da957e111b
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
91 lines
3.7 KiB
C
91 lines
3.7 KiB
C
/*---------------------------------------------------------------------------+
|
|
| fpu_system.h |
|
|
| |
|
|
| Copyright (C) 1992,1994,1997 |
|
|
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
|
|
| Australia. E-mail billm@suburbia.net |
|
|
| |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
#ifndef _FPU_SYSTEM_H
|
|
#define _FPU_SYSTEM_H
|
|
|
|
/* system dependent definitions */
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
|
|
/* This sets the pointer FPU_info to point to the argument part
|
|
of the stack frame of math_emulate() */
|
|
#define SETUP_DATA_AREA(arg) FPU_info = (struct info *) &arg
|
|
|
|
/* s is always from a cpu register, and the cpu does bounds checking
|
|
* during register load --> no further bounds checks needed */
|
|
#define LDT_DESCRIPTOR(s) (((struct desc_struct *)current->mm->context.ldt)[(s) >> 3])
|
|
#define SEG_D_SIZE(x) ((x).b & (3 << 21))
|
|
#define SEG_G_BIT(x) ((x).b & (1 << 23))
|
|
#define SEG_GRANULARITY(x) (((x).b & (1 << 23)) ? 4096 : 1)
|
|
#define SEG_286_MODE(x) ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23)))
|
|
#define SEG_BASE_ADDR(s) (((s).b & 0xff000000) \
|
|
| (((s).b & 0xff) << 16) | ((s).a >> 16))
|
|
#define SEG_LIMIT(s) (((s).b & 0xff0000) | ((s).a & 0xffff))
|
|
#define SEG_EXECUTE_ONLY(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11))
|
|
#define SEG_WRITE_PERM(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9))
|
|
#define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \
|
|
== (1 << 10))
|
|
|
|
#define I387 (current->thread.i387)
|
|
#define FPU_info (I387.soft.info)
|
|
|
|
#define FPU_CS (*(unsigned short *) &(FPU_info->___cs))
|
|
#define FPU_SS (*(unsigned short *) &(FPU_info->___ss))
|
|
#define FPU_DS (*(unsigned short *) &(FPU_info->___ds))
|
|
#define FPU_EAX (FPU_info->___eax)
|
|
#define FPU_EFLAGS (FPU_info->___eflags)
|
|
#define FPU_EIP (FPU_info->___eip)
|
|
#define FPU_ORIG_EIP (FPU_info->___orig_eip)
|
|
|
|
#define FPU_lookahead (I387.soft.lookahead)
|
|
|
|
/* nz if ip_offset and cs_selector are not to be set for the current
|
|
instruction. */
|
|
#define no_ip_update (*(u_char *)&(I387.soft.no_update))
|
|
#define FPU_rm (*(u_char *)&(I387.soft.rm))
|
|
|
|
/* Number of bytes of data which can be legally accessed by the current
|
|
instruction. This only needs to hold a number <= 108, so a byte will do. */
|
|
#define access_limit (*(u_char *)&(I387.soft.alimit))
|
|
|
|
#define partial_status (I387.soft.swd)
|
|
#define control_word (I387.soft.cwd)
|
|
#define fpu_tag_word (I387.soft.twd)
|
|
#define registers (I387.soft.st_space)
|
|
#define top (I387.soft.ftop)
|
|
|
|
#define instruction_address (*(struct address *)&I387.soft.fip)
|
|
#define operand_address (*(struct address *)&I387.soft.foo)
|
|
|
|
#define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \
|
|
math_abort(FPU_info,SIGSEGV)
|
|
#define FPU_abort math_abort(FPU_info, SIGSEGV)
|
|
|
|
#undef FPU_IGNORE_CODE_SEGV
|
|
#ifdef FPU_IGNORE_CODE_SEGV
|
|
/* access_ok() is very expensive, and causes the emulator to run
|
|
about 20% slower if applied to the code. Anyway, errors due to bad
|
|
code addresses should be much rarer than errors due to bad data
|
|
addresses. */
|
|
#define FPU_code_access_ok(z)
|
|
#else
|
|
/* A simpler test than access_ok() can probably be done for
|
|
FPU_code_access_ok() because the only possible error is to step
|
|
past the upper boundary of a legal code area. */
|
|
#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)
|
|
#endif
|
|
|
|
#define FPU_get_user(x,y) get_user((x),(y))
|
|
#define FPU_put_user(x,y) put_user((x),(y))
|
|
|
|
#endif
|