asmlinkage void do_reserved(struct pt_regs *regs)
{
/*
* Game over - no way to handle this if it ever occurs. Most probably
* caused by a new unknown cpu type or after another deadly
* hard/software error.
*/
die_if_kernel("do_reserved execution Exception", regs);
show_regs(regs);
panic("Caught reserved exception - should not happen.");
}
dotraplinkage void do_page_fault(struct pt_regs *regs, long error_code)
{
unsigned long address = read_cr2();
__do_page_fault(regs, error_code, address);
printk("BUG: unable to handle kernel paging request at %#lx\n", address);
printk("CPU: %d PID: %u Comm: %s\n", smp_processor_id(), current->pid, current->comm);
show_regs(regs);
panic("panic at #PF");
}
void ps2_be_board_handler(struct pt_regs *regs)
{
u_int sr, paddr;
sr = read_32bit_cp0_register(CP0_STATUS);
paddr = read_32bit_cp0_register($23); /* BadPAddr */
force_sig(SIGBUS, current);
show_regs(regs);
printk("paddr : %08x\n", paddr);
write_32bit_cp0_register(CP0_STATUS, sr & ~(1 << 12)); /* clear BM */
}
asmlinkage void double_fault_c(struct pt_regs *fp)
{
console_verbose();
oops_in_progress = 1;
printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
dump_bfin_process(fp);
dump_bfin_mem(fp);
show_regs(fp);
panic("Double Fault - unrecoverable event\n");
}
static void sysrq_handle_showallcpus(int key)
{
if (!trigger_all_cpu_backtrace()) {
struct pt_regs *regs = get_irq_regs();
if (regs) {
printk(KERN_INFO "CPU%d:\n", smp_processor_id());
show_regs(regs);
}
schedule_work(&sysrq_showallcpus);
}
}
void die(const char *str, struct pt_regs *fp, long err)
{
console_verbose();
spin_lock_irq(&die_lock);
printk(KERN_WARNING "Oops: %s, sig: %ld\n", str, err);
show_regs(fp);
spin_unlock_irq(&die_lock);
/* do_exit() should take care of panic'ing from an interrupt
* context so we don't handle it here
*/
do_exit(err);
}
/* we come to here via sys_nis_syscall so it can setup the regs argument */
asmlinkage unsigned long
c_sys_nis_syscall (struct pt_regs *regs)
{
static int count = 0;
if (count++ > 5) return -ENOSYS;
printk ("%s[%d]: Unimplemented SPARC system call %d\n", current->comm, current->pid, (int)regs->u_regs[1]);
#ifdef DEBUG_UNIMP_SYSCALL
show_regs (regs);
#endif
return -ENOSYS;
}
void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
unsigned long address)
{
current->thread.fault_address = address;
/* Caller and Callee regs */
show_regs(regs);
/* Show stack trace if this Fatality happened in kernel mode */
if (!user_mode(regs))
show_stacktrace(current, regs);
}
/* ======================================================================
* Interpreter command to dump the registers. Calls the CPU-specific
* show registers routine.
* ====================================================================== */
int do_bedbug_rdump (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
/* -------------------------------------------------- */
if (!bug_ctx.stopped) {
printf ("Not at a breakpoint\n");
return 1;
}
show_regs (bug_ctx.regs);
return 0;
} /* do_bedbug_rdump */
void
StackOverflow(struct pt_regs *regs)
{
printk(KERN_CRIT "Kernel stack overflow in process %p, r1=%lx\n",
current, regs->gpr[1]);
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
debugger(regs);
#endif
show_regs(regs);
print_backtrace((unsigned long *)regs->gpr[1]);
instruction_dump((unsigned long *)regs->nip);
panic("kernel stack overflow");
}
static int ip32_be_handler(struct pt_regs *regs, int is_fixup)
{
int data = regs->cp0_cause & 4;
if (is_fixup)
return MIPS_BE_FIXUP;
printk("Got %cbe at 0x%lx\n", data ? 'd' : 'i', regs->cp0_epc);
show_regs(regs);
dump_tlb_all();
while(1);
force_sig(SIGBUS, current);
}
void die_if_kernel(char *str, struct pt_regs *regs, long err)
{
if (user_mode(regs)) {
