2 * linux/arch/x86_64/entry.S
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs
6 * Copyright (C) 2000 Pavel Machek <pavel@suse.cz>
12 * entry.S contains the system-call and fault low-level handling routines.
14 * NOTE: This code handles signal-recognition, which happens every time
15 * after an interrupt and after each system call.
17 * Normal syscalls and interrupts don't save a full stack frame, this is
18 * only done for syscall tracing, signals or fork/exec et.al.
20 * A note on terminology:
21 * - top of stack: Architecture defined interrupt frame from SS to RIP
22 * at the top of the kernel process stack.
23 * - partial stack frame: partially saved registers upto R11.
24 * - full stack frame: Like partial stack frame, but all register saved.
27 * - schedule it carefully for the final hardware.
31 #include <linux/config.h>
32 #include <linux/linkage.h>
33 #include <asm/segment.h>
35 #include <asm/cache.h>
36 #include <asm/errno.h>
37 #include <asm/dwarf2.h>
38 #include <asm/calling.h>
39 #include <asm/asm-offsets.h>
41 #include <asm/unistd.h>
42 #include <asm/thread_info.h>
43 #include <asm/hw_irq.h>
48 #ifndef CONFIG_PREEMPT
49 #define retint_kernel retint_restore_args
53 * C code is not supposed to know about undefined top of stack. Every time
54 * a C function with an pt_regs argument is called from the SYSCALL based
55 * fast path FIXUP_TOP_OF_STACK is needed.
56 * RESTORE_TOP_OF_STACK syncs the syscall state after any possible ptregs
60 /* %rsp:at FRAMEEND */
61 .macro FIXUP_TOP_OF_STACK tmp
62 movq %gs:pda_oldrsp,\tmp
64 movq $__USER_DS,SS(%rsp)
65 movq $__USER_CS,CS(%rsp)
67 movq R11(%rsp),\tmp /* get eflags */
68 movq \tmp,EFLAGS(%rsp)
71 .macro RESTORE_TOP_OF_STACK tmp,offset=0
72 movq RSP-\offset(%rsp),\tmp
73 movq \tmp,%gs:pda_oldrsp
74 movq EFLAGS-\offset(%rsp),\tmp
75 movq \tmp,R11-\offset(%rsp)
78 .macro FAKE_STACK_FRAME child_rip
79 /* push in order ss, rsp, eflags, cs, rip */
82 CFI_ADJUST_CFA_OFFSET 8
83 /*CFI_REL_OFFSET ss,0*/
85 CFI_ADJUST_CFA_OFFSET 8
87 pushq $(1<<9) /* eflags - interrupts on */
88 CFI_ADJUST_CFA_OFFSET 8
89 /*CFI_REL_OFFSET rflags,0*/
90 pushq $__KERNEL_CS /* cs */
91 CFI_ADJUST_CFA_OFFSET 8
92 /*CFI_REL_OFFSET cs,0*/
93 pushq \child_rip /* rip */
94 CFI_ADJUST_CFA_OFFSET 8
96 pushq %rax /* orig rax */
97 CFI_ADJUST_CFA_OFFSET 8
100 .macro UNFAKE_STACK_FRAME
102 CFI_ADJUST_CFA_OFFSET -(6*8)
105 .macro CFI_DEFAULT_STACK start=1
110 CFI_DEF_CFA_OFFSET SS+8
112 CFI_REL_OFFSET r15,R15
113 CFI_REL_OFFSET r14,R14
114 CFI_REL_OFFSET r13,R13
115 CFI_REL_OFFSET r12,R12
116 CFI_REL_OFFSET rbp,RBP
117 CFI_REL_OFFSET rbx,RBX
118 CFI_REL_OFFSET r11,R11
119 CFI_REL_OFFSET r10,R10
122 CFI_REL_OFFSET rax,RAX
123 CFI_REL_OFFSET rcx,RCX
124 CFI_REL_OFFSET rdx,RDX
125 CFI_REL_OFFSET rsi,RSI
126 CFI_REL_OFFSET rdi,RDI
127 CFI_REL_OFFSET rip,RIP
128 /*CFI_REL_OFFSET cs,CS*/
129 /*CFI_REL_OFFSET rflags,EFLAGS*/
130 CFI_REL_OFFSET rsp,RSP
131 /*CFI_REL_OFFSET ss,SS*/
134 * A newly forked process directly context switches into this.
