*
* Pentium III FXSR, SSE support
* Gareth Hughes <gareth@valinux.com>, May 2000
- *
- * $Id: traps.c,v 1.36 2002/03/24 11:09:10 ak Exp $
*/
/*
* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'entry.S'.
*/
-#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/nmi.h>
+#include <linux/kprobes.h>
+#include <linux/kexec.h>
+#include <linux/unwind.h>
+#include <linux/uaccess.h>
+#include <linux/bug.h>
#include <asm/system.h>
-#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/debugreg.h>
#include <asm/i387.h>
#include <asm/kdebug.h>
#include <asm/processor.h>
-
+#include <asm/unwind.h>
#include <asm/smp.h>
#include <asm/pgalloc.h>
#include <asm/pda.h>
#include <asm/proto.h>
-
-#include <linux/irq.h>
-
-extern struct gate_struct idt_table[256];
+#include <asm/nmi.h>
+#include <asm/stacktrace.h>
asmlinkage void divide_error(void);
asmlinkage void debug(void);
asmlinkage void alignment_check(void);
asmlinkage void machine_check(void);
asmlinkage void spurious_interrupt_bug(void);
-asmlinkage void call_debug(void);
-struct notifier_block *die_chain;
+ATOMIC_NOTIFIER_HEAD(die_chain);
+EXPORT_SYMBOL(die_chain);
+
+extern char last_sysfs_file[];
+
+int register_die_notifier(struct notifier_block *nb)
+{
+ vmalloc_sync_all();
+ return atomic_notifier_chain_register(&die_chain, nb);
+}
+EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */
+
+int unregister_die_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&die_chain, nb);
+}
+EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */
static inline void conditional_sti(struct pt_regs *regs)
{
local_irq_enable();
}
-static int kstack_depth_to_print = 10;
+static inline void preempt_conditional_sti(struct pt_regs *regs)
+{
+ preempt_disable();
+ if (regs->eflags & X86_EFLAGS_IF)
+ local_irq_enable();
+}
+
+static inline void preempt_conditional_cli(struct pt_regs *regs)
+{
+ if (regs->eflags & X86_EFLAGS_IF)
+ local_irq_disable();
+ /* Make sure to not schedule here because we could be running
+ on an exception stack. */
+ preempt_enable_no_resched();
+}
+
+int kstack_depth_to_print = 12;
#ifdef CONFIG_KALLSYMS
-#include <linux/kallsyms.h>
-int printk_address(unsigned long address)
-{
+void printk_address(unsigned long address)
+{
unsigned long offset = 0, symsize;
const char *symname;
char *modname;
- char *delim = ":";
+ char *delim = ":";
char namebuf[128];
- symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
- if (!symname)
- return printk("[<%016lx>]", address);
- if (!modname)
+ symname = kallsyms_lookup(address, &symsize, &offset,
+ &modname, namebuf);
+ if (!symname) {
+ printk(" [<%016lx>]\n", address);
+ return;
+ }
+ if (!modname)
modname = delim = "";
- return printk("<%016lx>{%s%s%s%s%+ld}",
- address,delim,modname,delim,symname,offset);
-}
+ printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n",
+ address, delim, modname, delim, symname, offset, symsize);
+}
#else
-int printk_address(unsigned long address)
-{
- return printk("[<%016lx>]", address);
-}
+void printk_address(unsigned long address)
+{
+ printk(" [<%016lx>]\n", address);
+}
#endif
-unsigned long *in_exception_stack(int cpu, unsigned long stack)
-{
- int k;
+static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
+ unsigned *usedp, char **idp)
+{
+ static char ids[][8] = {
+ [DEBUG_STACK - 1] = "#DB",
+ [NMI_STACK - 1] = "NMI",
+ [DOUBLEFAULT_STACK - 1] = "#DF",
+ [STACKFAULT_STACK - 1] = "#SS",
+ [MCE_STACK - 1] = "#MC",
+#if DEBUG_STKSZ > EXCEPTION_STKSZ
+ [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
+#endif
+ };
+ unsigned k;
+
+ /*
+ * Iterate over all exception stacks, and figure out whether
+ * 'stack' is in one of them:
+ */
for (k = 0; k < N_EXCEPTION_STACKS; k++) {
- unsigned long end = init_tss[cpu].ist[k] + EXCEPTION_STKSZ;
+ unsigned long end = per_cpu(orig_ist, cpu).ist[k];
+ /*
+ * Is 'stack' above this exception frame's end?
+ * If yes then skip to the next frame.
