1 // SPDX-License-Identifier: GPL-2.0
4  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
13 #include <as-layout.h>
17 static int init_stub_pte(struct mm_struct *mm, unsigned long proc,  in init_stub_pte()  argument
26 	pgd = pgd_offset(mm, proc);  in init_stub_pte()
28 	p4d = p4d_alloc(mm, pgd, proc);  in init_stub_pte()
32 	pud = pud_alloc(mm, p4d, proc);  in init_stub_pte()
36 	pmd = pmd_alloc(mm, pud, proc);  in init_stub_pte()
40 	pte = pte_alloc_map(mm, pmd, proc);  in init_stub_pte()
55 	return -ENOMEM;  in init_stub_pte()
61 	struct mm_context *to_mm = &mm->context;  in init_new_context()
63 	int ret = -ENOMEM;  in init_new_context()
69 	to_mm->id.stack = stack;  in init_new_context()
70 	if (current->mm != NULL && current->mm != &init_mm)  in init_new_context()
71 		from_mm = &current->mm->context;  in init_new_context()
75 		to_mm->id.u.pid = copy_context_skas0(stack,  in init_new_context()
76 						     from_mm->id.u.pid);  in init_new_context()
77 	else to_mm->id.u.pid = start_userspace(stack);  in init_new_context()
80 	if (to_mm->id.u.pid < 0) {  in init_new_context()
81 		ret = to_mm->id.u.pid;  in init_new_context()
87 		printk(KERN_ERR "init_new_context_skas - init_ldt"  in init_new_context()
95 	if (to_mm->id.stack != 0)  in init_new_context()
96 		free_page(to_mm->id.stack);  in init_new_context()
110 	ret = init_stub_pte(mm, STUB_DATA, mm->context.id.stack);  in uml_setup_stubs()
114 	mm->context.stub_pages[0] = virt_to_page(__syscall_stub_start);  in uml_setup_stubs()
115 	mm->context.stub_pages[1] = virt_to_page(mm->context.id.stack);  in uml_setup_stubs()
118 	err = install_special_mapping(mm, STUB_START, STUB_END - STUB_START,  in uml_setup_stubs()
121 				      mm->context.stub_pages);  in uml_setup_stubs()
149 	struct mm_context *mmu = &mm->context;  in destroy_context()
157 	if (mmu->id.u.pid < 2) {  in destroy_context()
158 		printk(KERN_ERR "corrupt mm_context - pid = %d\n",  in destroy_context()
159 		       mmu->id.u.pid);  in destroy_context()
162 	os_kill_ptraced_process(mmu->id.u.pid, 1);  in destroy_context()
164 	free_page(mmu->id.stack);  in destroy_context()