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ia32entry.S
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/*
* Compatibility mode system call entry point for x86-64.
*
* Copyright 2000-2002 Andi Kleen, SuSE Labs.
*/
#include <asm/dwarf2.h>
#include <asm/calling.h>
#include <asm/asm-offsets.h>
#include <asm/current.h>
#include <asm/errno.h>
#include <asm/ia32_unistd.h>
#include <asm/thread_info.h>
#include <asm/segment.h>
#include <asm/vsyscall32.h>
#include <linux/linkage.h>
.macro IA32_ARG_FIXUP noebp=0
movl %edi,%r8d
.if \noebp
.else
movl %ebp,%r9d
.endif
xchg %ecx,%esi
movl %ebx,%edi
movl %edx,%edx /* zero extension */
.endm
/* clobbers %eax */
.macro CLEAR_RREGS
xorl %eax,%eax
movq %rax,R11(%rsp)
movq %rax,R10(%rsp)
movq %rax,R9(%rsp)
movq %rax,R8(%rsp)
.endm
/*
* 32bit SYSENTER instruction entry.
*
* Arguments:
* %eax System call number.
* %ebx Arg1
* %ecx Arg2
* %edx Arg3
* %esi Arg4
* %edi Arg5
* %ebp user stack
* 0(%ebp) Arg6
*
* Interrupts off.
*
* This is purely a fast path. For anything complicated we use the int 0x80
* path below. Set up a complete hardware stack frame to share code
* with the int 0x80 path.
*/
ENTRY(ia32_sysenter_target)
CFI_STARTPROC simple
CFI_DEF_CFA rsp,0
CFI_REGISTER rsp,rbp
swapgs
movq %gs:pda_kernelstack, %rsp
addq $(PDA_STACKOFFSET),%rsp
sti
movl %ebp,%ebp /* zero extension */
pushq $__USER32_DS
CFI_ADJUST_CFA_OFFSET 8
/*CFI_REL_OFFSET ss,0*/
pushq %rbp
CFI_ADJUST_CFA_OFFSET 8
CFI_REL_OFFSET rsp,0
pushfq
CFI_ADJUST_CFA_OFFSET 8
/*CFI_REL_OFFSET rflags,0*/
movl $VSYSCALL32_SYSEXIT, %r10d
CFI_REGISTER rip,r10
pushq $__USER32_CS
CFI_ADJUST_CFA_OFFSET 8
/*CFI_REL_OFFSET cs,0*/
movl %eax, %eax
pushq %r10
CFI_ADJUST_CFA_OFFSET 8
CFI_REL_OFFSET rip,0
pushq %rax
CFI_ADJUST_CFA_OFFSET 8
cld
SAVE_ARGS 0,0,1
/* no need to do an access_ok check here because rbp has been
32bit zero extended */
1: movl (%rbp),%r9d
.section __ex_table,"a"
.quad 1b,ia32_badarg
.previous
GET_THREAD_INFO(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
CFI_REMEMBER_STATE
jnz sysenter_tracesys
sysenter_do_call:
cmpl $(IA32_NR_syscalls),%eax
jae ia32_badsys
IA32_ARG_FIXUP 1
call *ia32_sys_call_table(,%rax,8)
movq %rax,RAX-ARGOFFSET(%rsp)
GET_THREAD_INFO(%r10)
cli
testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
jnz int_ret_from_sys_call
/* clear IF, that popfq doesn't enable interrupts early */
andl $~0x200,EFLAGS-R11(%rsp)
RESTORE_ARGS 1,24,1,1,1,1
popfq
CFI_ADJUST_CFA_OFFSET -8
/*CFI_RESTORE rflags*/
popq %rcx /* User %esp */
CFI_ADJUST_CFA_OFFSET -8
CFI_REGISTER rsp,rcx
movl $VSYSCALL32_SYSEXIT,%edx /* User %eip */
CFI_REGISTER rip,rdx
swapgs
sti /* sti only takes effect after the next instruction */
/* sysexit */
.byte 0xf, 0x35
sysenter_tracesys:
CFI_RESTORE_STATE
SAVE_REST
CLEAR_RREGS
movq $-ENOSYS,RAX(%rsp) /* really needed? */
movq %rsp,%rdi /* &pt_regs -> arg1 */
call syscall_trace_enter
LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */
RESTORE_REST
movl %ebp, %ebp
/* no need to do an access_ok check here because rbp has been
32bit zero extended */
1: movl (%rbp),%r9d
.section __ex_table,"a"
.quad 1b,ia32_badarg
.previous
jmp sysenter_do_call
CFI_ENDPROC
/*
* 32bit SYSCALL instruction entry.
