670 lines
15 KiB
ArmAsm
670 lines
15 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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testl $TF_MASK,EFLAGS(%esp)
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jz no_singlestep
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orl $_TIF_SINGLESTEP,TI_flags(%ebp)
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no_singlestep:
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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 resume_userspace
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ALIGN
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work_notifysig_v86:
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#ifdef CONFIG_VM86
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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 resume_userspace
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#endif
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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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KPROBE_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
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SAVE_ALL
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xorl %edx,%edx # error code 0
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movl %esp,%eax # pt_regs pointer
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call do_debug
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jmp ret_from_exception
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.previous .text
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/*
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* 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,(%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_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
|
|
|
|
KPROBE_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
|
|
.previous .text
|
|
|
|
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
|
|
|
|
KPROBE_ENTRY(general_protection)
|
|
pushl $do_general_protection
|
|
jmp error_code
|
|
.previous .text
|
|
|
|
ENTRY(alignment_check)
|
|
pushl $do_alignment_check
|
|
jmp error_code
|
|
|
|
KPROBE_ENTRY(page_fault)
|
|
pushl $do_page_fault
|
|
jmp error_code
|
|
.previous .text
|
|
|
|
#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
|
|
|
|
.section .rodata,"a"
|
|
#include "syscall_table.S"
|
|
|
|
syscall_table_size=(.-sys_call_table)
|