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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/x86/math-emu/fpu_system.h
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/*---------------------------------------------------------------------------+

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 |  fpu_system.h                                                             |

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 |                                                                           |

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 | Copyright (C) 1992,1994,1997                                              |

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 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |

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 |                       Australia.  E-mail   [email protected]             |

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 |                                                                           |

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 +---------------------------------------------------------------------------*/

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#ifndef _FPU_SYSTEM_H

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#define _FPU_SYSTEM_H

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/* system dependent definitions */

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#include <linux/sched.h>

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#include <linux/kernel.h>

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#include <linux/mm.h>

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/* s is always from a cpu register, and the cpu does bounds checking

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 * during register load --> no further bounds checks needed */

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#define LDT_DESCRIPTOR(s)	(((struct desc_struct *)current->mm->context.ldt)[(s) >> 3])

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#define SEG_D_SIZE(x)		((x).b & (3 << 21))

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#define SEG_G_BIT(x)		((x).b & (1 << 23))

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#define SEG_GRANULARITY(x)	(((x).b & (1 << 23)) ? 4096 : 1)

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#define SEG_286_MODE(x)		((x).b & ( 0xff000000 | 0xf0000 | (1 << 23)))

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#define SEG_BASE_ADDR(s)	(((s).b & 0xff000000) \

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				 | (((s).b & 0xff) << 16) | ((s).a >> 16))

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#define SEG_LIMIT(s)		(((s).b & 0xff0000) | ((s).a & 0xffff))

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#define SEG_EXECUTE_ONLY(s)	(((s).b & ((1 << 11) | (1 << 9))) == (1 << 11))

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#define SEG_WRITE_PERM(s)	(((s).b & ((1 << 11) | (1 << 9))) == (1 << 9))

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#define SEG_EXPAND_DOWN(s)	(((s).b & ((1 << 11) | (1 << 10))) \

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				 == (1 << 10))

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#define I387			(current->thread.fpu.state)

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#define FPU_info		(I387->soft.info)

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#define FPU_CS			(*(unsigned short *) &(FPU_info->regs->cs))

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#define FPU_SS			(*(unsigned short *) &(FPU_info->regs->ss))

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#define FPU_DS			(*(unsigned short *) &(FPU_info->regs->ds))

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#define FPU_EAX			(FPU_info->regs->ax)

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#define FPU_EFLAGS		(FPU_info->regs->flags)

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#define FPU_EIP			(FPU_info->regs->ip)

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#define FPU_ORIG_EIP		(FPU_info->___orig_eip)

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#define FPU_lookahead           (I387->soft.lookahead)

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/* nz if ip_offset and cs_selector are not to be set for the current

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   instruction. */

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#define no_ip_update		(*(u_char *)&(I387->soft.no_update))

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#define FPU_rm			(*(u_char *)&(I387->soft.rm))

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/* Number of bytes of data which can be legally accessed by the current

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   instruction. This only needs to hold a number <= 108, so a byte will do. */

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#define access_limit		(*(u_char *)&(I387->soft.alimit))

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#define partial_status		(I387->soft.swd)

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#define control_word		(I387->soft.cwd)

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#define fpu_tag_word		(I387->soft.twd)

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#define registers		(I387->soft.st_space)

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#define top			(I387->soft.ftop)

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#define instruction_address	(*(struct address *)&I387->soft.fip)

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#define operand_address		(*(struct address *)&I387->soft.foo)

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#define FPU_access_ok(x,y,z)	if ( !access_ok(x,y,z) ) \

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				math_abort(FPU_info,SIGSEGV)

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#define FPU_abort		math_abort(FPU_info, SIGSEGV)

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#undef FPU_IGNORE_CODE_SEGV

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#ifdef FPU_IGNORE_CODE_SEGV

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/* access_ok() is very expensive, and causes the emulator to run

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   about 20% slower if applied to the code. Anyway, errors due to bad

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   code addresses should be much rarer than errors due to bad data

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   addresses. */

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#define	FPU_code_access_ok(z)

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#else

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/* A simpler test than access_ok() can probably be done for

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   FPU_code_access_ok() because the only possible error is to step

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   past the upper boundary of a legal code area. */

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#define	FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)

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#endif

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#define FPU_get_user(x,y)       get_user((x),(y))

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#define FPU_put_user(x,y)       put_user((x),(y))

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#endif

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