*
* Arguments:
* %eax System call number.
* %ebx Arg1
* %ecx return EIP
* %edx Arg3
* %esi Arg4
* %edi Arg5
* %ebp Arg2 [note: not saved in the stack frame, should not be touched]
* %esp user stack
* 0(%esp) Arg6
*
* Interrupts off.
*
* This is purely a fast path. For anything complicated we use the int 0x80
* path below. Set up a complete hardware stack frame to share code
* with the int 0x80 path.
*/
ENTRY(ia32_cstar_target)
CFI_STARTPROC simple
CFI_DEF_CFA rsp,0
CFI_REGISTER rip,rcx
/*CFI_REGISTER rflags,r11*/
swapgs
movl %esp,%r8d
CFI_REGISTER rsp,r8
movq %gs:pda_kernelstack,%rsp
sti
SAVE_ARGS 8,1,1
movl %eax,%eax /* zero extension */
movq %rax,ORIG_RAX-ARGOFFSET(%rsp)
movq %rcx,RIP-ARGOFFSET(%rsp)
CFI_REL_OFFSET rip,RIP-ARGOFFSET
movq %rbp,RCX-ARGOFFSET(%rsp) /* this lies slightly to ptrace */
movl %ebp,%ecx
movq $__USER32_CS,CS-ARGOFFSET(%rsp)
movq $__USER32_DS,SS-ARGOFFSET(%rsp)
movq %r11,EFLAGS-ARGOFFSET(%rsp)
/*CFI_REL_OFFSET rflags,EFLAGS-ARGOFFSET*/
movq %r8,RSP-ARGOFFSET(%rsp)
CFI_REL_OFFSET rsp,RSP-ARGOFFSET
/* no need to do an access_ok check here because r8 has been
32bit zero extended */
/* hardware stack frame is complete now */
1: movl (%r8),%r9d
.section __ex_table,"a"
.quad 1b,ia32_badarg
.previous
GET_THREAD_INFO(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
CFI_REMEMBER_STATE
jnz cstar_tracesys
cstar_do_call:
cmpl $IA32_NR_syscalls,%eax
jae ia32_badsys
IA32_ARG_FIXUP 1
call *ia32_sys_call_table(,%rax,8)
movq %rax,RAX-ARGOFFSET(%rsp)
GET_THREAD_INFO(%r10)
cli
testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
jnz int_ret_from_sys_call
RESTORE_ARGS 1,-ARG_SKIP,1,1,1
movl RIP-ARGOFFSET(%rsp),%ecx
CFI_REGISTER rip,rcx
movl EFLAGS-ARGOFFSET(%rsp),%r11d
/*CFI_REGISTER rflags,r11*/
movl RSP-ARGOFFSET(%rsp),%esp
CFI_RESTORE rsp
swapgs
sysretl
cstar_tracesys:
CFI_RESTORE_STATE
SAVE_REST
CLEAR_RREGS
movq $-ENOSYS,RAX(%rsp) /* really needed? */
movq %rsp,%rdi /* &pt_regs -> arg1 */
call syscall_trace_enter
LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */
RESTORE_REST
movl RSP-ARGOFFSET(%rsp), %r8d
/* no need to do an access_ok check here because r8 has been
32bit zero extended */
1: movl (%r8),%r9d
.section __ex_table,"a"
.quad 1b,ia32_badarg
.previous
jmp cstar_do_call
ia32_badarg:
movq $-EFAULT,%rax
jmp ia32_sysret
CFI_ENDPROC
/*
* Emulated IA32 system calls via int 0x80.
*
* Arguments:
* %eax System call number.
* %ebx Arg1
* %ecx Arg2
* %edx Arg3
* %esi Arg4
* %edi Arg5
* %ebp Arg6 [note: not saved in the stack frame, should not be touched]
*
* Notes:
* Uses the same stack frame as the x86-64 version.
* All registers except %eax must be saved (but ptrace may violate that)
* Arguments are zero extended. For system calls that want sign extension and
* take long arguments a wrapper is needed. Most calls can just be called
* directly.
* Assumes it is only called from user space and entered with interrupts off.
