* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'asm.s'.
*/
-#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/highmem.h>
#include <linux/kallsyms.h>
#include <linux/ptrace.h>
-#include <linux/version.h>
+#include <linux/utsname.h>
+#include <linux/kprobes.h>
+#include <linux/kexec.h>
+#include <linux/unwind.h>
+#include <linux/uaccess.h>
+#include <linux/nmi.h>
+#include <linux/bug.h>
#ifdef CONFIG_EISA
#include <linux/ioport.h>
#include <asm/processor.h>
#include <asm/system.h>
-#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/debugreg.h>
#include <asm/desc.h>
#include <asm/i387.h>
#include <asm/nmi.h>
-
+#include <asm/unwind.h>
#include <asm/smp.h>
-#include <asm/pgalloc.h>
#include <asm/arch_hooks.h>
+#include <asm/kdebug.h>
+#include <asm/stacktrace.h>
-#include <linux/irq.h>
#include <linux/module.h>
+#include <linux/vs_context.h>
+#include <linux/vserver/history.h>
#include "mach_traps.h"
-asmlinkage int system_call(void);
-asmlinkage void lcall7(void);
-asmlinkage void lcall27(void);
+int panic_on_unrecovered_nmi;
-struct desc_struct default_ldt[] = { { 0, 0 }, { 0, 0 }, { 0, 0 },
- { 0, 0 }, { 0, 0 } };
+asmlinkage int system_call(void);
/* Do we ignore FPU interrupts ? */
char ignore_fpu_irq = 0;
asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void);
-static int kstack_depth_to_print = 24;
+int kstack_depth_to_print = 24;
+ATOMIC_NOTIFIER_HEAD(i386die_chain);
+
+extern char last_sysfs_file[];
-static int valid_stack_ptr(struct task_struct *task, void *p)
+int register_die_notifier(struct notifier_block *nb)
{
- if (p <= (void *)task->thread_info)
- return 0;
- if (kstack_end(p))
- return 0;
- return 1;
+ vmalloc_sync_all();
+ return atomic_notifier_chain_register(&i386die_chain, nb);
}
+EXPORT_SYMBOL(register_die_notifier); /* used modular by kdb */
-#ifdef CONFIG_FRAME_POINTER
-void print_context_stack(struct task_struct *task, unsigned long *stack,
- unsigned long ebp)
+int unregister_die_notifier(struct notifier_block *nb)
{
- unsigned long addr;
+ return atomic_notifier_chain_unregister(&i386die_chain, nb);
+}
+EXPORT_SYMBOL(unregister_die_notifier); /* used modular by kdb */
- while (valid_stack_ptr(task, (void *)ebp)) {
- addr = *(unsigned long *)(ebp + 4);
- printk(" [<%08lx>] ", addr);
- print_symbol("%s", addr);
- printk("\n");
- ebp = *(unsigned long *)ebp;
- }
+static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+{
+ return p > (void *)tinfo &&
+ p < (void *)tinfo + THREAD_SIZE - 3;
}
-#else
-void print_context_stack(struct task_struct *task, unsigned long *stack,
- unsigned long ebp)
+
+static inline unsigned long print_context_stack(struct thread_info *tinfo,
+ unsigned long *stack, unsigned long ebp,
+ struct stacktrace_ops *ops, void *data)
{
unsigned long addr;
- while (!kstack_end(stack)) {
+#ifdef CONFIG_FRAME_POINTER
+ while (valid_stack_ptr(tinfo, (void *)ebp)) {
+ unsigned long new_ebp;
+ addr = *(unsigned long *)(ebp + 4);
+ ops->address(data, addr);
+ /*
+ * break out of recursive entries (such as
+ * end_of_stack_stop_unwind_function). Also,
+ * we can never allow a frame pointer to
+ * move downwards!