+ */
+ if (stack >= end)
+ continue;
+ /*
+ * Is 'stack' above this exception frame's start address?
+ * If yes then we found the right frame.
+ */
+ if (stack >= end - EXCEPTION_STKSZ) {
+ /*
+ * Make sure we only iterate through an exception
+ * stack once. If it comes up for the second time
+ * then there's something wrong going on - just
+ * break out and return NULL:
+ */
+ if (*usedp & (1U << k))
+ break;
+ *usedp |= 1U << k;
+ *idp = ids[k];
+ return (unsigned long *)end;
+ }
+ /*
+ * If this is a debug stack, and if it has a larger size than
+ * the usual exception stacks, then 'stack' might still
+ * be within the lower portion of the debug stack:
+ */
+#if DEBUG_STKSZ > EXCEPTION_STKSZ
+ if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
+ unsigned j = N_EXCEPTION_STACKS - 1;
- if (stack >= init_tss[cpu].ist[k] && stack <= end)
+ /*
+ * Black magic. A large debug stack is composed of
+ * multiple exception stack entries, which we
+ * iterate through now. Dont look:
+ */
+ do {
+ ++j;
+ end -= EXCEPTION_STKSZ;
+ ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
+ } while (stack < end - EXCEPTION_STKSZ);
+ if (*usedp & (1U << j))
+ break;
+ *usedp |= 1U << j;
+ *idp = ids[j];
return (unsigned long *)end;
+ }
+#endif
}
- return 0;
-}
+ return NULL;
+}
+
+#define MSG(txt) ops->warning(data, txt)
/*
* x86-64 can have upto three kernel stacks:
* process stack
* interrupt stack
- * severe exception (double fault, nmi, stack fault) hardware stack
- * Check and process them in order.
+ * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
*/
-void show_trace(unsigned long *stack)
+static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
{
- unsigned long addr;
- unsigned long *irqstack, *irqstack_end, *estack_end;
- const int cpu = safe_smp_processor_id();
- int i;
+ void *t = (void *)tinfo;
+ return p > t && p < t + THREAD_SIZE - 3;
+}
- printk("\nCall Trace:");
- i = 0;
-
- estack_end = in_exception_stack(cpu, (unsigned long)stack);
- if (estack_end) {
- while (stack < estack_end) {
- addr = *stack++;
- if (kernel_text_address(addr)) {
- i += printk_address(addr);
- i += printk(" ");
- if (i > 50) {
- printk("\n");
- i = 0;
- }
- }
- }
- i += printk(" <EOE> ");
- i += 7;
- stack = (unsigned long *) estack_end[-2];
- }
-
- irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);
- irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE + 64);
-
- if (stack >= irqstack && stack < irqstack_end) {
- printk("<IRQ> ");
- while (stack < irqstack_end) {
- addr = *stack++;
+void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
+ unsigned long *stack,
+ struct stacktrace_ops *ops, void *data)
+{
+ const unsigned cpu = get_cpu();
+ unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr;
+ unsigned used = 0;
+ struct thread_info *tinfo;
+
+ if (!tsk)
+ tsk = current;
+
+ if (!stack) {
+ unsigned long dummy;
+ stack = &dummy;
+ if (tsk && tsk != current)
+ stack = (unsigned long *)tsk->thread.rsp;
+ }
+
+ /*
+ * Print function call entries within a stack. 'cond' is the
+ * "end of stackframe" condition, that the 'stack++'
+ * iteration will eventually trigger.
+ */
+#define HANDLE_STACK(cond) \
+ do while (cond) { \
+ unsigned long addr = *stack++; \
+ /* Use unlocked access here because except for NMIs \
+ we should be already protected against module unloads */ \
+ if (__kernel_text_address(addr)) { \
+ /* \
+ * If the address is either in the text segment of the \
+ * kernel, or in the region which contains vmalloc'ed \
+ * memory, it *may* be the address of a calling \
+ * routine; if so, print it so that someone tracing \
+ * down the cause of the crash will be able to figure \
+ * out the call path that was taken. \
+ */ \
+ ops->address(data, addr); \
+ } \
+ } while (0)
+
+ /*
+ * Print function call entries in all stacks, starting at the
+ * current stack address. If the stacks consist of nested
+ * exceptions
+ */
+ for (;;) {
+ char *id;
+ unsigned long *estack_end;
+ estack_end = in_exception_stack(cpu, (unsigned long)stack,
+ &used, &id);
+
+ if (estack_end) {
+ if (ops->stack(data, id) < 0)
+ break;
+ HANDLE_STACK (stack < estack_end);
+ ops->stack(data, "<EOE>");
/*
- * If the address is either in the text segment of the
- * kernel, or in the region which contains vmalloc'ed
- * memory, it *may* be the address of a calling
- * routine; if so, print it so that someone tracing
- * down the cause of the crash will be able to figure
- * out the call path that was taken.
