/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle
* Copyright (C) 2001 MIPS Technologies, Inc.
*/
#include <linux/config.h>
#include <linux/errno.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/isadep.h>
#include <asm/sysmips.h>
#include <asm/thread_info.h>
#include <asm/unistd.h>
#include <asm/offset.h>
/* Highest syscall used of any syscall flavour */
#define MAX_SYSCALL_NO __NR_O32_Linux + __NR_O32_Linux_syscalls
.align 5
NESTED(handle_sys, PT_SIZE, sp)
.set noat
SAVE_SOME
STI
.set at
lw t1, PT_EPC(sp) # skip syscall on return
sltiu t0, v0, MAX_SYSCALL_NO + 1 # check syscall number
addiu t1, 4 # skip to next instruction
sw t1, PT_EPC(sp)
beqz t0, illegal_syscall
/* XXX Put both in one cacheline, should save a bit. */
sll t0, v0, 2
lw t2, sys_call_table(t0) # syscall routine
lbu t3, sys_narg_table(v0) # number of arguments
beqz t2, illegal_syscall;
subu t0, t3, 5 # 5 or more arguments?
sw a3, PT_R26(sp) # save a3 for syscall restarting
bgez t0, stackargs
stack_done:
sw a3, PT_R26(sp) # save for syscall restart
LONG_L t0, TI_FLAGS($28) # syscall tracing enabled?
li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
and t0, t1, t0
bnez t0, syscall_trace_entry # -> yes
jalr t2 # Do The Real Thing (TM)
li t0, -EMAXERRNO - 1 # error?
sltu t0, t0, v0
sw t0, PT_R7(sp) # set error flag
beqz t0, 1f
negu v0 # error
sw v0, PT_R0(sp) # set flag for syscall
# restarting
1: sw v0, PT_R2(sp) # result
EXPORT(o32_syscall_exit)
local_irq_disable # make sure need_resched and
# signals dont change between
# sampling and return
LONG_L a2, TI_FLAGS($28) # current->work
li t0, _TIF_ALLWORK_MASK
and t0, a2, t0
bnez t0, o32_syscall_exit_work
j restore_partial
o32_syscall_exit_work:
j syscall_exit_work_partial
/* ------------------------------------------------------------------------ */
syscall_trace_entry:
SAVE_STATIC
sw t2, PT_R1(sp)
move a0, sp
li a1, 0
jal do_syscall_trace
lw t2, PT_R1(sp)
lw a0, PT_R4(sp) # Restore argument registers
lw a1, PT_R5(sp)
lw a2, PT_R6(sp)
lw a3, PT_R7(sp)
jalr t2
li t0, -EMAXERRNO - 1 # error?
sltu t0, t0, v0
sw t0, PT_R7(sp) # set error flag
beqz t0, 1f
negu v0 # error
sw v0, PT_R0(sp) # set flag for syscall
# restarting
1: sw v0, PT_R2(sp) # result
j syscall_exit
/* ------------------------------------------------------------------------ */
/*
* More than four arguments. Try to deal with it by copying the
* stack arguments from the user stack to the kernel stack.
* This Sucks (TM).
*/
stackargs:
lw t0, PT_R29(sp) # get old user stack pointer
subu t3, 4
sll t1, t3, 2 # stack valid?
addu t1, t0 # end address
or t0, t1
bltz t0, bad_stack # -> sp is bad
lw t0, PT_R29(sp) # get old user stack pointer
PTR_LA t1, 4f # copy 1 to 3 arguments
sll t3, t3, 4
subu t1, t3
jr t1
/* Ok, copy the args from the luser stack to the kernel stack */
/*
* I know Ralf doesn't like nops but this avoids code
* duplication for R3000 targets (and this is the
* only place where ".set reorder" doesn't help).
* Harald.
