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