arch/x86/include/asm/mpx.h

   1 #ifndef _ASM_X86_MPX_H
   2 #define _ASM_X86_MPX_H
   3
   4 #include <linux/types.h>
   5 #include <asm/ptrace.h>
   6 #include <asm/insn.h>
   7
   8 /*
   9  * NULL is theoretically a valid place to put the bounds
  10  * directory, so point this at an invalid address.
  11  */
  12 #define MPX_INVALID_BOUNDS_DIR  ((void __user *)-1)
  13 #define MPX_BNDCFG_ENABLE_FLAG  0x1
  14 #define MPX_BD_ENTRY_VALID_FLAG 0x1
  15
  16 #ifdef CONFIG_X86_64
  17
  18 /* upper 28 bits [47:20] of the virtual address in 64-bit used to
  19  * index into bounds directory (BD).
  20  */
  21 #define MPX_BD_ENTRY_OFFSET     28
  22 #define MPX_BD_ENTRY_SHIFT      3
  23 /* bits [19:3] of the virtual address in 64-bit used to index into
  24  * bounds table (BT).
  25  */
  26 #define MPX_BT_ENTRY_OFFSET     17
  27 #define MPX_BT_ENTRY_SHIFT      5
  28 #define MPX_IGN_BITS            3
  29 #define MPX_BD_ENTRY_TAIL       3
  30
  31 #else
  32
  33 #define MPX_BD_ENTRY_OFFSET     20
  34 #define MPX_BD_ENTRY_SHIFT      2
  35 #define MPX_BT_ENTRY_OFFSET     10
  36 #define MPX_BT_ENTRY_SHIFT      4
  37 #define MPX_IGN_BITS            2
  38 #define MPX_BD_ENTRY_TAIL       2
  39
  40 #endif
  41
  42 #define MPX_BD_SIZE_BYTES (1UL<<(MPX_BD_ENTRY_OFFSET+MPX_BD_ENTRY_SHIFT))
  43 #define MPX_BT_SIZE_BYTES (1UL<<(MPX_BT_ENTRY_OFFSET+MPX_BT_ENTRY_SHIFT))
  44
  45 #define MPX_BNDSTA_TAIL         2
  46 #define MPX_BNDCFG_TAIL         12
  47 #define MPX_BNDSTA_ADDR_MASK    (~((1UL<<MPX_BNDSTA_TAIL)-1))
  48 #define MPX_BNDCFG_ADDR_MASK    (~((1UL<<MPX_BNDCFG_TAIL)-1))
  49 #define MPX_BT_ADDR_MASK        (~((1UL<<MPX_BD_ENTRY_TAIL)-1))
  50
  51 #define MPX_BNDCFG_ADDR_MASK    (~((1UL<<MPX_BNDCFG_TAIL)-1))
  52 #define MPX_BNDSTA_ERROR_CODE   0x3
  53
  54 #define MPX_BD_ENTRY_MASK       ((1<<MPX_BD_ENTRY_OFFSET)-1)
  55 #define MPX_BT_ENTRY_MASK       ((1<<MPX_BT_ENTRY_OFFSET)-1)
  56 #define MPX_GET_BD_ENTRY_OFFSET(addr)   ((((addr)>>(MPX_BT_ENTRY_OFFSET+ \
  57                 MPX_IGN_BITS)) & MPX_BD_ENTRY_MASK) << MPX_BD_ENTRY_SHIFT)
  58 #define MPX_GET_BT_ENTRY_OFFSET(addr)   ((((addr)>>MPX_IGN_BITS) & \
  59                 MPX_BT_ENTRY_MASK) << MPX_BT_ENTRY_SHIFT)
  60
  61 #ifdef CONFIG_X86_INTEL_MPX
  62 siginfo_t *mpx_generate_siginfo(struct pt_regs *regs,
  63                                 struct xsave_struct *xsave_buf);
  64 int mpx_handle_bd_fault(struct xsave_struct *xsave_buf);
  65 static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
  66 {
  67         return (mm->bd_addr != MPX_INVALID_BOUNDS_DIR);
  68 }
  69 static inline void mpx_mm_init(struct mm_struct *mm)
  70 {
  71         /*
  72          * NULL is theoretically a valid place to put the bounds
  73          * directory, so point this at an invalid address.
  74          */
  75         mm->bd_addr = MPX_INVALID_BOUNDS_DIR;
  76 }
  77 void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma,
  78                       unsigned long start, unsigned long end);
  79 #else
  80 static inline siginfo_t *mpx_generate_siginfo(struct pt_regs *regs,
  81                                               struct xsave_struct *xsave_buf)
  82 {
  83         return NULL;
  84 }
  85 static inline int mpx_handle_bd_fault(struct xsave_struct *xsave_buf)
  86 {
  87         return -EINVAL;
  88 }
  89 static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
  90 {
  91         return 0;
  92 }
  93 static inline void mpx_mm_init(struct mm_struct *mm)
  94 {
  95 }
  96 static inline void mpx_notify_unmap(struct mm_struct *mm,
  97                                     struct vm_area_struct *vma,
  98                                     unsigned long start, unsigned long end)
  99 {
 100 }
 101 #endif /* CONFIG_X86_INTEL_MPX */
 102
 103 #endif /* _ASM_X86_MPX_H */