*/
.set push
.set noreorder
.set nomacro
1: lw t1, 24(t0) # argument #7 from usp
nop
sw t1, 24(sp)
nop
2: lw t1, 20(t0) # argument #5 from usp
nop
sw t1, 20(sp)
nop
3: lw t1, 16(t0) # argument #5 from usp
nop
sw t1, 16(sp)
nop
4: .set pop
j stack_done # go back
.section __ex_table,"a"
PTR 1b,bad_stack
PTR 2b,bad_stack
PTR 3b,bad_stack
.previous
/*
* The stackpointer for a call with more than 4 arguments is bad.
* We probably should handle this case a bit more drastic.
*/
bad_stack:
negu v0 # error
sw v0, PT_R0(sp)
sw v0, PT_R2(sp)
li t0, 1 # set error flag
sw t0, PT_R7(sp)
j o32_syscall_exit
/*
* The system call does not exist in this kernel
*/
illegal_syscall:
li v0, ENOSYS # error
sw v0, PT_R2(sp)
li t0, 1 # set error flag
sw t0, PT_R7(sp)
j o32_syscall_exit
END(handle_sys)
LEAF(mips_atomic_set)
andi v0, a1, 3 # must be word aligned
bnez v0, bad_alignment
lw v1, TI_ADDR_LIMIT($28) # in legal address range?
addiu a0, a1, 4
or a0, a0, a1
and a0, a0, v1
bltz a0, bad_address
#ifdef CONFIG_CPU_HAS_LLSC
/* Ok, this is the ll/sc case. World is sane :-) */
1: ll v0, (a1)
move a0, a2
2: sc a0, (a1)
beqz a0, 1b
.section __ex_table,"a"
PTR 1b, bad_stack
PTR 2b, bad_stack
.previous
#else
sw a1, 16(sp)
sw a2, 20(sp)
move a0, sp
move a2, a1
li a1, 1
jal do_page_fault
lw a1, 16(sp)
lw a2, 20(sp)
/*
* At this point the page should be readable and writable unless
* there was no more memory available.
*/
1: lw v0, (a1)
2: sw a2, (a1)
.section __ex_table,"a"
PTR 1b, no_mem
PTR 2b, no_mem
.previous
#endif
sw zero, PT_R7(sp) # success
sw v0, PT_R2(sp) # result
/* Success, so skip usual error handling garbage. */
LONG_L a2, TI_FLAGS($28) # syscall tracing enabled?
li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
and t0, a2, t0
bnez t0, 1f
b o32_syscall_exit
1: SAVE_STATIC
move a0, sp
li a1, 1
jal do_syscall_trace
j syscall_exit
no_mem: li v0, -ENOMEM
jr ra
bad_address:
li v0, -EFAULT
jr ra
bad_alignment:
li v0, -EINVAL
jr ra
END(mips_atomic_set)
LEAF(sys_sysmips)
beq a0, MIPS_ATOMIC_SET, mips_atomic_set
j _sys_sysmips
END(sys_sysmips)
LEAF(sys_syscall)
lw t0, PT_R29(sp) # user sp
sltu v0, a0, __NR_O32_Linux + __NR_O32_Linux_syscalls + 1
beqz v0, enosys
sll v0, a0, 2
la v1, sys_syscall
lw t2, sys_call_table(v0) # function pointer
lbu t4, sys_narg_table(a0) # number of arguments
li v0, -EINVAL
beq t2, v1, out # do not recurse
beqz t2, enosys # null function pointer?
andi v0, t0, 0x3 # unaligned stack pointer?
bnez v0, sigsegv
addu v0, t0, 16 # v0 = usp + 16
addu t1, v0, 12 # 3 32-bit arguments
lw v1, TI_ADDR_LIMIT($28)
or v0, v0, t1
and v1, v1, v0
bltz v1, efault
move a0, a1 # shift argument registers
move a1, a2
move a2, a3
1: lw a3, 16(t0)
2: lw t3, 20(t0)
3: lw t4, 24(t0)
.section __ex_table, "a"
.word 1b, efault
.word 2b, efault
.word 3b, efault
.previous
sw t3, 16(sp) # put into new stackframe
sw t4, 20(sp)
bnez t4, 1f # zero arguments?
