* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'entry.S'.
*/
-#include <linux/sched.h>
+#include <linux/moduleparam.h>
+#include <linux/interrupt.h>
+#include <linux/kallsyms.h>
+#include <linux/spinlock.h>
+#include <linux/kprobes.h>
+#include <linux/uaccess.h>
+#include <linux/utsname.h>
+#include <linux/kdebug.h>
#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/ptrace.h>
#include <linux/string.h>
+#include <linux/unwind.h>
+#include <linux/delay.h>
#include <linux/errno.h>
-#include <linux/ptrace.h>
+#include <linux/kexec.h>
+#include <linux/sched.h>
#include <linux/timer.h>
-#include <linux/mm.h>
#include <linux/init.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 <linux/kdebug.h>
+#include <linux/nmi.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/io.h>
#if defined(CONFIG_EDAC)
#include <linux/edac.h>
#endif
-#include <asm/system.h>
-#include <asm/io.h>
-#include <asm/atomic.h>
+#include <asm/stacktrace.h>
+#include <asm/processor.h>
#include <asm/debugreg.h>
+#include <asm/atomic.h>
+#include <asm/system.h>
+#include <asm/unwind.h>
#include <asm/desc.h>
#include <asm/i387.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 <asm/nmi.h>
-#include <asm/stacktrace.h>
+#include <asm/pda.h>
+#include <asm/traps.h>
+
+#include <mach_traps.h>
-asmlinkage void divide_error(void);
-asmlinkage void debug(void);
-asmlinkage void nmi(void);
-asmlinkage void int3(void);
-asmlinkage void overflow(void);
-asmlinkage void bounds(void);
-asmlinkage void invalid_op(void);
-asmlinkage void device_not_available(void);
-asmlinkage void double_fault(void);
-asmlinkage void coprocessor_segment_overrun(void);
-asmlinkage void invalid_TSS(void);
-asmlinkage void segment_not_present(void);
-asmlinkage void stack_segment(void);
-asmlinkage void general_protection(void);
-asmlinkage void page_fault(void);
-asmlinkage void coprocessor_error(void);
-asmlinkage void simd_coprocessor_error(void);
-asmlinkage void reserved(void);
-asmlinkage void alignment_check(void);
-asmlinkage void machine_check(void);
-asmlinkage void spurious_interrupt_bug(void);
+int panic_on_unrecovered_nmi;
+int kstack_depth_to_print = 12;
+static unsigned int code_bytes = 64;
+static int ignore_nmis;
+static int die_counter;
static inline void conditional_sti(struct pt_regs *regs)
{
- if (regs->eflags & X86_EFLAGS_IF)
+ if (regs->flags & X86_EFLAGS_IF)
local_irq_enable();
}
static inline void preempt_conditional_sti(struct pt_regs *regs)
{
- preempt_disable();
- if (regs->eflags & X86_EFLAGS_IF)
+ inc_preempt_count();
+ if (regs->flags & X86_EFLAGS_IF)
local_irq_enable();
}
static inline void preempt_conditional_cli(struct pt_regs *regs)
{
- if (regs->eflags & X86_EFLAGS_IF)
+ if (regs->flags & 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();
+ dec_preempt_count();
}
-int kstack_depth_to_print = 12;
-
-#ifdef CONFIG_KALLSYMS
-void printk_address(unsigned long address)
+void printk_address(unsigned long address, int reliable)
{
- unsigned long offset = 0, symsize;
- const char *symname;
- char *modname;
- char *delim = ":";
- char namebuf[128];
-
- symname = kallsyms_lookup(address, &symsize, &offset,
- &modname, namebuf);
- if (!symname) {
- printk(" [<%016lx>]\n", address);
- return;
- }
- if (!modname)
- modname = delim = "";
- printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n",
- address, delim, modname, delim, symname, offset, symsize);
+ printk(" [<%016lx>] %s%pS\n",
+ address, reliable ? "" : "? ", (void *) address);
}
-#else
-void printk_address(unsigned long address)
-{
- printk(" [<%016lx>]\n", address);
-}
-#endif
static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
unsigned *usedp, char **idp)
[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[?]"