*/
ENTRY(ia32_syscall)
CFI_STARTPROC simple
CFI_DEF_CFA rsp,SS+8-RIP
/*CFI_REL_OFFSET ss,SS-RIP*/
CFI_REL_OFFSET rsp,RSP-RIP
/*CFI_REL_OFFSET rflags,EFLAGS-RIP*/
/*CFI_REL_OFFSET cs,CS-RIP*/
CFI_REL_OFFSET rip,RIP-RIP
swapgs
sti
movl %eax,%eax
pushq %rax
CFI_ADJUST_CFA_OFFSET 8
cld
/* note the registers are not zero extended to the sf.
this could be a problem. */
SAVE_ARGS 0,0,1
GET_THREAD_INFO(%r10)
testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
jnz ia32_tracesys
ia32_do_syscall:
cmpl $(IA32_NR_syscalls),%eax
jae ia32_badsys
IA32_ARG_FIXUP
call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
ia32_sysret:
movq %rax,RAX-ARGOFFSET(%rsp)
jmp int_ret_from_sys_call
ia32_tracesys:
SAVE_REST
movq $-ENOSYS,RAX(%rsp) /* really needed? */
movq %rsp,%rdi /* &pt_regs -> arg1 */
call syscall_trace_enter
LOAD_ARGS ARGOFFSET /* reload args from stack in case ptrace changed it */
RESTORE_REST
jmp ia32_do_syscall
ia32_badsys:
movq $0,ORIG_RAX-ARGOFFSET(%rsp)
movq $-ENOSYS,RAX-ARGOFFSET(%rsp)
jmp int_ret_from_sys_call
ni_syscall:
movq %rax,%rdi
jmp sys32_ni_syscall
quiet_ni_syscall:
movq $-ENOSYS,%rax
ret
CFI_ENDPROC
.macro PTREGSCALL label, func, arg
.globl \label
\label:
leaq \func(%rip),%rax
leaq -ARGOFFSET+8(%rsp),\arg /* 8 for return address */
jmp ia32_ptregs_common
.endm
CFI_STARTPROC
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
PTREGSCALL stub32_sigsuspend, sys32_sigsuspend, %rcx
PTREGSCALL stub32_execve, sys32_execve, %rcx
PTREGSCALL stub32_fork, sys_fork, %rdi
PTREGSCALL stub32_clone, sys32_clone, %rdx
PTREGSCALL stub32_vfork, sys_vfork, %rdi
PTREGSCALL stub32_iopl, sys_iopl, %rsi
PTREGSCALL stub32_rt_sigsuspend, sys_rt_sigsuspend, %rdx
ENTRY(ia32_ptregs_common)
popq %r11
CFI_ADJUST_CFA_OFFSET -8
CFI_REGISTER rip, r11
SAVE_REST
call *%rax
RESTORE_REST
jmp ia32_sysret /* misbalances the return cache */
CFI_ENDPROC
.data
.align 8
.globl ia32_sys_call_table
ia32_sys_call_table:
.quad sys_restart_syscall
.quad sys_exit
.quad stub32_fork
.quad sys_read
.quad sys_write
.quad compat_sys_open /* 5 */
.quad sys_close
.quad sys32_waitpid
.quad sys_creat
.quad sys_link
.quad sys_unlink /* 10 */
.quad stub32_execve
.quad sys_chdir
.quad compat_sys_time
.quad sys_mknod
.quad sys_chmod /* 15 */
.quad sys_lchown16
.quad quiet_ni_syscall /* old break syscall holder */
.quad sys_stat
.quad sys32_lseek
.quad sys_getpid /* 20 */
.quad compat_sys_mount /* mount */
.quad sys_oldumount /* old_umount */
.quad sys_setuid16
.quad sys_getuid16
.quad compat_sys_stime /* stime */ /* 25 */
.quad sys32_ptrace /* ptrace */
.quad sys_alarm
.quad sys_fstat /* (old)fstat */
.quad sys_pause
.quad compat_sys_utime /* 30 */
.quad quiet_ni_syscall /* old stty syscall holder */
.quad quiet_ni_syscall /* old gtty syscall holder */
.quad sys_access
.quad sys_nice
.quad quiet_ni_syscall /* 35 */ /* old ftime syscall holder */
.quad sys_sync
.quad sys32_kill
.quad sys_rename
.quad sys_mkdir
.quad sys_rmdir /* 40 */
.quad sys_dup
.quad sys32_pipe
.quad compat_sys_times
.quad quiet_ni_syscall /* old prof syscall holder */
.quad sys_brk /* 45 */
.quad sys_setgid16
.quad sys_getgid16
.quad sys_signal
.quad sys_geteuid16
.quad sys_getegid16 /* 50 */
.quad sys_acct
.quad sys_umount /* new_umount */
