Linux-2.6.33.2/arch/ia64/ia32/ia32_entry.S
#include <asm/asmmacro.h>
#include <asm/ia32.h>
#include <asm/asm-offsets.h>
#include <asm/signal.h>
#include <asm/thread_info.h>
#include "../kernel/minstate.h"
/*
* execve() is special because in case of success, we need to
* setup a null register window frame (in case an IA-32 process
* is exec'ing an IA-64 program).
*/
ENTRY(ia32_execve)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(3)
alloc loc1=ar.pfs,3,2,4,0
mov loc0=rp
.body
zxt4 out0=in0 // filename
;; // stop bit between alloc and call
zxt4 out1=in1 // argv
zxt4 out2=in2 // envp
add out3=16,sp // regs
br.call.sptk.few rp=sys32_execve
1: cmp.ge p6,p0=r8,r0
mov ar.pfs=loc1 // restore ar.pfs
;;
(p6) mov ar.pfs=r0 // clear ar.pfs in case of success
sxt4 r8=r8 // return 64-bit result
mov rp=loc0
br.ret.sptk.few rp
END(ia32_execve)
ENTRY(ia32_clone)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(5)
alloc r16=ar.pfs,5,2,6,0
DO_SAVE_SWITCH_STACK
mov loc0=rp
mov loc1=r16 // save ar.pfs across do_fork
.body
zxt4 out1=in1 // newsp
mov out3=16 // stacksize (compensates for 16-byte scratch area)
adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
mov out0=in0 // out0 = clone_flags
zxt4 out4=in2 // out4 = parent_tidptr
zxt4 out5=in4 // out5 = child_tidptr
br.call.sptk.many rp=do_fork
.ret0: .restore sp
adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
mov ar.pfs=loc1
mov rp=loc0
br.ret.sptk.many rp
END(ia32_clone)
GLOBAL_ENTRY(ia32_ret_from_clone)
PT_REGS_UNWIND_INFO(0)
{ /*
* Some versions of gas generate bad unwind info if the first instruction of a
* procedure doesn't go into the first slot of a bundle. This is a workaround.
*/
nop.m 0
nop.i 0
/*
* We need to call schedule_tail() to complete the scheduling process.
* Called by ia64_switch_to after do_fork()->copy_thread(). r8 contains the
* address of the previously executing task.
*/
br.call.sptk.many rp=ia64_invoke_schedule_tail
}
.ret1:
adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
;;
ld4 r2=[r2]
;;
mov r8=0
and r2=_TIF_SYSCALL_TRACEAUDIT,r2
;;
cmp.ne p6,p0=r2,r0
(p6) br.cond.spnt .ia32_strace_check_retval
;; // prevent RAW on r8
END(ia32_ret_from_clone)
// fall through
GLOBAL_ENTRY(ia32_ret_from_syscall)
PT_REGS_UNWIND_INFO(0)
cmp.ge p6,p7=r8,r0 // syscall executed successfully?
adds r2=IA64_PT_REGS_R8_OFFSET+16,sp // r2 = &pt_regs.r8
;;
alloc r3=ar.pfs,0,0,0,0 // drop the syscall argument frame
st8 [r2]=r8 // store return value in slot for r8
br.cond.sptk.many ia64_leave_kernel
END(ia32_ret_from_syscall)
//
// Invoke a system call, but do some tracing before and after the call.
// We MUST preserve the current register frame throughout this routine
// because some system calls (such as ia64_execve) directly
// manipulate ar.pfs.
//
// Input:
// r8 = syscall number
// b6 = syscall entry point
//
GLOBAL_ENTRY(ia32_trace_syscall)
PT_REGS_UNWIND_INFO(0)
mov r3=-38
adds r2=IA64_PT_REGS_R8_OFFSET+16,sp
;;
st8 [r2]=r3 // initialize return code to -ENOSYS
br.call.sptk.few rp=syscall_trace_enter // give parent a chance to catch syscall args
cmp.lt p6,p0=r8,r0 // check tracehook
adds r2=IA64_PT_REGS_R8_OFFSET+16,sp // r2 = &pt_regs.r8
;;
(p6) st8.spill [r2]=r8 // store return value in slot for r8
(p6) br.spnt.few .ret4
.ret2: // Need to reload arguments (they may be changed by the tracing process)
adds r2=IA64_PT_REGS_R1_OFFSET+16,sp // r2 = &pt_regs.r1
adds r3=IA64_PT_REGS_R13_OFFSET+16,sp // r3 = &pt_regs.r13
mov r15=IA32_NR_syscalls
;;
ld4 r8=[r2],IA64_PT_REGS_R9_OFFSET-IA64_PT_REGS_R1_OFFSET
movl r16=ia32_syscall_table
;;
ld4 r33=[r2],8 // r9 == ecx
ld4 r37=[r3],16 // r13 == ebp
cmp.ltu.unc p6,p7=r8,r15
;;
ld4 r34=[r2],8 // r10 == edx
ld4 r36=[r3],8 // r15 == edi
(p6) shladd r16=r8,3,r16 // force ni_syscall if not valid syscall number
;;
ld8 r16=[r16]
;;
ld4 r32=[r2],8 // r11 == ebx
mov b6=r16
ld4 r35=[r3],8 // r14 == esi
br.call.sptk.few rp=b6 // do the syscall
.ia32_strace_check_retval:
cmp.lt p6,p0=r8,r0 // syscall failed?
