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Commit b5964405 authored by Ingo Molnar's avatar Ingo Molnar
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x86: clean up traps_32.c 

Before:
   total: 86 errors, 29 warnings, 1248 lines checked
After:
   total: 0 errors, 17 warnings, 1281 lines checked

No code changed:

arch/x86/kernel/traps_32.o:

   text	   data	    bss	    dec	    hex	filename
   8711	   2168	     72	  10951	   2ac7	traps_32.o.before
   8711	   2168	     72	  10951	   2ac7	traps_32.o.after

(md5 sums differ because some stack offset positions changed.)
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 10cd5a1e
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Inline Side-by-side
Showing with 318 additions and 286 deletions
arch/x86/kernel/traps_32.c
View file @ b5964405
......@@ -9,26 +9,28 @@
* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'asm.s'.
*/
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/kallsyms.h>
#include <linux/spinlock.h>
#include <linux/highmem.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/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/highmem.h>
#include <linux/kallsyms.h>
#include <linux/ptrace.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>
#include <linux/nmi.h>
#include <linux/mm.h>
#ifdef CONFIG_EISA
#include <linux/ioport.h>
......@@ -43,21 +45,18 @@
#include <linux/edac.h>
#endif
#include <asm/arch_hooks.h>
#include <asm/stacktrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/atomic.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/nmi.h>
#include <asm/unwind.h>
#include <asm/smp.h>
#include <asm/arch_hooks.h>
#include <linux/kdebug.h>
#include <asm/stacktrace.h>
#include <linux/module.h>
#include <asm/io.h>
#include "mach_traps.h"
......@@ -69,7 +68,7 @@ EXPORT_SYMBOL_GPL(used_vectors);
asmlinkage int system_call(void);
/* Do we ignore FPU interrupts ? */
char ignore_fpu_irq = 0;
char ignore_fpu_irq;
/*
* The IDT has to be page-aligned to simplify the Pentium
......@@ -105,12 +104,13 @@ static unsigned int code_bytes = 64;
void printk_address(unsigned long address, int reliable)
{
#ifdef CONFIG_KALLSYMS
unsigned long offset = 0, symsize;
char namebuf[KSYM_NAME_LEN];
unsigned long offset = 0;
unsigned long symsize;
const char *symname;
char *modname;
char *delim = ":";
char namebuf[128];
char reliab[4] = "";
char *delim = ":";
char *modname;
symname = kallsyms_lookup(address, &symsize, &offset,
&modname, namebuf);
......@@ -138,13 +138,14 @@ static inline int valid_stack_ptr(struct thread_info *tinfo, void *p, unsigned s
/* The form of the top of the frame on the stack */
struct stack_frame {
struct stack_frame *next_frame;
unsigned long return_address;
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)
static inline unsigned long
print_context_stack(struct thread_info *tinfo,
unsigned long *stack, unsigned long bp,
const struct stacktrace_ops *ops, void *data)
{
struct stack_frame *frame = (struct stack_frame *)bp;
......@@ -166,7 +167,7 @@ static inline unsigned long print_context_stack(struct thread_info *tinfo,
return bp;
}
#define MSG(msg) ops->warning(data, msg)
#define MSG(msg) ops->warning(data, msg)
void dump_trace(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, unsigned long bp,
......@@ -177,6 +178,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
if (!stack) {
unsigned long dummy;
stack = &dummy;
if (task != current)
stack = (unsigned long *)task->thread.sp;
......@@ -186,7 +188,7 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
if (!bp) {
if (task == current) {
/* Grab bp right from our regs */
asm ("movl %%ebp, %0" : "=r" (bp) : );
asm("movl %%ebp, %0" : "=r" (bp) :);
} else {
/* bp is the last reg pushed by switch_to */
bp = *(unsigned long *) task->thread.sp;
......@@ -196,15 +198,18 @@ void dump_trace(struct task_struct *task, struct pt_regs *regs,
while (1) {
struct thread_info *context;
context = (struct thread_info *)
((unsigned long)stack & (~(THREAD_SIZE - 1)));
bp = print_context_stack(context, stack, bp, ops, data);
