| 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 | } |