3.1-rc5 dont boot

* 3.1-rc5 dont boot
@ 2011-09-10 20:37 werner
  2011-09-10 20:58 ` Linus Torvalds
  0 siblings, 1 reply; 10+ messages in thread
From: werner @ 2011-09-10 20:37 UTC (permalink / raw)
  To: linux-kernel, torvalds, yong.zhang0

Meanwhile someone mailed me the patch, and I applied it to 
the code, i.e. entry_32.S   . Please verify below that I 
patched it right.

Compiling everything, during booting it sticks and stops 
again, as before, but now some of the last error messages 
on the screen changed.      This means that the patch is 
really near the problem.

Below I indicated the CHANGES what happens now (probably 
by the patch) at the last error messages.

Perhaps this permits to find the problem.

The problem is the same, no matter if I start the computer 
normally, or using an initrd.

W.Landgraf

====================

  c1024274 no_context+0xbf/0xc7
  c1024409 _bad_area_nosemaphore+0x18d/0x198
  c10a7fb4 ? get_page_from_freelist+0x24b/0x293
  c10a5a07 ? __zone_watermark_ok+0xe/0x91
  c10a7c79 ? prep_new_page+0xe/0xfe
  c10a7fb4 ? get_page_from_freelist+0x24b/0x293
  c1f35cca ? raw_spin_lock_irqsave+0x1d/0x3a
  c102442b bad_area_nosemaphore+0x17/0x19
  c102472e do-page_fault+0x157/0x346
  c1f35d26 ? _raw_spin-unlock_irqrestore+0x16/0x18
  c15e2ef1 ? vgacon_scroll+0x29d/0x2bd
  c1021e14 ? native_irq_disable+0x8/0xb

   new added: c1f35cca ? __raw_spin_lock_irqsave+0x1d/0x3a
   new added: c1f35d26 ? 
__raw_spin_unlock_irqrestore+0x16/0x18
   unchanged: c1008d10 ? native_io_delay+0x8/0x30
   unchanged: c15e1b5c ? vgacon_set_curser_size+0xf7/0xfe
   unchanged: c105a54e ? notifier_call_chain+0xe/0x4f
   unchanged: c105a5d7 ? 
atomic_notifier_call_chain+0x22/0x24
   old:  c102468b ? mm_fault_error+0xcb/0xcb  new instead: 
c16c011c ? notify-update+0x27/0x29
   unchanged: c1f3be37 error_code+0x67/0x70
   new added: c100a967 ? xstateregs_set+0xd3 / 0xdb
   old:  c1007396 ? apply_alternatives+0xaf/0x167   new 
instead: c1007366 ? apply_alternatives+0x7f/0x167
   new added: c1001d88 ? lazy_hcall1+0x8a/0xc1

  c10a7fb4 ? get_page_from_freelist+0x24b/0x293
  c10a84cb ? __alloc_pages_nodemask+0x104/0x5de
  c24fd18d ? relocate_vdso+0x1b/0x266
  c24ef501 alternative_instructions+0x1a/0x10e
  c1021e5a ? native-write_cro+0x8/0xd
  c24f065c check_bugs+0x155/0x15a
  c1087094 ? delayacct_init+0x50/0x54
  c24e880a start_kernel+0x322/0x337
  c24e82fe ? kernel_init+0x116/0x116
  c24e80ac i386_start_kernel+0xac/0xb3

==========  hopefully correctly   patched subroutine:

/*
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  */

/*
  * entry.S contains the system-call and fault low-level 
handling routines.
  * This also contains the timer-interrupt handler, as 
well as all interrupts
  * and faults that can result in a task-switch.
  *
  * NOTE: This code handles signal-recognition, which 
happens every time
  * after a timer-interrupt and after each system call.
  *
  * I changed all the .align's to 4 (16 byte alignment), 
as that's faster
  * on a 486.
  *
  * Stack layout in 'syscall_exit':
  * 	ptrace needs to have all regs on the stack.
  *	if the order here is changed, it needs to be
  *	updated in fork.c:copy_process, signal.c:do_signal,
  *	ptrace.c and ptrace.h
  *
  *	 0(%esp) - %ebx
  *	 4(%esp) - %ecx
  *	 8(%esp) - %edx
  *       C(%esp) - %esi
  *	10(%esp) - %edi
  *	14(%esp) - %ebp
  *	18(%esp) - %eax
  *	1C(%esp) - %ds
  *	20(%esp) - %es
  *	24(%esp) - %fs
  *	28(%esp) - %gs		saved iff !CONFIG_X86_32_LAZY_GS
  *	2C(%esp) - orig_eax
  *	30(%esp) - %eip
  *	34(%esp) - %cs
  *	38(%esp) - %eflags
  *	3C(%esp) - %oldesp
  *	40(%esp) - %oldss
  *
  * "current" is in register %ebx during any slow entries.
  */

#include <linux/linkage.h>
#include <asm/thread_info.h>
#include <asm/irqflags.h>
#include <asm/errno.h>
#include <asm/segment.h>
#include <asm/smp.h>
#include <asm/page_types.h>
#include <asm/percpu.h>
#include <asm/dwarf2.h>
#include <asm/processor-flags.h>
#include <asm/ftrace.h>
#include <asm/irq_vectors.h>
#include <asm/cpufeature.h>
#include <asm/alternative-asm.h>

/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for 
this.  */
#include <linux/elf-em.h>
#define AUDIT_ARCH_I386		(EM_386|__AUDIT_ARCH_LE)
#define __AUDIT_ARCH_LE	   0x40000000

#ifndef CONFIG_AUDITSYSCALL
#define sysenter_audit	syscall_trace_entry
#define sysexit_audit	syscall_exit_work
#endif

	.section .entry.text, "ax"

/*
  * We use macros for low-level operations which need to 
be overridden
  * for paravirtualization.  The following will never 
clobber any registers:
  *   INTERRUPT_RETURN (aka. "iret")
  *   GET_CR0_INTO_EAX (aka. "movl %cr0, %eax")
  *   ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit").
  *
  * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka 
"cli"/"sti"), you must
  * specify what registers can be overwritten (CLBR_NONE, 
CLBR_EAX/EDX/ECX/ANY).
  * Allowing a register to be clobbered can shrink the 
paravirt replacement
  * enough to patch inline, increasing performance.
  */

#define nr_syscalls ((syscall_table_size)/4)

#ifdef CONFIG_PREEMPT
#define 
preempt_stop(clobbers)	DISABLE_INTERRUPTS(clobbers); 
TRACE_IRQS_OFF
#else
#define preempt_stop(clobbers)
#define resume_kernel		restore_all
#endif

.macro TRACE_IRQS_IRET
#ifdef CONFIG_TRACE_IRQFLAGS
	testl $X86_EFLAGS_IF,PT_EFLAGS(%esp)     # interrupts 
off?
	jz 1f
	TRACE_IRQS_ON
1:
#endif
.endm

#ifdef CONFIG_VM86
#define resume_userspace_sig	check_userspace
#else
#define resume_userspace_sig	resume_userspace
#endif

/*
  * User gs save/restore
  *
  * %gs is used for userland TLS and kernel only uses it 
for stack
  * canary which is required to be at %gs:20 by gcc.  Read 
the comment
  * at the top of stackprotector.h for more info.
  *
  * Local labels 98 and 99 are used.
  */
#ifdef CONFIG_X86_32_LAZY_GS

  /* unfortunately push/pop can't be no-op */
.macro PUSH_GS
	pushl_cfi $0
.endm
.macro POP_GS pop=0
	addl $(4 + \pop), %esp
	CFI_ADJUST_CFA_OFFSET -(4 + \pop)
.endm
.macro POP_GS_EX
.endm

  /* all the rest are no-op */
.macro PTGS_TO_GS
.endm
.macro PTGS_TO_GS_EX
.endm
.macro GS_TO_REG reg
.endm
.macro REG_TO_PTGS reg
.endm
.macro SET_KERNEL_GS reg
.endm

#else	/* CONFIG_X86_32_LAZY_GS */

.macro PUSH_GS
	pushl_cfi %gs
	/*CFI_REL_OFFSET gs, 0*/
.endm

.macro POP_GS pop=0
98:	popl_cfi %gs
	/*CFI_RESTORE gs*/
   .if \pop <> 0
	add $\pop, %esp
	CFI_ADJUST_CFA_OFFSET -\pop
   .endif
.endm
.macro POP_GS_EX
.pushsection .fixup, "ax"
99:	movl $0, (%esp)
	jmp 98b
.section __ex_table, "a"
	.align 4
	.long 98b, 99b
.popsection
.endm

.macro PTGS_TO_GS
98:	mov PT_GS(%esp), %gs
.endm
.macro PTGS_TO_GS_EX
.pushsection .fixup, "ax"
99:	movl $0, PT_GS(%esp)
	jmp 98b
.section __ex_table, "a"
	.align 4
	.long 98b, 99b
.popsection
.endm

.macro GS_TO_REG reg
	movl %gs, \reg
	/*CFI_REGISTER gs, \reg*/
.endm
.macro REG_TO_PTGS reg
	movl \reg, PT_GS(%esp)
	/*CFI_REL_OFFSET gs, PT_GS*/
.endm
.macro SET_KERNEL_GS reg
	movl $(__KERNEL_STACK_CANARY), \reg
	movl \reg, %gs
.endm

#endif	/* CONFIG_X86_32_LAZY_GS */

.macro SAVE_ALL
	cld
	PUSH_GS
	pushl_cfi %fs
	/*CFI_REL_OFFSET fs, 0;*/
	pushl_cfi %es
	/*CFI_REL_OFFSET es, 0;*/
	pushl_cfi %ds
	/*CFI_REL_OFFSET ds, 0;*/
	pushl_cfi %eax
	CFI_REL_OFFSET eax, 0
	pushl_cfi %ebp
	CFI_REL_OFFSET ebp, 0
	pushl_cfi %edi
	CFI_REL_OFFSET edi, 0
	pushl_cfi %esi
	CFI_REL_OFFSET esi, 0
	pushl_cfi %edx
	CFI_REL_OFFSET edx, 0
	pushl_cfi %ecx
	CFI_REL_OFFSET ecx, 0
	pushl_cfi %ebx
	CFI_REL_OFFSET ebx, 0
	movl $(__USER_DS), %edx
	movl %edx, %ds
	movl %edx, %es
	movl $(__KERNEL_PERCPU), %edx
	movl %edx, %fs
	SET_KERNEL_GS %edx
.endm

.macro RESTORE_INT_REGS
	popl_cfi %ebx
	CFI_RESTORE ebx
	popl_cfi %ecx
	CFI_RESTORE ecx
	popl_cfi %edx
	CFI_RESTORE edx
	popl_cfi %esi
	CFI_RESTORE esi
	popl_cfi %edi
	CFI_RESTORE edi
	popl_cfi %ebp
	CFI_RESTORE ebp
	popl_cfi %eax
	CFI_RESTORE eax
.endm

.macro RESTORE_REGS pop=0
	RESTORE_INT_REGS
1:	popl_cfi %ds
	/*CFI_RESTORE ds;*/
2:	popl_cfi %es
	/*CFI_RESTORE es;*/
3:	popl_cfi %fs
	/*CFI_RESTORE fs;*/
	POP_GS \pop
.pushsection .fixup, "ax"
4:	movl $0, (%esp)
	jmp 1b
5:	movl $0, (%esp)
	jmp 2b
6:	movl $0, (%esp)
	jmp 3b
.section __ex_table, "a"
	.align 4
	.long 1b, 4b
	.long 2b, 5b
	.long 3b, 6b
.popsection
	POP_GS_EX
.endm

.macro RING0_INT_FRAME
	CFI_STARTPROC simple
	CFI_SIGNAL_FRAME
	CFI_DEF_CFA esp, 3*4
	/*CFI_OFFSET cs, -2*4;*/
	CFI_OFFSET eip, -3*4
.endm

.macro RING0_EC_FRAME
	CFI_STARTPROC simple
	CFI_SIGNAL_FRAME
	CFI_DEF_CFA esp, 4*4
	/*CFI_OFFSET cs, -2*4;*/
	CFI_OFFSET eip, -3*4
.endm

.macro RING0_PTREGS_FRAME
	CFI_STARTPROC simple
	CFI_SIGNAL_FRAME
	CFI_DEF_CFA esp, PT_OLDESP-PT_EBX
	/*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/
	CFI_OFFSET eip, PT_EIP-PT_OLDESP
	/*CFI_OFFSET es, PT_ES-PT_OLDESP;*/
	/*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/
	CFI_OFFSET eax, PT_EAX-PT_OLDESP
	CFI_OFFSET ebp, PT_EBP-PT_OLDESP
	CFI_OFFSET edi, PT_EDI-PT_OLDESP
	CFI_OFFSET esi, PT_ESI-PT_OLDESP
	CFI_OFFSET edx, PT_EDX-PT_OLDESP
	CFI_OFFSET ecx, PT_ECX-PT_OLDESP
	CFI_OFFSET ebx, PT_EBX-PT_OLDESP
.endm

ENTRY(ret_from_fork)
	CFI_STARTPROC
	pushl_cfi %eax
	call schedule_tail
	GET_THREAD_INFO(%ebp)
	popl_cfi %eax
	pushl_cfi $0x0202		# Reset kernel eflags
	popfl_cfi
	jmp syscall_exit
	CFI_ENDPROC
END(ret_from_fork)

/*
  * Interrupt exit functions should be protected against 
kprobes
  */
	.pushsection .kprobes.text, "ax"
/*
  * Return to user mode is not as complex as all this 
looks,
  * but we want the default path for a system call return 
to
  * go as quickly as possible which is why some of this is
  * less clear than it otherwise should be.
  */

	# userspace resumption stub bypassing syscall exit 
tracing
	ALIGN
	RING0_PTREGS_FRAME
ret_from_exception:
	preempt_stop(CLBR_ANY)
ret_from_intr:
	GET_THREAD_INFO(%ebp)
check_userspace:
	movl PT_EFLAGS(%esp), %eax	# mix EFLAGS and CS
	movb PT_CS(%esp), %al
	andl $(X86_EFLAGS_VM | SEGMENT_RPL_MASK), %eax
	cmpl $USER_RPL, %eax
	jb resume_kernel		# not returning to v8086 or userspace

ENTRY(resume_userspace)
	LOCKDEP_SYS_EXIT
  	DISABLE_INTERRUPTS(CLBR_ANY)	# make sure we don't miss 
an interrupt
					# setting need_resched or sigpending
					# between sampling and the iret
	TRACE_IRQS_OFF
	movl TI_flags(%ebp), %ecx
	andl $_TIF_WORK_MASK, %ecx	# is there any work to be done 
on
					# int/exception return?
	jne work_pending
	jmp restore_all
END(ret_from_exception)

#ifdef CONFIG_PREEMPT
ENTRY(resume_kernel)
	DISABLE_INTERRUPTS(CLBR_ANY)
	cmpl $0,TI_preempt_count(%ebp)	# non-zero preempt_count ?
	jnz restore_all
need_resched:
	movl TI_flags(%ebp), %ecx	# need_resched set ?
	testb $_TIF_NEED_RESCHED, %cl
	jz restore_all
	testl $X86_EFLAGS_IF,PT_EFLAGS(%esp)	# interrupts off 
(exception path) ?
	jz restore_all
	call preempt_schedule_irq
	jmp need_resched
END(resume_kernel)
#endif
	CFI_ENDPROC
/*
  * End of kprobes section
  */
	.popsection

/* SYSENTER_RETURN points to after the "sysenter" 
instruction in
    the vsyscall page.  See vsyscall-sysentry.S, which 
defines the symbol.  */

	# sysenter call handler stub
ENTRY(ia32_sysenter_target)
	CFI_STARTPROC simple
	CFI_SIGNAL_FRAME
	CFI_DEF_CFA esp, 0
	CFI_REGISTER esp, ebp
	movl TSS_sysenter_sp0(%esp),%esp
sysenter_past_esp:
	/*
	 * Interrupts are disabled here, but we can't trace it 
until
	 * enough kernel state to call TRACE_IRQS_OFF can be 
called - but
	 * we immediately enable interrupts at that point anyway.
	 */
	pushl_cfi $__USER_DS
	/*CFI_REL_OFFSET ss, 0*/
	pushl_cfi %ebp
	CFI_REL_OFFSET esp, 0
	pushfl_cfi
	orl $X86_EFLAGS_IF, (%esp)
	pushl_cfi $__USER_CS
	/*CFI_REL_OFFSET cs, 0*/
	/*
	 * Push current_thread_info()->sysenter_return to the 
stack.
	 * A tiny bit of offset fixup is necessary - 4*4 means 
the 4 words
	 * pushed above; +8 corresponds to copy_thread's esp0 
setting.
	 */
	pushl_cfi ((TI_sysenter_return)-THREAD_SIZE+8+4*4)(%esp)
	CFI_REL_OFFSET eip, 0

	pushl_cfi %eax
	SAVE_ALL
	ENABLE_INTERRUPTS(CLBR_NONE)

/*
  * Load the potential sixth argument from user stack.
  * Careful about security.
  */
	cmpl $__PAGE_OFFSET-3,%ebp
	jae syscall_fault
1:	movl (%ebp),%ebp
	movl %ebp,PT_EBP(%esp)
.section __ex_table,"a"
	.align 4
	.long 1b,syscall_fault
.previous

	GET_THREAD_INFO(%ebp)

	testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp)
	jnz sysenter_audit
sysenter_do_call:
	cmpl $(nr_syscalls), %eax
	jae syscall_badsys
	call *sys_call_table(,%eax,4)
	movl %eax,PT_EAX(%esp)
	LOCKDEP_SYS_EXIT
	DISABLE_INTERRUPTS(CLBR_ANY)
	TRACE_IRQS_OFF
	movl TI_flags(%ebp), %ecx
	testl $_TIF_ALLWORK_MASK, %ecx
	jne sysexit_audit
sysenter_exit:
/* if something modifies registers it must also disable 
sysexit */
	movl PT_EIP(%esp), %edx
	movl PT_OLDESP(%esp), %ecx
	xorl %ebp,%ebp
	TRACE_IRQS_ON
1:	mov  PT_FS(%esp), %fs
	PTGS_TO_GS
	ENABLE_INTERRUPTS_SYSEXIT

#ifdef CONFIG_AUDITSYSCALL
sysenter_audit:
	testl $(_TIF_WORK_SYSCALL_ENTRY & 
~_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
	jnz syscall_trace_entry
	addl $4,%esp
	CFI_ADJUST_CFA_OFFSET -4
	/* %esi already in 8(%esp)	   6th arg: 4th syscall arg */
	/* %edx already in 4(%esp)	   5th arg: 3rd syscall arg */
	/* %ecx already in 0(%esp)	   4th arg: 2nd syscall arg */
	movl %ebx,%ecx			/* 3rd arg: 1st syscall arg */
	movl %eax,%edx			/* 2nd arg: syscall number */
	movl $AUDIT_ARCH_I386,%eax	/* 1st arg: audit arch */
	call audit_syscall_entry
	pushl_cfi %ebx
	movl PT_EAX(%esp),%eax		/* reload syscall number */
	jmp sysenter_do_call

sysexit_audit:
	testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx
	jne syscall_exit_work
	TRACE_IRQS_ON
	ENABLE_INTERRUPTS(CLBR_ANY)
	movl %eax,%edx		/* second arg, syscall return value */
	cmpl $0,%eax		/* is it < 0? */
	setl %al		/* 1 if so, 0 if not */
	movzbl %al,%eax		/* zero-extend that */
	inc %eax /* first arg, 0->1(AUDITSC_SUCCESS), 
1->2(AUDITSC_FAILURE) */
	call audit_syscall_exit
	DISABLE_INTERRUPTS(CLBR_ANY)
	TRACE_IRQS_OFF
	movl TI_flags(%ebp), %ecx
	testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %ecx
	jne syscall_exit_work
	movl PT_EAX(%esp),%eax	/* reload syscall return value */
	jmp sysenter_exit
#endif

	CFI_ENDPROC
.pushsection .fixup,"ax"
2:	movl $0,PT_FS(%esp)
	jmp 1b
.section __ex_table,"a"
	.align 4
	.long 1b,2b
.popsection
	PTGS_TO_GS_EX
ENDPROC(ia32_sysenter_target)

/*
  * syscall stub including irq exit should be protected 
against kprobes
  */
	.pushsection .kprobes.text, "ax"
	# system call handler stub
ENTRY(system_call)
	RING0_INT_FRAME			# can't unwind into user space anyway
	pushl_cfi %eax			# save orig_eax
	SAVE_ALL
	GET_THREAD_INFO(%ebp)
					# system call tracing in operation / emulation
	testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp)
	jnz syscall_trace_entry
	cmpl $(nr_syscalls), %eax
	jae syscall_badsys
syscall_call:
	call *sys_call_table(,%eax,4)
	movl %eax,PT_EAX(%esp)		# store the return value
syscall_exit:
	LOCKDEP_SYS_EXIT
	DISABLE_INTERRUPTS(CLBR_ANY)	# make sure we don't miss an 
interrupt
					# setting need_resched or sigpending
					# between sampling and the iret
	TRACE_IRQS_OFF
	movl TI_flags(%ebp), %ecx
	testl $_TIF_ALLWORK_MASK, %ecx	# current->work
	jne syscall_exit_work

restore_all:
	TRACE_IRQS_IRET
restore_all_notrace:
	movl PT_EFLAGS(%esp), %eax	# mix EFLAGS, SS and CS
	# Warning: PT_OLDSS(%esp) contains the wrong/random 
values if we
	# are returning to the kernel.
	# See comments in process.c:copy_thread() for details.
	movb PT_OLDSS(%esp), %ah
	movb PT_CS(%esp), %al
	andl $(X86_EFLAGS_VM | (SEGMENT_TI_MASK << 8) | 
SEGMENT_RPL_MASK), %eax
	cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
	CFI_REMEMBER_STATE
	je ldt_ss			# returning to user-space with LDT SS
restore_nocheck:
	RESTORE_REGS 4			# skip orig_eax/error_code
irq_return:
	INTERRUPT_RETURN
.section .fixup,"ax"
ENTRY(iret_exc)
	pushl $0			# no error code
	pushl $do_iret_error
	jmp error_code
.previous
.section __ex_table,"a"
	.align 4
	.long irq_return,iret_exc
.previous

	CFI_RESTORE_STATE
ldt_ss:
	larl PT_OLDSS(%esp), %eax
	jnz restore_nocheck
	testl $0x00400000, %eax		# returning to 32bit stack?
	jnz restore_nocheck		# allright, normal return

#ifdef CONFIG_PARAVIRT
	/*
	 * The kernel can't run on a non-flat stack if paravirt 
mode
	 * is active.  Rather than try to fixup the high bits of
	 * ESP, bypass this code entirely.  This may break DOSemu
	 * and/or Wine support in a paravirt VM, although the 
option
	 * is still available to implement the setting of the 
high
	 * 16-bits in the INTERRUPT_RETURN paravirt-op.
	 */
	cmpl $0, pv_info+PARAVIRT_enabled
	jne restore_nocheck
#endif

/*
  * Setup and switch to ESPFIX stack
  *
  * We're returning to userspace with a 16 bit stack. The 
CPU will not
  * restore the high word of ESP for us on executing 
iret... This is an
  * "official" bug of all the x86-compatible CPUs, which 
we can work
  * around to make dosemu and wine happy. We do this by 
preloading the
  * high word of ESP with the high word of the userspace 
ESP while
  * compensating for the offset by changing to the ESPFIX 
segment with
  * a base address that matches for the difference.
  */
#define GDT_ESPFIX_SS PER_CPU_VAR(gdt_page) + 
(GDT_ENTRY_ESPFIX_SS * 8)
	mov %esp, %edx			/* load kernel esp */
	mov PT_OLDESP(%esp), %eax	/* load userspace esp */
	mov %dx, %ax			/* eax: new kernel esp */
	sub %eax, %edx			/* offset (low word is 0) */
	shr $16, %edx
	mov %dl, GDT_ESPFIX_SS + 4 /* bits 16..23 */
	mov %dh, GDT_ESPFIX_SS + 7 /* bits 24..31 */
	pushl_cfi $__ESPFIX_SS
	pushl_cfi %eax			/* new kernel esp */
	/* Disable interrupts, but do not irqtrace this section: 
we
	 * will soon execute iret and the tracer was already set 
to
	 * the irqstate after the iret */
	DISABLE_INTERRUPTS(CLBR_EAX)
	lss (%esp), %esp		/* switch to espfix segment */
	CFI_ADJUST_CFA_OFFSET -8
	jmp restore_nocheck
	CFI_ENDPROC
ENDPROC(system_call)

	# perform work that needs to be done immediately before 
resumption
	ALIGN
	RING0_PTREGS_FRAME		# can't unwind into user space anyway
work_pending:
	testb $_TIF_NEED_RESCHED, %cl
	jz work_notifysig
work_resched:
	call schedule
	LOCKDEP_SYS_EXIT
	DISABLE_INTERRUPTS(CLBR_ANY)	# make sure we don't miss an 
interrupt
					# setting need_resched or sigpending
					# between sampling and the iret
	TRACE_IRQS_OFF
	movl TI_flags(%ebp), %ecx
	andl $_TIF_WORK_MASK, %ecx	# is there any work to be done 
other
					# than syscall tracing?
	jz restore_all
	testb $_TIF_NEED_RESCHED, %cl
	jnz work_resched

work_notifysig:				# deal with pending signals and
					# notify-resume requests
#ifdef CONFIG_VM86
	testl $X86_EFLAGS_VM, PT_EFLAGS(%esp)
	movl %esp, %eax
	jne work_notifysig_v86		# returning to kernel-space or
					# vm86-space
	xorl %edx, %edx
	call do_notify_resume
	jmp resume_userspace_sig

	ALIGN
work_notifysig_v86:
	pushl_cfi %ecx			# save ti_flags for do_notify_resume
	call save_v86_state		# %eax contains pt_regs pointer
	popl_cfi %ecx
	movl %eax, %esp
#else
	movl %esp, %eax
#endif
	xorl %edx, %edx
	call do_notify_resume
	jmp resume_userspace_sig
END(work_pending)

	# perform syscall exit tracing
	ALIGN
syscall_trace_entry:
	movl $-ENOSYS,PT_EAX(%esp)
	movl %esp, %eax
	call syscall_trace_enter
	/* What it returned is what we'll actually use.  */
	cmpl $(nr_syscalls), %eax
	jnae syscall_call
	jmp syscall_exit
END(syscall_trace_entry)

	# perform syscall exit tracing
	ALIGN
syscall_exit_work:
	testl $_TIF_WORK_SYSCALL_EXIT, %ecx
	jz work_pending
	TRACE_IRQS_ON
	ENABLE_INTERRUPTS(CLBR_ANY)	# could let 
syscall_trace_leave() call
					# schedule() instead
	movl %esp, %eax
	call syscall_trace_leave
	jmp resume_userspace
END(syscall_exit_work)
	CFI_ENDPROC

	RING0_INT_FRAME			# can't unwind into user space anyway
syscall_fault:
	GET_THREAD_INFO(%ebp)
	movl $-EFAULT,PT_EAX(%esp)
	jmp resume_userspace
END(syscall_fault)

syscall_badsys:
	movl $-ENOSYS,PT_EAX(%esp)
	jmp resume_userspace
END(syscall_badsys)
	CFI_ENDPROC
/*
  * End of kprobes section
  */
	.popsection

/*
  * System calls that need a pt_regs pointer.
  */
#define PTREGSCALL0(name) \
	ALIGN; \
ptregs_##name: \
	leal 4(%esp),%eax; \
	jmp sys_##name;

#define PTREGSCALL1(name) \
	ALIGN; \
ptregs_##name: \
	leal 4(%esp),%edx; \
	movl (PT_EBX+4)(%esp),%eax; \
	jmp sys_##name;

#define PTREGSCALL2(name) \
	ALIGN; \
ptregs_##name: \
	leal 4(%esp),%ecx; \
	movl (PT_ECX+4)(%esp),%edx; \
	movl (PT_EBX+4)(%esp),%eax; \
	jmp sys_##name;

#define PTREGSCALL3(name) \
	ALIGN; \
ptregs_##name: \
	CFI_STARTPROC; \
	leal 4(%esp),%eax; \
	pushl_cfi %eax; \
	movl PT_EDX(%eax),%ecx; \
	movl PT_ECX(%eax),%edx; \
	movl PT_EBX(%eax),%eax; \
	call sys_##name; \
	addl $4,%esp; \
	CFI_ADJUST_CFA_OFFSET -4; \
	ret; \
	CFI_ENDPROC; \
ENDPROC(ptregs_##name)

PTREGSCALL1(iopl)
PTREGSCALL0(fork)
PTREGSCALL0(vfork)
PTREGSCALL3(execve)
PTREGSCALL2(sigaltstack)
PTREGSCALL0(sigreturn)
PTREGSCALL0(rt_sigreturn)
PTREGSCALL2(vm86)
PTREGSCALL1(vm86old)

/* Clone is an oddball.  The 4th arg is in %edi */
	ALIGN;
ptregs_clone:
	CFI_STARTPROC
	leal 4(%esp),%eax
	pushl_cfi %eax
	pushl_cfi PT_EDI(%eax)
	movl PT_EDX(%eax),%ecx
	movl PT_ECX(%eax),%edx
	movl PT_EBX(%eax),%eax
	call sys_clone
	addl $8,%esp
	CFI_ADJUST_CFA_OFFSET -8
	ret
	CFI_ENDPROC
ENDPROC(ptregs_clone)

.macro FIXUP_ESPFIX_STACK
/*
  * Switch back for ESPFIX stack to the normal zerobased 
stack
  *
  * We can't call C functions using the ESPFIX stack. This 
code reads
  * the high word of the segment base from the GDT and 
swiches to the
  * normal stack and adjusts ESP with the matching offset.
  */
	/* fixup the stack */
	mov GDT_ESPFIX_SS + 4, %al /* bits 16..23 */
	mov GDT_ESPFIX_SS + 7, %ah /* bits 24..31 */
	shl $16, %eax
	addl %esp, %eax			/* the adjusted stack pointer */
	pushl_cfi $__KERNEL_DS
	pushl_cfi %eax
	lss (%esp), %esp		/* switch to the normal stack segment 
*/
	CFI_ADJUST_CFA_OFFSET -8
.endm
.macro UNWIND_ESPFIX_STACK
	movl %ss, %eax
	/* see if on espfix stack */
	cmpw $__ESPFIX_SS, %ax
	jne 27f
	movl $__KERNEL_DS, %eax
	movl %eax, %ds
	movl %eax, %es
	/* switch to normal stack */
	FIXUP_ESPFIX_STACK
27:
.endm

/*
  * Build the entry stubs and pointer table with some 
assembler magic.
  * We pack 7 stubs into a single 32-byte chunk, which 
will fit in a
  * single cache line on all modern x86 implementations.
  */
.section .init.rodata,"a"
ENTRY(interrupt)
.section .entry.text, "ax"
	.p2align 5
	.p2align CONFIG_X86_L1_CACHE_SHIFT
ENTRY(irq_entries_start)
	RING0_INT_FRAME
vector=FIRST_EXTERNAL_VECTOR
.rept (NR_VECTORS-FIRST_EXTERNAL_VECTOR+6)/7
	.balign 32
   .rept	7
     .if vector < NR_VECTORS
       .if vector <> FIRST_EXTERNAL_VECTOR
	CFI_ADJUST_CFA_OFFSET -4
       .endif
1:	pushl_cfi $(~vector+0x80)	/* Note: always in signed 
byte range */
       .if ((vector-FIRST_EXTERNAL_VECTOR)%7) <> 6
	jmp 2f
       .endif
       .previous
	.long 1b
       .section .entry.text, "ax"
vector=vector+1
     .endif
   .endr
2:	jmp common_interrupt
.endr
END(irq_entries_start)

.previous
END(interrupt)
.previous

/*
  * the CPU automatically disables interrupts when 
executing an IRQ vector,
  * so IRQ-flags tracing has to follow that:
  */
	.p2align CONFIG_X86_L1_CACHE_SHIFT
common_interrupt:
	addl $-0x80,(%esp)	/* Adjust vector into the [-256,-1] 
range */
	SAVE_ALL
	TRACE_IRQS_OFF
	movl %esp,%eax
	call do_IRQ
	jmp ret_from_intr
ENDPROC(common_interrupt)
	CFI_ENDPROC

/*
  *  Irq entries should be protected against kprobes
  */
	.pushsection .kprobes.text, "ax"
#define BUILD_INTERRUPT3(name, nr, fn)	\
ENTRY(name)				\
	RING0_INT_FRAME;		\
	pushl_cfi $~(nr);		\
	SAVE_ALL;			\
	TRACE_IRQS_OFF			\
	movl %esp,%eax;			\
	call fn;			\
	jmp ret_from_intr;		\
	CFI_ENDPROC;			\
ENDPROC(name)

#define BUILD_INTERRUPT(name, nr)	BUILD_INTERRUPT3(name, 
nr, smp_##name)

/* The include is where all of the SMP etc. interrupts 
come from */
#include <asm/entry_arch.h>

ENTRY(coprocessor_error)
	RING0_INT_FRAME
	pushl_cfi $0
	pushl_cfi $do_coprocessor_error
	jmp error_code
	CFI_ENDPROC
END(coprocessor_error)

ENTRY(simd_coprocessor_error)
	RING0_INT_FRAME
	pushl_cfi $0
#ifdef CONFIG_X86_INVD_BUG
	/* AMD 486 bug: invd from userspace calls exception 19 
instead of #GP */
661:	pushl_cfi $do_general_protection
662:
.section .altinstructions,"a"
  altinstruction_entry 661b, 663f, X86_FEATURE_XMM, 
662b-661b, 664f-663f
.previous
.section .altinstr_replacement,"ax"
663:	pushl $do_simd_coprocessor_error
664:
.previous
#else
	pushl_cfi $do_simd_coprocessor_error
#endif
	jmp error_code
	CFI_ENDPROC
END(simd_coprocessor_error)

ENTRY(device_not_available)
	RING0_INT_FRAME
	pushl_cfi $-1			# mark this as an int
	pushl_cfi $do_device_not_available
	jmp error_code
	CFI_ENDPROC
END(device_not_available)

#ifdef CONFIG_PARAVIRT
ENTRY(native_iret)
	iret
.section __ex_table,"a"
	.align 4
	.long native_iret, iret_exc
.previous
END(native_iret)

ENTRY(native_irq_enable_sysexit)
	sti
	sysexit
END(native_irq_enable_sysexit)
#endif

ENTRY(overflow)
	RING0_INT_FRAME
	pushl_cfi $0
	pushl_cfi $do_overflow
	jmp error_code
	CFI_ENDPROC
END(overflow)

ENTRY(bounds)
	RING0_INT_FRAME
	pushl_cfi $0
	pushl_cfi $do_bounds
	jmp error_code
	CFI_ENDPROC
END(bounds)

ENTRY(invalid_op)
	RING0_INT_FRAME
	pushl_cfi $0
	pushl_cfi $do_invalid_op
	jmp error_code
	CFI_ENDPROC
END(invalid_op)

ENTRY(coprocessor_segment_overrun)
	RING0_INT_FRAME
	pushl_cfi $0
	pushl_cfi $do_coprocessor_segment_overrun
	jmp error_code
	CFI_ENDPROC
END(coprocessor_segment_overrun)

ENTRY(invalid_TSS)
	RING0_EC_FRAME
	pushl_cfi $do_invalid_TSS
	jmp error_code
	CFI_ENDPROC
END(invalid_TSS)

ENTRY(segment_not_present)
	RING0_EC_FRAME
	pushl_cfi $do_segment_not_present
	jmp error_code
	CFI_ENDPROC
END(segment_not_present)

ENTRY(stack_segment)
	RING0_EC_FRAME
	pushl_cfi $do_stack_segment
	jmp error_code
	CFI_ENDPROC
END(stack_segment)

ENTRY(alignment_check)
	RING0_EC_FRAME
	pushl_cfi $do_alignment_check
	jmp error_code
	CFI_ENDPROC
END(alignment_check)

ENTRY(divide_error)
	RING0_INT_FRAME
	pushl_cfi $0			# no error code
	pushl_cfi $do_divide_error
	jmp error_code
	CFI_ENDPROC
END(divide_error)

#ifdef CONFIG_X86_MCE
ENTRY(machine_check)
	RING0_INT_FRAME
	pushl_cfi $0
	pushl_cfi machine_check_vector
	jmp error_code
	CFI_ENDPROC
END(machine_check)
#endif

ENTRY(spurious_interrupt_bug)
	RING0_INT_FRAME
	pushl_cfi $0
	pushl_cfi $do_spurious_interrupt_bug
	jmp error_code
	CFI_ENDPROC
END(spurious_interrupt_bug)
/*
  * End of kprobes section
  */
	.popsection

ENTRY(kernel_thread_helper)
	pushl $0		# fake return address for unwinder
	CFI_STARTPROC
	movl %edi,%eax
	call *%esi
	call do_exit
	ud2			# padding for call trace
	CFI_ENDPROC
ENDPROC(kernel_thread_helper)

#ifdef CONFIG_XEN
/* Xen doesn't set %esp to be precisely what the normal 
sysenter
    entrypoint expects, so fix it up before using the 
normal path. */
ENTRY(xen_sysenter_target)
	RING0_INT_FRAME
	addl $5*4, %esp		/* remove xen-provided frame */
	CFI_ADJUST_CFA_OFFSET -5*4
	jmp sysenter_past_esp
	CFI_ENDPROC

ENTRY(xen_hypervisor_callback)
	CFI_STARTPROC
	pushl_cfi $0
	SAVE_ALL
	TRACE_IRQS_OFF

	/* Check to see if we got the event in the critical
	   region in xen_iret_direct, after we've reenabled
	   events and checked for pending events.  This simulates
	   iret instruction's behaviour where it delivers a
	   pending interrupt when enabling interrupts. */
	movl PT_EIP(%esp),%eax
	cmpl $xen_iret_start_crit,%eax
	jb   1f
	cmpl $xen_iret_end_crit,%eax
	jae  1f

	jmp  xen_iret_crit_fixup

ENTRY(xen_do_upcall)
1:	mov %esp, %eax
	call xen_evtchn_do_upcall
	jmp  ret_from_intr
	CFI_ENDPROC
ENDPROC(xen_hypervisor_callback)

# Hypervisor uses this for application faults while it 
executes.
# We get here for two reasons:
#  1. Fault while reloading DS, ES, FS or GS
#  2. Fault while executing IRET
# Category 1 we fix up by reattempting the load, and 
zeroing the segment
# register if the load fails.
# Category 2 we fix up by jumping to do_iret_error. We 
cannot use the
# normal Linux return path in this case because if we use 
the IRET hypercall
# to pop the stack frame we end up in an infinite loop of 
failsafe callbacks.
# We distinguish between categories by maintaining a 
status value in EAX.
ENTRY(xen_failsafe_callback)
	CFI_STARTPROC
	pushl_cfi %eax
	movl $1,%eax
1:	mov 4(%esp),%ds
2:	mov 8(%esp),%es
3:	mov 12(%esp),%fs
4:	mov 16(%esp),%gs
	testl %eax,%eax
	popl_cfi %eax
	lea 16(%esp),%esp
	CFI_ADJUST_CFA_OFFSET -16
	jz 5f
	addl $16,%esp
	jmp iret_exc		# EAX != 0 => Category 2 (Bad IRET)
5:	pushl_cfi $0		# EAX == 0 => Category 1 (Bad segment)
	SAVE_ALL
	jmp ret_from_exception
	CFI_ENDPROC

.section .fixup,"ax"
6:	xorl %eax,%eax
	movl %eax,4(%esp)
	jmp 1b
7:	xorl %eax,%eax
	movl %eax,8(%esp)
	jmp 2b
8:	xorl %eax,%eax
	movl %eax,12(%esp)
	jmp 3b
9:	xorl %eax,%eax
	movl %eax,16(%esp)
	jmp 4b
.previous
.section __ex_table,"a"
	.align 4
	.long 1b,6b
	.long 2b,7b
	.long 3b,8b
	.long 4b,9b
.previous
ENDPROC(xen_failsafe_callback)

BUILD_INTERRUPT3(xen_hvm_callback_vector, 
XEN_HVM_EVTCHN_CALLBACK,
		xen_evtchn_do_upcall)

#endif	/* CONFIG_XEN */

#ifdef CONFIG_FUNCTION_TRACER
#ifdef CONFIG_DYNAMIC_FTRACE

ENTRY(mcount)
	ret
END(mcount)

ENTRY(ftrace_caller)
	cmpl $0, function_trace_stop
	jne  ftrace_stub

	pushl %eax
	pushl %ecx
	pushl %edx
	movl 0xc(%esp), %eax
	movl 0x4(%ebp), %edx
	subl $MCOUNT_INSN_SIZE, %eax

.globl ftrace_call
ftrace_call:
	call ftrace_stub

	popl %edx
	popl %ecx
	popl %eax
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl ftrace_graph_call
ftrace_graph_call:
	jmp ftrace_stub
#endif

.globl ftrace_stub
ftrace_stub:
	ret
END(ftrace_caller)

#else /* ! CONFIG_DYNAMIC_FTRACE */

ENTRY(mcount)
	cmpl $0, function_trace_stop
	jne  ftrace_stub

	cmpl $ftrace_stub, ftrace_trace_function
	jnz trace
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
	cmpl $ftrace_stub, ftrace_graph_return
	jnz ftrace_graph_caller

	cmpl $ftrace_graph_entry_stub, ftrace_graph_entry
	jnz ftrace_graph_caller
#endif
.globl ftrace_stub
ftrace_stub:
	ret

	/* taken from glibc */
trace:
	pushl %eax
	pushl %ecx
	pushl %edx
	movl 0xc(%esp), %eax
	movl 0x4(%ebp), %edx
	subl $MCOUNT_INSN_SIZE, %eax

	call *ftrace_trace_function

	popl %edx
	popl %ecx
	popl %eax
	jmp ftrace_stub
END(mcount)
#endif /* CONFIG_DYNAMIC_FTRACE */
#endif /* CONFIG_FUNCTION_TRACER */

#ifdef CONFIG_FUNCTION_GRAPH_TRACER
ENTRY(ftrace_graph_caller)
	cmpl $0, function_trace_stop
	jne ftrace_stub

	pushl %eax
	pushl %ecx
	pushl %edx
	movl 0xc(%esp), %edx
	lea 0x4(%ebp), %eax
	movl (%ebp), %ecx
	subl $MCOUNT_INSN_SIZE, %edx
	call prepare_ftrace_return
	popl %edx
	popl %ecx
	popl %eax
	ret
END(ftrace_graph_caller)

.globl return_to_handler
return_to_handler:
	pushl %eax
	pushl %edx
	movl %ebp, %eax
	call ftrace_return_to_handler
	movl %eax, %ecx
	popl %edx
	popl %eax
	jmp *%ecx
#endif

.section .rodata,"a"
#include "syscall_table_32.S"

syscall_table_size=(.-sys_call_table)

/*
  * Some functions should be protected against kprobes
  */
	.pushsection .kprobes.text, "ax"

