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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
-