/*
* 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 - 2000 by Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*
* Hairy, the userspace application uses a different argument passing
* convention than the kernel, so we have to translate things from o32
* to ABI64 calling convention. 64-bit syscalls are also processed
* here for now.
*/
#include <asm/asm.h>
#include <linux/errno.h>
#include <asm/current.h>
#include <asm/mipsregs.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
#include <asm/unistd.h>
/* This duplicates the definition from <linux/sched.h> */
#define PT_TRACESYS 0x00000002 /* tracing system calls */
/* This duplicates the definition from <asm/signal.h> */
#define SIGILL 4 /* Illegal instruction (ANSI). */
/* Highest syscall used of any syscall flavour */
#define MAX_SYSCALL_NO __NR_Linux32 + __NR_Linux32_syscalls
.align 5
NESTED(handle_sys, PT_SIZE, sp)
.set noat
SAVE_SOME
STI
.set at
#if DEBUG_MIPS64
jal dodebug
ld $4, PT_R4(sp)
ld $5, PT_R5(sp)
ld $6, PT_R6(sp)
ld $7, PT_R7(sp)
ld $2, PT_R2(sp)
#endif
ld t1, PT_EPC(sp) # skip syscall on return
subu t0, v0, __NR_Linux32 # check syscall number
sltiu t0, t0, __NR_Linux32_syscalls + 1
daddiu t1, 4 # skip to next instruction
beqz t0, not_o32_scall
sd t1, PT_EPC(sp)
/* XXX Put both in one cacheline, should save a bit. */
dsll t0, v0, 3 # offset into table
ld t2, (sys_call_table - (__NR_Linux32 * 8))(t0) # syscall routine
lbu t3, (sys_narg_table - __NR_Linux32)(v0) # number of arguments
subu t0, t3, 5 # 5 or more arguments?
sd a3, PT_R26(sp) # save a3 for syscall restarting
bgez t0, stackargs
stack_done:
ld t0, TASK_PTRACE($28) # syscall tracing enabled?
andi t0, PT_TRACESYS
bnez t0, trace_a_syscall
jalr t2 # Do The Real Thing (TM)
li t0, -EMAXERRNO - 1 # error?
sltu t0, t0, v0
sd t0, PT_R7(sp) # set error flag
beqz t0, 1f
negu v0 # error
sd v0, PT_R0(sp) # set flag for syscall restarting
1: sd v0, PT_R2(sp) # result
FEXPORT(o32_ret_from_sys_call)
la t1, irq_stat # softirq_active
#ifdef CONFIG_SMP
lwu t0, TASK_PROCESSOR($28)
dsll t0, t0, 5
daddu t1, t0
#endif
lw t0, 0(t1) # softirq_active
lw t1, 4(t1) # softirq_mask. unused delay slot
and t0, t1
bnez t0, o32_handle_softirq
9: ld t0,PT_STATUS(sp) # returning to kernel mode?
andi t1, t0, 0x10
ld t2, TASK_NEED_RESCHED($28)
beqz t1, o32_return # -> yes
bnez t2, o32_reschedule
lw v0, TASK_SIGPENDING($28)
move a0, zero
beqz v0, o32_return
move a1, sp
SAVE_STATIC
jal do_signal
o32_return:
RESTORE_SOME
RESTORE_SP
.set mips3
eret
.set mips0
o32_handle_softirq:
jal do_softirq
b 9b
o32_reschedule:
SAVE_STATIC
jal schedule
b o32_ret_from_sys_call
/* ------------------------------------------------------------------------ */
trace_a_syscall:
SAVE_STATIC
sd a4, PT_R8(sp)
sd a5, PT_R9(sp)
sd a6, PT_R10(sp)
sd a7, PT_R11(sp)
sd t2,PT_R1(sp)
jal syscall_trace
ld t2,PT_R1(sp)
ld a0, PT_R4(sp) # Restore argument registers
ld a1, PT_R5(sp)
ld a2, PT_R6(sp)
ld a3, PT_R7(sp)
ld a4, PT_R8(sp)
ld a5, PT_R9(sp)
jalr t2
li t0, -EMAXERRNO - 1 # error?
sltu t0, t0, v0
sd t0, PT_R7(sp) # set error flag
beqz t0, 1f
negu v0 # error
sd v0, PT_R0(sp) # set flag for syscall restarting
1: sd v0, PT_R2(sp) # result
jal syscall_trace
j o32_ret_from_sys_call
/* ------------------------------------------------------------------------ */
/*
* 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:
ld 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
ld t0, PT_R29(sp) # get old user stack pointer
la t1, 3f # copy 1 to 2 arguments
sll t3, t3, 2
subu t1, t3
jr t1
/* Ok, copy the args from the luser stack to the kernel stack */
1: lw a5, 20(t0) # argument #6 from usp
2: lw a4, 16(t0) # argument #5 from usp
3: j stack_done # go back
.section __ex_table,"a"
PTR 1b, bad_stack
PTR 2b, bad_stack
.previous
/*
* The stackpointer for a call with more than 4 arguments is bad.