+ [N_EXCEPTION_STACKS ...
+ N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
#endif
};
unsigned k;
return NULL;
}
-#define MSG(txt) ops->warning(data, txt)
-
/*
- * x86-64 can have upto three kernel stacks:
+ * x86-64 can have up to three kernel stacks:
* process stack
* interrupt stack
* severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
*/
-static inline int valid_stack_ptr(struct thread_info *tinfo, void *p)
+static inline int valid_stack_ptr(struct thread_info *tinfo,
+ void *p, unsigned int size, void *end)
+{
+ void *t = tinfo;
+ if (end) {
+ if (p < end && p >= (end-THREAD_SIZE))
+ return 1;
+ else
+ return 0;
+ }
+ return p > t && p < t + THREAD_SIZE - size;
+}
+
+/* The form of the top of the frame on the stack */
+struct stack_frame {
+ struct stack_frame *next_frame;
+ unsigned long return_address;
+};
+
+static inline unsigned long
+print_context_stack(struct thread_info *tinfo,
+ unsigned long *stack, unsigned long bp,
+ const struct stacktrace_ops *ops, void *data,
+ unsigned long *end)
{
- void *t = (void *)tinfo;
- return p > t && p < t + THREAD_SIZE - 3;
+ struct stack_frame *frame = (struct stack_frame *)bp;
+
+ while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
+ unsigned long addr;
+
+ addr = *stack;
+ if (__kernel_text_address(addr)) {
+ if ((unsigned long) stack == bp + 8) {
+ ops->address(data, addr, 1);
+ frame = frame->next_frame;
+ bp = (unsigned long) frame;
+ } else {
+ ops->address(data, addr, bp == 0);
+ }
+ }
+ stack++;
+ }
+ return bp;
}
-void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
- unsigned long *stack,
+void dump_trace(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data)
{
const unsigned cpu = get_cpu();
- unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr;
+ unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
unsigned used = 0;
struct thread_info *tinfo;
- if (!tsk)
- tsk = current;
+ if (!task)
+ task = current;
if (!stack) {
unsigned long dummy;
stack = &dummy;
- if (tsk && tsk != current)
- stack = (unsigned long *)tsk->thread.rsp;
+ if (task && task != current)
+ stack = (unsigned long *)task->thread.sp;
}
- /*
- * 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)
+#ifdef CONFIG_FRAME_POINTER
+ if (!bp) {
+ if (task == current) {
+ /* Grab bp right from our regs */
+ asm("movq %%rbp, %0" : "=r" (bp) : );
+ } else {
+ /* bp is the last reg pushed by switch_to */
+ bp = *(unsigned long *) task->thread.sp;
+ }
+ }
+#endif
/*
* Print function call entries in all stacks, starting at the
* current stack address. If the stacks consist of nested
* exceptions
*/
+ tinfo = task_thread_info(task);
for (;;) {
char *id;
unsigned long *estack_end;
if (estack_end) {
if (ops->stack(data, id) < 0)
break;
- HANDLE_STACK (stack < estack_end);
+
+ bp = print_context_stack(tinfo, stack, bp, ops,
+ data, estack_end);
ops->stack(data, "<EOE>");
/*
* We link to the next stack via the
if (stack >= irqstack && stack < irqstack_end) {
if (ops->stack(data, "IRQ") < 0)
break;
- HANDLE_STACK (stack < irqstack_end);
+ bp = print_context_stack(tinfo, stack, bp,
+ ops, data, irqstack_end);
/*
* We link to the next stack (which would be
* the process stack normally) the last
/*
* This handles the process stack:
*/
- tinfo = task_thread_info(tsk);
- HANDLE_STACK (valid_stack_ptr(tinfo, stack));
-#undef HANDLE_STACK
+ bp = print_context_stack(tinfo, stack, bp, ops, data, NULL);
put_cpu();
}
EXPORT_SYMBOL(dump_trace);
return 0;
}
-static void print_trace_address(void *data, unsigned long addr)
+static void print_trace_address(void *data, unsigned long addr, int reliable)
{
touch_nmi_watchdog();
- printk_address(addr);
+ printk_address(addr, reliable);
}
static const struct stacktrace_ops print_trace_ops = {
.address = print_trace_address,
};
-void
-show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack)
+static void
+show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack, unsigned long bp, char *log_lvl)
{
- printk("\nCall Trace:\n");
- dump_trace(tsk, regs, stack, &print_trace_ops, NULL);
- printk("\n");
+ printk("Call Trace:\n");
+ dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
+}
+
+void show_trace(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *stack, unsigned long bp)
+{
+ show_trace_log_lvl(task, regs, stack, bp, "");
}
static void
-_show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp)
+show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *sp, unsigned long bp, char *log_lvl)
{
unsigned long *stack;
int i;
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);
+ 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.