140 GET_THREAD_INFO(%rcx)
141 testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT),threadinfo_flags(%rcx)
145 testl $3,CS-ARGOFFSET(%rsp) # from kernel_thread?
146 je int_ret_from_sys_call
147 testl $_TIF_IA32,threadinfo_flags(%rcx)
148 jnz int_ret_from_sys_call
149 RESTORE_TOP_OF_STACK %rdi,ARGOFFSET
150 jmp ret_from_sys_call
153 call syscall_trace_leave
154 GET_THREAD_INFO(%rcx)
160 * System call entry. Upto 6 arguments in registers are supported.
162 * SYSCALL does not save anything on the stack and does not change the
168 * rax system call number
170 * rcx return address for syscall/sysret, C arg3
173 * r10 arg3 (--> moved to rcx for C)
176 * r11 eflags for syscall/sysret, temporary for C
177 * r12-r15,rbp,rbx saved by C code, not touched.
179 * Interrupts are off on entry.
180 * Only called from user space.
182 * XXX if we had a free scratch register we could save the RSP into the stack frame
183 * and report it properly in ps. Unfortunately we haven't.
185 * When user can change the frames always force IRET. That is because
186 * it deals with uncanonical addresses better. SYSRET has trouble
187 * with them due to bugs in both AMD and Intel CPUs.
194 /*CFI_REGISTER rflags,r11*/
196 movq %rsp,%gs:pda_oldrsp
197 movq %gs:pda_kernelstack,%rsp
200 movq %rax,ORIG_RAX-ARGOFFSET(%rsp)
201 movq %rcx,RIP-ARGOFFSET(%rsp)
202 CFI_REL_OFFSET rip,RIP-ARGOFFSET
203 GET_THREAD_INFO(%rcx)
204 testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%rcx)
207 cmpq $__NR_syscall_max,%rax
210 call *sys_call_table(,%rax,8) # XXX: rip relative
211 movq %rax,RAX-ARGOFFSET(%rsp)
213 * Syscall return path ending with SYSRET (fast path)
214 * Has incomplete stack frame and undefined top of stack.
216 .globl ret_from_sys_call
218 movl $_TIF_ALLWORK_MASK,%edi
221 GET_THREAD_INFO(%rcx)
223 movl threadinfo_flags(%rcx),%edx
227 movq RIP-ARGOFFSET(%rsp),%rcx
229 RESTORE_ARGS 0,-ARG_SKIP,1
230 /*CFI_REGISTER rflags,r11*/
231 movq %gs:pda_oldrsp,%rsp
235 /* Handle reschedules */
236 /* edx: work, edi: workmask */
239 bt $TIF_NEED_RESCHED,%edx
243 CFI_ADJUST_CFA_OFFSET 8
246 CFI_ADJUST_CFA_OFFSET -8
249 /* Handle a signal */
252 testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx
255 /* Really a signal */
256 /* edx: work flags (arg3) */
257 leaq do_notify_resume(%rip),%rax
258 leaq -ARGOFFSET(%rsp),%rdi # &pt_regs -> arg1
259 xorl %esi,%esi # oldset -> arg2
260 call ptregscall_common
261 1: movl $_TIF_NEED_RESCHED,%edi
262 /* Use IRET because user could have changed frame. This
263 works because ptregscall_common has called FIXUP_TOP_OF_STACK. */
268 movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
269 jmp ret_from_sys_call
271 /* Do syscall tracing */
275 movq $-ENOSYS,RAX(%rsp)
276 FIXUP_TOP_OF_STACK %rdi
278 call syscall_trace_enter
279 LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */
281 cmpq $__NR_syscall_max,%rax
283 movq %r10,%rcx /* fixup for C */
284 call *sys_call_table(,%rax,8)
285 1: movq %rax,RAX-ARGOFFSET(%rsp)
286 /* Use IRET because user could have changed frame */
287 jmp int_ret_from_sys_call
292 * Syscall return path ending with IRET.
293 * Has correct top of stack, but partial stack frame.
