640aa46e25
As a follow-up to "UML Support - Ptrace: adds the host SYSEMU support, for UML and general usage" (i.e. uml-support-* in current mm). Avoid unconditionally jumping to work_pending and code copying, just reuse the already existing resume_userspace path. One interesting note, from Charles P. Wright, suggested that the API is improvable with no downsides for UML (except that it will have to support yet another host API, since dropping support for the current API, for UML, is not reasonable from users' point of view). Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> CC: Charles P. Wright <cwright@cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
660 lines
14 KiB
ArmAsm
660 lines
14 KiB
ArmAsm
/*
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* linux/arch/i386/entry.S
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/*
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* entry.S contains the system-call and fault low-level handling routines.
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* This also contains the timer-interrupt handler, as well as all interrupts
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* and faults that can result in a task-switch.
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*
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* NOTE: This code handles signal-recognition, which happens every time
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* after a timer-interrupt and after each system call.
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*
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* I changed all the .align's to 4 (16 byte alignment), as that's faster
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* on a 486.
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*
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* Stack layout in 'ret_from_system_call':
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* ptrace needs to have all regs on the stack.
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* if the order here is changed, it needs to be
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* updated in fork.c:copy_process, signal.c:do_signal,
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* ptrace.c and ptrace.h
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*
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* 0(%esp) - %ebx
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* 4(%esp) - %ecx
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* 8(%esp) - %edx
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* C(%esp) - %esi
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* 10(%esp) - %edi
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* 14(%esp) - %ebp
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* 18(%esp) - %eax
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* 1C(%esp) - %ds
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* 20(%esp) - %es
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* 24(%esp) - orig_eax
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* 28(%esp) - %eip
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* 2C(%esp) - %cs
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* 30(%esp) - %eflags
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* 34(%esp) - %oldesp
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* 38(%esp) - %oldss
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*
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* "current" is in register %ebx during any slow entries.
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*/
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#include <linux/config.h>
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#include <linux/linkage.h>
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#include <asm/thread_info.h>
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#include <asm/errno.h>
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#include <asm/segment.h>
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#include <asm/smp.h>
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#include <asm/page.h>
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#include <asm/desc.h>
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#include "irq_vectors.h"
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#define nr_syscalls ((syscall_table_size)/4)
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EBX = 0x00
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ECX = 0x04
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EDX = 0x08
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ESI = 0x0C
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EDI = 0x10
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EBP = 0x14
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EAX = 0x18
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DS = 0x1C
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ES = 0x20
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ORIG_EAX = 0x24
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EIP = 0x28
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CS = 0x2C
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EFLAGS = 0x30
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OLDESP = 0x34
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OLDSS = 0x38
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CF_MASK = 0x00000001
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TF_MASK = 0x00000100
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IF_MASK = 0x00000200
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DF_MASK = 0x00000400
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NT_MASK = 0x00004000
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VM_MASK = 0x00020000
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#ifdef CONFIG_PREEMPT
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#define preempt_stop cli
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#else
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#define preempt_stop
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#define resume_kernel restore_nocheck
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#endif
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#define SAVE_ALL \
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cld; \
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pushl %es; \
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pushl %ds; \
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pushl %eax; \
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pushl %ebp; \
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pushl %edi; \
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pushl %esi; \
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pushl %edx; \
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pushl %ecx; \
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pushl %ebx; \
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movl $(__USER_DS), %edx; \
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movl %edx, %ds; \
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movl %edx, %es;
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#define RESTORE_INT_REGS \
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popl %ebx; \
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popl %ecx; \
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popl %edx; \
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popl %esi; \
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popl %edi; \
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popl %ebp; \
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popl %eax
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#define RESTORE_REGS \
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RESTORE_INT_REGS; \
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1: popl %ds; \
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2: popl %es; \
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.section .fixup,"ax"; \
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3: movl $0,(%esp); \
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jmp 1b; \
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4: movl $0,(%esp); \
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jmp 2b; \
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.previous; \
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.section __ex_table,"a";\
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.align 4; \
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.long 1b,3b; \
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.long 2b,4b; \
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.previous
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ENTRY(ret_from_fork)
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pushl %eax
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call schedule_tail
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GET_THREAD_INFO(%ebp)
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popl %eax
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jmp syscall_exit
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/*
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* Return to user mode is not as complex as all this looks,
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* but we want the default path for a system call return to
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* go as quickly as possible which is why some of this is
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* less clear than it otherwise should be.
