bug->file, (unsigned int)bug->line);
}
void excprint(struct pt_regs *fp)
{
unsigned long trap;
#ifdef CONFIG_SMP
printf("cpu 0x%x: ", smp_processor_id());
#endif /* CONFIG_SMP */
trap = TRAP(fp);
printf("Vector: %lx %s at [%lx]\n", fp->trap, getvecname(trap), fp);
printf(" pc: ");
xmon_print_symbol(fp->nip, ": ", "\n");
printf(" lr: ", fp->link);
xmon_print_symbol(fp->link, ": ", "\n");
printf(" sp: %lx\n", fp->gpr[1]);
printf(" msr: %lx\n", fp->msr);
if (trap == 0x300 || trap == 0x380 || trap == 0x600) {
printf(" dar: %lx\n", fp->dar);
if (trap != 0x380)
printf(" dsisr: %lx\n", fp->dsisr);
}
printf(" current = 0x%lx\n", current);
#ifdef CONFIG_PPC64
printf(" paca = 0x%lx\n", get_paca());
#endif
if (current) {
printf(" pid = %ld, comm = %s\n",
current->pid, current->comm);
}
if (trap == 0x700)
print_bug_trap(fp);
}
void prregs(struct pt_regs *fp)
{
int n, trap;
unsigned long base;
struct pt_regs regs;
if (scanhex(&base)) {
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
regs = *(struct pt_regs *)base;
sync();
__delay(200);
} else {
catch_memory_errors = 0;
printf("*** Error reading registers from "REG"\n",
base);
return;
}
catch_memory_errors = 0;
fp = &regs;
}
#ifdef CONFIG_PPC64
if (FULL_REGS(fp)) {
for (n = 0; n < 16; ++n)
printf("R%.2ld = "REG" R%.2ld = "REG"\n",
n, fp->gpr[n], n+16, fp->gpr[n+16]);
} else {
for (n = 0; n < 7; ++n)
printf("R%.2ld = "REG" R%.2ld = "REG"\n",
n, fp->gpr[n], n+7, fp->gpr[n+7]);
}
#else
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;
}
}
#endif
printf("pc = ");
xmon_print_symbol(fp->nip, " ", "\n");
printf("lr = ");
xmon_print_symbol(fp->link, " ", "\n");
printf("msr = "REG" cr = %.8lx\n", fp->msr, fp->ccr);
printf("ctr = "REG" xer = "REG" trap = %4lx\n",
fp->ctr, fp->xer, fp->trap);
trap = TRAP(fp);
if (trap == 0x300 || trap == 0x380 || trap == 0x600)
printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr);
}
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 + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
if (cmd != 'i') {
for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
cflush((void *) adrs);
} else {
for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES)
cinval((void *) adrs);
}
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
}
catch_memory_errors = 0;
}
unsigned long
read_spr(int n)
{
unsigned int instrs[2];
unsigned long (*code)(void);
unsigned long opd[3];
unsigned long ret = -1UL;
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;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
ret = code();
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
n = size;
}
return ret;
}
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;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
code(val);
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
n = size;
}
}
static unsigned long regno;
extern char exc_prolog;
extern char dec_exc;
void super_regs(void)
{
int cmd;
unsigned long val;
#ifdef CONFIG_PPC_ISERIES
struct paca_struct *ptrPaca = NULL;
struct lppaca *ptrLpPaca = NULL;
struct ItLpRegSave *ptrLpRegSave = NULL;
#endif
cmd = skipbl();
if (cmd == '\n') {
unsigned long sp, toc;
asm("mr %0,1" : "=r" (sp) :);
asm("mr %0,2" : "=r" (toc) :);
printf("msr = "REG" sprg0= "REG"\n",
mfmsr(), mfspr(SPRN_SPRG0));
printf("pvr = "REG" sprg1= "REG"\n",
mfspr(SPRN_PVR), mfspr(SPRN_SPRG1));
printf("dec = "REG" sprg2= "REG"\n",
mfspr(SPRN_DEC), mfspr(SPRN_SPRG2));
printf("sp = "REG" sprg3= "REG"\n", sp, mfspr(SPRN_SPRG3));
printf("toc = "REG" dar = "REG"\n", toc, mfspr(SPRN_DAR));
#ifdef CONFIG_PPC_ISERIES
// Dump out relevant Paca data areas.
