linux/arch/x86/include/asm/mpx.h

#ifndef _ASM_X86_MPX_H
#define _ASM_X86_MPX_H

#include <linux/types.h>
#include <asm/ptrace.h>

#ifdef CONFIG_X86_64

/* upper 28 bits [47:20] of the virtual address in 64-bit used to
 * index into bounds directory (BD).
 */
#define MPX_BD_ENTRY_OFFSET	28
#define MPX_BD_ENTRY_SHIFT	3
/* bits [19:3] of the virtual address in 64-bit used to index into
 * bounds table (BT).
 */
#define MPX_BT_ENTRY_OFFSET	17
#define MPX_BT_ENTRY_SHIFT	5
#define MPX_IGN_BITS		3

#else

#define MPX_BD_ENTRY_OFFSET	20
#define MPX_BD_ENTRY_SHIFT	2
#define MPX_BT_ENTRY_OFFSET	10
#define MPX_BT_ENTRY_SHIFT	4
#define MPX_IGN_BITS		2

#endif

#define MPX_BD_SIZE_BYTES (1UL<<(MPX_BD_ENTRY_OFFSET+MPX_BD_ENTRY_SHIFT))
#define MPX_BT_SIZE_BYTES (1UL<<(MPX_BT_ENTRY_OFFSET+MPX_BT_ENTRY_SHIFT))

#define MPX_BNDSTA_ERROR_CODE	0x3

#endif /* _ASM_X86_MPX_H */
x86, mpx: Add MPX-specific mmap interface We have chosen to perform the allocation of bounds tables in kernel (See the patch "on-demand kernel allocation of bounds tables") and to mark these VMAs with VM_MPX. However, there is currently no suitable interface to actually do this. Existing interfaces, like do_mmap_pgoff(), have no way to set a modified ->vm_ops or ->vm_flags and don't hold mmap_sem long enough to let a caller do it. This patch wraps mmap_region() and hold mmap_sem long enough to make the modifications to the VMA which we need. Also note the 32/64-bit #ifdef in the header. We actually need to do this at runtime eventually. But, for now, we don't support running 32-bit binaries on 64-bit kernels. Support for this will come in later patches. Signed-off-by: Qiaowei Ren <qiaowei.ren@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-mm@kvack.org Cc: linux-mips@linux-mips.org Cc: Dave Hansen <dave@sr71.net> Link: http://lkml.kernel.org/r/20141114151827.CE440F67@viggo.jf.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> 2014-11-14 15:18:27 +00:00			`#ifndef _ASM_X86_MPX_H`
			`#define _ASM_X86_MPX_H`

			`#include <linux/types.h>`
			`#include <asm/ptrace.h>`

			`#ifdef CONFIG_X86_64`

			`/* upper 28 bits [47:20] of the virtual address in 64-bit used to`
			`* index into bounds directory (BD).`
			`*/`
			`#define MPX_BD_ENTRY_OFFSET 28`
			`#define MPX_BD_ENTRY_SHIFT 3`
			`/* bits [19:3] of the virtual address in 64-bit used to index into`
			`* bounds table (BT).`
			`*/`
			`#define MPX_BT_ENTRY_OFFSET 17`
			`#define MPX_BT_ENTRY_SHIFT 5`
			`#define MPX_IGN_BITS 3`

			`#else`

			`#define MPX_BD_ENTRY_OFFSET 20`
			`#define MPX_BD_ENTRY_SHIFT 2`
			`#define MPX_BT_ENTRY_OFFSET 10`
			`#define MPX_BT_ENTRY_SHIFT 4`
			`#define MPX_IGN_BITS 2`

			`#endif`

			`#define MPX_BD_SIZE_BYTES (1UL<<(MPX_BD_ENTRY_OFFSET+MPX_BD_ENTRY_SHIFT))`
			`#define MPX_BT_SIZE_BYTES (1UL<<(MPX_BT_ENTRY_OFFSET+MPX_BT_ENTRY_SHIFT))`

			`#define MPX_BNDSTA_ERROR_CODE 0x3`

			`#endif /* _ASM_X86_MPX_H */`