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 get_safe_registers(regs->regs.gp, regs->regs.fp); 43 PT_REGS_IP(regs) = eip; 44 PT_REGS_SP(regs) = esp; 45 current->ptrace &= ~PT_DTRACE; 46 #ifdef SUBARCH_EXECVE1 47 SUBARCH_EXECVE1(regs->regs); 48 #endif 49 } 50 EXPORT_SYMBOL(start_thread); 51 52 long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __user *env) 53 { 54 long err; 55 56 err = do_execve(file, argv, env, ¤t->thread.regs); 57 if (!err) 58 UML_LONGJMP(current->thread.exec_buf, 1); 59 return err; 60 } 61 62 long sys_execve(const char __user *file, const char __user *const __user *argv, 63 const char __user *const __user *env) 64 { 65 long error; 66 char *filename; 67 68 filename = getname(file); 69 error = PTR_ERR(filename); 70 if (IS_ERR(filename)) goto out; 71 error = do_execve(filename, argv, env, ¤t->thread.regs); 72 putname(filename); 73 out: 74 return error; 75 } 76