arch/um/kernel/exec.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   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/mm.h>
  11 #include <linux/sched/task.h>
  12 #include <linux/sched/task_stack.h>
  13 #include <linux/slab.h>
  14 #include <asm/current.h>
  15 #include <asm/processor.h>
  16 #include <linux/uaccess.h>
  17 #include <as-layout.h>
  18 #include <mem_user.h>
  19 #include <skas.h>
  20 #include <os.h>
  21
  22 void flush_thread(void)
  23 {
  24         void *data = NULL;
  25         int ret;
  26
  27         arch_flush_thread(&current->thread.arch);
  28
  29         ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
  30         ret = ret || unmap(&current->mm->context.id, STUB_END,
  31                            host_task_size - STUB_END, 1, &data);
  32         if (ret) {
  33                 printk(KERN_ERR "flush_thread - clearing address space failed, "
  34                        "err = %d\n", ret);
  35                 force_sig(SIGKILL);
  36         }
  37         get_safe_registers(current_pt_regs()->regs.gp,
  38                            current_pt_regs()->regs.fp);
  39
  40         __switch_mm(&current->mm->context.id);
  41 }
  42
  43 void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
  44 {
  45         PT_REGS_IP(regs) = eip;
  46         PT_REGS_SP(regs) = esp;
  47         current->ptrace &= ~PT_DTRACE;
  48 #ifdef SUBARCH_EXECVE1
  49         SUBARCH_EXECVE1(regs->regs);
  50 #endif
  51 }
  52 EXPORT_SYMBOL(start_thread);