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linux/arch/mips/kernel/scall32-o32.S
Arnaldo Carvalho de Melo a2e2725541 net: Introduce recvmmsg socket syscall 
Meaning receive multiple messages, reducing the number of syscalls and
net stack entry/exit operations.

Next patches will introduce mechanisms where protocols that want to
optimize this operation will provide an unlocked_recvmsg operation.

This takes into account comments made by:

. Paul Moore: sock_recvmsg is called only for the first datagram,
  sock_recvmsg_nosec is used for the rest.

. Caitlin Bestler: recvmmsg now has a struct timespec timeout, that
  works in the same fashion as the ppoll one.

  If the underlying protocol returns a datagram with MSG_OOB set, this
  will make recvmmsg return right away with as many datagrams (+ the OOB
  one) it has received so far.

. Rémi Denis-Courmont & Steven Whitehouse: If we receive N < vlen
  datagrams and then recvmsg returns an error, recvmmsg will return
  the successfully received datagrams, store the error and return it
  in the next call.

This paves the way for a subsequent optimization, sk_prot->unlocked_recvmsg,
where we will be able to acquire the lock only at batch start and end, not at
every underlying recvmsg call.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-12 23:40:10 -07:00

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/*
* 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) 1995-99, 2000- 02, 06 Ralf Baechle <ralf@linux-mips.org>
* Copyright (C) 2001 MIPS Technologies, Inc.
* Copyright (C) 2004 Thiemo Seufer
*/
#include <linux/errno.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/irqflags.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/war.h>
#include <asm/asm-offsets.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
TRACE_IRQS_ON_RELOAD
STI
.set at
lw t1, PT_EPC(sp) # skip syscall on return
subu v0, v0, __NR_O32_Linux # check syscall number
sltiu t0, v0, __NR_O32_Linux_syscalls + 1
addiu t1, 4 # skip to next instruction
sw t1, PT_EPC(sp)
beqz t0, illegal_syscall
sll t0, v0, 3
la t1, sys_call_table
addu t1, t0
lw t2, (t1) # syscall routine
lw t3, 4(t1) # >= 0 if we need stack arguments
beqz t2, illegal_syscall
sw a3, PT_R26(sp) # save a3 for syscall restarting
bgez t3, stackargs
stack_done:
lw t0, TI_FLAGS($28) # syscall tracing enabled?
li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
and t0, t1
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
o32_syscall_exit:
local_irq_disable # make sure need_resched and
# signals dont change between
# sampling and return
lw a2, TI_FLAGS($28) # current->work
li t0, _TIF_ALLWORK_MASK
and t0, a2
bnez t0, o32_syscall_exit_work
j restore_partial
o32_syscall_exit_work:
j syscall_exit_work_partial
/* ------------------------------------------------------------------------ */
syscall_trace_entry:
SAVE_STATIC
move s0, t2
move a0, sp
li a1, 0
jal do_syscall_trace
move t0, s0
RESTORE_STATIC
lw a0, PT_R4(sp) # Restore argument registers
lw a1, PT_R5(sp)
lw a2, PT_R6(sp)
lw a3, PT_R7(sp)
jalr t0
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
/*
* We intentionally keep the kernel stack a little below the top of
* userspace so we don't have to do a slower byte accurate check here.
*/
lw t5, TI_ADDR_LIMIT($28)
addu t4, t0, 32
and t5, t4
bltz t5, bad_stack # -> sp is bad
/* Ok, copy the args from the luser stack to the kernel stack.
* t3 is the precomputed number of instruction bytes needed to
* load or store arguments 6-8.
*/
la t1, 5f # load up to 3 arguments
subu t1, t3
1: lw t5, 16(t0) # argument #5 from usp
.set push
.set noreorder
.set nomacro
jr t1
addiu t1, 6f - 5f
2: lw t8, 28(t0) # argument #8 from usp
3: lw t7, 24(t0) # argument #7 from usp
4: lw t6, 20(t0) # argument #6 from usp
5: jr t1
sw t5, 16(sp) # argument #5 to ksp
sw t8, 28(sp) # argument #8 to ksp
sw t7, 24(sp) # argument #7 to ksp
sw t6, 20(sp) # argument #6 to ksp
6: j stack_done # go back
nop