printf("Paca: \n");
ptrPaca = get_paca();
printf(" Local Processor Control Area (LpPaca): \n");
ptrLpPaca = ptrPaca->lppaca_ptr;
printf(" Saved Srr0=%.16lx Saved Srr1=%.16lx \n",
ptrLpPaca->saved_srr0, ptrLpPaca->saved_srr1);
printf(" Saved Gpr3=%.16lx Saved Gpr4=%.16lx \n",
ptrLpPaca->saved_gpr3, ptrLpPaca->saved_gpr4);
printf(" Saved Gpr5=%.16lx \n", ptrLpPaca->saved_gpr5);
printf(" Local Processor Register Save Area (LpRegSave): \n");
ptrLpRegSave = ptrPaca->reg_save_ptr;
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);
#endif
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;
}
scannl();
}
/*
* Stuff for reading and writing memory safely
*/
int
mread(unsigned long adrs, void *buf, int size)
{
volatile int n;
char *p, *q;
n = 0;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
p = (char *)adrs;
q = (char *)buf;
switch (size) {
case 2:
*(u16 *)q = *(u16 *)p;
break;
case 4:
*(u32 *)q = *(u32 *)p;
break;
case 8:
*(u64 *)q = *(u64 *)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;
}
catch_memory_errors = 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) {
catch_memory_errors = 1;
sync();
p = (char *) adrs;
q = (char *) buf;
switch (size) {
case 2:
*(u16 *)p = *(u16 *)q;
break;
case 4:
*(u32 *)p = *(u32 *)q;
break;
case 8:
*(u64 *)p = *(u64 *)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);
}
catch_memory_errors = 0;
return n;
}
static int fault_type;
static int fault_except;
static char *fault_chars[] = { "--", "**", "##" };
static int handle_fault(struct pt_regs *regs)
{
fault_except = TRAP(regs);
switch (TRAP(regs)) {
case 0x200:
fault_type = 0;
break;
case 0x300:
case 0x380:
fault_type = 1;
break;
default:
fault_type = 2;
}
longjmp(bus_error_jmp, 1);
return 0;
}
#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"
" l change to long (4 byte) mode\n"
" u change to doubleword (8 byte) mode\n"
" m addr change current addr\n"
" n toggle no-read flag\n"
" r toggle byte reverse flag\n"
" < count back up count bytes\n"
" > count skip forward count bytes\n"
" x exit this mode\n"
"";
void
memex(void)
{
int cmd, inc, i, nslash;
unsigned long n;
unsigned char val[16];
scanhex((void *)&adrs);
cmd = skipbl();
if (cmd == '?') {
printf(memex_help_string);
return;
} else {
termch = cmd;
}
last_cmd = "m\n";
while ((cmd = skipbl()) != '\n') {
switch( cmd ){
case 'b': size = 1; break;
case 'w': size = 2; break;
case 'l': size = 4; break;
case 'd': size = 8; break;
case 'r': brev = !brev; break;
case 'n': mnoread = 1; break;
case '.': mnoread = 0; break;
}
}
if( size <= 0 )
size = 1;
else if( size > 8 )
size = 8;
for(;;){
if (!mnoread)
n = mread(adrs, val, size);
printf("%.16x%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 'u':
size = 8;
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((void *)&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;
case '?':
printf(memex_subcmd_help_string);
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;
}
#define isxdigit(c) (('0' <= (c) && (c) <= '9') \
|| ('a' <= (c) && (c) <= 'f') \
|| ('A' <= (c) && (c) <= 'F'))
void
dump(void)
{
int c;
c = inchar();
if ((isxdigit(c) && c != 'f' && c != 'd') || c == '\n')
termch = c;
scanhex((void *)&adrs);
if (termch != '\n')
termch = 0;
if (c == 'i') {
scanhex(&nidump);
if (nidump == 0)
nidump = 16;