/* Should be after the line below, but somewhere
in early boot context comes out corrupted and we
can't reference it -AK */
/*
* Should be after the line below, but somewhere
* in early boot context comes out corrupted and we
* can't reference it:
*/
if (ops->stack(data, "IRQ") < 0)
break;
stack = (unsigned long*)context->previous_esp;
stack = (unsigned long *)context->previous_esp;
if (!stack)
break;
touch_nmi_watchdog();
......@@ -243,15 +248,15 @@ static void print_trace_address(void *data, unsigned long addr, int reliable)
}
static const struct stacktrace_ops print_trace_ops = {
.warning = print_trace_warning,
.warning_symbol = print_trace_warning_symbol,
.stack = print_trace_stack,
.address = print_trace_address,
.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, unsigned long bp, char *log_lvl)
unsigned long *stack, unsigned long bp, char *log_lvl)
{
dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
printk("%s =======================\n", log_lvl);
......@@ -263,21 +268,22 @@ void show_trace(struct task_struct *task, struct pt_regs *regs,
show_trace_log_lvl(task, regs, stack, bp, "");
}
static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *sp, unsigned long bp, char *log_lvl)
static void
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;
if (sp == NULL) {
if (task)
sp = (unsigned long*)task->thread.sp;
sp = (unsigned long *)task->thread.sp;
else
sp = (unsigned long *)&sp;
}
stack = sp;
for(i = 0; i < kstack_depth_to_print; i++) {
for (i = 0; i < kstack_depth_to_print; i++) {
if (kstack_end(stack))
break;
if (i && ((i % 8) == 0))
......@@ -285,6 +291,7 @@ static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
printk("%08lx ", *stack++);
}
printk("\n%sCall Trace:\n", log_lvl);
show_trace_log_lvl(task, regs, sp, bp, log_lvl);
}
......@@ -299,8 +306,8 @@ void show_stack(struct task_struct *task, unsigned long *sp)
*/
void dump_stack(void)
{
unsigned long stack;
unsigned long bp = 0;
unsigned long stack;
#ifdef CONFIG_FRAME_POINTER
if (!bp)
......@@ -312,6 +319,7 @@ void dump_stack(void)
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
init_utsname()->version);
show_trace(current, NULL, &stack, bp);
}
......@@ -323,6 +331,7 @@ void show_registers(struct pt_regs *regs)
print_modules();
__show_registers(regs, 0);
printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)",
TASK_COMM_LEN, current->comm, task_pid_nr(current),
current_thread_info(), current, task_thread_info(current));
......@@ -331,10 +340,10 @@ void show_registers(struct pt_regs *regs)
* time of the fault..
*/
if (!user_mode_vm(regs)) {
u8 *ip;
unsigned int code_prologue = code_bytes * 43 / 64;
unsigned int code_len = code_bytes;
unsigned char c;
u8 *ip;
printk("\n" KERN_EMERG "Stack: ");
show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);
......@@ -361,7 +370,7 @@ void show_registers(struct pt_regs *regs)
}
}
printk("\n");
}
}
int is_valid_bugaddr(unsigned long ip)
{
......@@ -377,10 +386,10 @@ int is_valid_bugaddr(unsigned long ip)
static int die_counter;
int __kprobes __die(const char * str, struct pt_regs * regs, long err)
int __kprobes __die(const char *str, struct pt_regs *regs, long err)
{
unsigned long sp;
unsigned short ss;
unsigned long sp;
printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
#ifdef CONFIG_PREEMPT
......@@ -395,8 +404,8 @@ int __kprobes __die(const char * str, struct pt_regs * regs, long err)
printk("\n");
if (notify_die(DIE_OOPS, str, regs, err,
current->thread.trap_no, SIGSEGV) !=
NOTIFY_STOP) {
current->thread.trap_no, SIGSEGV) != NOTIFY_STOP) {
show_registers(regs);
/* Executive summary in case the oops scrolled away */
sp = (unsigned long) (&regs->sp);
......@@ -408,17 +417,18 @@ int __kprobes __die(const char * str, struct pt_regs * regs, long err)
printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
print_symbol("%s", regs->ip);
printk(" SS:ESP %04x:%08lx\n", ss, sp);
return 0;
} else {
return 1;
}
return 1;
}
/*
* This is gone through when something in the kernel has done something bad and
* is about to be terminated.