+ /*
+ * debugging aid: "show_stack(NULL, NULL);" prints the
+ * back trace for this cpu.
+ */
- if (rsp == NULL) {
- if (tsk)
- rsp = (unsigned long *)tsk->thread.rsp;
+ if (sp == NULL) {
+ if (task)
+ sp = (unsigned long *)task->thread.sp;
else
- rsp = (unsigned long *)&rsp;
+ sp = (unsigned long *)&sp;
}
- stack = rsp;
- for(i=0; i < kstack_depth_to_print; i++) {
+ stack = sp;
+ for (i = 0; i < kstack_depth_to_print; i++) {
if (stack >= irqstack && stack <= irqstack_end) {
if (stack == irqstack_end) {
stack = (unsigned long *) (irqstack_end[-1]);
printk(" %016lx", *stack++);
touch_nmi_watchdog();
}
- show_trace(tsk, regs, rsp);
+ printk("\n");
+ show_trace_log_lvl(task, regs, sp, bp, log_lvl);
}
-void show_stack(struct task_struct *tsk, unsigned long * rsp)
+void show_stack(struct task_struct *task, unsigned long *sp)
{
- _show_stack(tsk, NULL, rsp);
+ show_stack_log_lvl(task, NULL, sp, 0, "");
}
/*
*/
void dump_stack(void)
{
- unsigned long dummy;
- show_trace(NULL, NULL, &dummy);
-}
+ unsigned long bp = 0;
+ unsigned long stack;
+#ifdef CONFIG_FRAME_POINTER
+ if (!bp)
+ asm("movq %%rbp, %0" : "=r" (bp) : );
+#endif
+
+ printk("Pid: %d, comm: %.20s %s %s %.*s\n",
+ current->pid, current->comm, print_tainted(),
+ init_utsname()->release,
+ (int)strcspn(init_utsname()->version, " "),
+ init_utsname()->version);
+ show_trace(NULL, NULL, &stack, bp);
+}
EXPORT_SYMBOL(dump_stack);
void show_registers(struct pt_regs *regs)
{
int i;
- int in_kernel = !user_mode(regs);
- unsigned long rsp;
+ unsigned long sp;
const int cpu = smp_processor_id();
struct task_struct *cur = cpu_pda(cpu)->pcurrent;
- rsp = regs->rsp;
+ sp = regs->sp;
printk("CPU %d ", cpu);
__show_regs(regs);
printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
* When in-kernel, we also print out the stack and code at the
* time of the fault..
