/*---------------------------------------------------------------------------+ | fpu_system.h | | $Id: fpu_system.h,v 1.6 2003-03-02 23:59:09 cbothamy Exp $ | | | 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 #ifndef USE_WITH_CPU_SIM /* system dependent definitions */ #include #include #include /* 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) (((struct desc_struct *)current->mm->segments)[(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 (*(u16 *) &(FPU_info->___cs)) #define FPU_SS (*(u16 *) &(FPU_info->___ss)) #define FPU_DS (*(u16 *) &(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 SET_AX(val16) *(s16 *) &FPU_EAX = val16 /* 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.tos) #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 #define FPU_get_user(x,y) get_user((x),(y)) #define FPU_put_user(x,y) put_user((x),(y)) #else /* USE_WITH_CPU_SIM */ /* ----------------------------------------------------------- * Slimmed down version used to compile against a CPU simulator * rather than a kernel (ported by Kevin Lawton) * ------------------------------------------------------------ */ #include /* bbd: include ported linux headers after config.h for GCC_ATTRIBUTE macro */ #include #include #include #include #ifndef WORDS_BIGENDIAN #error "WORDS_BIGENDIAN not defined in config.h" #elif WORDS_BIGENDIAN == 1 #define EMU_BIG_ENDIAN 1 #else /* Nothing needed. Lack of defining EMU_BIG_ENDIAN means * small endian */ #endif extern unsigned fpu_get_user(void *ptr, unsigned len) BX_CPP_AttrRegparmN(2); extern void fpu_put_user(unsigned val, void *ptr, unsigned len) BX_CPP_AttrRegparmN(2); extern void fpu_verify_area(unsigned what, void *ptr, unsigned n) BX_CPP_AttrRegparmN(3); extern void math_emulate_init(void); extern unsigned fpu_get_ds(void); extern void fpu_set_ax(u16); #ifndef __ASSEMBLY__ struct info { #ifdef BX_NO_EMPTY_STRUCTS unsigned char donotindexme; #endif }; #define FPU_info ((struct info *) NULL) #endif #define SIGSEGV 11 extern i387_t *current_i387; #define i387 (*current_i387) #define I387 i387 #define SET_AX(val16) fpu_set_ax(val16); #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.tos) #define instruction_address (*(struct address *)&I387.soft.fip) #define operand_address (*(struct address *)&I387.soft.foo) #define FPU_verify_area(x,y,z) fpu_verify_area(x,y,z) #define FPU_get_user(x,y) ((x) = fpu_get_user((y), sizeof(*(y)))) #define FPU_put_user(val,ptr) fpu_put_user((val),(ptr),sizeof(*(ptr))) #define FPU_DS (fpu_get_ds()) #endif /* USE_WITH_CPU_SIM */ // bbd: Change a pointer to an int, with type conversions that make it legal. // First make it a void pointer, then convert to an integer of the same // size as the pointer. Otherwise, on machines with 64-bit pointers, // compilers complain when you typecast a 64-bit pointer into a 32-bit integer. #define PTR2INT(x) ((bx_ptr_equiv_t)(void *)(x)) // bbd: Change an int to a pointer, with type conversions that make it legal. // Same strategy as PTR2INT: change to bx_ptr_equiv_t which is an integer // type of the same size as FPU_REG*. Then the conversion to pointer // is legal. #define REGNO2PTR(x) ((FPU_REG*)((bx_ptr_equiv_t)(x))) #endif