* 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)
void die(const char *str, struct pt_regs *regs, long err)
{
static struct {
raw_spinlock_t lock;
......@@ -440,8 +450,9 @@ void die(const char * str, struct pt_regs * regs, long err)
die.lock_owner = smp_processor_id();
die.lock_owner_depth = 0;
bust_spinlocks(1);
} else
} else {
raw_local_irq_save(flags);
}
if (++die.lock_owner_depth < 3) {
report_bug(regs->ip, regs);
......@@ -474,15 +485,16 @@ void die(const char * str, struct pt_regs * regs, long err)
do_exit(SIGSEGV);
}
static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
static inline void
die_if_kernel(const char *str, struct pt_regs *regs, long err)
{
if (!user_mode_vm(regs))
die(str, regs, err);
}
static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86,
struct pt_regs * regs, long error_code,
siginfo_t *info)
static void __kprobes
do_trap(int trapnr, int signr, char *str, int vm86, struct pt_regs *regs,
long error_code, siginfo_t *info)
{
struct task_struct *tsk = current;
......@@ -495,111 +507,112 @@ static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86,
if (!user_mode(regs))
goto kernel_trap;
trap_signal: {
/*
* 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;
trap_signal:
/*
* 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 (info)
force_sig_info(signr, info, tsk);
else
force_sig(signr, tsk);
return;
}
if (info)
force_sig_info(signr, info, tsk);
else
force_sig(signr, tsk);
return;
kernel_trap: {
if (!fixup_exception(regs)) {
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;
vm86_trap: {
int ret = handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, trapnr);
if (ret) goto trap_signal;
return;
}
vm86_trap:
if (handle_vm86_trap((struct kernel_vm86_regs *) regs,
error_code, trapnr))
goto trap_signal;
return;
}
#define DO_ERROR(trapnr, signr, str, name) \
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(trapnr, signr, str, name) \
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, irq) \
void do_##name(struct pt_regs * regs, long error_code) \
{ \
siginfo_t info; \
if (irq) \
local_irq_enable(); \
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; \
do_trap(trapnr, signr, str, 0, regs, error_code, &info); \
#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr, irq) \
void do_##name(struct pt_regs *regs, long error_code) \
{ \
siginfo_t info; \
if (irq) \
local_irq_enable(); \
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; \
do_trap(trapnr, signr, str, 0, regs, error_code, &info); \
}
#define DO_VM86_ERROR(trapnr, signr, str, name) \
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(trapnr, signr, str, name) \
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) \
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; \
do_trap(trapnr, signr, str, 1, regs, error_code, &info); \
#define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
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; \
do_trap(trapnr, signr, str, 1, regs, error_code, &info); \
}
DO_VM86_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
DO_VM86_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
#ifndef CONFIG_KPROBES
DO_VM86_ERROR( 3, SIGTRAP, "int3", int3)
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 opcode", invalid_op, ILL_ILLOPN, regs->ip, 0)
DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
DO_VM86_ERROR(4, SIGSEGV, "overflow", overflow)
DO_VM86_ERROR(5, SIGSEGV, "bounds", bounds)
DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0)
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, 0, 0)
DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0, 1)
void __kprobes do_general_protection(struct pt_regs * regs,
long error_code)
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 = &current->thread;
struct thread_struct *thread;
struct tss_struct *tss;
int cpu;
cpu = get_cpu();
tss = &per_cpu(init_tss, cpu);
thread = &current->thread;
/*
* Perform the lazy TSS's I/O bitmap copy. If the TSS has an
......@@ -616,14 +629,16 @@ void __kprobes do_general_protection(struct pt_regs * regs,
* 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)
