diff options
Diffstat (limited to 'arch/score/kernel/sys_score.c')
| -rw-r--r-- | arch/score/kernel/sys_score.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/arch/score/kernel/sys_score.c b/arch/score/kernel/sys_score.c new file mode 100644 index 000000000000..6a60d1ee5330 --- /dev/null +++ b/arch/score/kernel/sys_score.c @@ -0,0 +1,147 @@ +/* + * arch/score/kernel/syscall.c + * + * Score Processor version. + * + * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. + * Chen Liqin <liqin.chen@sunplusct.com> + * Lennox Wu <lennox.wu@sunplusct.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/mman.h> +#include <linux/module.h> +#include <linux/unistd.h> + +unsigned long shm_align_mask = PAGE_SIZE - 1; +EXPORT_SYMBOL(shm_align_mask); + +asmlinkage unsigned long +sys_mmap2(unsigned long addr, unsigned long len, unsigned long prot, + unsigned long flags, unsigned long fd, unsigned long pgoff) +{ + int error = -EBADF; + struct file *file = NULL; + + if (pgoff & (~PAGE_MASK >> 12)) + return -EINVAL; + + flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); + if (!(flags & MAP_ANONYMOUS)) { + file = fget(fd); + if (!file) + return error; + } + + down_write(¤t->mm->mmap_sem); + error = do_mmap_pgoff(file, addr, len, prot, flags, + pgoff >> (PAGE_SHIFT - 12)); + up_write(¤t->mm->mmap_sem); + + if (file) + fput(file); + + return error; +} + +/* + * Clone a task - this clones the calling program thread. + * This is called indirectly via a small wrapper + */ +asmlinkage int +score_clone(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[0]; + parent_tidptr = (int __user *)regs->regs[6]; + + child_tidptr = NULL; + if (clone_flags & (CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)) { + int __user *__user *usp = (int __user *__user *)regs->regs[0]; + + if (get_user(child_tidptr, &usp[4])) + return -EFAULT; + } + + return do_fork(clone_flags, newsp, regs, 0, + parent_tidptr, child_tidptr); +} + +/* + * sys_execve() executes a new program. + * This is called indirectly via a small wrapper + */ +asmlinkage int score_execve(struct pt_regs *regs) +{ + int error; + char *filename; + + filename = getname((char *) (long) regs->regs[4]); + error = PTR_ERR(filename); + if (IS_ERR(filename)) + return error; + + error = do_execve(filename, (char **) (long) regs->regs[5], + (char **) (long) regs->regs[6], regs); + + putname(filename); + return error; +} + +/* + * 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 __r4 asm("r4") = (unsigned long) filename; + register unsigned long __r5 asm("r5") = (unsigned long) argv; + register unsigned long __r6 asm("r6") = (unsigned long) envp; + register unsigned long __r7 asm("r7"); + + __asm__ __volatile__ (" \n" + "ldi r27, %5 \n" + "syscall \n" + "mv %0, r4 \n" + "mv %1, r7 \n" + : "=&r" (__r4), "=r" (__r7) + : "r" (__r4), "r" (__r5), "r" (__r6), "i" (__NR_execve) + : "r8", "r9", "r10", "r11", "r22", "r23", "r24", "r25", + "r26", "r27", "memory"); + + if (__r7 == 0) + return __r4; + + return -__r4; +} |