.set pop
.section __ex_table,"a"
PTR 1b,bad_stack
PTR 2b,bad_stack
PTR 3b,bad_stack
PTR 4b,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(sys_syscall)
subu t0, a0, __NR_O32_Linux # check syscall number
sltiu v0, t0, __NR_O32_Linux_syscalls + 1
beqz t0, einval # do not recurse
sll t1, t0, 3
beqz v0, einval
lw t2, sys_call_table(t1) # syscall routine
/* Some syscalls like execve get their arguments from struct pt_regs
and claim zero arguments in the syscall table. Thus we have to
assume the worst case and shuffle around all potential arguments.
If you want performance, don't use indirect syscalls. */
move a0, a1 # shift argument registers
move a1, a2
move a2, a3
lw a3, 16(sp)
lw t4, 20(sp)
lw t5, 24(sp)
lw t6, 28(sp)
sw t4, 16(sp)
sw t5, 20(sp)
sw t6, 24(sp)
sw a0, PT_R4(sp) # .. and push back a0 - a3, some
sw a1, PT_R5(sp) # syscalls expect them there
sw a2, PT_R6(sp)
sw a3, PT_R7(sp)
sw a3, PT_R26(sp) # update a3 for syscall restarting
jr t2
/* Unreached */
einval: li v0, -ENOSYS
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
sys sys_syscall 8 /* 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 sysm_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 1
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 sys_old_readdir 3
sys sys_mips_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 4
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 1
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, 5
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_mips_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 6
#ifdef CONFIG_MIPS_MT_FPAFF
/*
* For FPU affinity scheduling on MIPS MT processors, we need to
* intercept sys_sched_xxxaffinity() calls until we get a proper hook
* in kernel/sched.c. Considered only temporary we only support these
* hooks for the 32-bit kernel - there is no MIPS64 MT processor atm.
*/
sys mipsmt_sys_sched_setaffinity 3
sys mipsmt_sys_sched_getaffinity 3
#else
sys sys_sched_setaffinity 3
sys sys_sched_getaffinity 3 /* 4240 */
#endif /* CONFIG_MIPS_MT_FPAFF */
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 4
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_mbind 4
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 */
sys sys_waitid 5
sys sys_ni_syscall 0 /* available, was setaltroot */
sys sys_add_key 5 /* 4280 */
sys sys_request_key 4
sys sys_keyctl 5
sys sys_set_thread_area 1
sys sys_inotify_init 0
sys sys_inotify_add_watch 3 /* 4285 */
sys sys_inotify_rm_watch 2
sys sys_migrate_pages 4
sys sys_openat 4
sys sys_mkdirat 3
sys sys_mknodat 4 /* 4290 */
sys sys_fchownat 5
sys sys_futimesat 3
sys sys_fstatat64 4
sys sys_unlinkat 3
sys sys_renameat 4 /* 4295 */
sys sys_linkat 5
sys sys_symlinkat 3
sys sys_readlinkat 4
sys sys_fchmodat 3
sys sys_faccessat 3 /* 4300 */
sys sys_pselect6 6
sys sys_ppoll 5
sys sys_unshare 1
sys sys_splice 6
sys sys_sync_file_range 7 /* 4305 */
sys sys_tee 4
sys sys_vmsplice 4
sys sys_move_pages 6
sys sys_set_robust_list 2
sys sys_get_robust_list 3 /* 4310 */
sys sys_kexec_load 4
sys sys_getcpu 3
sys sys_epoll_pwait 6
sys sys_ioprio_set 3
sys sys_ioprio_get 2 /* 4315 */
sys sys_utimensat 4
sys sys_signalfd 3
sys sys_ni_syscall 0
sys sys_eventfd 1
sys sys_fallocate 6 /* 4320 */
sys sys_timerfd_create 2
sys sys_timerfd_gettime 2
sys sys_timerfd_settime 4
sys sys_signalfd4 4
sys sys_eventfd2 2 /* 4325 */
sys sys_epoll_create1 1
sys sys_dup3 3
sys sys_pipe2 2
sys sys_inotify_init1 1
sys sys_preadv 6 /* 4330 */
sys sys_pwritev 6
sys sys_rt_tgsigqueueinfo 4
sys sys_perf_event_open 5
sys sys_accept4 4
sys sys_recvmmsg 5
.endm
/* We pre-compute the number of _instruction_ bytes needed to
load or store the arguments 6-8. Negative values are ignored. */
.macro sys function, nargs
PTR \function
LONG (\nargs << 2) - (5 << 2)
.endm
.align 3
.type sys_call_table,@object
EXPORT(sys_call_table)
syscalltable
.size sys_call_table, . - sys_call_table
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