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android_kernel_motorola_sm6225/arch/mips/kernel/scall32-o32.S
Ulrich Drepper c04030e16d [PATCH] flags parameter for linkat 
I'm currently at the POSIX meeting and one thing covered was the
incompatibility of Linux's link() with the POSIX definition.  The name.
Linux does not follow symlinks, POSIX requires it does.

Even if somebody thinks this is a good default behavior we cannot change this
because it would break the ABI.  But the fact remains that some application
might want this behavior.

We have one chance to help implementing this without breaking the behavior.
 For this we could use the new linkat interface which would need a new
flags parameter.  If the new parameter is AT_SYMLINK_FOLLOW the new
behavior could be invoked.

I do not want to introduce such a patch now.  But we could add the
parameter now, just don't use it.  The patch below would do this.  Can we
get this late patch applied before the release more or less fixes the
syscall API?

Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-02-24 14:31:39 -08:00

651 lines
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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, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle
* Copyright (C) 2001 MIPS Technologies, Inc.
* Copyright (C) 2004 Thiemo Seufer
*/
#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/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
STI
.set at
lw t1, PT_EPC(sp) # skip syscall on return
#if defined(CONFIG_BINFMT_IRIX)
sltiu t0, v0, MAX_SYSCALL_NO + 1 # check syscall number
#else
subu v0, v0, __NR_O32_Linux # check syscall number
sltiu t0, v0, __NR_O32_Linux_syscalls + 1
#endif
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(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)
#if R10000_LLSC_WAR
beqzl a0, 1b
#else
beqz a0, 1b
#endif
.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
j o32_syscall_exit # continue like a normal syscall
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)
#if defined(CONFIG_BINFMT_IRIX)
sltiu v0, a0, MAX_SYSCALL_NO + 1 # check syscall number
#else
subu t0, a0, __NR_O32_Linux # check syscall number
sltiu v0, t0, __NR_O32_Linux_syscalls + 1
#endif
sll t1, t0, 3
beqz v0, einval
lw t2, sys_call_table(t1) # syscall routine
#if defined(CONFIG_BINFMT_IRIX)
li v1, 4000 # nr of sys_syscall
#else
li v1, 4000 - __NR_O32_Linux # index of sys_syscall
#endif
beq t0, v1, einval # do not recurse
/* 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, -EINVAL
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
#if defined(CONFIG_BINFMT_IRIX)
mille sys_ni_syscall 0 /* 0 - 999 SVR4 flavour */
mille sys_ni_syscall 0 /* 1000 - 1999 32-bit IRIX */
mille sys_ni_syscall 0 /* 2000 - 2999 BSD43 flavour */
mille sys_ni_syscall 0 /* 3000 - 3999 POSIX flavour */
#endif
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 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 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 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 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, 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 6
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 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
.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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