/*---------------------------------------------------------------------------+
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/*---------------------------------------------------------------------------+
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| fpu_system.h |
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| fpu_system.h |
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| Copyright (C) 1992,1994 |
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| Copyright (C) 1992,1994 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@vaxc.cc.monash.edu.au |
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| Australia. E-mail billm@vaxc.cc.monash.edu.au |
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+---------------------------------------------------------------------------*/
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+---------------------------------------------------------------------------*/
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#ifndef _FPU_SYSTEM_H
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#ifndef _FPU_SYSTEM_H
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#define _FPU_SYSTEM_H
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#define _FPU_SYSTEM_H
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/* system dependent definitions */
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/* system dependent definitions */
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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/* This sets the pointer FPU_info to point to the argument part
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/* This sets the pointer FPU_info to point to the argument part
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of the stack frame of math_emulate() */
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of the stack frame of math_emulate() */
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#define SETUP_DATA_AREA(arg) FPU_info = (struct info *) &arg
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#define SETUP_DATA_AREA(arg) FPU_info = (struct info *) &arg
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#define LDT_DESCRIPTOR(s) (current->ldt[(s) >> 3])
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#define LDT_DESCRIPTOR(s) (current->ldt[(s) >> 3])
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#define SEG_D_SIZE(x) ((x).b & (3 << 21))
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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_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_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_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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#define SEG_BASE_ADDR(s) (((s).b & 0xff000000) \
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| (((s).b & 0xff) << 16) | ((s).a >> 16))
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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_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_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_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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#define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \
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== (1 << 10))
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== (1 << 10))
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#define I387 (current->tss.i387)
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#define I387 (current->tss.i387)
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#define FPU_info (I387.soft.info)
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#define FPU_info (I387.soft.info)
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#define FPU_CS (*(unsigned short *) &(FPU_info->___cs))
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#define FPU_CS (*(unsigned short *) &(FPU_info->___cs))
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#define FPU_SS (*(unsigned short *) &(FPU_info->___ss))
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#define FPU_SS (*(unsigned short *) &(FPU_info->___ss))
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#define FPU_DS (*(unsigned short *) &(FPU_info->___ds))
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#define FPU_DS (*(unsigned short *) &(FPU_info->___ds))
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#define FPU_EAX (FPU_info->___eax)
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#define FPU_EAX (FPU_info->___eax)
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#define FPU_EFLAGS (FPU_info->___eflags)
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#define FPU_EFLAGS (FPU_info->___eflags)
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#define FPU_EIP (FPU_info->___eip)
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#define FPU_EIP (FPU_info->___eip)
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#define FPU_ORIG_EIP (FPU_info->___orig_eip)
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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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#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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/* nz if ip_offset and cs_selector are not to be set for the current
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instruction. */
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instruction. */
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#define no_ip_update (((char *)&(I387.soft.twd))[0])
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#define no_ip_update (((char *)&(I387.soft.twd))[0])
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#define FPU_rm (((unsigned char *)&(I387.soft.twd))[1])
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#define FPU_rm (((unsigned char *)&(I387.soft.twd))[1])
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/* Number of bytes of data which can be legally accessed by the current
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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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instruction. This only needs to hold a number <= 108, so a byte will do. */
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#define access_limit (((unsigned char *)&(I387.soft.twd))[2])
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#define access_limit (((unsigned char *)&(I387.soft.twd))[2])
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#define partial_status (I387.soft.swd)
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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 control_word (I387.soft.cwd)
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#define regs (I387.soft.regs)
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#define regs (I387.soft.regs)
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#define top (I387.soft.top)
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#define top (I387.soft.top)
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#define instruction_address (*(struct address *)&I387.soft.fip)
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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 operand_address (*(struct address *)&I387.soft.foo)
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#define FPU_verify_area(x,y,z) if ( verify_area(x,y,z) ) \
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#define FPU_verify_area(x,y,z) if ( verify_area(x,y,z) ) \
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math_abort(FPU_info,SIGSEGV)
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math_abort(FPU_info,SIGSEGV)
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#undef FPU_IGNORE_CODE_SEGV
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#undef FPU_IGNORE_CODE_SEGV
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#ifdef FPU_IGNORE_CODE_SEGV
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#ifdef FPU_IGNORE_CODE_SEGV
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/* verify_area() is very expensive, and causes the emulator to run
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/* verify_area() 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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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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code addresses should be much rarer than errors due to bad data
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addresses. */
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addresses. */
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#define FPU_code_verify_area(z)
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#define FPU_code_verify_area(z)
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#else
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#else
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/* A simpler test than verify_area() can probably be done for
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/* A simpler test than verify_area() can probably be done for
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FPU_code_verify_area() because the only possible error is to step
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FPU_code_verify_area() 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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past the upper boundary of a legal code area. */
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#define FPU_code_verify_area(z) FPU_verify_area(VERIFY_READ,(void *)FPU_EIP,z)
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#define FPU_code_verify_area(z) FPU_verify_area(VERIFY_READ,(void *)FPU_EIP,z)
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#endif
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#endif
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#endif
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#endif
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