adds r2=IA64_PT_REGS_R8_OFFSET+16,sp // r2 = &pt_regs.r8
;;
st8.spill [r2]=r8 // store return value in slot for r8
br.call.sptk.few rp=syscall_trace_leave // give parent a chance to catch return value
.ret4: alloc r2=ar.pfs,0,0,0,0 // drop the syscall argument frame
br.cond.sptk.many ia64_leave_kernel
END(ia32_trace_syscall)
GLOBAL_ENTRY(sys32_vfork)
alloc r16=ar.pfs,2,2,4,0;;
mov out0=IA64_CLONE_VFORK|IA64_CLONE_VM|SIGCHLD // out0 = clone_flags
br.cond.sptk.few .fork1 // do the work
END(sys32_vfork)
GLOBAL_ENTRY(sys32_fork)
.prologue ASM_UNW_PRLG_RP|ASM_UNW_PRLG_PFS, ASM_UNW_PRLG_GRSAVE(2)
alloc r16=ar.pfs,2,2,4,0
mov out0=SIGCHLD // out0 = clone_flags
;;
.fork1:
mov loc0=rp
mov loc1=r16 // save ar.pfs across do_fork
DO_SAVE_SWITCH_STACK
.body
mov out1=0
mov out3=0
adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = ®s
br.call.sptk.few rp=do_fork
.ret5: .restore sp
adds sp=IA64_SWITCH_STACK_SIZE,sp // pop the switch stack
mov ar.pfs=loc1
mov rp=loc0
br.ret.sptk.many rp
END(sys32_fork)
.rodata
.align 8
.globl ia32_syscall_table
ia32_syscall_table:
data8 sys_ni_syscall /* 0 - old "setup(" system call*/
data8 sys_exit
data8 sys32_fork
data8 sys_read
data8 sys_write
data8 compat_sys_open /* 5 */
data8 sys_close
data8 sys32_waitpid
data8 sys_creat
data8 sys_link
data8 sys_unlink /* 10 */
data8 ia32_execve
data8 sys_chdir
data8 compat_sys_time
data8 sys_mknod
data8 sys_chmod /* 15 */
data8 sys_lchown /* 16-bit version */
data8 sys_ni_syscall /* old break syscall holder */
data8 sys_ni_syscall
data8 sys32_lseek
data8 sys_getpid /* 20 */
data8 compat_sys_mount
data8 sys_oldumount
data8 sys_setuid /* 16-bit version */
data8 sys_getuid /* 16-bit version */
data8 compat_sys_stime /* 25 */
data8 compat_sys_ptrace
data8 sys32_alarm
data8 sys_ni_syscall
data8 sys_pause
data8 compat_sys_utime /* 30 */
data8 sys_ni_syscall /* old stty syscall holder */
data8 sys_ni_syscall /* old gtty syscall holder */
data8 sys_access
data8 sys_nice
data8 sys_ni_syscall /* 35 */ /* old ftime syscall holder */
data8 sys_sync
data8 sys_kill
data8 sys_rename
data8 sys_mkdir
data8 sys_rmdir /* 40 */
data8 sys_dup
data8 sys_ia64_pipe
data8 compat_sys_times
data8 sys_ni_syscall /* old prof syscall holder */
data8 sys32_brk /* 45 */
data8 sys_setgid /* 16-bit version */
data8 sys_getgid /* 16-bit version */
data8 sys32_signal
data8 sys_geteuid /* 16-bit version */
data8 sys_getegid /* 16-bit version */ /* 50 */
data8 sys_acct
data8 sys_umount /* recycled never used phys( */
data8 sys_ni_syscall /* old lock syscall holder */
data8 compat_sys_ioctl
data8 compat_sys_fcntl /* 55 */
data8 sys_ni_syscall /* old mpx syscall holder */
data8 sys_setpgid
data8 sys_ni_syscall /* old ulimit syscall holder */
data8 sys_ni_syscall
data8 sys_umask /* 60 */
data8 sys_chroot
data8 compat_sys_ustat
data8 sys_dup2
data8 sys_getppid
data8 sys_getpgrp /* 65 */
data8 sys_setsid
data8 sys32_sigaction
data8 sys_ni_syscall
data8 sys_ni_syscall