else if (nidump > MAX_DUMP)
nidump = MAX_DUMP;
adrs += ppc_inst_dump(adrs, nidump, 1);
last_cmd = "di\n";
} else {
scanhex(&ndump);
if (ndump == 0)
ndump = 64;
else if (ndump > MAX_DUMP)
ndump = MAX_DUMP;
prdump(adrs, ndump);
adrs += ndump;
last_cmd = "d\n";
}
}
void
prdump(unsigned long adrs, long ndump)
{
long n, m, c, r, nr;
unsigned char temp[16];
for (n = ndump; n > 0;) {
printf(REG, adrs);
putchar(' ');
r = n < 16? n: 16;
nr = mread(adrs, temp, r);
adrs += nr;
for (m = 0; m < r; ++m) {
if ((m & 7) == 0 && m > 0)
putchar(' ');
if (m < nr)
printf("%.2x", temp[m]);
else
printf("%s", fault_chars[fault_type]);
}
if (m <= 8)
printf(" ");
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 long adr, long count, int praddr)
{
int nr, dotted;
unsigned long 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) {
if (praddr) {
const char *x = fault_chars[fault_type];
printf(REG" %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;
if (praddr)
printf(REG" %.8x", adr, inst);
printf("\t");
print_insn_powerpc(inst, adr, 0); /* always returns 4 */
printf("\n");
}
return adr - first_adr;
}
void
print_address(unsigned long addr)
{
xmon_print_symbol(addr, "\t# ", "");
}
/*
* Memory operations - move, set, print differences
*/
static unsigned long mdest; /* destination address */
static unsigned long msrc; /* source address */
static unsigned long mval; /* byte value to set memory to */
static unsigned long mcount; /* # bytes to affect */
static unsigned long mdiffs; /* max # differences to print */
void
memops(int cmd)
{
scanhex((void *)&mdest);
if( termch != '\n' )
termch = 0;
scanhex((void *)(cmd == 's'? &mval: &msrc));
if( termch != '\n' )
termch = 0;
scanhex((void *)&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((void *)&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("%.16x %.2x # %.16x %.2x\n", p1 - 1,
p1[-1], 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((void *)&mdest);
if (termch != '\n') {
termch = 0;
scanhex((void *)&mend);
if (termch != '\n') {
termch = 0;
scanhex((void *)&mval);
mask = ~0;
if (termch != '\n') termch = 0;
scanhex((void *)&mask);
}
}
n = 0;
for (a = mdest; a < mend; a += 4) {
if (mread(a, val, 4) == 4
&& ((GETWORD(val) ^ mval) & mask) == 0) {
printf("%.16x: %.16x\n", a, GETWORD(val));
if (++n >= 10)
break;
}
}
}
static unsigned long mskip = 0x1000;
static unsigned long 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);
} 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 long args[8];
unsigned long ret;
int i;
typedef unsigned long (*callfunc_t)(unsigned long, unsigned long,
unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long, unsigned long);
callfunc_t func;
if (!scanhex(&adrs))
return;
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) {
catch_memory_errors = 1;
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);
}
catch_memory_errors = 0;
}
/* 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",
#ifdef CONFIG_PPC64
"softe",
#else
"mq",
#endif
"trap", "dar", "dsisr", "res"
};
int
scanhex(unsigned long *vp)
{
int c, d;
unsigned long 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) {
if (xmon_regs == NULL) {
printf("regs not available\n");
return 0;
}
*vp = ((unsigned long *)xmon_regs)[i];
return 1;
}
}
printf("invalid register name '%%%s'\n", regname);