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->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET;
tss->io_bitmap_owner = thread;
put_cpu();
return;
}
put_cpu();
......@@ -636,6 +651,7 @@ void __kprobes do_general_protection(struct pt_regs * regs,
current->thread.error_code = error_code;
current->thread.trap_no = 13;
if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) &&
printk_ratelimit()) {
printk(KERN_INFO
......@@ -666,21 +682,24 @@ void __kprobes do_general_protection(struct pt_regs * regs,
}
static __kprobes void
mem_parity_error(unsigned char reason, struct pt_regs * regs)
mem_parity_error(unsigned char reason, struct pt_regs *regs)
{
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");
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 defined(CONFIG_EDAC)
if(edac_handler_set()) {
if (edac_handler_set()) {
edac_atomic_assert_error();
return;
}
#endif
if (panic_on_unrecovered_nmi)
panic("NMI: Not continuing");
panic("NMI: Not continuing");
printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
......@@ -689,7 +708,7 @@ mem_parity_error(unsigned char reason, struct pt_regs * regs)
}
static __kprobes void
io_check_error(unsigned char reason, struct pt_regs * regs)
io_check_error(unsigned char reason, struct pt_regs *regs)
{
unsigned long i;
......@@ -699,28 +718,35 @@ io_check_error(unsigned char reason, struct pt_regs * regs)
/* Re-enable the IOCK line, wait for a few seconds */
reason = (reason & 0xf) | 8;
outb(reason, 0x61);
i = 2000;
while (--i) udelay(1000);
while (--i)
udelay(1000);
reason &= ~8;
outb(reason, 0x61);
}
static __kprobes void
unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
{
#ifdef CONFIG_MCA
/* Might actually be able to figure out what the guilty party
* is. */
if( MCA_bus ) {
/*
* Might actually be able to figure out what the guilty party
* is:
*/
if (MCA_bus) {
mca_handle_nmi();
return;
}
#endif
printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x on "
"CPU %d.\n", reason, smp_processor_id());
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");
panic("NMI: Not continuing");
printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
}
......@@ -729,14 +755,13 @@ 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)
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.
* to get a message out:
*/
bust_spinlocks(1);
printk(KERN_EMERG "%s", msg);
......@@ -747,9 +772,10 @@ void __kprobes die_nmi(struct pt_regs *regs, const char *msg)
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 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);
......@@ -758,14 +784,14 @@ void __kprobes die_nmi(struct pt_regs *regs, const char *msg)
do_exit(SIGSEGV);
}
static __kprobes void default_do_nmi(struct pt_regs * regs)
static __kprobes void default_do_nmi(struct pt_regs *regs)
{
unsigned char reason = 0;
/* Only the BSP gets external NMIs from the system. */
/* 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)
......@@ -778,8 +804,10 @@ static __kprobes void default_do_nmi(struct pt_regs * regs)
if (nmi_watchdog_tick(regs, reason))
return;
if (!do_nmi_callback(regs, smp_processor_id()))
#endif
unknown_nmi_error(reason, regs);
#else
unknown_nmi_error(reason, regs);
#endif
return;
}
......@@ -791,14 +819,14 @@ static __kprobes void default_do_nmi(struct pt_regs * regs)
io_check_error(reason, regs);
/*
* Reassert NMI in case it became active meanwhile
* as it's edge-triggered.
* as it's edge-triggered:
*/
reassert_nmi();
}
static int ignore_nmis;
__kprobes void do_nmi(struct pt_regs * regs, long error_code)
__kprobes void do_nmi(struct pt_regs *regs, long error_code)
{
int cpu;
......@@ -834,9 +862,12 @@ 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;
/* This is an interrupt gate, because kprobes wants interrupts
disabled. Normal trap handlers don't. */
/*
* 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
......@@ -851,7 +882,7 @@ void __kprobes do_int3(struct pt_regs *regs, long error_code)
* from user space. Such code must not hold kernel locks (since it
* can equally take a page fault), therefore it is safe to call
* force_sig_info even though that claims and releases locks.
*
*
* Code in ./signal.c ensures that the debug control register
* is restored before we deliver any signal, and therefore that
* user code runs with the correct debug control register even though
......@@ -863,10 +894,10 @@ void __kprobes do_int3(struct pt_regs *regs, long error_code)
* find every occurrence of the TF bit that could be saved away even
* by user code)
*/
void __kprobes do_debug(struct pt_regs * regs, long error_code)
void __kprobes do_debug(struct pt_regs *regs, long error_code)
{
unsigned int condition;
struct task_struct *tsk = current;
unsigned int condition;
trace_hardirqs_fixup();
......@@ -914,7 +945,8 @@ void __kprobes do_debug(struct pt_regs * regs, long error_code)
/* Ok, finally something we can handle */
send_sigtrap(tsk, regs, error_code);
/* Disable additional traps. They'll be re-enabled when
/*
* Disable additional traps. They'll be re-enabled when
* the signal is delivered.
*/
clear_dr7:
......@@ -938,9 +970,10 @@ void __kprobes do_debug(struct pt_regs * regs, long error_code)
*/
void math_error(void __user *ip)
{
struct task_struct * task;
struct task_struct *task;
unsigned short cwd;
unsigned short swd;
siginfo_t info;
unsigned short cwd, swd;
/*
* Save the info for the exception handler and clear the error.
......@@ -966,36 +999,36 @@ void math_error(void __user *ip)
cwd = get_fpu_cwd(task);
swd = get_fpu_swd(task);
switch (swd & ~cwd & 0x3f) {
case 0x000: /* No unmasked exception */
return;
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;
case 0x000: /* No unmasked exception */
return;
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);
}
void do_coprocessor_error(struct pt_regs * regs, long error_code)
void do_coprocessor_error(struct pt_regs *regs, long error_code)
{
ignore_fpu_irq = 1;
math_error((void __user *)regs->ip);
......@@ -1003,9 +1036,9 @@ void do_coprocessor_error(struct pt_regs * regs, long error_code)
static void simd_math_error(void __user *ip)
{
struct task_struct * task;
siginfo_t info;
struct task_struct *task;
unsigned short mxcsr;
siginfo_t info;
/*
* Save the info for the exception handler and clear the error.
......@@ -1026,82 +1059,80 @@ static void simd_math_error(void __user *ip)
*/
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);
}
void do_simd_coprocessor_error(struct pt_regs * regs,
long error_code)
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 __user *)regs->ip);
} else {
/*
* Handle strange cache flush from user space exception
* in all other cases. This is undocumented behaviour.
*/
if (regs->flags & VM_MASK) {
handle_vm86_fault((struct kernel_vm86_regs *)regs,
error_code);
return;
}
current->thread.trap_no = 19;
current->thread.error_code = error_code;
die_if_kernel("cache flush denied", regs, error_code);
force_sig(SIGSEGV, current);
return;
}
/*
* Handle strange cache flush from user space exception
* in all other cases. This is undocumented behaviour.
*/
if (regs->flags & VM_MASK) {
handle_vm86_fault((struct kernel_vm86_regs *)regs, error_code);
return;
}
current->thread.trap_no = 19;
current->thread.error_code = error_code;
die_if_kernel("cache flush denied", regs, error_code);
force_sig(SIGSEGV, current);
}
void do_spurious_interrupt_bug(struct pt_regs * regs,
long error_code)
void do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
{
#if 0
/* No need to warn about this any longer. */
printk("Ignoring P6 Local APIC Spurious Interrupt Bug...\n");
printk(KERN_INFO "Ignoring P6 Local APIC Spurious Interrupt Bug...\n");
#endif
}
unsigned long patch_espfix_desc(unsigned long uesp,
unsigned long kesp)
unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
{
struct desc_struct *gdt = __get_cpu_var(gdt_page).gdt;
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) |
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
* '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.
