?? entry.s
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/* * 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 'ret_from_system_call': * 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) - orig_eax * 28(%esp) - %eip * 2C(%esp) - %cs * 30(%esp) - %eflags * 34(%esp) - %oldesp * 38(%esp) - %oldss * * "current" is in register %ebx during any slow entries. */#include <linux/sys.h>#include <linux/linkage.h>#include <asm/segment.h>#define ASSEMBLY#include <asm/smp.h>EBX = 0x00ECX = 0x04EDX = 0x08ESI = 0x0CEDI = 0x10EBP = 0x14EAX = 0x18DS = 0x1CES = 0x20ORIG_EAX = 0x24EIP = 0x28CS = 0x2CEFLAGS = 0x30OLDESP = 0x34OLDSS = 0x38CF_MASK = 0x00000001IF_MASK = 0x00000200NT_MASK = 0x00004000VM_MASK = 0x00020000/* * these are offsets into the task-struct. */state = 0flags = 4sigpending = 8addr_limit = 12exec_domain = 16need_resched = 20ENOSYS = 38#define SAVE_ALL \ cld; \ pushl %es; \ pushl %ds; \ pushl %eax; \ pushl %ebp; \ pushl %edi; \ pushl %esi; \ pushl %edx; \ pushl %ecx; \ pushl %ebx; \ movl $(__KERNEL_DS),%edx; \ movl %dx,%ds; \ movl %dx,%es;#define RESTORE_ALL \ popl %ebx; \ popl %ecx; \ popl %edx; \ popl %esi; \ popl %edi; \ popl %ebp; \ popl %eax; \1: popl %ds; \2: popl %es; \ addl $4,%esp; \3: iret; \.section .fixup,"ax"; \4: movl $0,(%esp); \ jmp 1b; \5: movl $0,(%esp); \ jmp 2b; \6: pushl %ss; \ popl %ds; \ pushl %ss; \ popl %es; \ pushl $11; \ call do_exit; \.previous; \.section __ex_table,"a";\ .align 4; \ .long 1b,4b; \ .long 2b,5b; \ .long 3b,6b; \.previous#define GET_CURRENT(reg) \ movl %esp, reg; \ andl $-8192, reg;ENTRY(lcall7) pushfl # We get a different stack layout with call gates, pushl %eax # which has to be cleaned up later.. SAVE_ALL movl EIP(%esp),%eax # due to call gates, this is eflags, not eip.. movl CS(%esp),%edx # this is eip.. movl EFLAGS(%esp),%ecx # and this is cs.. movl %eax,EFLAGS(%esp) # movl %edx,EIP(%esp) # Now we move them to their "normal" places movl %ecx,CS(%esp) # movl %esp,%ebx pushl %ebx andl $-8192,%ebx # GET_CURRENT movl exec_domain(%ebx),%edx # Get the execution domain movl 4(%edx),%edx # Get the lcall7 handler for the domain call *%edx popl %eax jmp ret_from_sys_call ALIGN .globl ret_from_forkret_from_fork:#ifdef __SMP__ pushl %ebx call SYMBOL_NAME(schedule_tail) addl $4, %esp#endif /* __SMP__ */ GET_CURRENT(%ebx) jmp ret_from_sys_call/* * 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. */ENTRY(system_call) pushl %eax # save orig_eax SAVE_ALL GET_CURRENT(%ebx) cmpl $(NR_syscalls),%eax jae badsys testb $0x20,flags(%ebx) # PF_TRACESYS jne tracesys call *SYMBOL_NAME(sys_call_table)(,%eax,4) movl %eax,EAX(%esp) # save the return value ALIGN .globl ret_from_sys_call .globl ret_from_intrret_from_sys_call: movl SYMBOL_NAME(bh_mask),%eax andl SYMBOL_NAME(bh_active),%eax jne handle_bottom_halfret_with_reschedule: cmpl $0,need_resched(%ebx) jne reschedule cmpl $0,sigpending(%ebx) jne signal_returnrestore_all: RESTORE_ALL ALIGNsignal_return: sti # we can get here from an interrupt handler testl $(VM_MASK),EFLAGS(%esp) movl %esp,%eax jne v86_signal_return xorl %edx,%edx call SYMBOL_NAME(do_signal) jmp restore_all ALIGNv86_signal_return: call SYMBOL_NAME(save_v86_state) movl %eax,%esp xorl %edx,%edx call SYMBOL_NAME(do_signal) jmp restore_all ALIGNtracesys: movl $-ENOSYS,EAX(%esp) call SYMBOL_NAME(syscall_trace) movl ORIG_EAX(%esp),%eax call *SYMBOL_NAME(sys_call_table)(,%eax,4) movl %eax,EAX(%esp) # save the return value call SYMBOL_NAME(syscall_trace) jmp ret_from_sys_callbadsys: movl $-ENOSYS,EAX(%esp) jmp ret_from_sys_call ALIGNret_from_exception: movl SYMBOL_NAME(bh_mask),%eax andl SYMBOL_NAME(bh_active),%eax jne handle_bottom_half ALIGNret_from_intr: GET_CURRENT(%ebx) movl EFLAGS(%esp),%eax # mix EFLAGS and CS movb CS(%esp),%al testl $(VM_MASK | 3),%eax # return to VM86 mode or non-supervisor? jne ret_with_reschedule jmp restore_all ALIGNhandle_bottom_half: call SYMBOL_NAME(do_bottom_half) jmp ret_from_intr ALIGNreschedule: call SYMBOL_NAME(schedule) # test jmp ret_from_sys_callENTRY(divide_error) pushl $0 # no error code pushl $ SYMBOL_NAME(do_divide_error) ALIGNerror_code: pushl %ds pushl %eax xorl %eax,%eax pushl %ebp pushl %edi pushl %esi pushl %edx decl %eax # eax = -1 pushl %ecx pushl %ebx cld movl %es,%cx xchgl %eax, ORIG_EAX(%esp) # orig_eax (get the error code. ) movl %esp,%edx xchgl %ecx, ES(%esp) # get the address and save es. pushl %eax # push the error code pushl %edx movl $(__KERNEL_DS),%edx movl %dx,%ds movl %dx,%es GET_CURRENT(%ebx) call *%ecx addl $8,%esp jmp ret_from_exceptionENTRY(coprocessor_error) pushl $0 pushl $ SYMBOL_NAME(do_coprocessor_error) jmp error_codeENTRY(device_not_available) pushl $-1 # mark this as an int SAVE_ALL GET_CURRENT(%ebx) pushl $ret_from_exception movl %cr0,%eax testl $0x4,%eax # EM (math emulation bit) je SYMBOL_NAME(math_state_restore) pushl $0 # temporary storage for ORIG_EIP call SYMBOL_NAME(math_emulate) addl $4,%esp retENTRY(debug) pushl $0 pushl $ SYMBOL_NAME(do_debug) jmp error_codeENTRY(nmi) pushl $0 pushl $ SYMBOL_NAME(do_nmi) jmp error_codeENTRY(int3) pushl $0 pushl $ SYMBOL_NAME(do_int3) jmp error_codeENTRY(overflow) pushl $0 pushl $ SYMBOL_NAME(do_overflow) jmp error_codeENTRY(bounds) pushl $0 pushl $ SYMBOL_NAME(do_bounds) jmp error_codeENTRY(invalid_op) pushl $0 pushl $ SYMBOL_NAME(do_invalid_op) jmp