295 ENTRY(int_ret_from_sys_call)
297 CFI_DEF_CFA rsp,SS+8-ARGOFFSET
298 /*CFI_REL_OFFSET ss,SS-ARGOFFSET*/
299 CFI_REL_OFFSET rsp,RSP-ARGOFFSET
300 /*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
301 /*CFI_REL_OFFSET cs,CS-ARGOFFSET*/
302 CFI_REL_OFFSET rip,RIP-ARGOFFSET
303 CFI_REL_OFFSET rdx,RDX-ARGOFFSET
304 CFI_REL_OFFSET rcx,RCX-ARGOFFSET
305 CFI_REL_OFFSET rax,RAX-ARGOFFSET
306 CFI_REL_OFFSET rdi,RDI-ARGOFFSET
307 CFI_REL_OFFSET rsi,RSI-ARGOFFSET
308 CFI_REL_OFFSET r8,R8-ARGOFFSET
309 CFI_REL_OFFSET r9,R9-ARGOFFSET
310 CFI_REL_OFFSET r10,R10-ARGOFFSET
311 CFI_REL_OFFSET r11,R11-ARGOFFSET
313 testl $3,CS-ARGOFFSET(%rsp)
314 je retint_restore_args
315 movl $_TIF_ALLWORK_MASK,%edi
316 /* edi: mask to check */
318 GET_THREAD_INFO(%rcx)
319 movl threadinfo_flags(%rcx),%edx
322 andl $~TS_COMPAT,threadinfo_status(%rcx)
325 /* Either reschedule or signal or syscall exit tracking needed. */
326 /* First do a reschedule test. */
327 /* edx: work, edi: workmask */
329 bt $TIF_NEED_RESCHED,%edx
333 CFI_ADJUST_CFA_OFFSET 8
336 CFI_ADJUST_CFA_OFFSET -8
340 /* handle signals and tracing -- both require a full stack frame */
344 /* Check for syscall exit trace */
345 testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edx
348 CFI_ADJUST_CFA_OFFSET 8
349 leaq 8(%rsp),%rdi # &ptregs -> arg1
350 call syscall_trace_leave
352 CFI_ADJUST_CFA_OFFSET -8
353 andl $~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP),%edi
358 testl $(_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_SINGLESTEP),%edx
360 movq %rsp,%rdi # &ptregs -> arg1
361 xorl %esi,%esi # oldset -> arg2
362 call do_notify_resume
363 1: movl $_TIF_NEED_RESCHED,%edi
369 END(int_ret_from_sys_call)
372 * Certain special system calls that need to save a complete full stack frame.
375 .macro PTREGSCALL label,func,arg
378 leaq \func(%rip),%rax
379 leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */
380 jmp ptregscall_common
386 PTREGSCALL stub_clone, sys_clone, %r8
387 PTREGSCALL stub_fork, sys_fork, %rdi
388 PTREGSCALL stub_vfork, sys_vfork, %rdi
389 PTREGSCALL stub_rt_sigsuspend, sys_rt_sigsuspend, %rdx
390 PTREGSCALL stub_sigaltstack, sys_sigaltstack, %rdx
391 PTREGSCALL stub_iopl, sys_iopl, %rsi
393 ENTRY(ptregscall_common)
395 CFI_ADJUST_CFA_OFFSET -8
396 CFI_REGISTER rip, r11
399 CFI_REGISTER rip, r15
400 FIXUP_TOP_OF_STACK %r11
402 RESTORE_TOP_OF_STACK %r11
404 CFI_REGISTER rip, r11
407 CFI_ADJUST_CFA_OFFSET 8
408 CFI_REL_OFFSET rip, 0
411 END(ptregscall_common)
416 CFI_ADJUST_CFA_OFFSET -8
417 CFI_REGISTER rip, r11
419 FIXUP_TOP_OF_STACK %r11
421 RESTORE_TOP_OF_STACK %r11
424 jmp int_ret_from_sys_call
429 * sigreturn is special because it needs to restore all registers on return.
430 * This cannot be done with SYSRET, so use the IRET return path instead.
432 ENTRY(stub_rt_sigreturn)
435 CFI_ADJUST_CFA_OFFSET -8
438 FIXUP_TOP_OF_STACK %r11
439 call sys_rt_sigreturn
440 movq %rax,RAX(%rsp) # fixme, this could be done at the higher layer
442 jmp int_ret_from_sys_call
444 END(stub_rt_sigreturn)
447 * initial frame state for interrupts and exceptions
451 CFI_DEF_CFA rsp,SS+8-\ref
452 /*CFI_REL_OFFSET ss,SS-\ref*/
453 CFI_REL_OFFSET rsp,RSP-\ref
454 /*CFI_REL_OFFSET rflags,EFLAGS-\ref*/
455 /*CFI_REL_OFFSET cs,CS-\ref*/
456 CFI_REL_OFFSET rip,RIP-\ref
459 /* initial frame state for interrupts (and exceptions without error code) */
460 #define INTR_FRAME _frame RIP
461 /* initial frame state for exceptions with error code (and interrupts with
462 vector already pushed) */
463 #define XCPT_FRAME _frame ORIG_RAX
466 * Interrupt entry/exit.
