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#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; |
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ENTRY(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 */ |
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(sys_call_table)[EAX](); |
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ALIGN .globl ret_from_sys_call .globl ret_from_intr ret_from_sys_call: movl SYMBOL_NAME(bh_mask),%eax andl SYMBOL_NAME(bh_active),%eax jne handle_bottom_half |
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ret_with_reschedule: cmpl $0,need_resched(%ebx)/*檢查進程是否為再次調度做了標記*/ jne reschedule/*如果是,就跳轉到reschedule*/ cmpl $0,sigpending(%ebx)/*檢查是否還有掛起信號*/ jne signal_return/*如果有,則程序跳轉到signal_return*/ restore_all: RESTORE_ALL/*system_call的退出點,參看前面SAVE_ALL的用法*/ |
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ALIGN v86_signal_return: call SYMBOL_NAME(save_v86_state) movl %eax,%esp xorl %edx,%edx call SYMBOL_NAME(do_signal) jmp restore_all |
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movl $-ENOSYS,EAX(%esp) /*system_call把存儲在堆棧中的EAX拷貝賦予-ENOSYS。*/ call SYMBOL_NAME(syscall_trace) /*調用syscall_trace*/ movl ORIG_EAX(%esp),%eax /*在172行再從所作的拷貝中恢復EAX的值*/ call *SYMBOL_NAME(sys_call_table)(,%eax,4) /*調用實際的系統調用。*/ movl %eax,EAX(%esp)/*把系統調用的返回值置入堆棧中EAX的位置。*/ call SYMBOL_NAME(syscall_trace) /*再次調用syscall_trace*/ jmp ret_from_sys_call /*被跟蹤的系統調用已經返回,控制流程跳轉到ret_from_sys_call*/ badsys: /*前面說過,當系統調用數超過邊界值時程序就跳轉到這裡。*/ movl $-ENOSYS,EAX(%esp) /*這時system_call必須返回-ENOSYS,82行把ENOSYS賦值為38。調用 者會識別這個錯誤*/ jmp ret_from_sys_call /*跳轉到ret_from_sys_call*/ |
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movl SYMBOL_NAME(bh_mask),%eax andl SYMBOL_NAME(bh_active),%eax jne handle_bottom_half ALIGN ret_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 ALIGN handle_bottom_half: call SYMBOL_NAME(do_bottom_half) jmp ret_from_intr ALIGN reschedule: call SYMBOL_NAME(schedule) # test jmp ret_from_sys_call |
[火星人 ] Linux內核分析--系統調用實現代碼分析已經有694次圍觀