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xmon.c
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/*
* Routines providing a simple monitor for use on the PowerMac.
*
* Copyright (C) 1996-2005 Paul Mackerras.
* Copyright (C) 2001 PPC64 Team, IBM Corp
* Copyrignt (C) 2006 Michael Ellerman, IBM Corp
*
* 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/kernel.h>
#include <linux/errno.h>
#include <linux/sched/signal.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/kallsyms.h>
#include <linux/kmsg_dump.h>
#include <linux/cpumask.h>
#include <linux/export.h>
#include <linux/sysrq.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/bug.h>
#include <linux/nmi.h>
#include <linux/ctype.h>
#include <linux/highmem.h>
#include <asm/debugfs.h>
#include <asm/ptrace.h>
#include <asm/smp.h>
#include <asm/string.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/xmon.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/mmu.h>
#include <asm/mmu_context.h>
#include <asm/plpar_wrappers.h>
#include <asm/cputable.h>
#include <asm/rtas.h>
#include <asm/sstep.h>
#include <asm/irq_regs.h>
#include <asm/spu.h>
#include <asm/spu_priv1.h>
#include <asm/setjmp.h>
#include <asm/reg.h>
#include <asm/debug.h>
#include <asm/hw_breakpoint.h>
#include <asm/xive.h>
#include <asm/opal.h>
#include <asm/firmware.h>
#include <asm/code-patching.h>
#include <asm/sections.h>
#ifdef CONFIG_PPC64
#include <asm/hvcall.h>
#include <asm/paca.h>
#endif
#include "nonstdio.h"
#include "dis-asm.h"
#ifdef CONFIG_SMP
static cpumask_t cpus_in_xmon = CPU_MASK_NONE;
static unsigned long xmon_taken = 1;
static int xmon_owner;
static int xmon_gate;
#else
#define xmon_owner 0
#endif /* CONFIG_SMP */
#ifdef CONFIG_PPC_PSERIES
static int set_indicator_token = RTAS_UNKNOWN_SERVICE;
#endif
static unsigned long in_xmon __read_mostly = 0;
static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT);
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];
static int tracing_enabled;
static long bus_error_jmp[JMP_BUF_LEN];
static int catch_memory_errors;
static int catch_spr_faults;
static long *xmon_fault_jmp[NR_CPUS];
/* 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_CIABR 1
#define BP_TRAP 2
#define BP_DABR 4
#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 show_pte(unsigned long);
static void prdump(unsigned long, long);
static int ppc_inst_dump(unsigned long, long, int);
static void dump_log_buf(void);
#ifdef CONFIG_PPC_POWERNV
static void dump_opal_msglog(void);
#else
static inline void dump_opal_msglog(void)
{
printf("Machine is not running OPAL firmware.\n");
}
#endif
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 int read_spr(int, unsigned long *);
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);
static void show_tasks(void);
void dump_segments(void);
static void symbol_lookup(void);
static void xmon_show_stack(unsigned long sp, unsigned long lr,
unsigned long pc);
static void xmon_print_symbol(unsigned long address, const char *mid,
const char *after);
static const char *getvecname(unsigned long vec);
static int do_spu_cmd(void);
#ifdef CONFIG_44x
static void dump_tlb_44x(void);
#endif
#ifdef CONFIG_PPC_BOOK3E
static void dump_tlb_book3e(void);
#endif
#ifdef CONFIG_PPC64
#define REG "%.16lx"
#else
#define REG "%.8lx"
#endif
#ifdef __LITTLE_ENDIAN__
#define GETWORD(v) (((v)[3] << 24) + ((v)[2] << 16) + ((v)[1] << 8) + (v)[0])
#else
#define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3])
#endif
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\
d1 dump 1 byte values\n\
d2 dump 2 byte values\n\
d4 dump 4 byte values\n\
d8 dump 8 byte values\n\
di dump instructions\n\
df dump float values\n\
dd dump double values\n\
dl dump the kernel log buffer\n"
#ifdef CONFIG_PPC_POWERNV
"\
do dump the OPAL message log\n"
#endif
#ifdef CONFIG_PPC64
"\
dp[#] dump paca for current cpu, or cpu #\n\
dpa dump paca for all possible cpus\n"
#endif
"\
dr dump stream of raw bytes\n\
dv dump virtual address translation \n\
dt dump the tracing buffers (uses printk)\n\
dtc dump the tracing buffers for current CPU (uses printk)\n\
"
#ifdef CONFIG_PPC_POWERNV
" dx# dump xive on CPU #\n\
dxi# dump xive irq state #\n\
dxa dump xive on all CPUs\n"
#endif
" e print exception information\n\
f flush cache\n\
la lookup symbol+offset of specified address\n\
ls lookup address of specified symbol\n\
lp s [#] lookup address of percpu symbol s for current cpu, or cpu #\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\
P list processes/tasks\n\
r print registers\n\
s single step\n"
#ifdef CONFIG_SPU_BASE
" ss stop execution on all spus\n\
sr restore execution on stopped spus\n\
sf # dump spu fields for spu # (in hex)\n\
sd # dump spu local store for spu # (in hex)\n\
sdi # disassemble spu local store for spu # (in hex)\n"
#endif
" S print special registers\n\
Sa print all SPRs\n\
Sr # read SPR #\n\
Sw #v write v to SPR #\n\
t print backtrace\n\
x exit monitor and recover\n\
X exit monitor and don't recover\n"
#if defined(CONFIG_PPC64) && !defined(CONFIG_PPC_BOOK3E)
" u dump segment table or SLB\n"
#elif defined(CONFIG_PPC_BOOK3S_32)
" u dump segment registers\n"
#elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E)
" u dump TLB\n"
#endif
" U show uptime information\n"
" ? help\n"
" # n limit output to n lines per page (for dp, dpa, dl)\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));
}
/**
* write_ciabr() - write the CIABR SPR
* @ciabr: The value to write.