#ifdef PRINT_USER_FAULTS
if (err == 0)
return; /* STFU */
/* XXX for debugging only */
printk(KERN_DEBUG "%s (pid %d): %s (code %ld)\n",
current->comm, current->pid, str, err);
show_regs(regs);
#endif
return;
}
/* unlock the pdc lock if necessary */
pdc_emergency_unlock();
/* maybe the kernel hasn't booted very far yet and hasn't been able
* to initialize the serial or STI console. In that case we should
* re-enable the pdc console, so that the user will be able to
* identify the problem. */
if (!console_drivers)
pdc_console_restart();
printk(KERN_CRIT "%s (pid %d): %s (code %ld)\n",
current->comm, current->pid, str, err);
show_regs(regs);
/* Wot's wrong wif bein' racy? */
if (current->thread.flags & PARISC_KERNEL_DEATH) {
printk(KERN_CRIT "%s() recursion detected.\n", __FUNCTION__);
sti();
while (1);
}
current->thread.flags |= PARISC_KERNEL_DEATH;
do_exit(SIGSEGV);
}
int handle_watch_interrupt(struct pt_regs *regs, int fault)
{
/* Rewrite status register to clear set bits. */
unsigned long status = pmc_get_overflow();
pmc_ack_overflow(status);
printk("Hit watchpoint somewhat before the following:\n");
show_regs(regs);
__insn_mtspr(SPR_PERF_COUNT_0, -1);
return 0;
}
/* Callback function for perf event subsystem */
static void watchdog_overflow_callback(struct perf_event *event,
struct perf_sample_data *data,
struct pt_regs *regs)
{
/* Ensure the watchdog never gets throttled */
event->hw.interrupts = 0;
if (__this_cpu_read(watchdog_nmi_touch) == true) {
__this_cpu_write(watchdog_nmi_touch, false);
return;
}
/* check for a hardlockup
* This is done by making sure our timer interrupt
* is incrementing. The timer interrupt should have
* fired multiple times before we overflow'd. If it hasn't
* then this is a good indication the cpu is stuck
*/
if (is_hardlockup()) {
int this_cpu = smp_processor_id();
/* only print hardlockups once */
if (__this_cpu_read(hard_watchdog_warn) == true)
return;
pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
print_modules();
print_irqtrace_events(current);
if (regs)
show_regs(regs);
else
dump_stack();
/*
* Perform all-CPU dump only once to avoid multiple hardlockups
* generating interleaving traces
*/
if (sysctl_hardlockup_all_cpu_backtrace &&
!test_and_set_bit(0, &hardlockup_allcpu_dumped))
trigger_allbutself_cpu_backtrace();
if (hardlockup_panic)
nmi_panic(regs, "Hard LOCKUP");
__this_cpu_write(hard_watchdog_warn, true);
return;
}
__this_cpu_write(hard_watchdog_warn, false);
return;
}
void handle_break(unsigned iir, struct pt_regs *regs)
{
struct siginfo si;
switch(iir) {
case 0x00:
#ifdef PRINT_USER_FAULTS
printk(KERN_DEBUG "break 0,0: pid=%d command='%s'\n",
current->pid, current->comm);
#endif
die_if_kernel("Breakpoint", regs, 0);
#ifdef PRINT_USER_FAULTS
show_regs(regs);
#endif
si.si_code = TRAP_BRKPT;
si.si_addr = (void *) (regs->iaoq[0] & ~3);
si.si_signo = SIGTRAP;
force_sig_info(SIGTRAP, &si, current);
break;
case GDB_BREAK_INSN:
die_if_kernel("Breakpoint", regs, 0);
handle_gdb_break(regs, TRAP_BRKPT);
break;
default:
#ifdef PRINT_USER_FAULTS
printk(KERN_DEBUG "break %#08x: pid=%d command='%s'\n",
iir, current->pid, current->comm);
show_regs(regs);
#endif
si.si_signo = SIGTRAP;
si.si_code = TRAP_BRKPT;
si.si_addr = (void *) (regs->iaoq[0] & ~3);
force_sig_info(SIGTRAP, &si, current);
return;
}
}
void
_exception(int signr, struct pt_regs *regs)
{
if (!user_mode(regs))
{
show_regs(regs);
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
debugger(regs);
#endif
print_backtrace((unsigned long *)regs->gpr[1]);
panic("Exception in kernel pc %lx signal %d",regs->nip,signr);
}
force_sig(signr, current);
}
asmlinkage int sunos_nosys(void)
{
struct pt_regs *regs;
regs = (struct pt_regs *) (current->saved_kernel_stack +