+ * We link to the next stack via the
+ * second-to-last pointer (index -2 to end) in the
+ * exception stack:
*/
- if (kernel_text_address(addr)) {
- i += printk_address(addr);
- i += printk(" ");
- if (i > 50) {
- printk("\n ");
- i = 0;
- }
+ stack = (unsigned long *) estack_end[-2];
+ continue;
+ }
+ if (irqstack_end) {
+ unsigned long *irqstack;
+ irqstack = irqstack_end -
+ (IRQSTACKSIZE - 64) / sizeof(*irqstack);
+
+ if (stack >= irqstack && stack < irqstack_end) {
+ if (ops->stack(data, "IRQ") < 0)
+ break;
+ HANDLE_STACK (stack < irqstack_end);
+ /*
+ * We link to the next stack (which would be
+ * the process stack normally) the last
+ * pointer (index -1 to end) in the IRQ stack:
+ */
+ stack = (unsigned long *) (irqstack_end[-1]);
+ irqstack_end = NULL;
+ ops->stack(data, "EOI");
+ continue;
}
- }
- stack = (unsigned long *) (irqstack_end[-1]);
- printk(" <EOI> ");
- i += 7;
- }
-
- while (((long) stack & (THREAD_SIZE-1)) != 0) {
- addr = *stack++;
- if (kernel_text_address(addr)) {
- i += printk_address(addr);
- i += printk(" ");
- if (i > 50) {
- printk("\n ");
- i = 0;
- }
}
+ break;
}
+
+ /*
+ * This handles the process stack:
+ */
+ tinfo = task_thread_info(tsk);
+ HANDLE_STACK (valid_stack_ptr(tinfo, stack));
+#undef HANDLE_STACK
+ put_cpu();
+}
+EXPORT_SYMBOL(dump_trace);
+
+static void
+print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
+{
+ print_symbol(msg, symbol);
printk("\n");
}
-void show_stack(struct task_struct *tsk, unsigned long * rsp)
+static void print_trace_warning(void *data, char *msg)
+{
+ printk("%s\n", msg);
+}
+
+static int print_trace_stack(void *data, char *name)
+{
+ printk(" <%s> ", name);
+ return 0;
+}
+
+static void print_trace_address(void *data, unsigned long addr)
+{
+ printk_address(addr);
+}
+
+static struct stacktrace_ops print_trace_ops = {
+ .warning = print_trace_warning,
+ .warning_symbol = print_trace_warning_symbol,
+ .stack = print_trace_stack,
+ .address = print_trace_address,
+};
+
+void
+show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack)
+{
+ printk("\nCall Trace:\n");
+ dump_trace(tsk, regs, stack, &print_trace_ops, NULL);
+ printk("\n");
+}
+
+static void
+_show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp)
{
unsigned long *stack;
int i;
- const int cpu = safe_smp_processor_id();
- unsigned long *irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);
- unsigned long *irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE);
+ const int cpu = smp_processor_id();
+ unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr);
+ unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);
// debugging aid: "show_stack(NULL, NULL);" prints the
// back trace for this cpu.
