diff options
Diffstat (limited to 'arch/i386/kernel/sysenter.c')
| -rw-r--r-- | arch/i386/kernel/sysenter.c | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/arch/i386/kernel/sysenter.c b/arch/i386/kernel/sysenter.c deleted file mode 100644 index bc882a2b1db..00000000000 --- a/arch/i386/kernel/sysenter.c +++ /dev/null @@ -1,162 +0,0 @@ -/* - * linux/arch/i386/kernel/sysenter.c - * - * (C) Copyright 2002 Linus Torvalds - * Portions based on the vdso-randomization code from exec-shield: - * Copyright(C) 2005-2006, Red Hat, Inc., Ingo Molnar - * - * This file contains the needed initializations to support sysenter. - */ - -#include <linux/init.h> -#include <linux/smp.h> -#include <linux/thread_info.h> -#include <linux/sched.h> -#include <linux/gfp.h> -#include <linux/string.h> -#include <linux/elf.h> -#include <linux/mm.h> -#include <linux/module.h> - -#include <asm/cpufeature.h> -#include <asm/msr.h> -#include <asm/pgtable.h> -#include <asm/unistd.h> - -/* - * Should the kernel map a VDSO page into processes and pass its - * address down to glibc upon exec()? - */ -#ifdef CONFIG_PARAVIRT -unsigned int __read_mostly vdso_enabled = 0; -#else -unsigned int __read_mostly vdso_enabled = 1; -#endif - -EXPORT_SYMBOL_GPL(vdso_enabled); - -static int __init vdso_setup(char *s) -{ - vdso_enabled = simple_strtoul(s, NULL, 0); - - return 1; -} - -__setup("vdso=", vdso_setup); - -extern asmlinkage void sysenter_entry(void); - -void enable_sep_cpu(void) -{ - int cpu = get_cpu(); - struct tss_struct *tss = &per_cpu(init_tss, cpu); - - if (!boot_cpu_has(X86_FEATURE_SEP)) { - put_cpu(); - return; - } - - tss->ss1 = __KERNEL_CS; - tss->esp1 = sizeof(struct tss_struct) + (unsigned long) tss; - wrmsr(MSR_IA32_SYSENTER_CS, __KERNEL_CS, 0); - wrmsr(MSR_IA32_SYSENTER_ESP, tss->esp1, 0); - wrmsr(MSR_IA32_SYSENTER_EIP, (unsigned long) sysenter_entry, 0); - put_cpu(); -} - -/* - * These symbols are defined by vsyscall.o to mark the bounds - * of the ELF DSO images included therein. - */ -extern const char vsyscall_int80_start, vsyscall_int80_end; -extern const char vsyscall_sysenter_start, vsyscall_sysenter_end; -static struct page *syscall_pages[1]; - -int __init sysenter_setup(void) -{ - void *syscall_page = (void *)get_zeroed_page(GFP_ATOMIC); - syscall_pages[0] = virt_to_page(syscall_page); - -#ifdef CONFIG_COMPAT_VDSO - __set_fixmap(FIX_VDSO, __pa(syscall_page), PAGE_READONLY); - printk("Compat vDSO mapped to %08lx.\n", __fix_to_virt(FIX_VDSO)); -#endif - - if (!boot_cpu_has(X86_FEATURE_SEP)) { - memcpy(syscall_page, - &vsyscall_int80_start, - &vsyscall_int80_end - &vsyscall_int80_start); - return 0; - } - - memcpy(syscall_page, - &vsyscall_sysenter_start, - &vsyscall_sysenter_end - &vsyscall_sysenter_start); - - return 0; -} - -#ifndef CONFIG_COMPAT_VDSO -/* Defined in vsyscall-sysenter.S */ -extern void SYSENTER_RETURN; - -/* Setup a VMA at program startup for the vsyscall page */ -int arch_setup_additional_pages(struct linux_binprm *bprm, int exstack) -{ - struct mm_struct *mm = current->mm; - unsigned long addr; - int ret; - - down_write(&mm->mmap_sem); - addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0); - if (IS_ERR_VALUE(addr)) { - ret = addr; - goto up_fail; - } - - /* - * MAYWRITE to allow gdb to COW and set breakpoints - * - * Make sure the vDSO gets into every core dump. - * Dumping its contents makes post-mortem fully interpretable later - * without matching up the same kernel and hardware config to see - * what PC values meant. - */ - ret = install_special_mapping(mm, addr, PAGE_SIZE, - VM_READ|VM_EXEC| - VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC| - VM_ALWAYSDUMP, - syscall_pages); - if (ret) - goto up_fail; - - current->mm->context.vdso = (void *)addr; - current_thread_info()->sysenter_return = - (void *)VDSO_SYM(&SYSENTER_RETURN); -up_fail: - up_write(&mm->mmap_sem); - return ret; -} - -const char *arch_vma_name(struct vm_area_struct *vma) -{ - if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso) - return "[vdso]"; - return NULL; -} - -struct vm_area_struct *get_gate_vma(struct task_struct *tsk) -{ - return NULL; -} - -int in_gate_area(struct task_struct *task, unsigned long addr) -{ - return 0; -} - -int in_gate_area_no_task(unsigned long addr) -{ - return 0; -} -#endif |