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/*---------------------------------------------------------------------------+ | 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 |