mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Peter Zijlstra](/assets/img/avatar_default.png)
Run the lockdep_sys_exit hook after all other C code on the syscall return path. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
1116 lines
26 KiB
ArmAsm
1116 lines
26 KiB
ArmAsm
/*
|
|
* 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)
|
|
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
|
|
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)
|
|
LOCKDEP_SYS_EXIT
|
|
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:
|
|
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
|
|
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
|
|
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 $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)
|