entry.s

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

# a new process exits the kernel with ret_from_fork
#
        .globl  ret_from_fork
ret_from_fork:  
        basr    %r13,0
        ahi     %r13,sysc_lit-.   # setup base pointer R13 to $SYSCDAT
        GET_CURRENT               # load pointer to task_struct to R9
        stosm   24(%r15),0x03     # reenable interrupts
        sr      %r0,%r0           # child returns 0
        st      %r0,SP_R2(%r15)   # store return value (change R2 on stack)
#ifdef CONFIG_SMP
        l       %r1,sysc_schedtail-sysc_lit(%r13)
	la      %r14,sysc_return-sysc_lit(%r13)
        br      %r1               # call schedule_tail, return to sysc_return
#else
        j       sysc_return
#endif

#
# clone, fork, vfork, exec and sigreturn need glue,
# because they all expect pt_regs as parameter,
# but are called with different parameter.
# return-address is set up above
#
sys_clone_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        l       %r1,sysc_clone-sysc_lit(%r13)
        br      %r1                   # branch to sys_clone

sys_fork_glue:  
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        l       %r1,sysc_fork-sysc_lit(%r13)
        br      %r1                   # branch to sys_fork

sys_vfork_glue: 
        la      %r2,SP_PTREGS(%r15)    # load pt_regs
        l       %r1,sysc_vfork-sysc_lit(%r13)
        br      %r1                   # branch to sys_vfork

sys_execve_glue:        
        la      %r2,SP_PTREGS(%r15)   # load pt_regs
        l       %r1,sysc_execve-sysc_lit(%r13)
	lr      %r12,%r14             # save return address
        basr    %r14,%r1              # call sys_execve
        ltr     %r2,%r2               # check if execve failed
        bnz     0(%r12)               # it did fail -> store result in gpr2
        b       4(%r12)               # SKIP ST 2,SP_R2(15) after BASR 14,8
                                      # in system_call/sysc_tracesys

sys_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        l       %r1,sysc_sigreturn-sysc_lit(%r13)
        br      %r1                   # branch to sys_sigreturn

sys_rt_sigreturn_glue:     
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as parameter
        l       %r1,sysc_rt_sigreturn-sysc_lit(%r13)
        br      %r1                   # branch to sys_sigreturn

#
# sigsuspend and rt_sigsuspend need pt_regs as an additional
# parameter and they have to skip the store of %r2 into the
# user register %r2 because the return value was set in 
# sigsuspend and rt_sigsuspend already and must not be overwritten!
#

sys_sigsuspend_glue:    
        lr      %r5,%r4               # move mask back
        lr      %r4,%r3               # move history1 parameter
        lr      %r3,%r2               # move history0 parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
        l       %r1,sysc_sigsuspend-sysc_lit(%r13)
	la      %r14,4(%r14)          # skip store of return value
        br      %r1                   # branch to sys_sigsuspend

sys_rt_sigsuspend_glue: 
        lr      %r4,%r3               # move sigsetsize parameter
        lr      %r3,%r2               # move unewset parameter
        la      %r2,SP_PTREGS(%r15)   # load pt_regs as first parameter
        l       %r1,sysc_rt_sigsuspend-sysc_lit(%r13)
	la      %r14,4(%r14)          # skip store of return value
        br      %r1                   # branch to sys_rt_sigsuspend

