diff options
Diffstat (limited to 'arch/mips/kernel/scall32-o32.S')
| -rw-r--r-- | arch/mips/kernel/scall32-o32.S | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S new file mode 100644 index 00000000000..344f2e29eb6 --- /dev/null +++ b/arch/mips/kernel/scall32-o32.S @@ -0,0 +1,641 @@ +/* + * 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/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 + +#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 + + lw a0, PT_R4(sp) # Restore argument registers + lw a1, PT_R5(sp) + lw a2, PT_R6(sp) + lw a3, PT_R7(sp) + jalr s0 + + 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 + + /* Success, so skip usual error handling garbage. */ + lw a2, TI_FLAGS($28) # syscall tracing enabled? + li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT + and t0, a2, t0 + bnez t0, 1f + + j 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) +#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 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_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 4 + sys sys_ni_syscall 0 /* available, was setaltroot */ + sys sys_add_key 5 + sys sys_request_key 4 + sys sys_keyctl 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 |