| /*---------------------------------------------------------------------------+ |
| | 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> |
| |
| #include <asm/desc.h> |
| #include <asm/mmu_context.h> |
| |
| static inline struct desc_struct FPU_get_ldt_descriptor(unsigned seg) |
| { |
| static struct desc_struct zero_desc; |
| struct desc_struct ret = zero_desc; |
| |
| #ifdef CONFIG_MODIFY_LDT_SYSCALL |
| seg >>= 3; |
| mutex_lock(¤t->mm->context.lock); |
| if (current->mm->context.ldt && seg < current->mm->context.ldt->size) |
| ret = current->mm->context.ldt->entries[seg]; |
| mutex_unlock(¤t->mm->context.lock); |
| #endif |
| return ret; |
| } |
| |
| #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.fpu.state) |
| #define FPU_info (I387->soft.info) |
| |
| #define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs)) |
| #define FPU_SS (*(unsigned short *) &(FPU_info->regs->ss)) |
| #define FPU_DS (*(unsigned short *) &(FPU_info->regs->ds)) |
| #define FPU_EAX (FPU_info->regs->ax) |
| #define FPU_EFLAGS (FPU_info->regs->flags) |
| #define FPU_EIP (FPU_info->regs->ip) |
| #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 |