error_codeENTRY(coprocessor_segment_overrun) pushl $0 pushl $ SYMBOL_NAME(do_coprocessor_segment_overrun) jmp error_codeENTRY(reserved) pushl $0 pushl $ SYMBOL_NAME(do_reserved) jmp error_codeENTRY(double_fault) pushl $ SYMBOL_NAME(do_double_fault) jmp error_codeENTRY(invalid_TSS) pushl $ SYMBOL_NAME(do_invalid_TSS) jmp error_codeENTRY(segment_not_present) pushl $ SYMBOL_NAME(do_segment_not_present) jmp error_codeENTRY(stack_segment) pushl $ SYMBOL_NAME(do_stack_segment) jmp error_codeENTRY(general_protection) pushl $ SYMBOL_NAME(do_general_protection) jmp error_codeENTRY(alignment_check) pushl $ SYMBOL_NAME(do_alignment_check) jmp error_codeENTRY(page_fault) pushl $ SYMBOL_NAME(do_page_fault) jmp error_codeENTRY(spurious_interrupt_bug) pushl $0 pushl $ SYMBOL_NAME(do_spurious_interrupt_bug) jmp error_code.dataENTRY(sys_call_table) .long SYMBOL_NAME(sys_ni_syscall) /* 0 - old "setup()" system call*/ .long SYMBOL_NAME(sys_exit) .long SYMBOL_NAME(sys_fork) .long SYMBOL_NAME(sys_read) .long SYMBOL_NAME(sys_write) .long SYMBOL_NAME(sys_open) /* 5 */ .long SYMBOL_NAME(sys_close) .long SYMBOL_NAME(sys_waitpid) .long SYMBOL_NAME(sys_creat) .long SYMBOL_NAME(sys_link) .long SYMBOL_NAME(sys_unlink) /* 10 */ .long SYMBOL_NAME(sys_execve) .long SYMBOL_NAME(sys_chdir) .long SYMBOL_NAME(sys_time) .long SYMBOL_NAME(sys_mknod) .long SYMBOL_NAME(sys_chmod) /* 15 */ .long SYMBOL_NAME(sys_lchown) .long SYMBOL_NAME(sys_ni_syscall) /* old break syscall holder */ .long SYMBOL_NAME(sys_stat) .long SYMBOL_NAME(sys_lseek) .long SYMBOL_NAME(sys_getpid) /* 20 */ .long SYMBOL_NAME(sys_mount) .long SYMBOL_NAME(sys_oldumount) .long SYMBOL_NAME(sys_setuid) .long SYMBOL_NAME(sys_getuid) .long SYMBOL_NAME(sys_stime) /* 25 */ .long SYMBOL_NAME(sys_ptrace) .long SYMBOL_NAME(sys_alarm) .long SYMBOL_NAME(sys_fstat) .long SYMBOL_NAME(sys_pause) .long SYMBOL_NAME(sys_utime) /* 30 */ .long SYMBOL_NAME(sys_ni_syscall) /* old stty syscall holder */ .long SYMBOL_NAME(sys_ni_syscall) /* old gtty syscall holder */ .long SYMBOL_NAME(sys_access) .long SYMBOL_NAME(sys_nice) .long SYMBOL_NAME(sys_ni_syscall) /* 35 */ /* old ftime syscall holder */ .long SYMBOL_NAME(sys_sync) .long SYMBOL_NAME(sys_kill) .long SYMBOL_NAME(sys_rename) .long SYMBOL_NAME(sys_mkdir) .long SYMBOL_NAME(sys_rmdir) /* 40 */ .long SYMBOL_NAME(sys_dup) .long SYMBOL_NAME(sys_pipe) .long SYMBOL_NAME(sys_times) .long SYMBOL_NAME(sys_ni_syscall) /* old prof syscall holder */ .long SYMBOL_NAME(sys_brk) /* 45 */ .long SYMBOL_NAME(sys_setgid) .long SYMBOL_NAME(sys_getgid) .long SYMBOL_NAME(sys_signal) .long SYMBOL_NAME(sys_geteuid) .long SYMBOL_NAME(sys_getegid) /* 50 */ .long SYMBOL_NAME(sys_acct) .long SYMBOL_NAME(sys_umount) /* recycled