break;
}
if (i && ((i % 4) == 0))
- printk("\n ");
- printk("%016lx ", *stack++);
+ printk("\n");
+ printk(" %016lx", *stack++);
+ touch_nmi_watchdog();
}
- show_trace((unsigned long *)rsp);
+ show_trace(tsk, regs, rsp);
+}
+
+void show_stack(struct task_struct *tsk, unsigned long * rsp)
+{
+ _show_stack(tsk, NULL, rsp);
}
/*
void dump_stack(void)
{
unsigned long dummy;
- show_trace(&dummy);
+ show_trace(NULL, NULL, &dummy);
}
EXPORT_SYMBOL(dump_stack);
void show_registers(struct pt_regs *regs)
{
int i;
- int in_kernel = (regs->cs & 3) == 0;
+ int in_kernel = !user_mode(regs);
unsigned long rsp;
- const int cpu = safe_smp_processor_id();
- struct task_struct *cur = cpu_pda[cpu].pcurrent;
+ const int cpu = smp_processor_id();
+ struct task_struct *cur = cpu_pda(cpu)->pcurrent;
rsp = regs->rsp;
printk("CPU %d ", cpu);
__show_regs(regs);
- printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
- cur->comm, cur->pid, cur->thread_info, cur);
+ printk("Process %s (pid: %d[#%u], threadinfo %p, task %p)\n",
+ cur->comm, cur->pid, cur->xid,
+ task_thread_info(cur), cur);
/*
* When in-kernel, we also print out the stack and code at the
if (in_kernel) {
printk("Stack: ");
- show_stack(NULL, (unsigned long*)rsp);
+ _show_stack(NULL, regs, (unsigned long*)rsp);
printk("\nCode: ");
- if(regs->rip < PAGE_OFFSET)
+ if (regs->rip < PAGE_OFFSET)
goto bad;
- for(i=0;i<20;i++)
- {
+ for (i=0; i<20; i++) {
unsigned char c;
- if(__get_user(c, &((unsigned char*)regs->rip)[i])) {
+ if (__get_user(c, &((unsigned char*)regs->rip)[i])) {
bad:
printk(" Bad RIP value.");
break;
printk("\n");
}
-void handle_BUG(struct pt_regs *regs)
-{
- struct bug_frame f;
- char tmp;
+int is_valid_bugaddr(unsigned long rip)
+{
+ unsigned short ud2;
- if (regs->cs & 3)
- return;
- if (__copy_from_user(&f, (struct bug_frame *) regs->rip,
- sizeof(struct bug_frame)))
- return;
- if ((unsigned long)f.filename < __PAGE_OFFSET ||
- f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
- return;
- if (__get_user(tmp, f.filename))
- f.filename = "unmapped filename";
- printk("----------- [cut here ] --------- [please bite here ] ---------\n");
- printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", f.filename, f.line);
-}
+ if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2)))
+ return 0;
+ return ud2 == 0x0b0f;
+}
+
+#ifdef CONFIG_BUG
void out_of_line_bug(void)
{
BUG();
}
+EXPORT_SYMBOL(out_of_line_bug);
+#endif
-static spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(die_lock);
static int die_owner = -1;
+static unsigned int die_nest_count;
-void oops_begin(void)
+unsigned __kprobes long oops_begin(void)
{
- int cpu = safe_smp_processor_id();
- /* racy, but better than risking deadlock. */
- local_irq_disable();
+ int cpu = smp_processor_id();
+ unsigned long flags;
+
+ oops_enter();
+
+ /* racy, but better than risking deadlock. */
+ local_irq_save(flags);
if (!spin_trylock(&die_lock)) {
if (cpu == die_owner)
/* nested oops. should stop eventually */;
else
- spin_lock(&die_lock);
+ spin_lock(&die_lock);
}
- die_owner = cpu;
+ die_nest_count++;
+ die_owner = cpu;
console_verbose();
- bust_spinlocks(1);
+ bust_spinlocks(1);
+ return flags;
}
-void oops_end(void)
+void __kprobes oops_end(unsigned long flags)
{
die_owner = -1;
- bust_spinlocks(0);
- spin_unlock(&die_lock);
- local_irq_enable(); /* make sure back scroll still works */
+ bust_spinlocks(0);
+ die_nest_count--;
+ if (die_nest_count)
+ /* We still own the lock */
+ local_irq_restore(flags);
+ else
+ /* Nest count reaches zero, release the lock. */
+ spin_unlock_irqrestore(&die_lock, flags);
if (panic_on_oops)
- panic("Oops");
-}
+ panic("Fatal exception");
+ oops_exit();
+}
-void __die(const char * str, struct pt_regs * regs, long err)
+void __kprobes __die(const char * str, struct pt_regs * regs, long err)
{
static int die_counter;
printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
#ifdef CONFIG_DEBUG_PAGEALLOC
printk("DEBUG_PAGEALLOC");
#endif
- printk("\n");
- notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
+ printk("\n");
+#ifdef CONFIG_SYSFS
+ printk(KERN_ALERT "last sysfs file: %s\n", last_sysfs_file);
+#endif
+ notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
show_registers(regs);
/* Executive summary in case the oops scrolled away */
printk(KERN_ALERT "RIP ");
printk_address(regs->rip);
printk(" RSP <%016lx>\n", regs->rsp);
+ if (kexec_should_crash(current))
+ crash_kexec(regs);
}
void die(const char * str, struct pt_regs * regs, long err)
{
- oops_begin();
- handle_BUG(regs);
+ unsigned long flags = oops_begin();
+
+ if (!user_mode(regs))
+ report_bug(regs->rip);
+
__die(str, regs, err);
- oops_end();
+ oops_end(flags);
do_exit(SIGSEGV);
}
-static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
-{
- if (!(regs->eflags & VM_MASK) && (regs->cs == __KERNEL_CS))
- die(str, regs, err);
-}
-static inline unsigned long get_cr2(void)
+void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
{
- unsigned long address;
+ unsigned long flags = oops_begin();
- /* get the address */
- __asm__("movq %%cr2,%0":"=r" (address));
- return address;
+ /*
+ * We are in trouble anyway, lets at least try
+ * to get a message out.
