| /* |
| * 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 |
| * Copyright (C) 2014 Imagination Technologies Ltd. |
| */ |
| #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 |
| addiu t1, 4 # skip to next instruction |
| sw t1, PT_EPC(sp) |
| |
| sw a3, PT_R26(sp) # save a3 for syscall restarting |
| |
| /* |
| * 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). |
| */ |
| 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. |
| */ |
| |
| .set push |
| .set noreorder |
| .set nomacro |
| |
| load_a4: user_lw(t5, 16(t0)) # argument #5 from usp |
| load_a5: user_lw(t6, 20(t0)) # argument #6 from usp |
| load_a6: user_lw(t7, 24(t0)) # argument #7 from usp |
| load_a7: user_lw(t8, 28(t0)) # argument #8 from usp |
| loads_done: |
| |
| sw t5, 16(sp) # argument #5 to ksp |
| sw t6, 20(sp) # argument #6 to ksp |
| sw t7, 24(sp) # argument #7 to ksp |
| sw t8, 28(sp) # argument #8 to ksp |
| .set pop |
| |
| .section __ex_table,"a" |
| PTR load_a4, bad_stack_a4 |
| PTR load_a5, bad_stack_a5 |
| PTR load_a6, bad_stack_a6 |
| PTR load_a7, bad_stack_a7 |
| .previous |
| |
| lw t0, TI_FLAGS($28) # syscall tracing enabled? |
| li t1, _TIF_WORK_SYSCALL_ENTRY |
| and t0, t1 |
| bnez t0, syscall_trace_entry # -> yes |
| syscall_common: |
| sltiu t0, v0, __NR_O32_Linux_syscalls + 1 |
| beqz t0, illegal_syscall |
| |
| sll t0, v0, 2 |
| la t1, sys_call_table |
| addu t1, t0 |
| lw t2, (t1) # syscall routine |
| |
| beqz t2, illegal_syscall |
| |
| 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 |
| |
| lw t1, PT_R2(sp) # syscall number |
| negu v0 # error |
| sw t1, PT_R0(sp) # save it for syscall restarting |
| 1: sw v0, PT_R2(sp) # result |
| |
| o32_syscall_exit: |
| j syscall_exit_partial |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| syscall_trace_entry: |
| SAVE_STATIC |
| move s0, v0 |
| move a0, sp |
| |
| /* |
| * syscall number is in v0 unless we called syscall(__NR_###) |
| * where the real syscall number is in a0 |
| */ |
| addiu a1, v0, __NR_O32_Linux |
| bnez v0, 1f /* __NR_syscall at offset 0 */ |
| lw a1, PT_R4(sp) |
| |
| 1: jal syscall_trace_enter |
| |
| bltz v0, 1f # seccomp failed? Skip syscall |
| |
| move v0, s0 # restore syscall |
| |
| 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) |
| j syscall_common |
| |
| 1: j syscall_exit |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| /* |
| * Our open-coded access area sanity test for the stack pointer |
| * failed. We probably should handle this case a bit more drastic. |
| */ |
| bad_stack: |
| li v0, EFAULT |
| sw v0, PT_R2(sp) |
| li t0, 1 # set error flag |
| sw t0, PT_R7(sp) |
| j o32_syscall_exit |
| |
| bad_stack_a4: |
| li t5, 0 |
| b load_a5 |
| |
| bad_stack_a5: |
| li t6, 0 |
| b load_a6 |
| |
| bad_stack_a6: |
| li t7, 0 |
| b load_a7 |
| |
| bad_stack_a7: |
| li t8, 0 |
| b loads_done |
| |
| /* |
| * 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, 2 |
| beqz v0, einval |
| lw t2, sys_call_table(t1) # syscall routine |
| sw a0, PT_R2(sp) # call routine directly on restart |
| |
| /* 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) |
| |
| .align 2 |