ENTRY(page_fault)
	RING0_EC_FRAME
	pushl_cfi $do_page_fault
	ALIGN
error_code:
	/* the function address is in %gs's slot on the stack */
	pushl_cfi %fs
	/*CFI_REL_OFFSET fs, 0*/
	pushl_cfi %es
	/*CFI_REL_OFFSET es, 0*/
	pushl_cfi %ds
	/*CFI_REL_OFFSET ds, 0*/
	pushl_cfi %eax
	CFI_REL_OFFSET eax, 0
	pushl_cfi %ebp
	CFI_REL_OFFSET ebp, 0
	pushl_cfi %edi
	CFI_REL_OFFSET edi, 0
	pushl_cfi %esi
	CFI_REL_OFFSET esi, 0
	pushl_cfi %edx
	CFI_REL_OFFSET edx, 0
	pushl_cfi %ecx
	CFI_REL_OFFSET ecx, 0
	pushl_cfi %ebx
	CFI_REL_OFFSET ebx, 0
	cld
	movl $(__KERNEL_PERCPU), %ecx
	movl %ecx, %fs
	UNWIND_ESPFIX_STACK
	GS_TO_REG %ecx
	movl PT_GS(%esp), %edi		# get the function address
	movl PT_ORIG_EAX(%esp), %edx	# get the error code
	movl $-1, PT_ORIG_EAX(%esp)	# no syscall to restart
	REG_TO_PTGS %ecx
	SET_KERNEL_GS %ecx
	movl $(__USER_DS), %ecx
	movl %ecx, %ds
	movl %ecx, %es
	TRACE_IRQS_OFF
	movl %esp,%eax			# pt_regs pointer
	call *%edi
	jmp ret_from_exception
	CFI_ENDPROC
END(page_fault)

/*
  * Debug traps and NMI can happen at the one SYSENTER 
instruction
  * that sets up the real kernel stack. Check here, since 
we can't
  * allow the wrong stack to be used.
  *
  * "TSS_sysenter_sp0+12" is because the NMI/debug handler 
will have
  * already pushed 3 words if it hits on the sysenter 
instruction:
  * eflags, cs and eip.
  *
  * We just load the right stack, and push the three 
(known) values
  * by hand onto the new stack - while updating the return 
eip past
  * the instruction that would have done it for sysenter.
  */
.macro FIX_STACK offset ok label
	cmpw $__KERNEL_CS, 4(%esp)
	jne \ok
\label:
	movl TSS_sysenter_sp0 + \offset(%esp), %esp
	CFI_DEF_CFA esp, 0
	CFI_UNDEFINED eip
	pushfl_cfi
	pushl_cfi $__KERNEL_CS
	pushl_cfi $sysenter_past_esp
	CFI_REL_OFFSET eip, 0
.endm

ENTRY(debug)
	RING0_INT_FRAME
	cmpl $ia32_sysenter_target,(%esp)
	jne debug_stack_correct
	FIX_STACK 12, debug_stack_correct, debug_esp_fix_insn
debug_stack_correct:
	pushl_cfi $-1			# mark this as an int
	SAVE_ALL
	TRACE_IRQS_OFF
	xorl %edx,%edx			# error code 0
	movl %esp,%eax			# pt_regs pointer
	call do_debug
	jmp ret_from_exception
	CFI_ENDPROC
END(debug)

/*
  * NMI is doubly nasty. It can happen _while_ we're 
handling
  * a debug fault, and the debug fault hasn't yet been 
able to
  * clear up the stack. So we first check whether we got 
 an
  * NMI on the sysenter entry path, but after that we need 
to
  * check whether we got an NMI on the debug path where 
the debug
  * fault happened on the sysenter path.
  */
ENTRY(nmi)
	RING0_INT_FRAME
	pushl_cfi %eax
	movl %ss, %eax
	cmpw $__ESPFIX_SS, %ax
	popl_cfi %eax
	je nmi_espfix_stack
	cmpl $ia32_sysenter_target,(%esp)
	je nmi_stack_fixup
	pushl_cfi %eax
	movl %esp,%eax
	/* Do not access memory above the end of our stack page,
	 * it might not exist.
	 */
	andl $(THREAD_SIZE-1),%eax
	cmpl $(THREAD_SIZE-20),%eax
	popl_cfi %eax
	jae nmi_stack_correct
	cmpl $ia32_sysenter_target,12(%esp)
	je nmi_debug_stack_check
nmi_stack_correct:
	/* We have a RING0_INT_FRAME here */
	pushl_cfi %eax
	SAVE_ALL
	xorl %edx,%edx		# zero error code
	movl %esp,%eax		# pt_regs pointer
	call do_nmi
	jmp restore_all_notrace
	CFI_ENDPROC

nmi_stack_fixup:
	RING0_INT_FRAME
	FIX_STACK 12, nmi_stack_correct, 1
	jmp nmi_stack_correct

nmi_debug_stack_check:
	/* We have a RING0_INT_FRAME here */
	cmpw $__KERNEL_CS,16(%esp)
	jne nmi_stack_correct
	cmpl $debug,(%esp)
	jb nmi_stack_correct
	cmpl $debug_esp_fix_insn,(%esp)
	ja nmi_stack_correct
	FIX_STACK 24, nmi_stack_correct, 1
	jmp nmi_stack_correct

nmi_espfix_stack:
	/* We have a RING0_INT_FRAME here.
	 *
	 * create the pointer to lss back
	 */
	pushl_cfi %ss
	pushl_cfi %esp
	addl $4, (%esp)
	/* copy the iret frame of 12 bytes */
	.rept 3
	pushl_cfi 16(%esp)
	.endr
	pushl_cfi %eax
	SAVE_ALL
	FIXUP_ESPFIX_STACK		# %eax == %esp
	xorl %edx,%edx			# zero error code
	call do_nmi
	RESTORE_REGS
	lss 12+4(%esp), %esp		# back to espfix stack
	CFI_ADJUST_CFA_OFFSET -24
	jmp irq_return
	CFI_ENDPROC
END(nmi)

ENTRY(int3)
	RING0_INT_FRAME
	pushl_cfi $-1			# mark this as an int
	SAVE_ALL
	TRACE_IRQS_OFF
	xorl %edx,%edx		# zero error code
	movl %esp,%eax		# pt_regs pointer
	call do_int3
	jmp ret_from_exception
	CFI_ENDPROC
END(int3)

ENTRY(general_protection)
	RING0_EC_FRAME
	pushl_cfi $do_general_protection
	jmp error_code
	CFI_ENDPROC
END(general_protection)

#ifdef CONFIG_KVM_GUEST
ENTRY(async_page_fault)
	RING0_EC_FRAME
	pushl_cfi $do_async_page_fault
	jmp error_code
	CFI_ENDPROC
END(async_page_fault)
#endif

/*
  * End of kprobes section
  */
	.popsection
---
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