#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/nmi.h>
+#include <linux/kprobes.h>
+#include <linux/kexec.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/proto.h>
#include <asm/nmi.h>
-#include <linux/irq.h>
-
-
-extern struct gate_struct idt_table[256];
-
asmlinkage void divide_error(void);
asmlinkage void debug(void);
asmlinkage void nmi(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;
-static DEFINE_SPINLOCK(die_notifier_lock);
+ATOMIC_NOTIFIER_HEAD(die_chain);
+
+extern char last_sysfs_file[];
int register_die_notifier(struct notifier_block *nb)
{
- int err = 0;
- unsigned long flags;
- spin_lock_irqsave(&die_notifier_lock, flags);
- err = notifier_chain_register(&die_chain, nb);
- spin_unlock_irqrestore(&die_notifier_lock, flags);
- return err;
+ vmalloc_sync_all();
+ return atomic_notifier_chain_register(&die_chain, nb);
}
+EXPORT_SYMBOL(register_die_notifier);
+
+int unregister_die_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&die_chain, nb);
+}
+EXPORT_SYMBOL(unregister_die_notifier);
static inline void conditional_sti(struct pt_regs *regs)
{
local_irq_enable();
}
+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();
+}
+
static int kstack_depth_to_print = 10;
#ifdef CONFIG_KALLSYMS
if (!modname)
modname = delim = "";
return printk("<%016lx>{%s%s%s%s%+ld}",
- address,delim,modname,delim,symname,offset);
+ address, delim, modname, delim, symname, offset);
}
#else
int printk_address(unsigned long address)
static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
unsigned *usedp, const char **idp)
{
- static const char ids[N_EXCEPTION_STACKS][8] = {
+ 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;
for (k = 0; k < N_EXCEPTION_STACKS; k++) {
unsigned long end;
- end = per_cpu(init_tss, cpu).ist[k];
+ switch (k + 1) {
+#if DEBUG_STKSZ > EXCEPTION_STKSZ
+ case DEBUG_STACK:
+ end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ;
+ break;
+#endif
+ default:
+ end = per_cpu(init_tss, cpu).ist[k];
+ break;
+ }
if (stack >= end)
continue;
if (stack >= end - EXCEPTION_STKSZ) {
*idp = ids[k];
return (unsigned long *)end;
}
+#if DEBUG_STKSZ > EXCEPTION_STKSZ
+ if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
+ unsigned j = N_EXCEPTION_STACKS - 1;
+
+ 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 NULL;
}
void show_trace(unsigned long *stack)
{
- unsigned long addr;
const unsigned cpu = safe_smp_processor_id();
- unsigned long *irqstack_end = (unsigned long *)cpu_pda[cpu].irqstackptr;
+ unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
int i;
unsigned used = 0;
#define HANDLE_STACK(cond) \
do while (cond) { \
- addr = *stack++; \
+ unsigned long addr = *stack++; \
if (kernel_text_address(addr)) { \
+ if (i > 50) { \
+ printk("\n "); \
+ i = 0; \
+ } \
+ else \
+ i += printk(" "); \
/* \
* If the address is either in the text segment of the \
* kernel, or in the region which contains vmalloc'ed \
* out the call path that was taken. \
*/ \
i += printk_address(addr); \
- if (i > 50) { \
- printk("\n "); \
- i = 0; \
- } \
- else \
- i += printk(" "); \
} \
} while (0)
- for(i = 0; ; ) {
+ for(i = 11; ; ) {
const char *id;
unsigned long *estack_end;
estack_end = in_exception_stack(cpu, (unsigned long)stack,
&used, &id);
if (estack_end) {
- i += printk(" <%s> ", id);
+ i += printk(" <%s>", id);
HANDLE_STACK (stack < estack_end);
- i += printk(" <EOE> ");
+ i += printk(" <EOE>");
stack = (unsigned long *) estack_end[-2];
continue;
}
(IRQSTACKSIZE - 64) / sizeof(*irqstack);
if (stack >= irqstack && stack < irqstack_end) {
- i += printk(" <IRQ> ");
+ i += printk(" <IRQ>");
HANDLE_STACK (stack < irqstack_end);
stack = (unsigned long *) (irqstack_end[-1]);
irqstack_end = NULL;
- i += printk(" <EOI> ");
+ i += printk(" <EOI>");
continue;
}
}
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);
+ 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.
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;
+ 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
show_stack(NULL, (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;
void handle_BUG(struct pt_regs *regs)
{
struct bug_frame f;
- char tmp;
+ long len;
+ const char *prefix = "";
- if (regs->cs & 3)
+ if (user_mode(regs))
return;
- if (__copy_from_user(&f, (struct bug_frame *) regs->rip,
+ if (__copy_from_user(&f, (const void __user *) regs->rip,
sizeof(struct bug_frame)))
return;
- if ((unsigned long)f.filename < __PAGE_OFFSET ||
+ if (f.filename >= 0 ||
f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
return;
- if (__get_user(tmp, f.filename))
- f.filename = "unmapped filename";
+ len = __strnlen_user((char *)(long)f.filename, PATH_MAX) - 1;
+ if (len < 0 || len >= PATH_MAX)
+ f.filename = (int)(long)"unmapped filename";
+ else if (len > 50) {
+ f.filename += len - 50;
+ prefix = "...";
+ }
printk("----------- [cut here ] --------- [please bite here ] ---------\n");
- printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", f.filename, f.line);
+ printk(KERN_ALERT "Kernel BUG at %s%.50s:%d\n", prefix, (char *)(long)f.filename, f.line);
}
#ifdef CONFIG_BUG
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 = safe_smp_processor_id();
+ unsigned long flags;
+
+ /* 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);
+ 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("Oops");
+}
-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);
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
- notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
+#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();
+ unsigned long flags = oops_begin();
+
handle_BUG(regs);
__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);
-}
-void die_nmi(char *str, struct pt_regs *regs)
+void __kprobes die_nmi(char *str, struct pt_regs *regs)
{
- oops_begin();
+ unsigned long flags = oops_begin();
+
/*
* We are in trouble anyway, lets at least try
* to get a message out.