.quad quiet_ni_syscall /* old lock syscall holder */
.quad compat_sys_ioctl
.quad compat_sys_fcntl64 /* 55 */
.quad quiet_ni_syscall /* old mpx syscall holder */
.quad sys_setpgid
.quad quiet_ni_syscall /* old ulimit syscall holder */
.quad sys32_olduname
.quad sys_umask /* 60 */
.quad sys_chroot
.quad sys32_ustat
.quad sys_dup2
.quad sys_getppid
.quad sys_getpgrp /* 65 */
.quad sys_setsid
.quad sys32_sigaction
.quad sys_sgetmask
.quad sys_ssetmask
.quad sys_setreuid16 /* 70 */
.quad sys_setregid16
.quad stub32_sigsuspend
.quad compat_sys_sigpending
.quad sys_sethostname
.quad compat_sys_setrlimit /* 75 */
.quad compat_sys_old_getrlimit /* old_getrlimit */
.quad compat_sys_getrusage
.quad sys32_gettimeofday
.quad sys32_settimeofday
.quad sys_getgroups16 /* 80 */
.quad sys_setgroups16
.quad sys32_old_select
.quad sys_symlink
.quad sys_lstat
.quad sys_readlink /* 85 */
#ifdef CONFIG_IA32_AOUT
.quad sys_uselib
#else
.quad quiet_ni_syscall
#endif
.quad sys_swapon
.quad sys_reboot
.quad compat_sys_old_readdir
.quad sys32_mmap /* 90 */
.quad sys_munmap
.quad sys_truncate
.quad sys_ftruncate
.quad sys_fchmod
.quad sys_fchown16 /* 95 */
.quad sys_getpriority
.quad sys_setpriority
.quad quiet_ni_syscall /* old profil syscall holder */
.quad compat_sys_statfs
.quad compat_sys_fstatfs /* 100 */
.quad sys_ioperm
.quad compat_sys_socketcall
.quad sys_syslog
.quad compat_sys_setitimer
.quad compat_sys_getitimer /* 105 */
.quad compat_sys_newstat
.quad compat_sys_newlstat
.quad compat_sys_newfstat
.quad sys32_uname
.quad stub32_iopl /* 110 */
.quad sys_vhangup
.quad quiet_ni_syscall /* old "idle" system call */
.quad sys32_vm86_warning /* vm86old */
.quad compat_sys_wait4
.quad sys_swapoff /* 115 */
.quad sys32_sysinfo
.quad sys32_ipc
.quad sys_fsync
.quad stub32_sigreturn
.quad stub32_clone /* 120 */
.quad sys_setdomainname
.quad sys_uname
.quad sys_modify_ldt
.quad sys32_adjtimex
.quad sys32_mprotect /* 125 */
.quad compat_sys_sigprocmask
.quad quiet_ni_syscall /* create_module */
.quad sys_init_module
.quad sys_delete_module
.quad quiet_ni_syscall /* 130 get_kernel_syms */
.quad sys_quotactl
.quad sys_getpgid
.quad sys_fchdir
.quad quiet_ni_syscall /* bdflush */
.quad sys_sysfs /* 135 */
.quad sys_personality
.quad quiet_ni_syscall /* for afs_syscall */
.quad sys_setfsuid16
.quad sys_setfsgid16
.quad sys_llseek /* 140 */
.quad compat_sys_getdents
.quad compat_sys_select
.quad sys_flock
.quad sys_msync
.quad compat_sys_readv /* 145 */
.quad compat_sys_writev
.quad sys_getsid
.quad sys_fdatasync
.quad sys32_sysctl /* sysctl */
.quad sys_mlock /* 150 */
.quad sys_munlock
.quad sys_mlockall
.quad sys_munlockall
.quad sys_sched_setparam
.quad sys_sched_getparam /* 155 */
.quad sys_sched_setscheduler
.quad sys_sched_getscheduler
.quad sys_sched_yield
.quad sys_sched_get_priority_max
.quad sys_sched_get_priority_min /* 160 */
.quad sys_sched_rr_get_interval
.quad compat_sys_nanosleep
.quad sys_mremap
.quad sys_setresuid16
.quad sys_getresuid16 /* 165 */
.quad sys32_vm86_warning /* vm86 */
.quad quiet_ni_syscall /* query_module */
.quad sys_poll
.quad compat_sys_nfsservctl
.quad sys_setresgid16 /* 170 */
.quad sys_getresgid16
.quad sys_prctl
.quad stub32_rt_sigreturn
