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