*/
- if (in_kernel) {
+ if (!user_mode(regs)) {
+ unsigned int code_prologue = code_bytes * 43 / 64;
+ unsigned int code_len = code_bytes;
+ unsigned char c;
+ u8 *ip;
+
printk("Stack: ");
- _show_stack(NULL, regs, (unsigned long*)rsp);
+ show_stack_log_lvl(NULL, regs, (unsigned long *)sp,
+ regs->bp, "");
- printk("\nCode: ");
- if (regs->rip < PAGE_OFFSET)
- goto bad;
+ printk(KERN_EMERG "Code: ");
- for (i=0; i<20; i++) {
- unsigned char c;
- if (__get_user(c, &((unsigned char*)regs->rip)[i])) {
-bad:
+ ip = (u8 *)regs->ip - code_prologue;
+ if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
+ /* try starting at RIP */
+ ip = (u8 *)regs->ip;
+ code_len = code_len - code_prologue + 1;
+ }
+ for (i = 0; i < code_len; i++, ip++) {
+ if (ip < (u8 *)PAGE_OFFSET ||
+ probe_kernel_address(ip, c)) {
printk(" Bad RIP value.");
break;
}
- printk("%02x ", c);
+ if (ip == (u8 *)regs->ip)
+ printk("<%02x> ", c);
+ else
+ printk("%02x ", c);
}
}
printk("\n");
-}
+}
-int is_valid_bugaddr(unsigned long rip)
+int is_valid_bugaddr(unsigned long ip)
{
unsigned short ud2;
- if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2)))
+ if (__copy_from_user(&ud2, (const void __user *) ip, 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 raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED;
static int die_owner = -1;
static unsigned int die_nest_count;
raw_local_irq_save(flags);
cpu = smp_processor_id();
if (!__raw_spin_trylock(&die_lock)) {
- if (cpu == die_owner)
+ if (cpu == die_owner)
/* nested oops. should stop eventually */;
else
__raw_spin_lock(&die_lock);
return flags;
}
-void __kprobes oops_end(unsigned long flags)
-{
+void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
+{
die_owner = -1;
bust_spinlocks(0);
die_nest_count--;
/* Nest count reaches zero, release the lock. */
__raw_spin_unlock(&die_lock);
raw_local_irq_restore(flags);
+ if (!regs) {
+ oops_exit();
+ return;
+ }
if (panic_on_oops)
panic("Fatal exception");
oops_exit();
+ do_exit(signr);
}
-void __kprobes __die(const char * str, struct pt_regs * regs, long err)
+int __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(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
printk("PREEMPT ");
#endif
printk("DEBUG_PAGEALLOC");
#endif
printk("\n");
- notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
+ if (notify_die(DIE_OOPS, str, regs, err,
+ current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
+ return 1;
+
show_registers(regs);
add_taint(TAINT_DIE);
/* Executive summary in case the oops scrolled away */
printk(KERN_ALERT "RIP ");
- printk_address(regs->rip);
- printk(" RSP <%016lx>\n", regs->rsp);
+ printk_address(regs->ip, 1);
+ printk(" RSP <%016lx>\n", regs->sp);
if (kexec_should_crash(current))
crash_kexec(regs);
+ return 0;
}
-void die(const char * str, struct pt_regs * regs, long err)
+void die(const char *str, struct pt_regs *regs, long err)
{
unsigned long flags = oops_begin();
if (!user_mode(regs))
- report_bug(regs->rip, regs);
+ report_bug(regs->ip, regs);
- __die(str, regs, err);
- oops_end(flags);
- do_exit(SIGSEGV);
+ if (__die(str, regs, err))
+ regs = NULL;
+ oops_end(flags, regs, SIGSEGV);
}
-void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
+notrace __kprobes void
+die_nmi(char *str, struct pt_regs *regs, int do_panic)
{
- unsigned long flags = oops_begin();
+ unsigned long flags;
+ if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
+ return;
+
+ flags = oops_begin();
/*
* We are in trouble anyway, lets at least try
* to get a message out.
*/
- printk(str, smp_processor_id());
+ printk(KERN_EMERG "%s", str);
+ printk(" on CPU%d, ip %08lx, registers:\n",
+ smp_processor_id(), regs->ip);
show_registers(regs);
if (kexec_should_crash(current))
crash_kexec(regs);
if (do_panic || panic_on_oops)
panic("Non maskable interrupt");
- oops_end(flags);
+ oops_end(flags, NULL, SIGBUS);
nmi_exit();
local_irq_enable();
- do_exit(SIGSEGV);
+ do_exit(SIGBUS);
}
-static void __kprobes 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)
{
struct task_struct *tsk = current;
- if (user_mode(regs)) {
- /*
- * We want error_code and trap_no set for userspace
- * faults and kernelspace faults which result in
- * die(), but not kernelspace faults which are fixed
- * up. die() gives the process no chance to handle
- * the signal and notice the kernel fault information,
- * so that won't result in polluting the information
- * about previously queued, but not yet delivered,
- * faults. See also do_general_protection below.
