/* * 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, 2001 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, 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 #include #include #include #include #include #include #include #include /* 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 ld t1, PT_EPC(sp) # skip syscall on return subu t0, v0, __NR_O32_Linux # check syscall number sltiu t0, t0, __NR_O32_Linux_syscalls + 1 daddiu t1, 4 # skip to next instruction beqz t0, not_o32_scall sd t1, PT_EPC(sp) #if 0 SAVE_ALL move a1, v0 PRINT("Scall %ld\n") RESTORE_ALL #endif /* XXX Put both in one cacheline, should save a bit. */ dsll t0, v0, 3 # offset into table ld t2, (sys_call_table - (__NR_O32_Linux * 8))(t0) lbu t3, (sys_narg_table - __NR_O32_Linux)(v0) 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) # flag for syscall restarting 1: sd v0, PT_R2(sp) # result FEXPORT(o32_ret_from_sys_call) mfc0 t0, CP0_STATUS # need_resched and signals atomic test ori t0, t0, 1 xori t0, t0, 1 mtc0 t0, CP0_STATUS SSNOP; SSNOP; SSNOP ld t2, TASK_NEED_RESCHED($28) bnez t2, o32_reschedule lw v0, TASK_SIGPENDING($28) bnez v0, signal_return restore_all: RESTORE_SOME RESTORE_SP .set mips3 eret .set mips0 signal_return: mfc0 t0, CP0_STATUS # need_resched and signals atomic test ori t0, t0, 1 mtc0 t0, CP0_STATUS move a0, zero move a1, sp SAVE_STATIC jal do_signal 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 PTR_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 */ .set push .set noreorder .set nomacro 1: lw a5, 20(t0) # argument #6 from usp 2: lw a4, 16(t0) # argument #5 from usp 3: .set pop 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 o32 compatibility syscall, pass it on to the 64-bit syscall handlers. */ #ifdef CONFIG_MIPS32_N32 j handle_sysn32 #else j handle_sys64 #endif 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) LEAF(mips_atomic_set) andi v0, a1, 3 # must be word aligned bnez v0, bad_alignment ld v1, THREAD_CURDS($28) # in legal address range? daddiu a0, a1, 4 or a0, a0, a1 and a0, a0, v1 bnez a0, bad_address /* Ok, this is the ll/sc case. World is sane :-) */ 1: ll v0, (a1) move a0, a2 2: sc a0, (a1) beqz a0, 1b .section __ex_table,"a" PTR 1b, bad_stack PTR 2b, bad_stack .previous 1: sd v0, PT_R2(sp) # result /* Success, so skip usual error handling garbage. */ ld t0, TASK_PTRACE($28) # syscall tracing enabled? andi t0, _PT_TRACESYS bnez t0, 1f b o32_ret_from_sys_call 1: SAVE_STATIC jal syscall_trace li a3, 0 # success j ret_from_sys_call bad_address: li v0, -EFAULT jr ra bad_alignment: li v0, -EINVAL jr ra END(mips_atomic_set) LEAF(sys32_sysmips) beq a0, MIPS_ATOMIC_SET, mips_atomic_set j sys_sysmips END(sys32_sysmips) LEAF(sys32_syscall) ld t0, PT_R29(sp) # user sp sltu v0, a0, __NR_Linux + __NR_Linux_syscalls + 1 beqz v0, enosys dsll v0, a0, 3 dla v1, sys32_syscall ld t2, (sys_call_table - (__NR_O32_Linux * 8))(v0) lbu t3, (sys_narg_table - __NR_O32_Linux)(a0) li v0, -EINVAL beq t2, v1, out # do not recurse beqz t2, enosys # null function pointer? andi v0, t0, 0x3 # unaligned stack pointer? bnez v0, sigsegv daddiu v0, t0, 16 # v0 = usp + 16 daddu t1, v0, 12 # 3 32-bit arguments ld v1, THREAD_CURDS($28) or v0, v0, t1 and v1, v1, v0 bnez v1, efault move a0, a1 # shift argument registers move a1, a2 move a2, a3 1: lw a3, 16(t0) 2: lw t3, 20(t0) 3: lw t1, 24(t0) .section __ex_table,"a" PTR 1b, efault PTR 2b, efault PTR 3b, efault .previous sw t3, 16(sp) # put into new stackframe sw t1, 20(sp) bnez t1, 1f # zero arguments? daddu a0, sp, 32 # then pass sp in a0 1: sw t3, 16(sp) sw v1, 20(sp) jr t2 /* Unreached */ enosys: li v0, -ENOSYS b out sigsegv: li a0, _SIGSEGV move a1, $28 jal force_sig /* Fall through */ efault: li v0, -EFAULT out: jr ra END(sys32_syscall) .macro syscalltable sys sys32_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_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 sys32_ptrace 4 sys sys32_alarm 1 sys sys_ni_syscall 0 /* was sys_fstat */ 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_ni_syscall 0 /* was sys_lstat */ 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 sys32_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 sys32_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 sys32_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 sys32_sendfile 4 sys sys_ni_syscall 0 sys sys_ni_syscall 0 sys sys32_mmap2 6 /* 4210 */ sys sys32_truncate64 4 sys sys32_ftruncate64 4 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 */ sys sys_ni_syscall 0 sys sys_gettid 0 sys sys32_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_ni_syscall, 0 /* res. for sendfile64 */ sys sys_ni_syscall, 0 /* res. for futex */ sys sys_ni_syscall, 0 /* res. for sched_setaffinity */ sys sys_ni_syscall, 0 /* 4240 res. for sched_getaffinity */ .endm .macro sys function, nargs PTR \function .endm .align 3 sys_call_table: syscalltable .macro sys function, nargs .byte \nargs .endm sys_narg_table: syscalltable