| .type sys_call_table, @object |
| EXPORT(sys_call_table) |
| PTR sys_syscall /* 4000 */ |
| PTR sys_exit |
| PTR __sys_fork |
| PTR sys_read |
| PTR sys_write |
| PTR sys_open /* 4005 */ |
| PTR sys_close |
| PTR sys_waitpid |
| PTR sys_creat |
| PTR sys_link |
| PTR sys_unlink /* 4010 */ |
| PTR sys_execve |
| PTR sys_chdir |
| PTR sys_time |
| PTR sys_mknod |
| PTR sys_chmod /* 4015 */ |
| PTR sys_lchown |
| PTR sys_ni_syscall |
| PTR sys_ni_syscall /* was sys_stat */ |
| PTR sys_lseek |
| PTR sys_getpid /* 4020 */ |
| PTR sys_mount |
| PTR sys_oldumount |
| PTR sys_setuid |
| PTR sys_getuid |
| PTR sys_stime /* 4025 */ |
| PTR sys_ptrace |
| PTR sys_alarm |
| PTR sys_ni_syscall /* was sys_fstat */ |
| PTR sys_pause |
| PTR sys_utime /* 4030 */ |
| PTR sys_ni_syscall |
| PTR sys_ni_syscall |
| PTR sys_access |
| PTR sys_nice |
| PTR sys_ni_syscall /* 4035 */ |
| PTR sys_sync |
| PTR sys_kill |
| PTR sys_rename |
| PTR sys_mkdir |
| PTR sys_rmdir /* 4040 */ |
| PTR sys_dup |
| PTR sysm_pipe |
| PTR sys_times |
| PTR sys_ni_syscall |
| PTR sys_brk /* 4045 */ |
| PTR sys_setgid |
| PTR sys_getgid |
| PTR sys_ni_syscall /* was signal(2) */ |
| PTR sys_geteuid |
| PTR sys_getegid /* 4050 */ |
| PTR sys_acct |
| PTR sys_umount |
| PTR sys_ni_syscall |
| PTR sys_ioctl |
| PTR sys_fcntl /* 4055 */ |
| PTR sys_ni_syscall |
| PTR sys_setpgid |
| PTR sys_ni_syscall |
| PTR sys_olduname |
| PTR sys_umask /* 4060 */ |
| PTR sys_chroot |
| PTR sys_ustat |
| PTR sys_dup2 |
| PTR sys_getppid |
| PTR sys_getpgrp /* 4065 */ |
| PTR sys_setsid |
| PTR sys_sigaction |
| PTR sys_sgetmask |
| PTR sys_ssetmask |
| PTR sys_setreuid /* 4070 */ |
| PTR sys_setregid |
| PTR sys_sigsuspend |
| PTR sys_sigpending |
| PTR sys_sethostname |
| PTR sys_setrlimit /* 4075 */ |
| PTR sys_getrlimit |
| PTR sys_getrusage |
| PTR sys_gettimeofday |
| PTR sys_settimeofday |
| PTR sys_getgroups /* 4080 */ |
| PTR sys_setgroups |
| PTR sys_ni_syscall /* old_select */ |
| PTR sys_symlink |
| PTR sys_ni_syscall /* was sys_lstat */ |
| PTR sys_readlink /* 4085 */ |
| PTR sys_uselib |
| PTR sys_swapon |
| PTR sys_reboot |
| PTR sys_old_readdir |
| PTR sys_mips_mmap /* 4090 */ |
| PTR sys_munmap |
| PTR sys_truncate |
| PTR sys_ftruncate |
| PTR sys_fchmod |
| PTR sys_fchown /* 4095 */ |
| PTR sys_getpriority |
| PTR sys_setpriority |
| PTR sys_ni_syscall |
| PTR sys_statfs |
| PTR sys_fstatfs /* 4100 */ |
| PTR sys_ni_syscall /* was ioperm(2) */ |
| PTR sys_socketcall |
| PTR sys_syslog |
| PTR sys_setitimer |
| PTR sys_getitimer /* 4105 */ |
| PTR sys_newstat |
| PTR sys_newlstat |
| PTR sys_newfstat |
| PTR sys_uname |
| PTR sys_ni_syscall /* 4110 was iopl(2) */ |
| PTR sys_vhangup |
| PTR sys_ni_syscall /* was sys_idle() */ |
| PTR sys_ni_syscall /* was sys_vm86 */ |
| PTR sys_wait4 |
| PTR sys_swapoff /* 4115 */ |
| PTR sys_sysinfo |
| PTR sys_ipc |
| PTR sys_fsync |
| PTR sys_sigreturn |
| PTR __sys_clone /* 4120 */ |
| PTR sys_setdomainname |
| PTR sys_newuname |
| PTR sys_ni_syscall /* sys_modify_ldt */ |
| PTR sys_adjtimex |
| PTR sys_mprotect /* 4125 */ |
| PTR sys_sigprocmask |
| PTR sys_ni_syscall /* was create_module */ |
