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Linux/arch/arm64/kernel/sys.c

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  1 /*
  2  * AArch64-specific system calls implementation
  3  *
  4  * Copyright (C) 2012 ARM Ltd.
  5  * Author: Catalin Marinas <catalin.marinas@arm.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 18  */
 19 
 20 #include <linux/compiler.h>
 21 #include <linux/errno.h>
 22 #include <linux/fs.h>
 23 #include <linux/mm.h>
 24 #include <linux/export.h>
 25 #include <linux/sched.h>
 26 #include <linux/slab.h>
 27 #include <linux/syscalls.h>
 28 
 29 /*
 30  * Clone a task - this clones the calling program thread.
 31  */
 32 asmlinkage long sys_clone(unsigned long clone_flags, unsigned long newsp,
 33                           int __user *parent_tidptr, unsigned long tls_val,
 34                           int __user *child_tidptr, struct pt_regs *regs)
 35 {
 36         if (!newsp)
 37                 newsp = regs->sp;
 38         /* 16-byte aligned stack mandatory on AArch64 */
 39         if (newsp & 15)
 40                 return -EINVAL;
 41         return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr);
 42 }
 43 
 44 /*
 45  * sys_execve() executes a new program.
 46  */
 47 asmlinkage long sys_execve(const char __user *filenamei,
 48                            const char __user *const __user *argv,
 49                            const char __user *const __user *envp,
 50                            struct pt_regs *regs)
 51 {
 52         long error;
 53         struct filename *filename;
 54 
 55         filename = getname(filenamei);
 56         error = PTR_ERR(filename);
 57         if (IS_ERR(filename))
 58                 goto out;
 59         error = do_execve(filename->name, argv, envp, regs);
 60         putname(filename);
 61 out:
 62         return error;
 63 }
 64 
 65 int kernel_execve(const char *filename,
 66                   const char *const argv[],
 67                   const char *const envp[])
 68 {
 69         struct pt_regs regs;
 70         int ret;
 71 
 72         memset(&regs, 0, sizeof(struct pt_regs));
 73         ret = do_execve(filename,
 74                         (const char __user *const __user *)argv,
 75                         (const char __user *const __user *)envp, &regs);
 76         if (ret < 0)
 77                 goto out;
 78 
 79         /*
 80          * Save argc to the register structure for userspace.
 81          */
 82         regs.regs[0] = ret;
 83 
 84         /*
 85          * We were successful.  We won't be returning to our caller, but
 86          * instead to user space by manipulating the kernel stack.
 87          */
 88         asm(    "add    x0, %0, %1\n\t"
 89                 "mov    x1, %2\n\t"
 90                 "mov    x2, %3\n\t"
 91                 "bl     memmove\n\t"    /* copy regs to top of stack */
 92                 "mov    x27, #0\n\t"    /* not a syscall */
 93                 "mov    x28, %0\n\t"    /* thread structure */
 94                 "mov    sp, x0\n\t"     /* reposition stack pointer */
 95                 "b      ret_to_user"
 96                 :
 97                 : "r" (current_thread_info()),
 98                   "Ir" (THREAD_START_SP - sizeof(regs)),
 99                   "r" (&regs),
100                   "Ir" (sizeof(regs))
101                 : "x0", "x1", "x2", "x27", "x28", "x30", "memory");
102 
103  out:
104         return ret;
105 }
106 EXPORT_SYMBOL(kernel_execve);
107 
108 asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
109                          unsigned long prot, unsigned long flags,
110                          unsigned long fd, off_t off)
111 {
112         if (offset_in_page(off) != 0)
113                 return -EINVAL;
114 
115         return sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
116 }
117 
118 /*
119  * Wrappers to pass the pt_regs argument.
120  */
121 #define sys_execve              sys_execve_wrapper
122 #define sys_clone               sys_clone_wrapper
123 #define sys_rt_sigreturn        sys_rt_sigreturn_wrapper
124 #define sys_sigaltstack         sys_sigaltstack_wrapper
125 
126 #include <asm/syscalls.h>
127 
128 #undef __SYSCALL
129 #define __SYSCALL(nr, sym)      [nr] = sym,
130 
131 /*
132  * The sys_call_table array must be 4K aligned to be accessible from
133  * kernel/entry.S.
134  */
135 void *sys_call_table[__NR_syscalls] __aligned(4096) = {
136         [0 ... __NR_syscalls - 1] = sys_ni_syscall,
137 #include <asm/unistd.h>
138 };
139 

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