+ */
+ printk(str, smp_processor_id());
+ show_registers(regs);
+ if (kexec_should_crash(current))
+ crash_kexec(regs);
+ if (do_panic || panic_on_oops)
+ panic("Non maskable interrupt");
+ oops_end(flags);
+ nmi_exit();
+ local_irq_enable();
+ do_exit(SIGSEGV);
}
-static void do_trap(int trapnr, int signr, char *str,
- struct pt_regs * regs, long error_code, siginfo_t *info)
+static void __kprobes do_trap(int trapnr, int signr, char *str,
+ struct pt_regs * regs, long error_code,
+ siginfo_t *info)
{
- conditional_sti(regs);
-
-#ifdef CONFIG_CHECKING
- {
- unsigned long gs;
- struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
- rdmsrl(MSR_GS_BASE, gs);
- if (gs != (unsigned long)pda) {
- wrmsrl(MSR_GS_BASE, pda);
- printk("%s: wrong gs %lx expected %p rip %lx\n", str, gs, pda,
- regs->rip);
- }
- }
-#endif
+ struct task_struct *tsk = current;
- if ((regs->cs & 3) != 0) {
- struct task_struct *tsk = current;
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = trapnr;
+ if (user_mode(regs)) {
if (exception_trace && unhandled_signal(tsk, signr))
printk(KERN_INFO
- "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
- tsk->comm, tsk->pid, str,
- regs->rip,regs->rsp,error_code);
+ "%s[%d:#%u] trap %s rip:%lx rsp:%lx error:%lx\n",
+ tsk->comm, tsk->pid, tsk->xid, str,
+ regs->rip, regs->rsp, error_code);
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = trapnr;
if (info)
force_sig_info(signr, info, tsk);
else
{
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->rip);
- if (fixup) {
+ if (fixup)
regs->rip = fixup->fixup;
- } else
+ else
die(str, regs, error_code);
return;
}
#define DO_ERROR(trapnr, signr, str, name) \
asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
{ \
- if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) == NOTIFY_BAD) \
+ if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
+ == NOTIFY_STOP) \
return; \
+ conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, NULL); \
}
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
- info.si_addr = (void *)siaddr; \
- if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) == NOTIFY_BAD) \
+ info.si_addr = (void __user *)siaddr; \
+ if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
+ == NOTIFY_STOP) \
return; \
+ conditional_sti(regs); \
do_trap(trapnr, signr, str, regs, error_code, &info); \
}
DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip)
-DO_ERROR( 3, SIGTRAP, "int3", int3);
DO_ERROR( 4, SIGSEGV, "overflow", overflow)
DO_ERROR( 5, SIGSEGV, "bounds", bounds)
-DO_ERROR_INFO( 6, SIGILL, "invalid operand", invalid_op, ILL_ILLOPN, regs->rip)
+DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip)
DO_ERROR( 7, SIGSEGV, "device not available", device_not_available)
DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
-DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, get_cr2())
+DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
DO_ERROR(18, SIGSEGV, "reserved", reserved)
-#define DO_ERROR_STACK(trapnr, signr, str, name) \
-asmlinkage void *do_##name(struct pt_regs * regs, long error_code) \
-{ \
- struct pt_regs *pr = ((struct pt_regs *)(current->thread.rsp0))-1; \
- if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) == NOTIFY_BAD) \
- return regs; \
- if (regs->cs & 3) { \
- memcpy(pr, regs, sizeof(struct pt_regs)); \
- regs = pr; \
- } \
- do_trap(trapnr, signr, str, regs, error_code, NULL); \
- return regs; \
+/* Runs on IST stack */
+asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code)
+{
+ if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
+ 12, SIGBUS) == NOTIFY_STOP)
+ return;
+ preempt_conditional_sti(regs);
+ do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
+ preempt_conditional_cli(regs);
}
-DO_ERROR_STACK(12, SIGBUS, "stack segment", stack_segment)
-DO_ERROR_STACK( 8, SIGSEGV, "double fault", double_fault)
+asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
+{
+ static const char str[] = "double fault";
+ struct task_struct *tsk = current;
+
+ /* Return not checked because double check cannot be ignored */
+ notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
+
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 8;
+
+ /* This is always a kernel trap and never fixable (and thus must
+ never return). */
+ for (;;)
+ die(str, regs, error_code);
+}
-asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
+asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
+ long error_code)
{
- conditional_sti(regs);
+ struct task_struct *tsk = current;
-#ifdef CONFIG_CHECKING
- {
- unsigned long gs;
- struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
- rdmsrl(MSR_GS_BASE, gs);
- if (gs != (unsigned long)pda) {
- wrmsrl(MSR_GS_BASE, pda);
- oops_in_progress++;
- printk("general protection handler: wrong gs %lx expected %p\n", gs, pda);
- oops_in_progress--;
- }
- }
-#endif
+ conditional_sti(regs);
- if ((regs->cs & 3)!=0) {
- struct task_struct *tsk = current;
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 13;
+ if (user_mode(regs)) {
if (exception_trace && unhandled_signal(tsk, SIGSEGV))
printk(KERN_INFO
- "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
- tsk->comm, tsk->pid,
- regs->rip,regs->rsp,error_code);
+ "%s[%d:#%u] general protection rip:%lx rsp:%lx error:%lx\n",
+ tsk->comm, tsk->pid, tsk->xid,
+ regs->rip, regs->rsp, error_code);
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = 13;
force_sig(SIGSEGV, tsk);
- return;
+ return;
}
/* kernel gp */
regs->rip = fixup->fixup;
return;
}
- notify_die(DIE_GPF, "general protection fault", regs, error_code,
- 13, SIGSEGV);
+ if (notify_die(DIE_GPF, "general protection fault", regs,
+ error_code, 13, SIGSEGV) == NOTIFY_STOP)
+ return;
die("general protection fault", regs, error_code);
}
}
-static void mem_parity_error(unsigned char reason, struct pt_regs * regs)
+static __kprobes void
+mem_parity_error(unsigned char reason, struct pt_regs * regs)
{
- printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
- printk("You probably have a hardware problem with your RAM chips\n");
+ printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n",
+ reason);
+ printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n");
+
+ if (panic_on_unrecovered_nmi)
+ panic("NMI: Not continuing");
+
+ printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
/* Clear and disable the memory parity error line. */
reason = (reason & 0xf) | 4;
outb(reason, 0x61);
}
-static void io_check_error(unsigned char reason, struct pt_regs * regs)
+static __kprobes void
+io_check_error(unsigned char reason, struct pt_regs * regs)
{
printk("NMI: IOCK error (debug interrupt?)\n");
show_registers(regs);
outb(reason, 0x61);
}
-static void unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
-{ printk("Uhhuh. NMI received for unknown reason %02x.\n", reason);
- printk("Dazed and confused, but trying to continue\n");
- printk("Do you have a strange power saving mode enabled?\n");
+static __kprobes void
+unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
+{
+ printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n",
+ reason);
+ printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n");
+
+ if (panic_on_unrecovered_nmi)
+ panic("NMI: Not continuing");
+
+ printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
}
-asmlinkage void default_do_nmi(struct pt_regs * regs)
+/* Runs on IST stack. This code must keep interrupts off all the time.
+ Nested NMIs are prevented by the CPU. */
+asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs)
{
- unsigned char reason = inb(0x61);
+ unsigned char reason = 0;
+ int cpu;
+
+ cpu = smp_processor_id();
+
+ /* Only the BSP gets external NMIs from the system. */
+ if (!cpu)
+ reason = get_nmi_reason();
if (!(reason & 0xc0)) {
- if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 0, SIGINT) == NOTIFY_BAD)
+ if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
+ == NOTIFY_STOP)
return;
-#ifdef CONFIG_X86_LOCAL_APIC
/*
* Ok, so this is none of the documented NMI sources,
* so it must be the NMI watchdog.
*/
- if (nmi_watchdog > 0) {
- nmi_watchdog_tick(regs,reason);
+ if (nmi_watchdog_tick(regs,reason))
return;
- }
-#endif
- unknown_nmi_error(reason, regs);
+ if (!do_nmi_callback(regs,cpu))
+ unknown_nmi_error(reason, regs);
+
return;
}
- if (notify_die(DIE_NMI, "nmi", regs, reason, 0, SIGINT) == NOTIFY_BAD)
+ if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
return;
+
+ /* AK: following checks seem to be broken on modern chipsets. FIXME */
+
if (reason & 0x80)
mem_parity_error(reason, regs);
if (reason & 0x40)
io_check_error(reason, regs);
+}
- /*
- * Reassert NMI in case it became active meanwhile
- * as it's edge-triggered.