| PTR sys_init_module |
| PTR sys_delete_module |
| PTR sys_ni_syscall /* 4130 was get_kernel_syms */ |
| PTR sys_quotactl |
| PTR sys_getpgid |
| PTR sys_fchdir |
| PTR sys_bdflush |
| PTR sys_sysfs /* 4135 */ |
| PTR sys_personality |
| PTR sys_ni_syscall /* for afs_syscall */ |
| PTR sys_setfsuid |
| PTR sys_setfsgid |
| PTR sys_llseek /* 4140 */ |
| PTR sys_getdents |
| PTR sys_select |
| PTR sys_flock |
| PTR sys_msync |
| PTR sys_readv /* 4145 */ |
| PTR sys_writev |
| PTR sys_cacheflush |
| PTR sys_cachectl |
| PTR sys_sysmips |
| PTR sys_ni_syscall /* 4150 */ |
| PTR sys_getsid |
| PTR sys_fdatasync |
| PTR sys_sysctl |
| PTR sys_mlock |
| PTR sys_munlock /* 4155 */ |
| PTR sys_mlockall |
| PTR sys_munlockall |
| PTR sys_sched_setparam |
| PTR sys_sched_getparam |
| PTR sys_sched_setscheduler /* 4160 */ |
| PTR sys_sched_getscheduler |
| PTR sys_sched_yield |
| PTR sys_sched_get_priority_max |
| PTR sys_sched_get_priority_min |
| PTR sys_sched_rr_get_interval /* 4165 */ |
| PTR sys_nanosleep |
| PTR sys_mremap |
| PTR sys_accept |
| PTR sys_bind |
| PTR sys_connect /* 4170 */ |
| PTR sys_getpeername |
| PTR sys_getsockname |
| PTR sys_getsockopt |
| PTR sys_listen |
| PTR sys_recv /* 4175 */ |
| PTR sys_recvfrom |
| PTR sys_recvmsg |
| PTR sys_send |
| PTR sys_sendmsg |
| PTR sys_sendto /* 4180 */ |
| PTR sys_setsockopt |
| PTR sys_shutdown |
| PTR sys_socket |
| PTR sys_socketpair |
| PTR sys_setresuid /* 4185 */ |
| PTR sys_getresuid |
| PTR sys_ni_syscall /* was sys_query_module */ |
| PTR sys_poll |
| PTR sys_ni_syscall /* was nfsservctl */ |
| PTR sys_setresgid /* 4190 */ |
| PTR sys_getresgid |
| PTR sys_prctl |
| PTR sys_rt_sigreturn |
| PTR sys_rt_sigaction |
| PTR sys_rt_sigprocmask /* 4195 */ |
| PTR sys_rt_sigpending |
| PTR sys_rt_sigtimedwait |
| PTR sys_rt_sigqueueinfo |
| PTR sys_rt_sigsuspend |
| PTR sys_pread64 /* 4200 */ |
| PTR sys_pwrite64 |
| PTR sys_chown |
| PTR sys_getcwd |
| PTR sys_capget |
| PTR sys_capset /* 4205 */ |
| PTR sys_sigaltstack |
| PTR sys_sendfile |
| PTR sys_ni_syscall |
| PTR sys_ni_syscall |
| PTR sys_mips_mmap2 /* 4210 */ |
| PTR sys_truncate64 |
| PTR sys_ftruncate64 |
| PTR sys_stat64 |
| PTR sys_lstat64 |
| PTR sys_fstat64 /* 4215 */ |
| PTR sys_pivot_root |
| PTR sys_mincore |
| PTR sys_madvise |
| PTR sys_getdents64 |
| PTR sys_fcntl64 /* 4220 */ |
| PTR sys_ni_syscall |
| PTR sys_gettid |
| PTR sys_readahead |
| PTR sys_setxattr |
| PTR sys_lsetxattr /* 4225 */ |
| PTR sys_fsetxattr |
| PTR sys_getxattr |
| PTR sys_lgetxattr |
| PTR sys_fgetxattr |
| PTR sys_listxattr /* 4230 */ |
| PTR sys_llistxattr |
| PTR sys_flistxattr |
| PTR sys_removexattr |
| PTR sys_lremovexattr |
| PTR sys_fremovexattr /* 4235 */ |
| PTR sys_tkill |
| PTR sys_sendfile64 |
| PTR sys_futex |
| #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/core.c. Considered only temporary we only support |
| * these hooks for the 32-bit kernel - there is no MIPS64 MT processor |
| * atm. |
| */ |
| PTR mipsmt_sys_sched_setaffinity |
| PTR mipsmt_sys_sched_getaffinity |
| #else |
| PTR sys_sched_setaffinity |