sizeof(struct reg_window));
current->tss.sig_address = regs->pc;
current->tss.sig_desc = regs->u_regs[UREG_G1];
send_sig(SIGSYS, current, 1);
printk("Process makes ni_syscall number %d, register dump:\n",
(int) regs->u_regs[UREG_G1]);
show_regs(regs);
return -ENOSYS;
}
static inline void report_user_fault(struct pt_regs *regs, int signr)
{
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
return;
if (!unhandled_signal(current, signr))
return;
if (!printk_ratelimit())
return;
printk("User process fault: interruption code %04x ilc:%d ",
regs->int_code & 0xffff, regs->int_code >> 17);
print_vma_addr("in ", regs->psw.addr & PSW_ADDR_INSN);
printk("\n");
show_regs(regs);
}
void die(char *str, struct pt_regs *fp, int nr)
{
console_verbose();
pr_err("%s: %08x\n", str, nr);
show_regs(fp);
pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
current->comm, current->pid, (PAGE_SIZE +
(unsigned long) current));
dump_stack();
while (1)
;
}
/* Unhandled exception handler */
asmlinkage void unhandled_exception(struct pt_regs *regs, int cause)
{
unsigned long addr = RDCTL(CTL_BADADDR);
cause /= 4;
pr_emerg("Unhandled exception #%d in %s mode (badaddr=0x%08lx)\n",
cause, user_mode(regs) ? "user" : "kernel", addr);
regs->ea -= 4;
show_regs(regs);
pr_emerg("opcode: 0x%08lx\n", *(unsigned long *)(regs->ea));
}
static inline void report_user_fault(struct pt_regs *regs, long int_code,
int signr, unsigned long address)
{
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
return;
if (!unhandled_signal(current, signr))
return;
if (!printk_ratelimit())
return;
printk("User process fault: interruption code 0x%lX ", int_code);
print_vma_addr(KERN_CONT "in ", regs->psw.addr & PSW_ADDR_INSN);
printk("\n");
printk("failing address: %lX\n", address);
show_regs(regs);
}
void die_if_kernel(char *str, struct pt_regs *pregs)
{
unsigned long pc;
pc = pregs->pc;
puts("");
outhex32(pc);
puts(" trapped to die_if_kernel");
show_regs(pregs);
#if 0
if(pregs->psr & PSR_SUPERVISOR)
do_exit(SIGKILL);
do_exit(SIGSEGV);
#endif
}
int __die(const char *str, struct pt_regs *regs, long err)
{
#ifdef CONFIG_X86_32
unsigned short ss;
unsigned long sp;
#endif
printk(KERN_DEFAULT
"%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
printk("PREEMPT ");
#endif
#ifdef CONFIG_SMP
printk("SMP ");
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
printk("DEBUG_PAGEALLOC ");
#endif
#ifdef CONFIG_KASAN
printk("KASAN");
#endif
printk("\n");
if (notify_die(DIE_OOPS, str, regs, err,
current->thread.trap_nr, SIGSEGV) == NOTIFY_STOP)
return 1;
/* FIXME this should probably also need to print into buffer */
print_modules();
show_regs(regs);
#ifdef CONFIG_X86_32
if (user_mode(regs)) {
sp = regs->sp;
ss = regs->ss & 0xffff;
} else {
sp = kernel_stack_pointer(regs);
savesegment(ss, ss);
}
printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
print_symbol("%s", regs->ip);
printk(" SS:ESP %04x:%08lx\n", ss, sp);
#else
/* Executive summary in case the oops scrolled away */
printk(KERN_ALERT "RIP ");
/* FIXME */
printk_address(regs->ip);
printk(" RSP <%016lx>\n", regs->sp);
#endif
return 0;
}
void sun4m_nmi(struct pt_regs *regs)
{
unsigned long afsr, afar;
printk("Aieee: sun4m NMI received!\n");
/* XXX HyperSparc hack XXX */
__asm__ __volatile__("mov 0x500, %%g1\n\t"
"lda [%%g1] 0x4, %0\n\t"
"mov 0x600, %%g1\n\t"
"lda [%%g1] 0x4, %1\n\t" :
"=r" (afsr), "=r" (afar));
printk("afsr=%08lx afar=%08lx\n", afsr, afar);
printk("you lose buddy boy...\n");
show_regs(regs);
prom_halt();
}
void report_user_fault(struct pt_regs *regs, long signr, int is_mm_fault)
{
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
return;
if (!unhandled_signal(current, signr))
return;
if (!printk_ratelimit())
return;