.quad sys32_rt_sigaction
.quad sys32_rt_sigprocmask /* 175 */
.quad sys32_rt_sigpending
.quad compat_sys_rt_sigtimedwait
.quad sys32_rt_sigqueueinfo
.quad stub32_rt_sigsuspend
.quad sys32_pread /* 180 */
.quad sys32_pwrite
.quad sys_chown16
.quad sys_getcwd
.quad sys_capget
.quad sys_capset
.quad stub32_sigaltstack
.quad sys32_sendfile
.quad quiet_ni_syscall /* streams1 */
.quad quiet_ni_syscall /* streams2 */
.quad stub32_vfork /* 190 */
.quad compat_sys_getrlimit
.quad sys32_mmap2
.quad sys32_truncate64
.quad sys32_ftruncate64
.quad sys32_stat64 /* 195 */
.quad sys32_lstat64
.quad sys32_fstat64
.quad sys_lchown
.quad sys_getuid
.quad sys_getgid /* 200 */
.quad sys_geteuid
.quad sys_getegid
.quad sys_setreuid
.quad sys_setregid
.quad sys_getgroups /* 205 */
.quad sys_setgroups
.quad sys_fchown
.quad sys_setresuid
.quad sys_getresuid
.quad sys_setresgid /* 210 */
.quad sys_getresgid
.quad sys_chown
.quad sys_setuid
.quad sys_setgid
.quad sys_setfsuid /* 215 */
.quad sys_setfsgid
.quad sys_pivot_root
.quad sys_mincore
.quad sys_madvise
.quad compat_sys_getdents64 /* 220 getdents64 */
.quad compat_sys_fcntl64
.quad quiet_ni_syscall /* tux */
.quad quiet_ni_syscall /* security */
.quad sys_gettid
.quad sys_readahead /* 225 */
.quad sys_setxattr
.quad sys_lsetxattr
.quad sys_fsetxattr
.quad sys_getxattr
.quad sys_lgetxattr /* 230 */
.quad sys_fgetxattr
.quad sys_listxattr
.quad sys_llistxattr
.quad sys_flistxattr
.quad sys_removexattr /* 235 */
.quad sys_lremovexattr
.quad sys_fremovexattr
.quad sys_tkill
.quad sys_sendfile64
.quad compat_sys_futex /* 240 */
.quad compat_sys_sched_setaffinity
.quad compat_sys_sched_getaffinity
.quad sys32_set_thread_area
.quad sys32_get_thread_area
.quad compat_sys_io_setup /* 245 */
.quad sys_io_destroy
.quad compat_sys_io_getevents
.quad compat_sys_io_submit
.quad sys_io_cancel
.quad sys_fadvise64 /* 250 */
.quad quiet_ni_syscall /* free_huge_pages */
.quad sys_exit_group
.quad sys32_lookup_dcookie
.quad sys_epoll_create
.quad sys_epoll_ctl /* 255 */
.quad sys_epoll_wait
.quad sys_remap_file_pages
.quad sys_set_tid_address
.quad sys32_timer_create
.quad compat_sys_timer_settime /* 260 */
.quad compat_sys_timer_gettime
.quad sys_timer_getoverrun
.quad sys_timer_delete
.quad compat_sys_clock_settime
.quad compat_sys_clock_gettime /* 265 */
.quad compat_sys_clock_getres
.quad compat_sys_clock_nanosleep
.quad compat_sys_statfs64
.quad compat_sys_fstatfs64
.quad sys_tgkill /* 270 */
.quad compat_sys_utimes
.quad sys32_fadvise64_64
.quad quiet_ni_syscall /* sys_vserver */
.quad sys_mbind
.quad compat_sys_get_mempolicy /* 275 */
.quad sys_set_mempolicy
.quad compat_sys_mq_open
.quad sys_mq_unlink
.quad compat_sys_mq_timedsend
.quad compat_sys_mq_timedreceive /* 280 */
.quad compat_sys_mq_notify
.quad compat_sys_mq_getsetattr
.quad compat_sys_kexec_load /* reserved for kexec */
.quad compat_sys_waitid
.quad quiet_ni_syscall /* 285: sys_altroot */
.quad sys_add_key
.quad sys_request_key
.quad sys_keyctl
.quad sys_ioprio_set
.quad sys_ioprio_get /* 290 */
.quad sys_inotify_init
.quad sys_inotify_add_watch
.quad sys_inotify_rm_watch
ia32_syscall_end:
.rept IA32_NR_syscalls-(ia32_syscall_end-ia32_sys_call_table)/8
.quad ni_syscall
.endr