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1/*---------------------------------------------------------------------------+
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
19/* 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
34#define I387 (current->thread.fpu.state)
35#define FPU_info (I387->soft.info)
36
37#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)
43#define FPU_ORIG_EIP (FPU_info->___orig_eip)
44
45#define FPU_lookahead (I387->soft.lookahead)
46
47/* nz if ip_offset and cs_selector are not to be set for the current
48 instruction. */
49#define no_ip_update (*(u_char *)&(I387->soft.no_update))
50#define FPU_rm (*(u_char *)&(I387->soft.rm))
51
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. */
54#define access_limit (*(u_char *)&(I387->soft.alimit))
55
56#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)
61
62#define instruction_address (*(struct address *)&I387->soft.fip)
63#define operand_address (*(struct address *)&I387->soft.foo)
64
65#define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \
66 math_abort(FPU_info,SIGSEGV)
67#define FPU_abort math_abort(FPU_info, SIGSEGV)
68
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
1/*---------------------------------------------------------------------------+
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
19#include <asm/desc.h>
20#include <asm/mmu_context.h>
21
22static inline struct desc_struct FPU_get_ldt_descriptor(unsigned seg)
23{
24 static struct desc_struct zero_desc;
25 struct desc_struct ret = zero_desc;
26
27#ifdef CONFIG_MODIFY_LDT_SYSCALL
28 seg >>= 3;
29 mutex_lock(¤t->mm->context.lock);
30 if (current->mm->context.ldt && seg < current->mm->context.ldt->size)
31 ret = current->mm->context.ldt->entries[seg];
32 mutex_unlock(¤t->mm->context.lock);
33#endif
34 return ret;
35}
36
37#define SEG_D_SIZE(x) ((x).b & (3 << 21))
38#define SEG_G_BIT(x) ((x).b & (1 << 23))
39#define SEG_GRANULARITY(x) (((x).b & (1 << 23)) ? 4096 : 1)
40#define SEG_286_MODE(x) ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23)))
41#define SEG_BASE_ADDR(s) (((s).b & 0xff000000) \
42 | (((s).b & 0xff) << 16) | ((s).a >> 16))
43#define SEG_LIMIT(s) (((s).b & 0xff0000) | ((s).a & 0xffff))
44#define SEG_EXECUTE_ONLY(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11))
45#define SEG_WRITE_PERM(s) (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9))
46#define SEG_EXPAND_DOWN(s) (((s).b & ((1 << 11) | (1 << 10))) \
47 == (1 << 10))
48
49#define I387 (¤t->thread.fpu.state)
50#define FPU_info (I387->soft.info)
51
52#define FPU_CS (*(unsigned short *) &(FPU_info->regs->cs))
53#define FPU_SS (*(unsigned short *) &(FPU_info->regs->ss))
54#define FPU_DS (*(unsigned short *) &(FPU_info->regs->ds))
55#define FPU_EAX (FPU_info->regs->ax)
56#define FPU_EFLAGS (FPU_info->regs->flags)
57#define FPU_EIP (FPU_info->regs->ip)
58#define FPU_ORIG_EIP (FPU_info->___orig_eip)
59
60#define FPU_lookahead (I387->soft.lookahead)
61
62/* nz if ip_offset and cs_selector are not to be set for the current
63 instruction. */
64#define no_ip_update (*(u_char *)&(I387->soft.no_update))
65#define FPU_rm (*(u_char *)&(I387->soft.rm))
66
67/* Number of bytes of data which can be legally accessed by the current
68 instruction. This only needs to hold a number <= 108, so a byte will do. */
69#define access_limit (*(u_char *)&(I387->soft.alimit))
70
71#define partial_status (I387->soft.swd)
72#define control_word (I387->soft.cwd)
73#define fpu_tag_word (I387->soft.twd)
74#define registers (I387->soft.st_space)
75#define top (I387->soft.ftop)
76
77#define instruction_address (*(struct address *)&I387->soft.fip)
78#define operand_address (*(struct address *)&I387->soft.foo)
79
80#define FPU_access_ok(x,y,z) if ( !access_ok(x,y,z) ) \
81 math_abort(FPU_info,SIGSEGV)
82#define FPU_abort math_abort(FPU_info, SIGSEGV)
83
84#undef FPU_IGNORE_CODE_SEGV
85#ifdef FPU_IGNORE_CODE_SEGV
86/* access_ok() is very expensive, and causes the emulator to run
87 about 20% slower if applied to the code. Anyway, errors due to bad
88 code addresses should be much rarer than errors due to bad data
89 addresses. */
90#define FPU_code_access_ok(z)
91#else
92/* A simpler test than access_ok() can probably be done for
93 FPU_code_access_ok() because the only possible error is to step
94 past the upper boundary of a legal code area. */
95#define FPU_code_access_ok(z) FPU_access_ok(VERIFY_READ,(void __user *)FPU_EIP,z)
96#endif
97
98#define FPU_get_user(x,y) get_user((x),(y))
99#define FPU_put_user(x,y) put_user((x),(y))
100
101#endif