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*/
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# userspace resumption stub bypassing syscall exit tracing
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ALIGN
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ret_from_exception:
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preempt_stop
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ret_from_intr:
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GET_THREAD_INFO(%ebp)
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movl EFLAGS(%esp), %eax # mix EFLAGS and CS
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movb CS(%esp), %al
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testl $(VM_MASK | 3), %eax
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jz resume_kernel
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ENTRY(resume_userspace)
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cli # make sure we don't miss an interrupt
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# setting need_resched or sigpending
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# between sampling and the iret
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movl TI_flags(%ebp), %ecx
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andl $_TIF_WORK_MASK, %ecx # is there any work to be done on
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# int/exception return?
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jne work_pending
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jmp restore_all
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#ifdef CONFIG_PREEMPT
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ENTRY(resume_kernel)
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cli
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cmpl $0,TI_preempt_count(%ebp) # non-zero preempt_count ?
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jnz restore_nocheck
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need_resched:
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movl TI_flags(%ebp), %ecx # need_resched set ?
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testb $_TIF_NEED_RESCHED, %cl
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jz restore_all
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testl $IF_MASK,EFLAGS(%esp) # interrupts off (exception path) ?
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jz restore_all
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call preempt_schedule_irq
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jmp need_resched
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#endif
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/* SYSENTER_RETURN points to after the "sysenter" instruction in
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the vsyscall page. See vsyscall-sysentry.S, which defines the symbol. */
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# sysenter call handler stub
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ENTRY(sysenter_entry)
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movl TSS_sysenter_esp0(%esp),%esp
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sysenter_past_esp:
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sti
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pushl $(__USER_DS)
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pushl %ebp
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pushfl
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pushl $(__USER_CS)
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pushl $SYSENTER_RETURN
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/*
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* Load the potential sixth argument from user stack.
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* Careful about security.
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*/
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cmpl $__PAGE_OFFSET-3,%ebp
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jae syscall_fault
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1: movl (%ebp),%ebp
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.section __ex_table,"a"
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.align 4
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.long 1b,syscall_fault
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.previous
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pushl %eax
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
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testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
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jnz syscall_trace_entry
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cmpl $(nr_syscalls), %eax
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jae syscall_badsys
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call *sys_call_table(,%eax,4)
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movl %eax,EAX(%esp)
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cli
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movl TI_flags(%ebp), %ecx
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testw $_TIF_ALLWORK_MASK, %cx
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jne syscall_exit_work
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/* if something modifies registers it must also disable sysexit */
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movl EIP(%esp), %edx
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movl OLDESP(%esp), %ecx
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xorl %ebp,%ebp
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sti
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sysexit
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# system call handler stub
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ENTRY(system_call)
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pushl %eax # save orig_eax
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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# system call tracing in operation / emulation
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/* Note, _TIF_SECCOMP is bit number 8, and so it needs testw and not testb */
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testw $(_TIF_SYSCALL_EMU|_TIF_SYSCALL_TRACE|_TIF_SECCOMP|_TIF_SYSCALL_AUDIT),TI_flags(%ebp)
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jnz syscall_trace_entry
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cmpl $(nr_syscalls), %eax
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jae syscall_badsys
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syscall_call:
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call *sys_call_table(,%eax,4)
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movl %eax,EAX(%esp) # store the return value
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syscall_exit:
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cli # make sure we don't miss an interrupt
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# setting need_resched or sigpending
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# between sampling and the iret
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movl TI_flags(%ebp), %ecx
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testw $_TIF_ALLWORK_MASK, %cx # current->work
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jne syscall_exit_work
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restore_all:
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movl EFLAGS(%esp), %eax # mix EFLAGS, SS and CS
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# Warning: OLDSS(%esp) contains the wrong/random values if we
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# are returning to the kernel.
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# See comments in process.c:copy_thread() for details.
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movb OLDSS(%esp), %ah
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movb CS(%esp), %al
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andl $(VM_MASK | (4 << 8) | 3), %eax
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cmpl $((4 << 8) | 3), %eax
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je ldt_ss # returning to user-space with LDT SS
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restore_nocheck:
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RESTORE_REGS
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addl $4, %esp
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1: iret
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.section .fixup,"ax"
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iret_exc:
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sti
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pushl $0 # no error code
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pushl $do_iret_error
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jmp error_code
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.previous
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.section __ex_table,"a"
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.align 4
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.long 1b,iret_exc
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.previous
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ldt_ss:
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larl OLDSS(%esp), %eax
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jnz restore_nocheck
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testl $0x00400000, %eax # returning to 32bit stack?