	.globl  sys_call_table	
sys_call_table:
        .long  sys_ni_syscall            /* 0 */
        .long  sys_exit
        .long  sys_fork_glue
        .long  sys_read
        .long  sys_write
        .long  sys_open                  /* 5 */
        .long  sys_close
        .long  sys_ni_syscall           /* old waitpid syscall holder */
        .long  sys_creat
        .long  sys_link
        .long  sys_unlink                /* 10 */
        .long  sys_execve_glue
        .long  sys_chdir
        .long  sys_time
        .long  sys_mknod
        .long  sys_chmod                /* 15 */
        .long  sys_lchown16
        .long  sys_ni_syscall           /* old break syscall holder */
        .long  sys_ni_syscall           /* old stat syscall holder */
        .long  sys_lseek
        .long  sys_getpid               /* 20 */
        .long  sys_mount
        .long  sys_oldumount
        .long  sys_setuid16
        .long  sys_getuid16
        .long  sys_stime                /* 25 */
        .long  sys_ptrace
        .long  sys_alarm
        .long  sys_ni_syscall           /* old fstat syscall holder */
        .long  sys_pause
        .long  sys_utime                /* 30 */
        .long  sys_ni_syscall           /* old stty syscall holder */
        .long  sys_ni_syscall           /* old gtty syscall holder */
        .long  sys_access
        .long  sys_nice
        .long  sys_ni_syscall           /* 35 */  /* old ftime syscall holder */
        .long  sys_sync
        .long  sys_kill
        .long  sys_rename
        .long  sys_mkdir
        .long  sys_rmdir                /* 40 */
        .long  sys_dup
        .long  sys_pipe
        .long  sys_times
        .long  sys_ni_syscall           /* old prof syscall holder */
        .long  sys_brk                  /* 45 */
        .long  sys_setgid16
        .long  sys_getgid16
        .long  sys_signal
        .long  sys_geteuid16
        .long  sys_getegid16            /* 50 */
        .long  sys_acct
        .long  sys_umount
        .long  sys_ni_syscall           /* old lock syscall holder */
        .long  sys_ioctl
        .long  sys_fcntl                /* 55 */
        .long  sys_ni_syscall           /* old mpx syscall holder */
        .long  sys_setpgid
        .long  sys_ni_syscall           /* old ulimit syscall holder */
        .long  sys_ni_syscall           /* old uname syscall holder */
        .long  sys_umask                /* 60 */
        .long  sys_chroot
        .long  sys_ustat
        .long  sys_dup2
        .long  sys_getppid
        .long  sys_getpgrp              /* 65 */
        .long  sys_setsid
        .long  sys_sigaction
        .long  sys_ni_syscall           /* old sgetmask syscall holder */
        .long  sys_ni_syscall           /* old ssetmask syscall holder */
        .long  sys_setreuid16           /* 70 */
        .long  sys_setregid16
        .long  sys_sigsuspend_glue
        .long  sys_sigpending
        .long  sys_sethostname
        .long  sys_setrlimit            /* 75 */
        .long  sys_getrlimit
        .long  sys_getrusage
        .long  sys_gettimeofday
        .long  sys_settimeofday
        .long  sys_getgroups16          /* 80 */
        .long  sys_setgroups16
        .long  sys_ni_syscall           /* old select syscall holder */
        .long  sys_symlink
        .long  sys_ni_syscall           /* old lstat syscall holder */
        .long  sys_readlink             /* 85 */
        .long  sys_uselib
        .long  sys_swapon
        .long  sys_reboot
        .long  sys_ni_syscall           /* old readdir syscall holder */
        .long  old_mmap                 /* 90 */
        .long  sys_munmap
        .long  sys_truncate
        .long  sys_ftruncate
        .long  sys_fchmod
        .long  sys_fchown16              /* 95 */
        .long  sys_getpriority
        .long  sys_setpriority
        .long  sys_ni_syscall            /* old profil syscall holder */
        .long  sys_statfs
        .long  sys_fstatfs               /* 100 */