addu a0, sp, 32 # then pass sp in a0
1:
sw t3, 16(sp)
sw v1, 20(sp)
jr t2
/* Unreached */
enosys: li v0, -ENOSYS
b out
sigsegv:
li a0, _SIGSEGV
move a1, $28
jal force_sig
/* Fall through */
efault: li v0, -EFAULT
out: jr ra
END(sys_syscall)
.macro fifty ptr, nargs, from=1, to=50
sys \ptr \nargs
.if \to-\from
fifty \ptr,\nargs,"(\from+1)",\to
.endif
.endm
.macro mille ptr, nargs, from=1, to=20
fifty \ptr,\nargs
.if \to-\from
mille \ptr,\nargs,"(\from+1)",\to
.endif
.endm
.macro syscalltable
mille sys_ni_syscall 0 /* 0 - 999 SVR4 flavour */
#include "irix5sys.h" /* 1000 - 1999 32-bit IRIX */
mille sys_ni_syscall 0 /* 2000 - 2999 BSD43 flavour */
mille sys_ni_syscall 0 /* 3000 - 3999 POSIX flavour */
sys sys_syscall 0 /* 4000 */
sys sys_exit 1
sys sys_fork 0
sys sys_read 3
sys sys_write 3
sys sys_open 3 /* 4005 */
sys sys_close 1
sys sys_waitpid 3
sys sys_creat 2
sys sys_link 2
sys sys_unlink 1 /* 4010 */
sys sys_execve 0
sys sys_chdir 1
sys sys_time 1
sys sys_mknod 3
sys sys_chmod 2 /* 4015 */
sys sys_lchown 3
sys sys_ni_syscall 0
sys sys_ni_syscall 0 /* was sys_stat */
sys sys_lseek 3
sys sys_getpid 0 /* 4020 */
sys sys_mount 5
sys sys_oldumount 1
sys sys_setuid 1
sys sys_getuid 0
sys sys_stime 1 /* 4025 */
sys sys_ptrace 4
sys sys_alarm 1
sys sys_ni_syscall 0 /* was sys_fstat */
sys sys_pause 0
sys sys_utime 2 /* 4030 */
sys sys_ni_syscall 0
sys sys_ni_syscall 0
sys sys_access 2
sys sys_nice 1
sys sys_ni_syscall 0 /* 4035 */
sys sys_sync 0
sys sys_kill 2
sys sys_rename 2
sys sys_mkdir 2
sys sys_rmdir 1 /* 4040 */
sys sys_dup 1
sys sys_pipe 0
sys sys_times 1
sys sys_ni_syscall 0
sys sys_brk 1 /* 4045 */
sys sys_setgid 1
sys sys_getgid 0
sys sys_ni_syscall 0 /* was signal(2) */
sys sys_geteuid 0
sys sys_getegid 0 /* 4050 */
sys sys_acct 0
sys sys_umount 2
sys sys_ni_syscall 0
sys sys_ioctl 3
sys sys_fcntl 3 /* 4055 */
sys sys_ni_syscall 2
sys sys_setpgid 2
sys sys_ni_syscall 0
sys sys_olduname 1
sys sys_umask 1 /* 4060 */
sys sys_chroot 1
sys sys_ustat 2
sys sys_dup2 2
sys sys_getppid 0
sys sys_getpgrp 0 /* 4065 */
sys sys_setsid 0
sys sys_sigaction 3
sys sys_sgetmask 0
sys sys_ssetmask 1
sys sys_setreuid 2 /* 4070 */
sys sys_setregid 2
sys sys_sigsuspend 0
sys sys_sigpending 1
sys sys_sethostname 2
sys sys_setrlimit 2 /* 4075 */
sys sys_getrlimit 2
sys sys_getrusage 2
sys sys_gettimeofday 2
sys sys_settimeofday 2
sys sys_getgroups 2 /* 4080 */
sys sys_setgroups 2
sys sys_ni_syscall 0 /* old_select */
sys sys_symlink 2