- */
- outb(0x8f, 0x70);
- inb(0x71); /* dummy */
- outb(0x0f, 0x70);
- inb(0x71); /* dummy */
+/* runs on IST stack. */
+asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
+{
+ if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
+ return;
+ }
+ preempt_conditional_sti(regs);
+ do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
+ preempt_conditional_cli(regs);
+}
+
+/* Help handler running on IST stack to switch back to user stack
+ for scheduling or signal handling. The actual stack switch is done in
+ entry.S */
+asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
+{
+ struct pt_regs *regs = eregs;
+ /* Did already sync */
+ if (eregs == (struct pt_regs *)eregs->rsp)
+ ;
+ /* Exception from user space */
+ else if (user_mode(eregs))
+ regs = task_pt_regs(current);
+ /* Exception from kernel and interrupts are enabled. Move to
+ kernel process stack. */
+ else if (eregs->eflags & X86_EFLAGS_IF)
+ regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs));
+ if (eregs != regs)
+ *regs = *eregs;
+ return regs;
}
/* runs on IST stack. */
-asmlinkage void *do_debug(struct pt_regs * regs, unsigned long error_code)
+asmlinkage void __kprobes do_debug(struct pt_regs * regs,
+ unsigned long error_code)
{
- struct pt_regs *pr;
unsigned long condition;
struct task_struct *tsk = current;
siginfo_t info;
- pr = (struct pt_regs *)(current->thread.rsp0)-1;
- if (regs->cs & 3) {
- memcpy(pr, regs, sizeof(struct pt_regs));
- regs = pr;
- }
-
-#ifdef CONFIG_CHECKING
- {
- /* RED-PEN interaction with debugger - could destroy gs */
- unsigned long gs;
- struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
- rdmsrl(MSR_GS_BASE, gs);
- if (gs != (unsigned long)pda) {
- wrmsrl(MSR_GS_BASE, pda);
- printk("debug handler: wrong gs %lx expected %p\n", gs, pda);
- }
- }
-#endif
+ get_debugreg(condition, 6);
- asm("movq %%db6,%0" : "=r" (condition));
+ if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
+ SIGTRAP) == NOTIFY_STOP)
+ return;
- conditional_sti(regs);
+ preempt_conditional_sti(regs);
/* Mask out spurious debug traps due to lazy DR7 setting */
if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
* allowing programs to debug themselves without the ptrace()
* interface.
*/
- if ((regs->cs & 3) == 0)
+ if (!user_mode(regs))
goto clear_TF_reenable;
- if ((tsk->ptrace & (PT_DTRACE|PT_PTRACED)) == PT_DTRACE)
- goto clear_TF;
}
/* Ok, finally something we can handle */
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_BRKPT;
- if ((regs->cs & 3) == 0)
- goto clear_dr7;
+ info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL;
+ force_sig_info(SIGTRAP, &info, tsk);
- info.si_addr = (void *)regs->rip;
- force_sig_info(SIGTRAP, &info, tsk);
clear_dr7:
- asm volatile("movq %0,%%db7"::"r"(0UL));
- notify_die(DIE_DEBUG, "debug", regs, condition, 1, SIGTRAP);
- return regs;
+ set_debugreg(0UL, 7);
+ preempt_conditional_cli(regs);
+ return;
clear_TF_reenable:
- printk("clear_tf_reenable\n");
set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
-
-clear_TF:
- /* RED-PEN could cause spurious errors */
- if (notify_die(DIE_DEBUG, "debug2", regs, condition, 1, SIGTRAP)
- != NOTIFY_BAD)
regs->eflags &= ~TF_MASK;
- return regs;
+ preempt_conditional_cli(regs);
+}
+
+static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
+{
+ const struct exception_table_entry *fixup;
+ fixup = search_exception_tables(regs->rip);
+ if (fixup) {
+ regs->rip = fixup->fixup;
+ return 1;
+ }
+ notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
+ /* Illegal floating point operation in the kernel */
+ current->thread.trap_no = trapnr;
+ die(str, regs, 0);
+ return 0;
}
/*
* the correct behaviour even in the presence of the asynchronous
* IRQ13 behaviour
*/
-void math_error(void *rip)
+asmlinkage void do_coprocessor_error(struct pt_regs *regs)
{
+ void __user *rip = (void __user *)(regs->rip);
struct task_struct * task;
siginfo_t info;
unsigned short cwd, swd;
+
+ conditional_sti(regs);
+ if (!user_mode(regs) &&
+ kernel_math_error(regs, "kernel x87 math error", 16))
+ return;
+
/*
* Save the info for the exception handler and clear the error.