never used phys() */ .long SYMBOL_NAME(sys_ni_syscall) /* old lock syscall holder */ .long SYMBOL_NAME(sys_ioctl) .long SYMBOL_NAME(sys_fcntl) /* 55 */ .long SYMBOL_NAME(sys_ni_syscall) /* old mpx syscall holder */ .long SYMBOL_NAME(sys_setpgid) .long SYMBOL_NAME(sys_ni_syscall) /* old ulimit syscall holder */ .long SYMBOL_NAME(sys_olduname) .long SYMBOL_NAME(sys_umask) /* 60 */ .long SYMBOL_NAME(sys_chroot) .long SYMBOL_NAME(sys_ustat) .long SYMBOL_NAME(sys_dup2) .long SYMBOL_NAME(sys_getppid) .long SYMBOL_NAME(sys_getpgrp) /* 65 */ .long SYMBOL_NAME(sys_setsid) .long SYMBOL_NAME(sys_sigaction) .long SYMBOL_NAME(sys_sgetmask) .long SYMBOL_NAME(sys_ssetmask) .long SYMBOL_NAME(sys_setreuid) /* 70 */ .long SYMBOL_NAME(sys_setregid) .long SYMBOL_NAME(sys_sigsuspend) .long SYMBOL_NAME(sys_sigpending) .long SYMBOL_NAME(sys_sethostname) .long SYMBOL_NAME(sys_setrlimit) /* 75 */ .long SYMBOL_NAME(sys_getrlimit) .long SYMBOL_NAME(sys_getrusage) .long SYMBOL_NAME(sys_gettimeofday) .long SYMBOL_NAME(sys_settimeofday) .long SYMBOL_NAME(sys_getgroups) /* 80 */ .long SYMBOL_NAME(sys_setgroups) .long SYMBOL_NAME(old_select) .long SYMBOL_NAME(sys_symlink) .long SYMBOL_NAME(sys_lstat) .long SYMBOL_NAME(sys_readlink) /* 85 */ .long SYMBOL_NAME(sys_uselib) .long SYMBOL_NAME(sys_swapon) .long SYMBOL_NAME(sys_reboot) .long SYMBOL_NAME(old_readdir) .long SYMBOL_NAME(old_mmap) /* 90 */ .long SYMBOL_NAME(sys_munmap) .long SYMBOL_NAME(sys_truncate) .long SYMBOL_NAME(sys_ftruncate) .long SYMBOL_NAME(sys_fchmod) .long SYMBOL_NAME(sys_fchown) /* 95 */ .long SYMBOL_NAME(sys_getpriority) .long SYMBOL_NAME(sys_setpriority) .long SYMBOL_NAME(sys_ni_syscall) /* old profil syscall holder */ .long SYMBOL_NAME(sys_statfs) .long SYMBOL_NAME(sys_fstatfs) /* 100 */ .long SYMBOL_NAME(sys_ioperm) .long SYMBOL_NAME(sys_socketcall) .long SYMBOL_NAME(sys_syslog) .long SYMBOL_NAME(sys_setitimer) .long SYMBOL_NAME(sys_getitimer) /* 105 */ .long SYMBOL_NAME(sys_newstat) .long SYMBOL_NAME(sys_newlstat) .long SYMBOL_NAME(sys_newfstat) .long SYMBOL_NAME(sys_uname) .long SYMBOL_NAME(sys_iopl) /* 110 */ .long SYMBOL_NAME(sys_vhangup) .long SYMBOL_NAME(sys_idle) .long SYMBOL_NAME(sys_vm86old) .long SYMBOL_NAME(sys_wait4) .long SYMBOL_NAME(sys_swapoff) /* 115 */ .long SYMBOL_NAME(sys_sysinfo) .long SYMBOL_NAME(sys_ipc) .long SYMBOL_NAME(sys_fsync) .long SYMBOL_NAME(sys_sigreturn) .long SYMBOL_NAME(sys_clone) /* 120 */ .long SYMBOL_NAME(sys_setdomainname) .long SYMBOL_NAME(sys_newuname) .long SYMBOL_NAME(sys_modify_ldt) .long SYMBOL_NAME(sys_adjtimex) .long SYMBOL_NAME(sys_mprotect) /* 125 */ .long SYMBOL_NAME(sys_sigprocmask) .long SYMBOL_NAME(sys_create_module) .long