- */
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = trapnr;
-
- if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
- printk_ratelimit())
- 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);
+ if (!user_mode(regs))
+ goto kernel_trap;
- if (info)
- force_sig_info(signr, info, tsk);
- else
- force_sig(signr, tsk);
- return;
+ /*
+ * We want error_code and trap_no set for userspace faults and
+ * kernelspace faults which result in die(), but not
+ * kernelspace faults which are fixed up. die() gives the
+ * process no chance to handle the signal and notice the
+ * kernel fault information, so that won't result in polluting
+ * the information about previously queued, but not yet
+ * delivered, faults. See also do_general_protection below.
+ */
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = trapnr;
+
+ if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
+ printk_ratelimit()) {
+ printk(KERN_INFO
+ "%s[%d] trap %s ip:%lx sp:%lx error:%lx",
+ tsk->comm, tsk->pid, str,
+ regs->ip, regs->sp, error_code);
+ print_vma_addr(" in ", regs->ip);
+ printk("\n");
}
+ if (info)
+ force_sig_info(signr, info, tsk);
+ else
+ force_sig(signr, tsk);
+ return;
- /* kernel trap */
- {
- const struct exception_table_entry *fixup;
- fixup = search_exception_tables(regs->rip);
- if (fixup)
- regs->rip = fixup->fixup;
- else {
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = trapnr;
- die(str, regs, error_code);
- }
- return;
+kernel_trap:
+ if (!fixup_exception(regs)) {
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = trapnr;
+ 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_STOP) \
- return; \
+asmlinkage void do_##name(struct pt_regs *regs, long error_code) \
+{ \
+ 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); \
+ do_trap(trapnr, signr, str, 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) \
-{ \
- siginfo_t info; \
- info.si_signo = signr; \
- info.si_errno = 0; \
- info.si_code = sicode; \
- info.si_addr = (void __user *)siaddr; \
- if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
- == NOTIFY_STOP) \
- return; \
+#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
+asmlinkage 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 __user *)siaddr; \
+ trace_hardirqs_fixup(); \
+ 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_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 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_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
+DO_ERROR(4, SIGSEGV, "overflow", overflow)
+DO_ERROR(5, SIGSEGV, "bounds", bounds)
+DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip)
+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(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)
/* Runs on IST stack */
asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code)
preempt_conditional_cli(regs);
}
-asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
+asmlinkage void do_double_fault(struct pt_regs *regs, long error_code)
{
static const char str[] = "double fault";
struct task_struct *tsk = current;
die(str, regs, error_code);
}
-asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
- long error_code)
+asmlinkage void __kprobes
+do_general_protection(struct pt_regs *regs, long error_code)
{
- struct task_struct *tsk = current;
+ struct task_struct *tsk;
conditional_sti(regs);
- if (user_mode(regs)) {
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = 13;
+ tsk = current;
+ if (!user_mode(regs))
+ goto gp_in_kernel;
- if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
- printk_ratelimit())
- printk(KERN_INFO
- "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
- tsk->comm, tsk->pid,
- regs->rip, regs->rsp, error_code);
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 13;
+
+ if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
+ printk_ratelimit()) {
+ printk(KERN_INFO
+ "%s[%d] general protection ip:%lx sp:%lx error:%lx",
+ tsk->comm, tsk->pid,
+ regs->ip, regs->sp, error_code);
+ print_vma_addr(" in ", regs->ip);
+ printk("\n");
+ }
- force_sig(SIGSEGV, tsk);
+ force_sig(SIGSEGV, tsk);
+ return;
+
+gp_in_kernel:
+ if (fixup_exception(regs))
return;
- }
-
- /* kernel gp */
- {
- const struct exception_table_entry *fixup;
- fixup = search_exception_tables(regs->rip);
- if (fixup) {
- regs->rip = fixup->fixup;
- return;
- }
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = 13;
- if (notify_die(DIE_GPF, "general protection fault", regs,
- error_code, 13, SIGSEGV) == NOTIFY_STOP)
- return;
- die("general protection fault", regs, error_code);
- }
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 13;
+ if (notify_die(DIE_GPF, "general protection fault", regs,
+ error_code, 13, SIGSEGV) == NOTIFY_STOP)
+ return;
+ die("general protection fault", regs, error_code);
}
-static __kprobes void
-mem_parity_error(unsigned char reason, struct pt_regs * regs)
+static notrace __kprobes void
+mem_parity_error(unsigned char reason, struct pt_regs *regs)
{
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 defined(CONFIG_EDAC)
- if(edac_handler_set()) {
+ if (edac_handler_set()) {
edac_atomic_assert_error();
return;
}
outb(reason, 0x61);
}
-static __kprobes void
-io_check_error(unsigned char reason, struct pt_regs * regs)
+static notrace __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 __kprobes void
-unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
+static notrace __kprobes void
+unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
{
+ if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) ==
+ NOTIFY_STOP)
+ return;
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");
/* 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)
+asmlinkage notrace __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. */
+ /* Only the BSP gets external NMIs from the system. */
if (!cpu)
reason = get_nmi_reason();
* Ok, so this is none of the documented NMI sources,
* so it must be the NMI watchdog.
*/
- if (nmi_watchdog_tick(regs,reason))
+ if (nmi_watchdog_tick(regs, reason))
return;
- if (!do_nmi_callback(regs,cpu))
+ if (!do_nmi_callback(regs, cpu))
unknown_nmi_error(reason, regs);
return;
}
if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
- return;
+ 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);
}
+asmlinkage notrace __kprobes void
+do_nmi(struct pt_regs *regs, long error_code)
+{
+ nmi_enter();
+
+ add_pda(__nmi_count, 1);
+
+ if (!ignore_nmis)
+ default_do_nmi(regs);
+
+ nmi_exit();
+}
+
+void stop_nmi(void)
+{
+ acpi_nmi_disable();
+ ignore_nmis++;
+}
+
+void restart_nmi(void)
+{
+ ignore_nmis--;
+ acpi_nmi_enable();
+}
+
/* runs on IST stack. */
-asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
+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) {
+ trace_hardirqs_fixup();
+
+ 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);
{
struct pt_regs *regs = eregs;
/* Did already sync */
- if (eregs == (struct pt_regs *)eregs->rsp)
+ if (eregs == (struct pt_regs *)eregs->sp)
;
/* 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));
+ kernel process stack. */
+ else if (eregs->flags & X86_EFLAGS_IF)
+ regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs));
if (eregs != regs)
*regs = *eregs;
return regs;
}
/* runs on IST stack. */
-asmlinkage void __kprobes do_debug(struct pt_regs * regs,
+asmlinkage void __kprobes do_debug(struct pt_regs *regs,
unsigned long error_code)
{
- unsigned long condition;
struct task_struct *tsk = current;
+ unsigned long condition;
siginfo_t info;
+ trace_hardirqs_fixup();
+
get_debugreg(condition, 6);
+ /*
+ * The processor cleared BTF, so don't mark that we need it set.
+ */
+ clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR);
+ tsk->thread.debugctlmsr = 0;
+
if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
SIGTRAP) == NOTIFY_STOP)
return;
/* Mask out spurious debug traps due to lazy DR7 setting */
if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
- if (!tsk->thread.debugreg7) {
+ if (!tsk->thread.debugreg7)
goto clear_dr7;
- }
}
tsk->thread.debugreg6 = 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.
- */
- if (!user_mode(regs))
- goto clear_TF_reenable;
- /*
- * Was the TF flag set by a debugger? If so, clear it now,
- * so that register information is correct.