+ */
+ new_ebp = *(unsigned long *)ebp;
+ if (new_ebp <= ebp)
+ break;
+ ebp = new_ebp;
+ }
+#else
+ while (valid_stack_ptr(tinfo, stack)) {
addr = *stack++;
- if (kernel_text_address(addr)) {
- printk(" [<%08lx>] ", addr);
- print_symbol("%s\n", addr);
- }
+ if (__kernel_text_address(addr))
+ ops->address(data, addr);
}
-}
#endif
+ return ebp;
+}
-void show_trace(struct task_struct *task, unsigned long * stack)
+#define MSG(msg) ops->warning(data, msg)
+
+void dump_trace(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack,
+ struct stacktrace_ops *ops, void *data)
{
- unsigned long ebp;
+ unsigned long ebp = 0;
if (!task)
task = current;
- if (!valid_stack_ptr(task, stack)) {
- printk("Stack pointer is garbage, not printing trace\n");
- return;
+ if (!stack) {
+ unsigned long dummy;
+ stack = &dummy;
+ if (task && task != current)
+ stack = (unsigned long *)task->thread.esp;
}
- if (task == current) {
- /* Grab ebp right from our regs */
- asm ("movl %%ebp, %0" : "=r" (ebp) : );
- } else {
- /* ebp is the last reg pushed by switch_to */
- ebp = *(unsigned long *) task->thread.esp;
+#ifdef CONFIG_FRAME_POINTER
+ if (!ebp) {
+ if (task == current) {
+ /* Grab ebp right from our regs */
+ asm ("movl %%ebp, %0" : "=r" (ebp) : );
+ } else {
+ /* ebp is the last reg pushed by switch_to */
+ ebp = *(unsigned long *) task->thread.esp;
+ }
}
+#endif
while (1) {
struct thread_info *context;
context = (struct thread_info *)
((unsigned long)stack & (~(THREAD_SIZE - 1)));
- print_context_stack(task, stack, ebp);
+ ebp = print_context_stack(context, stack, ebp, ops, data);
+ /* Should be after the line below, but somewhere
+ in early boot context comes out corrupted and we
+ can't reference it -AK */
+ if (ops->stack(data, "IRQ") < 0)
+ break;
stack = (unsigned long*)context->previous_esp;
if (!stack)
break;
- printk(" =======================\n");
+ touch_nmi_watchdog();
}
+}
+EXPORT_SYMBOL(dump_trace);
+
+static void
+print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
+{
+ printk(data);
+ print_symbol(msg, symbol);
printk("\n");
}
-void show_stack(struct task_struct *task, unsigned long *esp)
+static void print_trace_warning(void *data, char *msg)
+{
+ printk("%s%s\n", (char *)data, msg);
+}
+
+static int print_trace_stack(void *data, char *name)
+{
+ return 0;
+}
+
+/*
+ * Print one address/symbol entries per line.
+ */
+static void print_trace_address(void *data, unsigned long addr)
+{
+ printk("%s [<%08lx>] ", (char *)data, addr);
+ print_symbol("%s\n", 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,
+};
+
+static void
+show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long * stack, char *log_lvl)
+{
+ dump_trace(task, regs, stack, &print_trace_ops, log_lvl);
+ printk("%s =======================\n", log_lvl);
+}
+
+void show_trace(struct task_struct *task, struct pt_regs *regs,
+ unsigned long * stack)
+{
+ show_trace_log_lvl(task, regs, stack, "");
+}
+
+static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *esp, char *log_lvl)
{
unsigned long *stack;
int i;
if (kstack_end(stack))
break;
if (i && ((i % 8) == 0))
- printk("\n ");
+ printk("\n%s ", log_lvl);
printk("%08lx ", *stack++);
}
- printk("\nCall Trace:\n");
- show_trace(task, esp);
+ printk("\n%sCall Trace:\n", log_lvl);
+ show_trace_log_lvl(task, regs, esp, log_lvl);
+}
+
+void show_stack(struct task_struct *task, unsigned long *esp)
+{
+ printk(" ");
+ show_stack_log_lvl(task, NULL, esp, "");
}
/*
{
unsigned long stack;
- show_trace(current, &stack);
+ show_trace(current, NULL, &stack);
}
EXPORT_SYMBOL(dump_stack);
unsigned short ss;
esp = (unsigned long) (®s->esp);
- ss = __KERNEL_DS;
- if (regs->xcs & 3) {
+ savesegment(ss, ss);
+ if (user_mode_vm(regs)) {
in_kernel = 0;
esp = regs->esp;
ss = regs->xss & 0xffff;
}
print_modules();
- printk("CPU: %d\nEIP: %04x:[<%08lx>] %s\nEFLAGS: %08lx"
- " (%s) \n",
+ printk(KERN_EMERG "CPU: %d\n"
+ KERN_EMERG "EIP: %04x:[<%08lx>] %s VLI\n"
+ KERN_EMERG "EFLAGS: %08lx (%s %.*s)\n",
smp_processor_id(), 0xffff & regs->xcs, regs->eip,
- print_tainted(), regs->eflags, UTS_RELEASE);
- print_symbol("EIP is at %s\n", regs->eip);
- printk("eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
+ print_tainted(), regs->eflags, init_utsname()->release,
+ (int)strcspn(init_utsname()->version, " "),
+ init_utsname()->version);
+ print_symbol(KERN_EMERG "EIP is at %s\n", regs->eip);
+ printk(KERN_EMERG "eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n",
regs->eax, regs->ebx, regs->ecx, regs->edx);
- printk("esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n",
+ printk(KERN_EMERG "esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n",
regs->esi, regs->edi, regs->ebp, esp);
- printk("ds: %04x es: %04x ss: %04x\n",
+ printk(KERN_EMERG "ds: %04x es: %04x ss: %04x\n",
regs->xds & 0xffff, regs->xes & 0xffff, ss);
- printk("Process %s (pid: %d, threadinfo=%p task=%p)",
- current->comm, current->pid, current_thread_info(), current);
+ printk(KERN_EMERG "Process %.*s (pid: %d[#%u], ti=%p task=%p task.ti=%p)",
+ TASK_COMM_LEN, current->comm, current->pid, current->xid,
+ current_thread_info(), current, current->thread_info);
/*
* When in-kernel, we also print out the stack and code at the
* time of the fault..