SYMBOL_NAME(sys_init_module) .long SYMBOL_NAME(sys_delete_module) .long SYMBOL_NAME(sys_get_kernel_syms) /* 130 */ .long SYMBOL_NAME(sys_quotactl) .long SYMBOL_NAME(sys_getpgid) .long SYMBOL_NAME(sys_fchdir) .long SYMBOL_NAME(sys_bdflush) .long SYMBOL_NAME(sys_sysfs) /* 135 */ .long SYMBOL_NAME(sys_personality) .long SYMBOL_NAME(sys_ni_syscall) /* for afs_syscall */ .long SYMBOL_NAME(sys_setfsuid) .long SYMBOL_NAME(sys_setfsgid) .long SYMBOL_NAME(sys_llseek) /* 140 */ .long SYMBOL_NAME(sys_getdents) .long SYMBOL_NAME(sys_select) .long SYMBOL_NAME(sys_flock) .long SYMBOL_NAME(sys_msync) .long SYMBOL_NAME(sys_readv) /* 145 */ .long SYMBOL_NAME(sys_writev) .long SYMBOL_NAME(sys_getsid) .long SYMBOL_NAME(sys_fdatasync) .long SYMBOL_NAME(sys_sysctl) .long SYMBOL_NAME(sys_mlock) /* 150 */ .long SYMBOL_NAME(sys_munlock) .long SYMBOL_NAME(sys_mlockall) .long SYMBOL_NAME(sys_munlockall) .long SYMBOL_NAME(sys_sched_setparam) .long SYMBOL_NAME(sys_sched_getparam) /* 155 */ .long SYMBOL_NAME(sys_sched_setscheduler) .long SYMBOL_NAME(sys_sched_getscheduler) .long SYMBOL_NAME(sys_sched_yield) .long SYMBOL_NAME(sys_sched_get_priority_max) .long SYMBOL_NAME(sys_sched_get_priority_min) /* 160 */ .long SYMBOL_NAME(sys_sched_rr_get_interval) .long SYMBOL_NAME(sys_nanosleep) .long SYMBOL_NAME(sys_mremap) .long SYMBOL_NAME(sys_setresuid) .long SYMBOL_NAME(sys_getresuid) /* 165 */ .long SYMBOL_NAME(sys_vm86) .long SYMBOL_NAME(sys_query_module) .long SYMBOL_NAME(sys_poll) .long SYMBOL_NAME(sys_nfsservctl) .long SYMBOL_NAME(sys_setresgid) /* 170 */ .long SYMBOL_NAME(sys_getresgid) .long SYMBOL_NAME(sys_prctl) .long SYMBOL_NAME(sys_rt_sigreturn) .long SYMBOL_NAME(sys_rt_sigaction) .long SYMBOL_NAME(sys_rt_sigprocmask) /* 175 */ .long SYMBOL_NAME(sys_rt_sigpending) .long SYMBOL_NAME(sys_rt_sigtimedwait) .long SYMBOL_NAME(sys_rt_sigqueueinfo) .long SYMBOL_NAME(sys_rt_sigsuspend) .long SYMBOL_NAME(sys_pread) /* 180 */ .long SYMBOL_NAME(sys_pwrite) .long SYMBOL_NAME(sys_chown) .long SYMBOL_NAME(sys_getcwd) .long SYMBOL_NAME(sys_capget) .long SYMBOL_NAME(sys_capset) /* 185 */ .long SYMBOL_NAME(sys_sigaltstack) .long SYMBOL_NAME(sys_sendfile) .long SYMBOL_NAME(sys_ni_syscall) /* streams1 */ .long SYMBOL_NAME(sys_ni_syscall) /* streams2 */ .long SYMBOL_NAME(sys_vfork) /* 190 */ .long SYMBOL_NAME(sys_mycall) /* * NOTE!! This doesn't have to be exact - we just have * to make sure we have _enough_ of the "sys_ni_syscall" * entries. Don't panic if you notice that this hasn't * been shrunk every time we add a new system call. */ .rept NR_syscalls-191 .long SYMBOL_NAME(sys_ni_syscall) .endr?? 快捷鍵說明
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