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