*/
if (in_kernel) {
+ u8 *eip;
+ int code_bytes = 64;
+ unsigned char c;
- printk("\nStack: ");
- show_stack(NULL, (unsigned long*)esp);
+ printk("\n" KERN_EMERG "Stack: ");
+ show_stack_log_lvl(NULL, regs, (unsigned long *)esp, KERN_EMERG);
- printk("Code: ");
- if(regs->eip < PAGE_OFFSET)
- goto bad;
+ printk(KERN_EMERG "Code: ");
- for(i=0;i<20;i++)
- {
- unsigned char c;
- if(__get_user(c, &((unsigned char*)regs->eip)[i])) {
-bad:
+ eip = (u8 *)regs->eip - 43;
+ if (eip < (u8 *)PAGE_OFFSET ||
+ probe_kernel_address(eip, c)) {
+ /* try starting at EIP */
+ eip = (u8 *)regs->eip;
+ code_bytes = 32;
+ }
+ for (i = 0; i < code_bytes; i++, eip++) {
+ if (eip < (u8 *)PAGE_OFFSET ||
+ probe_kernel_address(eip, c)) {
printk(" Bad EIP value.");
break;
}
- printk("%02x ", c);
+ if (eip == (u8 *)regs->eip)
+ printk("<%02x> ", c);
+ else
+ printk("%02x ", c);
}
}
printk("\n");
}
-static void handle_BUG(struct pt_regs *regs)
+int is_valid_bugaddr(unsigned long eip)
{
unsigned short ud2;
- unsigned short line;
- char *file;
- char c;
- unsigned long eip;
-
- if (regs->xcs & 3)
- goto no_bug; /* Not in kernel */
-
- eip = regs->eip;
if (eip < PAGE_OFFSET)
- goto no_bug;
- if (__get_user(ud2, (unsigned short *)eip))
- goto no_bug;
- if (ud2 != 0x0b0f)
- goto no_bug;
- if (__get_user(line, (unsigned short *)(eip + 2)))
- goto bug;
- if (__get_user(file, (char **)(eip + 4)) ||
- (unsigned long)file < PAGE_OFFSET || __get_user(c, file))
- file = "<bad filename>";
-
- printk("------------[ cut here ]------------\n");
- printk(KERN_ALERT "kernel BUG at %s:%d!\n", file, line);
-
-no_bug:
- return;
+ return 0;
+ if (probe_kernel_address((unsigned short *)eip, ud2))
+ return 0;
- /* Here we know it was a BUG but file-n-line is unavailable */
-bug:
- printk("Kernel BUG\n");
+ return ud2 == 0x0b0f;
}
-spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
-
+/*
+ * This is gone through when something in the kernel has done something bad and
+ * is about to be terminated.
+ */
void die(const char * str, struct pt_regs * regs, long err)
{
+ static struct {
+ spinlock_t lock;
+ u32 lock_owner;
+ int lock_owner_depth;
+ } die = {
+ .lock = __SPIN_LOCK_UNLOCKED(die.lock),
+ .lock_owner = -1,
+ .lock_owner_depth = 0
+ };
static int die_counter;
- int nl = 0;
+ unsigned long flags;
- console_verbose();
- spin_lock_irq(&die_lock);
- bust_spinlocks(1);
- handle_BUG(regs);
- printk(KERN_ALERT "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
+ oops_enter();
+
+ vxh_throw_oops();
+
+ if (die.lock_owner != raw_smp_processor_id()) {
+ console_verbose();
+ spin_lock_irqsave(&die.lock, flags);
+ die.lock_owner = smp_processor_id();
+ die.lock_owner_depth = 0;
+ bust_spinlocks(1);
+ }
+ else
+ local_save_flags(flags);
+
+ if (++die.lock_owner_depth < 3) {
+ int nl = 0;
+ unsigned long esp;
+ unsigned short ss;
+
+ report_bug(regs->eip);
+
+ printk(KERN_EMERG "%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
- printk("PREEMPT ");
- nl = 1;
+ printk(KERN_EMERG "PREEMPT ");
+ nl = 1;
#endif
#ifdef CONFIG_SMP
- printk("SMP ");
- nl = 1;
+ if (!nl)
+ printk(KERN_EMERG);
+ printk("SMP ");
+ nl = 1;
#endif
#ifdef CONFIG_DEBUG_PAGEALLOC
- printk("DEBUG_PAGEALLOC");
- nl = 1;
+ if (!nl)
+ printk(KERN_EMERG);
+ printk("DEBUG_PAGEALLOC");
+ nl = 1;
#endif
- if (nl)
- printk("\n");
- show_registers(regs);
+ if (nl)
+ printk("\n");
+#ifdef CONFIG_SYSFS
+ printk(KERN_ALERT "last sysfs file: %s\n", last_sysfs_file);
+#endif
+ if (notify_die(DIE_OOPS, str, regs, err,
+ current->thread.trap_no, SIGSEGV) != NOTIFY_STOP) {
+ show_registers(regs);
+ vxh_dump_history();
+ /* Executive summary in case the oops scrolled away */
+ esp = (unsigned long) (®s->esp);
+ savesegment(ss, ss);
+ if (user_mode(regs)) {
+ esp = regs->esp;
+ ss = regs->xss & 0xffff;
+ }
+ printk(KERN_EMERG "EIP: [<%08lx>] ", regs->eip);
+ print_symbol("%s", regs->eip);
+ printk(" SS:ESP %04x:%08lx\n", ss, esp);
+ }
+ else
+ regs = NULL;
+ } else
+ printk(KERN_EMERG "Recursive die() failure, output suppressed\n");
+
bust_spinlocks(0);
- spin_unlock_irq(&die_lock);
+ die.lock_owner = -1;
+ spin_unlock_irqrestore(&die.lock, flags);
+
+ if (!regs)
+ return;
+
+ if (kexec_should_crash(current))
+ crash_kexec(regs);
+
if (in_interrupt())
panic("Fatal exception in interrupt");
- if (panic_on_oops) {
- printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
- set_current_state(TASK_UNINTERRUPTIBLE);
- schedule_timeout(5 * HZ);
+ if (panic_on_oops)
