1 /* 2 * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) 3 * Licensed under the GPL 4 */ 5 6 #include "linux/stddef.h" 7 #include "linux/fs.h" 8 #include "linux/smp_lock.h" 9 #include "linux/ptrace.h" 10 #include "linux/sched.h" 11 #include "linux/slab.h" 12 #include "asm/current.h" 13 #include "asm/processor.h" 14 #include "asm/uaccess.h" 15 #include "as-layout.h" 16 #include "mem_user.h" 17 #include "skas.h" 18 #include "os.h" 19 #include "internal.h" 20 21 void flush_thread(void) 22 { 23 void *data = NULL; 24 int ret; 25 26 arch_flush_thread(¤t->thread.arch); 27 28 ret = unmap(¤t->mm->context.id, 0, STUB_START, 0, &data); 29 ret = ret || unmap(¤t->mm->context.id, STUB_END, 30 host_task_size - STUB_END, 1, &data); 31 if (ret) { 32 printk(KERN_ERR "flush_thread - clearing address space failed, " 33 "err = %d\n", ret); 34 force_sig(SIGKILL, current); 35 } 36 37 __switch_mm(¤t->mm->context.id); 38 } 39 40 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp) 41 { 42 set_fs(USER_DS); 43 PT_REGS_IP(regs) = eip; 44 PT_REGS_SP(regs) = esp; 45 } 46 47 static long execve1(const char *file, 48 const char __user *const __user *argv, 49 const char __user *const __user *env) 50 { 51 long error; 52 53 error = do_execve(file, argv, env, ¤t->thread.regs); 54 if (error == 0) { 55 task_lock(current); 56 current->ptrace &= ~PT_DTRACE; 57 #ifdef SUBARCH_EXECVE1 58 SUBARCH_EXECVE1(¤t->thread.regs.regs); 59 #endif 60 task_unlock(current); 61 } 62 return error; 63 } 64 65 long um_execve(const char *file, char __user *__user *argv, char __user *__user *env) 66 { 67 long err; 68 69 err = execve1(file, argv, env); 70 if (!err) 71 UML_LONGJMP(current->thread.exec_buf, 1); 72 return err; 73 } 74 75 long sys_execve(const char __user *file, char __user *__user *argv, 76 char __user *__user *env) 77 { 78 long error; 79 char *filename; 80 81 lock_kernel(); 82 filename = getname(file); 83 error = PTR_ERR(filename); 84 if (IS_ERR(filename)) goto out; 85 error = execve1(filename, argv, env); 86 putname(filename); 87 out: 88 unlock_kernel(); 89 return error; 90 } 91