*/
bad_stack:
negu v0 # error
sd v0, PT_R0(sp)
sd v0, PT_R2(sp)
li t0, 1 # set error flag
sd t0, PT_R7(sp)
j ret_from_sys_call
not_o32_scall:
/* This is not an 32-bit compatibility syscall, pass it on to
the 64-bit syscall handlers. */
j handle_sys64
illegal_syscall:
/* This also isn't a 64-bit syscall, throw an error. */
li v0, ENOSYS # error
sd v0, PT_R2(sp)
li t0, 1 # set error flag
sd t0, PT_R7(sp)
j ret_from_sys_call
END(handle_sys)
.macro syscalltable
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 sys32_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_stat 2
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 sys32_ptrace 4
sys sys32_alarm 1
sys sys_fstat 2
sys sys_pause 0
sys sys32_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 sys32_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 sys32_ioctl 3
sys sys32_fcntl 3 /* 4055 */
sys sys_ni_syscall 2
sys sys_setpgid 2
sys sys_ni_syscall, 0
sys sys_ni_syscall 0 /* was sys_olduname */
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 sys32_sigaction 3
sys sys_sgetmask 0
sys sys_ssetmask 1
sys sys_setreuid 2 /* 4070 */
sys sys_setregid 2
sys sys32_sigsuspend 0
sys sys32_sigpending 1
sys sys_sethostname 2
sys sys32_setrlimit 2 /* 4075 */
sys sys32_getrlimit 2
sys sys32_getrusage 2
sys sys32_gettimeofday 2
sys sys32_settimeofday 2
sys sys_getgroups 2 /* 4080 */
sys sys_setgroups 2
sys sys_ni_syscall 0 /* old_select */
sys sys_symlink 2
sys sys_lstat 2
sys sys_readlink 3 /* 4085 */
sys sys_uselib 1
sys sys_swapon 2
sys sys_reboot 3
sys sys32_readdir 3
sys sys_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 sys32_statfs 2
sys sys32_fstatfs 2 /* 4100 */
sys sys_ni_syscall 0 /* sys_ioperm */
sys sys_socketcall 2
sys sys_syslog 3
sys sys32_setitimer 3
sys sys32_getitimer 2 /* 4105 */
sys sys32_newstat 2
sys sys32_newlstat 2
sys sys32_newfstat 2
sys sys_ni_syscall 0 /* was sys_uname */
sys sys_ni_syscall 0 /* sys_ioperm *//* 4110 */
sys sys_vhangup 0
sys sys_ni_syscall 0 /* was sys_idle */
sys sys_ni_syscall 0 /* sys_vm86 */
sys sys32_wait4 4
sys sys_swapoff 1 /* 4115 */
sys sys_sysinfo 1
sys sys32_ipc 6
sys sys_fsync 1
sys sys32_sigreturn 0
sys sys_clone 0 /* 4120 */
sys sys_setdomainname 2
sys sys32_newuname 1
sys sys_ni_syscall 0 /* sys_modify_ldt */
sys sys32_adjtimex 1
sys sys_mprotect 3 /* 4125 */
sys sys32_sigprocmask 3
sys sys_create_module 2
sys sys_init_module 5
sys sys_delete_module 1
sys sys_get_kernel_syms 1 /* 4130 */
sys sys_quotactl 0
sys sys_getpgid 1
sys sys_fchdir 1
sys sys_bdflush 2
sys sys_sysfs 3 /* 4135 */
sys sys32_personality 1
sys sys_ni_syscall 0 /* for afs_syscall */
sys sys_setfsuid 1
sys sys_setfsgid 1
sys sys32_llseek 5 /* 4140 */
sys sys32_getdents 3
sys sys32_select 5
sys sys_flock 2
sys sys_msync 3
sys sys32_readv 3 /* 4145 */
sys sys32_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 sys32_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 sys32_sched_rr_get_interval 2 /* 4165 */
sys sys32_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 sys32_recvmsg 3
sys sys_send 4
sys sys32_sendmsg 3
sys sys_sendto 6 /* 4180 */
sys sys32_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_query_module 5
sys sys_poll 3
sys sys_nfsservctl 3
sys sys_setresgid 3 /* 4190 */
sys sys_getresgid 3
sys sys_prctl 5
sys sys32_rt_sigreturn 0
sys sys32_rt_sigaction 4
sys sys32_rt_sigprocmask 4 /* 4195 */
sys sys32_rt_sigpending 2
sys sys32_rt_sigtimedwait 4
sys sys32_rt_sigqueueinfo 3
sys sys32_rt_sigsuspend 0
sys sys32_pread 6 /* 4200 */
sys sys32_pwrite 6
sys sys_chown 3
sys sys_getcwd 2
sys sys_capget 2
sys sys_capset 2 /* 4205 */
sys sys32_sigaltstack 0
sys sys_sendfile 3
sys sys_ni_syscall 0
sys sys_ni_syscall 0
sys sys_mmap2 6 /* 4210 */
sys sys_truncate64 2
sys sys_ftruncate64 2
sys sys_newstat 2
sys sys_newlstat 2
sys sys_newfstat 2 /* 4215 */
sys sys_pivot_root 2
sys sys_mincore 3
sys sys_madvise 3
sys sys_getdents64 3
sys sys32_fcntl64 3 /* 4220 */
.endm
.macro sys function, nargs
PTR \function
.endm
sys_call_table:
syscalltable
.macro sys function, nargs
.byte \nargs
.endm
sys_narg_table:
syscalltable