panic("Fatal exception");
- }
+
+ oops_exit();
do_exit(SIGSEGV);
}
static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
{
- if (!(regs->eflags & VM_MASK) && !(3 & regs->xcs))
+ if (!user_mode_vm(regs))
die(str, regs, err);
}
-static inline unsigned long get_cr2(void)
+static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86,
+ struct pt_regs * regs, long error_code,
+ siginfo_t *info)
{
- unsigned long address;
-
- /* get the address */
- __asm__("movl %%cr2,%0":"=r" (address));
- return address;
-}
+ struct task_struct *tsk = current;
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = trapnr;
-static inline void do_trap(int trapnr, int signr, char *str, int vm86,
- struct pt_regs * regs, long error_code, siginfo_t *info)
-{
if (regs->eflags & VM_MASK) {
if (vm86)
goto vm86_trap;
goto trap_signal;
}
- if (!(regs->xcs & 3))
+ if (!user_mode(regs))
goto kernel_trap;
trap_signal: {
- struct task_struct *tsk = current;
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = trapnr;
if (info)
force_sig_info(signr, info, tsk);
else
}
#define DO_ERROR(trapnr, signr, str, name) \
-asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
+fastcall void do_##name(struct pt_regs * regs, long error_code) \
{ \
+ if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
+ == NOTIFY_STOP) \
+ return; \
do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \
}
#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
-asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
+fastcall void do_##name(struct pt_regs * regs, long error_code) \
{ \
siginfo_t info; \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
- info.si_addr = (void *)siaddr; \
+ info.si_addr = (void __user *)siaddr; \
+ if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
+ == NOTIFY_STOP) \
+ return; \
do_trap(trapnr, signr, str, 0, regs, error_code, &info); \
}
#define DO_VM86_ERROR(trapnr, signr, str, name) \
-asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
+fastcall void do_##name(struct pt_regs * regs, long error_code) \
{ \
+ if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
+ == NOTIFY_STOP) \
+ return; \
do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \
}
#define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
-asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
+fastcall void do_##name(struct pt_regs * regs, long error_code) \
{ \
siginfo_t info; \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
- info.si_addr = (void *)siaddr; \
+ info.si_addr = (void __user *)siaddr; \
+ if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
+ == NOTIFY_STOP) \
+ return; \
do_trap(trapnr, signr, str, 1, regs, error_code, &info); \
}
DO_VM86_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->eip)
+#ifndef CONFIG_KPROBES
DO_VM86_ERROR( 3, SIGTRAP, "int3", int3)
+#endif
DO_VM86_ERROR( 4, SIGSEGV, "overflow", overflow)
DO_VM86_ERROR( 5, SIGSEGV, "bounds", bounds)
-DO_ERROR_INFO( 6, SIGILL, "invalid operand", invalid_op, ILL_ILLOPN, regs->eip)
+DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->eip)
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(12, SIGBUS, "stack segment", stack_segment)
-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)
-asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
+
+/*
+ * lazy-check for CS validity on exec-shield binaries:
+ *
+ * the original non-exec stack patch was written by
+ * Solar Designer <solar at openwall.com>. Thanks!
+ */
+static int
+check_lazy_exec_limit(int cpu, struct pt_regs *regs, long error_code)
{
- if (regs->eflags & X86_EFLAGS_IF)
- local_irq_enable();
-
+ struct desc_struct *desc1, *desc2;
+ struct vm_area_struct *vma;
+ unsigned long limit;
+
+ if (current->mm == NULL)
+ return 0;
+
+ limit = -1UL;
+ if (current->mm->context.exec_limit != -1UL) {
+ limit = PAGE_SIZE;
+ spin_lock(¤t->mm->page_table_lock);
+ for (vma = current->mm->mmap; vma; vma = vma->vm_next)
+ if ((vma->vm_flags & VM_EXEC) && (vma->vm_end > limit))
+ limit = vma->vm_end;
+ spin_unlock(¤t->mm->page_table_lock);
+ if (limit >= TASK_SIZE)
+ limit = -1UL;
+ current->mm->context.exec_limit = limit;
+ }
+ set_user_cs(¤t->mm->context.user_cs, limit);
+
+ desc1 = ¤t->mm->context.user_cs;
+ desc2 = get_cpu_gdt_table(cpu) + GDT_ENTRY_DEFAULT_USER_CS;
+
+ if (desc1->a != desc2->a || desc1->b != desc2->b) {
+ /*
+ * The CS was not in sync - reload it and retry the
+ * instruction. If the instruction still faults then
+ * we won't hit this branch next time around.
