/* * 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, 1996, 1997, 2000, 2001, 05 by Ralf Baechle * Copyright (C) 1999, 2000 Silicon Graphics, Inc. * Copyright (C) 2001 MIPS Technologies, Inc. */ #include <linux/capability.h> #include <linux/errno.h> #include <linux/linkage.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/smp.h> #include <linux/mman.h> #include <linux/ptrace.h> #include <linux/sched.h> #include <linux/string.h> #include <linux/syscalls.h> #include <linux/file.h> #include <linux/slab.h> #include <linux/utsname.h> #include <linux/unistd.h> #include <linux/sem.h> #include <linux/msg.h> #include <linux/shm.h> #include <linux/compiler.h> #include <linux/module.h> #include <linux/ipc.h> #include <asm/branch.h> #include <asm/cachectl.h> #include <asm/cacheflush.h> #include <asm/asm-offsets.h> #include <asm/signal.h> #include <asm/sim.h> #include <asm/shmparam.h> #include <asm/sysmips.h> #include <asm/uaccess.h> /* * For historic reasons the pipe(2) syscall on MIPS has an unusual calling * convention. It returns results in registers $v0 / $v1 which means there * is no need for it to do verify the validity of a userspace pointer * argument. Historically that used to be expensive in Linux. These days * the performance advantage is negligible. */ asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs) { int fd[2]; int error, res; error = do_pipe_flags(fd, 0); if (error) { res = error; goto out; } regs.regs[3] = fd[1]; res = fd[0]; out: return res; } unsigned long shm_align_mask = PAGE_SIZE - 1; /* Sane caches */ EXPORT_SYMBOL(shm_align_mask); #define COLOUR_ALIGN(addr,pgoff) \ ((((addr) + shm_align_mask) & ~shm_align_mask) + \ (((pgoff) << PAGE_SHIFT) & shm_align_mask)) unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct vm_area_struct * vmm; int do_color_align; unsigned long task_size; task_size = STACK_TOP; if (len > task_size) return -ENOMEM; if (flags & MAP_FIXED) { /* Even MAP_FIXED mappings must reside within task_size. */ if (task_size - len < addr) return -EINVAL; /* * We do not accept a shared mapping if it would violate * cache aliasing constraints. */ if ((flags & MAP_SHARED) && (addr & shm_align_mask)) return -EINVAL; return addr; } do_color_align = 0; if (filp || (flags & MAP_SHARED)) do_color_align = 1; if (addr) { if (do_color_align) addr = COLOUR_ALIGN(addr, pgoff); else addr = PAGE_ALIGN(addr); vmm = find_vma(current->mm, addr); if (task_size - len >= addr && (!vmm || addr + len <= vmm->vm_start)) return addr; } addr = TASK_UNMAPPED_BASE; if (do_color_align) addr = COLOUR_ALIGN(addr, pgoff); else addr = PAGE_ALIGN(addr); for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { /* At this point: (!vmm || addr < vmm->vm_end). */ if (task_size - len < addr) return -ENOMEM; if (!vmm || addr + len <= vmm->vm_start) return addr; addr = vmm->vm_end; if (do_color_align) addr = COLOUR_ALIGN(addr, pgoff); } } /* common code for old and new mmaps */ static inline unsigned long do_mmap2(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff) { unsigned long error = -EBADF; struct file * file = NULL; flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } down_write(¤t->mm->mmap_sem); error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return error; } SYSCALL_DEFINE6(mips_mmap, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, off_t, offset) { unsigned long result; result = -EINVAL; if (offset & ~PAGE_MASK) goto out; result = do_mmap2(addr, len, prot, flags, fd, offset >> PAGE_SHIFT); out: return result; } SYSCALL_DEFINE6(mips_mmap2, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, unsigned long, pgoff) { if (pgoff & (~PAGE_MASK >> 12)) return -EINVAL; return do_mmap2(addr, len, prot, flags, fd, pgoff >> (PAGE_SHIFT-12)); } save_static_function(sys_fork); static int __used noinline _sys_fork(nabi_no_regargs struct pt_regs regs) { return do_fork(SIGCHLD, regs.regs[29], ®s, 0, NULL, NULL); } save_static_function(sys_clone); static int __used noinline _sys_clone(nabi_no_regargs struct pt_regs regs) { unsigned long clone_flags; unsigned long newsp; int __user *parent_tidptr, *child_tidptr; clone_flags = regs.regs[4]; newsp = regs.regs[5]; if (!newsp) newsp = regs.regs[29]; parent_tidptr = (int __user *) regs.regs[6]; #ifdef CONFIG_32BIT /* We need to fetch the fifth argument off the stack. */ child_tidptr = NULL; if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { int __user *__user *usp = (int __user *__user *) regs.regs[29]; if (regs.regs[2] == __NR_syscall) { if (get_user (child_tidptr, &usp[5])) return -EFAULT; } else if (get_user (child_tidptr, &usp[4])) return -EFAULT; } #else child_tidptr = (int __user *) regs.regs[8]; #endif return do_fork(clone_flags, newsp, ®s, 0, parent_tidptr, child_tidptr); } /* * sys_execve() executes a new program. */ asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs) { int error; char * filename; filename = getname((char __user *) (long)regs.regs[4]); error = PTR_ERR(filename); if (IS_ERR(filename)) goto out; error = do_execve(filename, (char __user *__user *) (long)regs.regs[5], (char __user *__user *) (long)regs.regs[6], ®s); putname(filename); out: return error; } /* * Compacrapability ... */ SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) { if (name && !copy_to_user(name, utsname(), sizeof (*name))) return 0; return -EFAULT; } /* * Compacrapability ... */ SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) { int error; if (!name) return -EFAULT; if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) return -EFAULT; error = __copy_to_user(&name->sysname, &utsname()->sysname, __OLD_UTS_LEN); error -= __put_user(0, name->sysname + __OLD_UTS_LEN); error -= __copy_to_user(&name->nodename, &utsname()->nodename, __OLD_UTS_LEN); error -= __put_user(0, name->nodename + __OLD_UTS_LEN); error -= __copy_to_user(&name->release, &utsname()->release, __OLD_UTS_LEN); error -= __put_user(0, name->release + __OLD_UTS_LEN); error -= __copy_to_user(&name->version, &utsname()->version, __OLD_UTS_LEN); error -= __put_user(0, name->version + __OLD_UTS_LEN); error -= __copy_to_user(&name->machine, &utsname()->machine, __OLD_UTS_LEN); error = __put_user(0, name->machine + __OLD_UTS_LEN); error = error ? -EFAULT : 0; return error; } SYSCALL_DEFINE1(set_thread_area, unsigned long, addr) { struct thread_info *ti = task_thread_info(current); ti->tp_value = addr; if (cpu_has_userlocal) write_c0_userlocal(addr); return 0; } asmlinkage int _sys_sysmips(long cmd, long arg1, long arg2, long arg3) { switch (cmd) { case MIPS_ATOMIC_SET: printk(KERN_CRIT "How did I get here?\n"); return -EINVAL; case MIPS_FIXADE: if (arg1 & ~3) return -EINVAL; if (arg1 & 1) set_thread_flag(TIF_FIXADE); else clear_thread_flag(TIF_FIXADE); if (arg1 & 2) set_thread_flag(TIF_LOGADE); else clear_thread_flag(TIF_FIXADE); return 0; case FLUSH_CACHE: __flush_cache_all(); return 0; } return -EINVAL; } /* * sys_ipc() is the de-multiplexer for the SysV IPC calls.. * * This is really horribly ugly. */ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, int, second, unsigned long, third, void __user *, ptr, long, fifth) { int version, ret; version = call >> 16; /* hack for backward compatibility */ call &= 0xffff; switch (call) { case SEMOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, NULL); case SEMTIMEDOP: return sys_semtimedop(first, (struct sembuf __user *)ptr, second, (const struct timespec __user *)fifth); case SEMGET: return sys_semget(first, second, third); case SEMCTL: { union semun fourth; if (!ptr) return -EINVAL; if (get_user(fourth.__pad, (void __user *__user *) ptr)) return -EFAULT; return sys_semctl(first, second, third, fourth); } case MSGSND: return sys_msgsnd(first, (struct msgbuf __user *) ptr, second, third); case MSGRCV: switch (version) { case 0: { struct ipc_kludge tmp; if (!ptr) return -EINVAL; if (copy_from_user(&tmp, (struct ipc_kludge __user *) ptr, sizeof(tmp))) return -EFAULT; return sys_msgrcv(first, tmp.msgp, second, tmp.msgtyp, third); } default: return sys_msgrcv(first, (struct msgbuf __user *) ptr, second, fifth, third); } case MSGGET: return sys_msgget((key_t) first, second); case MSGCTL: return sys_msgctl(first, second, (struct msqid_ds __user *) ptr); case SHMAT: switch (version) { default: { unsigned long raddr; ret = do_shmat(first, (char __user *) ptr, second, &raddr); if (ret) return ret; return put_user(raddr, (unsigned long __user *) third); } case 1: /* iBCS2 emulator entry point */ if (!segment_eq(get_fs(), get_ds())) return -EINVAL; return do_shmat(first, (char __user *) ptr, second, (unsigned long *) third); } case SHMDT: return sys_shmdt((char __user *)ptr); case SHMGET: return sys_shmget(first, second, third); case SHMCTL: return sys_shmctl(first, second, (struct shmid_ds __user *) ptr); default: return -ENOSYS; } } /* * No implemented yet ... */ SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op) { return -ENOSYS; } /* * If we ever come here the user sp is bad. Zap the process right away. * Due to the bad stack signaling wouldn't work. */ asmlinkage void bad_stack(void) { do_exit(SIGSEGV); } /* * Do a system call from kernel instead of calling sys_execve so we * end up with proper pt_regs. */ int kernel_execve(const char *filename, char *const argv[], char *const envp[]) { register unsigned long __a0 asm("$4") = (unsigned long) filename; register unsigned long __a1 asm("$5") = (unsigned long) argv; register unsigned long __a2 asm("$6") = (unsigned long) envp; register unsigned long __a3 asm("$7"); unsigned long __v0; __asm__ volatile (" \n" " .set noreorder \n" " li $2, %5 # __NR_execve \n" " syscall \n" " move %0, $2 \n" " .set reorder \n" : "=&r" (__v0), "=r" (__a3) : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) : "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24", "memory"); if (__a3 == 0) return __v0; return -__v0; }