- */
- if (tsk->ptrace & PT_DTRACE) {
- regs->eflags &= ~TF_MASK;
- tsk->ptrace &= ~PT_DTRACE;
- }
+ if (!user_mode(regs))
+ goto clear_TF_reenable;
}
/* Ok, finally something we can handle */
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_BRKPT;
- info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL;
+ info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL;
force_sig_info(SIGTRAP, &info, tsk);
clear_dr7:
- set_debugreg(0UL, 7);
+ set_debugreg(0, 7);
preempt_conditional_cli(regs);
return;
clear_TF_reenable:
set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
- regs->eflags &= ~TF_MASK;
+ regs->flags &= ~X86_EFLAGS_TF;
preempt_conditional_cli(regs);
+ return;
}
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;
+ if (fixup_exception(regs))
return 1;
- }
+
notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
/* Illegal floating point operation in the kernel */
current->thread.trap_no = trapnr;
*/
asmlinkage void do_coprocessor_error(struct pt_regs *regs)
{
- void __user *rip = (void __user *)(regs->rip);
- struct task_struct * task;
+ void __user *ip = (void __user *)(regs->ip);
+ struct task_struct *task;
siginfo_t info;
unsigned short cwd, swd;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_code = __SI_FAULT;
- info.si_addr = rip;
+ info.si_addr = ip;
/*
* (~cwd & swd) will mask out exceptions that are not set to unmasked
* status. 0x3f is the exception bits in these regs, 0x200 is the
cwd = get_fpu_cwd(task);
swd = get_fpu_swd(task);
switch (swd & ~cwd & 0x3f) {
- case 0x000:
- default:
- break;
- case 0x001: /* Invalid Op */
- /*
- * 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 */
- case 0x010: /* Underflow */
- info.si_code = FPE_FLTUND;
- break;
- case 0x004: /* Zero Divide */
- info.si_code = FPE_FLTDIV;
- break;
- case 0x008: /* Overflow */
- info.si_code = FPE_FLTOVF;
- break;
- case 0x020: /* Precision */
- info.si_code = FPE_FLTRES;
- break;
+ case 0x000: /* No unmasked exception */
+ default: /* Multiple exceptions */
+ break;
+ case 0x001: /* Invalid Op */
+ /*
+ * 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 */
+ case 0x010: /* Underflow */
+ info.si_code = FPE_FLTUND;
+ break;
+ case 0x004: /* Zero Divide */
+ info.si_code = FPE_FLTDIV;
+ break;
+ case 0x008: /* Overflow */
+ info.si_code = FPE_FLTOVF;
+ break;
+ case 0x020: /* Precision */
+ info.si_code = FPE_FLTRES;
+ break;
}
force_sig_info(SIGFPE, &info, task);
}
asmlinkage void bad_intr(void)
{
- printk("bad interrupt");
+ printk("bad interrupt");
}
asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
{
- void __user *rip = (void __user *)(regs->rip);
- struct task_struct * task;
+ void __user *ip = (void __user *)(regs->ip);
+ 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))
+ kernel_math_error(regs, "kernel simd math error", 19))
return;
/*
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_code = __SI_FAULT;
- info.si_addr = rip;
+ info.si_addr = ip;
/*
* The SIMD FPU exceptions are handled a little differently, as there
* is only a single status/control register. Thus, to determine which
*/
mxcsr = get_fpu_mxcsr(task);
switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
- case 0x000:
- default:
- break;
- case 0x001: /* Invalid Op */
- info.si_code = FPE_FLTINV;
- break;
- case 0x002: /* Denormalize */
- case 0x010: /* Underflow */
- info.si_code = FPE_FLTUND;
- break;
- case 0x004: /* Zero Divide */
- info.si_code = FPE_FLTDIV;
- break;
- case 0x008: /* Overflow */
- info.si_code = FPE_FLTOVF;
- break;
- case 0x020: /* Precision */
- info.si_code = FPE_FLTRES;
- break;
+ case 0x000:
+ default:
+ break;
+ case 0x001: /* Invalid Op */
+ info.si_code = FPE_FLTINV;
+ break;
+ case 0x002: /* Denormalize */
+ case 0x010: /* Underflow */
+ info.si_code = FPE_FLTUND;
+ break;
+ case 0x004: /* Zero Divide */
+ info.si_code = FPE_FLTDIV;
+ break;
+ case 0x008: /* Overflow */
+ info.si_code = FPE_FLTOVF;
+ break;
+ case 0x020: /* Precision */
+ info.si_code = FPE_FLTRES;
+ break;
}
force_sig_info(SIGFPE, &info, task);
}
-asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
+asmlinkage void do_spurious_interrupt_bug(struct pt_regs *regs)
{
}
}
/*
- * 'math_state_restore()' saves the current math information in the
+ * 'math_state_restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
*
* Careful.. There are problems with IBM-designed IRQ13 behaviour.
