i386: prepare shared kernel/entry.S

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 1112 deletions

diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
deleted file mode 100644
index 290b7bc82da3..000000000000
--- a/arch/i386/kernel/entry.S
+++ /dev/null
@@ -1,1112 +0,0 @@
-/*
- *  linux/arch/i386/entry.S
- *
- *  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) - orig_eax
- *	2C(%esp) - %eip
- *	30(%esp) - %cs
- *	34(%esp) - %eflags
- *	38(%esp) - %oldesp
- *	3C(%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.h>
-#include <asm/desc.h>
-#include <asm/percpu.h>
-#include <asm/dwarf2.h>
-#include "irq_vectors.h"
-
-/*
- * 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)
-
-CF_MASK		= 0x00000001
-TF_MASK		= 0x00000100
-IF_MASK		= 0x00000200
-DF_MASK		= 0x00000400 
-NT_MASK		= 0x00004000
-VM_MASK		= 0x00020000
-
-#ifdef CONFIG_PREEMPT
-#define preempt_stop(clobbers)	DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF
-#else
-#define preempt_stop(clobbers)
-#define resume_kernel		restore_nocheck
-#endif
-
-.macro TRACE_IRQS_IRET
-#ifdef CONFIG_TRACE_IRQFLAGS
-	testl $IF_MASK,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
-
-#define SAVE_ALL \
-	cld; \
-	pushl %fs; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	/*CFI_REL_OFFSET fs, 0;*/\
-	pushl %es; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	/*CFI_REL_OFFSET es, 0;*/\
-	pushl %ds; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	/*CFI_REL_OFFSET ds, 0;*/\
-	pushl %eax; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	CFI_REL_OFFSET eax, 0;\
-	pushl %ebp; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	CFI_REL_OFFSET ebp, 0;\
-	pushl %edi; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	CFI_REL_OFFSET edi, 0;\
-	pushl %esi; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	CFI_REL_OFFSET esi, 0;\
-	pushl %edx; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	CFI_REL_OFFSET edx, 0;\
-	pushl %ecx; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	CFI_REL_OFFSET ecx, 0;\
-	pushl %ebx; \
-	CFI_ADJUST_CFA_OFFSET 4;\
-	CFI_REL_OFFSET ebx, 0;\
-	movl $(__USER_DS), %edx; \
-	movl %edx, %ds; \
-	movl %edx, %es; \
-	movl $(__KERNEL_PERCPU), %edx; \
-	movl %edx, %fs
-
-#define RESTORE_INT_REGS \
-	popl %ebx;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	CFI_RESTORE ebx;\
-	popl %ecx;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	CFI_RESTORE ecx;\
-	popl %edx;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	CFI_RESTORE edx;\
-	popl %esi;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	CFI_RESTORE esi;\
-	popl %edi;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	CFI_RESTORE edi;\
-	popl %ebp;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	CFI_RESTORE ebp;\
-	popl %eax;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	CFI_RESTORE eax
-
-#define RESTORE_REGS	\
-	RESTORE_INT_REGS; \
-1:	popl %ds;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	/*CFI_RESTORE ds;*/\
-2:	popl %es;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	/*CFI_RESTORE es;*/\
-3:	popl %fs;	\
-	CFI_ADJUST_CFA_OFFSET -4;\
-	/*CFI_RESTORE fs;*/\
-.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
-
-#define 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
-
-#define 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
-
-#define 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
-
-ENTRY(ret_from_fork)
-	CFI_STARTPROC
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	call schedule_tail
-	GET_THREAD_INFO(%ebp)
-	popl %eax
-	CFI_ADJUST_CFA_OFFSET -4
-	pushl $0x0202			# Reset kernel eflags
-	CFI_ADJUST_CFA_OFFSET 4
-	popfl
-	CFI_ADJUST_CFA_OFFSET -4
-	jmp syscall_exit
-	CFI_ENDPROC
-END(ret_from_fork)
-
-/*
- * 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 $(VM_MASK | SEGMENT_RPL_MASK), %eax
-	cmpl $USER_RPL, %eax
-	jb resume_kernel		# not returning to v8086 or userspace
-
-ENTRY(resume_userspace)
- 	DISABLE_INTERRUPTS(CLBR_ANY)	# make sure we don't miss an interrupt
-					# setting need_resched or sigpending
-					# between sampling and the iret
-	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_nocheck
-need_resched:
-	movl TI_flags(%ebp), %ecx	# need_resched set ?
-	testb $_TIF_NEED_RESCHED, %cl
-	jz restore_all
-	testl $IF_MASK,PT_EFLAGS(%esp)	# interrupts off (exception path) ?
-	jz restore_all
-	call preempt_schedule_irq
-	jmp need_resched
-END(resume_kernel)
-#endif
-	CFI_ENDPROC
-
-/* 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(sysenter_entry)
-	CFI_STARTPROC simple
-	CFI_SIGNAL_FRAME
-	CFI_DEF_CFA esp, 0
-	CFI_REGISTER esp, ebp
-	movl TSS_sysenter_esp0(%esp),%esp
-sysenter_past_esp:
-	/*
-	 * No need to follow this irqs on/off section: the syscall
-	 * disabled irqs and here we enable it straight after entry:
-	 */
-	ENABLE_INTERRUPTS(CLBR_NONE)
-	pushl $(__USER_DS)
-	CFI_ADJUST_CFA_OFFSET 4
-	/*CFI_REL_OFFSET ss, 0*/
-	pushl %ebp
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET esp, 0
-	pushfl
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $(__USER_CS)
-	CFI_ADJUST_CFA_OFFSET 4
-	/*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 (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp)
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET eip, 0
-
-/*
- * Load the potential sixth argument from user stack.
- * Careful about security.
- */
-	cmpl $__PAGE_OFFSET-3,%ebp
-	jae syscall_fault
-1:	movl (%ebp),%ebp
-.section __ex_table,"a"
-	.align 4
-	.long 1b,syscall_fault
-.previous
-
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	GET_THREAD_INFO(%ebp)
-
-	/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
-	testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
-	jnz syscall_trace_entry
-	cmpl $(nr_syscalls), %eax
-	jae syscall_badsys
-	call *sys_call_table(,%eax,4)
-	movl %eax,PT_EAX(%esp)
-	DISABLE_INTERRUPTS(CLBR_ANY)
-	TRACE_IRQS_OFF
-	movl TI_flags(%ebp), %ecx
-	testw $_TIF_ALLWORK_MASK, %cx
-	jne syscall_exit_work
-/* 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
-	ENABLE_INTERRUPTS_SYSEXIT
-	CFI_ENDPROC
-.pushsection .fixup,"ax"
-2:	movl $0,PT_FS(%esp)
-	jmp 1b
-.section __ex_table,"a"
-	.align 4
-	.long 1b,2b
-.popsection
-ENDPROC(sysenter_entry)
-
-	# system call handler stub
-ENTRY(system_call)
-	RING0_INT_FRAME			# can't unwind into user space anyway
-	pushl %eax			# save orig_eax
-	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	GET_THREAD_INFO(%ebp)
-					# system call tracing in operation / emulation
-	/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
-	testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),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:
-	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
-	testl $TF_MASK,PT_EFLAGS(%esp)	# If tracing set singlestep flag on exit
-	jz no_singlestep
-	orl $_TIF_SINGLESTEP,TI_flags(%ebp)
-no_singlestep:
-	movl TI_flags(%ebp), %ecx
-	testw $_TIF_ALLWORK_MASK, %cx	# current->work
-	jne syscall_exit_work
-
-restore_all:
-	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 $(VM_MASK | (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:
-	TRACE_IRQS_IRET
-restore_nocheck_notrace:
-	RESTORE_REGS
-	addl $4, %esp			# skip orig_eax/error_code
-	CFI_ADJUST_CFA_OFFSET -4
-1:	INTERRUPT_RETURN
-.section .fixup,"ax"
-iret_exc:
-	pushl $0			# no error code
-	pushl $do_iret_error
-	jmp error_code
-.previous
-.section __ex_table,"a"
-	.align 4
-	.long 1b,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, paravirt_ops+PARAVIRT_enabled
-	jne restore_nocheck
-#endif
-
-	/* If returning to userspace with 16bit stack,
-	 * try to fix the higher word of ESP, as the CPU
-	 * won't restore it.
-	 * This is an "official" bug of all the x86-compatible
-	 * CPUs, which we can try to work around to make
-	 * dosemu and wine happy. */
-	movl PT_OLDESP(%esp), %eax
-	movl %esp, %edx
-	call patch_espfix_desc
-	pushl $__ESPFIX_SS
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	DISABLE_INTERRUPTS(CLBR_EAX)
-	TRACE_IRQS_OFF
-	lss (%esp), %esp
-	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
-	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 $VM_MASK, 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 %ecx			# save ti_flags for do_notify_resume
-	CFI_ADJUST_CFA_OFFSET 4
-	call save_v86_state		# %eax contains pt_regs pointer
-	popl %ecx
-	CFI_ADJUST_CFA_OFFSET -4
-	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
-	xorl %edx,%edx
-	call do_syscall_trace
-	cmpl $0, %eax
-	jne resume_userspace		# ret != 0 -> running under PTRACE_SYSEMU,
-					# so must skip actual syscall
-	movl PT_ORIG_EAX(%esp), %eax
-	cmpl $(nr_syscalls), %eax
-	jnae syscall_call
-	jmp syscall_exit
-END(syscall_trace_entry)
-
-	# perform syscall exit tracing
-	ALIGN
-syscall_exit_work:
-	testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl
-	jz work_pending
-	TRACE_IRQS_ON
-	ENABLE_INTERRUPTS(CLBR_ANY)	# could let do_syscall_trace() call
-					# schedule() instead
-	movl %esp, %eax
-	movl $1, %edx
-	call do_syscall_trace
-	jmp resume_userspace
-END(syscall_exit_work)
-	CFI_ENDPROC
-
-	RING0_INT_FRAME			# can't unwind into user space anyway
-syscall_fault:
-	pushl %eax			# save orig_eax
-	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	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
-
-#define FIXUP_ESPFIX_STACK \
-	/* since we are on a wrong stack, we cant make it a C code :( */ \
-	PER_CPU(gdt_page, %ebx); \
-	GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah); \
-	addl %esp, %eax; \
-	pushl $__KERNEL_DS; \
-	CFI_ADJUST_CFA_OFFSET 4; \
-	pushl %eax; \
-	CFI_ADJUST_CFA_OFFSET 4; \
-	lss (%esp), %esp; \
-	CFI_ADJUST_CFA_OFFSET -8;
-#define 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:;
-
-/*
- * Build the entry stubs and pointer table with
- * some assembler magic.
- */
-.data
-ENTRY(interrupt)
-.text
-
-ENTRY(irq_entries_start)
-	RING0_INT_FRAME
-vector=0
-.rept NR_IRQS
-	ALIGN
- .if vector
-	CFI_ADJUST_CFA_OFFSET -4
- .endif
-1:	pushl $~(vector)
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp common_interrupt
- .previous
-	.long 1b
- .text
-vector=vector+1
-.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:
- */
-	ALIGN
-common_interrupt:
-	SAVE_ALL
-	TRACE_IRQS_OFF
-	movl %esp,%eax
-	call do_IRQ
-	jmp ret_from_intr
-ENDPROC(common_interrupt)
-	CFI_ENDPROC
-
-#define BUILD_INTERRUPT(name, nr)	\
-ENTRY(name)				\
-	RING0_INT_FRAME;		\
-	pushl $~(nr);			\
-	CFI_ADJUST_CFA_OFFSET 4;	\
-	SAVE_ALL;			\
-	TRACE_IRQS_OFF			\
-	movl %esp,%eax;			\
-	call smp_##name;		\
-	jmp ret_from_intr;		\
-	CFI_ENDPROC;			\
-ENDPROC(name)
-
-/* The include is where all of the SMP etc. interrupts come from */
-#include "entry_arch.h"
-
-KPROBE_ENTRY(page_fault)
-	RING0_EC_FRAME
-	pushl $do_page_fault
-	CFI_ADJUST_CFA_OFFSET 4
-	ALIGN
-error_code:
-	/* the function address is in %fs's slot on the stack */
-	pushl %es
-	CFI_ADJUST_CFA_OFFSET 4
-	/*CFI_REL_OFFSET es, 0*/
-	pushl %ds
-	CFI_ADJUST_CFA_OFFSET 4
-	/*CFI_REL_OFFSET ds, 0*/
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET eax, 0
-	pushl %ebp
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET ebp, 0
-	pushl %edi
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET edi, 0
-	pushl %esi
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET esi, 0
-	pushl %edx
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET edx, 0
-	pushl %ecx
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET ecx, 0
-	pushl %ebx
-	CFI_ADJUST_CFA_OFFSET 4
-	CFI_REL_OFFSET ebx, 0
-	cld
-	pushl %fs
-	CFI_ADJUST_CFA_OFFSET 4
-	/*CFI_REL_OFFSET fs, 0*/
-	movl $(__KERNEL_PERCPU), %ecx
-	movl %ecx, %fs
-	UNWIND_ESPFIX_STACK
-	popl %ecx
-	CFI_ADJUST_CFA_OFFSET -4
-	/*CFI_REGISTER es, ecx*/
-	movl PT_FS(%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
-	mov  %ecx, PT_FS(%esp)
-	/*CFI_REL_OFFSET fs, ES*/
-	movl $(__USER_DS), %ecx
-	movl %ecx, %ds
-	movl %ecx, %es
-	movl %esp,%eax			# pt_regs pointer
-	call *%edi
-	jmp ret_from_exception
-	CFI_ENDPROC
-KPROBE_END(page_fault)
-
-ENTRY(coprocessor_error)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_coprocessor_error
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(coprocessor_error)
-
-ENTRY(simd_coprocessor_error)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_simd_coprocessor_error
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(simd_coprocessor_error)
-
-ENTRY(device_not_available)
-	RING0_INT_FRAME
-	pushl $-1			# mark this as an int
-	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	GET_CR0_INTO_EAX
-	testl $0x4, %eax		# EM (math emulation bit)
-	jne device_not_available_emulate
-	preempt_stop(CLBR_ANY)
-	call math_state_restore
-	jmp ret_from_exception
-device_not_available_emulate:
-	pushl $0			# temporary storage for ORIG_EIP
-	CFI_ADJUST_CFA_OFFSET 4
-	call math_emulate
-	addl $4, %esp
-	CFI_ADJUST_CFA_OFFSET -4
-	jmp ret_from_exception
-	CFI_ENDPROC
-END(device_not_available)
-
-/*
- * 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_esp0+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.
- */
-#define FIX_STACK(offset, ok, label)		\
-	cmpw $__KERNEL_CS,4(%esp);		\
-	jne ok;					\
-label:						\
-	movl TSS_sysenter_esp0+offset(%esp),%esp;	\
-	CFI_DEF_CFA esp, 0;			\
-	CFI_UNDEFINED eip;			\
-	pushfl;					\
-	CFI_ADJUST_CFA_OFFSET 4;		\
-	pushl $__KERNEL_CS;			\
-	CFI_ADJUST_CFA_OFFSET 4;		\
-	pushl $sysenter_past_esp;		\
-	CFI_ADJUST_CFA_OFFSET 4;		\
-	CFI_REL_OFFSET eip, 0
-
-KPROBE_ENTRY(debug)
-	RING0_INT_FRAME
-	cmpl $sysenter_entry,(%esp)
-	jne debug_stack_correct
-	FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
-debug_stack_correct:
-	pushl $-1			# mark this as an int
-	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	xorl %edx,%edx			# error code 0
-	movl %esp,%eax			# pt_regs pointer
-	call do_debug
-	jmp ret_from_exception
-	CFI_ENDPROC
-KPROBE_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.
- */
-KPROBE_ENTRY(nmi)
-	RING0_INT_FRAME
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	movl %ss, %eax
-	cmpw $__ESPFIX_SS, %ax
-	popl %eax
-	CFI_ADJUST_CFA_OFFSET -4
-	je nmi_espfix_stack
-	cmpl $sysenter_entry,(%esp)
-	je nmi_stack_fixup
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	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 %eax
-	CFI_ADJUST_CFA_OFFSET -4
-	jae nmi_stack_correct
-	cmpl $sysenter_entry,12(%esp)
-	je nmi_debug_stack_check
-nmi_stack_correct:
-	/* We have a RING0_INT_FRAME here */
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	xorl %edx,%edx		# zero error code
-	movl %esp,%eax		# pt_regs pointer
-	call do_nmi
-	jmp restore_nocheck_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 %ss
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl %esp
-	CFI_ADJUST_CFA_OFFSET 4
-	addw $4, (%esp)
-	/* copy the iret frame of 12 bytes */
-	.rept 3
-	pushl 16(%esp)
-	CFI_ADJUST_CFA_OFFSET 4
-	.endr
-	pushl %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	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
-1:	INTERRUPT_RETURN
-	CFI_ENDPROC
-.section __ex_table,"a"
-	.align 4
-	.long 1b,iret_exc
-.previous
-KPROBE_END(nmi)
-
-#ifdef CONFIG_PARAVIRT
-ENTRY(native_iret)
-1:	iret
-.section __ex_table,"a"
-	.align 4
-	.long 1b,iret_exc
-.previous
-END(native_iret)
-
-ENTRY(native_irq_enable_sysexit)
-	sti
-	sysexit
-END(native_irq_enable_sysexit)
-#endif
-
-KPROBE_ENTRY(int3)
-	RING0_INT_FRAME
-	pushl $-1			# mark this as an int
-	CFI_ADJUST_CFA_OFFSET 4
-	SAVE_ALL
-	xorl %edx,%edx		# zero error code
-	movl %esp,%eax		# pt_regs pointer
-	call do_int3
-	jmp ret_from_exception
-	CFI_ENDPROC
-KPROBE_END(int3)
-
-ENTRY(overflow)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_overflow
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(overflow)
-
-ENTRY(bounds)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_bounds
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(bounds)
-
-ENTRY(invalid_op)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_invalid_op
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(invalid_op)
-
-ENTRY(coprocessor_segment_overrun)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_coprocessor_segment_overrun
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(coprocessor_segment_overrun)
-
-ENTRY(invalid_TSS)
-	RING0_EC_FRAME
-	pushl $do_invalid_TSS
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(invalid_TSS)
-
-ENTRY(segment_not_present)
-	RING0_EC_FRAME
-	pushl $do_segment_not_present
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(segment_not_present)
-
-ENTRY(stack_segment)
-	RING0_EC_FRAME
-	pushl $do_stack_segment
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(stack_segment)
-
-KPROBE_ENTRY(general_protection)
-	RING0_EC_FRAME
-	pushl $do_general_protection
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-KPROBE_END(general_protection)
-
-ENTRY(alignment_check)
-	RING0_EC_FRAME
-	pushl $do_alignment_check
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(alignment_check)
-
-ENTRY(divide_error)
-	RING0_INT_FRAME
-	pushl $0			# no error code
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_divide_error
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(divide_error)
-
-#ifdef CONFIG_X86_MCE
-ENTRY(machine_check)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl machine_check_vector
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(machine_check)
-#endif
-
-ENTRY(spurious_interrupt_bug)
-	RING0_INT_FRAME
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	pushl $do_spurious_interrupt_bug
-	CFI_ADJUST_CFA_OFFSET 4
-	jmp error_code
-	CFI_ENDPROC
-END(spurious_interrupt_bug)
-
-ENTRY(kernel_thread_helper)
-	pushl $0		# fake return address for unwinder
-	CFI_STARTPROC
-	movl %edx,%eax
-	push %edx
-	CFI_ADJUST_CFA_OFFSET 4
-	call *%ebx
-	push %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	call do_exit
-	CFI_ENDPROC
-ENDPROC(kernel_thread_helper)
-
-#ifdef CONFIG_XEN
-ENTRY(xen_hypervisor_callback)
-	CFI_STARTPROC
-	pushl $0
-	CFI_ADJUST_CFA_OFFSET 4
-	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
-
-	call xen_iret_crit_fixup
-
-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 %eax
-	CFI_ADJUST_CFA_OFFSET 4
-	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 %eax
-	CFI_ADJUST_CFA_OFFSET -4
-	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 $0		# EAX == 0 => Category 1 (Bad segment)
-	CFI_ADJUST_CFA_OFFSET 4
-	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)
-
-#endif	/* CONFIG_XEN */
-
-.section .rodata,"a"
-#include "syscall_table_32.S"
-
-syscall_table_size=(.-sys_call_table)