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 62siginfo_t *mpx_generate_siginfo(struct pt_regs *regs, 63 struct xsave_struct *xsave_buf); 64int mpx_handle_bd_fault(struct xsave_struct *xsave_buf); 65static inline int kernel_managing_mpx_tables(struct mm_struct *mm) 66{ 67 return (mm->bd_addr != MPX_INVALID_BOUNDS_DIR); 68} 69static 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} 77void mpx_notify_unmap(struct mm_struct *mm, struct vm_area_struct *vma, 78 unsigned long start, unsigned long end); 79#else 80static inline siginfo_t *mpx_generate_siginfo(struct pt_regs *regs, 81 struct xsave_struct *xsave_buf) 82{ 83 return NULL; 84} 85static inline int mpx_handle_bd_fault(struct xsave_struct *xsave_buf) 86{ 87 return -EINVAL; 88} 89static inline int kernel_managing_mpx_tables(struct mm_struct *mm) 90{ 91 return 0; 92} 93static inline void mpx_mm_init(struct mm_struct *mm) 94{ 95} 96static 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 */ 104