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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_MPX_H
#define _ASM_X86_MPX_H
#include <linux/types.h>
#include <linux/mm_types.h>
#include <asm/ptrace.h>
#include <asm/insn.h>
/*
* NULL is theoretically a valid place to put the bounds
* directory, so point this at an invalid address.
*/
#define MPX_INVALID_BOUNDS_DIR ((void __user *)-1)
#define MPX_BNDCFG_ENABLE_FLAG 0x1
#define MPX_BD_ENTRY_VALID_FLAG 0x1
/*
* The upper 28 bits [47:20] of the virtual address in 64-bit
* are used to index into bounds directory (BD).
*
* The directory is 2G (2^31) in size, and with 8-byte entries
* it has 2^28 entries.
*/
#define MPX_BD_SIZE_BYTES_64 (1UL<<31)
#define MPX_BD_ENTRY_BYTES_64 8
#define MPX_BD_NR_ENTRIES_64 (MPX_BD_SIZE_BYTES_64/MPX_BD_ENTRY_BYTES_64)
/*
* The 32-bit directory is 4MB (2^22) in size, and with 4-byte
* entries it has 2^20 entries.
*/
#define MPX_BD_SIZE_BYTES_32 (1UL<<22)
#define MPX_BD_ENTRY_BYTES_32 4
#define MPX_BD_NR_ENTRIES_32 (MPX_BD_SIZE_BYTES_32/MPX_BD_ENTRY_BYTES_32)
/*
* A 64-bit table is 4MB total in size, and an entry is
* 4 64-bit pointers in size.
*/
#define MPX_BT_SIZE_BYTES_64 (1UL<<22)
#define MPX_BT_ENTRY_BYTES_64 32
#define MPX_BT_NR_ENTRIES_64 (MPX_BT_SIZE_BYTES_64/MPX_BT_ENTRY_BYTES_64)
/*
* A 32-bit table is 16kB total in size, and an entry is
* 4 32-bit pointers in size.
*/
#define MPX_BT_SIZE_BYTES_32 (1UL<<14)
#define MPX_BT_ENTRY_BYTES_32 16
#define MPX_BT_NR_ENTRIES_32 (MPX_BT_SIZE_BYTES_32/MPX_BT_ENTRY_BYTES_32)
#define MPX_BNDSTA_TAIL 2
#define MPX_BNDCFG_TAIL 12
#define MPX_BNDSTA_ADDR_MASK (~((1UL<<MPX_BNDSTA_TAIL)-1))
#define MPX_BNDCFG_ADDR_MASK (~((1UL<<MPX_BNDCFG_TAIL)-1))
#define MPX_BNDSTA_ERROR_CODE 0x3
struct mpx_fault_info {
void __user *addr;
void __user *lower;
void __user *upper;
};
#ifdef CONFIG_X86_INTEL_MPX
extern int mpx_fault_info(struct mpx_fault_info *info, struct pt_regs *regs);
extern int mpx_handle_bd_fault(void);
static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
{
return (mm->context.bd_addr != MPX_INVALID_BOUNDS_DIR);
}
static inline void mpx_mm_init(struct mm_struct *mm)
{
/*
* NULL is theoretically a valid place to put the bounds
* directory, so point this at an invalid address.
*/
mm->context.bd_addr = MPX_INVALID_BOUNDS_DIR;
}
extern void mpx_notify_unmap(struct mm_struct *mm, unsigned long start, unsigned long end);
extern unsigned long mpx_unmapped_area_check(unsigned long addr, unsigned long len, unsigned long flags);
#else
static inline int mpx_fault_info(struct mpx_fault_info *info, struct pt_regs *regs)
{
return -EINVAL;
}
static inline int mpx_handle_bd_fault(void)
{
return -EINVAL;
}
static inline int kernel_managing_mpx_tables(struct mm_struct *mm)
{
return 0;
}
static inline void mpx_mm_init(struct mm_struct *mm)
{
}
static inline void mpx_notify_unmap(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}
static inline unsigned long mpx_unmapped_area_check(unsigned long addr,
unsigned long len, unsigned long flags)
{
return addr;
}
#endif /* CONFIG_X86_INTEL_MPX */
#endif /* _ASM_X86_MPX_H */