468 * Interrupt entry points save only callee clobbered registers in fast path.
470 * Entry runs with interrupts off.
473 /* 0(%rsp): interrupt number */
474 .macro interrupt func
476 #ifdef CONFIG_DEBUG_INFO
480 * Setup a stack frame pointer. This allows gdb to trace
481 * back to the original stack.
484 CFI_DEF_CFA_REGISTER rbp
487 leaq -ARGOFFSET(%rsp),%rdi # arg1 for handler
492 1: incl %gs:pda_irqcount # RED-PEN should check preempt count
493 movq %gs:pda_irqstackptr,%rax
494 cmoveq %rax,%rsp /*todo This needs CFI annotation! */
495 pushq %rdi # save old stack
496 #ifndef CONFIG_DEBUG_INFO
497 CFI_ADJUST_CFA_OFFSET 8
502 ENTRY(common_interrupt)
505 /* 0(%rsp): oldrsp-ARGOFFSET */
508 #ifndef CONFIG_DEBUG_INFO
509 CFI_ADJUST_CFA_OFFSET -8
512 decl %gs:pda_irqcount
513 #ifdef CONFIG_DEBUG_INFO
515 CFI_DEF_CFA_REGISTER rsp
517 leaq ARGOFFSET(%rdi),%rsp /*todo This needs CFI annotation! */
519 GET_THREAD_INFO(%rcx)
520 testl $3,CS-ARGOFFSET(%rsp)
523 /* Interrupt came from user space */
525 * Has a correct top of stack, but a partial stack frame
526 * %rcx: thread info. Interrupts off.
528 retint_with_reschedule:
529 movl $_TIF_WORK_MASK,%edi
531 movl threadinfo_flags(%rcx),%edx
543 .section __ex_table,"a"
544 .quad iret_label,bad_iret
547 /* force a signal here? this matches i386 behaviour */
548 /* running with kernel gs */
550 movq $11,%rdi /* SIGSEGV */
555 /* edi: workmask, edx: work */
558 bt $TIF_NEED_RESCHED,%edx
562 CFI_ADJUST_CFA_OFFSET 8
565 CFI_ADJUST_CFA_OFFSET -8
566 GET_THREAD_INFO(%rcx)
571 testl $(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SINGLESTEP),%edx
575 movq $-1,ORIG_RAX(%rsp)
576 xorl %esi,%esi # oldset
577 movq %rsp,%rdi # &pt_regs
578 call do_notify_resume
581 movl $_TIF_NEED_RESCHED,%edi
582 GET_THREAD_INFO(%rcx)
585 #ifdef CONFIG_PREEMPT
586 /* Returning to kernel space. Check if we need preemption */
587 /* rcx: threadinfo. interrupts off. */
590 cmpl $0,threadinfo_preempt_count(%rcx)
591 jnz retint_restore_args
592 bt $TIF_NEED_RESCHED,threadinfo_flags(%rcx)
593 jnc retint_restore_args
594 bt $9,EFLAGS-ARGOFFSET(%rsp) /* interrupts off? */
595 jnc retint_restore_args
596 call preempt_schedule_irq
601 END(common_interrupt)
606 .macro apicinterrupt num,func
609 CFI_ADJUST_CFA_OFFSET 8
615 ENTRY(thermal_interrupt)
616 apicinterrupt THERMAL_APIC_VECTOR,smp_thermal_interrupt
617 END(thermal_interrupt)
619 ENTRY(threshold_interrupt)
620 apicinterrupt THRESHOLD_APIC_VECTOR,mce_threshold_interrupt
621 END(threshold_interrupt)
624 ENTRY(reschedule_interrupt)
625 apicinterrupt RESCHEDULE_VECTOR,smp_reschedule_interrupt
626 END(reschedule_interrupt)
628 .macro INVALIDATE_ENTRY num
629 ENTRY(invalidate_interrupt\num)
630 apicinterrupt INVALIDATE_TLB_VECTOR_START+\num,smp_invalidate_interrupt
631 END(invalidate_interrupt\num)
643 ENTRY(call_function_interrupt)
644 apicinterrupt CALL_FUNCTION_VECTOR,smp_call_function_interrupt
645 END(call_function_interrupt)
648 #ifdef CONFIG_X86_LOCAL_APIC
649 ENTRY(apic_timer_interrupt)
650 apicinterrupt LOCAL_TIMER_VECTOR,smp_apic_timer_interrupt
651 END(apic_timer_interrupt)
653 ENTRY(error_interrupt)
654 apicinterrupt ERROR_APIC_VECTOR,smp_error_interrupt
657 ENTRY(spurious_interrupt)
658 apicinterrupt SPURIOUS_APIC_VECTOR,smp_spurious_interrupt
659 END(spurious_interrupt)
663 * Exception entry points.
