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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> #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 #define LDT_DESCRIPTOR(s) (current->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->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) /* nz if ip_offset and cs_selector are not to be set for the current instruction. */ #define no_ip_update (((char *)&(I387.soft.twd))[0]) #define FPU_rm (((unsigned char *)&(I387.soft.twd))[1]) /* 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 (((unsigned char *)&(I387.soft.twd))[2]) #define partial_status (I387.soft.swd) #define control_word (I387.soft.cwd) #define regs (I387.soft.regs) #define top (I387.soft.top) #define instruction_address (*(struct address *)&I387.soft.fip) #define operand_address (*(struct address *)&I387.soft.foo) #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 #endif |