| PTR sys_sched_getaffinity /* 4240 */ |
| #endif /* CONFIG_MIPS_MT_FPAFF */ |
| PTR sys_io_setup |
| PTR sys_io_destroy |
| PTR sys_io_getevents |
| PTR sys_io_submit |
| PTR sys_io_cancel /* 4245 */ |
| PTR sys_exit_group |
| PTR sys_lookup_dcookie |
| PTR sys_epoll_create |
| PTR sys_epoll_ctl |
| PTR sys_epoll_wait /* 4250 */ |
| PTR sys_remap_file_pages |
| PTR sys_set_tid_address |
| PTR sys_restart_syscall |
| PTR sys_fadvise64_64 |
| PTR sys_statfs64 /* 4255 */ |
| PTR sys_fstatfs64 |
| PTR sys_timer_create |
| PTR sys_timer_settime |
| PTR sys_timer_gettime |
| PTR sys_timer_getoverrun /* 4260 */ |
| PTR sys_timer_delete |
| PTR sys_clock_settime |
| PTR sys_clock_gettime |
| PTR sys_clock_getres |
| PTR sys_clock_nanosleep /* 4265 */ |
| PTR sys_tgkill |
| PTR sys_utimes |
| PTR sys_mbind |
| PTR sys_get_mempolicy |
| PTR sys_set_mempolicy /* 4270 */ |
| PTR sys_mq_open |
| PTR sys_mq_unlink |
| PTR sys_mq_timedsend |
| PTR sys_mq_timedreceive |
| PTR sys_mq_notify /* 4275 */ |
| PTR sys_mq_getsetattr |
| PTR sys_ni_syscall /* sys_vserver */ |
| PTR sys_waitid |
| PTR sys_ni_syscall /* available, was setaltroot */ |
| PTR sys_add_key /* 4280 */ |
| PTR sys_request_key |
| PTR sys_keyctl |
| PTR sys_set_thread_area |
| PTR sys_inotify_init |
| PTR sys_inotify_add_watch /* 4285 */ |
| PTR sys_inotify_rm_watch |
| PTR sys_migrate_pages |
| PTR sys_openat |
| PTR sys_mkdirat |
| PTR sys_mknodat /* 4290 */ |
| PTR sys_fchownat |
| PTR sys_futimesat |
| PTR sys_fstatat64 |
| PTR sys_unlinkat |
| PTR sys_renameat /* 4295 */ |
| PTR sys_linkat |
| PTR sys_symlinkat |
| PTR sys_readlinkat |
| PTR sys_fchmodat |
| PTR sys_faccessat /* 4300 */ |
| PTR sys_pselect6 |
| PTR sys_ppoll |
| PTR sys_unshare |
| PTR sys_splice |
| PTR sys_sync_file_range /* 4305 */ |
| PTR sys_tee |
| PTR sys_vmsplice |
| PTR sys_move_pages |
| PTR sys_set_robust_list |
| PTR sys_get_robust_list /* 4310 */ |
| PTR sys_kexec_load |
| PTR sys_getcpu |
| PTR sys_epoll_pwait |
| PTR sys_ioprio_set |
| PTR sys_ioprio_get /* 4315 */ |
| PTR sys_utimensat |
| PTR sys_signalfd |
| PTR sys_ni_syscall /* was timerfd */ |
| PTR sys_eventfd |
| PTR sys_fallocate /* 4320 */ |
| PTR sys_timerfd_create |
| PTR sys_timerfd_gettime |
| PTR sys_timerfd_settime |
| PTR sys_signalfd4 |
| PTR sys_eventfd2 /* 4325 */ |
| PTR sys_epoll_create1 |
| PTR sys_dup3 |
| PTR sys_pipe2 |
| PTR sys_inotify_init1 |
| PTR sys_preadv /* 4330 */ |
| PTR sys_pwritev |
| PTR sys_rt_tgsigqueueinfo |
| PTR sys_perf_event_open |
| PTR sys_accept4 |
| PTR sys_recvmmsg /* 4335 */ |
| PTR sys_fanotify_init |
| PTR sys_fanotify_mark |
| PTR sys_prlimit64 |
| PTR sys_name_to_handle_at |
| PTR sys_open_by_handle_at /* 4340 */ |
| PTR sys_clock_adjtime |
| PTR sys_syncfs |
| PTR sys_sendmmsg |
| PTR sys_setns |
| PTR sys_process_vm_readv /* 4345 */ |
| PTR sys_process_vm_writev |
| PTR sys_kcmp |
| PTR sys_finit_module |
| PTR sys_sched_setattr |
| PTR sys_sched_getattr /* 4350 */ |
| PTR sys_renameat2 |
| PTR sys_seccomp |
| PTR sys_getrandom |
| PTR sys_memfd_create |
| PTR sys_bpf /* 4355 */ |
| PTR sys_execveat |
| PTR sys_userfaultfd |
| PTR sys_membarrier |