+ */
+ if (print_fatal_signals >= 2) {
+ printk("#GPF fixup (%ld[seg:%lx]) at %08lx, CPU#%d.\n", error_code, error_code/8, regs->eip, smp_processor_id());
+ printk(" exec_limit: %08lx, user_cs: %08lx/%08lx, CPU_cs: %08lx/%08lx.\n", current->mm->context.exec_limit, desc1->a, desc1->b, desc2->a, desc2->b);
+ }
+ load_user_cs_desc(cpu, current->mm);
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
+ * The fixup code for errors in iret jumps to here (iret_exc). It loses
+ * the original trap number and error code. The bogus trap 32 and error
+ * code 0 are what the vanilla kernel delivers via:
+ * DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0)
+ *
+ * In case of a general protection fault in the iret instruction, we
+ * need to check for a lazy CS update for exec-shield.
+ */
+fastcall void do_iret_error(struct pt_regs *regs, long error_code)
+{
+ int ok = check_lazy_exec_limit(get_cpu(), regs, error_code);
+ put_cpu();
+ if (!ok && notify_die(DIE_TRAP, "iret exception", regs,
+ error_code, 32, SIGSEGV) != NOTIFY_STOP) {
+ siginfo_t info;
+ info.si_signo = SIGSEGV;
+ info.si_errno = 0;
+ info.si_code = ILL_BADSTK;
+ info.si_addr = 0;
+ do_trap(32, SIGSEGV, "iret exception", 0, regs, error_code,
+ &info);
+ }
+}
+
+fastcall void __kprobes do_general_protection(struct pt_regs * regs,
+ long error_code)
+{
+ int cpu = get_cpu();
+ struct tss_struct *tss = &per_cpu(init_tss, cpu);
+ struct thread_struct *thread = ¤t->thread;
+ int ok;
+
+ /*
+ * Perform the lazy TSS's I/O bitmap copy. If the TSS has an
+ * invalid offset set (the LAZY one) and the faulting thread has
+ * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS
+ * and we set the offset field correctly. Then we let the CPU to
+ * restart the faulting instruction.
+ */
+ if (tss->io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY &&
+ thread->io_bitmap_ptr) {
+ memcpy(tss->io_bitmap, thread->io_bitmap_ptr,
+ thread->io_bitmap_max);
+ /*
+ * If the previously set map was extending to higher ports
+ * than the current one, pad extra space with 0xff (no access).
+ */
+ if (thread->io_bitmap_max < tss->io_bitmap_max)
+ memset((char *) tss->io_bitmap +
+ thread->io_bitmap_max, 0xff,
+ tss->io_bitmap_max - thread->io_bitmap_max);
+ tss->io_bitmap_max = thread->io_bitmap_max;
+ tss->io_bitmap_base = IO_BITMAP_OFFSET;
+ tss->io_bitmap_owner = thread;
+ put_cpu();
+ return;
+ }
+
+ current->thread.error_code = error_code;
+ current->thread.trap_no = 13;
+
if (regs->eflags & VM_MASK)
goto gp_in_vm86;
- if (!(regs->xcs & 3))
+ if (!user_mode(regs))
goto gp_in_kernel;
+ ok = check_lazy_exec_limit(cpu, regs, error_code);
+
+ put_cpu();
+
+ if (ok)
+ return;
+
+ if (print_fatal_signals) {
+ printk("#GPF(%ld[seg:%lx]) at %08lx, CPU#%d.\n", error_code, error_code/8, regs->eip, smp_processor_id());
+ printk(" exec_limit: %08lx, user_cs: %08lx/%08lx.\n", current->mm->context.exec_limit, current->mm->context.user_cs.a, current->mm->context.user_cs.b);
+ }
+
current->thread.error_code = error_code;
current->thread.trap_no = 13;
force_sig(SIGSEGV, current);
return;
gp_in_vm86:
+ put_cpu();
local_irq_enable();
handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
return;
gp_in_kernel:
- if (!fixup_exception(regs))
+ put_cpu();
+ if (!fixup_exception(regs)) {
+ 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 on "
+ "CPU %d.\n", reason, smp_processor_id());
+ 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. */
clear_mem_error(reason);
}
-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)
{
- unsigned long i;
-
- printk("NMI: IOCK error (debug interrupt?)\n");
+ printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n");
show_registers(regs);
/* Re-enable the IOCK line, wait for a few seconds */
- reason = (reason & 0xf) | 8;
- outb(reason, 0x61);
- i = 2000;
- while (--i) udelay(1000);
- reason &= ~8;
- outb(reason, 0x61);
+ clear_io_check_error(reason);
}
-static void unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
+static __kprobes void
+unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
{
#ifdef CONFIG_MCA
/* Might actually be able to figure out what the guilty party
return;
}
#endif
- printk("Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
- reason, smp_processor_id());
- printk("Dazed and confused, but trying to continue\n");
- printk("Do you have a strange power saving mode enabled?\n");
+ printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x on "
+ "CPU %d.\n", reason, smp_processor_id());
+ 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");
+}
+
+static DEFINE_SPINLOCK(nmi_print_lock);
+
+void __kprobes die_nmi(struct pt_regs *regs, const char *msg)
+{
+ if (notify_die(DIE_NMIWATCHDOG, msg, regs, 0, 2, SIGINT) ==
+ NOTIFY_STOP)
+ return;
+
+ spin_lock(&nmi_print_lock);
+ /*
+ * We are in trouble anyway, lets at least try
+ * to get a message out.
