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/*---------------------------------------------------------------------------+
| fpu_system.h |
| |
| Copyright (C) 1992,1994 |
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
| Australia. E-mail billm@vaxc.cc.monash.edu.au |
| |
+---------------------------------------------------------------------------*/
#ifndef _FPU_SYSTEM_H
#define _FPU_SYSTEM_H
/* system dependent definitions */
#include <linux/sched.h>
#include <linux/kernel.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
#define I387 (current->tss.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)
#define FPU_entry_eip (I387.soft.entry_eip)
#define partial_status (I387.soft.swd)
#define control_word (I387.soft.cwd)
#define regs (I387.soft.regs)
#define top (I387.soft.top)
#define ip_offset (I387.soft.fip)
#define cs_selector (I387.soft.fcs)
#define data_operand_offset (I387.soft.foo)
#define operand_selector (I387.soft.fos)
#define FPU_verify_area(x,y,z) if ( verify_area(x,y,z) ) \
math_abort(FPU_info,SIGSEGV)
#undef FPU_IGNORE_CODE_SEGV
#ifdef FPU_IGNORE_CODE_SEGV
/* verify_area() 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_verify_area(z)
#else
/* A simpler test than verify_area() can probably be done for
FPU_code_verify_area() because the only possible error is to step
past the upper boundary of a legal code area. */
#define FPU_code_verify_area(z) FPU_verify_area(VERIFY_READ,(void *)FPU_EIP,z)
#endif
/* ######## temporary and ugly ;-) */
#define FPU_data_address ((void *)(I387.soft.twd))
#endif