sys sys_ni_syscall 0 /* was sys_lstat */
sys sys_readlink 3 /* 4085 */
sys sys_uselib 1
sys sys_swapon 2
sys sys_reboot 3
sys old_readdir 3
sys old_mmap 6 /* 4090 */
sys sys_munmap 2
sys sys_truncate 2
sys sys_ftruncate 2
sys sys_fchmod 2
sys sys_fchown 3 /* 4095 */
sys sys_getpriority 2
sys sys_setpriority 3
sys sys_ni_syscall 0
sys sys_statfs 2
sys sys_fstatfs 2 /* 4100 */
sys sys_ni_syscall 0 /* was ioperm(2) */
sys sys_socketcall 2
sys sys_syslog 3
sys sys_setitimer 3
sys sys_getitimer 2 /* 4105 */
sys sys_newstat 2
sys sys_newlstat 2
sys sys_newfstat 2
sys sys_uname 1
sys sys_ni_syscall 0 /* 4110 was iopl(2) */
sys sys_vhangup 0
sys sys_ni_syscall 0 /* was sys_idle() */
sys sys_ni_syscall 0 /* was sys_vm86 */
sys sys_wait4 4
sys sys_swapoff 1 /* 4115 */
sys sys_sysinfo 1
sys sys_ipc 6
sys sys_fsync 1
sys sys_sigreturn 0
sys sys_clone 0 /* 4120 */
sys sys_setdomainname 2
sys sys_newuname 1
sys sys_ni_syscall 0 /* sys_modify_ldt */
sys sys_adjtimex 1
sys sys_mprotect 3 /* 4125 */
sys sys_sigprocmask 3
sys sys_ni_syscall 0 /* was create_module */
sys sys_init_module 5
sys sys_delete_module 1
sys sys_ni_syscall 0 /* 4130 was get_kernel_syms */
sys sys_quotactl 0
sys sys_getpgid 1
sys sys_fchdir 1
sys sys_bdflush 2
sys sys_sysfs 3 /* 4135 */
sys sys_personality 1
sys sys_ni_syscall 0 /* for afs_syscall */
sys sys_setfsuid 1
sys sys_setfsgid 1
sys sys_llseek 5 /* 4140 */
sys sys_getdents 3
sys sys_select 5
sys sys_flock 2
sys sys_msync 3
sys sys_readv 3 /* 4145 */
sys sys_writev 3
sys sys_cacheflush 3
sys sys_cachectl 3
sys sys_sysmips 4
sys sys_ni_syscall 0 /* 4150 */
sys sys_getsid 1
sys sys_fdatasync 0
sys sys_sysctl 1
sys sys_mlock 2
sys sys_munlock 2 /* 4155 */
sys sys_mlockall 1
sys sys_munlockall 0
sys sys_sched_setparam 2
sys sys_sched_getparam 2
sys sys_sched_setscheduler 3 /* 4160 */
sys sys_sched_getscheduler 1
sys sys_sched_yield 0
sys sys_sched_get_priority_max 1
sys sys_sched_get_priority_min 1
sys sys_sched_rr_get_interval 2 /* 4165 */
sys sys_nanosleep, 2
sys sys_mremap, 4
sys sys_accept 3
sys sys_bind 3
sys sys_connect 3 /* 4170 */
sys sys_getpeername 3
sys sys_getsockname 3
sys sys_getsockopt 5
sys sys_listen 2
sys sys_recv 4 /* 4175 */
sys sys_recvfrom 6
sys sys_recvmsg 3
sys sys_send 4
sys sys_sendmsg 3
sys sys_sendto 6 /* 4180 */
sys sys_setsockopt 5
sys sys_shutdown 2
sys sys_socket 3
sys sys_socketpair 4
sys sys_setresuid 3 /* 4185 */
sys sys_getresuid 3
sys sys_ni_syscall 0 /* was sys_query_module */
sys sys_poll 3
sys sys_nfsservctl 3
sys sys_setresgid 3 /* 4190 */
sys sys_getresgid 3
sys sys_prctl 5
sys sys_rt_sigreturn 0
sys sys_rt_sigaction 4
sys sys_rt_sigprocmask 4 /* 4195 */
sys sys_rt_sigpending 2
sys sys_rt_sigtimedwait 4
sys sys_rt_sigqueueinfo 3
sys sys_rt_sigsuspend 0
sys sys_pread64 6 /* 4200 */
sys sys_pwrite64 6
sys sys_chown 3
sys sys_getcwd 2
sys sys_capget 2
sys sys_capset 2 /* 4205 */
sys sys_sigaltstack 0
sys sys_sendfile 4
sys sys_ni_syscall 0
sys sys_ni_syscall 0
sys sys_mmap2 6 /* 4210 */
sys sys_truncate64 4
sys sys_ftruncate64 4
sys sys_stat64 2
sys sys_lstat64 2
sys sys_fstat64 2 /* 4215 */
sys sys_pivot_root 2
sys sys_mincore 3
sys sys_madvise 3
sys sys_getdents64 3
sys sys_fcntl64 3 /* 4220 */
sys sys_ni_syscall 0
sys sys_gettid 0
sys sys_readahead 5
sys sys_setxattr 5
sys sys_lsetxattr 5 /* 4225 */
sys sys_fsetxattr 5
sys sys_getxattr 4
sys sys_lgetxattr 4
sys sys_fgetxattr 4
sys sys_listxattr 3 /* 4230 */
sys sys_llistxattr 3
sys sys_flistxattr 3
sys sys_removexattr 2
sys sys_lremovexattr 2
sys sys_fremovexattr 2 /* 4235 */
sys sys_tkill 2
sys sys_sendfile64 5
sys sys_futex 2
sys sys_sched_setaffinity 3
sys sys_sched_getaffinity 3 /* 4240 */
sys sys_io_setup 2
sys sys_io_destroy 1
sys sys_io_getevents 5
sys sys_io_submit 3
sys sys_io_cancel 3 /* 4245 */
sys sys_exit_group 1
sys sys_lookup_dcookie 3
sys sys_epoll_create 1
sys sys_epoll_ctl 4
sys sys_epoll_wait 3 /* 4250 */
sys sys_remap_file_pages 5
sys sys_set_tid_address 1
sys sys_restart_syscall 0
sys sys_fadvise64_64 7
sys sys_statfs64 3 /* 4255 */
sys sys_fstatfs64 2
sys sys_timer_create 3
sys sys_timer_settime 4
sys sys_timer_gettime 2
sys sys_timer_getoverrun 1 /* 4260 */
sys sys_timer_delete 1
sys sys_clock_settime 2
sys sys_clock_gettime 2
sys sys_clock_getres 2
sys sys_clock_nanosleep 4 /* 4265 */
sys sys_tgkill 3
sys sys_utimes 2
sys sys_ni_syscall 0 /* sys_mbind */
sys sys_ni_syscall 0 /* sys_get_mempolicy */
sys sys_ni_syscall 0 /* 4270 sys_set_mempolicy */
sys sys_mq_open 4
sys sys_mq_unlink 1
sys sys_mq_timedsend 5
sys sys_mq_timedreceive 5
sys sys_mq_notify 2 /* 4275 */
sys sys_mq_getsetattr 3
sys sys_ni_syscall 0 /* sys_vserver */
.endm
.macro sys function, nargs
PTR \function
.endm
.align 3
sys_call_table:
syscalltable
.size sys_call_table, . - sys_call_table
.macro sys function, nargs
.byte \nargs
.endm
sys_narg_table:
syscalltable
.size sys_narg_table, . - sys_narg_table
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