printk(KERN_ALERT "User process fault: interruption code %04x ilc:%d ",
regs->int_code & 0xffff, regs->int_code >> 17);
print_vma_addr(KERN_CONT "in ", regs->psw.addr);
printk(KERN_CONT "\n");
if (is_mm_fault)
dump_fault_info(regs);
show_regs(regs);
}
static void pa7300lc_lpmc(int code, struct pt_regs *regs)
{
u32 hpa;
printk(KERN_WARNING "LPMC on CPU %d\n", smp_processor_id());
show_regs(regs);
hpa = cpu_hpa();
printk(KERN_WARNING
"MIOC_CONTROL %08x\n" "MIOC_STATUS %08x\n"
"MDERRADD %08x\n" "DMAERR %08x\n"
"DIOERR %08x\n" "HIDMAMEM %08x\n",
gsc_readl(hpa+MIOC_CONTROL), gsc_readl(hpa+MIOC_STATUS),
gsc_readl(hpa+MDERRADD), gsc_readl(hpa+DMAERR),
gsc_readl(hpa+DIOERR), gsc_readl(hpa+HIDMAMEM));
}
static inline void report_user_fault(struct pt_regs *regs, long signr)
{
if ((task_pid_nr(current) > 1) && !show_unhandled_signals)
return;
if (!unhandled_signal(current, signr))
return;
if (!printk_ratelimit())
return;
printk(KERN_ALERT "User process fault: interruption code 0x%X ",
regs->int_code);
print_vma_addr(KERN_CONT "in ", regs->psw.addr & PSW_ADDR_INSN);
printk(KERN_CONT "\n");
printk(KERN_ALERT "failing address: %lX\n",
regs->int_parm_long & __FAIL_ADDR_MASK);
show_regs(regs);
}
void
MachineCheckException(struct pt_regs *regs)
{
if ( !user_mode(regs) )
{
#ifdef CONFIG_MBX
/* the mbx pci read routines can cause machine checks -- Cort */
bad_page_fault(regs,regs->dar);
return;
#endif /* CONFIG_MBX */
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
if (debugger_fault_handler) {
debugger_fault_handler(regs);
return;
}
#endif
printk("Machine check in kernel mode.\n");
printk("Caused by (from msr): ");
printk("regs %p ",regs);
switch( regs->msr & 0x0000F000)
{
case (1<<12) :
printk("Machine check signal - probably due to mm fault\n"
"with mmu off\n");
break;
case (1<<13) :
printk("Transfer error ack signal\n");
break;
case (1<<14) :
printk("Data parity signal\n");
break;
case (1<<15) :
printk("Address parity signal\n");
break;
default:
printk("Unknown values in msr\n");
}
show_regs(regs);
#if defined(CONFIG_XMON) || defined(CONFIG_KGDB)
debugger(regs);
#endif
print_backtrace((unsigned long *)regs->gpr[1]);
instruction_dump((unsigned long *)regs->nip);
panic("machine check");
}
_exception(SIGSEGV, regs);
}
void trace_unhandled_signal(const char *type, struct pt_regs *regs,
unsigned long address, int sig)
{
struct task_struct *tsk = current;
if (show_unhandled_signals == 0)
return;
/* If the signal is handled, don't show it here. */
if (!is_global_init(tsk)) {
void __user *handler =
tsk->sighand->action[sig-1].sa.sa_handler;
if (handler != SIG_IGN && handler != SIG_DFL)
return;
}
/* Rate-limit the one-line output, not the detailed output. */
if (show_unhandled_signals <= 1 && !printk_ratelimit())
return;
printk("%s%s[%d]: %s at %lx pc "REGFMT" signal %d",
task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
tsk->comm, task_pid_nr(tsk), type, address, regs->pc, sig);
print_vma_addr(KERN_CONT " in ", regs->pc);
printk(KERN_CONT "\n");
if (show_unhandled_signals > 1) {
switch (sig) {
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
pr_err("User crash: signal %d,"
" trap %ld, address 0x%lx\n",
sig, regs->faultnum, address);
show_regs(regs);
dump_mem((void __user *)address);
break;
default:
pr_err("User crash: signal %d, trap %ld\n",
sig, regs->faultnum);
break;
}
}
}
static void sysrq_handle_showallcpus(int key)
{
/*
* Fall back to the workqueue based printing if the
* backtrace printing did not succeed or the
* architecture has no support for it:
*/
if (!trigger_all_cpu_backtrace()) {
struct pt_regs *regs = get_irq_regs();
if (regs) {
printk(KERN_INFO "CPU%d:\n", smp_processor_id());
show_regs(regs);
}
schedule_work(&sysrq_showallcpus);
}
}