160 lines
4.0 KiB
C
160 lines
4.0 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/binfmts.h>
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#include <linux/compat.h>
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#include <linux/mman.h>
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#include <linux/elf.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/sections.h>
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#include <arch/sim_def.h>
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/* Notify a running simulator, if any, that an exec just occurred. */
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static void sim_notify_exec(const char *binary_name)
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{
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unsigned char c;
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do {
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c = *binary_name++;
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__insn_mtspr(SPR_SIM_CONTROL,
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(SIM_CONTROL_OS_EXEC
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| (c << _SIM_CONTROL_OPERATOR_BITS)));
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} while (c);
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}
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static int notify_exec(void)
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{
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int retval = 0; /* failure */
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struct vm_area_struct *vma = current->mm->mmap;
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while (vma) {
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if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)
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break;
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vma = vma->vm_next;
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}
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if (vma) {
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char *buf = (char *) __get_free_page(GFP_KERNEL);
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if (buf) {
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char *path = d_path(&vma->vm_file->f_path,
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buf, PAGE_SIZE);
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if (!IS_ERR(path)) {
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sim_notify_exec(path);
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retval = 1;
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}
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free_page((unsigned long)buf);
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}
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}
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return retval;
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}
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/* Notify a running simulator, if any, that we loaded an interpreter. */
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static void sim_notify_interp(unsigned long load_addr)
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{
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size_t i;
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for (i = 0; i < sizeof(load_addr); i++) {
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unsigned char c = load_addr >> (i * 8);
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__insn_mtspr(SPR_SIM_CONTROL,
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(SIM_CONTROL_OS_INTERP
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| (c << _SIM_CONTROL_OPERATOR_BITS)));
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}
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}
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/* Kernel address of page used to map read-only kernel data into userspace. */
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static void *vdso_page;
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/* One-entry array used for install_special_mapping. */
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static struct page *vdso_pages[1];
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static int __init vdso_setup(void)
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{
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vdso_page = (void *)get_zeroed_page(GFP_ATOMIC);
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memcpy(vdso_page, __rt_sigreturn, __rt_sigreturn_end - __rt_sigreturn);
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vdso_pages[0] = virt_to_page(vdso_page);
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return 0;
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}
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device_initcall(vdso_setup);
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const char *arch_vma_name(struct vm_area_struct *vma)
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{
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if (vma->vm_private_data == vdso_pages)
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return "[vdso]";
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#ifndef __tilegx__
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if (vma->vm_start == MEM_USER_INTRPT)
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return "[intrpt]";
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#endif
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return NULL;
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}
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int arch_setup_additional_pages(struct linux_binprm *bprm,
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int executable_stack)
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{
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struct mm_struct *mm = current->mm;
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unsigned long vdso_base;
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int retval = 0;
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/*
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* Notify the simulator that an exec just occurred.
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* If we can't find the filename of the mapping, just use
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* whatever was passed as the linux_binprm filename.
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*/
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if (!notify_exec())
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sim_notify_exec(bprm->filename);
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down_write(&mm->mmap_sem);
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/*
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* MAYWRITE to allow gdb to COW and set breakpoints
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*/
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vdso_base = VDSO_BASE;
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retval = install_special_mapping(mm, vdso_base, PAGE_SIZE,
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VM_READ|VM_EXEC|
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VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
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vdso_pages);
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#ifndef __tilegx__
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/*
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* Set up a user-interrupt mapping here; the user can't
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* create one themselves since it is above TASK_SIZE.
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* We make it unwritable by default, so the model for adding
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* interrupt vectors always involves an mprotect.
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*/
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if (!retval) {
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unsigned long addr = MEM_USER_INTRPT;
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addr = mmap_region(NULL, addr, INTRPT_SIZE,
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MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE,
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VM_READ|VM_EXEC|
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VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, 0);
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if (addr > (unsigned long) -PAGE_SIZE)
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retval = (int) addr;
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}
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#endif
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up_write(&mm->mmap_sem);
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return retval;
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}
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void elf_plat_init(struct pt_regs *regs, unsigned long load_addr)
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{
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/* Zero all registers. */
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memset(regs, 0, sizeof(*regs));
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/* Report the interpreter's load address. */
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sim_notify_interp(load_addr);
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}
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