667 pushq $0 /* push error code/oldrax */
668 CFI_ADJUST_CFA_OFFSET 8
669 pushq %rax /* push real oldrax to the rdi slot */
670 CFI_ADJUST_CFA_OFFSET 8
676 .macro errorentry sym
679 CFI_ADJUST_CFA_OFFSET 8
685 /* error code is on the stack already */
686 /* handle NMI like exceptions that can happen everywhere */
687 .macro paranoidentry sym, ist=0
691 movl $MSR_GS_BASE,%ecx
699 movq %gs:pda_data_offset, %rbp
702 movq ORIG_RAX(%rsp),%rsi
703 movq $-1,ORIG_RAX(%rsp)
705 subq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
709 addq $EXCEPTION_STKSZ, per_cpu__init_tss + TSS_ist + (\ist - 1) * 8(%rbp)
715 * Exception entry point. This expects an error code/orig_rax on the stack
716 * and the exception handler in %rax.
720 /* rdi slot contains rax, oldrax contains error code */
723 CFI_ADJUST_CFA_OFFSET (14*8)
725 CFI_REL_OFFSET rsi,RSI
726 movq 14*8(%rsp),%rsi /* load rax from rdi slot */
728 CFI_REL_OFFSET rdx,RDX
730 CFI_REL_OFFSET rcx,RCX
731 movq %rsi,10*8(%rsp) /* store rax */
732 CFI_REL_OFFSET rax,RAX
738 CFI_REL_OFFSET r10,R10
740 CFI_REL_OFFSET r11,R11
742 CFI_REL_OFFSET rbx,RBX
744 CFI_REL_OFFSET rbp,RBP
746 CFI_REL_OFFSET r12,R12
748 CFI_REL_OFFSET r13,R13
750 CFI_REL_OFFSET r14,R14
752 CFI_REL_OFFSET r15,R15
761 movq ORIG_RAX(%rsp),%rsi /* get error code */
762 movq $-1,ORIG_RAX(%rsp)
764 /* ebx: no swapgs flag (1: don't need swapgs, 0: need it) */
769 GET_THREAD_INFO(%rcx)
772 movl threadinfo_flags(%rcx),%edx
773 movl $_TIF_WORK_MASK,%edi
783 /* There are two places in the kernel that can potentially fault with
784 usergs. Handle them here. The exception handlers after
785 iret run with kernel gs again, so don't set the user space flag.
786 B stepping K8s sometimes report an truncated RIP for IRET
787 exceptions returning to compat mode. Check for these here too. */
788 leaq iret_label(%rip),%rbp
791 movl %ebp,%ebp /* zero extend */
794 cmpq $gs_change,RIP(%rsp)
799 /* Reload gs selector with exception handling */
800 /* edi: new selector */
804 CFI_ADJUST_CFA_OFFSET 8
809 2: mfence /* workaround */
812 CFI_ADJUST_CFA_OFFSET -8
815 ENDPROC(load_gs_index)
817 .section __ex_table,"a"
819 .quad gs_change,bad_gs
822 /* running with kernelgs */
824 swapgs /* switch back to user gs */
831 * Create a kernel thread.
833 * C extern interface:
834 * extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
836 * asm input arguments:
837 * rdi: fn, rsi: arg, rdx: flags
841 FAKE_STACK_FRAME $child_rip
844 # rdi: flags, rsi: usp, rdx: will be &pt_regs
846 orq kernel_thread_flags(%rip),%rdi
859 * It isn't worth to check for reschedule here,
860 * so internally to the x86_64 port you can rely on kernel_thread()
861 * not to reschedule the child before returning, this avoids the need
862 * of hacks for example to fork off the per-CPU idle tasks.
