📄 scall64-o32.s
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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 - 2000, 2001 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, Inc. * Copyright (C) 2004 Thiemo Seufer * * 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 <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/thread_info.h>#include <asm/unistd.h>#include <asm/sysmips.h> .align 5NESTED(handle_sys, PT_SIZE, sp) .set noat SAVE_SOME TRACE_IRQS_ON_RELOAD STI .set at ld t1, PT_EPC(sp) # skip syscall on return dsubu t0, v0, __NR_O32_Linux # check syscall number sltiu t0, t0, __NR_O32_Linux_syscalls + 1 daddiu t1, 4 # skip to next instruction sd t1, PT_EPC(sp) beqz t0, not_o32_scall#if 0 SAVE_ALL move a1, v0 PRINT("Scall %ld\n") RESTORE_ALL#endif /* We don't want to stumble over broken sign extensions from userland. O32 does never use the upper half. */ sll a0, a0, 0 sll a1, a1, 0 sll a2, a2, 0 sll a3, a3, 0 dsll t0, v0, 3 # offset into table ld t2, (sys_call_table - (__NR_O32_Linux * 8))(t0) sd 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). * * 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. */ ld t0, PT_R29(sp) # get old user stack pointer daddu t1, t0, 32 bltz t1, bad_stack1: lw a4, 16(t0) # argument #5 from usp2: lw a5, 20(t0) # argument #6 from usp3: lw a6, 24(t0) # argument #7 from usp4: lw a7, 28(t0) # argument #8 from usp (for indirect syscalls) .section __ex_table,"a" PTR 1b, bad_stack PTR 2b, bad_stack PTR 3b, bad_stack PTR 4b, bad_stack .previous li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? and t0, t1, t0 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 dnegu v0 # error sd v0, PT_R0(sp) # flag for syscall restarting1: sd v0, PT_R2(sp) # resulto32_syscall_exit: local_irq_disable # make need_resched and # signals dont change between # sampling and return LONG_L a2, TI_FLAGS($28) li t0, _TIF_ALLWORK_MASK and t0, a2, t0 bnez t0, o32_syscall_exit_work j restore_partialo32_syscall_exit_work: j syscall_exit_work_partial/* ------------------------------------------------------------------------ */trace_a_syscall: SAVE_STATIC sd a4, PT_R8(sp) # Save argument registers sd a5, PT_R9(sp) sd a6, PT_R10(sp) sd a7, PT_R11(sp) # For indirect syscalls move s0, t2 # Save syscall pointer move a0, sp li a1, 0 jal do_syscall_trace move t0, s0 RESTORE_STATIC 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) ld a6, PT_R10(sp) ld a7, PT_R11(sp) # For indirect syscalls jalr t0 li t0, -EMAXERRNO - 1 # error? sltu t0, t0, v0 sd t0, PT_R7(sp) # set error flag beqz t0, 1f dnegu v0 # error sd v0, PT_R0(sp) # set flag for syscall restarting1: sd v0, PT_R2(sp) # result j syscall_exit/* ------------------------------------------------------------------------ */ /* * The stackpointer for a call with more than 4 arguments is bad. */bad_stack: dnegu v0 # error sd v0, PT_R0(sp) sd v0, PT_R2(sp) li t0, 1 # set error flag sd t0, PT_R7(sp) j o32_syscall_exitnot_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 END(handle_sys)LEAF(sys32_syscall) sltu v0, a0, __NR_O32_Linux + __NR_O32_Linux_syscalls + 1 beqz v0, einval dsll v0, a0, 3 ld t2, (sys_call_table - (__NR_O32_Linux * 8))(v0) li v1, 4000 # indirect syscall number beq a0, v1, einval # do not recurse move a0, a1 # shift argument registers move a1, a2 move a2, a3 move a3, a4 move a4, a5 move a5, a6 move a6, a7 sd a0, PT_R4(sp) # ... and push back a0 - a3, some sd a1, PT_R5(sp) # syscalls expect them there sd a2, PT_R6(sp) sd a3, PT_R7(sp) sd a3, PT_R26(sp) # update a3 for syscall restarting jr t2 /* Unreached */einval: li v0, -EINVAL jr ra END(sys32_syscall) .align 3 .type sys_call_table,@objectsys_call_table: PTR sys32_syscall /* 4000 */ PTR sys_exit PTR sys_fork PTR sys_read PTR sys_write PTR compat_sys_open /* 4005 */ PTR sys_close PTR sys_waitpid PTR sys_creat PTR sys_link PTR sys_unlink /* 4010 */ PTR sys32_execve PTR sys_chdir PTR compat_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 compat_sys_mount PTR sys_oldumount PTR sys_setuid PTR sys_getuid PTR compat_sys_stime /* 4025 */ PTR sys32_ptrace PTR sys_alarm PTR sys_ni_syscall /* was sys_fstat */ PTR sys_pause PTR compat_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 sys_pipe PTR compat_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 compat_sys_ioctl PTR compat_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 sys32_ustat PTR sys_dup2 PTR sys_getppid PTR sys_getpgrp /* 4065 */ PTR sys_setsid PTR sys32_sigaction PTR sys_sgetmask PTR sys_ssetmask PTR sys_setreuid /* 4070 */ PTR sys_setregid PTR sys32_sigsuspend PTR compat_sys_sigpending