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/module.h> 8 #include <linux/fs.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 PT_REGS_IP(regs) = eip; 43 PT_REGS_SP(regs) = esp; 44 } 45 EXPORT_SYMBOL(start_thread); 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, const char __user *const __user *argv, const char __user *const __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, const char __user *const __user *argv, 76 const char __user *const __user *env) 77 { 78 long error; 79 char *filename; 80 81 filename = getname(file); 82 error = PTR_ERR(filename); 83 if (IS_ERR(filename)) goto out; 84 error = execve1(filename, argv, env); 85 putname(filename); 86 out: 87 return error; 88 } 89