......@@ -1115,7 +1146,7 @@ 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) */
clts(); /* Allow maths ops (or we recurse) */
if (!tsk_used_math(tsk))
init_fpu(tsk);
restore_fpu(tsk);
......@@ -1128,53 +1159,52 @@ EXPORT_SYMBOL_GPL(math_state_restore);
asmlinkage void math_emulate(long arg)
{
printk(KERN_EMERG "math-emulation not enabled and no coprocessor found.\n");
printk(KERN_EMERG "killing %s.\n",current->comm);
force_sig(SIGFPE,current);
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();
}
#endif /* CONFIG_MATH_EMULATION */
void __init trap_init(void)
{
int i;
#ifdef CONFIG_EISA
void __iomem *p = early_ioremap(0x0FFFD9, 4);
if (readl(p) == 'E'+('I'<<8)+('S'<<16)+('A'<<24)) {
if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
EISA_bus = 1;
}
early_iounmap(p, 4);
#endif
#ifdef CONFIG_X86_LOCAL_APIC
init_apic_mappings();
#endif
set_trap_gate(0,&divide_error);
set_intr_gate(1,&debug);
set_intr_gate(2,&nmi);
set_trap_gate(0, &divide_error);
set_intr_gate(1, &debug);
set_intr_gate(2, &nmi);
set_system_intr_gate(3, &int3); /* int3/4 can be called from all */
set_system_gate(4,&overflow);
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);
set_trap_gate(9,&coprocessor_segment_overrun);
set_trap_gate(10,&invalid_TSS);
set_trap_gate(11,&segment_not_present);
set_trap_gate(12,&stack_segment);
set_trap_gate(13,&general_protection);
set_intr_gate(14,&page_fault);
set_trap_gate(15,&spurious_interrupt_bug);
set_trap_gate(16,&coprocessor_error);
set_trap_gate(17,&alignment_check);
set_system_gate(4, &overflow);
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);
set_trap_gate(9, &coprocessor_segment_overrun);
set_trap_gate(10, &invalid_TSS);
set_trap_gate(11, &segment_not_present);
set_trap_gate(12, &stack_segment);
set_trap_gate(13, &general_protection);
set_intr_gate(14, &page_fault);
set_trap_gate(15, &spurious_interrupt_bug);
set_trap_gate(16, &coprocessor_error);
set_trap_gate(17, &alignment_check);
#ifdef CONFIG_X86_MCE
set_trap_gate(18,&machine_check);
set_trap_gate(18, &machine_check);
#endif
set_trap_gate(19,&simd_coprocessor_error);
set_trap_gate(19, &simd_coprocessor_error);
/*
* Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned.
......@@ -1187,21 +1217,22 @@ void __init trap_init(void)
printk("done.\n");
}
if (cpu_has_xmm) {
printk(KERN_INFO "Enabling unmasked SIMD FPU exception "
"support... ");
printk(KERN_INFO
"Enabling unmasked SIMD FPU exception support... ");
set_in_cr4(X86_CR4_OSXMMEXCPT);
printk("done.\n");
}
set_system_gate(SYSCALL_VECTOR,&system_call);
set_system_gate(SYSCALL_VECTOR, &system_call);
/* Reserve all the builtin and the syscall vector. */
/* Reserve all the builtin and the syscall vector: */
for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
set_bit(i, used_vectors);
set_bit(SYSCALL_VECTOR, used_vectors);
/*
* Should be a barrier for any external CPU state.
* Should be a barrier for any external CPU state:
*/
cpu_init();
......@@ -1211,6 +1242,7 @@ void __init trap_init(void)
static int __init kstack_setup(char *s)
{
kstack_depth_to_print = simple_strtoul(s, NULL, 0);
return 1;
}
__setup("kstack=", kstack_setup);
......
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