+ */
+ bust_spinlocks(1);
+ printk(KERN_EMERG "%s", msg);
+ printk(" on CPU%d, eip %08lx, registers:\n",
+ smp_processor_id(), regs->eip);
+ show_registers(regs);
+ console_silent();
+ spin_unlock(&nmi_print_lock);
+ bust_spinlocks(0);
+
+ /* If we are in kernel we are probably nested up pretty bad
+ * and might aswell get out now while we still can.
+ */
+ if (!user_mode_vm(regs)) {
+ current->thread.trap_no = 2;
+ crash_kexec(regs);
+ }
+
+ do_exit(SIGSEGV);
}
-static void default_do_nmi(struct pt_regs * regs)
+static __kprobes void default_do_nmi(struct pt_regs * regs)
{
- unsigned char reason = get_nmi_reason();
+ unsigned char reason = 0;
+
+ /* Only the BSP gets external NMIs from the system. */
+ if (!smp_processor_id())
+ reason = get_nmi_reason();
if (!(reason & 0xc0)) {
+ 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) {
- nmi_watchdog_tick(regs);
+ if (nmi_watchdog_tick(regs, reason))
return;
- }
+ if (!do_nmi_callback(regs, smp_processor_id()))
#endif
- unknown_nmi_error(reason, regs);
+ unknown_nmi_error(reason, regs);
+
return;
}
+ if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
+ return;
if (reason & 0x80)
mem_parity_error(reason, regs);
if (reason & 0x40)
reassert_nmi();
}
-static int dummy_nmi_callback(struct pt_regs * regs, int cpu)
-{
- return 0;
-}
-
-static nmi_callback_t nmi_callback = dummy_nmi_callback;
-
-asmlinkage void do_nmi(struct pt_regs * regs, long error_code)
+fastcall __kprobes void do_nmi(struct pt_regs * regs, long error_code)
{
int cpu;
nmi_enter();
cpu = smp_processor_id();
+
++nmi_count(cpu);
- if (!nmi_callback(regs, cpu))
- default_do_nmi(regs);
+ default_do_nmi(regs);
nmi_exit();
}
-void set_nmi_callback(nmi_callback_t callback)
-{
- nmi_callback = callback;
-}
-
-void unset_nmi_callback(void)
+#ifdef CONFIG_KPROBES
+fastcall void __kprobes do_int3(struct pt_regs *regs, long error_code)
{
- nmi_callback = dummy_nmi_callback;
+ if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
+ == NOTIFY_STOP)
+ return;
+ /* This is an interrupt gate, because kprobes wants interrupts
+ disabled. Normal trap handlers don't. */
+ restore_interrupts(regs);
+ do_trap(3, SIGTRAP, "int3", 1, regs, error_code, NULL);
}
+#endif
/*
* Our handling of the processor debug registers is non-trivial.
* find every occurrence of the TF bit that could be saved away even
* by user code)
*/
-asmlinkage void do_debug(struct pt_regs * regs, long error_code)
+fastcall void __kprobes do_debug(struct pt_regs * regs, long error_code)
{
unsigned int condition;
struct task_struct *tsk = current;
- siginfo_t info;
- __asm__ __volatile__("movl %%db6,%0" : "=r" (condition));
+ get_debugreg(condition, 6);
+ if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
+ SIGTRAP) == NOTIFY_STOP)
+ return;
/* It's safe to allow irq's after DR6 has been saved */
if (regs->eflags & X86_EFLAGS_IF)
local_irq_enable();
/* Save debug status register where ptrace can see it */
tsk->thread.debugreg[6] = condition;
- /* Mask out spurious TF errors due to lazy TF clearing */
+ /*
+ * Single-stepping through TF: make sure we ignore any events in
+ * kernel space (but re-enable TF when returning to user mode).
+ */
if (condition & DR_STEP) {
/*
- * The TF error should be masked out only if the current
- * process is not traced and if the TRAP flag has been set
- * previously by a tracing process (condition detected by
- * the PT_DTRACE flag); remember that the i386 TRAP flag
- * can be modified by the process itself in user mode,
- * allowing programs to debug themselves without the ptrace()
- * interface.
