arch/um/kernel/exec.c

   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/sched/task.h>
  12 #include <linux/slab.h>
  13 #include <asm/current.h>
  14 #include <asm/processor.h>
  15 #include <linux/uaccess.h>
  16 #include <as-layout.h>
  17 #include <mem_user.h>
  18 #include <skas.h>
  19 #include <os.h>
  20
  21 void flush_thread(void)
  22 {
  23         void *data = NULL;
  24         int ret;
  25
  26         arch_flush_thread(&current->thread.arch);
  27
  28         ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
  29         ret = ret || unmap(&current->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         get_safe_registers(current_pt_regs()->regs.gp,
  37                            current_pt_regs()->regs.fp);
  38
  39         __switch_mm(&current->mm->context.id);
  40 }
  41
  42 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
  43 {
  44         PT_REGS_IP(regs) = eip;
  45         PT_REGS_SP(regs) = esp;
  46         current->ptrace &= ~PT_DTRACE;
  47 #ifdef SUBARCH_EXECVE1
  48         SUBARCH_EXECVE1(regs->regs);
  49 #endif
  50 }
  51 EXPORT_SYMBOL(start_thread);