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jnz restore_nocheck # allright, normal return
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/* If returning to userspace with 16bit stack,
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* try to fix the higher word of ESP, as the CPU
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* won't restore it.
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* This is an "official" bug of all the x86-compatible
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* CPUs, which we can try to work around to make
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* dosemu and wine happy. */
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subl $8, %esp # reserve space for switch16 pointer
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cli
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movl %esp, %eax
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/* Set up the 16bit stack frame with switch32 pointer on top,
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* and a switch16 pointer on top of the current frame. */
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call setup_x86_bogus_stack
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RESTORE_REGS
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lss 20+4(%esp), %esp # switch to 16bit stack
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1: iret
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.section __ex_table,"a"
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.align 4
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.long 1b,iret_exc
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.previous
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# perform work that needs to be done immediately before resumption
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ALIGN
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work_pending:
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testb $_TIF_NEED_RESCHED, %cl
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jz work_notifysig
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work_resched:
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call schedule
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cli # make sure we don't miss an interrupt
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# setting need_resched or sigpending
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# between sampling and the iret
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movl TI_flags(%ebp), %ecx
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andl $_TIF_WORK_MASK, %ecx # is there any work to be done other
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# than syscall tracing?
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jz restore_all
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testb $_TIF_NEED_RESCHED, %cl
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jnz work_resched
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work_notifysig: # deal with pending signals and
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# notify-resume requests
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testl $VM_MASK, EFLAGS(%esp)
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movl %esp, %eax
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jne work_notifysig_v86 # returning to kernel-space or
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# vm86-space
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xorl %edx, %edx
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call do_notify_resume
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jmp restore_all
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ALIGN
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work_notifysig_v86:
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pushl %ecx # save ti_flags for do_notify_resume
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call save_v86_state # %eax contains pt_regs pointer
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popl %ecx
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movl %eax, %esp
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xorl %edx, %edx
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call do_notify_resume
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jmp restore_all
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# perform syscall exit tracing
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ALIGN
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syscall_trace_entry:
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movl $-ENOSYS,EAX(%esp)
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movl %esp, %eax
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xorl %edx,%edx
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call do_syscall_trace
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cmpl $0, %eax
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jne resume_userspace # ret != 0 -> running under PTRACE_SYSEMU,
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# so must skip actual syscall
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movl ORIG_EAX(%esp), %eax
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cmpl $(nr_syscalls), %eax
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jnae syscall_call
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jmp syscall_exit
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# perform syscall exit tracing
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ALIGN
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syscall_exit_work:
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testb $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP), %cl
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jz work_pending
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sti # could let do_syscall_trace() call
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# schedule() instead
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movl %esp, %eax
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movl $1, %edx
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call do_syscall_trace
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jmp resume_userspace
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ALIGN
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syscall_fault:
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pushl %eax # save orig_eax
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SAVE_ALL
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GET_THREAD_INFO(%ebp)
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movl $-EFAULT,EAX(%esp)
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jmp resume_userspace
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ALIGN
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syscall_badsys:
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movl $-ENOSYS,EAX(%esp)
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jmp resume_userspace
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#define FIXUP_ESPFIX_STACK \
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movl %esp, %eax; \
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/* switch to 32bit stack using the pointer on top of 16bit stack */ \
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lss %ss:CPU_16BIT_STACK_SIZE-8, %esp; \
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/* copy data from 16bit stack to 32bit stack */ \
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call fixup_x86_bogus_stack; \
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/* put ESP to the proper location */ \
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movl %eax, %esp;
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#define UNWIND_ESPFIX_STACK \
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pushl %eax; \
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movl %ss, %eax; \
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/* see if on 16bit stack */ \
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cmpw $__ESPFIX_SS, %ax; \
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jne 28f; \
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movl $__KERNEL_DS, %edx; \
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movl %edx, %ds; \
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movl %edx, %es; \
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/* switch to 32bit stack */ \
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FIXUP_ESPFIX_STACK \
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28: popl %eax;
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/*
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* Build the entry stubs and pointer table with
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* some assembler magic.