data8 sys_setreuid /* 16-bit version */ /* 70 */
data8 sys_setregid /* 16-bit version */
data8 sys32_sigsuspend
data8 compat_sys_sigpending
data8 sys_sethostname
data8 compat_sys_setrlimit /* 75 */
data8 compat_sys_old_getrlimit
data8 compat_sys_getrusage
data8 compat_sys_gettimeofday
data8 compat_sys_settimeofday
data8 sys32_getgroups16 /* 80 */
data8 sys32_setgroups16
data8 sys32_old_select
data8 sys_symlink
data8 sys_ni_syscall
data8 sys_readlink /* 85 */
data8 sys_uselib
data8 sys_swapon
data8 sys_reboot
data8 compat_sys_old_readdir
data8 sys32_mmap /* 90 */
data8 sys32_munmap
data8 sys_truncate
data8 sys_ftruncate
data8 sys_fchmod
data8 sys_fchown /* 16-bit version */ /* 95 */
data8 sys_getpriority
data8 sys_setpriority
data8 sys_ni_syscall /* old profil syscall holder */
data8 compat_sys_statfs
data8 compat_sys_fstatfs /* 100 */
data8 sys_ni_syscall /* ioperm */
data8 compat_sys_socketcall
data8 sys_syslog
data8 compat_sys_setitimer
data8 compat_sys_getitimer /* 105 */
data8 compat_sys_newstat
data8 compat_sys_newlstat
data8 compat_sys_newfstat
data8 sys_ni_syscall
data8 sys_ni_syscall /* iopl */ /* 110 */
data8 sys_vhangup
data8 sys_ni_syscall /* used to be sys_idle */
data8 sys_ni_syscall
data8 compat_sys_wait4
data8 sys_swapoff /* 115 */
data8 compat_sys_sysinfo
data8 sys32_ipc
data8 sys_fsync
data8 sys32_sigreturn
data8 ia32_clone /* 120 */
data8 sys_setdomainname
data8 sys32_newuname
data8 sys32_modify_ldt
data8 compat_sys_adjtimex
data8 sys32_mprotect /* 125 */
data8 compat_sys_sigprocmask
data8 sys_ni_syscall /* create_module */
data8 sys_ni_syscall /* init_module */
data8 sys_ni_syscall /* delete_module */
data8 sys_ni_syscall /* get_kernel_syms */ /* 130 */
data8 sys32_quotactl
data8 sys_getpgid
data8 sys_fchdir
data8 sys_ni_syscall /* sys_bdflush */
data8 sys_sysfs /* 135 */
data8 sys32_personality
data8 sys_ni_syscall /* for afs_syscall */
data8 sys_setfsuid /* 16-bit version */
data8 sys_setfsgid /* 16-bit version */
data8 sys_llseek /* 140 */
data8 compat_sys_getdents
data8 compat_sys_select
data8 sys_flock
data8 sys32_msync
data8 compat_sys_readv /* 145 */
data8 compat_sys_writev
data8 sys_getsid
data8 sys_fdatasync
data8 compat_sys_sysctl
data8 sys_mlock /* 150 */
data8 sys_munlock
data8 sys_mlockall
data8 sys_munlockall
data8 sys_sched_setparam
data8 sys_sched_getparam /* 155 */
data8 sys_sched_setscheduler
data8 sys_sched_getscheduler
data8 sys_sched_yield
data8 sys_sched_get_priority_max
data8 sys_sched_get_priority_min /* 160 */
data8 sys32_sched_rr_get_interval
data8 compat_sys_nanosleep
data8 sys32_mremap
data8 sys_setresuid /* 16-bit version */
data8 sys32_getresuid16 /* 16-bit version */ /* 165 */
data8 sys_ni_syscall /* vm86 */
data8 sys_ni_syscall /* sys_query_module */
data8 sys_poll
data8 sys_ni_syscall /* nfsservctl */
data8 sys_setresgid /* 170 */
data8 sys32_getresgid16
data8 sys_prctl
data8 sys32_rt_sigreturn
data8 sys32_rt_sigaction
