| Richard Kuo | b9398a8 | 2011-10-31 18:35:16 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Hexagon system calls |
| 3 | * |
| 4 | * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 and |
| 8 | * only version 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 18 | * 02110-1301, USA. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/file.h> |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/linkage.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/sched.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/syscalls.h> |
| 29 | #include <linux/unistd.h> |
| 30 | #include <asm/mman.h> |
| 31 | #include <asm/registers.h> |
| 32 | |
| 33 | /* |
| 34 | * System calls with architecture-specific wrappers. |
| 35 | * See signal.c for signal-related system call wrappers. |
| 36 | */ |
| 37 | |
| 38 | asmlinkage int sys_execve(char __user *ufilename, |
| 39 | const char __user *const __user *argv, |
| 40 | const char __user *const __user *envp) |
| 41 | { |
| 42 | struct pt_regs *pregs = current_thread_info()->regs; |
| 43 | char *filename; |
| 44 | int retval; |
| 45 | |
| 46 | filename = getname(ufilename); |
| 47 | retval = PTR_ERR(filename); |
| 48 | if (IS_ERR(filename)) |
| 49 | return retval; |
| 50 | |
| 51 | retval = do_execve(filename, argv, envp, pregs); |
| 52 | putname(filename); |
| 53 | |
| 54 | return retval; |
| 55 | } |
| 56 | |
| 57 | asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp, |
| 58 | unsigned long parent_tidp, unsigned long child_tidp) |
| 59 | { |
| 60 | struct pt_regs *pregs = current_thread_info()->regs; |
| 61 | |
| 62 | if (!newsp) |
| 63 | newsp = pregs->SP; |
| 64 | return do_fork(clone_flags, newsp, pregs, 0, (int __user *)parent_tidp, |
| 65 | (int __user *)child_tidp); |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Do a system call from the kernel, so as to have a proper pt_regs |
| 70 | * and recycle the sys_execvpe infrustructure. |
| 71 | */ |
| 72 | int kernel_execve(const char *filename, |
| 73 | const char *const argv[], const char *const envp[]) |
| 74 | { |
| 75 | register unsigned long __a0 asm("r0") = (unsigned long) filename; |
| 76 | register unsigned long __a1 asm("r1") = (unsigned long) argv; |
| 77 | register unsigned long __a2 asm("r2") = (unsigned long) envp; |
| 78 | int retval; |
| 79 | |
| 80 | __asm__ volatile( |
| 81 | " R6 = #%4;\n" |
| 82 | " trap0(#1);\n" |
| 83 | " %0 = R0;\n" |
| 84 | : "=r" (retval) |
| 85 | : "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve) |
| 86 | ); |
| 87 | |
| 88 | return retval; |
| 89 | } |
| 90 | EXPORT_SYMBOL(kernel_execve); |