*/
printk(str, safe_smp_processor_id());
show_registers(regs);
+ if (kexec_should_crash(current))
+ crash_kexec(regs);
if (panic_on_timeout || panic_on_oops)
panic("nmi watchdog");
printk("console shuts up ...\n");
- oops_end();
+ 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);
+ 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;
}
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); \
}
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( 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, 0)
DO_ERROR(18, SIGSEGV, "reserved", reserved)
-DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
-DO_ERROR( 8, SIGSEGV, "double fault", double_fault)
-asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
+/* Runs on IST stack */
+asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code)
{
- conditional_sti(regs);
+ 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);
+}
-#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
+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);
- if ((regs->cs & 3)!=0) {
- struct task_struct *tsk = current;
+ 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 __kprobes do_general_protection(struct pt_regs * regs,
+ long error_code)
+{
+ struct task_struct *tsk = current;
+
+ conditional_sti(regs);
+
+ 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);
+ regs->rip, regs->rsp, error_code);
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = 13;
force_sig(SIGSEGV, tsk);
return;
}
}
}
-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");
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)
+static __kprobes 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");
/* Runs on IST stack. This code must keep interrupts off all the time.
Nested NMIs are prevented by the CPU. */
-asmlinkage void default_do_nmi(struct pt_regs *regs)
+asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs)
{
unsigned char reason = 0;
+ int cpu;
+
+ cpu = smp_processor_id();
/* Only the BSP gets external NMIs from the system. */
- if (!smp_processor_id())
+ if (!cpu)
reason = get_nmi_reason();
if (!(reason & 0xc0)) {
- if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 0, SIGINT)
+ if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
== NOTIFY_STOP)
return;
#ifdef CONFIG_X86_LOCAL_APIC
unknown_nmi_error(reason, regs);
return;
}
- if (notify_die(DIE_NMI, "nmi", regs, reason, 0, SIGINT) == NOTIFY_STOP)
+ if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
return;
/* AK: following checks seem to be broken on modern chipsets. FIXME */
io_check_error(reason, regs);
}
-asmlinkage void do_int3(struct pt_regs * regs, long error_code)
+/* 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);
- return;
+ 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 struct pt_regs *sync_regs(struct pt_regs *eregs)
+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 (eregs->cs & 3)
- regs = ((struct pt_regs *)current->thread.rsp0) - 1;
+ 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)
}
/* 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)
{
unsigned long condition;
struct task_struct *tsk = current;
siginfo_t info;
-#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
-
- asm("movq %%db6,%0" : "=r" (condition));
+ get_debugreg(condition, 6);
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;
/*
* Was the TF flag set by a debugger? If so, clear it now,
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 __user *)regs->rip;
- force_sig_info(SIGTRAP, &info, tsk);
clear_dr7:
- asm volatile("movq %0,%%db7"::"r"(0UL));
+ set_debugreg(0UL, 7);
+ preempt_conditional_cli(regs);
return;
clear_TF_reenable:
set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
regs->eflags &= ~TF_MASK;
+ preempt_conditional_cli(regs);
}
-static int kernel_math_error(struct pt_regs *regs, char *str)
+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);
regs->rip = fixup->fixup;
return 1;
}
- notify_die(DIE_GPF, str, regs, 0, 16, SIGFPE);
+ 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;
}
unsigned short cwd, swd;
conditional_sti(regs);
- if ((regs->cs & 3) == 0 &&
- kernel_math_error(regs, "kernel x87 math error"))
+ if (!user_mode(regs) &&
+ kernel_math_error(regs, "kernel x87 math error", 16))
return;
/*
*/
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 */
unsigned short mxcsr;
conditional_sti(regs);
- if ((regs->cs & 3) == 0 &&
- kernel_math_error(regs, "kernel simd math error"))
+ if (!user_mode(regs) &&
+ kernel_math_error(regs, "kernel simd math error", 19))
return;
/*
{
}
+asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
+{
+}
+
/*
* 'math_state_restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
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;
}
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);
- set_system_gate(4,&overflow); /* int4-5 can be called from all */
- 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_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
#endif
- set_intr_gate(KDB_VECTOR, call_debug);
-
/*
* Should be a barrier for any external CPU state.
*/
static int __init oops_dummy(char *s)
{
panic_on_oops = 1;
- return -1;
+ return 1;
}
__setup("oops=", oops_dummy);
static int __init kstack_setup(char *s)
{
kstack_depth_to_print = simple_strtoul(s,NULL,0);
- return 0;
+ return 1;
}
__setup("kstack=", kstack_setup);
git://git.onelab.eu / linux-2.6.git / blobdiff