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*/
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.data
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ENTRY(interrupt)
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.text
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vector=0
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ENTRY(irq_entries_start)
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.rept NR_IRQS
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ALIGN
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1: pushl $vector-256
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jmp common_interrupt
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.data
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.long 1b
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.text
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vector=vector+1
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.endr
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ALIGN
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common_interrupt:
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SAVE_ALL
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movl %esp,%eax
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call do_IRQ
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jmp ret_from_intr
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#define BUILD_INTERRUPT(name, nr) \
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ENTRY(name) \
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pushl $nr-256; \
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SAVE_ALL \
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movl %esp,%eax; \
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call smp_/**/name; \
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jmp ret_from_intr;
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/* The include is where all of the SMP etc. interrupts come from */
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#include "entry_arch.h"
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ENTRY(divide_error)
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pushl $0 # no error code
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pushl $do_divide_error
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ALIGN
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error_code:
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pushl %ds
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pushl %eax
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xorl %eax, %eax
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pushl %ebp
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pushl %edi
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pushl %esi
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pushl %edx
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decl %eax # eax = -1
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pushl %ecx
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pushl %ebx
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cld
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pushl %es
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UNWIND_ESPFIX_STACK
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popl %ecx
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movl ES(%esp), %edi # get the function address
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movl ORIG_EAX(%esp), %edx # get the error code
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movl %eax, ORIG_EAX(%esp)
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movl %ecx, ES(%esp)
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movl $(__USER_DS), %ecx
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movl %ecx, %ds
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movl %ecx, %es
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movl %esp,%eax # pt_regs pointer
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call *%edi
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jmp ret_from_exception
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ENTRY(coprocessor_error)
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pushl $0
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pushl $do_coprocessor_error
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jmp error_code
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ENTRY(simd_coprocessor_error)
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pushl $0
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pushl $do_simd_coprocessor_error
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jmp error_code
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ENTRY(device_not_available)
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pushl $-1 # mark this as an int
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SAVE_ALL
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movl %cr0, %eax
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testl $0x4, %eax # EM (math emulation bit)
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jne device_not_available_emulate
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preempt_stop
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call math_state_restore
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jmp ret_from_exception
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device_not_available_emulate:
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pushl $0 # temporary storage for ORIG_EIP
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call math_emulate
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addl $4, %esp
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jmp ret_from_exception
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/*
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* Debug traps and NMI can happen at the one SYSENTER instruction
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* that sets up the real kernel stack. Check here, since we can't
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* allow the wrong stack to be used.
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*
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* "TSS_sysenter_esp0+12" is because the NMI/debug handler will have
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* already pushed 3 words if it hits on the sysenter instruction:
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* eflags, cs and eip.
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*
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* We just load the right stack, and push the three (known) values
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* by hand onto the new stack - while updating the return eip past
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* the instruction that would have done it for sysenter.
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*/
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#define FIX_STACK(offset, ok, label) \
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cmpw $__KERNEL_CS,4(%esp); \
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jne ok; \
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label: \
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movl TSS_sysenter_esp0+offset(%esp),%esp; \
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pushfl; \
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pushl $__KERNEL_CS; \
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pushl $sysenter_past_esp
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ENTRY(debug)
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cmpl $sysenter_entry,(%esp)
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jne debug_stack_correct
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FIX_STACK(12, debug_stack_correct, debug_esp_fix_insn)
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debug_stack_correct:
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pushl $-1 # mark this as an int
|
|
SAVE_ALL
|
|
xorl %edx,%edx # error code 0
|
|
movl %esp,%eax # pt_regs pointer
|
|
call do_debug
|
|
jmp ret_from_exception
|
|
|
|
/*
|
|
* NMI is doubly nasty. It can happen _while_ we're handling
|
|
* a debug fault, and the debug fault hasn't yet been able to
|
|
* clear up the stack. So we first check whether we got an
|
|
* NMI on the sysenter entry path, but after that we need to
|
|
* check whether we got an NMI on the debug path where the debug
|
|
* fault happened on the sysenter path.
|
|
*/
|
|
ENTRY(nmi)
|
|
pushl %eax
|
|
movl %ss, %eax
|
|
cmpw $__ESPFIX_SS, %ax
|
|
popl %eax
|
|
je nmi_16bit_stack
|
|
cmpl $sysenter_entry,(%esp)
|
|
je nmi_stack_fixup
|
|
pushl %eax
|
|
movl %esp,%eax
|
|
/* Do not access memory above the end of our stack page,
|
|
* it might not exist.