        .long  sys_ioperm
        .long  sys_socketcall
        .long  sys_syslog
        .long  sys_setitimer
        .long  sys_getitimer             /* 105 */
        .long  sys_newstat
        .long  sys_newlstat
        .long  sys_newfstat
        .long  sys_ni_syscall            /* old uname syscall holder */
        .long  sys_ni_syscall            /* 110 */ /* iopl for i386 */
        .long  sys_vhangup
        .long  sys_ni_syscall            /* old "idle" system call */
        .long  sys_ni_syscall            /* vm86old for i386 */
        .long  sys_wait4
        .long  sys_swapoff               /* 115 */
        .long  sys_sysinfo
        .long  sys_ipc
        .long  sys_fsync
        .long  sys_sigreturn_glue
        .long  sys_clone_glue            /* 120 */
        .long  sys_setdomainname
        .long  sys_newuname
        .long  sys_ni_syscall            /* modify_ldt for i386 */
        .long  sys_adjtimex
        .long  sys_mprotect              /* 125 */
        .long  sys_sigprocmask
        .long  sys_create_module
        .long  sys_init_module
        .long  sys_delete_module
        .long  sys_get_kernel_syms       /* 130 */
        .long  sys_quotactl
        .long  sys_getpgid
        .long  sys_fchdir
        .long  sys_bdflush
        .long  sys_sysfs                 /* 135 */
        .long  sys_personality
        .long  sys_ni_syscall            /* for afs_syscall */
        .long  sys_setfsuid16
        .long  sys_setfsgid16
        .long  sys_llseek                /* 140 */
        .long  sys_getdents
        .long  sys_select
        .long  sys_flock
        .long  sys_msync
        .long  sys_readv                 /* 145 */
        .long  sys_writev
        .long  sys_getsid
        .long  sys_fdatasync
        .long  sys_sysctl
        .long  sys_mlock                 /* 150 */
        .long  sys_munlock
        .long  sys_mlockall
        .long  sys_munlockall
        .long  sys_sched_setparam
        .long  sys_sched_getparam        /* 155 */
        .long  sys_sched_setscheduler
        .long  sys_sched_getscheduler
        .long  sys_sched_yield
        .long  sys_sched_get_priority_max
        .long  sys_sched_get_priority_min  /* 160 */
        .long  sys_sched_rr_get_interval
        .long  sys_nanosleep
        .long  sys_mremap
        .long  sys_setresuid16
        .long  sys_getresuid16           /* 165 */
        .long  sys_ni_syscall            /* for vm86 */
        .long  sys_query_module
        .long  sys_poll
        .long  sys_nfsservctl
        .long  sys_setresgid16           /* 170 */
        .long  sys_getresgid16
        .long  sys_prctl
        .long  sys_rt_sigreturn_glue
        .long  sys_rt_sigaction
        .long  sys_rt_sigprocmask        /* 175 */
        .long  sys_rt_sigpending
        .long  sys_rt_sigtimedwait
        .long  sys_rt_sigqueueinfo
        .long  sys_rt_sigsuspend_glue
        .long  sys_pread                 /* 180 */
        .long  sys_pwrite
        .long  sys_chown16
        .long  sys_getcwd
        .long  sys_capget
        .long  sys_capset                /* 185 */
        .long  sys_sigaltstack
        .long  sys_sendfile
        .long  sys_ni_syscall            /* streams1 */
        .long  sys_ni_syscall            /* streams2 */
        .long  sys_vfork_glue            /* 190 */
        .long  sys_getrlimit
	.long  sys_ni_syscall  /* FIXME: problem with sys_mmap2: 6 parms */
        .long  sys_truncate64
        .long  sys_ftruncate64
        .long  sys_stat64                /* 195 */
        .long  sys_lstat64
        .long  sys_fstat64
	.long  sys_lchown
	.long  sys_getuid
	.long  sys_getgid		 /* 200 */
	.long  sys_geteuid
	.long  sys_getegid
	.long  sys_setreuid
	.long  sys_setregid
	.long  sys_getgroups             /* 205 */
	.long  sys_setgroups
	.long  sys_fchown
	.long  sys_setresuid
	.long  sys_getresuid
	.long  sys_setresgid             /* 210 */
	.long  sys_getresgid
	.long  sys_chown
	.long  sys_setuid
	.long  sys_setgid