PTR sys_sethostname PTR compat_sys_setrlimit /* 4075 */ PTR compat_sys_getrlimit PTR compat_sys_getrusage PTR sys32_gettimeofday PTR sys32_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 compat_sys_old_readdir PTR old_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 compat_sys_statfs PTR compat_sys_fstatfs /* 4100 */ PTR sys_ni_syscall /* sys_ioperm */ PTR compat_sys_socketcall PTR sys_syslog PTR compat_sys_setitimer PTR compat_sys_getitimer /* 4105 */ PTR compat_sys_newstat PTR compat_sys_newlstat PTR compat_sys_newfstat PTR sys_uname PTR sys_ni_syscall /* sys_ioperm *//* 4110 */ PTR sys_vhangup PTR sys_ni_syscall /* was sys_idle */ PTR sys_ni_syscall /* sys_vm86 */ PTR compat_sys_wait4 PTR sys_swapoff /* 4115 */ PTR compat_sys_sysinfo PTR sys32_ipc PTR sys_fsync PTR sys32_sigreturn PTR sys32_clone /* 4120 */ PTR sys_setdomainname PTR sys32_newuname PTR sys_ni_syscall /* sys_modify_ldt */ PTR compat_sys_adjtimex PTR sys_mprotect /* 4125 */ PTR compat_sys_sigprocmask PTR sys_ni_syscall /* was creat_module */ PTR sys_init_module PTR sys_delete_module PTR sys_ni_syscall /* 4130, get_kernel_syms */ PTR sys_quotactl PTR sys_getpgid PTR sys_fchdir PTR sys_bdflush PTR sys_sysfs /* 4135 */ PTR sys32_personality PTR sys_ni_syscall /* for afs_syscall */ PTR sys_setfsuid PTR sys_setfsgid PTR sys32_llseek /* 4140 */ PTR compat_sys_getdents PTR compat_sys_select PTR sys_flock PTR sys_msync PTR compat_sys_readv /* 4145 */ PTR compat_sys_writev PTR sys_cacheflush PTR sys_cachectl PTR sys_sysmips PTR sys_ni_syscall /* 4150 */ PTR sys_getsid PTR sys_fdatasync PTR sys32_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 sys32_sched_rr_get_interval /* 4165 */ PTR compat_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 compat_sys_recvmsg PTR sys_send PTR compat_sys_sendmsg PTR sys_sendto /* 4180 */ PTR compat_sys_setsockopt PTR sys_shutdown PTR sys_socket PTR sys_socketpair PTR sys_setresuid /* 4185 */ PTR sys_getresuid PTR sys_ni_syscall /* was query_module */ PTR sys_poll PTR compat_sys_nfsservctl PTR sys_setresgid /* 4190 */ PTR sys_getresgid PTR sys_prctl PTR sys32_rt_sigreturn PTR sys32_rt_sigaction PTR sys32_rt_sigprocmask /* 4195 */ PTR sys32_rt_sigpending PTR compat_sys_rt_sigtimedwait PTR sys32_rt_sigqueueinfo PTR sys32_rt_sigsuspend PTR sys32_pread /* 4200 */ PTR sys32_pwrite PTR sys_chown PTR sys_getcwd PTR sys_capget PTR sys_capset /* 4205 */ PTR sys32_sigaltstack PTR sys32_sendfile PTR sys_ni_syscall PTR sys_ni_syscall PTR sys32_mmap2 /* 4210 */ PTR sys32_truncate64 PTR sys32_ftruncate64 PTR sys_newstat PTR sys_newlstat PTR sys_newfstat /* 4215 */ PTR sys_pivot_root PTR sys_mincore PTR sys_madvise PTR sys_getdents64 PTR compat_sys_fcntl64 /* 4220 */ PTR sys_ni_syscall PTR sys_gettid PTR sys32_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 compat_sys_futex PTR compat_sys_sched_setaffinity PTR compat_sys_sched_getaffinity /* 4240 */ 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 sys32_fadvise64_64 PTR compat_sys_statfs64 /* 4255 */ PTR compat_sys_fstatfs64 PTR compat_sys_timer_create PTR compat_sys_timer_settime PTR compat_sys_timer_gettime PTR sys_timer_getoverrun /* 4260 */ PTR sys_timer_delete PTR compat_sys_clock_settime PTR compat_sys_clock_gettime PTR compat_sys_clock_getres PTR compat_sys_clock_nanosleep /* 4265 */ PTR sys_tgkill PTR compat_sys_utimes PTR sys_ni_syscall /* sys_mbind */ PTR sys_ni_syscall /* sys_get_mempolicy */ PTR sys_ni_syscall /* 4270 sys_set_mempolicy */ PTR compat_sys_mq_open PTR sys_mq_unlink PTR compat_sys_mq_timedsend PTR compat_sys_mq_timedreceive PTR compat_sys_mq_notify /* 4275 */ PTR compat_sys_mq_getsetattr PTR sys_ni_syscall /* sys_vserver */ PTR sys32_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 compat_sys_openat PTR sys_mkdirat PTR sys_mknodat /* 4290 */ PTR sys_fchownat PTR compat_sys_futimesat PTR sys_newfstatat PTR sys_unlinkat PTR sys_renameat /* 4295 */ PTR sys_linkat PTR sys_symlinkat PTR sys_readlinkat PTR sys_fchmodat PTR sys_faccessat /* 4300 */ PTR compat_sys_pselect6 PTR sys_ppoll PTR sys_unshare PTR sys_splice PTR sys32_sync_file_range /* 4305 */ PTR sys_tee PTR sys_vmsplice PTR compat_sys_move_pages PTR compat_sys_set_robust_list PTR compat_sys_get_robust_list /* 4310 */ PTR compat_sys_kexec_load PTR sys_getcpu PTR compat_sys_epoll_pwait PTR sys_ioprio_set PTR sys_ioprio_get /* 4315 */ PTR compat_sys_utimensat PTR compat_sys_signalfd PTR compat_sys_timerfd PTR sys_eventfd PTR sys32_fallocate /* 4320 */ .size sys_call_table,.-sys_call_table⌨️ 快捷键说明
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