diff options
Diffstat (limited to 'target/linux/realtek/files/arch/rlx/kernel/syscall.c')
| -rw-r--r-- | target/linux/realtek/files/arch/rlx/kernel/syscall.c | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/target/linux/realtek/files/arch/rlx/kernel/syscall.c b/target/linux/realtek/files/arch/rlx/kernel/syscall.c new file mode 100644 index 000000000..edba10ec3 --- /dev/null +++ b/target/linux/realtek/files/arch/rlx/kernel/syscall.c @@ -0,0 +1,450 @@ +/* + * 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]; + + /* 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; + } + + 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; + 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; +} |