asmlinkage void math_state_restore(void)
{
struct task_struct *me = current;
- clts(); /* Allow maths ops (or we recurse) */
- if (!used_math())
- init_fpu(me);
- restore_fpu_checking(&me->thread.i387.fxsave);
+ if (!used_math()) {
+ local_irq_enable();
+ /*
+ * does a slab alloc which can sleep
+ */
+ if (init_fpu(me)) {
+ /*
+ * ran out of memory!
+ */
+ do_group_exit(SIGKILL);
+ return;
+ }
+ local_irq_disable();
+ }
+
+ clts(); /* Allow maths ops (or we recurse) */
+ /*
+ * Paranoid restore. send a SIGSEGV if we fail to restore the state.
+ */
+ if (unlikely(restore_fpu_checking(&me->thread.xstate->fxsave))) {
+ stts();
+ force_sig(SIGSEGV, me);
+ return;
+ }
task_thread_info(me)->status |= TS_USEDFPU;
me->fpu_counter++;
}
+EXPORT_SYMBOL_GPL(math_state_restore);
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_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(9,&coprocessor_segment_overrun);
- set_intr_gate(10,&invalid_TSS);
- set_intr_gate(11,&segment_not_present);
- set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK);
- set_intr_gate(13,&general_protection);
- set_intr_gate(14,&page_fault);
- set_intr_gate(15,&spurious_interrupt_bug);
- set_intr_gate(16,&coprocessor_error);
- set_intr_gate(17,&alignment_check);
+ set_intr_gate(0, ÷_error);
+ set_intr_gate_ist(1, &debug, DEBUG_STACK);
+ set_intr_gate_ist(2, &nmi, NMI_STACK);
+ /* int3 can be called from all */
+ set_system_gate_ist(3, &int3, DEBUG_STACK);
+ /* int4 can be called from all */
+ set_system_gate(4, &overflow);
+ 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(9, &coprocessor_segment_overrun);
+ set_intr_gate(10, &invalid_TSS);
+ set_intr_gate(11, &segment_not_present);
+ set_intr_gate_ist(12, &stack_segment, STACKFAULT_STACK);
+ set_intr_gate(13, &general_protection);
+ set_intr_gate(14, &page_fault);
+ 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);
+ set_intr_gate_ist(18, &machine_check, MCE_STACK);
#endif
- set_intr_gate(19,&simd_coprocessor_error);
+ set_intr_gate(19, &simd_coprocessor_error);
#ifdef CONFIG_IA32_EMULATION
set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
#endif
-
/*
- * Should be a barrier for any external CPU state.
+ * initialize the per thread extended state:
+ */
+ init_thread_xstate();
+ /*
+ * Should be a barrier for any external CPU state:
*/
cpu_init();
}
-
static int __init oops_setup(char *s)
-{
+{
if (!s)
return -EINVAL;
if (!strcmp(s, "panic"))
panic_on_oops = 1;
return 0;
-}
+}
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);
+ kstack_depth_to_print = simple_strtoul(s, NULL, 0);
return 0;
}
early_param("kstack", kstack_setup);
+
+static int __init code_bytes_setup(char *s)
+{
+ code_bytes = simple_strtoul(s, NULL, 0);
+ if (code_bytes > 8192)
+ code_bytes = 8192;
+
+ return 1;
+}
+__setup("code_bytes=", code_bytes_setup);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff