2 * linux/arch/i386/entry.S
4 * Copyright (C) 1991, 1992 Linus Torvalds
8 * entry.S contains the system-call and fault low-level handling routines.
9 * This also contains the timer-interrupt handler, as well as all interrupts
10 * and faults that can result in a task-switch.
12 * NOTE: This code handles signal-recognition, which happens every time
13 * after a timer-interrupt and after each system call.
15 * I changed all the .align's to 4 (16 byte alignment), as that's faster
18 * Stack layout in 'ret_from_system_call':
19 * ptrace needs to have all regs on the stack.
20 * if the order here is changed, it needs to be
21 * updated in fork.c:copy_process, signal.c:do_signal,
22 * ptrace.c and ptrace.h
41 * "current" is in register %ebx during any slow entries.
44 #include <linux/linkage.h>
45 #include <asm/thread_info.h>
46 #include <asm/irqflags.h>
47 #include <asm/errno.h>
48 #include <asm/segment.h>
52 #include <asm/percpu.h>
53 #include <asm/dwarf2.h>
54 #include "irq_vectors.h"
57 * We use macros for low-level operations which need to be overridden
58 * for paravirtualization. The following will never clobber any registers:
59 * INTERRUPT_RETURN (aka. "iret")
60 * GET_CR0_INTO_EAX (aka. "movl %cr0, %eax")
61 * ENABLE_INTERRUPTS_SYSEXIT (aka "sti; sysexit").
63 * For DISABLE_INTERRUPTS/ENABLE_INTERRUPTS (aka "cli"/"sti"), you must
64 * specify what registers can be overwritten (CLBR_NONE, CLBR_EAX/EDX/ECX/ANY).
65 * Allowing a register to be clobbered can shrink the paravirt replacement
66 * enough to patch inline, increasing performance.
69 #define nr_syscalls ((syscall_table_size)/4)
79 #define preempt_stop(clobbers) DISABLE_INTERRUPTS(clobbers); TRACE_IRQS_OFF
81 #define preempt_stop(clobbers)
82 #define resume_kernel restore_nocheck
85 .macro TRACE_IRQS_IRET
86 #ifdef CONFIG_TRACE_IRQFLAGS
87 testl $IF_MASK,PT_EFLAGS(%esp) # interrupts off?
95 #define resume_userspace_sig check_userspace
97 #define resume_userspace_sig resume_userspace
103 CFI_ADJUST_CFA_OFFSET 4;\
104 /*CFI_REL_OFFSET gs, 0;*/\
106 CFI_ADJUST_CFA_OFFSET 4;\
107 /*CFI_REL_OFFSET es, 0;*/\
109 CFI_ADJUST_CFA_OFFSET 4;\
110 /*CFI_REL_OFFSET ds, 0;*/\
112 CFI_ADJUST_CFA_OFFSET 4;\
113 CFI_REL_OFFSET eax, 0;\
115 CFI_ADJUST_CFA_OFFSET 4;\
116 CFI_REL_OFFSET ebp, 0;\
118 CFI_ADJUST_CFA_OFFSET 4;\
119 CFI_REL_OFFSET edi, 0;\
121 CFI_ADJUST_CFA_OFFSET 4;\
122 CFI_REL_OFFSET esi, 0;\
124 CFI_ADJUST_CFA_OFFSET 4;\
125 CFI_REL_OFFSET edx, 0;\
127 CFI_ADJUST_CFA_OFFSET 4;\
128 CFI_REL_OFFSET ecx, 0;\
130 CFI_ADJUST_CFA_OFFSET 4;\
131 CFI_REL_OFFSET ebx, 0;\
132 movl $(__USER_DS), %edx; \
135 movl $(__KERNEL_PDA), %edx; \
138 #define RESTORE_INT_REGS \
140 CFI_ADJUST_CFA_OFFSET -4;\
143 CFI_ADJUST_CFA_OFFSET -4;\
146 CFI_ADJUST_CFA_OFFSET -4;\
149 CFI_ADJUST_CFA_OFFSET -4;\
152 CFI_ADJUST_CFA_OFFSET -4;\
155 CFI_ADJUST_CFA_OFFSET -4;\
158 CFI_ADJUST_CFA_OFFSET -4;\
161 #define RESTORE_REGS \
164 CFI_ADJUST_CFA_OFFSET -4;\
167 CFI_ADJUST_CFA_OFFSET -4;\
170 CFI_ADJUST_CFA_OFFSET -4;\
172 .pushsection .fixup,"ax"; \
179 .section __ex_table,"a";\
186 #define RING0_INT_FRAME \
187 CFI_STARTPROC simple;\
189 CFI_DEF_CFA esp, 3*4;\
190 /*CFI_OFFSET cs, -2*4;*/\
193 #define RING0_EC_FRAME \
194 CFI_STARTPROC simple;\
196 CFI_DEF_CFA esp, 4*4;\
197 /*CFI_OFFSET cs, -2*4;*/\
200 #define RING0_PTREGS_FRAME \
201 CFI_STARTPROC simple;\
203 CFI_DEF_CFA esp, PT_OLDESP-PT_EBX;\
204 /*CFI_OFFSET cs, PT_CS-PT_OLDESP;*/\
205 CFI_OFFSET eip, PT_EIP-PT_OLDESP;\
206 /*CFI_OFFSET es, PT_ES-PT_OLDESP;*/\
207 /*CFI_OFFSET ds, PT_DS-PT_OLDESP;*/\
208 CFI_OFFSET eax, PT_EAX-PT_OLDESP;\
209 CFI_OFFSET ebp, PT_EBP-PT_OLDESP;\
210 CFI_OFFSET edi, PT_EDI-PT_OLDESP;\
211 CFI_OFFSET esi, PT_ESI-PT_OLDESP;\
212 CFI_OFFSET edx, PT_EDX-PT_OLDESP;\
213 CFI_OFFSET ecx, PT_ECX-PT_OLDESP;\
214 CFI_OFFSET ebx, PT_EBX-PT_OLDESP
219 CFI_ADJUST_CFA_OFFSET 4
221 GET_THREAD_INFO(%ebp)
223 CFI_ADJUST_CFA_OFFSET -4
224 pushl $0x0202 # Reset kernel eflags
225 CFI_ADJUST_CFA_OFFSET 4
227 CFI_ADJUST_CFA_OFFSET -4
232 * Return to user mode is not as complex as all this looks,
233 * but we want the default path for a system call return to
234 * go as quickly as possible which is why some of this is
235 * less clear than it otherwise should be.
238 # userspace resumption stub bypassing syscall exit tracing
242 preempt_stop(CLBR_ANY)
244 GET_THREAD_INFO(%ebp)
246 movl PT_EFLAGS(%esp), %eax # mix EFLAGS and CS
247 movb PT_CS(%esp), %al
248 andl $(VM_MASK | SEGMENT_RPL_MASK), %eax
250 jb resume_kernel # not returning to v8086 or userspace
252 ENTRY(resume_userspace)
253 DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt
254 # setting need_resched or sigpending
255 # between sampling and the iret
256 movl TI_flags(%ebp), %ecx
257 andl $_TIF_WORK_MASK, %ecx # is there any work to be done on
258 # int/exception return?
262 #ifdef CONFIG_PREEMPT
264 DISABLE_INTERRUPTS(CLBR_ANY)
265 cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ?
268 movl TI_flags(%ebp), %ecx # need_resched set ?
269 testb $_TIF_NEED_RESCHED, %cl
271 testl $IF_MASK,PT_EFLAGS(%esp) # interrupts off (exception path) ?
273 call preempt_schedule_irq
278 /* SYSENTER_RETURN points to after the "sysenter" instruction in
279 the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */
281 # sysenter call handler stub
282 ENTRY(sysenter_entry)
286 CFI_REGISTER esp, ebp
287 movl SYSENTER_stack_esp0(%esp),%esp
290 * No need to follow this irqs on/off section: the syscall
291 * disabled irqs and here we enable it straight after entry:
293 ENABLE_INTERRUPTS(CLBR_NONE)
295 CFI_ADJUST_CFA_OFFSET 4
296 /*CFI_REL_OFFSET ss, 0*/
298 CFI_ADJUST_CFA_OFFSET 4
299 CFI_REL_OFFSET esp, 0
301 CFI_ADJUST_CFA_OFFSET 4
303 CFI_ADJUST_CFA_OFFSET 4
304 /*CFI_REL_OFFSET cs, 0*/
305 #ifndef CONFIG_COMPAT_VDSO
307 * Push current_thread_info()->sysenter_return to the stack.
308 * A tiny bit of offset fixup is necessary - 4*4 means the 4 words
309 * pushed above; +8 corresponds to copy_thread's esp0 setting.
311 pushl (TI_sysenter_return-THREAD_SIZE+8+4*4)(%esp)
313 pushl $SYSENTER_RETURN
315 CFI_ADJUST_CFA_OFFSET 4
316 CFI_REL_OFFSET eip, 0
319 * Load the potential sixth argument from user stack.
320 * Careful about security.
322 cmpl $__PAGE_OFFSET-3,%ebp
325 .section __ex_table,"a"
327 .long 1b,syscall_fault
331 CFI_ADJUST_CFA_OFFSET 4
333 GET_THREAD_INFO(%ebp)
335 /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
336 testw $(_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
337 jnz syscall_trace_entry
338 cmpl $(nr_syscalls), %eax
340 call *sys_call_table(,%eax,4)
341 movl %eax,PT_EAX(%esp)
342 DISABLE_INTERRUPTS(CLBR_ECX|CLBR_EDX)
344 movl TI_flags(%ebp), %ecx
345 testw $_TIF_ALLWORK_MASK, %cx
346 jne syscall_exit_work
347 /* if something modifies registers it must also disable sysexit */
348 movl PT_EIP(%esp), %edx
349 movl PT_OLDESP(%esp), %ecx
352 1: mov PT_GS(%esp), %gs
353 ENABLE_INTERRUPTS_SYSEXIT
355 .pushsection .fixup,"ax"
356 2: movl $0,PT_GS(%esp)
358 .section __ex_table,"a"
363 # system call handler stub
365 RING0_INT_FRAME # can't unwind into user space anyway
366 pushl %eax # save orig_eax
367 CFI_ADJUST_CFA_OFFSET 4
369 GET_THREAD_INFO(%ebp)
370 testl $TF_MASK,PT_EFLAGS(%esp)
372 orl $_TIF_SINGLESTEP,TI_flags(%ebp)
374 # system call tracing in operation / emulation
375 /* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
376 testw $(_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
377 jnz syscall_trace_entry
378 cmpl $(nr_syscalls), %eax
381 call *sys_call_table(,%eax,4)
382 movl %eax,PT_EAX(%esp) # store the return value
384 DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt
385 # setting need_resched or sigpending
386 # between sampling and the iret
388 movl TI_flags(%ebp), %ecx
389 testw $_TIF_ALLWORK_MASK, %cx # current->work
390 jne syscall_exit_work
393 movl PT_EFLAGS(%esp), %eax # mix EFLAGS, SS and CS
394 # Warning: PT_OLDSS(%esp) contains the wrong/random values if we
395 # are returning to the kernel.
396 # See comments in process.c:copy_thread() for details.
397 movb PT_OLDSS(%esp), %ah
398 movb PT_CS(%esp), %al
399 andl $(VM_MASK | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax
400 cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
402 je ldt_ss # returning to user-space with LDT SS
405 restore_nocheck_notrace:
407 addl $4, %esp # skip orig_eax/error_code
408 CFI_ADJUST_CFA_OFFSET -4
413 ENABLE_INTERRUPTS(CLBR_NONE)
414 pushl $0 # no error code
418 .section __ex_table,"a"
425 larl PT_OLDSS(%esp), %eax
427 testl $0x00400000, %eax # returning to 32bit stack?
428 jnz restore_nocheck # allright, normal return
430 #ifdef CONFIG_PARAVIRT
432 * The kernel can't run on a non-flat stack if paravirt mode
433 * is active. Rather than try to fixup the high bits of
434 * ESP, bypass this code entirely. This may break DOSemu
435 * and/or Wine support in a paravirt VM, although the option
436 * is still available to implement the setting of the high
437 * 16-bits in the INTERRUPT_RETURN paravirt-op.