+ * We already checked v86 mode above, so we can
+ * check for kernel mode by just checking the CPL
+ * of CS.
*/
- if ((regs->xcs & 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 */
- tsk->thread.trap_no = 1;
- tsk->thread.error_code = error_code;
- info.si_signo = SIGTRAP;
- info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
-
- /* If this is a kernel mode trap, save the user PC on entry to
- * the kernel, that's what the debugger can make sense of.
- */
- info.si_addr = ((regs->xcs & 3) == 0) ? (void *)tsk->thread.eip :
- (void *)regs->eip;
- force_sig_info(SIGTRAP, &info, tsk);
+ send_sigtrap(tsk, regs, error_code);
/* Disable additional traps. They'll be re-enabled when
* the signal is delivered.
*/
clear_dr7:
- __asm__("movl %0,%%db7"
- : /* no output */
- : "r" (0));
+ set_debugreg(0, 7);
return;
debug_vm86:
clear_TF_reenable:
set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
-clear_TF:
regs->eflags &= ~TF_MASK;
return;
}
* the correct behaviour even in the presence of the asynchronous
* IRQ13 behaviour
*/
-void math_error(void *eip)
+void math_error(void __user *eip)
{
struct task_struct * task;
siginfo_t info;
*/
cwd = get_fpu_cwd(task);
swd = get_fpu_swd(task);
- switch (((~cwd) & swd & 0x3f) | (swd & 0x240)) {
- case 0x000:
- default:
+ switch (swd & ~cwd & 0x3f) {
+ case 0x000: /* No unmasked exception */
+ return;
+ default: /* Multiple exceptions */
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;
- /* Should we clear the SF or let user space do it ???? */
break;
case 0x002: /* Denormalize */
case 0x010: /* Underflow */
force_sig_info(SIGFPE, &info, task);
}
-asmlinkage void do_coprocessor_error(struct pt_regs * regs, long error_code)
+fastcall void do_coprocessor_error(struct pt_regs * regs, long error_code)
{
ignore_fpu_irq = 1;
- math_error((void *)regs->eip);
+ math_error((void __user *)regs->eip);
}
-void simd_math_error(void *eip)
+static void simd_math_error(void __user *eip)
{
struct task_struct * task;
siginfo_t info;
force_sig_info(SIGFPE, &info, task);
}
-asmlinkage void do_simd_coprocessor_error(struct pt_regs * regs,
+fastcall void do_simd_coprocessor_error(struct pt_regs * regs,
long error_code)
{
if (cpu_has_xmm) {
/* Handle SIMD FPU exceptions on PIII+ processors. */
ignore_fpu_irq = 1;
- simd_math_error((void *)regs->eip);
+ simd_math_error((void __user *)regs->eip);
} else {
/*
* Handle strange cache flush from user space exception
error_code);
return;
}
- die_if_kernel("cache flush denied", regs, error_code);
current->thread.trap_no = 19;
current->thread.error_code = error_code;
+ die_if_kernel("cache flush denied", regs, error_code);
force_sig(SIGSEGV, current);
}
}
-asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs,
+fastcall void do_spurious_interrupt_bug(struct pt_regs * regs,
long error_code)
{
#if 0
#endif
}
+fastcall unsigned long patch_espfix_desc(unsigned long uesp,
+ unsigned long kesp)
+{
+ int cpu = smp_processor_id();
+ struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
+ struct desc_struct *gdt = (struct desc_struct *)cpu_gdt_descr->address;
+ unsigned long base = (kesp - uesp) & -THREAD_SIZE;
+ unsigned long new_kesp = kesp - base;
+ unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT;
+ __u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS];
+ /* Set up base for espfix segment */
+ desc &= 0x00f0ff0000000000ULL;
+ desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) |
+ ((((__u64)base) << 32) & 0xff00000000000000ULL) |
+ ((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) |
+ (lim_pages & 0xffff);
+ *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc;
+ return new_kesp;
+}
+
/*
* 'math_state_restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
* Must be called with kernel preemption disabled (in this case,
* local interrupts are disabled at the call-site in entry.S).
*/
-asmlinkage void math_state_restore(struct pt_regs regs)
+asmlinkage void math_state_restore(void)
{
struct thread_info *thread = current_thread_info();
struct task_struct *tsk = thread->task;
clts(); /* Allow maths ops (or we recurse) */
- if (!tsk->used_math)
+ if (!tsk_used_math(tsk))
init_fpu(tsk);
restore_fpu(tsk);
thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */
+ tsk->fpu_counter++;
}
#ifndef CONFIG_MATH_EMULATION
asmlinkage void math_emulate(long arg)
{
- printk("math-emulation not enabled and no coprocessor found.\n");
- printk("killing %s.\n",current->comm);
+ printk(KERN_EMERG "math-emulation not enabled and no coprocessor found.\n");
+ printk(KERN_EMERG "killing %s.\n",current->comm);
force_sig(SIGFPE,current);
schedule();
}
* it uses the read-only mapped virtual address.
