mirror of https://gitee.com/openkylin/linux.git
91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/*
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* Hexagon system calls
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*
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* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 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/linkage.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <linux/unistd.h>
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#include <asm/mman.h>
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#include <asm/registers.h>
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/*
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* System calls with architecture-specific wrappers.
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* See signal.c for signal-related system call wrappers.
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*/
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asmlinkage int sys_execve(char __user *ufilename,
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const char __user *const __user *argv,
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const char __user *const __user *envp)
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{
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struct pt_regs *pregs = current_thread_info()->regs;
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char *filename;
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int retval;
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filename = getname(ufilename);
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retval = PTR_ERR(filename);
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if (IS_ERR(filename))
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return retval;
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retval = do_execve(filename, argv, envp, pregs);
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putname(filename);
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return retval;
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}
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asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
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unsigned long parent_tidp, unsigned long child_tidp)
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{
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struct pt_regs *pregs = current_thread_info()->regs;
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if (!newsp)
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newsp = pregs->SP;
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return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp,
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(int __user *)child_tidp);
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}
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/*
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* Do a system call from the kernel, so as to have a proper pt_regs
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* and recycle the sys_execvpe infrustructure.
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*/
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int kernel_execve(const char *filename,
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const char *const argv[], const char *const envp[])
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{
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register unsigned long __a0 asm("r0") = (unsigned long) filename;
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register unsigned long __a1 asm("r1") = (unsigned long) argv;
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register unsigned long __a2 asm("r2") = (unsigned long) envp;
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int retval;
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__asm__ volatile(
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" R6 = #%4;\n"
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" trap0(#1);\n"
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" %0 = R0;\n"
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: "=r" (retval)
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: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
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);
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return retval;
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}
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EXPORT_SYMBOL(kernel_execve);
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