*/
*/
cwd = get_fpu_cwd(task);
swd = get_fpu_swd(task);
- switch (((~cwd) & swd & 0x3f) | (swd & 0x240)) {
+ switch (swd & ~cwd & 0x3f) {
case 0x000:
default:
break;
case 0x001: /* Invalid Op */
- case 0x041: /* Stack Fault */
- case 0x241: /* Stack Fault | Direction */
+ /*
+ * swd & 0x240 == 0x040: Stack Underflow
+ * swd & 0x240 == 0x240: Stack Overflow
+ * User must clear the SF bit (0x40) if set
+ */
info.si_code = FPE_FLTINV;
break;
case 0x002: /* Denormalize */
force_sig_info(SIGFPE, &info, task);
}
-asmlinkage void do_coprocessor_error(struct pt_regs * regs)
-{
- conditional_sti(regs);
- math_error((void *)regs->rip);
-}
-
asmlinkage void bad_intr(void)
{
printk("bad interrupt");
}
-static inline void simd_math_error(void *rip)
+asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
{
+ void __user *rip = (void __user *)(regs->rip);
struct task_struct * task;
siginfo_t info;
unsigned short mxcsr;
+ conditional_sti(regs);
+ if (!user_mode(regs) &&
+ kernel_math_error(regs, "kernel simd math error", 19))
+ return;
+
/*
* Save the info for the exception handler and clear the error.
*/
force_sig_info(SIGFPE, &info, task);
}
-asmlinkage void do_simd_coprocessor_error(struct pt_regs * regs)
+asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
{
- conditional_sti(regs);
- simd_math_error((void *)regs->rip);
}
-asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
+asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
+{
+}
+
+asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
{
}
struct task_struct *me = current;
clts(); /* Allow maths ops (or we recurse) */
- if (!me->used_math)
+ if (!used_math())
init_fpu(me);
restore_fpu_checking(&me->thread.i387.fxsave);
- me->thread_info->status |= TS_USEDFPU;
-}
-
-void do_call_debug(struct pt_regs *regs)
-{
- notify_die(DIE_CALL, "debug call", regs, 0, 255, SIGINT);
+ task_thread_info(me)->status |= TS_USEDFPU;
+ me->fpu_counter++;
}
void __init trap_init(void)
set_intr_gate(0,÷_error);
set_intr_gate_ist(1,&debug,DEBUG_STACK);
set_intr_gate_ist(2,&nmi,NMI_STACK);
- set_system_gate(3,&int3); /* int3-5 can be called from all */
- set_system_gate(4,&overflow);
- set_system_gate(5,&bounds);
+ set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */
+ set_system_gate(4,&overflow); /* int4 can be called from all */
+ set_intr_gate(5,&bounds);
set_intr_gate(6,&invalid_op);
set_intr_gate(7,&device_not_available);
set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK);
set_intr_gate(15,&spurious_interrupt_bug);
set_intr_gate(16,&coprocessor_error);
set_intr_gate(17,&alignment_check);
+#ifdef CONFIG_X86_MCE
set_intr_gate_ist(18,&machine_check, MCE_STACK);
+#endif
set_intr_gate(19,&simd_coprocessor_error);
#ifdef CONFIG_IA32_EMULATION
set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
#endif
- set_intr_gate(KDB_VECTOR, call_debug);
-
/*
* Should be a barrier for any external CPU state.
*/
}
-/* Actual parsing is done early in setup.c. */
-static int __init oops_dummy(char *s)
+static int __init oops_setup(char *s)
{
- panic_on_oops = 1;
- return -1;
+ if (!s)
+ return -EINVAL;
+ if (!strcmp(s, "panic"))
+ panic_on_oops = 1;
+ return 0;
}
-__setup("oops=", oops_dummy);
+early_param("oops", oops_setup);
+
+static int __init kstack_setup(char *s)
+{
+ if (!s)
+ return -EINVAL;
+ kstack_depth_to_print = simple_strtoul(s,NULL,0);
+ return 0;
+}
+early_param("kstack", kstack_setup);
git://git.onelab.eu / linux-2.6.git / blobdiff