return 0;
}
/* skip leading "0x" if any */
if (c == '0') {
c = inchar();
if (c == 'x') {
c = inchar();
} else {
d = hexdigit(c);
if (d == EOF) {
termch = c;
*vp = 0;
return 1;
}
}
} else if (c == '$') {
int i;
for (i=0; i<63; i++) {
c = inchar();
if (isspace(c)) {
termch = c;
break;
}
tmpstr[i] = c;
}
tmpstr[i++] = 0;
*vp = 0;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
*vp = kallsyms_lookup_name(tmpstr);
sync();
}
catch_memory_errors = 0;
if (!(*vp)) {
printf("unknown symbol '%s'\n", tmpstr);
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 (xmon_gets(line, sizeof(line)) == 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 long addr;
static char tmp[64];
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) {
catch_memory_errors = 1;
sync();
addr = kallsyms_lookup_name(tmp);
if (addr)
printf("%s: %lx\n", tmp, addr);
else
printf("Symbol '%s' not found.\n", tmp);
sync();
}
catch_memory_errors = 0;
termch = 0;
break;
}
}
/* 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;
printf(REG, address);
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
name = kallsyms_lookup(address, &size, &offset, &modname,
tmpstr);
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
}
catch_memory_errors = 0;
if (name) {
printf("%s%s+%#lx/%#lx", mid, name, offset, size);
if (modname)
printf(" [%s]", modname);
}
printf("%s", after);
}
#ifdef CONFIG_PPC64
static void dump_slb(void)
{
int i;
unsigned long tmp;
printf("SLB contents of cpu %x\n", smp_processor_id());
for (i = 0; i < SLB_NUM_ENTRIES; i++) {
asm volatile("slbmfee %0,%1" : "=r" (tmp) : "r" (i));
printf("%02d %016lx ", i, tmp);
asm volatile("slbmfev %0,%1" : "=r" (tmp) : "r" (i));
printf("%016lx\n", tmp);
}
}
static void dump_stab(void)
{
int i;
unsigned long *tmp = (unsigned long *)get_paca()->stab_addr;
printf("Segment table contents of cpu %x\n", smp_processor_id());
for (i = 0; i < PAGE_SIZE/16; i++) {
unsigned long a, b;
a = *tmp++;
b = *tmp++;
if (a || b) {
printf("%03d %016lx ", i, a);
printf("%016lx\n", b);
}
}
}
void dump_segments(void)
{
if (cpu_has_feature(CPU_FTR_SLB))
dump_slb();
else
dump_stab();
}
#endif
#ifdef CONFIG_PPC_STD_MMU_32
void dump_segments(void)
{
int i;
printf("sr0-15 =");
for (i = 0; i < 16; ++i)
printf(" %x", mfsrin(i));
printf("\n");
}
#endif
void xmon_init(int enable)
{
if (enable) {
__debugger = xmon;
__debugger_ipi = xmon_ipi;
__debugger_bpt = xmon_bpt;
__debugger_sstep = xmon_sstep;
__debugger_iabr_match = xmon_iabr_match;
__debugger_dabr_match = xmon_dabr_match;
__debugger_fault_handler = xmon_fault_handler;
} else {
__debugger = NULL;
__debugger_ipi = NULL;
__debugger_bpt = NULL;
__debugger_sstep = NULL;
__debugger_iabr_match = NULL;
__debugger_dabr_match = NULL;
__debugger_fault_handler = NULL;
}
xmon_map_scc();
}
#ifdef CONFIG_MAGIC_SYSRQ
static void sysrq_handle_xmon(int key, struct pt_regs *pt_regs,
struct tty_struct *tty)
{
/* ensure xmon is enabled */
xmon_init(1);
debugger(pt_regs);
}
static struct sysrq_key_op sysrq_xmon_op =
{
.handler = sysrq_handle_xmon,
.help_msg = "Xmon",
.action_msg = "Entering xmon",
};
static int __init setup_xmon_sysrq(void)
{
register_sysrq_key('x', &sysrq_xmon_op);
return 0;
}
__initcall(setup_xmon_sysrq);
#endif /* CONFIG_MAGIC_SYSRQ */
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