|
|
*/
|
|
andl $(THREAD_SIZE-1),%eax
|
|
cmpl $(THREAD_SIZE-20),%eax
|
|
popl %eax
|
|
jae nmi_stack_correct
|
|
cmpl $sysenter_entry,12(%esp)
|
|
je nmi_debug_stack_check
|
|
nmi_stack_correct:
|
|
pushl %eax
|
|
SAVE_ALL
|
|
xorl %edx,%edx # zero error code
|
|
movl %esp,%eax # pt_regs pointer
|
|
call do_nmi
|
|
jmp restore_all
|
|
|
|
nmi_stack_fixup:
|
|
FIX_STACK(12,nmi_stack_correct, 1)
|
|
jmp nmi_stack_correct
|
|
nmi_debug_stack_check:
|
|
cmpw $__KERNEL_CS,16(%esp)
|
|
jne nmi_stack_correct
|
|
cmpl $debug - 1,(%esp)
|
|
jle nmi_stack_correct
|
|
cmpl $debug_esp_fix_insn,(%esp)
|
|
jle nmi_debug_stack_fixup
|
|
nmi_debug_stack_fixup:
|
|
FIX_STACK(24,nmi_stack_correct, 1)
|
|
jmp nmi_stack_correct
|
|
|
|
nmi_16bit_stack:
|
|
/* create the pointer to lss back */
|
|
pushl %ss
|
|
pushl %esp
|
|
movzwl %sp, %esp
|
|
addw $4, (%esp)
|
|
/* copy the iret frame of 12 bytes */
|
|
.rept 3
|
|
pushl 16(%esp)
|
|
.endr
|
|
pushl %eax
|
|
SAVE_ALL
|
|
FIXUP_ESPFIX_STACK # %eax == %esp
|
|
xorl %edx,%edx # zero error code
|
|
call do_nmi
|
|
RESTORE_REGS
|
|
lss 12+4(%esp), %esp # back to 16bit stack
|
|
1: iret
|
|
.section __ex_table,"a"
|
|
.align 4
|
|
.long 1b,iret_exc
|
|
.previous
|
|
|
|
ENTRY(int3)
|
|
pushl $-1 # mark this as an int
|
|
SAVE_ALL
|
|
xorl %edx,%edx # zero error code
|
|
movl %esp,%eax # pt_regs pointer
|
|
call do_int3
|
|
jmp ret_from_exception
|
|
|
|
ENTRY(overflow)
|
|
pushl $0
|
|
pushl $do_overflow
|
|
jmp error_code
|
|
|
|
ENTRY(bounds)
|
|
pushl $0
|
|
pushl $do_bounds
|
|
jmp error_code
|
|
|
|
ENTRY(invalid_op)
|
|
pushl $0
|
|
pushl $do_invalid_op
|
|
jmp error_code
|
|
|
|
ENTRY(coprocessor_segment_overrun)
|
|
pushl $0
|
|
pushl $do_coprocessor_segment_overrun
|
|
jmp error_code
|
|
|
|
ENTRY(invalid_TSS)
|
|
pushl $do_invalid_TSS
|
|
jmp error_code
|
|
|
|
ENTRY(segment_not_present)
|
|
pushl $do_segment_not_present
|
|
jmp error_code
|
|
|
|
ENTRY(stack_segment)
|
|
pushl $do_stack_segment
|
|
jmp error_code
|
|
|
|
ENTRY(general_protection)
|
|
pushl $do_general_protection
|
|
jmp error_code
|
|
|
|
ENTRY(alignment_check)
|
|
pushl $do_alignment_check
|
|
jmp error_code
|
|
|
|
ENTRY(page_fault)
|
|
pushl $do_page_fault
|
|
jmp error_code
|
|
|
|
#ifdef CONFIG_X86_MCE
|
|
ENTRY(machine_check)
|
|
pushl $0
|
|
pushl machine_check_vector
|
|
jmp error_code
|
|
#endif
|
|
|
|
ENTRY(spurious_interrupt_bug)
|
|
pushl $0
|
|
pushl $do_spurious_interrupt_bug
|
|
jmp error_code
|
|
|
|
#include "syscall_table.S"
|
|
|
|
syscall_table_size=(.-sys_call_table)
|