*
* This function writes a value to the CIARB register either directly
* through mtspr instruction if the kernel is in HV privilege mode or
* call a hypervisor function to achieve the same in case the kernel
* is in supervisor privilege mode.
*/
static void write_ciabr(unsigned long ciabr)
{
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return;
if (cpu_has_feature(CPU_FTR_HVMODE)) {
mtspr(SPRN_CIABR, ciabr);
return;
}
plpar_set_ciabr(ciabr);
}
/**
* set_ciabr() - set the CIABR
* @addr: The value to set.
*
* This function sets the correct privilege value into the the HW
* breakpoint address before writing it up in the CIABR register.
*/
static void set_ciabr(unsigned long addr)
{
addr &= ~CIABR_PRIV;
if (cpu_has_feature(CPU_FTR_HVMODE))
addr |= CIABR_PRIV_HYPER;
else
addr |= CIABR_PRIV_SUPER;
write_ciabr(addr);
}
/*
* 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.
*/
if (set_indicator_token == RTAS_UNKNOWN_SERVICE)
return;
rtas_call_unlocked(&args, set_indicator_token, 3, 1, NULL,
SURVEILLANCE_TOKEN, 0, 0);
#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 (;;) {
last_speaker = cmpxchg(&xmon_speaker, 0, me);
if (last_speaker == 0)
return;
/*
* Wait a full second for the lock, we might be on a slow
* console, but check every 100us.
*/
timeout = 10000;
while (xmon_speaker == last_speaker) {
if (--timeout > 0) {
udelay(100);
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;
}
int cpus_are_in_xmon(void)
{
return !cpumask_empty(&cpus_in_xmon);
}
static bool wait_for_other_cpus(int ncpus)
{
unsigned long timeout;
/* We wait for 2s, which is a metric "little while" */
for (timeout = 20000; timeout != 0; --timeout) {
if (cpumask_weight(&cpus_in_xmon) >= ncpus)
return true;
udelay(100);
barrier();
}
return false;
}
#endif /* CONFIG_SMP */
static inline int unrecoverable_excp(struct pt_regs *regs)
{
#if defined(CONFIG_4xx) || defined(CONFIG_PPC_BOOK3E)
/* We have no MSR_RI bit on 4xx or Book3e, so we simply return false */
return 0;
#else
return ((regs->msr & MSR_RI) == 0);
#endif
}
static int xmon_core(struct pt_regs *regs, int fromipi)
{
int cmd = 0;
struct bpt *bp;
long recurse_jmp[JMP_BUF_LEN];
unsigned long offset;
unsigned long flags;
#ifdef CONFIG_SMP
int cpu;
int secondary;
#endif
local_irq_save(flags);
hard_irq_disable();
tracing_enabled = tracing_is_on();
tracing_off();
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 (cpumask_test_cpu(cpu, &cpus_in_xmon)) {
/*
* We catch SPR read/write faults here because the 0x700, 0xf60
* etc. handlers don't call debugger_fault_handler().
*/
if (catch_spr_faults)
longjmp(bus_error_jmp, 1);
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;
bp = NULL;
if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT))
bp = at_breakpoint(regs->nip);
if (bp || unrecoverable_excp(regs))
fromipi = 0;
if (!fromipi) {
get_output_lock();
excprint(regs);
if (bp) {
printf("cpu 0x%x stopped at breakpoint 0x%tx (",
cpu, BP_NUM(bp));
xmon_print_symbol(regs->nip, " ", ")\n");
}
if (unrecoverable_excp(regs))
printf("WARNING: exception is not recoverable, "
"can't continue\n");
release_output_lock();
}
cpumask_set_cpu(cpu, &cpus_in_xmon);
waiting:
secondary = 1;
spin_begin();
while (secondary && !xmon_gate) {
if (in_xmon == 0) {
if (fromipi) {
spin_end();
goto leave;
}
secondary = test_and_set_bit(0, &in_xmon);
}
spin_cpu_relax();
touch_nmi_watchdog();
}
spin_end();
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) {
/*
* A system reset (trap == 0x100) can be triggered on
* all CPUs, so when we come in via 0x100 try waiting
* for the other CPUs to come in before we send the
* debugger break (IPI). This is similar to
* crash_kexec_secondary().