*/
idt_descr.address = fix_to_virt(FIX_F00F_IDT);
- __asm__ __volatile__("lidt %0" : : "m" (idt_descr));
+ load_idt(&idt_descr);
}
#endif
-#define _set_gate(gate_addr,type,dpl,addr,seg) \
-do { \
- int __d0, __d1; \
- __asm__ __volatile__ ("movw %%dx,%%ax\n\t" \
- "movw %4,%%dx\n\t" \
- "movl %%eax,%0\n\t" \
- "movl %%edx,%1" \
- :"=m" (*((long *) (gate_addr))), \
- "=m" (*(1+(long *) (gate_addr))), "=&a" (__d0), "=&d" (__d1) \
- :"i" ((short) (0x8000+(dpl<<13)+(type<<8))), \
- "3" ((char *) (addr)),"2" ((seg) << 16)); \
-} while (0)
-
-
/*
* This needs to use 'idt_table' rather than 'idt', and
* thus use the _nonmapped_ version of the IDT, as the
*/
void set_intr_gate(unsigned int n, void *addr)
{
- _set_gate(idt_table+n,14,0,addr,__KERNEL_CS);
+ _set_gate(n, DESCTYPE_INT, addr, __KERNEL_CS);
}
-static void __init set_trap_gate(unsigned int n, void *addr)
+/*
+ * This routine sets up an interrupt gate at directory privilege level 3.
+ */
+static inline void set_system_intr_gate(unsigned int n, void *addr)
{
- _set_gate(idt_table+n,15,0,addr,__KERNEL_CS);
+ _set_gate(n, DESCTYPE_INT | DESCTYPE_DPL3, addr, __KERNEL_CS);
}
-static void __init set_system_gate(unsigned int n, void *addr)
+static void __init set_trap_gate(unsigned int n, void *addr)
{
- _set_gate(idt_table+n,15,3,addr,__KERNEL_CS);
+ _set_gate(n, DESCTYPE_TRAP, addr, __KERNEL_CS);
}
-static void __init set_call_gate(void *a, void *addr)
+static void __init set_system_gate(unsigned int n, void *addr)
{
- _set_gate(a,12,3,addr,__KERNEL_CS);
+ _set_gate(n, DESCTYPE_TRAP | DESCTYPE_DPL3, addr, __KERNEL_CS);
}
static void __init set_task_gate(unsigned int n, unsigned int gdt_entry)
{
- _set_gate(idt_table+n,5,0,0,(gdt_entry<<3));
+ _set_gate(n, DESCTYPE_TASK, (void *)0, (gdt_entry<<3));
}
void __init trap_init(void)
{
#ifdef CONFIG_EISA
- if (isa_readl(0x0FFFD9) == 'E'+('I'<<8)+('S'<<16)+('A'<<24)) {
+ void __iomem *p = ioremap(0x0FFFD9, 4);
+ if (readl(p) == 'E'+('I'<<8)+('S'<<16)+('A'<<24)) {
EISA_bus = 1;
}
+ iounmap(p);
#endif
#ifdef CONFIG_X86_LOCAL_APIC
set_trap_gate(0,÷_error);
set_intr_gate(1,&debug);
set_intr_gate(2,&nmi);
- set_system_gate(3,&int3); /* int3-5 can be called from all */
+ set_system_intr_gate(3, &int3); /* int3/4 can be called from all */
set_system_gate(4,&overflow);
- set_system_gate(5,&bounds);
+ set_trap_gate(5,&bounds);
set_trap_gate(6,&invalid_op);
set_trap_gate(7,&device_not_available);
set_task_gate(8,GDT_ENTRY_DOUBLEFAULT_TSS);
#endif
set_trap_gate(19,&simd_coprocessor_error);
- set_system_gate(SYSCALL_VECTOR,&system_call);
+ if (cpu_has_fxsr) {
+ /*
+ * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
+ * Generates a compile-time "error: zero width for bit-field" if
+ * the alignment is wrong.
+ */
+ struct fxsrAlignAssert {
+ int _:!(offsetof(struct task_struct,
+ thread.i387.fxsave) & 15);
+ };
+
+ printk(KERN_INFO "Enabling fast FPU save and restore... ");
+ set_in_cr4(X86_CR4_OSFXSR);
+ printk("done.\n");
+ }
+ if (cpu_has_xmm) {
+ printk(KERN_INFO "Enabling unmasked SIMD FPU exception "
+ "support... ");
+ set_in_cr4(X86_CR4_OSXMMEXCPT);
+ printk("done.\n");
+ }
- /*
- * default LDT is a single-entry callgate to lcall7 for iBCS
- * and a callgate to lcall27 for Solaris/x86 binaries
- */
- set_call_gate(&default_ldt[0],lcall7);
- set_call_gate(&default_ldt[4],lcall27);
+ set_system_gate(SYSCALL_VECTOR,&system_call);
/*
* Should be a barrier for any external CPU state.
trap_init_hook();
}
+
+static int __init kstack_setup(char *s)
+{
+ kstack_depth_to_print = simple_strtoul(s, NULL, 0);
+ return 1;
+}
+__setup("kstack=", kstack_setup);
git://git.onelab.eu / linux-2.6.git / blobdiff