863 * [Hopefully no generic code relies on the reschedule -AK]
869 ENDPROC(kernel_thread)
873 * Here we are in the child and the registers are set as they were
874 * at kernel_thread() invocation in the parent.
885 * execve(). This function needs to use IRET, not SYSRET, to set up all state properly.
887 * C extern interface:
888 * extern long execve(char *name, char **argv, char **envp)
890 * asm input arguments:
891 * rdi: name, rsi: argv, rdx: envp
893 * We want to fallback into:
894 * extern long sys_execve(char *name, char **argv,char **envp, struct pt_regs regs)
896 * do_sys_execve asm fallback arguments:
897 * rdi: name, rsi: argv, rdx: envp, fake frame on the stack
907 je int_ret_from_sys_call
914 KPROBE_ENTRY(page_fault)
915 errorentry do_page_fault
919 ENTRY(coprocessor_error)
920 zeroentry do_coprocessor_error
921 END(coprocessor_error)
923 ENTRY(simd_coprocessor_error)
924 zeroentry do_simd_coprocessor_error
925 END(simd_coprocessor_error)
927 ENTRY(device_not_available)
928 zeroentry math_state_restore
929 END(device_not_available)
931 /* runs on exception stack */
935 CFI_ADJUST_CFA_OFFSET 8
936 paranoidentry do_debug, DEBUG_STACK
942 /* runs on exception stack */
946 CFI_ADJUST_CFA_OFFSET 8
949 * "Paranoid" exit path from exception stack.
950 * Paranoid because this is used by NMIs and cannot take
951 * any kernel state for granted.
952 * We don't do kernel preemption checks here, because only
953 * NMI should be common and it does not enable IRQs and
954 * cannot get reschedule ticks.
956 /* ebx: no swapgs flag */
958 testl %ebx,%ebx /* swapgs needed? */
961 jnz paranoid_userspace
968 GET_THREAD_INFO(%rcx)
969 movl threadinfo_flags(%rcx),%ebx
970 andl $_TIF_WORK_MASK,%ebx
972 movq %rsp,%rdi /* &pt_regs */
974 movq %rax,%rsp /* switch stack for scheduling */
975 testl $_TIF_NEED_RESCHED,%ebx
976 jnz paranoid_schedule
977 movl %ebx,%edx /* arg3: thread flags */
979 xorl %esi,%esi /* arg2: oldset */
980 movq %rsp,%rdi /* arg1: &pt_regs */
981 call do_notify_resume
983 jmp paranoid_userspace
988 jmp paranoid_userspace
996 CFI_ADJUST_CFA_OFFSET 8
997 paranoidentry do_int3, DEBUG_STACK
1004 zeroentry do_overflow
1012 zeroentry do_invalid_op
1015 ENTRY(coprocessor_segment_overrun)
1016 zeroentry do_coprocessor_segment_overrun
1017 END(coprocessor_segment_overrun)
1020 zeroentry do_reserved
1023 /* runs on exception stack */
1026 paranoidentry do_double_fault
1032 errorentry do_invalid_TSS
1035 ENTRY(segment_not_present)
1036 errorentry do_segment_not_present
1037 END(segment_not_present)
1039 /* runs on exception stack */
1040 ENTRY(stack_segment)
1042 paranoidentry do_stack_segment
1047 KPROBE_ENTRY(general_protection)
1048 errorentry do_general_protection
1049 END(general_protection)
1052 ENTRY(alignment_check)
1053 errorentry do_alignment_check
1054 END(alignment_check)
1057 zeroentry do_divide_error
1060 ENTRY(spurious_interrupt_bug)
1061 zeroentry do_spurious_interrupt_bug
1062 END(spurious_interrupt_bug)
1064 #ifdef CONFIG_X86_MCE
1065 /* runs on exception stack */
1066 ENTRY(machine_check)
1069 CFI_ADJUST_CFA_OFFSET 8
1070 paranoidentry do_machine_check
1078 movq %gs:pda_irqstackptr,%rax
1080 CFI_DEF_CFA_REGISTER rdx
1081 incl %gs:pda_irqcount
1084 /*todo CFI_DEF_CFA_EXPRESSION ...*/
1087 CFI_DEF_CFA_REGISTER rsp
1088 decl %gs:pda_irqcount
1091 ENDPROC(call_softirq)