cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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fpu_system.h (4538B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*---------------------------------------------------------------------------+
      3 |  fpu_system.h                                                             |
      4 |                                                                           |
      5 | Copyright (C) 1992,1994,1997                                              |
      6 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
      7 |                       Australia.  E-mail   billm@suburbia.net             |
      8 |                                                                           |
      9 +---------------------------------------------------------------------------*/
     10
     11#ifndef _FPU_SYSTEM_H
     12#define _FPU_SYSTEM_H
     13
     14/* system dependent definitions */
     15
     16#include <linux/sched.h>
     17#include <linux/kernel.h>
     18#include <linux/mm.h>
     19
     20#include <asm/desc.h>
     21#include <asm/mmu_context.h>
     22
     23static inline struct desc_struct FPU_get_ldt_descriptor(unsigned seg)
     24{
     25	static struct desc_struct zero_desc;
     26	struct desc_struct ret = zero_desc;
     27
     28#ifdef CONFIG_MODIFY_LDT_SYSCALL
     29	seg >>= 3;
     30	mutex_lock(&current->mm->context.lock);
     31	if (current->mm->context.ldt && seg < current->mm->context.ldt->nr_entries)
     32		ret = current->mm->context.ldt->entries[seg];
     33	mutex_unlock(&current->mm->context.lock);
     34#endif
     35	return ret;
     36}
     37
     38#define SEG_TYPE_WRITABLE	(1U << 1)
     39#define SEG_TYPE_EXPANDS_DOWN	(1U << 2)
     40#define SEG_TYPE_EXECUTE	(1U << 3)
     41#define SEG_TYPE_EXPAND_MASK	(SEG_TYPE_EXPANDS_DOWN | SEG_TYPE_EXECUTE)
     42#define SEG_TYPE_EXECUTE_MASK	(SEG_TYPE_WRITABLE | SEG_TYPE_EXECUTE)
     43
     44static inline unsigned long seg_get_base(struct desc_struct *d)
     45{
     46	unsigned long base = (unsigned long)d->base2 << 24;
     47
     48	return base | ((unsigned long)d->base1 << 16) | d->base0;
     49}
     50
     51static inline unsigned long seg_get_limit(struct desc_struct *d)
     52{
     53	return ((unsigned long)d->limit1 << 16) | d->limit0;
     54}
     55
     56static inline unsigned long seg_get_granularity(struct desc_struct *d)
     57{
     58	return d->g ? 4096 : 1;
     59}
     60
     61static inline bool seg_expands_down(struct desc_struct *d)
     62{
     63	return (d->type & SEG_TYPE_EXPAND_MASK) == SEG_TYPE_EXPANDS_DOWN;
     64}
     65
     66static inline bool seg_execute_only(struct desc_struct *d)
     67{
     68	return (d->type & SEG_TYPE_EXECUTE_MASK) == SEG_TYPE_EXECUTE;
     69}
     70
     71static inline bool seg_writable(struct desc_struct *d)
     72{
     73	return (d->type & SEG_TYPE_EXECUTE_MASK) == SEG_TYPE_WRITABLE;
     74}
     75
     76#define I387			(&current->thread.fpu.fpstate->regs)
     77#define FPU_info		(I387->soft.info)
     78
     79#define FPU_CS			(*(unsigned short *) &(FPU_info->regs->cs))
     80#define FPU_SS			(*(unsigned short *) &(FPU_info->regs->ss))
     81#define FPU_DS			(*(unsigned short *) &(FPU_info->regs->ds))
     82#define FPU_EAX			(FPU_info->regs->ax)
     83#define FPU_EFLAGS		(FPU_info->regs->flags)
     84#define FPU_EIP			(FPU_info->regs->ip)
     85#define FPU_ORIG_EIP		(FPU_info->___orig_eip)
     86
     87#define FPU_lookahead           (I387->soft.lookahead)
     88
     89/* nz if ip_offset and cs_selector are not to be set for the current
     90   instruction. */
     91#define no_ip_update		(*(u_char *)&(I387->soft.no_update))
     92#define FPU_rm			(*(u_char *)&(I387->soft.rm))
     93
     94/* Number of bytes of data which can be legally accessed by the current
     95   instruction. This only needs to hold a number <= 108, so a byte will do. */
     96#define access_limit		(*(u_char *)&(I387->soft.alimit))
     97
     98#define partial_status		(I387->soft.swd)
     99#define control_word		(I387->soft.cwd)
    100#define fpu_tag_word		(I387->soft.twd)
    101#define registers		(I387->soft.st_space)
    102#define top			(I387->soft.ftop)
    103
    104#define instruction_address	(*(struct address *)&I387->soft.fip)
    105#define operand_address		(*(struct address *)&I387->soft.foo)
    106
    107#define FPU_access_ok(y,z)	if ( !access_ok(y,z) ) \
    108				math_abort(FPU_info,SIGSEGV)
    109#define FPU_abort		math_abort(FPU_info, SIGSEGV)
    110#define FPU_copy_from_user(to, from, n)	\
    111		do { if (copy_from_user(to, from, n)) FPU_abort; } while (0)
    112
    113#undef FPU_IGNORE_CODE_SEGV
    114#ifdef FPU_IGNORE_CODE_SEGV
    115/* access_ok() is very expensive, and causes the emulator to run
    116   about 20% slower if applied to the code. Anyway, errors due to bad
    117   code addresses should be much rarer than errors due to bad data
    118   addresses. */
    119#define	FPU_code_access_ok(z)
    120#else
    121/* A simpler test than access_ok() can probably be done for
    122   FPU_code_access_ok() because the only possible error is to step
    123   past the upper boundary of a legal code area. */
    124#define	FPU_code_access_ok(z) FPU_access_ok((void __user *)FPU_EIP,z)
    125#endif
    126
    127#define FPU_get_user(x,y) do { if (get_user((x),(y))) FPU_abort; } while (0)
    128#define FPU_put_user(x,y) do { if (put_user((x),(y))) FPU_abort; } while (0)
    129
    130#endif