*/
if (TRAP(regs) != 0x100 || !wait_for_other_cpus(ncpus))
smp_send_debugger_break();
wait_for_other_cpus(ncpus);
}
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();
touch_nmi_watchdog();
}
cmdloop:
while (in_xmon) {
if (secondary) {
spin_begin();
if (cpu == xmon_owner) {
if (!test_and_set_bit(0, &xmon_taken)) {
secondary = 0;
spin_end();
continue;
}
/* missed it */
while (cpu == xmon_owner)
spin_cpu_relax();
}
spin_cpu_relax();
touch_nmi_watchdog();
} 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:
cpumask_clear_cpu(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 %tx (", BP_NUM(bp));
xmon_print_symbol(regs->nip, " ", ")\n");
}
if (unrecoverable_excp(regs))
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
#ifdef CONFIG_BOOKE
if (regs->msr & MSR_DE) {
bp = at_breakpoint(regs->nip);
if (bp != NULL) {
regs->nip = (unsigned long) &bp->instr[0];
atomic_inc(&bp->ref_count);
}
}
#else
if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) {
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"));
}
}
}
#endif
insert_cpu_bpts();
touch_nmi_watchdog();
local_irq_restore(flags);
return cmd != 'X' && cmd != EOF;
}
int xmon(struct pt_regs *excp)
{
struct pt_regs regs;
if (excp == NULL) {
ppc_save_regs(®s);
excp = ®s;
}
return xmon_core(excp, 0);
}
EXPORT_SYMBOL(xmon);
irqreturn_t xmon_irq(int irq, void *d)
{
unsigned long flags;
local_irq_save(flags);
printf("Keyboard interrupt\n");
xmon(get_irq_regs());
local_irq_restore(flags);
return IRQ_HANDLED;
}
static int xmon_bpt(struct pt_regs *regs)
{
struct bpt *bp;
unsigned long offset;
if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
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;
}
static int xmon_sstep(struct pt_regs *regs)
{
if (user_mode(regs))
return 0;
xmon_core(regs, 0);
return 1;
}
static int xmon_break_match(struct pt_regs *regs)
{
if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
return 0;
if (dabr.enabled == 0)
return 0;
xmon_core(regs, 0);
return 1;
}
static int xmon_iabr_match(struct pt_regs *regs)
{
if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT))
return 0;
if (iabr == NULL)
return 0;
xmon_core(regs, 0);
return 1;
}
static int xmon_ipi(struct pt_regs *regs)
{
#ifdef CONFIG_SMP
if (in_xmon && !cpumask_test_cpu(smp_processor_id(), &cpus_in_xmon))
xmon_core(regs, 1);
#endif
return 0;
}
static 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_64BIT)) == (MSR_IR|MSR_64BIT)) {
bp = in_breakpoint_table(regs->nip, &offset);
if (bp != NULL) {
regs->nip = bp->address + offset;
atomic_dec(&bp->ref_count);
}
}
return 0;
}
/* Force enable xmon if not already enabled */
static inline void force_enable_xmon(void)
{
/* Enable xmon hooks if needed */
if (!xmon_on) {
printf("xmon: Enabling debugger hooks\n");
xmon_on = 1;
}
}
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_CIABR)) == 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_CIABR)
continue;
if (patch_instruction((unsigned int *)bp->address,
bpinstr) != 0) {
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)
{
struct arch_hw_breakpoint brk;
if (dabr.enabled) {
brk.address = dabr.address;
brk.type = (dabr.enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL;
brk.len = 8;
__set_breakpoint(&brk);
}
if (iabr)
set_ciabr(iabr->address);
}
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_CIABR)) != BP_TRAP)
continue;
if (mread(bp->address, &instr, 4) == 4
&& instr == bpinstr
&& patch_instruction(
(unsigned int *)bp->address, bp->instr[0]) != 0)
printf("Couldn't remove breakpoint at %lx\n",
bp->address);
else
store_inst((void *)bp->address);
}
}
static void remove_cpu_bpts(void)
{
hw_breakpoint_disable();
write_ciabr(0);
}
/* Based on uptime_proc_show(). */
static void
show_uptime(void)
{
struct timespec64 uptime;
if (setjmp(bus_error_jmp) == 0) {
catch_memory_errors = 1;
sync();
ktime_get_coarse_boottime_ts64(&uptime);
printf("Uptime: %lu.%.2lu seconds\n", (unsigned long)uptime.tv_sec,
((unsigned long)uptime.tv_nsec / (NSEC_PER_SEC/100)));
sync();
__delay(200); \
}
catch_memory_errors = 0;
}
static void set_lpp_cmd(void)
{
unsigned long lpp;
if (!scanhex(&lpp)) {
printf("Invalid number.\n");
lpp = 0;
}
xmon_set_pagination_lpp(lpp);
}
/* Command interpreting routine */
static char *last_cmd;
static int
cmds(struct pt_regs *excp)
{
int cmd = 0;
last_cmd = NULL;
xmon_regs = excp;
xmon_show_stack(excp->gpr[1], excp->link, excp->nip);
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(0, NULL);
break;
default:
termch = cmd;
memex();
}