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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*---------------------------------------------------------------------------+
2 | fpu_system.h |
3 | |
4 | Copyright (C) 1992,1994,1997 |
5 | W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
6 | Australia. E-mail billm@suburbia.net |
7 | |
8 +---------------------------------------------------------------------------*/
9
10#ifndef _FPU_SYSTEM_H
11#define _FPU_SYSTEM_H
12
13/* system dependent definitions */
14
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019/* s is always from a cpu register, and the cpu does bounds checking
20 * during register load --> no further bounds checks needed */
21#define LDT_DESCRIPTOR(s) (((struct desc_struct *)current->mm->context.ldt)[(s) >> 3])
22#define SEG_D_SIZE(x) ((x).b & (3 << 21))
23#define SEG_G_BIT(x) ((x).b & (1 << 23))
24#define SEG_GRANULARITY(x) (((x).b & (1 << 23)) ? 4096 : 1)
25#define SEG_286_MODE(x) ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23)))
26#define SEG_BASE_ADDR(s) (((s).b & 0xff000000) \
27 | (((s).b & 0xff) << 16) | ((s).a >> 16))
28#define SEG_LIMIT(s) (((s).b & 0xff0000) | ((s).a & 0xffff))
29#define SEG_EXECUTE_ONLY(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11))
30#define SEG_WRITE_PERM(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9))
31#define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \
32 == (1 << 10))
33
H. Peter Anvinc3f89782010-05-10 13:37:16 -070034#define I387 (current->thread.fpu.state)
Suresh Siddha61c46282008-03-10 15:28:04 -070035#define FPU_info (I387->soft.info)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Tejun Heod3157602009-02-09 22:17:39 +090037#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
38#define FPU_SS (*(unsigned short *) &(FPU_info->regs->ss))
39#define FPU_DS (*(unsigned short *) &(FPU_info->regs->ds))
40#define FPU_EAX (FPU_info->regs->ax)
41#define FPU_EFLAGS (FPU_info->regs->flags)
42#define FPU_EIP (FPU_info->regs->ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#define FPU_ORIG_EIP (FPU_info->___orig_eip)
44
Suresh Siddha61c46282008-03-10 15:28:04 -070045#define FPU_lookahead (I387->soft.lookahead)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47/* nz if ip_offset and cs_selector are not to be set for the current
48 instruction. */
Suresh Siddha61c46282008-03-10 15:28:04 -070049#define no_ip_update (*(u_char *)&(I387->soft.no_update))
50#define FPU_rm (*(u_char *)&(I387->soft.rm))
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/* Number of bytes of data which can be legally accessed by the current
53 instruction. This only needs to hold a number <= 108, so a byte will do. */
Suresh Siddha61c46282008-03-10 15:28:04 -070054#define access_limit (*(u_char *)&(I387->soft.alimit))
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Suresh Siddha61c46282008-03-10 15:28:04 -070056#define partial_status (I387->soft.swd)
57#define control_word (I387->soft.cwd)
58#define fpu_tag_word (I387->soft.twd)
59#define registers (I387->soft.st_space)
60#define top (I387->soft.ftop)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Suresh Siddha61c46282008-03-10 15:28:04 -070062#define instruction_address (*(struct address *)&I387->soft.fip)
63#define operand_address (*(struct address *)&I387->soft.foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65#define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \
66 math_abort(FPU_info,SIGSEGV)
Randy Dunlapd606f882006-12-07 02:14:00 +010067#define FPU_abort math_abort(FPU_info, SIGSEGV)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
69#undef FPU_IGNORE_CODE_SEGV
70#ifdef FPU_IGNORE_CODE_SEGV
71/* access_ok() is very expensive, and causes the emulator to run
72 about 20% slower if applied to the code. Anyway, errors due to bad
73 code addresses should be much rarer than errors due to bad data
74 addresses. */
75#define FPU_code_access_ok(z)
76#else
77/* A simpler test than access_ok() can probably be done for
78 FPU_code_access_ok() because the only possible error is to step
79 past the upper boundary of a legal code area. */
80#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)
81#endif
82
83#define FPU_get_user(x,y) get_user((x),(y))
84#define FPU_put_user(x,y) put_user((x),(y))
85
86#endif