439 cmpl $0, paravirt_ops+PARAVIRT_enabled
443 /* If returning to userspace with 16bit stack,
444 * try to fix the higher word of ESP, as the CPU
446 * This is an "official" bug of all the x86-compatible
447 * CPUs, which we can try to work around to make
448 * dosemu and wine happy. */
449 movl PT_OLDESP(%esp), %eax
451 call patch_espfix_desc
453 CFI_ADJUST_CFA_OFFSET 4
455 CFI_ADJUST_CFA_OFFSET 4
456 DISABLE_INTERRUPTS(CLBR_EAX)
459 CFI_ADJUST_CFA_OFFSET -8
463 # perform work that needs to be done immediately before resumption
465 RING0_PTREGS_FRAME # can't unwind into user space anyway
467 testb $_TIF_NEED_RESCHED, %cl
471 DISABLE_INTERRUPTS(CLBR_ANY) # make sure we don't miss an interrupt
472 # setting need_resched or sigpending
473 # between sampling and the iret
475 movl TI_flags(%ebp), %ecx
476 andl $_TIF_WORK_MASK, %ecx # is there any work to be done other
477 # than syscall tracing?
479 testb $_TIF_NEED_RESCHED, %cl
482 work_notifysig: # deal with pending signals and
483 # notify-resume requests
485 testl $VM_MASK, PT_EFLAGS(%esp)
487 jne work_notifysig_v86 # returning to kernel-space or
490 call do_notify_resume
491 jmp resume_userspace_sig
495 pushl %ecx # save ti_flags for do_notify_resume
496 CFI_ADJUST_CFA_OFFSET 4
497 call save_v86_state # %eax contains pt_regs pointer
499 CFI_ADJUST_CFA_OFFSET -4
505 call do_notify_resume
506 jmp resume_userspace_sig
508 # perform syscall exit tracing
511 movl $-ENOSYS,PT_EAX(%esp)
514 call do_syscall_trace
515 movl PT_ORIG_EAX(%esp), %eax
516 cmpl $(nr_syscalls), %eax
520 # perform syscall exit tracing
523 testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl
526 ENABLE_INTERRUPTS(CLBR_ANY) # could let do_syscall_trace() call
530 call do_syscall_trace
534 RING0_INT_FRAME # can't unwind into user space anyway
536 pushl %eax # save orig_eax
537 CFI_ADJUST_CFA_OFFSET 4
539 GET_THREAD_INFO(%ebp)
540 movl $-EFAULT,PT_EAX(%esp)
544 movl $-ENOSYS,PT_EAX(%esp)
548 #define FIXUP_ESPFIX_STACK \
549 /* since we are on a wrong stack, we cant make it a C code :( */ \
550 movl %gs:PDA_cpu, %ebx; \
551 PER_CPU(cpu_gdt_descr, %ebx); \
552 movl GDS_address(%ebx), %ebx; \
553 GET_DESC_BASE(GDT_ENTRY_ESPFIX_SS, %ebx, %eax, %ax, %al, %ah); \
555 pushl $__KERNEL_DS; \
556 CFI_ADJUST_CFA_OFFSET 4; \
558 CFI_ADJUST_CFA_OFFSET 4; \
560 CFI_ADJUST_CFA_OFFSET -8;
561 #define UNWIND_ESPFIX_STACK \
563 /* see if on espfix stack */ \
564 cmpw $__ESPFIX_SS, %ax; \
566 movl $__KERNEL_DS, %eax; \
569 /* switch to normal stack */ \
570 FIXUP_ESPFIX_STACK; \
574 * Build the entry stubs and pointer table with
575 * some assembler magic.
582 ENTRY(irq_entries_start)
587 CFI_ADJUST_CFA_OFFSET -4
590 CFI_ADJUST_CFA_OFFSET 4
599 * the CPU automatically disables interrupts when executing an IRQ vector,
600 * so IRQ-flags tracing has to follow that:
611 #define BUILD_INTERRUPT(name, nr) \
615 CFI_ADJUST_CFA_OFFSET 4; \
623 /* The include is where all of the SMP etc. interrupts come from */
624 #include "entry_arch.h"
626 KPROBE_ENTRY(page_fault)
629 CFI_ADJUST_CFA_OFFSET 4
632 /* the function address is in %gs's slot on the stack */
634 CFI_ADJUST_CFA_OFFSET 4
635 /*CFI_REL_OFFSET es, 0*/
637 CFI_ADJUST_CFA_OFFSET 4
638 /*CFI_REL_OFFSET ds, 0*/
640 CFI_ADJUST_CFA_OFFSET 4
641 CFI_REL_OFFSET eax, 0
643 CFI_ADJUST_CFA_OFFSET 4
644 CFI_REL_OFFSET ebp, 0
646 CFI_ADJUST_CFA_OFFSET 4
647 CFI_REL_OFFSET edi, 0
649 CFI_ADJUST_CFA_OFFSET 4
650 CFI_REL_OFFSET esi, 0
652 CFI_ADJUST_CFA_OFFSET 4
653 CFI_REL_OFFSET edx, 0
655 CFI_ADJUST_CFA_OFFSET 4
656 CFI_REL_OFFSET ecx, 0
658 CFI_ADJUST_CFA_OFFSET 4
659 CFI_REL_OFFSET ebx, 0
662 CFI_ADJUST_CFA_OFFSET 4
663 /*CFI_REL_OFFSET gs, 0*/
664 movl $(__KERNEL_PDA), %ecx
668 CFI_ADJUST_CFA_OFFSET -4
669 /*CFI_REGISTER es, ecx*/
670 movl PT_GS(%esp), %edi # get the function address
671 movl PT_ORIG_EAX(%esp), %edx # get the error code
672 movl $-1, PT_ORIG_EAX(%esp) # no syscall to restart
673 mov %ecx, PT_GS(%esp)
674 /*CFI_REL_OFFSET gs, ES*/
675 movl $(__USER_DS), %ecx
678 movl %esp,%eax # pt_regs pointer
680 jmp ret_from_exception
682 KPROBE_END(page_fault)
684 ENTRY(coprocessor_error)
687 CFI_ADJUST_CFA_OFFSET 4
688 pushl $do_coprocessor_error
689 CFI_ADJUST_CFA_OFFSET 4
693 ENTRY(simd_coprocessor_error)
696 CFI_ADJUST_CFA_OFFSET 4
697 pushl $do_simd_coprocessor_error
698 CFI_ADJUST_CFA_OFFSET 4
702 ENTRY(device_not_available)
704 pushl $-1 # mark this as an int
705 CFI_ADJUST_CFA_OFFSET 4
708 testl $0x4, %eax # EM (math emulation bit)
709 jne device_not_available_emulate
710 preempt_stop(CLBR_ANY)
711 call math_state_restore
712 jmp ret_from_exception
713 device_not_available_emulate:
714 pushl $0 # temporary storage for ORIG_EIP
715 CFI_ADJUST_CFA_OFFSET 4
718 CFI_ADJUST_CFA_OFFSET -4
719 jmp ret_from_exception
723 * Debug traps and NMI can happen at the one SYSENTER instruction
724 * that sets up the real kernel stack. Check here, since we can't
725 * allow the wrong stack to be used.
727 * "SYSENTER_stack_esp0+12" is because the NMI/debug handler will have
728 * already pushed 3 words if it hits on the sysenter instruction:
729 * eflags, cs and eip.
731 * We just load the right stack, and push the three (known) values
732 * by hand onto the new stack - while updating the return eip past
733 * the instruction that would have done it for sysenter.
735 #define FIX_STACK(offset, ok, label) \
736 cmpw $__KERNEL_CS,4(%esp); \
739 movl SYSENTER_stack_esp0+offset(%esp),%esp; \
740 CFI_DEF_CFA esp, 0; \
743 CFI_ADJUST_CFA_OFFSET 4; \
744 pushl $__KERNEL_CS; \
745 CFI_ADJUST_CFA_OFFSET 4; \
746 pushl $sysenter_past_esp; \
747 CFI_ADJUST_CFA_OFFSET 4; \
748 CFI_REL_OFFSET eip, 0
752 cmpl $sysenter_entry,(%esp)
753 jne debug_stack_correct
754 FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
756 pushl $-1 # mark this as an int
757 CFI_ADJUST_CFA_OFFSET 4
759 xorl %edx,%edx # error code 0
760 movl %esp,%eax # pt_regs pointer
762 jmp ret_from_exception
767 * NMI is doubly nasty. It can happen _while_ we're handling
768 * a debug fault, and the debug fault hasn't yet been able to
769 * clear up the stack. So we first check whether we got an
770 * NMI on the sysenter entry path, but after that we need to
771 * check whether we got an NMI on the debug path where the debug
772 * fault happened on the sysenter path.
777 CFI_ADJUST_CFA_OFFSET 4
779 cmpw $__ESPFIX_SS, %ax
781 CFI_ADJUST_CFA_OFFSET -4
783 cmpl $sysenter_entry,(%esp)
786 CFI_ADJUST_CFA_OFFSET 4
788 /* Do not access memory above the end of our stack page,
789 * it might not exist.
791 andl $(THREAD_SIZE-1),%eax
792 cmpl $(THREAD_SIZE-20),%eax
794 CFI_ADJUST_CFA_OFFSET -4
795 jae nmi_stack_correct
796 cmpl $sysenter_entry,12(%esp)
797 je nmi_debug_stack_check
799 /* We have a RING0_INT_FRAME here */
801 CFI_ADJUST_CFA_OFFSET 4
803 xorl %edx,%edx # zero error code
804 movl %esp,%eax # pt_regs pointer
806 jmp restore_nocheck_notrace
811 FIX_STACK(12,nmi_stack_correct, 1)
812 jmp nmi_stack_correct
814 nmi_debug_stack_check:
815 /* We have a RING0_INT_FRAME here */
816 cmpw $__KERNEL_CS,16(%esp)
817 jne nmi_stack_correct
820 cmpl $debug_esp_fix_insn,(%esp)
822 FIX_STACK(24,nmi_stack_correct, 1)
823 jmp nmi_stack_correct
826 /* We have a RING0_INT_FRAME here.
828 * create the pointer to lss back
831 CFI_ADJUST_CFA_OFFSET 4
833 CFI_ADJUST_CFA_OFFSET 4
835 /* copy the iret frame of 12 bytes */
838 CFI_ADJUST_CFA_OFFSET 4
841 CFI_ADJUST_CFA_OFFSET 4
843 FIXUP_ESPFIX_STACK # %eax == %esp
844 xorl %edx,%edx # zero error code
847 lss 12+4(%esp), %esp # back to espfix stack
848 CFI_ADJUST_CFA_OFFSET -24
851 .section __ex_table,"a"
857 #ifdef CONFIG_PARAVIRT
860 .section __ex_table,"a"
865 ENTRY(native_irq_enable_sysexit)
872 pushl $-1 # mark this as an int
873 CFI_ADJUST_CFA_OFFSET 4
875 xorl %edx,%edx # zero error code
876 movl %esp,%eax # pt_regs pointer
878 jmp ret_from_exception
885 CFI_ADJUST_CFA_OFFSET 4
887 CFI_ADJUST_CFA_OFFSET 4
894 CFI_ADJUST_CFA_OFFSET 4
896 CFI_ADJUST_CFA_OFFSET 4
903 CFI_ADJUST_CFA_OFFSET 4
905 CFI_ADJUST_CFA_OFFSET 4
909 ENTRY(coprocessor_segment_overrun)
912 CFI_ADJUST_CFA_OFFSET 4
913 pushl $do_coprocessor_segment_overrun
914 CFI_ADJUST_CFA_OFFSET 4
920 pushl $do_invalid_TSS
921 CFI_ADJUST_CFA_OFFSET 4
925 ENTRY(segment_not_present)
927 pushl $do_segment_not_present
928 CFI_ADJUST_CFA_OFFSET 4
934 pushl $do_stack_segment
935 CFI_ADJUST_CFA_OFFSET 4
939 KPROBE_ENTRY(general_protection)
941 pushl $do_general_protection
942 CFI_ADJUST_CFA_OFFSET 4
945 KPROBE_END(general_protection)
947 ENTRY(alignment_check)
949 pushl $do_alignment_check
950 CFI_ADJUST_CFA_OFFSET 4
956 pushl $0 # no error code
957 CFI_ADJUST_CFA_OFFSET 4
958 pushl $do_divide_error
959 CFI_ADJUST_CFA_OFFSET 4
963 #ifdef CONFIG_X86_MCE
967 CFI_ADJUST_CFA_OFFSET 4
968 pushl machine_check_vector
969 CFI_ADJUST_CFA_OFFSET 4
974 ENTRY(spurious_interrupt_bug)
977 CFI_ADJUST_CFA_OFFSET 4
978 pushl $do_spurious_interrupt_bug
979 CFI_ADJUST_CFA_OFFSET 4
983 ENTRY(kernel_thread_helper)
984 pushl $0 # fake return address for unwinder
988 CFI_ADJUST_CFA_OFFSET 4
991 CFI_ADJUST_CFA_OFFSET 4
994 ENDPROC(kernel_thread_helper)
997 #include "syscall_table.S"
999 syscall_table_size=(.-sys_call_table)