87 lines
1.6 KiB
C
87 lines
1.6 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/binfmts.h>
|
||
|
|
#include <linux/elf.h>
|
||
|
|
#include <linux/vmalloc.h>
|
||
|
|
#include <linux/unistd.h>
|
||
|
|
#include <linux/uaccess.h>
|
||
|
|
|
||
|
|
#include <asm/vdso.h>
|
||
|
|
#include <asm/cacheflush.h>
|
||
|
|
|
||
|
|
static struct page *vdso_page;
|
||
|
|
|
||
|
|
static int __init init_vdso(void)
|
||
|
|
{
|
||
|
|
struct csky_vdso *vdso;
|
||
|
|
int err = 0;
|
||
|
|
|
||
|
|
vdso_page = alloc_page(GFP_KERNEL);
|
||
|
|
if (!vdso_page)
|
||
|
|
panic("Cannot allocate vdso");
|
||
|
|
|
||
|
|
vdso = vmap(&vdso_page, 1, 0, PAGE_KERNEL);
|
||
|
|
if (!vdso)
|
||
|
|
panic("Cannot map vdso");
|
||
|
|
|
||
|
|
clear_page(vdso);
|
||
|
|
|
||
|
|
err = setup_vdso_page(vdso->rt_signal_retcode);
|
||
|
|
if (err)
|
||
|
|
panic("Cannot set signal return code, err: %x.", err);
|
||
|
|
|
||
|
|
dcache_wb_range((unsigned long)vdso, (unsigned long)vdso + 16);
|
||
|
|
|
||
|
|
vunmap(vdso);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
subsys_initcall(init_vdso);
|
||
|
|
|
||
|
|
int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
unsigned long addr;
|
||
|
|
struct mm_struct *mm = current->mm;
|
||
|
|
|
||
|
|
down_write(&mm->mmap_sem);
|
||
|
|
|
||
|
|
addr = get_unmapped_area(NULL, STACK_TOP, PAGE_SIZE, 0, 0);
|
||
|
|
if (IS_ERR_VALUE(addr)) {
|
||
|
|
ret = addr;
|
||
|
|
goto up_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = install_special_mapping(
|
||
|
|
mm,
|
||
|
|
addr,
|
||
|
|
PAGE_SIZE,
|
||
|
|
VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
|
||
|
|
&vdso_page);
|
||
|
|
if (ret)
|
||
|
|
goto up_fail;
|
||
|
|
|
||
|
|
mm->context.vdso = (void *)addr;
|
||
|
|
|
||
|
|
up_fail:
|
||
|
|
up_write(&mm->mmap_sem);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
const char *arch_vma_name(struct vm_area_struct *vma)
|
||
|
|
{
|
||
|
|
if (vma->vm_mm == NULL)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
if (vma->vm_start == (long)vma->vm_mm->context.vdso)
|
||
|
|
return "[vdso]";
|
||
|
|
else
|
||
|
|
return NULL;
|
||
|
|
}
|