scall32-o32.rar_Flavour

/* * 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 <[email protected]> * 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 sltiu t0, v0, __NR_O32_Linux_syscalls + 1 addiu t1, 4 # skip to next instruction sw t1, PT_EPC(sp) 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 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 1: user_lw(t5, 16(t0)) # argument #5 from usp 4: user_lw(t6, 20(t0)) # argument #6 from usp 3: user_lw(t7, 24(t0)) # argument #7 from usp 2: user_lw(t8, 28(t0)) # argument #8 from usp 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 1b,bad_stack PTR 2b,bad_stack PTR 3b,bad_stack PTR 4b,bad_stack .previous lw t0, TI_FLAGS($28) # syscall tracing enabled? li t1, _TIF_WORK_SYSCALL_ENTRY 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 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, t2 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, 2f # seccomp failed? Skip syscall 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 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 2: j syscall_exit /* ------------------------------------------------------------------------ */ /* * The stackpointer for a call with more than 4 arguments is bad. * 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 /* * 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 /* 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_