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143 lines
3.3 KiB
143 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Author: Huacai Chen <[email protected]> |
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited |
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*/ |
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#include <linux/binfmts.h> |
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#include <linux/elf.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/ioport.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/random.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/timekeeper_internal.h> |
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#include <asm/page.h> |
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#include <asm/vdso.h> |
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#include <vdso/helpers.h> |
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#include <vdso/vsyscall.h> |
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#include <generated/vdso-offsets.h> |
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extern char vdso_start[], vdso_end[]; |
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/* Kernel-provided data used by the VDSO. */ |
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static union { |
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u8 page[VDSO_DATA_SIZE]; |
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struct loongarch_vdso_data vdata; |
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} loongarch_vdso_data __page_aligned_data; |
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static struct page *vdso_pages[] = { NULL }; |
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struct vdso_data *vdso_data = loongarch_vdso_data.vdata.data; |
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struct vdso_pcpu_data *vdso_pdata = loongarch_vdso_data.vdata.pdata; |
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static int vdso_mremap(const struct vm_special_mapping *sm, struct vm_area_struct *new_vma) |
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{ |
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current->mm->context.vdso = (void *)(new_vma->vm_start); |
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return 0; |
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} |
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struct loongarch_vdso_info vdso_info = { |
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.vdso = vdso_start, |
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.size = PAGE_SIZE, |
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.code_mapping = { |
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.name = "[vdso]", |
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.pages = vdso_pages, |
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.mremap = vdso_mremap, |
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}, |
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.data_mapping = { |
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.name = "[vvar]", |
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}, |
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.offset_sigreturn = vdso_offset_sigreturn, |
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}; |
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static int __init init_vdso(void) |
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{ |
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unsigned long i, cpu, pfn; |
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BUG_ON(!PAGE_ALIGNED(vdso_info.vdso)); |
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BUG_ON(!PAGE_ALIGNED(vdso_info.size)); |
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for_each_possible_cpu(cpu) |
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vdso_pdata[cpu].node = cpu_to_node(cpu); |
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pfn = __phys_to_pfn(__pa_symbol(vdso_info.vdso)); |
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for (i = 0; i < vdso_info.size / PAGE_SIZE; i++) |
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vdso_info.code_mapping.pages[i] = pfn_to_page(pfn + i); |
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return 0; |
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} |
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subsys_initcall(init_vdso); |
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static unsigned long vdso_base(void) |
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{ |
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unsigned long base = STACK_TOP; |
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if (current->flags & PF_RANDOMIZE) { |
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base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1); |
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base = PAGE_ALIGN(base); |
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} |
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return base; |
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} |
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int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) |
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{ |
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int ret; |
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unsigned long vvar_size, size, data_addr, vdso_addr; |
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struct mm_struct *mm = current->mm; |
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struct vm_area_struct *vma; |
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struct loongarch_vdso_info *info = current->thread.vdso; |
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if (mmap_write_lock_killable(mm)) |
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return -EINTR; |
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/* |
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* Determine total area size. This includes the VDSO data itself |
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* and the data pages. |
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*/ |
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vvar_size = VDSO_DATA_SIZE; |
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size = vvar_size + info->size; |
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data_addr = get_unmapped_area(NULL, vdso_base(), size, 0, 0); |
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if (IS_ERR_VALUE(data_addr)) { |
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ret = data_addr; |
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goto out; |
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} |
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vdso_addr = data_addr + VDSO_DATA_SIZE; |
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vma = _install_special_mapping(mm, data_addr, vvar_size, |
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VM_READ | VM_MAYREAD, |
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&info->data_mapping); |
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if (IS_ERR(vma)) { |
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ret = PTR_ERR(vma); |
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goto out; |
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} |
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/* Map VDSO data page. */ |
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ret = remap_pfn_range(vma, data_addr, |
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virt_to_phys(&loongarch_vdso_data) >> PAGE_SHIFT, |
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vvar_size, PAGE_READONLY); |
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if (ret) |
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goto out; |
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/* Map VDSO code page. */ |
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vma = _install_special_mapping(mm, vdso_addr, info->size, |
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VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, |
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&info->code_mapping); |
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if (IS_ERR(vma)) { |
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ret = PTR_ERR(vma); |
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goto out; |
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} |
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mm->context.vdso = (void *)vdso_addr; |
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ret = 0; |
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out: |
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mmap_write_unlock(mm); |
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return ret; |
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}
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