data8 sys32_rt_sigprocmask /* 175 */
data8 sys_rt_sigpending
data8 compat_sys_rt_sigtimedwait
data8 sys32_rt_sigqueueinfo
data8 compat_sys_rt_sigsuspend
data8 sys32_pread /* 180 */
data8 sys32_pwrite
data8 sys_chown /* 16-bit version */
data8 sys_getcwd
data8 sys_capget
data8 sys_capset /* 185 */
data8 sys32_sigaltstack
data8 sys32_sendfile
data8 sys_ni_syscall /* streams1 */
data8 sys_ni_syscall /* streams2 */
data8 sys32_vfork /* 190 */
data8 compat_sys_getrlimit
data8 sys32_mmap2
data8 sys32_truncate64
data8 sys32_ftruncate64
data8 sys32_stat64 /* 195 */
data8 sys32_lstat64
data8 sys32_fstat64
data8 sys_lchown
data8 sys_getuid
data8 sys_getgid /* 200 */
data8 sys_geteuid
data8 sys_getegid
data8 sys_setreuid
data8 sys_setregid
data8 sys_getgroups /* 205 */
data8 sys_setgroups
data8 sys_fchown
data8 sys_setresuid
data8 sys_getresuid
data8 sys_setresgid /* 210 */
data8 sys_getresgid
data8 sys_chown
data8 sys_setuid
data8 sys_setgid
data8 sys_setfsuid /* 215 */
data8 sys_setfsgid
data8 sys_pivot_root
data8 sys_mincore
data8 sys_madvise
data8 compat_sys_getdents64 /* 220 */
data8 compat_sys_fcntl64
data8 sys_ni_syscall /* reserved for TUX */
data8 sys_ni_syscall /* reserved for Security */
data8 sys_gettid
data8 sys_readahead /* 225 */
data8 sys_setxattr
data8 sys_lsetxattr
data8 sys_fsetxattr
data8 sys_getxattr
data8 sys_lgetxattr /* 230 */
data8 sys_fgetxattr
data8 sys_listxattr
data8 sys_llistxattr
data8 sys_flistxattr
data8 sys_removexattr /* 235 */
data8 sys_lremovexattr
data8 sys_fremovexattr
data8 sys_tkill
data8 sys_sendfile64
data8 compat_sys_futex /* 240 */
data8 compat_sys_sched_setaffinity
data8 compat_sys_sched_getaffinity
data8 sys32_set_thread_area
data8 sys32_get_thread_area
data8 compat_sys_io_setup /* 245 */
data8 sys_io_destroy
data8 compat_sys_io_getevents
data8 compat_sys_io_submit
data8 sys_io_cancel
data8 sys_fadvise64 /* 250 */
data8 sys_ni_syscall
data8 sys_exit_group
data8 sys_lookup_dcookie
data8 sys_epoll_create
data8 sys32_epoll_ctl /* 255 */
data8 sys32_epoll_wait
data8 sys_remap_file_pages
data8 sys_set_tid_address
data8 compat_sys_timer_create
data8 compat_sys_timer_settime /* 260 */
data8 compat_sys_timer_gettime
data8 sys_timer_getoverrun
data8 sys_timer_delete
data8 compat_sys_clock_settime
data8 compat_sys_clock_gettime /* 265 */
data8 compat_sys_clock_getres
data8 compat_sys_clock_nanosleep
data8 compat_sys_statfs64
data8 compat_sys_fstatfs64
data8 sys_tgkill /* 270 */
data8 compat_sys_utimes
data8 sys32_fadvise64_64
data8 sys_ni_syscall
data8 sys_ni_syscall
data8 sys_ni_syscall /* 275 */
data8 sys_ni_syscall
data8 compat_sys_mq_open
data8 sys_mq_unlink
data8 compat_sys_mq_timedsend
data8 compat_sys_mq_timedreceive /* 280 */
data8 compat_sys_mq_notify
data8 compat_sys_mq_getsetattr
data8 sys_ni_syscall /* reserved for kexec */
data8 compat_sys_waitid
// guard against failures to increase IA32_NR_syscalls
.org ia32_syscall_table + 8*IA32_NR_syscalls